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Annual Northeast Bioengineering Conference

作者： Zhaoxin Yin Yih-Choung Yu Schettino, Luis Department of Electrical and Computer Engineering Lafayette College Easton PA USA Neuroscience Program Lafayette College Easton PA USA

A wearable device was developed to study the human grasping behavior. This device includes a custom-made glove with conductors at finger tips to detect the finger contact signals, a simple electronic circuit to enhance the signal quality, and a real-time data acquisition system to synchronize the acquisition of the finger contact signals with obtaining the optical marker signals in a motion capture system. A preliminary study shows that the new device is capable of detecting the moments of finger-object contacts with better resolution of time than the existing motion capture camera system by three orders of magnitude. This new device will be intensively used in experiments to understand human grasping.

关键词： Fingers Grasping Timing Data acquisition Humans Cameras Force

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On the ergodic secrecy capacity of the wiretap channel under imperfect main channel estimation

On the ergodic secrecy capacity of the wiretap channel under...

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Asilomar Conference on Signals, Systems & computers

作者： Zouheir Rezki Ashish Khisti Mohamed-Slim Alouini Electrical Engineering Program Physical Science and Engineering Division King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Electrical and Computer Engineering Department University of Toronto Toronto ONT Canada

ISBN: (纸本)9781467303217

The ergodic secrecy capacity of the wiretap channel is known when the main channel (between the transmitter and the legitimate receiver) state information (CSI) is perfect at the transmitter and the coherence period is sufficiently large to enable random coding arguments in each block. In a fast fading scenario, when the codeword length spans many coherence periods, the secrecy capacity is still not known. In this paper, we present a framework that characterizes this secrecy capacity under imperfect main channel estimation at the transmitter. Inner and outer bounds on the ergodic secrecy capacity are derived for a class of independent identically distributed (i.i.d.) fading channels. The achievable rate is a simple on-off scheme using a Gaussian input. The upper bound is obtained using an appropriate correlation scheme of the main and the eavesdropper channels. The upper and the lower bounds coincide with recently derived ones in the perfect main CSI extreme. Furthermore, the lower bound matches the upper bound in no main CSI extreme, where the secrecy capacity is equal to zero. Numerical results are provided for independent identically distributed (i.i.d.) Rayleigh fading channels.

关键词： Integrated circuits Channel estimation Signal to noise ratio Cryptography Antennas

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An optical-coding method for scattering signal detection in microfluidic cytometers

An optical-coding method for scattering signal detection in ...

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15th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2011, MicroTAS 2011

作者： Wu, T.-F. Mei, Z. Pion-Tonachini, L. Zhao, C. Qiao, W. Arianpour, A. Lo, Y.-H. Materials Science and Engineering Program University of California at San Diego San Diego CA 92093-0418 United States Department of Electrical and Computer Engineering University of California at San Diego San Diego CA 92093-0407 United States School of Information and Electronics Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9781618395955

In this article, we demonstrated an optical-coding method to detect forward scattering and large angle scattering signals within microfluidic devices. Using silicon photodetectors, we can effectively discriminate the mixture of unlabelled beads and obtain the spatial distribution of beads. The optical coding method improves the signal-to-noise and particle differentiation abilities for lab-on-a-chip flow cytometers. Copyright © (2011) by the Chemical and Biological Microsystems Society.

关键词： Microfluidics

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The Algebraic Reconstruction Technique of Lambert-Beer's attenuation approximation for parallel rays transmission projection

The Algebraic Reconstruction Technique of Lambert-Beer's att...

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International Conference on electrical engineering and Informatics, ICEEI

作者： M. Amin D. Sudiana D. Gunawan Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok West Java Indonesia Computer Engineering Study Program Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java Indonesia

The Algebraic Reconstruction Technique (ART) of Lambert-Beer's attenuation approximation for parallel rays transmission projection is a variant of the ART model that aims to solve image reconstruction problems in nuclear based computed tomography for non-destructive testing where γ or κ radiation is used as a ray source. In this model, the path length of the ray that hits a pixel at any projection view and the size of detector grid are explicitly included in computation. Then, the model is used to investigate the influence of the ray path length and the width of detector grid in producing image quality. The image quality is represented as space and pixel resolution, respectively. In this paper, we demonstrate that the model is able to show the contribution of the ray path length and detector grid in producing image quality. By considering ray path length and detector grid, the model produces smaller Root Mean Square error compared to conventional ART.

关键词： Attenuation Detectors Subspace constraints Image reconstruction Image resolution X-ray imaging Image segmentation

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Metamorphic solar cells employing chemical mechanical polishing and MOVPE regrowth

Metamorphic solar cells employing chemical mechanical polish...

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37th IEEE Photovoltaic Specialists Conference, PVSC 2011

作者： Mawst, L.J. Dudley, P. Kirch, J. Kim, T. Ruder, S. Kuech, T.F. Tatavarti, R. Department of Electrical and Computer Engineering University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States Materials Science Program University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States Department of Chemical and Biological Engineering University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States MicroLink Devices Inc. Niles IL United States

ISBN: (纸本)9781424499656

We have investigated the MOVPE growth of InxGa1-xAs metamorphic buffer layer (MBL) structures with a focus on techniques to improve the surface morphology and determine the influence of morphology on subsequently grown single-junction device structures. To improve the surface roughness of the underlying MBL, Chemical-Mechanical Polishing (CMP) is employed and MOVPE regrowth of single-junction (SJ) solar cells on top of the polished surface is performed. AFM image analysis indicates the CMP process is effective in reducing the step-graded InxGa1-xAs MBL surface roughness from ∼7-10 nm (as-grown) to 2.3 nm post CMP. A post-CMP ozone/HF treatment was found to be effective in removing silica residue remaining on the surface from the CMP process, allowing for the growth of films on top of the MBL surface subjected to CMP. Improved short circuit current density (Jsc) and external quantum efficiency (QE) were obtained from SJ (1eV) devices which employ the CMP process compared with those on as-grown MBLs. © 2011 IEEE.

关键词： Chemical mechanical polishing

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Multi-Tier Network Performance Analysis Using a Shotgun Cellular System

Multi-Tier Network Performance Analysis Using a Shotgun Cell...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Prasanna Madhusudhanan Juan G. Restrepo Youjian Liu Timothy X. Brown Kenneth R. Baker Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO USA Department of Applied Mathematics University of Colorado Boulder CO USA Department of Electrical Computer and Energy Engineering Interdisciplinary Telecommunications Program University of Colorado Boulder CO USA Interdisciplinary Telecommunications Program University of Colorado Boulder CO USA

This paper studies the carrier-to-interference ratio (CIR) and carrier-to-interference-plus-noise ratio (CINR) performance at the mobile station (MS) within a multi-tier network composed of M tiers of wireless networks, with each tier modeled as the homogeneous n-dimensional (n-D, n=1,2, and 3) shotgun cellular system, where the base station (BS) distribution is given by the homogeneous Poisson point process in n-D. The CIR and CINR at the MS in a single tier network are thoroughly analyzed to simplify the analysis of the multi-tier network. For the multi-tier network with given system parameters, the following are the main results of this paper: (1) semi-analytical expressions for the tail probabilities of CIR and CINR; (2) a closed form expression for the tail probability of CIR in the range [1,infinity); (3) a closed form expression for the tail probability of an approximation to CINR in the entire range [0,infinity); (4) a lookup table based approach for obtaining the tail probability of CINR, and (5) the study of the effect of shadow fading and BSs with ideal sectorized antennas on the CIR and CINR. Based on these results, it is shown that, in a practical cellular system, the installation of additional wireless networks (microcells, picocells and femtocells) with low power BSs over the already existing macrocell network will always improve the CINR performance at the MS.

关键词： Fading Noise Approximation methods Random variables Closed-form solutions Macrocell networks Femtocells

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Responses of human fetal mesenchymal stem cells to various poly(Ε-caprolactone) films: A comparison study

Responses of human fetal mesenchymal stem cells to various p...

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2011 Defense Science Research Conference and Expo, DSR 2011

作者： Wang, Zu-Yong Jing, Lim Zhang, Qin-Yuan Teo, Erin Y. Chan, Jerry Hong, Ming-Hui Wen, Feng Teoh, Swee-Hin Department of Mechanical Engineering National University of Singapore Singapore Department of Obstetrics and Gynaecology National University of Singapore Singapore Department of Reproductive Medicine KK Women's and Children's Hospital Singapore Cancer and Stem Cell Biology Program Duke-NUS Graduate Medical School Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore School of Material Science and Engineering Nanyang Technology University Singapore National University of Singapore Singapore

ISBN: (纸本)9781424492763

Poly(Ε-caprolactone) (PCL) films have been applied for vascular tissue engineering. However, few studies studied the effects of fabrication process of PCL film on vascular cell proliferation. In this study, we used different processing methods, incorporating stretching, to fabricate various PCL films. Thickness of films before and after stretch and proliferation ability of human fetal mesenchymal stem cells (hfMSCs) on these films were investigated. Our results showed that stretching significantly reduces the thickness of solvent cast, heat press and cast stretch films (0.22, 0.59, 0.60, p

关键词： Cell proliferation

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GaN-Based Neutron Scintillators with a 6 LiF Conversion Layer

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MRS Online Proceedings Library 2011年第1期1396卷 130-133页

作者： Andrew G. Melton Eric Burgett Nolan Hertel Ian T. Ferguson Department of Electrical and Computer Engineering University of North Carolina at Charlotte Charlotte USA Nuclear Engineering Program Idaho State University Pocatello USA Nuclear Engineering and Radiological Engineering Program George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta USA

Thin film gallium nitride (GaN) scintillators have been produced by MOCVD and made neutron-sensitive by applying an enriched lithium-6 fluoride (6LiF) conversion layer. The 6Li(n,α) reaction produces both alpha and triton particles, which have very penetration depths in GaN. The range and energy deposition characteristics of these particles in GaN have been simulated. Alpha-induced scintillation was measured in silicon-doped GaN using an americium-241 (241Am) source. The thermal neutron responses of the 6LiF-coated GaN scintillator were tested using two thermal neutron sources, an 241Am-Be source inside a graphite pile and a reactor source. The scintillator was found to have a linear response to thermal neutron flux level over a range of more than three orders of magnitude.

关键词： Ga neutron irradiation nitride

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Integration of Multilayers in Er-Doped Porous Silicon Structures and Advances in 1.5 μm Optoelectronic Devices

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MRS Online Proceedings Library 2011年第1期536卷 135-140页

作者： H. A. Lopez S. Chan L. Tsybeskov H. Koyama V. P. Bondarenko P. M. Fauchet Materials Science Program University of Rochester Rochester USA Department of Electrical and Computer Engineering University of Rochester Rochester USA Belarusian State University of Informatics and Radioelectronics Minsk Belarus

Infrared photoluminescence (PL) and electroluminescence (EL) from erbium-doped porous silicon (PSi) structures are studied. The PL and EL from the Er-doped PSi structures and the absence of silicon band edge recombination, point defect, and dislocation luminescence bands suggest that the Er-complex centers are the most efficient recombination sites. PSi multilayers with very high reflectivity (R ≥ 90%) in the 1.5 gim range have been incorporated in the structures resulting in a PL enhancement of over 100%. Stable and intense EL is obtained from the Er-doped structures. The EL spectrum is similar to that of the PL, but shifted towards higher energy. The unexpected shift in emission opens up the possibility for erbium related luminescence to encompass a larger part of the optimal wavelength window for fiber optic communications.

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Effect of STATCOM on the low-voltage-ride-through capability of Type-D wind turbine generator

Effect of STATCOM on the low-voltage-ride-through capability...

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IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： A. M. Shiddiq Yunus Mohammad A. S. Masoum A. Abu-Siada Department of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujungpandang Makassar Indonesia Department of Electrical nd Computer Engineering Curtin University Perth WA Australia

Variable speed wind turbine with full scale converter or so-called Type-D wind turbine generator worldwide installation has been significantly increased in the last few years. Voltage sag in the grid side may cause the wind turbine to be disconnected from the grid. In this paper, effect of STATCOM on the low voltage ride through capability of Type-D wind turbine during voltage sag in the grid side is studied. Simulation is carried out using MATLAB/Simulink software. Results show that STATCOM can significantly improve the voltage profile at the Point of Common Coupling (PCC) and improve the capability of Type-D wind turbine and prevents it from being disconnected from the grid during certain level of voltage sag in the grid side.

关键词： Automatic voltage control Wind turbines Voltage fluctuations Educational institutions Reactive power Power system stability

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