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International Solid-State Sensors, Actuators and Microsystems Conference

作者： Zeng, X. Huang, C.-C. Jiang, H. Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI United States Eye Research Institute University of Wisconsin - Madison Madison WI United States Materials Science Program University of Wisconsin - Madison Madison WI United States

ISBN: (纸本)9781457701573

A method to fabricate complex structures on non-planar surfaces by utilizing a transfer method is presented. 3-dimensional and high-aspect-ratio microelectromechanical systems (MEMS) structures are transferred to flexible membranes, and can be further transferred to any non-planar surfaces. Here, we used a structure formed on a silicon-on-insulator (SOI) wafer by deep reactive-ion etching (DRIE) as an example. Both photoresist SU8-2050 and AZ 4620 were used as the flexible membranes. The effect of the structure and density of pillars on the transferring procedure was studied. Potentially this method could be utilized to transfer any MEMS structures and devices to any non-planar surfaces, thus possessing great potential in MEMS devices. © 2011 IEEE.

关键词： Photoresists

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High Performance High Dielectric Constant Films Deposited by Dual Spectral Source Rapid Isothermal Assisted Metalorganic Chemical Vapor Deposition (MOCVD)

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MRS Online Proceedings Library (OPL) 2011年第1期470卷 133-133页

作者： Y. Chen R. Singh S. DeBoer R.P.S. Thakur Department of Electrical and Computer Engineering Clemson University Clemson SC 29634 Department of Electrical and Computer Engineering and Material Science and Engineering Program Clemson University Clemson SC 29634 singh@ces.clemson.edu Micron Technology Inc. Boise ID 83706

Dual spectral source assisted MOCVD is an ideal technique for the deposition of high dielectric constant materials as well as other electronic and optical materials. Tungsten halogen lamps and a deuterium lamp are used as the sources of optical and thermal energy. Ta2O5 films were deposited at 200°C for 30 minutes and annealed at 600°C for 30 minutes have shown leakage current densities as low as 10−10 A/ cm2 for gate voltage under 5V. To the best of our knowledge, these are the best results reported to date by other researchers. The high energy photons used in the in-situ cleaning and deposition process play an important role in obtaining high quality films of Ta2O5.

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On the maximum imbalance of binary sequences with low aperiodic autocorrelations

On the maximum imbalance of binary sequences with low aperio...

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5th International Workshop on Signal Design and Its Applications in Communications, IWSDA'11

作者： Trinh, Quang Khai Fan, Pingzhi Hao, Li Mow, Wai Ho Telecommunication Department Faculty of Electrical and Electronic Engineering University of Transport and Communications Lang Thuong Dong Da Hanoi Viet Nam Provincial Key Lab of Information Coding and Transmission Institute of Mobile Communications Southwest Jiaotong University Chengdu Sichuan 610031 China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong

ISBN: (纸本)9781612840468

Binary sequences with low aperiodic autocorrelation function sidelobes, such as Barker, quasi-Barker, and minimum peak sidelobe sequences have found extensive applications in radar and communications systems. However, there is no systematic method to construct such desirable binary sequences except the use of time consuming and costly exhaustive computer search. In this paper, an upper bound on the maximum imbalance of binary sequences with low aperiodic autocorrelation is derived and is expressed in terms of the sequence length, the window size and the peak sidelobe levels. It sheds some light on the tradeoff between the sequence parameters involved and may be useful in developing efficient sequence searches. © 2011 IEEE.

关键词： Binary sequences

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Capacitance Humidity Sensor

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MRS Online Proceedings Library 2011年第1期382卷 469-475页

作者： Andrew R. K. Ralston Paul E. Thoma Carl F. Klein Denice D. Denton Materials Science Program Department of Electrical and Computer Engineering and Department of Chemistry University of Wisconsin-Madison Madison USA Central Research Johnson Controls Inc. Milwaukee USA

A capacitance relative humidity (RH) sensor is described that has a design, construction, and material composition that result in an inexpensive and robust sensor. This sensor has a multilayer, free-standing film construction. It consists of a humidity sensitive polyimide (PI) dielectric core and conductive layers consisting of carbon filled polysulfone on each side of the polyirnide film to form a capacitor. The polyimide used is a BPDA-ODA type, and replaces a PMDA-ODA type polyimide used in a previous version of this sensor. The BPDA-ODA sensor has a nominal capacitance of 200 pF and a nominal sensitivity of 13% at 100% RH. The characteristics of this humidity sensor are discussed and compared to the characteristics of the PMDA-ODA type sensor. Characteristics considered include the PI film moisture uptake and water vapor transmission, and the sensors’ sensitivity to relative humidity, frequency response, and aging at 85°C/85% RH. The dual-state sorption model and free volume calculations are used to demonstrate that observed differences in the film are due to differences in chemical composition between the films.

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Formation of a paper neural-fuzzy time scale in the eastern Asia

Formation of a paper neural-fuzzy time scale in the eastern ...

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IEEE International Frequency Control Symposium

作者： Chia-Shu Liao Fand-Dar Chu Huang-Tien Lin Yi-Jiun Huang Kun-Yuan Tu Yen-Wen Chung Wei-Chih Hsu National Time and Frequency Standard Laboratory Telecommunication Laboratories Chunghwa Telecom Company Limited Taoyuan Taiwan Department of Computer Science and Information Engineering Vanung University Taoyuan Taiwan Department of Computer and Communication Engineering National Kaohsiung First University of Science and Technology Kaohsiung Taiwan

This work presents a novel scheme to simulate a paper time scale by utilizing ensemble clock data of time laboratories in the eastern Asia-Pacific region. Based on integration of the above data with a neural-fuzzy prediction approach, the time difference with a local coordinated universal time is analyzed by a reference time scale devised in this work. Validity of the proposed scheme is investigated by undertaking a 250-day long neural-fuzzy predictor that is based on the calculated clock ensembles from Asian time laboratories. In the Asia-Pacific rim region, TWSTFT links from four laboratories, including the National Institute of Information and Communications Technology of Japan (NICT), the National Time Service Center of China (NTSC), the Korea Research Institute of Standards and science of Korea (KRISS), and the telecommunication Laboratories of Taiwan (TL), have formed a time transfer network based on use of multi-channel TWSTFT time transfer modems. Thus, a paper neural-fuzzy reference time scale by using the ensemble clock data among NICT, NTSC, KRISS, and TL in the Asia-Pacific region is simulated. Moreover, the performance of the proposed time scale is evaluated.

关键词： Laboratories Clocks Time frequency analysis computer architecture Communications technology Firing Stability analysis

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Performance of Multihop Relay Systems in a Rayleigh Fading Environment with Co-Channel Interference

Performance of Multihop Relay Systems in a Rayleigh Fading E...

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2011 IEEE Global telecommunications Conference - GLOBECOM 2011

作者： Termpong Soithong Valentine A. Aalo George P. Efthymoglou Chirasil Chayawan Electronics and Telecommunication Engineering School of Engineering King Mongkut's University of Technology Bangkok Thailand Department of Computer and Electrical Engineering and Computer Science Florida Atlantic University Boca Raton FL USA Department of Digital Systems University of Piraeus Piraeus Greece

In this paper we investigate the effect of co-channel interference on the performance of multihop transmission systems that employ amplify-and-forward (AF) relays and operate in a Rayleigh fading environment. Using an upper bound for the end-to-end signal-to-interference-and-noise ratio (SINR) which is given by the minimum SINR of all the hops, we derive closed form expressions for the outage probability and the moment generating function (MGF) of the SINR bound. The average symbol error rate of various modulation formats in multihop AF relay systems can then be obtained using the MGF-based approach, whereas closed-form expressions are obtained for the case of binary phase shift keying. The analysis considers relay systems that suffer from the presence of noise and interference as well as interference-limited and noise-limited systems. The accuracy of the analytical results is verified by computer simulation.

关键词： Signal to noise ratio Relays Interference Binary phase shift keying Bit error rate Fading

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Handling failures of static sensor nodes in wireless sensor network by use of mobile sensors

Handling failures of static sensor nodes in wireless sensor ...

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25th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2011

作者： Pignaton De Freitas, Edison Heimfarth, Tales Netto, Ivayr Farah Pereira, Carlos Eduardo Ferreira, Armando Morado Wagner, Flávio Rech Larsson, Tony IDE Halmstad University Halmstad Sweden Institute of Informatics Federal University of Rio Grande Do Sul Porto Alegre Brazil Computer Science Department Federal University of Lavras Lavras Brazil Electrical Engineering Department Federal University of Rio Grande Do Sul Porto Alegre Brazil Defense Engineering Graduate Program Military Institute of Engineering Rio de Janeiro Brazil

ISBN: (纸本)9780769543383

Node failures in Wireless Sensor Networks composed by static sensor nodes are common due to the nature of the sensor devices and the usually harsh environments in which they are deployed. Node failures can diminish the performance of the network as a whole, thus affecting its functionality in delivering the desired services. For instance, significant regions can become uncovered due to failure of several nearby nodes. This paper reports a study about the use of mobile sensor nodes acting in cooperation with static ones in order to fill gaps created by faulty static nodes. The proposed fault handling mechanism presents alternative policies with pros and cons, depending on the user priorities imposed to the system and the occurrence of failures. A discussion about this topic is presented based on results obtained by simulation of the proposed mechanisms. © 2011 IEEE.

关键词： Sensor nodes

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QUANTITATIVE ANALYSIS OF MRI-MEASURED WATER MOBILITY INCREASES IN RESPONSE TO CHEMOTHERAPY VIA MULTIPLE CELL-DEATH MECHANISMS

QUANTITATIVE ANALYSIS OF MRI-MEASURED WATER MOBILITY INCREAS...

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第十三届国际体视学大会

作者： Will G Xia David Morse Robert J Gillies Bioengineering Program Department of Electrical Engineering and Computer Science University of Arizona Cancer Center Tueson AZ 85724USA

Numerous pre-clinical and clinical reports have demonstrated that the MRI-measured apparent diffusion coefficient of water(ADC) increases early in the response to a wide variety of anti-cancer *** has been proposed that this increase in ADC generally results from an increase in the tumor extracellular volume fraction leading to a greater degree of unrestricted water ***,an increase in extracellular volume has been ascribed to the cell shrinkage that occurs early in the process of programmed cell ***,other modes of death can be initiated soon after beginning *** other modes of death include mitotic catastrophe and necrosis,and may also involve changes in the fraction of water with unrestricted *** work quantitatively examines whether MRI-measured ADC is altered in response to therapies that induce cell death via non-apoptotic mechanisms and correlates ADC changes with cell death modalities regionally within the *** morphometric analysis show apoptotic responses were limited to the tumor periphery in apoptosis-proficient *** was not observed in deficient *** catastrophe was observed after treatment at the periphery and deeper into the *** was the predominant response in the center of the *** changes were moderate in the periphery and larger in the *** results indicate that early and significant changes in ADC can occur in concert with mitotic catastrophe and lytic necrosis in the absence of ***,changes in ADC may be a generalized measure of cytotoxic response to chemotherapy.

关键词： diffusion MRI imaging morphometry cell death

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Design and implementation of a hybrid SET-CMOS based hi-speed and power efficient pulse divider circuit

Design and implementation of a hybrid SET-CMOS based hi-spee...

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International Conference on Sustainable Energy and Intelligent Systems (SEISCON 2011)

作者： Anindya Jana N Basanta Singh Anup Sarkar J.K. Sing Subir Kumar Sarkar Department of Electronics & Telecommunication Engineering Jadavpur University Kolkata India Department of Electronics & Communication Engineering Manipur Institute of Technology Imphal India Womens Polytechnic Kolkata India Department of Computer Science and Engineering Jadavpur University Kolkata India

Hybrid SET-CMOS circuits which combine the merits of both the SET and CMOS promises to be a practical implementation for future low power ultra-dense VLSI/VLSI circuit design. In this work, an SET-CMOS hybrid pulse divider circuit is proposed. The MIB model for SET and BSIM4 model for CMOS are used. The operation of the proposed circuit is verified in Tanner environment. The performances of CMOS and Hybrid SET-CMOS based pulse divider circuits are compared. The hybrid SET-CMOS circuit is found to consume lesser power than the CMOS based circuit. Further it is established that hybrid SET-CMOS based circuit is much faster compared to CMOS based circuit.

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Microfluidic actuators based on infrared-light responsive PNIPAAm hydrogel nanocomposite incorporating graphene-oxide

Microfluidic actuators based on infrared-light responsive PN...

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International Solid-State Sensors, Actuators and Microsystems Conference

作者： Lo, Chi-Wei Zhu, Difeng Jiang, Hongrui Materials Science Program University of Wisconsin-Madison WI 53706 United States Department of Electrical and Computer Engineering University of Wisconsin-Madison WI 53706 United States Eye Research Institute University of Wisconsin Madison Madison WI 53706 United States

ISBN: (纸本)9781457701573

In lab-on-a-chip systems, microactuators are critical to control the flow within the microchannels. Most of the current actuators require hardware connection (electromagnetic, thermopneumatic actuators, etc.) within the channels, thus significantly increasing the system complexity. Remotely controllable actuators would greatly simplify the system. We demonstrate nanocomposite microfluidic actuators remotely controlled by infrared (IR) light. These actuators are fabricated out of thermo-responsive poly-N- isopropylacrylamide (PNIPAAm) nanocomposite hydrogels incorporated with glycidyl methacylate functionalized graphene-oxide (GO-GMA). Two example devices were realized implementing such actuators: a microvalve and a tunable liquid microlens. © 2011 IEEE.

关键词： Hydrogels

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