检索结果-内蒙古大学图书馆

Exchange bias and magnetotransport properties in IrMn/NiFe/FeMn structures

Physical Review B 2008年第18期78卷 184413-184413页

作者： Z. B. Guo Y. H. Wu J. J. Qiu B. Y. Zong G. C. Han Data Storage Institute Agency for Science Technology and Research (A*STAR) DSI Building 5 Engineering Drive 1 Singapore 117608 Department of Electrical and Computer Engineering National University of Singapore Singapore 119260

For the double exchange-biased IrMn/NiFe/FeMn structures, the pinning directions at IrMn/NiFe and NiFe/FeMn interfaces were set either parallel or antiparallel to each other by field annealing. Exchange bias and magnetotransport properties in IrMn/NiFe/FeMn trilayers were studied and compared with those of IrMn/NiFe and NiFe/FeMn bilayers. The dependence of exchange bias on the thickness of NiFe layer was different for parallel and antiparallel pinnings. A remarkable increase in resistance was observed which should be attributed to domain-wall resistance induced by the twisted spin structure. The spin configuration of twisted spin structure was simulated by one-dimensional atomic model.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Energy-aware opcode design

Energy-aware opcode design

引用

IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： Balaji V. Iyer Jason A. Poovey Thomas M. Conte School of Computer Science College of Computing Georgia Institute of Technology Atlanta GA USA Department of Electrical & Computer Engineering North Carolina State University Raleigh NC USA

Embedded processors are required to achieve high performance while running on batteries. Thus, they must exploit all the possible means available to reduce energy consumption while not sacrificing performance. In this work, one technique to reduce energy is explored to intelligently design the instruction-opcodes of a processor based on a target-workload. The optimization is done using a heuristic that not-only minimizes switching between adjacent instructions, but also simplifies the decoding to reduce latches to save dynamic energy. On average, an optimized opcode is able to be decoded using 40-60% less latches in the decoder. In addition, it is shown that a decoder optimized for algorithms that had similar program structure, similar data-types or similar behavior exhibited consistent patterns of energy reduction. The techniques presented in this paper yield an average 10% reduction in the total dynamic energy. It is also shown that this heuristic can be used to achieve similar results on different issue-width processors.

关键词： Decoding Process design Instruction sets Embedded computing High performance computing Batteries Energy consumption computer science Educational institutions Design engineering

来源：评论

学校读者我要写书评

暂无评论

A graph theoretic approach in achieving robust peer-to-peer networking paradigm

A graph theoretic approach in achieving robust peer-to-peer ...

引用

Conference on Local computer Networks (LCN)

作者： H. Shafiei F. Hoseini A. Khonsari M. Ould-Khaoua School of Computer Science Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Department of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Computing Sciences University of Glasgow UK

In this paper, we proposed a graph theoretic approach employing an algorithmic method to construct constant-degree graphs possessing not only provably minimum diameter, but also maximum connectivity with respect to ot... 详细信息

关键词： Graph theory Peer to peer computing Network topology Topology Scalability Meteorology Eigenvalues and eigenfunctions

来源：评论

学校读者我要写书评

暂无评论

Accelerating advanced MRI reconstructions on GPUs 08

Accelerating advanced MRI reconstructions on GPUs

引用

2008 Conference on computing Frontiers, CF'08

作者： Stone, Sam S. Haldar, Justin P. Tsao, Stephanie C. Hwu, Wen-Mei W. Liang, Zhi-Pei Sutton, Bradley P. Center for Reliable and High-Performance Computing University of Illinois at Urbana-Champaign Urbana IL United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL United States Bioengineering Department Biomedical Imaging Center Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana IL United States

ISBN: (纸本)9781605580777

Computational acceleration on graphics processing units (GPUs) can make advanced magnetic resonance imaging (MRI) reconstruction algorithms attractive in clinical settings, thereby improving the quality of MR images across a broad spectrum of applications. At present, MR imaging is often limited by high noise levels, significant imaging artifacts, and/or long data acquisition (scan) times. Advanced image reconstruction algorithms can mitigate these limitations and improve image quality by simultaneously operating on scan data acquired with arbitrary trajectories and incorporating additional information such as anatomical constraints. However, the improvements in image quality come at the expense of a considerable increase in computation. This paper describes the acceleration of an advanced reconstruction algorithm on NVIDIA's Quadro FX 5600. Optimizations such as register allocating the voxel data, tiling the scan data, and storing the scan data in the Quadro's constant memory dramatically reduce the reconstruction's required bandwidth to off-chip memory. The Quadro's special functional units provide substantial acceleration of the trigonometric computations in the algorithm's inner loops, and experimentally-tuned code transformations increase the reconstruction's performance by an additional 20%. The reconstruction of a 3D image with 1283 voxels ultimately achieves 150 GFLOPS and requires less than two minutes on the Quadro, while reconstruction on a quadcore CPU is thirteen times slower. Furthermore, relative to the true image, the error exhibited by the advanced reconstruction is only 12%, while conventional reconstruction techniques incur error of 42%. In short, the acceleration afforded by the GPU greatly increases the appeal of the advanced reconstruction for clinical MRI applications. Copyright 2008 ACM.

关键词： Magnetic resonance imaging

来源：评论

学校读者我要写书评

暂无评论

A Combinatorial Approach for Key-Distribution in Wireless Sensor Networks

A Combinatorial Approach for Key-Distribution in Wireless Se...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： H. Shafiei A. Mehdizadeh A. Khonsari M. Ould-Khaoua School of Computer Science Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Department of Computer Engineering Amirkabir University of Technology슠 Tehran Iran Department of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Computing Sciences University of Glasgow UK

Sensor nodes are usually deployed in adversarial environments in which they are subject to compromise and revelation of critical information rendering the entire network useless. Therefore, secure communication of wireless sensor networks (WSNs) necessitates utilization of efficient key distribution schemes. Over the past few years, several works using probabilistic, deterministic and hybrid methods have been conducted to address key distribution among sensor nodes. In this paper we propose a novel method to deterministically distribute key-chains throughout a WSN utilizing expander graphs based on the Zig-Zag graph product. Given a set of constraints such as network size, amount of storage, radio range and key-chain length, we are able to efficiently construct a resilient yet scalable key distribution graph. The main advantage of the obtained method is providing a more user-adjustable and predictable framework compared to the previously proposed approaches. Simulation results demonstrate the efficiency of our proposed scheme and its general applicability to different network paradigms with diverse requirements.

关键词： Wireless sensor networks Resilience computer networks Scalability Graph theory Wireless communication Security computer science Impedance Intrusion detection

来源：评论

学校读者我要写书评

暂无评论

A newborn screening system based on Service-Oriented Architecture embedded Support Vector Machine

A newborn screening system based on Service-Oriented Archite...

引用

4th IEEE International Symposium on Service-Oriented System engineering, SOSE 2008

作者： Hsieh, Sung-Huai Hsieh, Sheau-Ling Chien, Yin-Hsiu Wang, Zhenyu Weng, Yung-Ching Lai, Feipei Information Systems Office National Taiwan University Hospital Taipei Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan Network and Computer Centre National Chiao Tung University Hsin Chu Taiwan Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taiwan Department of Medical Genetics National Taiwan University Hospital Taiwan Computing Laboratory Oxford University Oxford United Kingdom

ISBN: (纸本)9780769534992

The clinical symptoms of metabolic disorders are rarely apparent during the neonatal period, and if they are not treated early, irreversible damage, such as mental retardation, or even death, may occur. Therefore, the practice of newborn screening is important to the prevention of permanent disabilities in newborns. In this paper, we propose a newborn screening system that uses Support Vector Machine (SVM) classification techniques to evaluate raw data on the concentrations of metabolic substances obtained from tandem mass spectrometry (MS/MS) to determine if a newborn has a metabolic disorder. As per the concept of Service-Oriented Architecture (SOA), we designed the system using web services techniques, which are suitable for integrating heterogeneous platforms, protocols, and applications. It can be integrated seamlessly into National Taiwan University Hospital Information Systems (HIS) or other related HIS. © 2008 IEEE.

关键词： Web services

来源：评论

学校读者我要写书评

暂无评论

Crystalline Amorphous Semiconductor Superlattice

引用

Physical Review Letters 2008年第13期100卷 136101-136101页

作者： T. C. Chong L. P. Shi X. Q. Wei R. Zhao H. K. Lee P. Yang A. Y. Du Data Storage Institute A⋆STAR (Agency for Science Technology and Research) Singapore 117608 Electrical Computer Engineering Department National University of Singapore Singapore 117576 Singapore Synchrotron Light Source (SSLS) National University of Singapore Singapore 117603 Institute of Microelectronics A⋆STAR (Agency for Science Technology and Research) Singapore 117685

A new class of superlattice, crystalline amorphous superlattice (CASL), by alternatively depositing two semiconductor materials, is proposed. CASL displays three states depending on the component materials’ phase: both polycrystalline phases, both amorphous phases, and one polycrystalline phase while another amorphous phase. Using materials capable of reversible phase transition, CASL can demonstrate reversibility among three states. GeTe/Sb2Te3 CASL has been synthesized and proved by x-ray reflectometry and TEM results. The reversible transition among three states induced by electrical and laser pulse was observed. The changes in the optical absorption edge, electrical resistivity, thermal conductivity, and crystallization temperature as a function of layer thickness are interpreted as quantum or nanoeffects. The unique properties of CASL enable the design of materials with specific properties.

关键词： Crystalline materials

来源：评论

学校读者我要写书评

暂无评论

Semantic Technologies in System Maintenance (STSM 2008)

Semantic Technologies in System Maintenance (STSM 2008)

引用

IEEE Workshop on Program Comprehension

作者： Juergen Rilling René Witte Dragan Gaševic Jeff Z. Pan Department of Computer Science and Software Engineering Concordia University Montréal Québec Canada University of Karlsruhe Institute for Program Structures and Data Organization (IPD) Karlsruhe Germany Department of Computing Science Aberdeen The University of Aberdeen Scotland UK

This paper gives a brief overview of the international workshop on semantic technologies in system maintenance. It describes a number of semantic technologies (e.g., ontologies, text mining, and knowledge integration techniques) and identifies diverse tasks in software maintenance where the use of semantic technologies can be beneficial, such as traceability, system comprehension, software artifact analysis, and information integration.

关键词： Ontologies Software maintenance Space technology Application software Semantic Web Logic programming computer science OWL Software engineering Information systems

来源：评论

学校读者我要写书评

暂无评论

An Energy Efficient, Low Cost, Hybrid Storage System Based on Utility

An Energy Efficient, Low Cost, Hybrid Storage System Based o...

引用

Japan-China Joint Workshop on Frontier of computer science and Technology (FCST)

作者： Lingfang Zeng Dan Feng Bharadwaj Veeravalli Qingsong Wei Key Laboratory of Information Storage Ministry of Education Huazhong University of Science and Technology China Department of Electrical and Computer Engineering National University of Singapore Singapore Data Storage Institute Singapore

To get large disk-like characteristics and offset the significant power demands of hard disk drives, we propose a fully functional hybrid archive system (called Pseudodisk) composed of an array of disks and a tape library. To get an energy conservation, low cost archive system, Pseudodisk uses data value model and utility function to guild data management. Two novel algorithms are proposed for data placement and data migration, which are referred to as utility-based data placement (UDP) and and system utility percentage (SUP) algorithms respectively. To validate the efficiency of the proposed archive system, we conduct the performance evaluation and the power-saving simulation.

关键词： Energy efficiency Energy storage Power demand Hard disks Libraries Energy conservation Cost function Power system modeling Energy management Power system management

来源：评论

学校读者我要写书评

暂无评论

Overlapped Layers for Prolonging Network Lifetime in Multi-Hop Wireless Sensor Networks

Overlapped Layers for Prolonging Network Lifetime in Multi-H...

引用

International Conference on Information Technology: New Generations (ITNG)

作者： Hongyan Wang Mei Yang Yingtao Jiang Shupeng Wang Laximi Gewali Department of Electrical and Computer Engineering University of Nevada Las Vegas NV USA Institute of Computing Technology Chinese Academy and Sciences Beijing China School of Computer Science University of Nevada Las Vegas NV USA

In this paper, the bottleneck problem in PRMC-based wireless sensor networks is studied. This problem can be solved by overlapping neighboring layers. By this way, more cluster head candidates are available for each layer and the intra-cluster communication energy can be reduced, which ultimately helps prolonging network life time. Through analysis and numeric results, the reasonable overlapped ranges are decided such that the energy consumption among the cluster heads of different layers is balanced. Simulation results with the selected overlapped ranges confirm that overlapping neighboring layers balances the energy consumption among cluster heads of different layers and prolongs network life time.

关键词： Spread spectrum communication Wireless sensor networks Energy consumption Telecommunication traffic Large-scale systems Energy efficiency Relays Routing Batteries Information technology

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：