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检索条件"机构=National Key Laboratory for Parallel and Distributed Processing"

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Power-Efficient Work Distribution Method for CPU-GPU Heterogeneous System

Power-Efficient Work Distribution Method for CPU-GPU Heterog...

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International Symposium on parallel and distributed processing with Applications, ISPA

作者： Guibin Wang Xiaoguang Ren National Laboratory of Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha Hunan China

As the system scales up continuously, the problem of power consumption for high performance computing (HPC) system becomes more severe. Heterogeneous system integrating two or more kinds of processors, could be better adapted to heterogeneity in applications and provide much higher energy efficiency in theory. Many studies have shown heterogeneous system is preferable on energy consumption to homogeneous system in a multi-programmed computing environment. However, how to exploit energy efficiency (Flops/Watt) of heterogeneous system for a single application or even for a single phase in an application has not been well studied. This paper proposes a power-efficient work distribution method for single application on a CPU-GPU heterogeneous system. The proposed method could coordinate inter-processor work distribution and per-processor's frequency scaling to minimize energy consumption under a given scheduling length constraint. We conduct our experiment on a real system, which equips with a multi-core CPU and a multi-threaded GPU. Experimental results show that, with reasonably distributing work over CPU and GPU, the method achieves 14% reduction in energy consumption than static mappings for several typical benchmarks. We also demonstrate that our method could adapt to changes in scheduling length constraint and hardware configurations.

关键词： Graphics processing unit Energy consumption Power demand Processor scheduling Benchmark testing Power measurement

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Metal interference analysis and design rules of on-chip antennas for wireless interconnect

Metal interference analysis and design rules of on-chip ante...

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URSI International Symposium on Signals, Systems, and Electronics (ISSSE)

作者： Xiaowei He Minxuan Zhang Jinwen Li Shaoqing Li National Laboratory of Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha Hunan China

The influence of on-chip metal interconnections, power grids, heat sink together with packaging, and metal dummy fills on the transmission characteristics of a 2mm-long integrated dipole antenna pair has been investigated in this paper. These metal structures and placements have been classified and particular simulations are performed to explore the interference effects of neighboring various metal structures on transmission gain, phase, impedance and radiation pattern for on-chip dipole antenna pair. By virtue of the experimental results and analyses, several experiential linear expressions for antenna pair gain and phase in interference circumstances are obtained using numerical fit. A set of design rules is concluded accordingly for guiding on-chip antenna layout and design targeting wireless interconnect.

关键词： Metals System-on-a-chip Transmitting antennas Dipole antennas Silicon

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Window memory accesses method in alternate row/column matrix access systems

Window memory accesses method in alternate row/column matrix...

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International Conference on Computer Engineering and Technology, ICCET

作者： Jie Zhou Yong Dou Yuanwu Lei Yazhuo Dong National Laboratory for Parallel & Distributed Processing National University of Defense Technology Changsha China Unit 91655 Beijing China

ISBN: (纸本)9781424463473;9781424463497;9781424463503

Many systems, such as Synthetic Aperture Radar (SAR) processing, two-dimensional image processing, 2d-FFT calculation, need access the row and column data of their matrix alternately. The DRAM memory should be used due to huge data in these systems. To improve the usage of memory bandwidth in such systems, this paper theoretically analyses the optimal window size to minimize the total number of opening/closing pages when performing in such instances by balancing the number of handling physical pages between row and column accesses. This paper presents a window-based optimal memory access method, and we implemented an FPGA-based SDRAM controller with eight simple ports, which is based on window accessing mechanism and supports commercialized SDARM. The experimental results show that the effective I/O bandwidth of external SDRAM using our window layout approach increases from 114.2MB/s of naive implementation to 730.2MB/s with over 6X speedup. In addition, we implemented two SAR processing systems with four FFT processing elements using our window-based SDRAM controller and Corner Turn method separately in FPGA chip. Results show window-based method can achieve a speedup of 2.6 compared to Corner Turn method.

关键词： SDRAM Synthetic aperture radar Bandwidth Image processing Random access memory Performance analysis Optimal control Commercialization Control systems Field programmable gate arrays

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Stigmergic Collaboration: A Sign-Based Perspective of Stigmergy

Stigmergic Collaboration: A Sign-Based Perspective of Stigme...

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2010 International Conference on Intelligent Computation Technology and Automation(2010 智能计算技术与自动化国际会议 ICICTA 2010)

作者： Chuanjun Ren Hongbing Huang Shiyao Jin National Laboratory for Parallel & Distributed Processing College of Computer Science National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9781424472796

Insects build architecturally complex nests and search for remote food by collaboration work despite their limited sensors, minimal individual intelligence and the lack of a central control system. Insets' collaborations emerge as a response of the individual insects to Stigmergy. A sign-based model of Stigmergy to discuss collaboration is proposed in this paper where we picked up "sign" as a key notion to understand it. Therefore, sign is the link of all the components in a Stigmergic complex adaptive system. Based on this understanding, we propose a definition that reveals the nature of signs and exploit the significations and relationships carried by the notion of sign. Then, a sign-based model of Stigmergy is consequently reached, which captures the essentials of Stigmergy. A basic architecture of Stigmergy as well as its constituents are presented and discussed. At last, some applications of the model are discussed.

关键词： Stigmergy Sign Emergence Collaboration CAS

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Notice of Retraction: parallel block multigrid preconditioner for 3D Navier-Stokes equations on unstructured grids

Notice of Retraction: Parallel block multigrid preconditione...

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International Conference on Computer Application and System Modeling (ICCASM)

作者： Zongzhe Li Lu Yao Wei Cao Yongxian Wang Zhenghua Wang School of Computer Science Parallel and Distributed Processing for National Laboratory National University of Defense Technology Changsha Hunan China

This article has been retracted by the publisher.

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A compact model for multi-island single electron transistors

A compact model for multi-island single electron transistors

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IEEE International Nanoelectronics Conference (INEC)

作者： Yaqing Chi Haiqin Zhong Chao Zhang Liang Fang National Key Laboratory of Parallel and Distributed Processing School of Computer National University of Defense Technology Hunan China National University of Defense Technology Changsha Hunan CN

Multi-island single electron transistor (MISET) is a kind of single electron transistor (SET), which has advantages of the room temperature operating. A novel semi-empirical compact model for MISET is proposed. The new approach combines the orthodox theory of single electron tunneling for single Coulomb island and a novel empirical analysis for a chain of Coulomb islands. The model is verified by the Monte-Carlo method in SIMON simulator, and is much faster than the traditional multi-island SET simulator, which has the advantages for the large scale multi-island SET circuit simulation.

关键词： Single electron transistors Circuit simulation Tunneling Large-scale systems Voltage Temperature Character generation Electrodes distributed processing Concurrent computing

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Implementation of encrypted data for outsourced database

Implementation of encrypted data for outsourced database

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International Conference on Computational Intelligence and Natural Computing, CINC

作者： Zheng-Fei Wang Ai-Guo Tang National Key Laboratory of Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha China Department of Computer Hunan Business College Changsha China

ISBN: (纸本)9781424477050

Encryption technology has become an important mechanism of securing data stored in the outsourced database. However, it is a difficulty to query efficiently the encrypted data and many researchers take it into consideration. To solve the problem, an encrypted schema, based on the Postgresql DBMS, is proposed. Through the security dictionary and the extended SQL, the approach implements the encrypted storage and efficiently query over the encrypted data in the outsourced databases. Results of experiments validate the efficiency and feasibility of our approach.

关键词： Indexes Dictionaries Random access memory Catalogs Encryption

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nSET: Novel simulation method for single-electron tunnel device with 1-Dimension multiple islands

nSET: Novel simulation method for single-electron tunnel dev...

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IEEE International Nanoelectronics Conference (INEC)

作者： Bingcai Sui Yaqing Chi Liang Fang National Laboratory of Parallel and Distributed Processing School of Computer National University of Defense Technology Hunan China National University of Defense Technology China

ISBN: (纸本)9781424435432

Single-electronic transistors (SETs) are considered as the attractive candidates for post-CMOS VLSI due to their ultra-small size and low power consumption. Because SETs with single island can not work at room temperature normally, more and more researchers begin to make research on the SETs with 1-dimension multi-islands. A new simulation method-nSET, is introduced in this paper. Compared with other methods, nSET can simulate the SET device with 1-dimension multiple islands with high speed and accuracy. Through the comparison, it can be get that nSET is accurate and fast compared with the classical Monte Carlo (MC) simulator, and is very useful for the ASIC design of SET devices.

关键词： Tunneling Programming profession Capacitance Circuit simulation Electrostatics Single electron transistors Application specific integrated circuits Discrete event simulation Very large scale integration Energy consumption

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High performance and memory efficient implementation of matrix multiplication on FPGAs

High performance and memory efficient implementation of matr...

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IEEE International Conference on Field-Programmable Technology (FPT)

作者： Guiming Wu Yong Dou Miao Wang National Laboratory of Parallel and Distributed Processing National University of Defense Technology Changsha China Jiangnan Institute of Computing Technology Wuxi China

We present a high performance and memory efficient hardware implementation of matrix multiplication for dense matrices of any size on the FPGA devices. By applying a series of transformations and optimizations on the original serial algorithm, we can obtain an I/O and memory optimized block algorithm for matrix multiplication on FPGAs. A linear array of processing elements (PEs) is proposed to implement this block algorithm. We show significant reduction in hardware resources consuming compared to the related work while increasing clock frequency. Moreover, the memory requirement can be reduced to O(S) from O(S 2 ), where S is the block size. Therefore, more PEs can be integrated into the same FPGA devices.

关键词： Field programmable gate arrays Arrays Random access memory Algorithm design and analysis Hardware Memory management Optimization

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Towards Building Efficient Content-Based Publish/Subscribe Systems over Structured P2P Overlays

Towards Building Efficient Content-Based Publish/Subscribe S...

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International Conference on parallel processing (ICPP)

作者： Shengdong Zhang Ji Wang Rui Shen Jie Xu National Laboratory of Parallel and Distributed Processing National University of Defense Technology Changsha China School of Computing University of Leeds Leeds UK

In this paper, we introduce a generic model to deal with the event matching problem of content-based publish/subscribe systems over structured P2P overlays. In this model, we claim that there are three methods (event-oriented, subscription-oriented and hybrid) to make all the matched pairs (event, subscription) meet in a system. By theoretically analyzing the inherent problem of both event-oriented and subscription-oriented methods, we propose PEM (Popularity-based Event Matching), a variant of hybrid method. PEM can achieve better trade-off between event processing load and subscription storage load of a system. PEM has been verified through both mathematical and simulation-based evaluation.

关键词： Subscriptions Decision support systems Publishing Load modeling Mathematical model Bandwidth Routing

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