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2015 IEEE International Conference on computer and Communications(ICCC 2015)

作者： Chenxu Wang Yutong Lu Baida Zhang Tao Gao Peng Cheng Department of Computer Science and Technology National University of Defense Technology National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology Department of Computer Science and Technology National University of Defense Technology

Graph traversal is a widely used algorithm in a variety of fields, including social networks, business analytics, and high-performance computing and so on. Graph traversal on single nodes has been well studied and optimized on modern CPU architectures. Now, heterogeneous computing is becoming more and more popular and CPU+MIC is a typical heterogeneous architectures. The Intel MIC(Many Integrated Core) has up to 57 cores and hasn't been fully evaluated for graph traversal. When use a MIC to traverse a graph, the MIC may suffer from loading imbalance for the reason that the degree of vertexes in a graph may differs very much, which can degrade system performance. So in this paper, an algorithmic design and optimization techniques are presented to load balancing in MIC. About the optimization design, the main idea is that treat the vertexes with big degree and the vertexes with small degree separately. For this reason, some adjustments will be made to existing algorithms and data structures. It has achieved almost big performance improvements over the BFS algorithm without loading balancing in MIC as shown in section VI. We believe that this novel algorithm can be successfully applied to a broader class of graph algorithms with many MIC cores.

关键词： Graph traversal MIC BFS heterogeneous computing load balancing

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Electronic and optical properties of novel carbon allotropes

Electronic and optical properties of novel carbon allotropes

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Optics and Photonics for Energy and the Environment, E2 2015

作者： Wanga, Zhanyu Wang, S.Y. Zhang, R.J. Zheng, Y.X. Chen, L.Y. Wang, C.Z. Ho, K.M. Su, W.S. Shanghai Ultra-Precision Optical Manufacturing Engineering Center Department of Optical Science and Engineering Fudan University Shanghai200433 China Shanghai200433 China Ames Laboratory U. S. Department of Energy Department of Physics and Astronomy Iowa State University AmesIA50011 United States National Center for High-Performance Computing Hsinchu30076 Taiwan Department of Physics National Chung Hsing University Taichung40227 Taiwan

The phonon properties, electronic structures and optical properties of some novel carbon allotropes including monolayer penta-graphene (PG), double-layer PG and T12-carbon were investigated using the first-principles ... 详细信息

ISBN: (纸本)9781557528209

关键词： Graphene

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SmartBackup: An Efficient and Reliable Backup Strategy for Solid State Drives with Backup Capacitors

SmartBackup: An Efficient and Reliable Backup Strategy for S...

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IEEE International Conference on high performance computing and Communications (HPCC)

作者： Min Huang Yi Wang Liyan Qiao Duo Liu Zili Shao School of Electrical Engineering and Automation Harbin Institute of Technology Guangdong Province Key Laboratory of Popular High Performance Computers Shenzhen University College of Computer Science Chongqing University Department of Computing The Hong Kong Polytechnic University

ISBN: (纸本)9781479989386

Unpredictable power outages in NAND flashbased Solid State Drives (SSDs) may cause system failure or reliability problems. Capacitors are widely adopted as the interim power supplier when power interruption happens. However, since the energy provided by backup capacitors is limited, and the capacitance of a capacitor will gradually degrade with time, it is imperative to improve the efficiency and reliability of the backup process for SSDs with capacitors. This paper presents a novel backup scheme called SmartBackupfor MLC NAND flash-based SSDs with backup capacitors. In SmartBackup, by exploiting the feature of the discharge process of capacitors, all available SSD channels are fully utilized and dynamically adjusted based on the available voltage, so data can be efficiently stored in a reliable manner. Moreover, in SmartBackup, to write data in a time/energyefficient manner with better reliability, we adopt a fast and reliable programming strategy by only writing LSB (Least Significant Bit) pages in MLC NAND flash. To the best of our acknowledge, this is the first work to jointly utilize the property of the multi-page architecture of MLC NAND flash and the discharge characteristic of capacitors to improvethe efficiency and reliability of the backup process in SSDswith backup capacitors. The experimental results show thatSmartBackup can effectively accelerate the backup processand improve the reliability.

关键词： Capacitors Ash Reliability Programming Arrays Acceleration Discharges (electric)

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NTW-MT: A Multi-threaded simulator for reaction diffusion simulations in NEURON 15

NTW-MT: A Multi-threaded simulator for reaction diffusion si...

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3rd ACM Conference on SIGSIM-Principles of Advanced Discrete Simulation, SIGSIM-PADS 2015

作者： Lin, Zhongwei Tropper, Carl Nazrul, Mohammand Patoary, Ishlam McDougal, Robert A. Lytton, William W. Hines, Michael L. State Key Laboratory of High Performance Computing National University of Defense Technology Changsha Hunan China School of Computer Science McGill University MontrealQC Canada Department of Neurobiology Yale University 333 Cedar St. New HavenCT United States SUNY Downstate Medical Center BrooklynNY United States Department of Neurobiology Yale University New HavenCT United States

ISBN: (纸本)9781450335836

This paper describes a parallel discrete event simulator, Neuron Time Warp-Multi Thread (NTW-MT), developed for the simulation of reaction diffusion models of neurons. The simulator was developed as part of the NEURON project and is intended to be included in NEURON. It relies upon a stochastic discrete event model developed for chemical reactions. NTW-MT is optimistic and thread-based, in which communication latency among threads within the same process is minimized by pointers. We investigate the performance of NTW-MT on a reaction-diffusion model for the transmission of calcium waves in a neuron. Calcium plays a fundamental role in the second messenger system of a neuron. However, the mechanism by which calcium waves are transmitted is not entirely understood. Stochastic models are more realistic than deterministic models for small populations of ions such as those found in apical dendrites. To be more precise, we simulate a stochastic discrete event model for calcium wave propagation on an unbranched apical dendrite of a hippocampal pyramidal neuron. We examine the performance of NTW-MT on this calcium wave model and compare it to the performance of (1) a process based optimistic simulator and (2) a threaded simulator which uses a single priority (SQ) queue for each thread. Our multithreaded simulator is shown to achieve superior performance to these simulators. © 2015 ACM.

关键词： multiple thread pdes stochastic neuronal simulation

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Load-balanced and Energy-efficient Coverage of Dispersed Events Using Mobile Sensor/Actuator Nodes

Load-balanced and Energy-efficient Coverage of Dispersed Eve...

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IEEE Global Communications Conference

作者： Wassila Lalouani Mohamed Younis Mohamed El-Amine CHERGUI Nadjib Badache High National School of Computing Science Dept. of Computer Science and Elect. Eng. University of Maryland Baltimore County USTHB Faculty of Mathematics Laboratory RECITS Department of Theories and Computer Engineering CERIST

ISBN: (纸本)9781479959532

We consider networks where mobile sensor/actor nodes move to specific locations in order to conduct data collection or deliver a response to an event. The challenge is to find the best tour for the mobile nodes in order to visit the given set of locations. In this paper, the objective of the optimization is to extend the node lifetime by emphasizing both path efficiency and balanced energy consumption when identifying and assigning tours to mobile nodes. Compared to existing schemes in the literature, we consider the initial position of mobile sensors when determining the tours. We formulate the optimization as a balanced multi-salesman travel problem and propose a solution based on a two-step approach. First, we determine the shortest tour that includes all event locations by forming the Hamiltonian cycle. Then, we formulate the optimal partitioning of such a cycle as a linear program (LP) where the objective is to reduce the tour length while minimizing the maximum tour a node has to make. For scalability and to expedite convergence, we propose a method for solving the LP formulation based on Branch & Price algorithm. The simulation results confirm the effectiveness of our optimization formulation and the advantage of our solution compared to competing schemes.

关键词： Sensor networks Sensor dispatch Mobile sensor/actors Tour optimization Sensor networks node lifetime Load balancing energy consumption Mobile travel Mobile nodes Hamiltonian circuit Energy efficiency Ganglia

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Recent advances in electromagnetic compatibility of 3D-ICs - Part i

Recent advances in electromagnetic compatibility of 3D-ICs -...

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作者： Sicard, Etienne Jianfei, Wu Shen, R.J. Li, Er-Ping Liu, En-Xiao Kim, J. Cho, Jonghyun Swaminathan, Madhavan INSA/GEI 135 Avenue de Rangueil 31077 Toulouse France School of Electronic Science and Engineering NUDT Changsha Hunan 410073 China Institute of High Performance Computing ASTAR 1 Fusionopolis Way Singapore 138632 Singapore Daejeon Korea Republic of John Pippin Department in Electromagnetics School of Electrical and Computer Engineering Interconnect and Packaging Center Georgia Institute of Technology AtlantaGA30332-0250 United States

Electromagnetic interference (EMI) issues are becoming crucial for three-dimensional integrated components which combine multi-core Systems-On-Chip, multi-band radio frequency circuits (RF), Giga-bit memories, as well as advanced analog circuits. In this first paper, the technology roadmap towards 3D-ICs is illustrated and the associated EMC challenges are described. This first paper also focuses on the role of interposers, associated electrical parasitics, and addresses concerns about signal and power integrity.

关键词： Electromagnetic compatibility

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WiG: WiFi-Based Gesture Recognition System

WiG: WiFi-Based Gesture Recognition System

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International Conference on computer Communications and Networks (ICCCN)

作者： Wenfeng He Kaishun Wu Yongpan Zou Zhong Ming Guangdong Province Key Laboratory of Popular High Performance Computers Shenzhen University China Shenzhen University Shenzhen Guangdong CN Department of Computer Science and Engineering Hong Kong University of Science and Technology

Most recently, gesture recognition has increasingly attracted intense academic and industrial interest due to its various applications in daily life, such as home automation, mobile games. Present approaches for gesture recognition, mainly including vision-based, sensor-based and RF-based, all have certain limitations which hinder their practical use in some scenarios. For example, the vision-based approaches fail to work well in poor light conditions and the sensor-based ones require users to wear devices. To address these, we propose WiG in this paper, a device-free gesture recognition system based solely on Commercial Off-The-Shelf (COTS) WiFi infrastructures and devices. Compared with existing Radio Frequency (RF)-based systems, WiG stands out for its systematic simplicity, extremely low cost and high practicability. We implemented WiG in indoor environment and conducted experiments to evaluate its performance in two typical scenarios. The results demonstrate that WiG can achieve an average recognition accuracy of 92% in line-of-sight scenario and average accuracy of 88% in the none-line-of sight scenario.

关键词： Gesture recognition Feature extraction Wireless communication Wireless sensor networks Support vector machines OFDM IEEE 802.11 Standard

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SPACE-TIME DISCONTINUOUS GALERKIN METHOD FOR MAXWELL EQUATIONS IN DISPERSIVE MEDIA

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Acta Mathematica Scientia 2014年第5期34卷 1357-1376页

作者：汪波谢资清张智民 College of Mathematics and Computer Science and Key Laboratory of High Performance Computing and Stochastic Information Processing (Ministry of Education of China) Hunan Normal University Beijing Computational Science Research Center Department of Mathematics Wayne State University

In this paper, a unified model for time-dependent Maxwell equations in dispersive media is considered. The space-time DG method developed in [29] is applied to solve the un-derlying problem. Unconditional L2-stability and error estimate of order O？τr＋1＋hk＋1/2？ are obtained when polynomials of degree at most r and k are used for the temporal dis-cretization and spatial discretization respectively. 2-D and 3-D numerical examples are given to validate the theoretical results. Moreover, numerical results show an ultra-convergence of order 2r＋1 in temporal variable t.

关键词： Maxwell equations dispersive media space-time DG method L2-stability L2-error estimate

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On the accuracy of the simplified Bernoulli trials collision algorithm in treating flows at nano scale and hypersonic regime

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AIP Conference Proceedings 2016年第1期1786卷

作者： Ehsan Roohi Stefan Stefanov 1High Performance Computing (HPC) Laboratory Department of Mechanical Engineering Ferdowsi University of Mashhad 91775-1111 Mashhad Iran 2Institute of Mechanics Bulgarian Academy of Science Acad. G. Bontchev str. 1113 Sofia Bulgaria

This paper reviews the accuracy of the Simplified Bernoulli Trial (SBT) algorithm and its variants, i.e., SBT-TAS (SBT on transient adaptive subcells) and ISBT (intelligence SBT) in the simulation of a wide spectrum of rarefied flow problems, including collision frequency ratio evaluation in the equilibrium condition, comparison of the Sonine-polynomial coefficients prediction in the Fourier flow with the theoretical prediction of the Chapman-Enskog expansion, accurate wall heat flux solution for the Fourier flow in the early slip regime, and hypersonic flows over cylinder and biconic geometries. We summarize advantages and requirements that utilization of the SBT collision families brings to a typical DSMC solver.

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Organ‐Mounted Electronics: An Universal and Easy‐to‐Use Model for the Pressure of Arbitrary‐Shape 3D Multifunctional Integumentary Cardiac Membranes (Adv. Healthcare Mater. 8/2016)

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Advanced Healthcare Materials 2016年第8期5卷

作者： Yewang Su Zhuangjian Liu Lizhi Xu State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China Department of Civil and Environmental Engineering Northwestern University Evanston IL 60208 USA Institute of High Performance Computing A*Star 138632 Singapore Department of Chemical Engineering and Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 USA Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA

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