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2013 5th IEEE Electric Ship Technologies Symposium, ESTS 2013

作者： Prempraneerach, P. Angle, M.G. Kirtley Jr., J.L. Karniadakis, G.E. Chryssostomidis, C. Mechanical Engineering Department Rajamangala University of Technology Thunyaburi Pathumthani 12110 Thailand Electrical Engineering and Computer Science Department Research Laboratory for Electronics MIT Cambridge MA 02139 United States Division of Applied Mathematics Brown University Providence RI 02912 United States MIT Sea Grant College Program Department of Mechanical Engineering MIT Cambridge MA 02138 United States

ISBN: (纸本)9781467352437

DC faults may cause severe disruptions in continuity of service to vital loads in a shipboard integrated power system, hence detection, isolation, and protection against such faults must be incorporated in both medium-voltage DC (MVDC) and low-voltage DC (LVDC) systems. Here we consider the effectiveness of existing z-source breakers and propose several new designs more appropriate for fault detection in MVDC and LVDC systems. In particular, we perform an optimization study that aims to minimize dissipation and weight and we identify the key parameters for use in MVDC and LVDC systems. Preliminary verification and validation studies are also included. © 2013 IEEE.

关键词： Electric circuit breakers

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Periodic dynamics, localization metastability, and elastic interaction of colloidal particles with confining surfaces and helicoidal structure of cholesteric liquid crystals

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Physical Review E 2014年第6期90卷 062502-062502页

作者： Michael C. M. Varney Qiaoxuan Zhang Mykola Tasinkevych Nuno M. Silvestre Kris A. Bertness Ivan I. Smalyukh Department of Physics University of Colorado at Boulder Boulder Colorado 80309 USA Materials Science and Engineering Program University of Colorado at Boulder Boulder Colorado 80309 USA Max-Planck-Institut für Intelligente Systeme D-70569 Stuttgart Germany Institut für Theoretische Physik IV Universität Stuttgart D-70569 Stuttgart Germany Centro de Física Teórica e Computacional and Faculdade de Ciências da Universidade de Lisboa Av. Prof. Gama Pinto 2 1649-003 Lisboa Portugal National Institute of Standards and Technology Boulder Colorado 80305 USA Department of Electrical Computer and Energy Engineering and Liquid Crystals Materials Research Center University of Colorado at Boulder Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado at Boulder Boulder Colorado 80309 USA

Nematic and cholesteric liquid crystals are three-dimensional fluids that possess long-range orientational ordering and can support both topological defects and chiral superstructures. Implications of this ordering remain unexplored even for simple dynamic processes such as the ones found in so-called “fall experiments,” or motion of a spherical inclusion under the effects of gravity. Here we show that elastic and surface anchoring interactions prompt periodic dynamics of colloidal microparticles in confined cholesterics when gravity acts along the helical axis. We explore elastic interactions between colloidal microparticles and confining surfaces as well as with an aligned ground-state helical structure of cholesterics for different sizes of spheres relative to the cholesteric pitch, demonstrating unexpected departures from Stokes-like behavior at very low Reynolds numbers. We characterize metastable localization of microspheres under the effects of elastic and surface anchoring periodic potential landscapes seen by moving spheres, demonstrating the important roles played by anchoring memory, confinement, and topological defect transformation. These experimental findings are consistent with the results of numerical modeling performed through minimizing the total free energy due to colloidal inclusions at different locations along the helical axis and with respect to the confining substrates. A potential application emerging from this work is colloidal sorting based on particle shapes and sizes.

关键词： CHOLESTERIC liquid crystals LIQUID crystals ENANTIOSELECTIVE catalysis HELICAL waveguides GRAVITY

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Low-power signal processing methodologies for implantable biosensing platforms

Low-power signal processing methodologies for implantable bi...

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IEEE Signal Processing in Medicine and Biology Symposium (SPMB)

作者： Robert A. Croce Santhisagar Vaddiraju Allen Legassey Syed K. Islam Fotios Papadimitrakopoulos Faquir C. Jain Department of Electrical and Computer Engineering University of Connecticut CT USA Dept. of Chemistry University of Connecticut CT USA Technology Incubation Program Biorasis Inc. CT USA Department of Electrical Engineering and Computer Science University of Tennessee Knoxville TN USA

This paper presents the design and implementation of highly-miniaturized, low-power CMOS signal conditioning schemes intended for use in a totally implantable biomedical sensor platform. Due to the thrust for the development implantable biomedical sensing systems for health management and disease prevention, there exists a need for signal processing schemes which occupy very little on-chip real estate and consume negligible amounts of power. In light of this, this paper presents both a CMOS current-to-frequency converter and voltage-to-frequency converter which have been designed primarily for use in implantable biosensing platforms and applications. Such designs can be implemented in stand-alone single sensor designs, or in tandem to create multi-analyte architectures. The versatility of employing current-to-frequency as well as voltage-to-frequency signal transduction schemes presents an avenue for the integration with any electrochemical sensing element which has been fabricated in an amperometric or voltammetric fashion. Furthermore, we demonstrate the efficacy of both these circuit designs by integrating them together with high performance electrochemical implantable glucose and pH sensors. The low power consumption and miniature size of the amperometric and voltammetric signal processing units (0.25 mm 2 and 18 μW / 0.045 mm 2 and 122 μW, respectively) presents an ideal design for signal processing in implantable continuous metabolic monitoring devices.

关键词： Monitoring Biomedical monitoring Educational institutions CMOS integrated circuits Microelectronics Current measurement Sugar

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Band classification based on chromosome shapes

Band classification based on chromosome shapes

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Biomedical engineering International Conference (BMEiCON)

作者： Ravi Uttamatanin Peerapol Yuvapoositanon Apichart Intarapanich Saowaluck Kaewkamnerd Sissades Tongsima The Electrical Engineering Graduate Program Mahanakorn University of Technology Bangkok Thailand National Electronics and Computer Technology Center Pathum thani Thailand Electronic Engineering Department Mahanakorn University of Technology Bangkok Thailand National Center for Genetic Engineering and Biotechnology Pathum thani Thailand

For an automatic chromosome classification, band resolution information is required in order to perform diagnosis on numerical and structural abnormalities. Metaphases with low band resolution are normal used for numerical abnormality analysis while metaphases with high band resolution are used for structural abnormality analysis. In our work, we classify metaphases into low and high band resolution groups using chromosome shape. This band classification task can automatically perform without human intervention leading to faster the diagnosis process. The results showed that chromosome shape information is able to classify metaphases into low and high band resolution groups with the accuracy of 73.08% and 95.24%, respectively.

关键词： Biological cells Image resolution Probability density function Shape Accuracy Image segmentation Microscopy

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Design of Low Input and High Output Impedance Current-mode Biquad Filter Using CDTAs with Independent Control of Quality Factor and Pole Frequency

Design of Low Input and High Output Impedance Current-mode B...

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International Symposium on Communications and Information Technologies

作者： Somsak Sattanaco Winai Jaikla Piya Supavarasuwat Wipobh Jaikhang Electrical Communication Engineering Faculty of Industrial Education King Mongkut's Institute of Technology Ladkrabang Bangkok 10520Thailand Program in electronic & Computer Engineering Faculty of Industrial Technology Chiangrai Rajabhat University Chiangrai 57100 Thailand

ISBN: (纸本)9781467355797

In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current differencing transconducatance amplifier (CDTA) is presented. The proposed filter uses two CDTAs, one resistor and two grounded capacitors, which is well suited for integrated circuit implementation. The circuit simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of IHP and ILP, the notch filter can be also achieved. Moreover, the circuit possesses low input and high output impedance which would be an ideal choice for current-mode cascading. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation.

关键词： current-mode CDTA filter integrated circuit analog circuit

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Outage analysis of spectrum sharing relay systems with multi-secondary destinations in the presence of primary user's interference

Outage analysis of spectrum sharing relay systems with multi...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Yuzhen Huang Fawaz Al-Qahtani Caijun Zhong Qihui Wu College of Communications Engineering PLA University of Science and Technology Nanjing China Electrical and Computer Engineering Program Texas A&M University at Qatar Doha Qatar Institute of Information and Communication Engineering Zhejiang University Hangzhou China

This paper investigate the impact of primary transceivers on the outage performance of a dual-hop decode-and-forward (DF) spectrum sharing relay system with multiple secondary user (SU) destinations in Nakagami-m fading channels. To doing so, we derive new exact and asymptotic closed-form expressions for the outage probability of spectrum sharing relay systems employing the opportunistic scheduling algorithm, which readily enable us to characterize the impact of various key system parameters on the outage performance of the system. Monte Carlo simulation results are provided to verify the theoretical analysis and evaluate the effects of channel fading severity, SU relay placement, and number of SU destinations. The finding of this paper suggests that the interference temperature constraint results in the outage saturation phenomenon and zero diversity gain of spectrum sharing relay systems.

关键词： Interference Relays Materials requirements planning Fading Transmitters Monte Carlo methods Signal to noise ratio

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A low power miniaturized CMOS-based continuous glucose monitoring system

A low power miniaturized CMOS-based continuous glucose monit...

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2013 IEEE International Conference on Body Sensor Networks, BSN 2013

作者： Croce Jr., Robert A. Vaddiraju, Santhisagar Legassey, Allen Wang, Yan Burgess, Diane Papadimitrakopoulos, Fotios Jain, Faquir C. Biorasis Inc. Technology Incubation Program Storrs CT 06269 United States Department of Pharmaceutical Sciences University of Connecticut Storrs CT 06269 United States Dept. of Chemistry Institute of Materials Science University of Connecticut Storrs CT 06269 United States Department of Electrical and Computer Engineering University of Connecticut Storrs CT 06269 United States

ISBN: (纸本)9781479903306

This paper presents the design and fabrication of a highly-miniaturized system for continuous glucose monitoring which holds great promise for patients inflicted with diabetes mellitus. To achieve the realization of a truly implantable system, a variety of issues such as robust electrochemical sensor design, miniaturization of the electronic components and counteracting biofouling and negative tissue response need to be addressed. In this report, we present a highly-miniaturized transcutaneous continuous glucose monitoring system which holistically addresses the aforementioned tribulations associated with implantable devices. Specifically, a high performance amperometric electrochemical glucose sensor is integrated with custom designed complementary metal-oxide-semiconductor electronics. The fabricated electrochemical sensor is Clark-based, and employs stratification of five functional layers to achieve a linear response within the physiological range of glucose concentration (2-22 mM). Furthermore, the sensor is encased with a thick polyvinyl alcohol (PVA) hydrogel containing poly(lactic-co-glycolic acid) (PLGA) microspheres which provides continuous, localized delivery of dexamethasone utilized to combat inflammation and fibrosis. Such miniature size (0.665 mm2) and low power operation (140 μW) of the electronic system render it ideal for continuous glucose monitoring devices and other metabolic sensing systems. © 2013 IEEE.

关键词： CMOS integrated circuits

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Recent Advances in Detection of Ochratoxin-A

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Open Journal of Applied Biosensor 2013年第1期2卷 1-11页

作者： Ajeet Kaushik Sunil K. Arya Abhay Vasudev Shekhar Bhansali Bioelectronics Program Institute of Microelectronics A*STAR (Agency for Science Technology and Research) 11 Science Park Road Singapore Science Park II Singapore 117685 Singapore Bio-MEMS and Microsystems Lab Department of Electrical and Computer Engineering Florida International University Miami USA Bio-MEMS and Microsystems Lab Department of Electrical and Computer EngineeringFlorida International University Miami USA Department of Biomedical Engineering Florida International University Miami USA

Ochratoxin-A[7-(L-β-phenylalanylcarbonyl)-carboxyl-5-chloro-8-hydroxy-3,4-dihydro-3R-methyl-isocumarin, OTA] is a common food contaminant mycotoxin that enters the human body through the consumption of improperly stored food products. Upon ingestion, it leads to immuno-suppression and immuno-toxicity. OTA has been known to produce nephrotoxic, teratogenic, and carcinogenic activity (via oxidative DNA damage) in several species. This review introduces potentials of electrochemical biosensor to provide breakthroughs in OTA detection through improved selectivity and sensitivity and also the current approaches for detecting OTA in food products.

关键词： Biopolymer Mycotoxins Ochratoxin-A Chitosan Organic-Inorganic Hybrid Nanocomposite Biosensors

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Available bandwidth-aware cell selection for expanded regions of small cells adopting ABS

Available bandwidth-aware cell selection for expanded region...

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International Conference on Information and Communication technology Convergence (ICTC)

作者： Mncedisi Bembe Jeongchan Kim Thomas Olwal Youngnam Han Global Information and Telecommunication Technology Program KAIST Daejeon Republic of Korea Department of Electrical Engineering and Computer Science KAIST Daejeon Republic of Korea Meraka Institute CSIR Pretoria South Africa

ISBN: (纸本)9781479906963

Cell selection in current LTE-Advanced depend on reference signal received power or reference signal received quality which results to low user association probability. Therefore, we propose an aggregate objective cell selection technique based on enhanced inter-cell interference coordination technique developed by 3GPP in Rel-10 known as almost blank subframe. We also adopt the use of cell range expansion technique as means to encourage offloading. Cell range expansion was introduced in LTE-advanced, it encourages user equipment to select a small cell with a weakest signal as thier serving cell by adding a positive bias in cell selection process. Simulation shows that the proposed scheme results to high user association probability, while giving superior performance in average throughput compared to conventional single objective base cell selection for cell range expansion.

关键词： Interference Macrocell networks Bandwidth Linear programming Gain Long Term Evolution Base stations

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Enhanced SWEET protocol for energy efficient wireless sensor networks

Enhanced SWEET protocol for energy efficient wireless sensor...

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International Conference on Information and Communication technology Convergence (ICTC)

作者： Gcina Dludla Mncedisi Bembe Thomas Olwal Jun Kyun Choi KAIST Global Information and Telecommunication Technology Program Daejeon Republic of Korea CSIR Meraka Institute Pretoria South Africa Department of Electrical Engineering and Computer Science KAIST Daejeon Republic of Korea

SWEET routing protocol is one of the many protocols developed for cluster formation and routing in wireless sensor networks. The SWEET protocol is a decentralized clustering protocol, it uses timers and interim updated cluster head estimation probability. This paper focus on the details of the initialization waiting time, sleeping mode and base station in order to increase the life cycle of the network. The initial waiting time's resizing procedure is carried by a weighting factor which is computed from the delay slot time and delay frame time. Other improvements are the introduction of sleeping mode energy saving technique. The last contribution is through the enabled base station's ability to become a cluster head. A simulation based performance evaluation of our proposed EN-SWEET protocol shows superiority in energy efficiency.

关键词： Protocols Wireless sensor networks Base stations Delays Batteries Microsensors Magnetic heads

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