检索结果-南通市图书馆

A user-space file system for on-demand legacy desktop software

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china({2. sciences) 2011年第6期54卷 1142-1150页

作者： ZHANG YouHui 1,2., SU GeLin 1,2.& ZHENG WeiMin 1,2.1 Department of Computer science and technology, {2. University, beijing 100084, china 2.tsinghua National laboratory for information science and technology, {2. University, beijing 100084, china Department of Computer science and technology Tsinghua University Beijing China tsinghua National laboratory for {2. science and technology Tsinghua University Beijing China

Some user-level virtualization technologies have been used to convert legacy software (like the existing Windows desktop applications) into the on-demand software without any modification. To give the client a friendly and compatible method to access on-demand legacy software across the Internet, this paper presents a clientend file system for this usage case. It is a Windows user-space file system based on the cloud storage (where the on-demand software is stored), which converts the local file system accesses into remote visits. Quite a few optimizations are adopted and adjusted to suit the file-access-pattern of on-demand software, including the local cache, metadata/data/software prefetch and content-addressable storage (CAS), to decrease the number of remote visits and/or to overlap IO (input/output) operations with software execution. Detailed access-pattern analyses are also presented. This file system has been implemented and tests show that it is practical for much daily-used software-a local cache of limited size can provide up to 80% hit ratio and the corresponding overhead of running-time is about 37%. Owing to this method, on any compatible and networked computer, a user can use his/her personalized software conveniently although it does not exist on the local host.

关键词： on-demand software software as a service user-space file system cloud storage

Fusion tracking in color and infrared images using joint sparse representation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china({2. sciences) 2012年第3期55卷 590-599页

作者： LIU HuaPing1,2.3 & SUN FuChun1,2.3 1Department of Computer science and technology, {2. University, beijing 100084, china 2.tate Key laboratory of Intelligent technology and Systems, beijing 100084, china 3{2. National laboratory for information science and technology, beijing 100084, china Department of Computer science and technology Tsinghua University Beijing China State Key laboratory of Intelligent technology and Systems Beijing China tsinghua National laboratory for {2. science and technology Beijing China

Currently sparse signal reconstruction gains considerable interest and is applied in many fields. In this paper, a similarity induced by joint sparse representation is designed to construct the likelihood function of particle filter tracker so that the color visual spectrum and thermal spectrum images can be fused for object tracking. The proposed fusion scheme performs joint sparse representation calculation on both modalities and the resultant tracking results are fused using min operation on the sparse representation coefficients. In addition, a co-learning approach is proposed to update the reference templates of both modality and enhance the tracking robustness. The proposed fusion scheme outperforms state-of-the-art approaches, and its effectiveness is verified using OTCBVS database.

关键词： joint sparse representation fusion tracking color image infrared image

Buffer planning for application-specific networks-on-chip design

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science in china(Series F) 2009年第4期52卷 547-558页

作者： YIN ShouYi1,2.LIU LeiBo1,2.& WEI ShaoJun1,2.1 Institute of Microelectronics,tsinghua University,beijing {2.,china 2.National laboratory for information science and technology,tsinghua University,beijing {2.,china Institute of Microelectronics Tsinghua University Beijing China National laboratory for information {2. and technology Tsinghua University Beijing China

Networks-on-chip （NoC） is a promising communication architecture for next generation SoC. The size of buffer used in on-chip routers impacts the silicon area and power consumption of NoC dominantly. It is important to plan the total buffer-size and each router buffer-allocation carefully for an efficient NoC design. In this paper, we propose two buffer planning algorithms for application-specific NoC design. More precisely, given the traffic parameters and performance constraints of target application, the proposed algorithms automatically determine minimal buffer budget and assign the buffer depth for each input channel in different routers. The experimental results show that the proposed algorithms can significantly reduce total buffer usage and guarantee the performance requirements.

关键词： buffer planning networks-on-chip (NoC) design automation optimization

Influence of magnetic current on the ground state entanglement in an isotropic transverse XY chain

在线全文

学校读者我要写书评

暂无评论

Progress in Natural science:Materials International 2007年第10期17卷 1147-1151页

作者： Liu Dan1,2., Zhang Yong3 and Long Guilu1,2.1. Key laboratory for Atomic and Molecular Nanosciences, and Department of Physics, {2. University, beijing 100084, china 2. Center of Quantum information science and technology, {2. National laboratory for information science and technology, beijing 100084, china 3. Institute of Physics, School of sciences, beijing University of Posts and Telecommunications, beijing 100876, china) Key laboratory for Atomic and Molecular Nanosciences Department of Physics Tsinghua University Beijing 100084 China Center of Quantum information science and {2. Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China Institute of Physics School of Sciences Beijing University of Posts and Telecommunications Beijing 100876 China

We study the ground state entanglement in a three-qubit XY chain under the influence of a magnetization current. It is found that the ground state changes from a W state to a disentangled state as the magnetic field varies. When the Lagrange multiplier λ>3, namely under a strong magnetic current, the ground state holds onto a W state for a large range of the magnetic field strength. A phase transition to the magnetization-current phase occurs under a certain condition.

关键词： Heisenberg-XY chain magnetic-current phase transition.

RRM:An incentive reputation model for promoting good behaviors in distributed systems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science in china(Series F) 2008年第11期51卷 1871-1882页

作者： ZHANG Hong1,2.DUAN HaiXin1,3 & LIU Wu1,3 1 tsinghua National laboratory for {2. science and technology,tsinghua University,beijing 100084,china 2.Department of Computer science and technology,tsinghua University,beijing 100084,china 3 Network Research Center,tsinghua University,beijing 100084,china tsinghua National laboratory for {2. science and technology Tsinghua University Beijing China Department of Computer science and technology Tsinghua University Beijing China Network Research Center Tsinghua University Beijing China

Reputation systems represent soft security mechanisms that complement traditional information security mechanisms. They are now widely used in online e-commerce markets and communities in order to stimulate good behaviors as well as to restrain adverse behaviors. This paper analyzes the limitations of the conversational reputation models and proposes an incentive reputation model called the resilient reputation model （RRM） for the distributed reputation systems. The objective of this reputation model is not only to encourage the users to provide good services and, therefore, to maximize the probability of good transaction outcomes, but also to punish those adverse users who are trying to manipulate the application systems. The simulation results indicate that the proposed reputation model （RRM） could effectively resist against the common adverse behaviors, while protecting the profits of sincere users from being blemished by those adversaries.

关键词： reputation model distributed system trust soft security

Real-time reliability prediction for dynamic systems with both deteriorating and unreliable components

在线全文

学校读者我要写书评

暂无评论

science in china(Series F) 2009年第11期52卷 2234-2246页

作者： XU ZhengGuo1,2. JI YinDong2.3 & ZHOU DongHua1,2. 1 Department of Automation, tsinghua University, beijing 100084,{2. 2.tsinghua National laboratory for information science and technology, tsinghua University, beijing 100084,{2. 3 Research Institute of information technology (RIIT), tsinghua University, beijing 100084,{2. Department of Automation Tsinghua University Beijing China tsinghua National laboratory for {2. science and technology Tsinghua University Beijing China Research Institute of information technology (RIIT) Tsinghua University Beijing China

As an important technology for predictive maintenance, failure prognosis has attracted more and more attentions in recent years. Real-time reliability prediction is one effective solution to failure prognosis. Considering a dynamic system that is composed of normal, deteriorating and unreliable components, this paper proposes an integrated approach to perform real-time reliability prediction for such a class of systems. For a deteriorating component, the degradation is modeled by a time-varying fault process which is a linear or approximately linear function of time. The behavior of an unreliable component is described by a random variable which has two possible values corresponding to the operating and malfunction conditions of this component. The whole proposed approach contains three algorithms. A modified interacting multiple model particle filter is adopted to estimate the dynamic system＇s state variables and the unmeasurable time-varying fault. An exponential smoothing algorithm named the Holt＇s method is used to predict the fault process. In the end, the system＇s reliability is predicted in real time by use of the Monte Carlo strategy. The proposed approach can effectively predict the impending failure of a dynamic system, which is verified by computer simulations based on a three-vessel water tank system.

关键词： reliability failure prognostics dynamic systems fault prediction particle filtering interacting multiple model exponential smoothing,predictive maintenance

Theoretical research progress in new-generation Internet architecture

在线全文

学校读者我要写书评

暂无评论

science in china(Series F) 2008年第11期51卷 1634-1660页

作者： WU JianPing1,2.3,LIU Ying2.3 & WU Qian2.3 1 Department of Computer science,tsinghua University,{2. 100084,china 2.Network Research Center,tsinghua University,{2. 100084,china 3 tsinghua National laboratory for information science and technology(TNList) ,{2. 100084,china Department of Computer science Tsinghua University Beijing China Network Research Center Tsinghua University Beijing China tsinghua National laboratory for {2. science and technology (TNList) Beijing China

Internet has become the most important information infrastructure supporting modern socio-economic development, social progress and technological Innovation. Invented 30 years ago, today Internet is facing increasingly severe technical challenges. This paper introduces the progress of the major international newgeneration Internet research plans; analyzes its basic characteristics and the principal contradictions during the development; detsiledly introduces the research carried out by 973 Project ＂Research of Future Internet Architecture＂ on the key scientific issues of new-generation Internet architecture and its latest research results; and looks to the future of the research-focus faced with the new situations of the basic research of new-generation Internet architecture as well as the new demands of innovative applications on Internet architecture.

关键词： new-generation Internet network architecture multi-dimension scalability

Self-healing routing: failure,modeling and analysis

在线全文

学校读者我要写书评

暂无评论

science china({2. sciences) 2011年第3期54卷 609-622页

作者： XU MingWei 1,2., LI Qi 1,2., YANG Yuan 1,2., HOU MeiJia 1,2.& PAN LingTao 1,2.1 Department of Computer science, tsinghua University,{2., china 2.tsinghua National laboratory for information science and technology (TNList),{2., china Department of Computer science Tsinghua University Beijing China tsinghua National laboratory for {2. science and technology (TNList) Beijing China

Network failures occur frequently, and self-healing ability of existing routing protocols cannot guarantee fast route convergence under these failures without impacting packet forwarding. During routing convergence, network routes may be incorrect and even routing black holes and loops occur, which will result in extensive packet loss and thus influence network performance. To solve this problem, several improved routing solutions have been proposed. In this paper, we propose the concept and model of self-healing routing and analyze the key problems in current intra-domain and inter-domain self-healing routing protocols after briefly reviewing the characteristics of network failures. We classify the different self-healing solutions into two categories based on their design principles: routing restoration and routing protection, and systematically analyze these different typical solutions. Finally, we discuss several key issues in self-healing routing and propose a hybrid protection and restoration based routing scheme.

关键词： failure intra-domain routing inter-domain routing self-healing routing

A formal method to real-time protocol interoperability testing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science in china(Series F) 2008年第11期51卷 1723-1744页

作者： WANG ZhiLiang1,3,YIN Xia2.3 & JING ChuanMing2.3 1 Network Research Center,tsinghua University,beijing {2.,china 2.Department of Computer science and technology,tsinghua University,beijing {2.,china 3 tsinghua National laboratory for {12. science and technology(TNList) ,beijing {2.,china Network Research Center Tsinghua University Beijing China tsinghua National laboratory for {2. science and technology (TNList) Beijing China Department of Computer science and technology Tsinghua University Beijing China

Interoperability testing is an important technique to ensure the quality of implementations of network communication protocol. In the next generation Internet protocol, real-time applications should be supported effectively. However, time constraints were not considered in the related studies of protocol interoperability testing, so existing interoperability testing methods are difficult to be applied in real-time protocol interoperability testing. In this paper, a formal method to real-time protocol interoperability testing is proposed. Firstly, a formal model CMpTIOA （communicating multi-port timed input output automata） is defined to specify the system under test （SUT） in real-time protocol interoperability testing; based on this model, timed interoperability relation is then defined. In order to check this relation, a test generation method is presented to generate a parameterized test behavior tree from SUT model; a mechanism of executability pre-determination is also integrated in the test generation method to alleviate state space explosion problem to some extent. The proposed theory and method are then applied in interoperability testing of IPv6 neighbor discovery protocol to show the feasibility of this method.

关键词： protocol testing interoperability testing real-time testing test generation timed input output automata(TIOA)