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Electrical and Electronics Engineering publications abstract of: 09-2011 sorted by title, page: 0
» “Trends” Expert Overview Sessions Revived at ICASSP 2011 [In the Spotlight]
Abstract:
The breadth of topics in signal processing continues to grow, propelled by advances in digital signal processing theory as well as in new application domains. Researchers are therefore bombarded by new information in their areas of interest, but it is rather difficult to achieve a perspective of trends and advances in collateral areas. At the 2011 IEEE ICASSP in Prague, the program committee revived the idea of expert overview sessions called “Trends,” which are summary talks authored by the IEEE Signal Processing Society Technical Committees and presented by their keynote experts.
Autors: van der Veen, A.-J.;Principe, J.C.;
Appeared in: IEEE Signal Processing Magazine
Publication date: Sep 2011, volume: 28, issue:5, pages: 160 - 160
Publisher: IEEE
 
» 'App napping'?: Will holey handsets get caught
Abstract:
With 17 billion smartphone apps downloaded by the end of 2011, and Android apps having been compromised earlier in the year, how alert are we to the security dangers of the smartphone app? By the end of 2011 around 25 per cent of cellular handsets in active use in the UK will be a smartphone – up from around 18 per cent at the end of 2010. While this may not sound much of a rise, it is actually an upsurge of more than 38 per cent, and reflects a sea change that is happening in the world of cellular phones.
Autors: Gold, S.;
Appeared in: Engineering & Technology
Publication date: Sep 2011, volume: 6, issue:8, pages: 78 - 81
Publisher: IEEE
 
» (k, r)-Dominating set-based, weighted and adaptive clustering algorithms for mobile ad hoc networks
Abstract:
The creation of stable, scalable and adaptive clusters with good performance, faster convergence rate and with minimal overhead is a challenging task in mobile ad hoc networks (MANETs). This study proposes two clustering techniques for MANETs, which are (k, r)-dominating set-based, weighted and adaptive to changes in the network topology. The set of dominating nodes functions as the clusterheads. The scenario-based clustering algorithm for MANETs (SCAM) is a greedy approximation algorithm, whereas the distributed-SCAM (DSCAM) selects the (k, r)-dominating set through a distributed election mechanism. These algorithms achieve variable degree of clusterhead redundancy through the parameter k which contributes to reliability. Similarly, flexibility in creating variable diameter clusters is achieved with the parameter r. To improve the stability of the created clusters, the affiliation of other nodes with the clusterhead is decided based on the quality of the clusterhead, which is a function of connectivity, stability, residual battery power and transmission range. Mechanisms are available for accounting the group mobility and load balancing. The performance of these algorithms are evaluated through simulation and the results show that these algorithms create stable, scalable and load-balanced clusters with relatively less control overhead in comparison with the existing popular algorithms.
Autors: Anitha, V.S.;Sebastian, M.P.;
Appeared in: IET Communications
Publication date: Sep 2011, volume: 5, issue:13, pages: 1836 - 1853
Publisher: IEEE
 
» (Quasi 3D) Numerical simulation of operation of a capacitive type nanoparticle counter
Abstract:

Highlights

? A capacitive type nanodetector is modeled by numerical simulation. ? Detector is based on counting condensated micron sized droplets. ? Electrostatic energy change during impaction results in femtofarad capacitance change. ? Detector design can be improved by assuring deep well formation of a droplet.


Autors: Operation of a nanoparticle counter is based on condensation of water on nanoparticles forming water droplets which are fed to a capacitive type detector. Impaction of a water droplet onto the water filled detector causes formation of a crater result
Appeared in: Journal of Electrostatics
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» -Dissipativity analysis of singular time-delay systems
Abstract:
In this paper, the problem of delay-dependent-dissipativity analysis is investigated for continuous-time singular systems with time-delay. Using the delay partitioning technique, sufficient conditions are established in terms of linear matrix inequalities (LMIs), which guarantees a singular system to be admissible and strictly--dissipative. In addition to delay dependence, the obtained results are also dependent on the parameter. Moreover, the results ofperformance analysis and passivity analysis are unified from the dissipative analysis results. The results developed in this paper are less conservative than existing ones in the literature, which are illustrated by several examples.
Autors: Zhiguang Feng, James Lam, Huijun Gao
Appeared in: Automatica
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 1.5-V Complex Filters Using Current Mirrors
Abstract:
The derivation of complex filter topologies according to leapfrog and topological emulation techniques is presented in this brief, where the employed active elements are low-voltage current mirrors. Thus, the offered benefits are the capability of operating in a modern low-voltage environment, the absence of resistors, and the electronic tuning of the frequency characteristics. A 12th-order complex filter function has been realized by employing the aforementioned techniques, and the performance of the corresponding topologies, fabricated in an Austria Mircro Systems 0.35- complementary Metal-Oxide-Semiconductor process, has been experimentally verified.
Autors: Laoudias, C.;Psychalinos, C.;
Appeared in: IEEE Transactions on Circuits and Systems II: Express Briefs
Publication date: Sep 2011, volume: 58, issue:9, pages: 575 - 579
Publisher: IEEE
 
» 1.58-GHz Third-Order CMOS Active Bandpass Filter With Improved Passband Flatness
Abstract:
This paper presents a third-order active bandpass filter (BPF), realized in an area of 0.58% by 0.44% at 1.58 GHz (not including contact pads and is the free-space wavelength at 1.58 GHz) using standard CMOS one-poly six-metal technology. A survey of the literature shows that a prototype of such a BPF has the lowest normalized area per resonator of active BPFs. The synthetic transmission line, which is used in the active BPF herein, enables the prototype to be substantially miniaturized. Moreover, this paper describes a modified composite cross-coupled nMOS resonator that can equalize passband ripples. A comparison between the measured and simulated data verifies the third-order filter response with 8% 3-dB bandwidth at 1.58 GHz. The insertion loss is 0.68 dB at the central frequency with a passband ripple of 1.24 dB and the active BPF consumes 8 mA from a 1.8-V supply.
Autors: Lee, M.-L.;Wu, H.-S.;Clive Tzuang, C.-K.;
Appeared in: IEEE Transactions on Microwave Theory and Techniques
Publication date: Sep 2011, volume: 59, issue:9, pages: 2275 - 2284
Publisher: IEEE
 
» 100-Gb/s and beyond transceiver technologies
Abstract:

Highlights

? Mainstream, high volume 100-Gb/s Ethernet optics use 4 channel WDM (DFB) or parallel (VCSEL) NRZ laser PIC technologies. ? 400-Gb/s is a likely next Ethernet data rate based on extending 100-Gb/s NRZ laser PIC technologies to 16 channels. ? To efficiently carry 400-Gb/s Ethernet, the next OTN rate, OTU-5, will likely be ~450-Gb/s. ? 1.6-Tb/s is a likely follow on data rate requiring new technologies such as complex modulation PICs and CMOS DSP ICs.


Autors: First generation 100-Gb/s Ethernet transceiver architecture, standards and components are presented. Second generation 100-Gb/s architecture, standards and enabling photonic integration component technology are then described. Extension of this techn
Appeared in: Optical Fiber Technology
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 100G in the network of Deutsche Telekom
Abstract:

Highlights

? DP-QPSK-CD format and DSP enable cost effective next generation Tb/s networks. ? Fiber impairments can be efficiently compensated by DSP in advanced receivers. ? A 100 Gb/s DWDM transmission formats fit into existing fiber network infrastructure. ? Silicon photonics is a key technology in next generation higher speed interfaces.


Autors: The increased traffic demand in data centers and optical transport networks requires higher speed interfaces for the intra- and inter- connections between routers and switches. After 3 years the 100 Gb/s Ethernet (100GE) interface was standardized in
Appeared in: Optical Fiber Technology
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 100G optical transport based on polarization and/or subcarrier multiplexed modulation formats
Abstract:

Highlights

? A comprehensive paper and helpful guide on 100G modulation format optimizations. ? A presentation of extensive lab transmission and carrier trial results with some of the leading system performances. ? Expert discussion on practical implementation issues and trade-offs of 100G modulation formats.


Autors: Future optical transport systems at 100G and beyond will inevitably make use of advanced modulation formats and digital signal processing techniques. In this contribution, we discuss 100G techniques based on the combination of subcarrier multiplexing
Appeared in: Optical Fiber Technology
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 100GbE and beyond for warehouse scale computing interconnects
Abstract:

Highlights

? As computation moves into the cloud, the computing platforms are no longer stand-alone servers but warehouse-scale computers. ? New internet applications such as cloud computing and CDN are now reshaping the network landscape. ? In warehouse scale computing infrastructure, interconnections are aggregated with hierarchies of switching fabrics. ? Intra-datacenter connections can take advantage of a fiber-rich physical layer. ? Fiber-scarce inter-datacenter connections will drive the adoption of 100GbE and beyond in the massive WSC environments.


Autors: Increasing broadband penetration in the last few years has resulted in a dramatic growth in innovative, bandwidth-intensive applications that have been embraced by the consumers. Coupled with this consumer trend is the migration from local compute/st
Appeared in: Optical Fiber Technology
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 12% efficient CdTe/CdS thin film solar cells deposited by low-temperature close space sublimation
Abstract:
We report 12% efficient CdS/CdTe thin film solar cells prepared by low temperature close space sublimation (CSS). Both semiconductor films, CdS and CdTe, were deposited by high vacuum CSS in superstrate configuration on glass substrates with fluorine doped tin oxide (FTO) front contact. The CdTe deposition was carried out at a substrate temperature (Tsub) of 340 ∘C, which is much lower than that used in conventional processes (>500 ∘C). The CdTe films were treated with the usual CdCl2 activation process. Different optimal annealing times and temperatures were found for low-temperature cells (Tsub 340 ∘C) compared to high-temperature cells (Tsub = 520 ∘C). The influence of the activation step on the morphology of high-temperature and low-temperature CdTe is determined by XRD, AFM, SEM top views, and SEM cross-sections. Grain growth, strong recrystallization, and a reduction of planar defects during the activation step are observed, especially for low-temperature CdTe. Further, the influence of CdS deposition parameters on the solar cell performance is investigated by using three different sets of parameters with different deposition rates and substrate temperatures for the CdS preparation. Efficiencies about 10.9% with a copper-free back contact and 12.0% with a copper-containing back contact were achieved using the low temperature CdTe process.
Autors: Schaffner, Judith;Motzko, Markus;Tueschen, Alexander;Swirschuk, Andreas;Schimper, Hermann-Josef;Klein, Andreas;Modes, Thomas;Zywitzki, Olaf;Jaegermann, Wolfram;
Appeared in: Journal of Applied Physics
Publication date: Sep 2011, volume: 110, issue:6, pages: 064508 - 064508-6
Publisher: IEEE
 
» 14.2 W/mm internally-matched AlGaN/GaN HEMT for X-band applications
Abstract:

Highlights

? We optimize ?-gate process in combination with source-connected field plate. ? High breakdown voltages and low current collapse guarantee excellent capabilities. ? Internal matching circuits adopt an L-C-L topology with good tuning flexibility. ? Our GaN HEMT amplifier exhibits highest power density of 14.2 W/mm at 8 GHz.


Autors: High-performance X-band AlGaN/GaN high electron mobility transistor (HEMT) has been achieved by ?-gate process in combination with source-connected field plate. Both its Schottky breakdown voltage and pinch-off breakdown voltage are higher than 100 V
Appeared in: Solid-State Electronics
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 170-862 MHz, 6.16 mW compact switched-gain low-noise amplifier
Abstract:
This paper presents a switched-gain low-noise amplifier (SGLNA). The proposed SGLNA achieves three-step variable gains by combining the current-steering and inter-stage impedance-mismatching techniques. The proposed amplifier was designed using a TSMC 0.18 ?m mixed-signal CMOS process. Post-layout simulation results demonstrate that the SGLNA achieves a gain range of -24.9-+21.8 dB and a noise figure range of 3.56-4.13 dB over the frequency range of 170-862 MHz. TheS11andS22are both <-15 dB over the same frequency range. The SGLNA occupies an active area of 0.053 mmand consumes 6.16 mW in high-gain mode from a 1.8 V power supply.
Autors: Chun-Chieh Chen, Ping-Huan Tsai, Yen-Chun Wang
Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 1F ESD protection device for gigahertz high-frequency output ESD protection
Abstract:
A mutual-protection scheme is proposed to achieve an ultra-low capacitance electrostatic discharge (ESD) protection device. The ESD protection device can not only dissipate ESD current, but also can make the vulnerable output transistor have the ESD protection capability. Namely, the output transistor can also protect ICs and help the ESD protection device to share the ESD current. Using this scheme can discharge more ESD current than the summation current of the two individual devices. From the ESD test result, it can achieve the required ESD level by using the ultra-low capacitance ESD protection device (~1.2 fF).
Autors: Huang, S.-C.;Chen, K.-H.;Lee, J.-H.;Wu, Y.-H.;
Appeared in: Electronics Letters
Publication date: Sep 2011, volume: 47, issue:18, pages: 1021 - 1022
Publisher: IEEE
 
» 2 W high efficiency PbS mid-infrared surface emitting laser
Abstract:
High efficiency laser operation with output power exceeding 2 W was obtained for vertical external-cavity PbS based IV-VI compound surface emitting quantum-well structures. The laser showed external quantum efficiency as high as 16%. Generally, mid-infrared III-V or II-VI semiconductor laser operation utilizing interband electron transitions are restricted by Auger recombination and free carrier absorption. Auger recombination is much lower in the IV-VI semiconductors, and the free-carrier absorption is significantly reduced by an optically pumped laser structure including multi-step optical excitation layers.
Autors: Ishida, A.;Sugiyama, Y.;Isaji, Y.;Kodama, K.;Takano, Y.;Sakata, H.;Rahim, M.;Khiar, A.;Fill, M.;Felder, F.;Zogg, H.;
Appeared in: Applied Physics Letters
Publication date: Sep 2011, volume: 99, issue:12, pages: 121109 - 121109-3
Publisher: IEEE
 
» 2.5 Gbit/s burst-mode receiver with power-level burst-detection for XG-PON1 systems
Abstract:
A 2.5 Gbit/s burst-mode receiver with power-level burst-detection and a time-critical control circuit is presented. With its unique topology, this receiver is successfully operated as a long-reach XG-PON1, where the quiet-window for ranging operation exceeds the time variation of the round-trip propagation delay for up to 40 km.
Autors: Kim, J.;Le, Q.;Bang, H.;Park, C.S.;
Appeared in: Electronics Letters
Publication date: Sep 2011, volume: 47, issue:19, pages: 1086 - 1087
Publisher: IEEE
 
» 20-Gb/s/ch High-Speed Low-Power 1-Tb/s Multilayer Optical Printed Circuit Board With Lens-Integrated Optical Devices and CMOS IC
Abstract:
A high-speed large-capacity optical printed circuit board (OPCB) for next-generation high-capacity routers and servers was developed. This OPCB is composed of a multilayer polymer optical waveguide, a receiver optical input/output (I/O) module (with a lens-integrated photodiode and a SiGe transimpedance amplifier), and a low-power (7.1 mW/Gb/s) transmitter optical I/O module consisting of a lens-integrated surface-emitting laser and complementary metal–oxide–semiconductor (CMOS) driver IC. A 1-Tb/s (20 Gb/s/ch 48 ch per transmitter or receiver) large-capacity OPCB prototype was fabricated and demonstrated 20-Gb/s/ch operation.
Autors: Matsuoka, Y.;Kawamura, D.;Adachi, K.;Lee, Y.;Hamamura, S.;Takai, T.;Shibata, T.;Masuda, H.;Chujo, N.;Sugawara, T.;
Appeared in: IEEE Photonics Technology Letters
Publication date: Sep 2011, volume: 23, issue:18, pages: 1352 - 1354
Publisher: IEEE
 
» 220-GHz Quaternary Barrier InAlGaN/AlN/GaN HEMTs
Abstract:
Depletion-mode high-electron mobility transistors (HEMTs) based on a quaternary barrier heterostructure on SiC substrate were fabricated. The 66-nm-long gate device shows a dc drain current density of 2.1 A/mm, a peak extrinsic transconductance of 548 mS/mm, and a record current gain cutoff frequency of 220 GHz for quaternary barrier GaN-based HEMTs, which is also among the highest for all GaN-based HEMTs. The large product of 14.5 with a gate-length-to-barrier-thickness aspect ratio of 5.8 indicates a high effective electron velocity of , attributed to a high electron Hall mobility (1790 at an of )—the highest reported in GaN-channel HEMTs with In-containing barriers. An intrinsic electron velocity of , extracted from conventional Moll delay-time analysis, is comparable to that reported in the state-of-art AlGaN/GaN HEMTs.
Autors: Wang, R.;Li, G.;Verma, J.;Sensale-Rodriguez, B.;Fang, T.;Guo, J.;Hu, Z.;Laboutin, O.;Cao, Y.;Johnson, W.;Snider, G.;Fay, P.;Jena, D.;Xing, H.;
Appeared in: IEEE Electron Device Letters
Publication date: Sep 2011, volume: 32, issue:9, pages: 1215 - 1217
Publisher: IEEE
 
» 224-Gb/s POLMUX-RZ-16QAM for next generation high-capacity optical transmission systems
Abstract:

Highlights

? POLMUX-RZ-16QAM enables transmitting a data rate of 224 Gb/s with a SE of 4.2 b/s/Hz. ? The 224 Gb/s signal has a penalty of 4.3 dB in comparison to theoretical limit. ? Transmission of 11 × 224 Gb/s over 1500 km has been successfully demonstrated.


Autors: In this paper, we study the 224-Gb/s polarization multiplexed, return to zero, 16-level quadrature amplitude modulation (POLMUX-RZ-16QAM) as a candidate for next generation high capacity optical transmission systems. We discuss the main challenges as
Appeared in: Optical Fiber Technology
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 2D analytical calculation of the electric field in lightly doped Schottky barrier double-gate MOSFETs and estimation of the tunneling/thermionic current
Abstract:

Highlights

? An analytical approach to calculate the electric field in SB-DG-MOSFETs was presented. ? It is valid for subthreshold region and does not introduce any fitting parameters, all parameters depend on geometry and boundary conditions. ? An approach to calculate the tunneling and thermionic current in SB-DG-MOSFETs was presented. ? The approach shows a good agreement with the simulation results down to 65 nm channel lengths in the subthreshold region. ? The model presented here is able to predict the current well for several barrier heights and geometries.


Autors: In this paper we present a new approach to calculate the channel electric field within a Schottky barrier Double-Gate MOSFET (SB-DG-MOSFET) in subthreshold region by solving Poissons equation. The Poisson equation is solved two dimensionally in an an
Appeared in: Solid-State Electronics
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 3-D Analytical and Numerical Modeling of Tubular Actuators With Skewed Permanent Magnets
Abstract:
This paper considers analytical and numerical techniques to model the magnetic field distribution in a tubular actuator with skewed permanent magnets (PMs). A fast 3-D analytical model based on Fourier analysis is developed for calculation of the various field components resulting from the skewed PMs for various skewing topologies. This techniques provides means for validating the assumptions of 2.5-D multilayer methods. Furthermore, a 2.5-D analytical multilayer model is derived for calculation of the cogging force due to the slot openings including skewed PMs. The analytical methods are validated by means of 3-D finite element analysis.
Autors: Gysen, B. L. J.;Meessen, K. J.;Paulides, J. J. H.;Lomonova, E. A.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Sep 2011, volume: 47, issue:9, pages: 2200 - 2212
Publisher: IEEE
 
» 3-D Vertical FG nand Flash Memory With a Novel Electrical S/D Technique Using the Extended Sidewall Control Gate
Abstract:
We propose a novel 3-D vertical floating-gate (FG) nand Flash memory cell array with a novel electrical source/drain (S/D) technique using extended sidewall control gates (ESCGs). A cylindrical FG structure is implemented to overcome the reliability issues of charge-trap-type cells. A novel electrical S/D layer by the ESCG structure also allows enhancement-mode operation. With this novel structure, we successfully demonstrate normal Flash cell operation with high-speed programming and superior read currents due to both the increase in coupling ratio and the use of low resistive electrical S/D technique by device simulation. Moreover, we found that the 3-D vertical Flash memory cell array with the novel electrical S/D technique had less interference with neighboring cells by about 50% in comparison with the conventional 3-D vertical FG nand cell array without an ESCG. Above all, the proposed cell array is one of the candidates for a Terabit 3-D vertical nand Flash cell array with high-speed read/program operation and high reliability.
Autors: Seo, M.-S.;Park, S.-K.;Endoh, T.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Sep 2011, volume: 58, issue:9, pages: 2966 - 2973
Publisher: IEEE
 
» 30 Gbit/s, 850 nm, VCSEL-based optical link
Abstract:
A complete 30 Gbit/s VCSEL link is reported. The driver and receiver amplifiers were fabricated in a 0.13 μm SiGe BiCMOS process and the 850 nm VCSELs and photodetectors are commercial 10 Gbit/s-class components. Transmitter pre-emphasis applied through the feedforward equaliser circuit enables the full link to operate at 30 Gbit/s at a bit error ratio less than 10-12 with a 9 dB link budget.
Autors: Schow, C.L.;Rylyakov, A.V.;
Appeared in: Electronics Letters
Publication date: Sep 2011, volume: 47, issue:18, pages: 1035 - 1036
Publisher: IEEE
 
» 30-Gb/s 3 3 Optical Mode Group-Division-Multiplexing System With Optimized Joint Detection
Abstract:
This letter investigates a 30-Gb/s 3 3 optical mode group-division-multiplexing (MGDM) system over graded index-multimode fiber (GI-MMF). With mode-selective spatial filtering (MSSF), the optimized joint detection has been realized, which decreases the complexity of the signal processing to recover received signals.Pub _bookmark Command="[Quick Mark]"
Autors: Chen, H. S.;van den Boom, H. P. A.;Koonen, A. M. J.;
Appeared in: IEEE Photonics Technology Letters
Publication date: Sep 2011, volume: 23, issue:18, pages: 1283 - 1285
Publisher: IEEE
 
» 3? End Formation of PIWI-Interacting RNAs In Vitro
Abstract:
image

Highlights

? Establishment of a cell-free system recapitulating key steps of piRNA biogenesis ? PIWI proteins incorporate long pre-piRNAs with faithful 5?-nucleotide preference ? 3? end of PIWI-loaded pre-piRNAs is trimmed by a Mg-dependent 3? to 5? exonuclease ? 2?-O-methylation of piRNA 3? ends is tightly coupled with trimming

Autors:

Graphical Abstract

Appeared in: Automatica
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 3D analytical solution for a functionally graded transversely isotropic piezoelectric circular plate under tension and bending
Abstract:
A three-dimensional (3D) analysis of a functionally graded piezoelectric circular plate under tension and bending is carried out. A direct displacement method is developed, with analytical solutions obtained for plate with either free or simply-supported edge conditions. The material properties of the plate can vary arbitrarily along the thickness except that the strain-energy function should be positive definite as required for stable materials and certain integrable conditions are assumed valid during the derivation. The validity of the present solutions is discussed both analytically and numerically. Numerical analyses are made for a specific functionally graded material to show the influence of material heterogeneity on the piezoelastic field.
Autors: X.Y. Li, J. Wu, H.J. Ding, W.Q. Chen
Appeared in: International Journal of Engineering Science
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 3D floorplanning of low-power and area-efficient Network-on-Chip architecture
Abstract:
Network-on-Chip (NoC) architectures have been adopted by chip multi-processors (CMPs) as a flexible solution to the increasing delay in the deep sub-micron regime. However, the shrinking feature size limits the performance of NoCs due to power and area constraints. In this paper, we propose three 3D floorplanning methods for a Triplet-based Hierarchical Interconnection Network (THIN) which is a new high performance NoC. The proposed floorplanning methods use both Manhattan and Y-architecture routing architectures so as to improve the performance, reduce the power consumption and area requirement of THIN. A cycle accurate simulator was developed based on Noxim NoC simulator and ORION 2.0 energy model. The proposed floorplanning methods show up to 24.69% energy and 8.84% area reduction at best compared with 3D Mesh. Our analysis concludes that THIN is not only a feasible but also a low-power and area-efficient NoC at physical level.
Autors: Licheng Xue, Feng Shi, Weixing Ji, Haroon-Ur-Rashid Khan
Appeared in: Microprocessors and Microsystems
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» 40-Gb/s 16-ary All-Optical Logic Minterms Generation for Four-Line Inputs
Abstract:
We have experimentally demonstrated 16-ary all-optical logic minterms for four-line inputs at 40 Gb/s utilizing delay interferometers (DIs) and cascading semiconductor optical amplifiers (SOAs) without any assisting light. Extinction ratios (ERs) of the intermediate results after the first SOA are all over 11 dB which ensures the capability to cascade to the second one. The final results are in the form of return-to-zero (RZ) format with correct and clear temporal waveforms. The proposed scheme should be a promising candidate for constructing arbitrary more complex logic functions.Pub _bookmark Command="[Quick Mark]"
Autors: Lei, L.;Zhang, Y.;Dong, J.;Yu, Y.;Zhang, X.;
Appeared in: IEEE Photonics Technology Letters
Publication date: Sep 2011, volume: 23, issue:18, pages: 1322 - 1324
Publisher: IEEE
 
» 5 MHz phase detector with low residual flicker
Abstract:
The measurement of close-to-carrier phase modulation (PM) noise of state-of-the-art oscillators is always challenging. Quite often the residual noise of the phase detector used in these measurements is higher than the noise of the source at Fourier offset frequencies between 5 and 100 Hz. A conventional double balanced mixer using 2N2222A transistors as the nonlinear components of a diode ring was constructed for use as a phase detector. Residual single-sideband PM noise measurements at 5 MHz for this device have shown a low flicker noise floor of L(10 Hz) = 2163 dBc/Hz. When this mixer design is implemented in a dual-channel measurement system, a cross-correlated PM noise floor of better than L(10 Hz) = -170 dBc/Hz is expected.
Autors: Barnes, C.A.;Hati, A.;Nelson, C.W.;Howe, D.A.;
Appeared in: Electronics Letters
Publication date: Sep 2011, volume: 47, issue:19, pages: 1066 - 1067
Publisher: IEEE
 
» 65-nm CMOS Monolithically Integrated Subterahertz Transmitter
Abstract:
This letter presents a transmitter for subterahertz radiation (up to 160 GHz), which consists of a nonlinear transmission line (NLTL) and an extremely wideband (EWB) slot antenna on a silicon substrate of low resistivity (10 ). The fabrication was realized using a commercially available 65-nm CMOS process. On-wafer characterization of the whole transmitter, of the stand-alone EWB antenna, and of the stand-alone NLTL is presented. Reflection measurements show that the stand-alone EWB antenna has a 10-dB impedance bandwidth in the frequency bands of 75–100 GHz and 220–325 GHz, which agrees very well with the simulation results. The simulated radiation patterns of the antenna are also presented, indicating that the transmitter has an ominidirectional performance. The output power of the NLTL alone and of the transmitter is measured up to 160 GHz, from which the power gain of the on-chip antenna is derived and has a maximum value of 9.5 dBi between 90 and 120 GHz.
Autors: Hu, X.;Tripodi, L.;Matters-Kammerer, M. K.;Cheng, S.;Rydberg, A.;
Appeared in: IEEE Electron Device Letters
Publication date: Sep 2011, volume: 32, issue:9, pages: 1182 - 1184
Publisher: IEEE
 
» 9/11 and the rise of robots [Spectral Lines]
Abstract:
September 11 had quite a different meaning for me before it became 9/11. It's my birthday. And early on that cool blue morning I took my daily run from our Chelsea apartment down the West Side Highway past the World Trade Center to South Ferry and back. I never thought much about the Twin Towers then, except sometimes to remember the convoluted history of how they got built in the first place, or to feel their overwhelming presence in what was then a low-rise part of Manhattan as I breezed past, with no sense of how gigantic their absence might become.
Autors: Hassler, S.;
Appeared in: IEEE Spectrum
Publication date: Sep 2011, volume: 48, issue:9, pages: 8 - 8
Publisher: IEEE
 
» : A New Real-Time Multi-Source Mobile-Streaming Architecture
Abstract:
Video streaming to mobile users is gaining a tremendous momentum within the communities of both industrial and academic researchers. While the networking technologies continue to evolve, video streaming applications are still prone to constrained bandwidth and also to highly varying network dynamics. This paper addresses these issues and attempts to provide a unique solution by proposing a new multi-source streaming strategy specifically tailored for next generation mobile networks for delivering multimedia services to mobile users. The proposed strategy is dubbed , Multi-Source Mobile Streaming, which comprises a set of mechanisms that aim at ensuring seamless, continuous, and smooth playback of video for roaming users, guaranteeing an efficient and fair utilization of network resources while meeting the playback and buffer constraints of the clients, preventing redundant transmissions and minimizing packet reordering. Through various computer simulations, the performance of is then validated. The simulation results are encouraging and exhibit the effectiveness of the adopted architecture.
Autors: Taleb, T.;Hashimoto, K.;
Appeared in: IEEE Transactions on Broadcasting
Publication date: Sep 2011, volume: 57, issue:3, pages: 662 - 673
Publisher: IEEE
 
» ?-Dissipativity analysis of singular time-delay systems?
Abstract:
In this paper, the problem of delay-dependent ?-dissipativity analysis is investigated for continuous-time singular systems with time-delay. Using the delay partitioning technique, sufficient conditions are established in terms of linear matrix inequalities (LMIs), which guarantees a singular system to be admissible and strictly (Q,S,R)-?-dissipative. In addition to delay dependence, the obtained results are also dependent on the parameter ?. Moreover, the results of H? performance analysis and passivity analysis are unified from the dissipative analysis results. The results developed in this paper are less conservative than existing ones in the literature, which are illustrated by several examples.
Autors: Zhiguang, Feng , James, Lam , Huijun, Gao
Appeared in: Automatica
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A 0.46-mm 4-dB NF Unified Receiver Front-End for Full-Band Mobile TV in 65-nm CMOS
Abstract:
A unified receiver front-end (RFE) for mobile TV covering the VHF-III, UHF and L bands is described. Performance, power and area efficiencies are advanced in threefold: 1) a gain-boosting current-balancing balun-LNA exhibits high linearity, wideband output balancing and adequate against gain control; 2) a current-reuse mixer-low-pass-filter merges quadrature-/harmonic-rejection mixing and third-order current-mode post-filtering in one block, enhancing linearity and noise just where both are demanding, while saving power and area for its simplicity; 3) a direct injection-locked 4-/8-phase LO generator relaxes the master LO frequency by avoiding frequency division. Fabricated in 65-nm CMOS the RFE measures 4-dB noise figure, 17-to-35-dB gain range, and 32 3.4-dBm IIP2/IIP3 with no tuning. The power consumption ranges from 43 (170 MHz) to 55 mW (1.7 GHz) at 1.2-/2.5-V supplies. The die size is 0.46 mm .
Autors: Mak, P.-I.;Martins, R. P.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Sep 2011, volume: 46, issue:9, pages: 1970 - 1984
Publisher: IEEE
 
» A 0.4 dB noise figure wideband low-noise amplifier using a novel InGaAs/InAlAs/InP device
Abstract:
In this work, the design of a novel low-noise amplifier (LNA) based on 1 ?m gate-length InGaAs/InAlAs/InP pHEMT transistors is discussed. Designed for radioastronomy applications, this amplifier exploits a common-drain configuration as input stage and a common-source inductive degeneration topology as output stage. It exhibits a maximum gain of 30 dB within an input 1 dB compression point of -16 dBm. The noise figure is 0.4 dB with an input return loss greater than -10 dB and an output return loss of -12.5 dB. The LNA consumes 85 mW from a 1.5 V power supply.
Autors: Z. Hamaizia, N. Sengouga, M. Missous, M.C.E. Yagoub
Appeared in: Materials Science in Semiconductor Processing
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A 0.8 ps DNL Time-to-Digital Converter With 250 MHz Event Rate in 65 nm CMOS for Time-Mode-Based Modulator
Abstract:
A time-to-digital converter (TDC) is proposed to replace the multi-bit quantizer and the multi-bit feedback DAC of traditional voltage-mode modulator. Since time-mode systems process analog signals encoded in the time dimension rather than the voltage dimension, the proposed time-mode TDC makes the multi-bit ADC digital friendly and more suitable for nanometric technologies. A pulse-width-modulator (PWM) converts the sampled-and-held voltage-sample to a digital pulse whose width is proportional to the voltage level of the sample. Then, the TDC generates a digital code that corresponds to the pulse width. Simultaneously, the TDC provides a time-quantized feedback pulse for the modulator, emulating the voltage-DAC in a conventional ADC. Linearity, jitter and data-dependent-delay effects on the performance of the proposed architecture are analyzed. A chip prototype is fabricated in TI 65 nm digital CMOS process. THD of 67 dB is achieved which corresponds to a TDC's DNL of less than 0.8 ps without calibration. Measurements show that the -modulator achieves a dynamic range of 68 dB and the TDC consumes 5.66 mW at 250 MHz event rate while occupying 0.006 mm .
Autors: Elsayed, M. M.;Dhanasekaran, V.;Gambhir, M.;Silva-Martinez, J.;Sanchez-Sinencio, E.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Sep 2011, volume: 46, issue:9, pages: 2084 - 2098
Publisher: IEEE
 
» A 122-GHz SiGe-Based Signal-Generation Chip Employing a Fundamental-Wave Oscillator With Capacitive Feedback Frequency-Enhancement
Abstract:
This paper presents a highly integrated and fully balanced signal generation block comprising a fundamental-wave voltage-controlled oscillator (VCO), an output buffer, and a configurable frequency divider stage (prescaler). The VCO introduces a negative resistance structure in conjunction with capacitive cross-coupling. This compound structure allows fundamental oscillation to be sustained at high frequencies while providing wide tuning ranges. The capabilities of the capacitive feedback were analyzed using a linear transistor model, and boundary conditions, which support the early design phase, were derived. The chip was fabricated in a SiGe technology with 300-GHz HBTs. The output frequency of the monolithic microwave integrated circuit is centered at 122 GHz and provides a tuning range of 16 GHz at an average single-sideband phase noise of 95 dBc/Hz at 1 MHz offset frequency. Possible applications include ISM applications at 122 GHz and short-range radar systems with wide tuning ranges.
Autors: Jahn, M.;Knapp, H.;Stelzer, A.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Sep 2011, volume: 46, issue:9, pages: 2009 - 2020
Publisher: IEEE
 
» A 12b 50 MS/s 21.6 mW 0.18 m CMOS ADC Maximally Sharing Capacitors and Op-Amps
Abstract:
A 12b 50 MS/s 0.18 m CMOS pipeline ADC is described. The proposed capacitor and operational amplifier (op-amp) sharing techniques merge the front-end sample-and-hold amplifier (SHA) and the first multiplying digital-to-analog converter (MDAC1) to achieve low power without an additional reset timing and a memory effect. The second and third MDACs share a single op-amp to reduce power consumption further. A shared op-amp of the merged SHA and MDAC1 controls properly the input trans-conductance for stability at each clock phase of holding and amplifying. The prototype ADC in a 0.18 m CMOS process demonstrates the measured differential and integral nonlinearities within 0.53 LSB and 2.09 LSB, respectively. The ADC shows a maximum signal-to-noise-and-distortion ratio of 60.6 dB and a maximum spurious-free dynamic range of 69.4 dB at 50 MS/s. The ADC with an active die area of 0.93 mm consumes 21.6 mW at 50 MS/s and 1.8 V.
Autors: Lee, K.-H.;Kim, K.-S.;Lee, S.-H.;
Appeared in: IEEE Transactions on Circuits and Systems I: Regular Papers
Publication date: Sep 2011, volume: 58, issue:9, pages: 2127 - 2136
Publisher: IEEE
 
» A 16-kV HBM RF ESD Protection Codesign for a 1-mW CMOS Direct Conversion Receiver Operating in the 2.4-GHz ISM Band
Abstract:
A decreasing-sized -model electrostatic discharge (ESD) protection structure is presented and applied to protect against ESD stresses at the RF input pad of an ultra-low power CMOS front-end operating in the 2.4-GHz industrial–scientific–medical band. The proposed ESD protection structure is composed of a pair of ESD devices located near the RF pad, another pair close to the core circuit, and a high-quality integrated inductor connecting these two pairs. This structure can sustain a human body-model ESD level higher than 16 kV and a machine-model ESD level higher than 1 kV without degrading the RF performance of the front-end. A combined on-wafer transmission line pulse and RF test methodology for RF circuits is also presented confirming previous results. The front-end implements a zero-IF receiver. It has been implemented in a standard 2P6M 0.18- m CMOS process. It exhibits a voltage gain of 24 dB and a single-sideband noise figure of 8.4 dB, which make it suitable for most of the 2.4-GHz wireless short-range communication transceivers. The power consumption is only 1.06 mW from a 1.2-V voltage supply.
Autors: Gonzalez, J. L.;Solar, H.;Adin, I.;Mateo, D.;Berenguer, R.;
Appeared in: IEEE Transactions on Microwave Theory and Techniques
Publication date: Sep 2011, volume: 59, issue:9, pages: 2318 - 2330
Publisher: IEEE
 
» A 2 MV Van de Graaff accelerator as a tool for planetary and impact physics research
Abstract:
Investigating the dynamical and physical properties of cosmic dust can reveal a great deal of information about both the dust and its many sources. Over recent years, several spacecraft (e.g., Cassini, Stardust, Galileo, and Ulysses) have successfully characterised interstellar, interplanetary, and circumplanetary dust using a variety of techniques, including in situ analyses and sample return. Charge, mass, and velocity measurements of the dust are performed either directly (induced charge signals) or indirectly (mass and velocity from impact ionisation signals or crater morphology) and constrain the dynamical parameters of the dust grains. Dust compositional information may be obtained via either time-of-flight mass spectrometry of the impact plasma or direct sample return. The accurate and reliable interpretation of collected spacecraft data requires a comprehensive programme of terrestrial instrument calibration. This process involves accelerating suitable solar system analogue dust particles to hypervelocity speeds in the laboratory, an activity performed at the Max Planck Institut für Kernphysik in Heidelberg, Germany. Here, a 2 MV Van de Graaff accelerator electrostatically accelerates charged micron and submicron-sized dust particles to speeds up to 80  km s-1. Recent advances in dust production and processing have allowed solar system analogue dust particles (silicates and other minerals) to be coated with a thin conductive shell, enabling them to be charged and accelerated. Refinements and upgrades to the beam line instrumentation and electronics now allow for the reliable selection of particles at velocities of 1–80  km s-1 and with diameters of between 0.05  μm and 5  μm. This ability to select particles for subsequent impact studies based on their charges, masses, or velocities is provided by a particle selection unit (PSU). The PSU contains a field program- - mable gate array, capable of monitoring in real time the particles’ speeds and charges, and is controlled remotely by a custom, platform independent, software package. The new control instrumentation and electronics, together with the wide range of accelerable particle types, allow the controlled investigation of hypervelocity impact phenomena across a hitherto unobtainable range of impact parameters.
Autors: Mocker, Anna;Bugiel, Sebastian;Auer, Siegfried;Baust, Gunter;Colette, Andrew;Drake, Keith;Fiege, Katherina;Grun, Eberhard;Heckmann, Frieder;Helfert, Stefan;Hillier, Jonathan;Kempf, Sascha;Matt, Gunter;Mellert, Tobias;Munsat, Tobin;Otto, Katharina;Pos
Appeared in: Review of Scientific Instruments
Publication date: Sep 2011, volume: 82, issue:9, pages: 095111 - 095111-8
Publisher: IEEE
 
» A 2.5-V Low-Reference-Voltage 2.8-V Low- Collector–Voltage Operation 0.8–0.9-GHz Broadband CDMA BiFET Power Amplifier With an Input SPDT Band Select Switch
Abstract:
This paper describes circuit design and measurement results of a bipolar field-effect transistor monolithic microwave integrated circuit power amplifier (PA) module operating with a 2.5-V low reference voltage and a 2.8-V low collector supply voltage . While covering 824–925-MHz broadband CDMA operation at 2.8 V of , the PA allows a 1.1-V low and 18-dBm output power operation. This is realized using an on-chip step quiescent current control scheme depending on . In addition, an input high electron-mobility transistor single-pole double-throw switch is integrated on the PA die for selecting 800/900-MHz operating bands, thereby providing easy connectivity between a transmit surface acoustic wave filter and the PA. Measurement results under the 2.8/1.1-V and 2.5-V bias conditions show that the PA meets J-CDMA/W-CDMA power and distortion specifications sufficiently over a wide temperature range from 20 C to 85 C while realizing a broadband operation ranging from 824 to 925 MHz. For J-CDMA (IS-95B) modulation, the PA can deliver a 28-dBm ${ - - P}_{rm out}$, a 36% power-added efficiency (PAE), and a 50-dBc adjacent channel power ratio, while a 29-dBm , a 38% PAE, and a 40-dBc adjacent channel leakage power ratio (ACLR) are achieved for W-CDMA (3GPP R99) modulation. Under 3:1 load mismatching condition, the PA also suppresses ACLR of less than 36 dBc while keeping a forward power of 27.5 dBm. Moreover the PA is capable of delivering a 18-dBm and more than 26% PAE under 824–925-MHz and 1.1-V J-CDMA modulation test conditions. To the best of authors' knowledge, this is the first report on a broadband production-level CDMA PA operating with low and low .
Autors: Yamamoto, K.;Okamura, A.;Matsuzuka, T.;Yoshii, Y.;Miyashita, M.;Suzuki, S.;Inoue, A.;
Appeared in: IEEE Transactions on Microwave Theory and Techniques
Publication date: Sep 2011, volume: 59, issue:9, pages: 2306 - 2317
Publisher: IEEE
 
» A 240-frames/s 2.1-Mpixel CMOS Image Sensor With Column-Shared Cyclic ADCs
Abstract:
This paper proposes a low-power 240 frames/s 2.1 M-pixel CMOS image sensor with column-shared cyclic (CY) ADCs. Two-column shared CY-ADC architecture and two-level stacked ADC placement are employed for low-power and small pixel pitch design. The proposed CY-ADC uses only one OTA and four capacitors. Distributed clocking scheme using cascaded repeaters is proposed to reduce the required peak current. The prototype sensor was fabricated in a 0.13- 1P4M process with pixel pitch of 2.25 . The designed 10-bit ADC dissipates only 90 with 1.5 V supply. The measured DNL and INL are 0.59/ 0.83 LSB and 2.8/ 3.6 LSB, respectively. The measured maximum pixel rate is 500 Mpixels/s with total power consumption of 300 mW.
Autors: Lim, S.;Cheon, J.;Chae, Y.;Jung, W.;Lee, D.-H.;Kwon, M.;Yoo, K.;Ham, S.;Han, G.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Sep 2011, volume: 46, issue:9, pages: 2073 - 2083
Publisher: IEEE
 
» A 25 Gb/s 65-nm CMOS Low-Power Laser Diode Driver With Mutually Coupled Peaking Inductors for Optical Interconnects
Abstract:
A 25 Gb/s laser diode (LD) driver has been developed on the basis of standard 65 nm CMOS technology for optical interconnects. The LD driver consists of a main driver capable of providing an average current of 30 mA and a predriver providing a gain of 20 dB. The main driver uses mutually coupled inductors to adjust the inductive peaking to improve eye patterns under various packaging conditions. The predriver uses CMOS active feedback to achieve a wide bandwidth and high gain, despite its small size and low power consumption. The fabricated circuit achieves data rates of 25 Gb/s, consumes 156 mW (6.3 mW/Gb/s) and occupies an area of 0.011 .
Autors: Chujo, N.;Takai, T.;Sugawara, T.;Matsuoka, Y.;Kawamura, D.;Adachi, K.;Kawamata, T.;Ohno, T.;Ohhata, K.;
Appeared in: IEEE Transactions on Circuits and Systems I: Regular Papers
Publication date: Sep 2011, volume: 58, issue:9, pages: 2061 - 2068
Publisher: IEEE
 
» A 3D shape segmentation approach for robot grasping by parts
Abstract:

Highlights

? A method for planning robot grasps across similar objects by part correspondence. ? Topological decomposition of objects enables high-level semantic grasp planning. ? Reeb graphs are used for object segmentation and grasping. ? Evaluation of part-based object recognition and grasping by part capabilities.


Autors: Neuro-psychological findings have shown that human perception of objects is based on part decomposition. Most objects are made of multiple parts which are likely to be the entities actually involved in grasp affordances. Therefore, automatic object r
Appeared in: Robotics and Autonomous Systems
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A 5-GHz Direct Digital Frequency Synthesizer Using an Analog-Sine-Mapping Technique in 0.35- m SiGe BiCMOS
Abstract:
A direct digital frequency synthesizer (DDFS) using an analog-sine-mapping technique is presented in a 0.35- SiGe BiCMOS process. We intend to apply the translinear principle to develop a triangle-to-sine converter (TSC) that can achieve outputs with low harmonic content. The TSC is introduced for the DDFS to translate phase data to sine wave. Using this analog-interpolating technique, the DDFS, with 9 bits of phase resolution and 8 bits of amplitude resolution, can achieve operation at 5-GHz clock frequency and can further reduce power consumption and die area. The spurious-free dynamic range (SFDR) of the DDFS is better than 48 dBc at low synthesized frequencies, decreasing to 45.7 dBc worst case at the Nyquist synthesized frequency for output frequency band (0–2.5 GHz). The DDFS consumes 460 mW at a 3.3-V supply and achieves a high power efficiency figure of merit (FOM) of 10.87 GHz/W. The chip occupies .
Autors: Yang, C.-Y.;Weng, J.-H.;Chang, H.-Y.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Sep 2011, volume: 46, issue:9, pages: 2064 - 2072
Publisher: IEEE
 
» A 5.5-GHz 1-mW Full-Modulus-Range Programmable Frequency Divider in 90-nm CMOS Process
Abstract:
Operating up to 5.5 GHz with 1-mW power consumption, a 90-nm CMOS programmable frequency divider with eight stages of new static D-flip-flop-based (2/1) divider cells is presented, where the supply voltage of 1.0 V is employed. The divider achieves a full modulus range from 1 to 256 and operates over a wide range maintaining up to 4 GHz with 30-dBm input power. The divider also accomplishes a power efficiency of 12.8 GHz/mW with 0.5-V supply voltage. It is favorable for advanced processes.
Autors: Lin, C.-S.;Chien, T.-H.;Wey, C.-L.;
Appeared in: IEEE Transactions on Circuits and Systems II: Express Briefs
Publication date: Sep 2011, volume: 58, issue:9, pages: 550 - 554
Publisher: IEEE
 
» A 6-bit Fully Binary Digital-to-Analog Converter in 0.25- SiGe BiCMOS for Optical Communications
Abstract:
This paper presents an approach to implement a high-speed binary weighted digital-to-analog converter (DAC). A different current switching mechanism is proposed that improves the dynamic performance of binary weighted DACs. Circuit simulation shows an improvement of the rise (fall) time mismatch by a factor of 2 over the conventional structure. It is shown that in a conventional high-speed binary DAC implemented with differential pairs, the spurious-free dynamic range (SFDR) can be degraded by nearly 6 dB due to the different rise (fall) times of the current switches. Using the proposed current switches, a fully binary weighted DAC with nominal resolution of 6 bit has been fabricated in 0.25- SiGe technology. The measured SFDR is higher than 30.1 dBc up to 5.9-GHz input signal with a 13.4-GHz clock. The DAC can provide 1.1-V peak-to-peak differential output swing over 50 while dissipating 1050 mW. Full-scale 20%–80% fall time and 2% settling time are measured below 18 and 45 ps, respectively.
Autors: Khafaji, M.;Gustat, H.;Sedighi, B.;Ellinger, F.;Scheytt, J. C.;
Appeared in: IEEE Transactions on Microwave Theory and Techniques
Publication date: Sep 2011, volume: 59, issue:9, pages: 2254 - 2264
Publisher: IEEE
 
» A 78 102 GHz Front-End Receiver in 90 nm CMOS Technology
Abstract:
In this letter, a 78 102 GHz front-end receiver designed in 90 nm CMOS technology is presented. It consists of an ultra-wideband low-noise amplifier, a subharmonic mixer, and an IF buffer. This receiver has a peak gain of 11.8 dB at 94 GHz with the noise figure of 13.4 dB. The measured input-referred 1 dB compression point is 14.5 dBm and the total power dissipation is 18.6 mW. The chip size is .
Autors: Su, H.-Y.;Hu, R.;Wu, C.-Y.;
Appeared in: IEEE Microwave and Wireless Components Letters
Publication date: Sep 2011, volume: 21, issue:9, pages: 489 - 491
Publisher: IEEE
 
» A 90–240 MHz Hysteretic Controlled DC-DC Buck Converter With Digital Phase Locked Loop Synchronization
Abstract:
This paper reports a digital phase locked loop (D-PLL) based frequency locking technique for high frequency hysteretic controlled dc-dc buck converters. The proposed converter achieves constant operating frequency over a wide output voltage range, eliminating the dependence of switching frequency on duty cycle or voltage conversion range. The D-PLL is programmable over a wide range of parameters and can be synchronized to a clock reference to ensure proper frequency lock and switching operation outside undesirable power supply resonance bands. The stability and loop dynamics of the proposed converter is analyzed using an analog equivalent PLL behavioral model which describes the dc-dc converter as a voltage-controlled oscillator (VCO). We demonstrate a 90–240 MHz single phase converter with fast hysteretic control and output conversion range of 33%–80%. The converter achieves an efficiency of 80% at 180 MHz, a load response of 40 ns for a 120 mA current step and a peak-to-peak ripple less than 25 mV. The circuit was implemented in 130 nm digital CMOS process.
Autors: Li, P.;Bhatia, D.;Xue, L.;Bashirullah, R.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Sep 2011, volume: 46, issue:9, pages: 2108 - 2119
Publisher: IEEE
 
» A 90-nm CMOS Threshold-Compensated RF Energy Harvester
Abstract:
This paper presents an efficient energy harvester for RF-powered sensor networks. The circuit is based on an improved multi-stage rectifier, which exploits a fully passive threshold self-compensation scheme to overcome the limitation due to the input dead zone. A CAD-oriented design methodology is also proposed, which is aimed at maximizing the overall power conversion efficiency of the harvester through an optimum trade-off among matching losses, power reflection and rectifier efficiency. According to the proposed methodology, a 915-MHz harvester comprising an integrated input matching network and a 17-stage self-compensated rectifier has been designed and fabricated in a 90-nm CMOS technology. The rectifier exhibits a remarkably low input power threshold, as it is able to deliver a 1-V dc output voltage to a capacitive load with a very small input power of 24 dBm (4 W). When driving a 1-M load, the device can supply a 1.2-V output with an input power of 18.8 dBm (13.1 W). The achieved results exceed the performance of previously reported RF multi-stage rectifiers in standard analog CMOS technology.
Autors: Papotto, G.;Carrara, F.;Palmisano, G.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Sep 2011, volume: 46, issue:9, pages: 1985 - 1997
Publisher: IEEE
 
» A balanced output CMOS OTA with wide linear current tunable range
Abstract:
A new CMOS-based balanced output operational transconductance amplifier (BOTA) with very wide linear current tunable range is proposed in this paper. The design technique is achieved by the combination of a fully differential transconductor and an electronically variable current gain stage. The transconductance gain of the proposed BOTA can be linearly tuned by an external bias current for more than 4 decades, with less than 4% nonlinearity for the linear input-voltage range of about 0.2 Vpeak. The OTA is designed in 0.5 ?m AMIS technology. The performance of the proposed circuit is discussed and confirmed through application example and PSPICE simulation results.
Autors: Khanittha Kaewdang, Wanlop Surakampontorn
Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A battery-operated, stabilized, high-energy pulsed electron gun for the production of rare gas excimers
Abstract:
We report on the design of a new type of hot-filament electron gun delivering fairly high current (a few hundreds of μ A) at high voltage (up to 100 kV) in continuous or pulsed mode. Its novel features are that the filament is heated by means of a pack of rechargeable batteries floated atop the high-voltage power supply in order to get rid of bulky isolation transformers, and that the filament current and, hence, the electron gun current, is controlled by a feedback circuit including a superluminescent diode decoupled from the high voltage by means of an optical fiber. This electron gun is intended for general purposes, although we have especially developed it to meet the needs of our experiment on the infrared emission spectroscopy of rare gas excimers. Our experiment requires that the charge injection into the sample is pulsed and constant and stable in time. The new electron gun can deliver several tens of nC per pulse of electrons of energy up to 100 keV into the sample cell. The new design also eliminates ripples in the emission current and ensures up to 12 h of stable performance.
Autors: Barcellan, L.;Berto, E.;Carugno, G.;Galet, G.;Galeazzi, G.;Borghesani, A. F.;
Appeared in: Review of Scientific Instruments
Publication date: Sep 2011, volume: 82, issue:9, pages: 095103 - 095103-7
Publisher: IEEE
 
» A Bayesian Network Model for Automatic and Interactive Image Segmentation
Abstract:
We propose a new Bayesian network (BN) model for both automatic and interactive image segmentation. A multilayer BN is constructed from an oversegmentation to model the statistical dependencies among superpixel regions, edge segments, vertices, and their measurements. The BN also incorporates various local constraints to further restrain the relationships among these image entities. Given the BN model and various image measurements, belief propagation is performed to update the probability of each node. Image segmentation is generated by the most probable explanation inference of the true states of both region and edge nodes from the updated BN. Besides the automatic image segmentation, the proposed model can also be used for interactive image segmentation. While existing interactive segmentation (IS) approaches often passively depend on the user to provide exact intervention, we propose a new active input selection approach to provide suggestions for the user's intervention. Such intervention can be conveniently incorporated into the BN model to perform actively IS. We evaluate the proposed model on both the Weizmann dataset and VOC2006 cow images. The results demonstrate that the BN model can be used for automatic segmentation, and more importantly, for actively IS. The experiments also show that the IS with active input selection can improve both the overall segmentation accuracy and efficiency over the IS with passive intervention.
Autors: Zhang, L.;Ji, Q.;
Appeared in: IEEE Transactions on Image Processing
Publication date: Sep 2011, volume: 20, issue:9, pages: 2582 - 2593
Publisher: IEEE
 
» A bi-phase enabled serial acquisition system for remote processing of digitized ECG
Abstract:
image

Highlights

? Objective is to develop an offline remote ECG acquisition system using PSTN line. ? ECG samples are acquired by a standalone embedded system before bi-phase encoding. ? Decoding of ECG data at receive end is done by another embedded system. ? Data bytes are serially sent to PC for storage in file, graphical plot generation. ? A GUI is developed to perform operations on the PC using menus and icons.

Autors:

Graphical abstract

ECG signal acquisition from remote patients for diagnosis and clini
Appeared in: Computers & Electrical Engineering
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Bio-Inspired Quality of Service (QoS) Routing Algorithm
Abstract:
We propose in this letter a bio-inspired Quality of Service (QoS) routing algorithm that is based on the trial/error paradigm combined with a continuous adaptive function to optimize three QoS criteria: static cumulative cost path and dynamic end-to-end delay and residual bandwidth. Our proposed approach uses a model that combines a stochastic planned pre-navigation for the exploration phase and a deterministic approach for the backward phase. We adopt a unified framework of online learning to develop a cost function. We evaluated the performance of our QoS-routing algorithm and the simulation results demonstrate substantial performance improvements for networks with dynamically changing traffic.
Autors: Mellouk, Abdelhamid;Hoceini, Said;Zeadally, Sherali;
Appeared in: IEEE Communications Letters
Publication date: Sep 2011, volume: 15, issue:9, pages: 1016 - 1018
Publisher: IEEE
 
» A Biologically Inspired Architecture for an Autonomous and Social Robot
Abstract:
Lately, lots of effort has been put into the construction of robots able to live among humans. This fact has favored the development of personal or social robots, which are expected to behave in a natural way. This implies that these robots could meet certain requirements, for example, to be able to decide their own actions (autonomy), to be able to make deliberative plans (reasoning), or to be able to have an emotional behavior in order to facilitate human–robot interaction. In this paper, the authors present a bioinspired control architecture for an autonomous and social robot, which tries to accomplish some of these features. In order to develop this new architecture, authors have used as a base a prior hybrid control architecture (AD) that is also biologically inspired. Nevertheless, in the later, the task to be accomplished at each moment is determined by a fix sequence processed by the Main Sequencer. Therefore, the main sequencer of the architecture coordinates the previously programmed sequence of skills that must be executed. In the new architecture, the main sequencer is substituted by a decision making system based on drives, motivations, emotions, and self-learning, which decides the proper action at every moment according to robot's state. Consequently, the robot improves its autonomy since the added decision making system will determine the goal and consequently the skills to be executed. A basic version of this new architecture has been implemented on a real robotic platform. Some experiments are shown at the end of the paper.
Autors: Malfaz, M.;Castro-Gonzalez, Á.;Barber, R.;Salichs, M. A.;
Appeared in: IEEE Transactions on Autonomous Mental Development
Publication date: Sep 2011, volume: 3, issue:3, pages: 232 - 246
Publisher: IEEE
 
» A biomimetic reach and grasp approach for mechanical hands
Abstract:

Highlights

? We model a bioinspired architecture to control a full-actuated robotic hand. ? We present the way each sub-part has been designed. ? We validate our controller with the corresponding experimental site.


Autors: Reach and grasp are the two key functions of human prehension. The central nervous system controls these two functions in a separate but interdependent way. The choice between different solutions to reach and grasp an object - provided by multiple an
Appeared in: Robotics and Autonomous Systems
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Bipolar Vacuum Microelectronic Device
Abstract:
This report provides the first demonstration of a vacuum microelectronic device that utilizes both positive and negative charge states (i.e., a bipolar vacuum microelectronic device), thus enabling the possibility of device designs that are not previously possible in traditional vacuum microelectronics. In the same way that complimentary metal–oxide–semiconductor (complimentary n-channel MOS and p-channel MOS) were required in solid-state electronics before digital logic applications could be addressed, vacuum microelectronic devices benefit from a second charge state to realize many applications. This advance could enable integrated circuits for radiation-intensive environments (nuclear power facilities and space-based communications such as satellites) and high-temperature applications (engines and materials processing). A microelectromechanical systems platform was used to construct pentode structures with integrated carbon nanotube field emitters for electron emission and bias electrodes for separate electron- and ion-current modulation. Ions were generated via electron impact in an argon ambient, and devices were tested in both voltage sweep and pulsed modes. Current that is greater than 2 was modulated at the anode between ion and electron collection, demonstrating that this novel platform has the potential to foster a new class of bipolar vacuum microelectronics.
Autors: Stoner, B. R.;Piascik, J. R.;Gilchrist, K. H.;Parker, C. B.;Glass, J. T.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Sep 2011, volume: 58, issue:9, pages: 3189 - 3194
Publisher: IEEE
 
» A blind equalization algorithm for biological signals transmission
Abstract:
Direct transmission of biological signals such as electrocardiogram (ECG) and electroencephalogram (EEG) through mobile network provides practically unlimited movement of the patients and unlimited coverage area. However, transmission of such signals over a bandlimited channel or through a multipath propagation is subject to inter symbol interference (ISI), whereby adjacent symbols on the output of the channel smear and overlap each other causing degradation of error performance. Mitigation of such kind of distortion can be achieved through equalization filter. Recently an adaptive blind channel equalization using sinusoidally-distributed dithered signed-error constant modulus algorithm (DSE-CMA) has been proposed. In this paper we investigate the performance and the feasibility of this scheme for wireless ECG and EEG transmission. Also, this paper discusses the importance of adaptive blind equalizer for biological signals transmission over existing wireless networks such as Global System for Mobile Communications (GSM) and the Enhanced Data rates for GSM Evolution (EDGE). The geometrical-based hyperbolically distributed scatterers (GBHDS) channel model for macrocell environments was simulated with angular spreads (AS) taken from measurement data. Simulation results show that the low complexity of implementation and the fast convergence rate are the major advantages of deploying this scheme for telemedicine applications. It is also shown that the equalizer output signal is highly correlated with the original transmitted signal in time and joint time-frequency domains.
Autors: Seedahmed S. Mahmoud, Qiang Fang, Zahir M. Hussain, Irena Cosic
Appeared in: Digital Signal Processing
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Boosted Co-Training Algorithm for Human Action Recognition
Abstract:
This paper proposes a boosted co-training algorithm for human action recognition. To address the view-sufficiency and view-dependency issues in co-training, two new confidence measures, namely, inter-view confidence and intra-view confidence, are proposed. They are dynamically fused into a semi-supervised learning process. Mutual information is employed to quantify the inter-view uncertainty and measure the independence among respective views. Intra-view confidence is estimated from boosted hypotheses to measure the total data inconsistency of labeled data and unlabeled data. Given a small set of labeled videos and a large set of unlabeled videos, the proposed semi-supervised learning algorithm trains a classifier by maximizing the inter-view confidence and intra-view confidence, and dynamically incorporating unlabeled data into the labeled data set. To evaluate the proposed boosted co-training algorithm, eigen-action and information saliency feature vectors are employed as two input views. The KTH and Weizmann human action databases are used for experiments, average recognition accuracy of 93.2% and 99.6% are obtained, respectively.
Autors: Liu, C.;Yuen, P. C.;
Appeared in: IEEE Transactions on Circuits and Systems for Video Technology
Publication date: Sep 2011, volume: 21, issue:9, pages: 1203 - 1213
Publisher: IEEE
 
» A bottom-up approach for System-On-Chip reliability
Abstract:
We demonstrate here for the first time that it is possible by a bottom-up approach to build transistor- and gate-level models with enough accuracy to allow direct comparison with experimental degradations at system-level. This work opens new ways to optimize high level digital systems with respect to aging with great accuracy.
Autors: V. Huard, N. Ruiz, F. Cacho, E. Pion
Appeared in: Microelectronics Reliability
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A chaotic system based fragile watermarking scheme for image tamper detection
Abstract:
AbstractIn the past few years, various fragile watermarking techniques have been proposed for image authentication and tamper detection. In this paper, a novel chaos based watermarking scheme for image authentication and tamper detection is proposed. Tamper localization and detection accuracy are two important aspects of the authentication watermarking schemes. Our scheme can detect any modification made to the image and can also indicate the specific locations that have been modified. To improve the security of the proposed scheme two chaotic maps are employed. Since chaotic maps are sensitive to initial values, the corresponding position relation between pixels in the watermarked image and the watermark get disturbed, which helps the watermarking scheme to withstand counterfeiting attacks. Initial values of the chaotic maps are used as secret keys in our scheme. The effectiveness of the proposed scheme is checked through a series of attacks. Experimental results demonstrate that the proposed scheme is not only secure but also achieves superior tamper detection and localization accuracy under different attacks. For instance in copy-and-paste attack and collage attack.
Autors: Sanjay Rawat, Balasubramanian Raman
Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Circuit Simulation Method Based on Physical Approach for the Analysis of Mot_bal99lt1 p-i-n Diode Circuits
Abstract:
To simulate semiconductor devices and circuits working at high frequencies or under a large signal input and to better understand their physical effects, a physically based simulation method is proposed in this paper. It utilizes a physical-model-based field simulation to analyze the semiconductor devices in a circuit and incorporates the field simulation into an equivalent-model-based circuit simulation to simulate the circuit. For the field simulation, a genetic-algorithm-based curve-fitting approach is proposed to extract the parameters of the semiconductor devices’ physical models. The proposed method is employed for the analysis of a few circuits containing a commercial p-i-n diode with model number mot_bal99lt1. The feasibility and accuracy of the proposed method are validated through a comparison of its simulation results with the measurement data, and good agreement is observed. The other merits of the proposed method are also illustrated, including its ability to provide useful physical mechanisms for the better understanding of the behavior of the p-i-n diode under various working conditions.
Autors: Chen, X.;Chen, J.;Huang, K.;Xu, X.-B.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Sep 2011, volume: 58, issue:9, pages: 2862 - 2870
Publisher: IEEE
 
» A Closed-Form Approximation of the Exact Unbiased Inverse of the Anscombe Variance-Stabilizing Transformation
Abstract:
We presented an exact unbiased inverse of the Anscombe variance-stabilizing transformation in [M. Mäkitalo and A. Foi, “Optimal inversion of the Anscombe transformation in low-count Poisson image denoising,” IEEE Trans. Image Process., vol. 20, no. 1, pp. 99–109, Jan. 2011.] and showed that when applied to Poisson image denoising, the combination of variance stabilization and state-of-the-art Gaussian denoising algorithms is competitive with some of the best Poisson denoising algorithms. We also provided a MATLAB implementation of our method, where the exact unbiased inverse transformation appears in nonanalytical form. Here, we propose a closed-form approximation of the exact unbiased inverse in order to facilitate the use of this inverse. The proposed approximation produces results equivalent to those obtained with the accurate (nonanalytical) exact unbiased inverse, and thus, notably better than one would get with the asymptotically unbiased inverse transformation that is commonly used in applications.
Autors: Makitalo, M.;Foi, A.;
Appeared in: IEEE Transactions on Image Processing
Publication date: Sep 2011, volume: 20, issue:9, pages: 2697 - 2698
Publisher: IEEE
 
» A CMOS Voltage Controlled Oscillator and Frequency Tripler for 22 – 27 GHz Local Oscillator Generation
Abstract:
This letter presents a CMOS voltage-controlled oscillator (VCO) and frequency tripler integration for 22–27 GHz local oscillator (LO) generation. An 8 GHz wideband VCO provides the fundamental and second harmonic signals which are directly fed into the frequency tripler for frequency mixing. The tripler generates an output frequency in the range of 22–27 GHz. This integration is implemented and fabricated using a 0.18 CMOS process. The total chip area is 0.66 . The measured frequency tuning range (FTR) of the VCO increases from 7.28 to 9.11 GHz as the tuning voltage increases from 0 to 1.8 V. The output frequency range of the tripler covers a wide band of 5.5 GHz (22.4%) ranging from 21.83 to 27.33 GHz. Overall, the core circuits of this integration consume 11.1 mW. At a frequency offset of 1 MHz from the centre frequency, the measured phase noises of the VCO and frequency tripler are and , respectively. The calculated figure of merit with frequency tuning range is .
Autors: Tsai, P.-K.;Liu, C.-Y.;Huang, T.-H.;
Appeared in: IEEE Microwave and Wireless Components Letters
Publication date: Sep 2011, volume: 21, issue:9, pages: 492 - 494
Publisher: IEEE
 
» A common operator for FFT and FEC decoding
Abstract:
In the Software Radio context, the parametrization is becoming an important topic especially when it comes to multi-standard designs. This paper capitalizes on the common operator technique to present new common structures for the FFT and FEC decoding algorithms. A key benefit of exhibiting common operators is the regular architecture it brings when implemented in a Common Operator Bank (COB). This regularity makes the architecture open to future function mapping and adapted to accommodated silicon technology variability through dependable design.
Autors: Malek Naoues, Dominique Noguet, Laurent Alaus, Yves Louët
Appeared in: Microprocessors and Microsystems
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A compact AES core with on-line error-detection for FPGA applications with modest hardware resources
Abstract:
This paper presents a compact, low-cost, on-line error-detection architecture for a 32-bit hardware implementation of the AES. The implemented AES is specially designed for FPGA-based embedded applications, since it is tuned to specific FPGA logic resources. The on-line error-detection is based on parity codes. The parity prediction is implemented in the AES encryption, decryption, and key expansion process. The developed solution has been upgraded to an efficient BIST with a high fault coverage and a low hardware overhead.
Autors: Uro? Legat, Anton Biasizzo, Franc Novak
Appeared in: Microprocessors and Microsystems
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Compact Dual-Band 90° Coupler With Coupled-Line Sections
Abstract:
A new dual-band 90° coupler using coupled transmission lines is proposed in this paper. As the coupler consists of only three quarter-wave coupled-line sections, it occupies less circuit area as compared to other existing dual-band branch-line couplers. A desired dual-band operation can be achieved by proper design of the coupling level for those coupled-line sections. Moreover, the coupler's configuration contains a degree of freedom so that its design is “customizable,” allowing itself to be conveniently realized on a variety of circuit and substrate technologies. As a result, it is suitable for use in many practical applications.
Autors: Yeung, L. K.;
Appeared in: IEEE Transactions on Microwave Theory and Techniques
Publication date: Sep 2011, volume: 59, issue:9, pages: 2227 - 2232
Publisher: IEEE
 
» A Compact MIMO Array of Planar End-Fire Antennas for WLAN Applications
Abstract:
An approach to the design of multiple-input multiple-output (MIMO) arrays exploiting planar directive antennas is presented. It is well known that pattern orthogonality is a key aspect to reach low correlation, and thus to improve channel capacity in rich multipath environments. However, attention is often focused on reducing mutual coupling rather than optimizing the active element patterns. In this communication a planar MIMO array of printed Yagi-Uda antennas with integrated balun is presented. The end-fire radiation mechanism of the Yagi-Uda is exploited to obtain a triangular array of three sectoral antennas. This allows to achieve nearly orthogonal patterns, while keeping a low mutual coupling among radiating elements. A properly shaped ground at the feeding points allows to increase the isolation between the antennas, even in such a compact layout. A laboratory model has been characterized experimentally, and the effectiveness of the proposed design in terms of theoretical achievable capacity is demonstrated through numerical simulations considering IEEE 802.11n multipath fading channel models.
Autors: Capobianco, A.-D.;Pigozzo, F. M.;Assalini, A.;Midrio, M.;Boscolo, S.;Sacchetto, F.;
Appeared in: IEEE Transactions on Antennas and Propagation
Publication date: Sep 2011, volume: 59, issue:9, pages: 3462 - 3465
Publisher: IEEE
 
» A compact wideband fractal cantor antenna for wireless applications
Abstract:
A low cost, compact antenna is a new exemplar in communication. Fractal geometry, a concept in mathematics is adopted to design a miniaturized low profile fractal antenna. The size of the antenna is 38.734 mm × 28.757 mm × 1.6 mm. The antenna is designed in such a way to operate at ISM band, Bluetooth, IEEE 802.11 and IEEE802.15, PCS(1900), GSM lowerband, DCS, UMTS(2100) and WLAN wireless applications. The prototype of developed antenna exhibits wideband characteristics and provides a good agreement of returnloss (S11) -30 dB. Experimental returnloss has been compared with the one which is obtained using method of moments. The main objective of implementing self-similar fractal concept in antenna design makes it flexible in controlling the resonance and bandwidth. This paper is aimed at examining the self-similar concept of fractal geometry with modified approach for wideband characteristics. The prototype of the proposed model with a good agreement of return loss is reported.
Autors: G. Srivatsun, S. Subha Rani
Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A comparative study of jet formation and nanofiber alignment in electrospinning and electrocentrifugal spinning systems
Abstract:

Highlights

? Electrocentrifugal spinning is a powerful technique for spinning solution with extremely low viscosity. ? Electrocentrifugal spinning is a more suited technique for production of aligned nanofibers than electrospinning. ? The procedure of water jet formation and polymeric jet formation in electrocentrifugal spinning was considered in this study.


Autors: Electrocentrifugal spinning is a recently developed spinning system whose performance is still under investigation by researchers. In this study the process of jet formation in electrocentrifugal spinning is explored and compared to the same process
Appeared in: Journal of Electrostatics
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A comparison between the Denavit-Hartenberg and the screw-based methods used in kinematic modeling of robot manipulators
Abstract:
This paper aims to integrate didactically some engineering concepts to understand and teach the screw-based methods applied to the kinematic modeling of robot manipulators, including a comparative analysis between these and the Denavit-Hartenberg-based methods. In robot analysis, kinematics is a fundamental concept to understand, since most robotic mechanisms are essentially designed for motion. The kinematic modeling of a robot manipulator describes the relationship between the links and joints that compose its kinematic chain. To do so, the most popular methods use the Denavit-Hartenberg convention or its variations, presented by several author and robot publications. This uses a minimal parameter representation of the kinematic chain, but has some limitations. The successive screw displacements method is an alternative representation to this classic approach. Although it uses a non-minimal parameter representation, this screw-based method has some advantages over Denavit-Hartenberg. Both methods are here presented and compared, concerning direct/inverse kinematics of manipulators. The differential kinematics is also discussed. Examples of kinematic modeling using both methods are presented in order to ease their comparison.
Autors: C.R. Rocha, C.P. Tonetto, A. Dias
Appeared in: Robotics and Computer-Integrated Manufacturing
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A comparison of harvest index estimation methods of winter wheat based on field measurements of biophysical and spectral data
Abstract:

Highlights

? Nitrogen (N) fertilizer had a great effect on the harvest index (HI) of winter wheat. ? The fraction of water transpired after anthesis of winter wheat was not sensitive to the N deficiency. ? The relation between HI and the fraction of aboveground biomass accumulation after anthesis was uncertain. ? The ratio of the mean NDVI after anthesis to that of the pre-anthesis period was valuable in HI estimation. ? It gave a good accuracy in HI estimation of winter wheat just using the canopy NDVI data after anthesis.


Autors: Crop harvest index (HI) is a key parameter in grain yield simulation from indirect biomass estimates and varies with crop growth conditions. How to access the HI still remains an issue to be addressed. Several HI estimation techniques for wheat have
Appeared in: Biosystems Engineering
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A comprehensive study of MEMS behavior under EOS/ESD events: Breakdown characterization, dielectric charging, and realistic cures
Abstract:

Highlights

? The breakdown characterization of electrostatically actuated RFMEMS switches was carried out. ? The emitted electromagnetic field during the testing was analyzed to evaluate air-breakdown occurrence. ? Possible parasitic effects on the HBM testing of MEMS devices were investigated. ? A varistor based ESD protection structure was explored.


Autors: The breakdown characterization of both out- and in-plane electrostatically actuated RF-MEMS switches with air-gaps from 1.0 to 6.7 ?m was studied. The emitted electromagnetic field during the testing was analyzed, in order to have an indication of th
Appeared in: Journal of Electrostatics
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Comprehensive Understanding of the Erase of TANOS Memories Through Charge Separation Experiments and Simulations
Abstract:
We investigate and quantify the role played by electrons and holes during the erase operation of TANOS memories by means of charge separation experiments and physics-based simulations. Results demonstrate that electron emission via trap-to-band tunneling dominates the first part of the erase operation, whereas hole injection prevails in the remaining part of the transient. In addition, we show that the efficiency of the erase operation is high and constant mainly because of the high energy offset between nitride and alumina valence bands. Our results clearly identify the physical mechanisms responsible for TANOS erase and allow deriving some important guidelines for the optimization of this operation.
Autors: Padovani, A.;Arreghini, A.;Vandelli, L.;Larcher, L.;Van den bosch, G.;Pavan, P.;Van Houdt, J.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Sep 2011, volume: 58, issue:9, pages: 3147 - 3155
Publisher: IEEE
 
» A computer program for monitoring and controlling ultrasonic anemometers for aerodynamic measurements in animal buildings
Abstract:

Highlights

? The developed computer program solves the problem of timely inconsistent data transmission from the different USAs. ? The air speed is higher and more stable near to, or under the ceiling fans. ? The implementation of ceiling fans enhances the air movement and distribution throughout the barn.


Autors: Ultrasonic anemometers (USAs) are widely implemented in animal housing to measure the air velocity in different measuring points throughout the whole barn, which ultimately leads to determine the velocity fields and the air flow patterns drawing a cl
Appeared in: Computers and Electronics in Agriculture
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A confirmation-based geocast routing algorithm for street lighting systems
Abstract:
image

Highlights

? Instable wireless communication nature. ? Appropriated routing protocol for urban networks. ? Acknowledgment mechanism based on selecting other neighbors' nodes. ? Proposed protocol produces tolerated end-to-end delay values for this type of network.

Autors:

Graphical abstract

Appeared in: Computers & Electrical Engineering
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Consistent Charge Model of GaAs MESFETs for -Band Power Amplifiers
Abstract:
In this paper, a consistent gate charge model for GaAs MESFETs based upon charge conservation is proposed for monolithic microwave integrated circuit power amplifier designs. This new model is capable of accurately modeling the transistor under various biasing conditions. The conventional approaches for charge modeling of GaAs MESFETs usually adopt analytical equations to fit nonlinear gate capacitors separately, which might be difficult to implement in circuit simulators whose capacitance is always the derivative of an internal state variable (charge). Moreover, compared with the conventional diode and Statz model, the performance prediction in the linear region, saturation knee region, and subthreshold region is greatly improved. Measured and modeled results of a 2 150 GaAs MESFET are compared and good agreement has been obtained. Comparisons between the proposed model, diode junction model, and Statz model are also presented in this paper. In addition, a class-AB -band power amplifier using a 0.18- GaAs MESFET process was designed with the new model for verification of the new model accuracy.
Autors: Zhong, Z.;Guo, Y.-X.;Leong, M. S.;
Appeared in: IEEE Transactions on Microwave Theory and Techniques
Publication date: Sep 2011, volume: 59, issue:9, pages: 2246 - 2253
Publisher: IEEE
 
» A constructive speed observer design for general Euler-Lagrange systems
Abstract:
recently proved the existence of a globally exponentially convergent speed observer for general Euler-Lagrange systems. Key to their result, is a function defined by certain integrals which cannot be solved a priori, and may not have explicit analytic solutions. In this paper, this obstacle to a constructive design is removed and equations that solve the speed observer problem are given in closed form. The design is further simplified by removing up to one third of the observer states used in. With the significant reduction in complexity, the new observer is easily applied to estimate the angular velocities in a Furuta pendulum example.
Autors: Øyvind Nistad Stamnes, Ole Morten Aamo, Glenn-Ole Kaasa
Appeared in: Automatica
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Content-Based Dissemination Protocol for VANETs: Exploiting the Encounter Probability
Abstract:
This paper focuses on intelligent transportation systems and, more precisely, on intervehicle ad hoc networks. A vehicular ad hoc network (VANET) is a highly dynamic network as the vehicles communicate using short-range wireless communications and can move very quickly. Thus, for example, we can only rely on short interactions between vehicles to exchange information about relevant events. In this paper, we describe in detail a dissemination protocol that vehicles can use to share information by using vehicle-to-vehicle communications. The dissemination approach considers the relevance of the data, represented by what we call encounter probability, to decide when a rediffusion is needed. The protocol is able to disseminate data about any type of event in the network (e.g., available parking spaces, accidents or obstacles in the road, information about moving objects such as emergency vehicles that should get the right of way, etc.) by setting appropriate weights for the different factors that affect the computation of the encounter probability. An extensive experimental evaluation with different types of events shows the interest of the proposal: The vehicles receive the relevant messages in time, and the network overload is limited.
Autors: Cenerario, N.;Delot, T.;Ilarri, S.;
Appeared in: IEEE Transactions on Intelligent Transportation Systems
Publication date: Sep 2011, volume: 12, issue:3, pages: 771 - 782
Publisher: IEEE
 
» A context realization framework for ubiquitous applications with runtime support
Abstract:
Context awareness, as one of the key techniques applied in ubiquitous computing, makes information technology invisible and seamless to people's daily living. As a result, numerous context frameworks have been developed for simplifying the development of context-aware applications by providing low-level context data operations such as acquisitions and simple aggregations in terms of APIs or toolkits. These frameworks are still falling short in requiring developers to explicitly deal with context-related tasks such as constraint enforcement in the application code. In this article, we present a framework to bridge the gap. More specifically, an application context model (ACM) is proposed for developers to specify their requirements on the context-related tasks. At application runtime, the ACM is instantiated for automatic context realization by the application context engine (ACE), which supports the full life cycle of each ACM instance (initialization, execution, and termination). We validate the concept of the framework through a case study, and present the experimental results based on the system prototype.
Autors: Zhu, J.;Pung, H.K.;Oliya, M.;Wong, W.C.;
Appeared in: IEEE Communications Magazine
Publication date: Sep 2011, volume: 49, issue:9, pages: 132 - 141
Publisher: IEEE
 
» A continuous semi-empiric transfer characteristics model for surrounding gate undoped polysilicon nanowire MOSFETs
Abstract:

Highlights

? A continuous semi-empiric Lambert function-based compact model is proposed for the transfer characteristics of Poly-Si NW MOSFETs. ? It consists of a single analytically differentiable equation with only four parameters. ? Its adequacy is ascertained by comparing measured characteristics of experimental devices to model play-backs calculated using extracted parameters.


Autors: A new continuous semi-empiric compact model for the current transfer characteristics of surrounding gate undoped polycrystalline silicon (Poly-Si) nanowire (NW) MOSFETs is proposed. The model consists of a single equation based on the Lambert functio
Appeared in: Solid-State Electronics
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Continuously Tunable Hybrid LC-VCO PLL With Mixed-Mode Dual-Path Control and Bi-level Modulated Coarse Tuning
Abstract:
This paper presents a dual-path PLL using a hybrid VCO to perform digital based frequency acquisition and analog based bandwidth control. With the mixed-mode dual-path control, the proposed PLL significantly alleviates noise coupling and area problems in the coarse-tuning path while minimizing open-loop gain variation in the fine-tuning path. In the hybrid VCO design, the nonlinearity issue of the capacitor array is addressed and a 1-bit quantizer (bi-level) modulator is used to mitigate the problem. A 2 GHz PLL implemented in 0.18 CMOS exhibits less than 3.5% bandwidth variation and less than 2 dB in-band noise variation over entire tuning range under nominal condition at room temperature. It also shows that more than 30 dB spur reduction is achieved with the bi-level second-order single-loop modulator when the worst-case spur performance is compared with a second-order MASH modulator.
Autors: Sun, Y.;Qiao, J.;Yu, X.;Rhee, W.;Park, B.-H.;Wang, Z.;
Appeared in: IEEE Transactions on Circuits and Systems I: Regular Papers
Publication date: Sep 2011, volume: 58, issue:9, pages: 2149 - 2158
Publisher: IEEE
 
» A contribution to the mechanics and thermodynamics of surface growth. Application to bone external remodeling
Abstract:

Highlights

? Surface growth of biological tissues. ? Thermodynamic framework of surface growth. ? Material surface forces for growth based on a surface Eshelby stress. ? Ability to simulate bone growth and resorption. ? External remodeling based on mechanochemical coupling.


Autors: The surface growth of biological tissues is presently analyzed at the continuum scale of tissue elements, adopting the framework of the thermodynamics of surfaces. Growth is assumed to occur in a moving referential configuration (called the natural c
Appeared in: International Journal of Engineering Science
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Controller Design for Color Active-Matrix Displays Using Electrophoretic Inks and Color Filters
Abstract:
Color active-matrix electrophoretic display (AMEPD) is the inevitable trend for the applications of smart handheld reading devices such as E-books and E-news. This paper presents a normalized RGB color filter (CF) design which achieves 15.66% full white reflectance, 10.80 contrast ratio, and 5.01% of National Television System Committee (NTSC) color gamut. In addition, a new storage method with a minimized lookup table that significantly reduces the data storage space by 2n times of the conventional one, where n is the number of gray levels. The prototyped controller has connected to a 6” color AMEPD panel covered with the normalized RGB structured CF, and an excellent display quality has demonstrated the effectiveness of the proposed controller design.
Autors: Chi-Ming Lu;Chin-Long Wey;
Appeared in: Journal of Display Technology
Publication date: Sep 2011, volume: 7, issue:9, pages: 482 - 489
Publisher: IEEE
 
» A credit card sized self powered smart sensor node
Abstract:
This paper reports a self powered smart sensor node (also called 'smart tag') consisting of a piezoelectric vibration energy harvester, a power conditioning circuit, sensors and an RF transmitter. The smart tag has dimensions similar to a credit card and can be easily integrated into various applications such as the surface of the aircraft. The smart tag is powered by an integrated bimorph piezoelectric generator that extracts energy from ambient vibrations. The generator is fabricated using thick film printing technology. Experimentally, the generator produced a maximum RMS output power of 240 ?W when excited at vibration with a frequency of 67 Hz and peak amplitude of 0.4 g(3.9 m s). This generated power is sufficient to enable periodic sensing and transmission. Details of the experimental results of the piezoelectric generator and the power conditioning circuit are presented. Test shows that the waiting time of the system between two consecutive transmissions is around 800 s.
Autors: Dibin Zhu, Stephen P. Beeby, Michael J. Tudor, Nick R. Harris
Appeared in: Sensors and Actuators A: Physical
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Critical Role for Noncoding 5S rRNA in Regulating Mdmx Stability
Abstract:

Highlights

? 5S rRNA is a major component of Mdmx-associated complexes ? 5S rRNA acts as a natural inhibitor of Mdmx degradation by Mdm2 ? 5S rRNA knockdown induces Mdmx degradation and p53 activation ? 5S rRNA blocks Mdm2-mediated ubiquitination of Mdmx, but not of p53


Autors: Both p53 and Mdmx are ubiquitinated and degraded by the same E3 ligase Mdm2; interestingly, however, while p53 is rapidly degraded by Mdm2, Mdmx is a stable protein in most cancer cells. Thus, the mechanism by which Mdmx is degraded by Mdm2 needs fur
Appeared in: Automatica
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Cumulant-Based Investigation of the Impact of Secondary Users' Field Size on Spectrum-Sharing Opportunities
Abstract:
Previous works studied the effect of different system parameters on spectrum-sharing opportunities where secondary users access the spectrum of primary users (PUs). However, a parameter that has received little attention is the spatial size of the field of secondary users. Usually, the field size is assumed to be infinite. Using results developed for infinite fields might be too pessimistic, leading to missing spectrum-sharing opportunities. This paper studies the effect of field size on spectrum-sharing opportunities. We verify that asymptotic results obtained for infinite fields are applicable for finite but relatively large fields (when the radial depth of the field is much greater than the minimum distance to the PU) as well. We also demonstrate that, in some cases, however, asymptotic results are too pessimistic, hiding some spectrum-sharing opportunities. Moreover, this paper shows that, in certain situations, a small reduction in the field size may create spectrum-sharing opportunities, while in certain other situations, a huge increase in the field size may not eliminate spectrum-sharing opportunities. Our study is based on a cumulant-based characterization of the aggregate interference power generated by secondary users. A number of recent papers in literature have dealt with cumulants of the aggregate interference, but only under specific scenarios. We introduce a more comprehensive method to determine the cumulants under various system and channel conditions. These cumulants are utilized to understand the dynamics of the aggregate interference power, approximate its distribution, and, hence, investigate the spectrum-sharing opportunities.
Autors: Aljuaid, M.;Yanikomeroglu, H.;
Appeared in: IEEE Transactions on Vehicular Technology
Publication date: Sep 2011, volume: 60, issue:7, pages: 3490 - 3497
Publisher: IEEE
 
» A CuO nanowire infrared photodetector
Abstract:
The authors report the growth of CuO nanowires on an oxidized Cu wire and the fabrication of CuO infrared photodetector. By annealing the Cu wire at 500 °C in air for 2 hours, high density CuO nanowires with an average length of 1.2 ?m and an average diameter of 50 nm were successfully grown vertically on the CuO wire. Using an 808 nm laser diode as the excitation source, it was found that rise-time and fall-time of the fabricated CuO infrared photodetector were 15 and 17 sec, respectively, when measured in vacuum.
Autors: S.B. Wang, C.H. Hsiao, S.J. Chang, K.T. Lam, K.H. Wen, ...
Appeared in: Sensors and Actuators A: Physical
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A curved multimorph based electrothermal micromirror with large scan range and low drive voltage
Abstract:
We report a circular micromirror with a 1 mm aperture that has an optical scan range of 60° at 0.68 V applied voltage and 11 mW power input. The mirror is actuated by a semicircular aluminum (Al)-tungsten (W) electrothermal multimorph that bends and twists upon controlled Joule heating. W acts as an active layer of the multimorph and a resistive heater. The curved actuator design not only maximizes the efficiency of chip area usage, but also achieves high resonant frequency due to torsional stiffness encountered during beam deformation. The first three resonant modes of the micromirror are at 104 Hz, 400 Hz and 416 Hz, respectively. Two-dimensional (2D) optical scanning is demonstrated by using the second resonant mode. The low power consumption may be attributed to the use of a single actuator beam. Mirror-center shift produced by actuator bending and twisting partially compensate each other and this results in 1.6 times lower center-shift compared to previously reported straight multimorph based designs. Device fabrication involves surface and bulk micromachining on an SOI wafer.
Autors: Sagnik Pal, Huikai Xie
Appeared in: Sensors and Actuators A: Physical
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A damaged visco-plasticity model for pressure and temperature sensitive geomaterials
Abstract:
This study is primarily intended to describe the behaviour of non-associated geomaterials within the framework of thermodynamics. By postulating a free energy and a dissipation function, a pressure dependent constitutive model is derived. The model is then used to solve a coupled temperature-displacement problem where shear heating feedback, multiple creep mechanisms and their induced continuum damage are included. The results show that the frictional behaviour of geomaterials in the crust has a high influence on faults orientations. In addition, the model reveals that damage nucleates in the viscous temperature-sensitive lower crust.
Autors: A. Karrech, K. Regenauer-Lieb, T. Poulet
Appeared in: International Journal of Engineering Science
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A database system for power systems customers and energy efficiency programs
Abstract:

Research highlights

? Database for power systems and customers. ? Study of customers' energy behavior. ? Validation of efficiency measures.


Autors: In this paper the design and development of a database for the registration of power utilities' customers and their energy behavior are described. The database also includes the customers' devices and buildings, their demand curves, their tariffs, th
Appeared in: International Journal of Electrical Power & Energy Systems
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Depletion-Mode In–Ga–Zn–O Thin-Film Transistor Shift Register Embedded With a Full-Swing Level Shifter
Abstract:
We proposed and fabricated the shift register embedded with a full-swing level shifter employing the depletion-mode In–Ga–Zn–O thin-film transistors (IGZO TFTs). In the level shifter, two clock signals with 180 out of phase and one start signal were employed to obtain a full-swing output. Also, the depletion-mode IGZO TFTs in the shift register were successfully turned off by employing two low-voltage-level signals. The level shifter and the shift register consist of six TFTs and one capacitor, and 11 TFTs, respectively. The depletion-mode IGZO TFT shift register embedded with a level shifter exhibited a high-voltage output pulse without any distortion. The power consumption is 2.13 mW at a VGH of 20 V, a VGL1 of 10 V, and a clock frequency of 12.5 kHz.
Autors: Kim, B.;Choi, S. C.;Lee, J.-S.;Kim, S.-J.;Jang, Y.-H.;Yoon, S.-Y.;Kim, C.-D.;Han, M.-K.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Sep 2011, volume: 58, issue:9, pages: 3012 - 3017
Publisher: IEEE
 
» A discrete-time approach to impulse-based adaptive input shaping for motion control without residual vibration
Abstract:
Modifying a command or actuation signal by convolving it with a sequence of impulses is a useful technique for eliminating structural vibration in rest-to-rest motion of mechanical systems. This paper describes an adaptive discrete-time version of this approach where amplitude and timing of impulses are tuned during operation to match the system under control. Solutions giving zero residual vibration are formulated in terms of a quadratic cost function and constructed by iterative operations on measured sets of input-output data. The versatility of the approach is demonstrated by simulated test cases involving (1) amplitude optimization of impulses with fixed timings, (2) timing optimization of impulses with fixed amplitudes and (3) combined timing and amplitude optimization. The approach is model-free and directly applicable to multi-mode systems. Moreover, fast adaptation within a single rest-to-rest maneuver can be achieved.
Autors: Matthew O.T. Cole
Appeared in: Automatica
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A distributed impairment aware QoS framework for all-optical networks
Abstract:
Different physical impairments can occur in optical transmission systems. Impairments such as fiber nonlinear effects are dependent on network state and vary with traffic and topology changes. In all-optical networks, impairments can accumulate along a lightpath and cause significant signal degradations. It is important to consider these impairments and the corresponding degradations in the routing algorithm design to provide quality of service (QoS). We propose a distributed QoS framework to achieve traffic engineering and QoS assurance for all-optical networks. Analytical models and new algorithms are designed in the framework to predict lightpath signal quality in dynamic network environments. The framework has also been used to compare performance of several routing and wavelength assignment algorithms with impairments taken into account.
Autors: Wenhao Lin, Timothy Hahn, Richard S. Wolff, Brendan Mumey
Appeared in: Optical Switching and Networking
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A dual axis CMOS micromachined convective thermal accelerometer
Abstract:
We present a dual axis accelerometer made with a frontside bulk micromachining on a 0.35 ?m CMOS. The accelerometer is based on thermal convection where a central suspended hot plate creates a hot gas bubble. In-plane acceleration applied to the body will change the temperature distribution on the device, the latter being measured by four detectors containing six serially connected thermocouples. The paper will present the modelling of the device with a specific spherical model as well as measurements of sensitivity and linearity.
Autors: Alexandra Garraud, Alain Giani, Philippe Combette, Benoît Charlot, Mathieu Richard
Appeared in: Sensors and Actuators A: Physical
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A dual band-pass amplifier-filter circuit for simultaneous recording of spikes and local field potentials from live neuronal tissue using multielectrode arrays
Abstract:
The paper presents the design and test results of a novel circuit with dual band-pass filter for simultaneous recording of Local Filed Potentials and spikes from individual neurons. Single readout channel is built of an input AC-coupling circuit with the cut-off frequency below 0.1 Hz, a low noise preamplifier and two parallel band-pass filters with nominal bandwidths from 2 Hz to 100 Hz and from 200 Hz to 2 kHz. The design is optimized for low noise, high dynamic range, and low power dissipation. The circuit has been designed and manufactured in a 0.35 ?m CMOS process as a multichannel chip comprising also an analog multiplexer for serialization of the analog output signals.
Autors: W. D?browski, T. Fiutowski, P. Rydygier, P. Wi?cek
Appeared in: Microelectronics Journal
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A dynamic and quasi-centralized RWA method for optical fast circuit switching networks employing route pre-prioritization
Abstract:

Highlights

? We propose a new dynamic RWA algorithm for optical fast circuit switching networks. ? The algorithm utilizes statistical information and attains better load balancing. ? The algorithm can be performed in a quasi-centralized manner. ? We elucidated that the algorithm matches the performance of a centralized RWA algorithm.


Autors: We propose a new dynamic RWA algorithm for optical fast circuit switching networks, agile optical networks that can accommodate changing broadband demands. The algorithm utilizes pre-computed prioritized route candidates that reflect statistical info
Appeared in: Optical Switching and Networking
Publication date: Sep 2011
Publisher: Elsevier B.V.
 
» A Dynamic Feedforward Neural Network Based on Gaussian Particle Swarm Optimization and its Application for Predictive Control
Abstract:
A dynamic feedforward neural network (DFNN) is proposed for predictive control, whose adaptive parameters are adjusted by using Gaussian particle swarm optimization (GPSO) in the training process. Adaptive time-delay operators are added in the DFNN to improve its generalization for poorly known nonlinear dynamic systems with long time delays. Furthermore, GPSO adopts a chaotic map with Gaussian function to balance the exploration and exploitation capabilities of particles, which improves the computational efficiency without compromising the performance of the DFNN. The stability of the particle dynamics is analyzed, based on the robust stability theory, without any restrictive assumption. A stability condition for the model is derived, which ensures a satisfactory global search and quick convergence, without the need for gradients. The particle velocity ranges could change adaptively during the optimization process. The results of a comparative study show that the performance of the proposed algorithm can compete with selected algorithms on benchmark problems. Additional simulation results demonstrate the effectiveness and accuracy of the proposed combination algorithm in identifying and controlling nonlinear systems with long time delays.
Autors: Han, M.;Fan, J.;Wang, J.;
Appeared in: IEEE Transactions on Neural Networks
Publication date: Sep 2011, volume: 22, issue:9, pages: 1457 - 1468
Publisher: IEEE
 

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