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Determination of Thermal Parameters of Nanostructures Exhibiting One-Dimensional Heat Flow Through a Thermal Transient Method

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MRS Online Proceedings Library 2009年第1期1172卷 54-59页

作者： Arriagada, Anton Yu, Edward T. Bandaru, Prabhakar R. Deparment of Electrical and Computer Engineering University of California at San Diego La Jolla USA Materials Science Program Mechanical Engineering Department University of California at San Diego La Jolla USA

We present an improved methodology for a thermal transient method enabling simultaneous measurement of thermal conductivity and specific heat of nanoscale structures with one-dimensional heat flow. The temporal response of a sample to finite duration heat pulse inputs for both short (1 ns) and long (5μs) pulses is analyzed and exploited to deduce the thermal properties. Excellent agreement has been obtained between the recovered physical parameters and computational simulations.

关键词： thermal conductivity nanoscale simulation

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Binarization Algorithm of Passport Image Based on Global Iterative Threshold and Local Analysis

Binarization Algorithm of Passport Image Based on Global Ite...

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International Conference on Information Management, Innovation Management and Industrial engineering, ICIII

作者： Zhiwen Wang Shaozi Li Songzhi Su Guoqing Xie Department of Computer & Engineering Guangxi University of Technology Liuzhou China Cognitive Science Department Xiamen University Xiamen China Faculty of Software Fujian Normal University Fuzhou China

A global binarization methods of the passport image based on global iterative threshold and local analysis is put forward in this paper after several binarization algorithms of document image are deeply studied according to the characteristics that passport image documents are obviously affected by the complex image background and the shading grid security-lines. Model of the method is simple, and easy to implement, can filter out noise availably. The character strokes can segmented from the background clearly.

关键词： Iterative algorithms Image analysis Algorithm design and analysis Iterative methods Gray-scale Lighting Inspection Background noise Interference Histograms

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Social Influence Models Based on Starbucks Networks

Social Influence Models Based on Starbucks Networks

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International Conference on Computational Aspects of Social Networks, CASON

作者： Minkyoung Kim Byoung-Tak Zhang June-Sup Lee Personalization Team SK Telecom South Korea Interdisciplinary Program in Cognitive Science Seoul National University South Korea School of Computer Science and Engineering Seoul National University Seoul South Korea Personalization Team SK Telecom Seoul South Korea

Starbucks coffee shops have been spread rapidly and widely all over the world, which implies that there may be diffusive powers among them and thus can be represented as social networks. In particular, the spreading speed of Starbuck Korea was at record levels. In this paper, we constructed social networks using the information about Starbuck Korea (ex. latitude and longitude of each Starbucks store in Korea, the opening date of them, opening orders of them, etc.) and evaluated influence scores of each store to measure the spreading power of Starbucks in Korea. Here, we proposed two network evaluation models, Dynamic Influence Model and Static Influence Model. Through these models, we can represent location based social networks and evaluate each node's diffusive power for expanding the size of networks and for spreading coverage all over the network.

关键词： Social network services Technological innovation computer networks Telecommunication computing cognitive science computer science Power engineering and energy Power measurement TV Joining processes

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He ion irradiation damage in Al/Nb multilayers

He ion irradiation damage in Al/Nb multilayers

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作者： Li, Nan Martin, M.S. Anderoglu, O. Misra, A. Shao, L. Wang, H. Zhang, X. Department of Mechanical Engineering Materials Science and Engineering Program Texas A and M University College Station TX 77843-3123 United States Department of Nuclear Engineering Texas A and M University College Station TX 77843-3133 United States Materials Physics and Application Division Los Alamos National Laboratory Los Alamos NM 87545 United States Department of Electrical and Computer Engineering Texas A and M University College Station TX 77843-3128 United States

We investigate the evolution of microstructure and mechanical properties of sputter-deposited Al/Nb multilayers with miscible fcc/bcc type interface and individual layer thickness, h, of 1-200 nm, subjected to helium ion irradiations: 100 keV He+ ions and a fluence of 6 10 16/cm2. Helium bubbles, 1-2 nm in diameter, are observed. When h is greater than 25 nm, hardnesses of irradiated multilayers barely change, whereas radiation hardening is more significant at smaller h. Transmission electron microscopy and scanning transmission electron microscopy studies reveal the formation of a thin layer of Nb3 Al intermetallic phase along the Al/Nb interface as a consequence of radiation induced intermixing. The dependence of radiation hardening on h is interpreted by using a composite model considering the formation of the hard Nb3 Al intermetallic layer. © 2009 American Institute of Physics.

关键词： High resolution transmission electron microscopy

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Achievable Capacity of a Spectrum Sharing System over Hyper Fading Channels

Achievable Capacity of a Spectrum Sharing System over Hyper ...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Sabit Ekin Ferkan Yilmaz Hasari Celebi Khalid A. Qaraqe Mohamed-Slim Alouini Erchin Serpedin Department of Electrical and Computer Engineering Texas A and M University Qatar Doha Qatar Electrical Engineering Program King Abdullah University for Science and Technology Thuwal Saudi Arabia

cognitive radio with spectrum sharing feature is a promising technique to address the spectrum under-utilization problem in dynamically changing environments. In this paper, achievable capacity gain of spectrum sharing systems over dynamic fading environments is studied. For the analysis, a theoretical fading model called hyper fading model that is suitable to the dynamic nature of cognitive radio channel is proposed. Closed-form expression of probability density function (PDF) and cumulative density function (CDF) of the signal-to-noise ratio (SNR) for secondary users in spectrum sharing systems are derived. In addition, the capacity gains achievable with spectrum sharing systems in high and low power regions are obtained. Numerical simulations are performed to study the effects of different fading figures, average powers, interference temperature, and number of secondary users on the achievable capacity.

关键词： Fading Power system modeling Rayleigh channels Temperature cognitive radio Interference constraints Random variables computer science education Educational programs Systems engineering education

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Patterning of SU-8 resist with Digital Micromirror Device (DMD) maskless lithography

Patterning of SU-8 resist with Digital Micromirror Device (D...

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Optical Microlithography XXII

作者： Wang, Tao Quaglio, Marzia Pirri, Fabrizio Cheng, Yang-Chun Busacker, David Cerrina, Franco Center for Nanotechnology University of Wisconsin-Madison Madison WI 53706 United States Materials Science Program University of Wisconsin-Madison Madison WI 53706 United States Polytechnic of Torino Physics Department Materials and Microsystems Laboratory C. so Duca degli Abruzzi 24 I-10129 Torino Italy Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI 53706 United States Department of Electrical and Computer Engineering Boston University Boston MA 02215 United States

ISBN: (纸本)9780819475275

Digital micromirror device (DMD) based maskless lithography has a number of advantages including process flexibility, no physical photomask requirement, fast turnaround time, cost effectiveness. It can be particularly useful in the development stage of microfluidic and bioMEMS applications. In this report, we describe the initial results of thick resist SU-8 patterning, soft lithography with polydimethylsiloxane (PDMS) and lift-off of Cr features using a modified DMD maskless system. Exposures of various patterns and microfluidic channels reveal that the system is well capable of printing 60 μm thick resist at a resolution as small as a single pixel (less than 13 μm) with an aspect ratio about 5:1. Both negatively and positively tapered sidewalls are achieved by projecting the UV light from front side of the SU-8 coated Si wafer and from the back side of the coated glass, respectively. The positive sidewall has an angle 88 which is ideal to serve as a mold for subsequent PDMS soft lithography. Both SU-8 and PDMS microfluidic devices for biomolecular synthesis were fabricated with this maskless system. In addition, a lift-off process was also developed with the intention to create built-in metal features such as electrodes and heaters. © 2009 SPIE.

关键词： Microfluidics

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Dynamic screen division for load balancing the raycasting of irregular data

Dynamic screen division for load balancing the raycasting of...

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IEEE International Conference on Cluster Computing

作者： Bernardo B. Labronici Cristiana Bentest Lucia Maria A. Drummond Ricardo Farias Computer Science Department Federal Fluminense University Niterói RJ Brazil Department of System Engineering State University of Rio de Janeiro Rio de Janeiro RJ Brazil System Engineering and Computer Science Program-COPPE Centro de Tecnologia Rio de Janeiro RJ Brazil

Parallel rendering algorithms usually suffer from high load imbalance during execution, due to the irregular nature of the datasets. In this paper, we propose a new load balancing scheme for tile-based parallel rendering that includes strategies for load estimation, tile decomposition and tile assignment. The load estimation strategy computes the rendering cost for each pixel, and uses it as a prediction for the next frame. The tile decomposition strategy adaptively divides the screen into tiles based on the computed costs, until an evenly tile partition is achieved. The tile assignment strategy distributes the tiles among rendering processors, based on a 2-optimal scheduling. Experimental results show that our scheme achieves significant performance gains by reducing the load imbalance when compared to the traditional tile subdivision and static random distribution schemes.

关键词： Load management Tiles Rendering (computer graphics) Concurrent computing Parallel processing computer science Costs Data visualization Data engineering Systems engineering and theory

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Center for resources in general education (CIVIS): Towards student success in general and STEM education

Center for resources in general education (CIVIS): Towards s...

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39th Annual Frontiers in Education Conference: Imagining and engineering Future CSET Education, FIE 2009

作者： O'Neill-Carrillo, Efraín Collins, Dana L. Garriga, Juan López MacChiavelli, Raúl Cruz, José A. University of Puerto Rico-Mayagüez Puerto Rico Electrical and Computer Engineering Department Puerto Rico CIVIS: Center for Resources in General Education UPRM United States Department of Humanities United States Department of Chemistry Puerto Rico Science on Wheels Program UPRM Puerto Rico College of Agricultural UPRM Puerto Rico College of Business Administration UPRM Puerto Rico

ISBN: (纸本)9781424447152

Researchers at the University of Puerto Rico-Mayaguez (UPRM) have conducted an analysis of student needs and have identified strategies to respond to the General and STEM education challenges at UPRM. A Center for Resources in General Education (CIVIS) has been established to deal with these challenges by providing students and professors a new, integrated perspective (focused on General and STEM skills) of the curriculum, and by enabling student academic success through various learning opportunities. CIVIS brings together faculty from Agricultural sciences, Arts and sciences, Business Administration and engineering in order to develop activities that provide interdisciplinary and global perspectives to UPRM's General Education. The Center focuses on two main activities: 1) Paths to Student Success, and 2) Sustainable Context with the use of student learning modules tying the activities together. AU initiatives of the Center are supported by a recent grant from the U.S. department of Education, and are based on the success of initiatives that have been previously tested at a smaller scale at UPRM. CIVIS provides resources to expand the reach of those initiatives and will ensure sustainability by the institutionalization of those initiatives. ©2009 IEEE.

关键词： Students

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Intelligent-adaptive flight control with a physiologically motivated algorithm

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International Journal of Modelling and Simulation 2009年第1期29卷 12-18页

作者： Mehrabian, A.R. Lucas, C. School of Mechanical Engineering Department of Engineering University of Tehran P.O. Box: 14875 - 347 Tehran Iran Center of Excellence for Control and Intelligent Processing School of Electrical and Computer Engineering Department of Engineering P.O. Box: 14395 - 515 Tehran Iran School of Cognitive Science IPM Tehran Iran

This paper presents a now intelligent approach for adaptive control of non-linear dynamic systems. Based on past researches on emotionally intelligent-control systems, the introduced method is a modified version of Brain Emotional Learning Based Intelligent Controller (BELBIC), a physiologically motivated system previously developed and successfully used in control applications. The proposed approach is able to quickly respond to change in environmental and dynamic system and realizes online diroct-adaptivc-control scheme. Showing very good robustness, BELBIC is very simple in implementation and imposes very low computation load on the control system. This modified algorithm has boon successfully applied to real-time longitudinal control of an agile air-to-air missile which has over-changing non-linear dynamics.

关键词： Intelligent systems

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Dynamics of SU(1,1) coherent states for the damped harmonic oscillator

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Physical Review A 2009年第5期79卷 054103-054103页

作者： Jeong Ryeol Choi Kyu Hwang Yeon School of Electrical Engineering and Computer Science Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702–701 Republic of Korea Department of Physics and BK21 Physics Program College of Natural Science Chungbuk National University Cheongju Chungbuk 361-763 Republic of Korea

Gerry, Ma, and Vrscay [Phys. Rev. A 39, 668 (1989)] studied the time evolution of SU(1,1) coherent states for the damped harmonic oscillator by introducing the Kanai-Caldirola Hamiltonian. The purposes of this Brief Report are to demonstrate that there are somewhat serious errors on their results and to correct them. Most of the figures given in their work are reproduced with correction in order to facilitate our explanation of results.

关键词： correction explanation results damped harmonic oscillator ANNIHILATION OPERATORS dynamics

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