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Analysis of magnetic mechanisms of 3d-doped ZnO diluted magnetic semiconductors by an abnormal peak on M-T curve

Chinese science Bulletin 2007年第20期52卷 2742-2746页

作者： PENG YingZi THOMAS Liew YE ZhiZhen ZHANG YinZhu nstitute of Materials and Physics School of Science Hangzhou Dianzi University Hangzhou 310018 China Data Storage Institute DSI Building 5 Engineering Drive 1 Singapore 117608 Singapore Department of Electrical and Computer Engineering National University of Singapore 119260 Singapore State Key Lab of Silicon Materials Zhejiang University Hangzhou 310027 China

The crystallographic structures and magnetic properties of a Zn0.95Co0.05O thin film deposited on a C-sapphire substrate using a dual-beam pulsed laser deposition method were characterized. It was shown from crystallographic analysis that the film belongs to the wurtzite structure with the C-axis aligned with that of the substrate. Magnetic hysteresis loops were observed till up to room temperature. A small peak around 55 K was noticed on the magnetization vs. temperature curve. The corresponding temperature of the small peak is close to that of ‘the abnormal peak’ reported by X.M. Zhang et al. From the results obtained, no correlation was found between the abnormal peak and the quantum effects. The magnetic behaviors in the Zn0.95Co0.05O film cannot be explained by the ferromagnetism in diluted magnetic semiconductors. The magnetic mechanisms in ZnO-based diluted magnetic semiconductors are also discussed.

关键词：弱磁半导体抗磁性氧化锌性能

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Physically Based Simulation of Fluid Mixtures

Physically Based Simulation of Fluid Mixtures

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IEEE International Conference on computer-Aided Design and computer Graphics

作者： Enhua Wu State Key Lab of Computer Science Institute of Software Chinese Academy and Sciences Beijing China Department of Computer and Information Science Faculty of Science and Technology University of Macau Macau Macao China

In our work, we mainly use a lattice Boltzmann method (LBM) to simulate the underlying dynamics of miscible mixtures in binary fluid simulation called TFLBM. However, it suffers from the limitation of only resolving mixture flows with low Reynolds number, and it would blow up when the Reynolds number gets higher. In order to resolve such mixture flows with higher Reynolds number, by further investigation, we proposed to use a subgrid method to stabilize the computation of two fluid mixtures. The idea of the subgrid method is to split the actual velocity field into large-scale (resolved) and small-scale (unresolved) components. The effect of the unresolved motion on the resolved one is included by introducing a so-called eddy viscosity, and the method is also referred to as large eddy simulation (LES).

关键词： Computational modeling Stress Fluid dynamics Graphics Computational fluid dynamics Force control computer simulation computer science Physics computing Information science

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B-spline Surfaces of Clustered Point Sets with Normal Maps

B-spline Surfaces of Clustered Point Sets with Normal Maps

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10th IEEE International Conference on computer Aided Design and computer Graphics(第十届CAO/Graphics国际会议)

作者： Yanci Zhang Hanqiu Sun Enhua Wu State Key Lab.of Computer Science Institute of SoftwareChinese Academy of Sciences Department of Computer Science and EngineeringThe Chinese University of Hong Kong Faculty of Science and TechnologyUniversity of Macau

In this paper,we propose a novel method that represents the highly-complex point sets by clustering the points to normal-mapped B-spline surfaces (NBSs). The main idea is to construct elaborate normal maps on simple surfaces for the realistic rendering of complex point-set models. Based on this observation,we developed the coarse,normal-mapped B-spline surfaces to approximate the original point datasets with fine surface details. In our algorithm,a genetic clustering algorithm is proposed to automatically segment the point samples into several clusters according to their statistical properties,and a network of B-spline patches with normal maps are constructed according to the clustering results. Our experimental results show that this representation facilitates the modeling and rendering of complex point sets without losing the visual qualities.

关键词： Spline Surface reconstruction Signal processing algorithms Surface fitting Clustering algorithms computer science Sampling methods Frequency Sun Genetics

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ANT COLONY OPTIMIZATION METHODFOR MULTIPLE SEQUENCE ALIGNMENT

ANT COLONY OPTIMIZATION METHODFOR MULTIPLE SEQUENCE ALIGNMEN...

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2007 International Conference on Machine Learning and Cybernetics(IEEE第六届机器学习与控制论国际会议)

作者： LING CHEN WEI LIU JUAN CHEN Department of Computer Science Yangzhou University Yangzhou China State Key Lab of Novel Software Department of Computer Science Yangzhou University Yangzhou China Yangzhou Institute of Electronic Technology Yangzhou China

Among all the methods for multiple sequence alignment, progressive alignment is the most popular technique because of its simplicity and *** main drawback of progressive alignment is that the errors occurring in early stages can not be corrected in later *** this paper, we propose a novel algorithm called ProAnt which combines ant colony optimization and progressive alignment to improve the accuracy of alignment To avoid the errors occurring in the early stage, the algorithm first calculates the posterior probability of all pairs of characters using ant colony optimization and probabilistic consistency *** the algorithm computes the final alignment using progressive method where the matching score of character pair is replaced by their posterior *** results on data from the BAliBASE database show that our algorithm can obtain much more accurate results and higher speed than the other progressive alignment method.

关键词： Bioinformatics Ant colony optimization Multiple sequences alignment

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Approximation of Circular Arcs by C2 Cubic Polynomial B-splines

Approximation of Circular Arcs by C2 Cubic Polynomial B-spli...

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10th IEEE International Conference on computer Aided Design and computer Graphics(第十届CAO/Graphics国际会议)

作者： Wu Yang Xiuzi Ye Laboratory of Image Science & Technology School of Computer Science & Engineering Southeast Universi College of Computer Science/State Key Lab of CAD&CG Zhejiang University Hangzhou310027P.R.China So

An algorithm to approximate circle/circular arc with C2 cubic B-spline curve is presented. Given a prescribed tolerance ∈,the algorithm can find a C2 cubic B-spline curve with minimal number of segments that approximate the given circle/circular arc within ∈. The method developed can be used for various applications in CAD/CAM,Biomechanical Engineering and other fields.

关键词： Spline Polynomials computer science Design automation computer aided manufacturing CADCAM laboratories Educational institutions Application software Surface topography

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Trusted Computing Enabled Access Control for Virtual Organizations

Trusted Computing Enabled Access Control for Virtual Organiz...

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International Conference on Computational Intelligence and Security Workshops (CISW)

作者： Jing Zhan Huanguo Zhang School of Computer Science Wuhan University of China Wuhan China State Key Lab of Software Engineering Wuhan University of China Wuhan China

Grid computing is becoming the prominent paradigm for resource exchange and collaboration, which are supported by dynamic, multi-institutional virtual organizations (VOs) overcoming limitations of time or space. As the de-facto standard for grid security, grid security infrastructure provides no effective mechanism to protect both resource providers and users from access of malicious entities. The trusted computing (TC) technology adopted by the trusted computing group (TCG) defines that an entity can be trusted as long as it always behaves in the expected manner. Specifically, the TC uses a hardware module called trusted platform module (TPM) to ensure the tamper-proof attestative behavior by integrity measurement, logging and report. In this paper, we propose and design a TC enabled system based on Linux and TPM hardware to enforce access control policy for the VO.

关键词： Access control Hardware Information security Grid computing Resource management computer security Collaborative work Space technology Protection Linux

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A Parallel Framework for Interactive Rendering of Massive Complex Scenes on PCs Cluster

A Parallel Framework for Interactive Rendering of Massive Co...

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International Conference on Image and Graphics (ICIG)

作者： Xiaohong Jiang Kaibin Lei Hua Xiong Yan Li Jiaoying Shi College of Computer Science University of Zhejiang Hangzhou China College of Computer Science & Tehcnology Southwest University of Nationalities of China Chengdu China State Key Lab of CAD&CG University of Zhejiang Hangzhou China

This paper present a parallel framework for interactively rendering massive complex scenes on PCs cluster. The framework integrates parallel rendering, scene graph, software acceleration techniques, and out-of-core data management. We propose a novel parallel rendering architecture based on dynamic rendering team and hybrid rendering pipeline to balance work load and to handle different graphics primitive distribution. A unified scene graph representation is designed for flexible object manipulation in upper applications and efficient rendering in lower rendering pipeline. We present a priority-based out-of-core data management scheme which guarantees fixed memory footprint and data scheduling efficiency. We have implemented this framework and developed two applications to test its performance on a cluster of 32 PCs: a walkthrough application for massive complex scenes and a distributed multi- player video game.

关键词： computer graphics Layout Personal communication networks Rendering (computer graphics) Pipelines Acceleration computer architecture Application software Memory management Testing

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Quantification of natural surveillance in urban areas for crime prevention using vehicle-borne laser scanners

Quantification of natural surveillance in urban areas for cr...

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10th International Conference on computers in Urban Planning and Urban Management, CUPUM 2007

作者： Tanaka, Hideto Zhao, Huijing Chen, Yuzhong Shibasaki, Ryosuke Japan Urban Security Research Institute P.O. Box 2517 Tokyo Opera City Tokyo 163-1408 Japan State Key Lab of Machine Perception School of Electronics Engineering and Computer Science Peking University Beijing 100871 China Center for Spatial Information Science University of Tokyo 5-1-5 Kashiwanoha Kashiwa-shi Chiba 277-8568 Japan

ISBN: (纸本)9788585205775

This research aims to quantify natural surveillance in urban areas, an important factor for Crime Prevention Through Environmental Design (CPTED), with high resolution. This quantification considers the effect of detailed configurations of geographical features such as buildings, trees, and fences, which are difficult to model with CAD-based design, on visibility. We define natural surveillance as visibility from roads, and measure such visibility in urban areas by using laser scanning systems borne on a motor vehicle or a hand truck. Visibility can be measured by supposing a laser beam as a human gaze. The measured areas include a neighborhood known to have a high rate of invasion theft and a crime prevention model district in Japan. The results are visualized in 2-D and 3-D space, and the effect of the detailed configurations of geographical features on visibility can be recognized. We propose that a vehicle-borne laser scanning system is useful for measuring natural surveillance in urban areas.

关键词： Scanning

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Demonstration of a task-flow based aircraft collaborative design application in optical grid 33

Demonstration of a task-flow based aircraft collaborative de...

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2007 33rd European Conference and Exhibition of Optical Communication, ECOC 2007

作者： Wang, Zhengyu Guo, Wei Sun, Zhenyu Jin, Yaohui Sun, Weiqiang Hu, Weisheng Lin, Xinhua Wu, Min-You Liu, Hong Fu, San Yuan, Jun Qiao, Chunming State Key Lab. on Fiber-Optic Local Area Networks and Advanced Optical Communication systems Shanghai JiaoTong University Shanghai200240 China Grid Computing Center Shanghai JiaoTong University Shanghai200240 China Institute of Aerospace Science and Technology Shanghai JiaoTong University Shanghai200240 China Shanghai Supercomputer Center Shanghai201203 China Computer Science and Engineering State University of New York BuffaloNY14260 United States

One task-flow scheduler has been designed to optimally allocate resources for a task-flow based Aircraft Collaborative Design Application in Optical Grid. This scheduler and application has been deployed on an Optical... 详细信息

ISBN: (纸本)9783800730421

关键词： Scheduling

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On accurate task scheduling in Optical Grid

On accurate task scheduling in Optical Grid

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International Symposium on Advanced Networks and Telecommunication Systems (ANTS)

作者： Zhengyu Wang Wei Guo Zhenyu Sun Yaohui Jin Weiqiang Sun Weisheng Hu Chunming Qiao State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiaotong University Shanghai China Department of Computer Science & Engineering State University of New York University at Buffalo NY USA

This paper experimentally studies the accurate task scheduling in optical grid. The practical data transfer scenario and task execution scenario in optical grid have been investigated and modeled. Scheduling algorithm... 详细信息

ISBN: (纸本)9781424418596

关键词： Fiber optics Optical fibers Accuracy Processor scheduling Optical fiber networks Optical fiber communication Optical switches

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