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2012 Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head 2012

作者： Gerasopoulos, K. Pomerantseva, E. Brown, A. Wang, C. Culver, J. McCarthy, M. Ghodssi, R. MEMS Sensors and Actuators Laboratory Institute for Systems Research University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States Department of Materials Science and Engineering University of Maryland College ParkMD20742 United States Department of Plant Sciences and Landscape Architecture University of Maryland College ParkMD20742 United States Department of Chemical and Biomolecular Engineering University of Maryland College ParkMD20742 United States Department of Mechanical Engineering and Mechanics Drexel University PhiladelphiaPA19104 United States

ISBN: (纸本)9780964002494

We present a novel approach for the fabrication of hierarchical electrodes that integrates bottom-up nanostructure self-assembly and top-down microfabrication processes. The electrodes consist of virus-templated nanostructures self-assembled on three-dimensional micropillars. Active battery material (V2O5) is conformally deposited using atomic layer deposition (ALD) on the hierarchical micro/nano network. Electrochemical testing of these electrodes indicates a 3-fold increase in energy density compared to nanostructures alone, while maintaining the high power characteristics. Investigation of capacity scaling for varying active material thickness reveals underlying limitations and highlights the importance of our method in controlling both energy and power density with structural hierarchy. © 2012 TRF.

关键词： Actuators

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Using Mobile Sinks in WSN: Computational Complexity and a Theoretical Bound

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电子学报(英文版) 2011年第1期20卷 147-150页

作者： GU Yu JI Yusheng CHEN Hongyang ZHAO Baohua Department of Computer Science University of Science and Technology of China Hefei China State Key Laboratory of Networking and Switching Technology Beijing China Information Systems Architecture Science Research Division NII Tokyo Japan Institute of Industrial Science University of Tokyo Tokyo Japan

In this paper, we study the lifetime op- timization problem in wireless sensor networks using mo- bile sink nodes. This problem is inherently difficult since we need to consider both sink scheduling and data rout- ing. Through a simple case study we develop a novel no- tation named the Placement pattern (PP) to bound traffic patterns with candidate locations. This significantly de- creases the number of elements needed to be scheduled. Based on the PP, we mathematically formulate this opti- mization problem as a Mixed-integer non-linear program- ming (MINLP), which is very tough and time consuming to solve. By proving that the problem is NP-complete, we point out that instead of seeking an optimal algorithm, heuristic algorithms, especially those with performance guarantee, would be much more desirable to develop. Fur- thermore, in order to help identify performance gains of heuristic algorithms proposed in the future, we develop a Linear programming (LP) formulation which serves as an upper bound by adopting a reformulation and relaxation technique.

关键词：无线传感器网络移动接收计算复杂性混合整数非线性规划启发式算法 NP完全问题优化问题 MINLP

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Explaining how intelligent control has improved the way we live: A survey on the use of Fuzzy Logic Controllers in daily human life

Explaining how intelligent control has improved the way we l...

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International Conference on Multimedia Computing and systems

作者： Lasri, R. Rojas, I. Pomares, H. Sadouq, Z. Dept. of Computer Architecture and Computer Technology E.T.S. Ing. Informática and Telecomunicación Univ. of Granada Spain Information and Telecommunication Systems Laboratory Abdelmalek Essaadi University Faculty of Science Tetuan Morocco

ISBN: (纸本)9781612847306

This paper focuses on the extensive use of Fuzzy Logic Controllers (FLCS) in various human applications, showing the great contribution added to intelligent control. Overall, this survey covers a broad selection of examples that demonstrates the improvements in control processes and the important role played by Fuzzy Logic Controllers (FLCS) in various fields of human life. © 2011 IEEE.

关键词： Intelligent control

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A parallel Ray Tracing architecture suitable for application-specific hardware and GPGPU implementations

A parallel Ray Tracing architecture suitable for application...

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2011 14th Euromicro Conference on Digital System Design: architectures, Methods and Tools, DSD 2011

作者： Nery, Alexandre S. Nedjah, Nadia Franca, Felipe M.G. Jozwiak, Lech LAM - Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering Universidade do Estado Rio de Janeiro Brazil Department of Electrical Engineering - Electronic Systems Eindhoven University of Technology Netherlands

ISBN: (纸本)9780769544946

The Ray Tracing rendering algorithm can produce high-fidelity images of 3-D scenes, including shadow effects, as well as reflections and transparencies. This is currently done at a processing speed of at most 30 frames per second. Therefore, actual implementations of the algorithm are not yet suitable for interactive real-time rendering, which is required in games and virtual reality based applications. Fortunately, the algorithm allows for massive parallelization of its computations. In this paper, we present a parallel architecture for ray tracing based on a uniform spatial subdivision of the scene and exploiting an embedded computation of ray-triangle intersections. This approach allows for a significant acceleration of intersection computations, as well as, a reduction of the total number of the required intersections checks. Furthermore, it allows for these checks to be performed in parallel and in advance for each ray. In this paper we discuss and analyze an ASIP-based implementation using FPGAs and a GPGPU-based parallel implementation of the proposed architecture. The performance of both implementations are reported and compared." © 2011 IEEE.

关键词： Ray tracing

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Hardware reuse in modern application-specific processors and accelerators

Hardware reuse in modern application-specific processors and...

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2011 14th Euromicro Conference on Digital System Design: architectures, Methods and Tools, DSD 2011

作者： Nery, Alexandre S. Jozwiak, Lech Lindwer, Menno Cocco, Mauro Nedjah, Nadia França, Felipe M.G. LAM - Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering Universidade do Estado do Rio de Janeiro Brazil Department of Electrical Engineering - Electronic Systems Eindhoven University of Technology Netherlands Silicon Hive - Intel UMG Netherlands

ISBN: (纸本)9780769544946

Effective exploitation of the application-specific parallel patterns and computation operations through their direct implementation in hardware is the base for construction of high-quality application-specific (re-) configurable application specific instruction set processors (ASIPs) and hardware accelerators for modern highly-demanding applications. Although it receives a lot of attention from the researchers and practitioners, a very important problem of hardware reuse in ASIP and accelerator synthesis is clearly underestimated and does not get enough attention in the published research. This paper is an effect of an industry and academic collaborative research. It analyses the problem of hardware sharing, shows its high practical relevance, as well as a big influence of hardware sharing on the major circuit and system parameters, and its importance for the multi-objective optimization and tradeoff exploitation. It also demonstrates that the state-of-the-art synthesis tools do not sufficiently address this problem and gives several guidelines related to enhancement of the hardware reuse. © 2011 IEEE.

关键词： Multiobjective optimization

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Theoretical treatment of sink scheduling problem in wireless sensor networks

Theoretical treatment of sink scheduling problem in wireless...

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2011 IEEE Conference on computer Communications Workshops, INFOCOM WKSHPS 2011

作者： Gu, Yu Ji, Yusheng Li, Jie Zhao, Baohua Information Systems Architecture Science Research Division National Institute of Informatics Tokyo Japan State Key Laboratory of Networking and Switching Technology Beijing 100876 China School of Computer Science Univ. of Science and Technology of China Hefei Anhui 230027 China Department of Computer Science University of Tsukuba Ibaraki 305-8573 Japan

ISBN: (纸本)9781457702488

Sink Scheduling, in the form of scheduling multiple sinks among sink sites to leverage traffic burden, is an effective mechanism for the energy-efficiency of wireless sensor networks (WSNs). Due to the inherent difficulty (NP-hard in general), existing works on this topic mainly focus on heuristic/greedy algorithms and theoretic results remain unknown. In this paper, we fill in the research blank with two algorithms. The first one is based on the Column Generation (CG). It decomposes the original problem into two sub problems and solve them iteratively to approach the optimal solution. However, due to its high computational complexity, this algorithm is only suitable for small scale networks. The other one is a polynomial-time algorithm based on relaxation techniques to obtain an upperbound, which can serve as a performance benchmark for other algorithms on this problem. Through comprehensive simulations, we evaluate the efficiency of proposed algorithms. © 2011 IEEE.

关键词： Wireless sensor networks

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Diffuse axonal injury lesion segmentation using contouring algorithm

Diffuse axonal injury lesion segmentation using contouring a...

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21st International Conference on computer Graphics and Vision, GraphiCon'2011

作者： Senyukova, Olga V. Galanine, Valeriy E. Krylov, Andrey S. Petraikin, Alexey V. Akhadov, Tolibdjon A. Sidorin, Sergey V. Department of Computer Systems Architecture Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University Moscow Russia Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University Moscow Russia Laboratory of Mathematical Methods of Image Processing CMC MSU Russia Moscow Russia

Diffuse axonal injury (DAI) is a common type of brain damage induced by trauma. Accurate detection and quantification of DAI lesions is essential for assessment of a patient's state and making a prognosis of a traumatic disease. This study is devoted to semiautomated segmentation of DAI lesions on T2*-weighted brain magnetic resonance (MR) images. A radiologist outlines the regions containing lesions, and the lesions are further automatically delineated inside these regions. A proposed algorithm for automated segmentation of DAI lesions inside specified regions is based on contouring algorithm which treats the image as a 3D topological map where a pixel's intensity corresponds to its height. It builds isolines of an intensity function. Lesion contours are among these isolines. In order to distinguish true lesion contours from other closed contours obtained by contouring algorithm machine learning approach is exploited. A labeled training base with positive (lesions) and negative (non-lesions or lesion parts) examples of closed contours is used to train the classifier. The algorithm was evaluated with real T2*-weighted brain MRI images.

关键词： Magnetic resonance

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Explaining how intelligent control has improved the way we live: A survey on the use of Fuzzy Logic Controllers in daily human life

Explaining how intelligent control has improved the way we l...

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IEEE International Conference on Multimedia Computing and systems (ICMCS)

作者： R. Lasri I. Rojas H. Pomares Z. Sadouq Department of Computer Architecture and Computer Technology E.T.S.Ing. Informática & Telecomunicación University of Granada Spain Information and Telecommunication Systems Laboratory LASIT Faculty of Science Abdelmalek Essaadi University Tetuan Morocco

关键词： Fuzzy logic Humans Control systems Intelligent control Process control Heart Anesthesia

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A Parallel Ray Tracing architecture Suitable for Application-Specific Hardware and GPGPU Implementations

A Parallel Ray Tracing Architecture Suitable for Application...

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Euromicro Symposium on Digital System Design

作者： Alexandre S. Nery Nadia Nedjah Felipa M.G. Franca Lech Jozwiak LAM-Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electrical Engineering-Electronic Systems Eindhoven University of Technology Netherlands Universidade do Estado do Rio de Janeiro Rio de Janeiro RJ BR

关键词： Ray tracing Graphics processing unit Instruction sets computer architecture Registers Image color analysis Hardware

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A parallel architecture for ray-tracing with an embedded intersection algorithm

A parallel architecture for ray-tracing with an embedded int...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Alexandre S. Nery Nadia Nedjah Felipe M.G. França Lech Jozwiak LAM-Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electrical Engineering-Electronic Systems Eindhovan University of Technology Netherlands Department of Electronics Engineering and Telecommunications-Faculty of Engineering Universidade do Estado do Rio de Janeiro (UERJ) Brazil

Real time rendering of three-dimensional scenes in Ray Tracing is a hard problem. However, parallel implementations have been enabling real time performance, as the algorithm can be highly parallelized. Thus, a custom parallel design in hardware is likely to achieve a good performance. In this paper, we further improve the GridRT architecture overall performance by embedding the ray-triangle intersection computation into the precessing elements that form the architecture. Low cost and high rendering performance are the main concerns in this novel design. The results show that the execution time of each intersection computation is reduced by at least 50%, while the area cost is practically unchanged or even reduced when compared to the original GridRT implementation.

关键词： Ray tracing Registers Equations USA Councils Mathematical model Parallel architectures

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