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IEEE International Conference on Image processing 2005, ICIP 2005

作者： De Freitas Zampolo, Ronaldo Seara, Rui LaPS - Signal Processing Laboratory Department of Electrical and Computer Engineering Federal University of Pará 66075-110 Belém PA Brazil LINSE - Circuits and Signal Processing Laboratory Department of Electrical Engineering Federal University of Santa Catarina 88040-900 Florianópolis SC Brazil

ISBN: (纸本)0780391349

In this paper three image quality metrics are compared: mean-square error (MSB), noise quality measure (NQM), and structural information metric (SIM). Such a comparison is made in order to evaluate the performance of those different metrics under practical conditions. Experimental results along with statistical indices of performance are provided. The referred results suggest that there are situations in which the MSB-based metric outperforms the two other considered metrics. © 2005 IEEE.

关键词： Image quality

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A distributed management scheme for partitionable parallel computers

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IEEE Transactions on parallel and Distributed Systems 1990年第1期1卷 120-126页

作者： M. Jeng H.J. Siegel Computer Science Department University of Houston Houston TX USA Parallel Processing Laboratory School of Electrical Engineering Purdue University West Lafayette IN USA

A distributed scheme for dynamic partitioning is investigated. Distributed procedures to split a subsystem and to combine subsystems are presented. The correctness of each of these two procedures is shown, and the complexity is analyzed. The procedures are applicable to parallel computers that use interconnection networks, such as hypercube, omega, multistage cube, and extra-stage cube networks.< >

关键词： Concurrent computing Distributed computing Multiprocessor interconnection networks computer networks parallel processing Application software Hypercubes Intelligent networks Resource management Large-scale systems

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Radiative cooling for passive thermal management towards sustainable carbon neutrality

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National Science Review 2023年第1期10卷 87-97页

作者： Jun Liang Jiawei Wu Jun Guo Huagen Li Xianjun Zhou Sheng Liang Cheng-Wei Qiu Guangming Tao Wuhan National Laboratory for Optoelectronics and Optics Valley Laboratory Huazhong University of Science and Technology Department of Electrical and Computer Engineering National University of Singapore MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power Engineering Xi'an Jiaotong University Key Laboratory of Education Ministry on Luminescence and Optical Information Technology National Physical Experiment Teaching Demonstration CenterDepartment of PhysicsSchool of Physical Science and Engineering Beijing Jiaotong University State Key Laboratory of Material Processing and Die &Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology

Photonic structures at the wavelength scale offer innovative energy solutions for a wide range of applications,from high-efficiency photovoltaics to passive cooling,thus reshaping the global energy *** cooling based on structural and material design presents new opportunities for sustainable carbon neutrality as a zero-energy,ecologically friendly cooling *** this review,in addition to introducing the fundamentals of the basic theory of radiative cooling technology,typical radiative cooling materials alongside their cooling effects over recent years are summarized and the current research status of radiative cooling materials is outlined and ***,technical challenges and potential advancements for radiative cooling are forecast with an outline of future application scenarios and development *** the future,radiative cooling is expected to make a significant contribution to global energy saving and emission reduction.

关键词： photonic structures radiative cooling energy saving and emission reduction carbon neutrality

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Cooperative spectrum sharing in relay-trading mode: A fairness view

Cooperative spectrum sharing in relay-trading mode: A fairne...

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4th International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC 2012

作者： Liu, Lixia Hu, Gang Xu, Ming Peng, Yuxing National Key Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha 410073 China Department of Networks Engineering School of Computer National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9780769548104

In the relay-trading mode of wireless cognitive radio networks the secondary user (SU) can achieve a promised spectrum access opportunity by relaying for the primary user (PU). How to utilize the exchanged resource efficiently and fairly is an interesting and practical problem. In this paper we proposed a cooperative spectrum sharing strategy (RT-CSS) for the relay-trading mode from the fairness view. The cooperative SUs are gathered in a cooperative sharing group (CSG), and contribution metric (CM) is proposed to measure each CSG member's contribution to CSG as well as benefit from CSG. The adjustment of CM can guarantee the fairness and efficiency of spectrum sharing. The numerical simulation shows that RT-CSS can achieve better performance than the sense-uncooperative mode. © 2012 IEEE.

关键词： Cognitive radio

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Toward full fluctuation analysis of small FETs

Toward full fluctuation analysis of small FETs

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10th International Meeting for Future of Electron Devices, Kansai, IMFEDK 2012

作者： Li, Yiming Cheng, Hui-Wen Parallel and Scientific Computing Laboratory Department of Electrical and Computer Engineering National Chiao Tung University 1001 Ta-Hsueh Road Hsinchu City Hsinchu 300 Taiwan

ISBN: (纸本)9781467308359

We, for the first time, estimate total fluctuation resulting from random dopants, interface traps and work functions using experimentally calibrated 3D statistical device simulation on 16-nm-gate high-κ/metal gate planar and bulk FinFET devices. The total full 3D simulated threshold voltage fluctuation (σVth), induced by the aforementioned random sources simultaneously, is different from their statistical total sum because the assumption of independently and identically distributed random variables is invalid owing to strong surface potential's interactions among them. Structural innovation using bulk FinFET implies significant fluctuation suppression, which is about 45.6% reduction on σVth. 3D vertical channel-based device provides good capability in fluctuation reduction, compared with process efforts on low interface trap density (e.g., Dit is below 10 11 eV-1 cm-2) and small grain size (e.g., 1x1 nm2) of metal gate on planar one. © 2012 IEEE.

关键词： Work function

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Computing with heterogeneous parallel machines: advantages and challenges

Computing with heterogeneous parallel machines: advantages a...

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International Symposium on parallel Architectures, Algorithms and Networks (ISPAN)

作者： H.J. Siegel Lee Wang V.P. Roychowdhury Min Tan Parallel Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

Discusses the advantages of computing with heterogeneous parallel machines, and examines the research challenges for automating the use of such systems. One type of heterogeneous computing system is a mixed-mode machine, where a single machine can operate in different modes of parallelism. Another is a mixed-machine system, where a suite of different kinds of parallel machines are interconnected by high-speed links. To exploit such systems, a task must be decomposed into subtasks, where each subtask is computationally homogeneous. The subtasks are then assigned to and executed with the machines (or modes) that will result in a minimal overall execution time. Typically, users must specify this decomposition and assignment. One long-term pursuit in heterogeneous computing is to do this automatically. An overview of a conceptual model of what this involves is given. As an example of the research in this area, a genetic-algorithm-based approach to the subtask assignment and scheduling problem is explored. Open problems in heterogeneous computing are described.

关键词： Concurrent computing parallel machines parallel processing Laboratories Switches Processor scheduling Supercomputers computer architecture Contracts Subcontracting

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Hardware support for the Seamless programming model

Hardware support for the Seamless programming model

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Frontiers of Massively parallel Computation

作者： S.A. Fineberg T.L. Casavant B.H. Pease Computer Science Corporation USA Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

The communication latency problem is presented with special emphasis on RISC (reduced instruction set computer) based multiprocessors. An interprocessor communication model for parallel programs based on locality is presented. This model enables the programmer to manipulate locality at the language level and to take advantage of currently available system hardware to reduce latency. A hardware node architecture for a latency-tolerant RISC-based multiprocessor, called Seamless, that supports this model, is presented. The Seamless architecture includes the addition of a hardware locality manager to each processing element, as well as an integral runtime environment and compiler.< >

关键词： Hardware Delay Yarn parallel processing Reduced instruction set computing Costs Coprocessors Communication system control parallel architectures Synchronization

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A parallel algorithm for singular value decomposition as applied to failure tolerant manipulators

A parallel algorithm for singular value decomposition as app...

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International Symposium on parallel processing

作者： T.D. Braun A.A. Maciejewski H.J. Siegel Parallel Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

The system of equations that govern kinematically redundant manipulators is commonly solved by finding the singular value decomposition (SVD) of the corresponding Jacobian matrix. This can require considerable amounts of time to compute, thus a parallel SVD algorithm minimizing execution time is sought. The approach employed here lends itself to parallelization by using Givens rotations and information from previous decompositions. The key contributions of this research include the presentation and implementation of a new variation of a parallel SVD algorithm to compute the SVD for a set of post-fault Jacobians. Results from implementation of the algorithm on a MasPar MP-1 and an IBM SP2 are provided. Specific issues considered for each implementation include how data is mapped to the processing elements, the effect that increasing the number of processing elements has on execution time, and the type of parallel architecture used.

关键词： parallel algorithms Singular value decomposition Jacobian matrices Concurrent computing Equations parallel machines Laboratories Matrix decomposition Manipulators Kinematics

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A stochastic model of a dedicated heterogeneous computing system for establishing a greedy approach to developing data relocation heuristics

A stochastic model of a dedicated heterogeneous computing sy...

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Heterogeneous Computing Workshop

作者： Min Tan H.J. Siegel Parallel Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

In a dedicated mixed-machine heterogeneous computing (HC) system, an application program may be decomposed into subtasks, then each subtask assigned to the machine where it is best suited for execution. Subtask data relocation is defined as selecting the sources for their needed data items. This study focuses on theoretical issues for data relocation using a stochastic HC model. It is assumed that multiple independent subtasks of an application program can be executed concurrently on different machines whenever possible. A stochastic model for HC is proposed, in which the computation times of subtasks and communication times for inter-machine data transfers can be random variables. The optimization problem for finding the optimal matching, scheduling, and data relocation schemes to minimize the total execution time of an application program is defined based on this stochastic HC model. The optimization criteria and search space for the above optimization problem are described. It is proven that a greedy algorithm based approach will generate the optimal data relocation scheme with respect to any fixed matching and scheduling schemes. This result indicates that a greedy algorithm based approach is the best strategy for developing data relocation heuristics in practice.

关键词： Stochastic systems Stochastic processes Processor scheduling Application software Greedy algorithms Random variables Optimal matching computer networks parallel processing Laboratories

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Mixed PCA/ICA spectral/spatial compression for hyperspectral imagery

Mixed PCA/ICA spectral/spatial compression for hyperspectral...

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Chemical and Biological Standoff Detection III

作者： Wang, Jing Chang, Chein-I. Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD 21250

Principal components analysis (PCA) has been widely used in many applications, particularly, data compression. Independent component analysis (ICA) has been also developed for blind source separation along with many other applications such as channel equalization, speech processing. Recently, it has been shown that the ICA can be also used for hyperspectral data compression. This paper investigates these two transforms in hyperspectral data compression and further evaluates their strengths and weaknesses in applications of target detection, mixed pixel classification and abundance quantification. In order to take advantage of the strengths of both transform, a new transform, called mixed PCA/ICA transform is developed in this paper. The idea of the proposed mixed PCA/ICA transform is derived from the fact that it can integrate different levels of information captured by the PCA and ICA. In doing so, it combines m principal components (PCs) resulting from the PCA and n independent components (ICs) generated by the ICA to form a new set of (m+n) mixed components used for hyperspectral data compression. The resulting transform is referred to as mixed (m,n)-PCA/ICA transform. In order to determine the total number of components, p needed to be generated for the mixed (m,m)-PCA/ICA transform, a recently developed virtual dimensionality (VD) is introduced to estimate the p where p = m + n. If m = p and n = 0, then mixed (m,n)-PCA/ICA transform is reduced to PCA transform. On the other hand, if m = 0 and n = p, then mixed (m,n)-PCA/ICA transform is reduced to ICA. Since various combinations of m and n have different impacts on the performance of the mixed PCA/ICA spectral/spatial compression in applications, experiments based on subpixel detection and mixed pixel quantification are conducted for performance evaluation.

关键词： Image compression

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