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6th International Conference on Networking, ICN'07

作者： Shi, Dong Zhang, Xinming Gao, Xuemei Zhu, Wenbo Zou, Fengfu Department of Computer Science and Technology University of Science and Technology of China MOST Co-Key Laboratory of High Performance Computing and Its Application Anhui Province Hefei 230027 China

ISBN: (纸本)0769528058

Hosts in mobile ad hoc networks (MANET) are capable of self-configuration and they can migrate at will, which makes the network topology highly dynamic. Thus, routes may break easily since the data session fails when one node moves out of the sensing range of its partner. Besides that, if overused, nodes tend to drain their power completely due to the limited battery life. That will result in a short life span of the network, which means serious performance degradation. The routing maintenance in traditional routing protocols such as Dynamic Source Routing (DSR) is triggered only after an active routing path breaks and in most cases, is realized by a route discovery process to build a new route. This kind of "after-the-event" routing maintenance raises the overhead heavily since considerable cost has to be spent in detecting the path break and establishing a new one. In this paper, we propose a new routing maintenance mechanism named link reliability-aware route maintenance (LRRM). Implemented on DSR, our mechanism tries to evaluate the link reliability of each hop actively and replace those debilitated nodes with robust ones through a local recovery if necessary. After that, the route change shall be informed to the source node by unicasting. Simulation results have proven LRRM's validity in extending network lifetime. Our mechanism also outperforms original DSR in throughput, delivery ratio and average end-to-end latency. © 2007 IEEE.

关键词： Mobile telecommunication systems

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Explicit Multi-Symplectic Splitting Methods for the Nonlinear Dirac Equation

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Advances in Applied Mathematics and Mechanics 2014年第4期6卷 494-514页

作者： Yaming Chen Songhe Song Huajun Zhu Department of Mathematics and System Science and State Key Laboratory of High Performance Computing National University of Defense TechnologyChangsha 410073China State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China

In this paper,we propose two new explicit multi-symplectic splitting methods for the nonlinear Dirac(NLD)*** on its multi-symplectic formulation,the NLD equation is split into one linear multi-symplectic system and one nonlinear infinite Hamiltonian *** multi-symplectic Fourier pseudospectral method and multi-symplectic Preissmann scheme are employed to discretize the linear subproblem,*** the nonlinear subsystem is solved by a symplectic ***,a composition method is applied to obtain the final schemes for the NLD *** find that the two proposed schemes preserve the total symplecticity and can be solved *** experiments are presented to show the effectiveness of the proposed methods.

关键词： Nonlinear Dirac equation multi-symplectic method splitting method explicit method

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Improving the performance of PIR Protocol in Outsourced Databases

Improving the performance of PIR Protocol in Outsourced Data...

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International Conference on Computer technology and development

作者： Mane, Sunil B. Sinha, Pradeep K. Computer Engineering and Information Technology Department College of Engineering Pune M.S. India High Performance Computing Center for Development and Advance Computing Pune M.S. India

ISBN: (纸本)9781424488438

Outsourcing database as service instead of using in-house database management is a new trend emerging in a computing industry;there has been growing interest in outsourcing database services in both the commercial world and the research community. In this paper, we present analysis of non-concurrent model of fast single-database Private Information Retrieval (PIR) scheme for maintaining data privacy with data confidentiality using encryption algorithm like AES for Outsourced Database Service (ODBS) Model. In this model encryption method maintains data confidentiality and a utility that help to create PIR reply which maintains data privacy. In PIR Scheme data privacy is achieved by adding noise data into the result of a typical query which is called as PIR reply. Single-database PIR schemes are generally not practical because of its expensiveness from computational point of view. Here we propose a model that suggests the use of General-Purpose computation using Graphic Processing Units (GPGPU) commodity to process such type of computationally intensive operations. This model will help to achieve practical implementation of single-database PIR scheme which uses encryption algorithm to maintain data confidentiality as secondary goal and it serves to create database reply to maintain data privacy as primary goal. This paper shows some real time results that proves need of concurrency in PIR algorithms. It also describes the use of lattice based single-database PIR protocol with GPGPU as a processing unit to achieve high speed-up and hence, the performance of the system. © 2010 IEEE.

关键词： Data privacy

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Topology layout technology of energy internet 2nd

Topology layout technology of energy internet

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2nd International Workshop on high performance computing for Advanced Modeling and Simulation in Nuclear Energy and Environmental Science, HPCMS 2018, and 1st International Workshop on HPC Supported Data Analytics for Edge computing, HiDEC 2018 held at the 32nd ACM International Conference on Supercomputing, ACM ICS 2018

作者： Chen, Liandong Zhang, Boyao Liu, Fang Li, Jingquan Sun, Chenjun State Grid Hebei Electric Power Company Shijiazhuang China Department of High Performance Computing Technology and Application Development Computer Network Information Center Chinese Academy of Science Beijing China University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9789813299863

With the development of economy, the number of substations and the number of lines is continuously increasing, and the Energy Internet is becoming increasingly complex and changes frequently. It is more and more difficult to map the topology of energy grids used for large-scale dispatching by manpower. It is urgent to use computer-based collaborative systems and automated algorithms to solve the problem of Energy Internet topology layout. The current general practice is to manually draw a one-line diagram and manually configure the real-time amount. Under normal circumstances, adjustments have been made on existing one-line diagrams;due to factors such as complex grid structure and the number of rows that are generally arranged by screen size, etc. In some complex areas, it will become more and more difficult to increase substations, increase or adjust lines to meet the basic requirements of energy Internet topology, which has exceeded the manpower. The current Energy Internet expansion and transformation are more frequent, and the grid size is getting larger and larger, the corresponding automation transformation is also very frequent. It is determined that the topological layout of the energy Internet will also be updated frequently. At present, the wiring diagram production and maintenance of the Energy Internet are all completed manually. The pressure for manual production and adjustment of large-screen dispatches is increasing. It is eager to use computer-based collaborative systems and automated algorithms to solve the problem of frequent topology updates of energy Internet. This paper studies the topology theory of the Energy Internet, design and implementation of the topology algorithm of the Energy Internet. © Springer Nature Singapore Pte Ltd 2019.

关键词： Internet of Energy

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An EM method based on entropy LD block partition for haplotype inference

An EM method based on entropy LD block partition for haploty...

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2010 IEEE 5th International Conference on Bio-Inspired computing: Theories and applications, BIC-TA 2010

作者： Xu, Yun Wang, Ying Yao, Xiaohui Zhao, Yuzhong Department of Computer Science University of Science and Technology of China Hefei Anhui 230026 China Anhui Province-MOST Co-Key Laboratory of High Performance Computing and Its Application Hefei Anhui 230027 China

ISBN: (纸本)9781424464388

Genetic diseases have attracted much attention to the genetic research which depends on the data named haplotypes. Because of most haplotypes are generated from genotypes, haplotype inference (HI) problem becomes very popular. To solve this problem, we propose a new method based on EM and partition-ligation (PL) strategy. Compared to the previous methods, our algorithm uses the PL strategy based on multilocus linkage disequilibrium (LD), which has an advantage over the uniform block partition and pairwise LD. Considering the scale of data and the missing alleles, we also change the ligation strategy to control the complexity of time and space. The experimental results on the real data and the simulated data show that the algorithm in this paper has better performance than previous ones. © 2010 IEEE.

关键词： Maximum principle

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Insights into the nucleation,grain growth and phase transformation behaviours of sputtered metastableβ-W films

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Journal of Materials Science & technology 2021年第31期90卷 66-75页

作者： Shuqun Chen Jinshu Wang Ronghai Wu Zheng Wang Yangzhong Li Yiwen Lu Wenyuan Zhou Peng Hua Hongyi Lia Key Laboratory of Advanced Functional Materials Education Ministry of ChinaFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710129China High Performance Computing Department National Supercomputing Center in ShenzhenShenzhen 518055China China Ship Development and Design Center Wuhan 430074China

Metastable phase in tungsten film is of great interests in recent years due to its giant spin Hall effects,however,little information has been known on its nucleation,growth and phase *** this paper,a 900 nm-thick tungsten film with double-layer structure(α-W underlayer andβ-W above it)was produced on SiO_(2)/Si substrate by high vacuum magnetron sputtering at room *** structural properties ofβ-W were systemically investigated by X-ray diffraction,transmission electron microscopy,thermodynamic calculation,first-principle and phase-field *** is found that theβ-W nucleation is energetically favoured on the SiO_(2)surface compared to theα-W *** the film thickening proceeds,β-W[211]turns to be preferred direction of growth owing to the elastic strain energy minimization,which is verified by phase-field ***,theβ→αphase transformation takes place near the film-substrate interface while the rest of the film keeps theβ-W phase,leading to a doublelayer *** localized phase transition is induced by lower Gibbs free energy ofα-W phase at larger grain sizes,which can be confirmed by thermodynamic *** in-situ heating TEM analysis of the as-deposited film reveals that theβ→αphase transformation is fulfilled byα/βinterface propagation rather than local atomic *** findings offer valuable insights into the intrinsic properties of metastable phase in tungsten.

关键词： Metastable phases Tungsten Nucleation and growth Phase field modelling Phase transformation

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Electrical excitation pathways for graphene plasmons

Electrical excitation pathways for graphene plasmons

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Frontiers in Optics

作者： Ooi, Kelvin J. A. Chu, Hong Son Koh, Wee Shing Hsieh, Chang-Yu Tan, Dawn T. H. Ang, Lay Kee Engineering Product Development Singapore University of Technology and Design 20 Dover Drive 138682 Singapore Electronics and Photonics Department A STAR Institute of High Performance Computing 1 Fusionopolis Way #16-16 Connexis 138632 Singapore

We investigate and discuss the viability of graphene plasmons excited through the aloof-scattering of free electrons and inelastic electron tunneling. Excitation efficiencies may be potentially larger compared to that... 详细信息

ISBN: (纸本)1557522863

关键词： Graphene

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Polygonal mesh simplification with face color and boundary edge preservation using quadric error metric 4

Polygonal mesh simplification with face color and boundary e...

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4th International Symposium on Multimedia Software Engineering, MSE 2002

作者： Fahn, Chin-Shyurng Chen, Hung-Kuang Shiau, Yi-Haur Department of Computer Science and Information Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Electronic Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Software and Development Division National Center for High-Performance Computing Hsinchu300 Taiwan

ISBN: (纸本)0769518575

In applications such as scientific and medical visualization, highly detailed polygonal meshes are needed. Rendering these polygonal meshes usually exceeds the capabilities of graphics hardware. To improve rendering efficiency and maintain proper interactivity, the polygonal mesh simplification technique is commonly used to reduce the number of polygons of the mesh and construct a multiresolution representation. We propose a new and simple constraint scheme based on the quadric error metric proposed by Garland and Heckbert (1997, 1998) to preserve face colors and boundary edges during the simplification process. In addition, our method generates progressive meshes that store the polygonal mesh in a continuous multi-resolution representation. According to our experimental results, this new method is successful in preserving face colors and boundary edges. Moreover, we compare the latency of resolution changes for progressive meshes of various models. © 2002 IEEE.

关键词： Color

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Frequency aware and energy balancing data gathering algorithm for sensor networks

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Journal of Computational Information Systems 2007年第4期3卷 1381-1386页

作者： Li, Hong Huang, Liusheng Xu, Hongli Wang, Jichun Anhui Province-MOST Co-Key Lab. of High Performance Computing and Its Application Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 China

Data gathering algorithms proposed in the past always assumed that each sensor node had the same sampling frequency. While in real applications, different sensor nodes usually have different frequencies. A frequency aware and tree based data gathering algorithm (FET) was proposed. FET was especially designed for sensor networks which had two different sampling frequencies. The base station centrally executed FET to create an energy balancing tree with the base station as the root. FET added edges one by one to the tree, at each time only the edge which had the highest priority would be chosen. The edge's priority was based on two connecting nodes' frequencies and remaining energy. Simulation results showed that FET achieved notable energy balancing capability and got enhancement on energy efficiency.

关键词： Sensor networks

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Structural Pattern Analysis for Texture Synthesis

Structural Pattern Analysis for Texture Synthesis

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International Multi-Symposiums on Computer and Computational Sciences (IMSCCS)

作者： Yizhe Li Guoliang Chen Qilong Zheng Department of Computer Science and Technology Anhui Province-MOST Co-Key Laboratory of High Performance Computing and Its Application University of Science and Technology Anhui China

Sample based texture synthesis allows the generation of arbitrarily sized textures based on a small sample image. One main drawback of the technique is that a new pixel or patch is selected only considering local information in the generated texture. Thus structural error can't assure to be avoided for structural textures. To accelerate texture synthesis process and to avoid structural mismatch in the output picture, we present in this paper a structural pattern analysis (SPA) algorithm and a texture synthesis method using the algorithm. The pattern analysis tool also quantizes the texture randomness in macro scope view. It can be used in other applications such as automatic texture classification and quality evaluation of synthesized texture. We illustrate our result with some examples

关键词： Pattern analysis application software Pattern recognition Acceleration Image processing Computer graphics Image analysis Large-scale systems Computer science Laboratories

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