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A UDDI Based Shared Resources Management Mechanism in Virtual Enetrprises 被引量:2
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作者 申德荣 Yu +8 位作者 Ge Chen Tian Yin Nan SONG Baoyan Dong Xiaomei 《High Technology Letters》 EI CAS 2003年第4期21-26,共6页
Service and information resources are two kinds of major shared resources in virtual enterprises, where, service resources include third party’s service resources and enterprise’s legacy service resources,and inform... Service and information resources are two kinds of major shared resources in virtual enterprises, where, service resources include third party’s service resources and enterprise’s legacy service resources,and information resources include database resources and file resources. Since service and information resources have distributed, autonomic, remotely bound as well as some other similar characteristics, an implementation mechanism on managing shared resources based on UDDI are presented. XML instances are used to describe resources authorization information, WSDL based special XML instance represents information resource metadata, and these XML instances are referenced by tModel for realizing the purpose of managing shared resources metadata based on UDDI. 展开更多
关键词 UDDI virtual enterprise XML distributed shared resources WSDL
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DESIGN AND IMPLEMENTATION OF SINGLE-BUFFERED ROUTERS
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作者 Hu Ximing Qu Jing +1 位作者 Wang Binqiang Wu Jiangxing 《Journal of Electronics(China)》 2007年第4期470-476,共7页
A Single-Buffered (SB) router is a router where only one stage of shared buffering is sandwiched between two interconnects in comparison of a Combined Input and Output Queued (CIOQ) router where a central switch f... A Single-Buffered (SB) router is a router where only one stage of shared buffering is sandwiched between two interconnects in comparison of a Combined Input and Output Queued (CIOQ) router where a central switch fabric is sandwiched between two stages of buffering. The notion of SB routers was firstly proposed by the High-Performance Networking Group (HPNG) of Stanford University, along with two promising designs of SB routers: one of which was Parallel Shared Memory (PSM) router and the other was Distributed Shared Memory (DSM) router. Admittedly, the work of HPNG deserved full credit, but all results presented by them appeared to relay on a Centralized Memory Management Algorithm (CMMA) which was essentially impractical because of the high processing and communication complexity. This paper attempts to make a scalable high-speed SB router completely practical by introducing a fully distributed architecture for managing the shared memory of SB routers. The resulting SB router is called as a Virtual Output and Input Queued (VOIQ) router. Furthermore, the scheme of VOIQ routers can not only eliminate the need for the CMMA scheduler, thus allowing a fully distributed implementation with low processing and commu- nication complexity, but also provide QoS guarantees and efficiently support variable-length packets in this paper. In particular, the results of performance testing and the hardware implementation of our VOIQ-based router (NDSC~ SR1880-TTM series) are illustrated at the end of this paper. The proposal of this paper is the first distributed scheme of how to design and implement SB routers publicized till now. 展开更多
关键词 Single-Buffered (SB) router Distributed shared Memory (DSM) Parallel shared Memory (PSM) Virtual Output and Input Queued (VOIQ) NDSC SR1880-T^TM router
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d-EMR:Secure and distributed Electronic Medical Record management
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作者 Ehab Zaghloul Tongtong Li Jian Ren 《High-Confidence Computing》 2023年第1期47-57,共11页
As more and more data is produced,finding a secure and efficient data access structure has become a major research issue.The centralized systems used by medical institutions for the management and transfer of Electron... As more and more data is produced,finding a secure and efficient data access structure has become a major research issue.The centralized systems used by medical institutions for the management and transfer of Electronic Medical Records(EMRs)can be vulnerable to security and privacy threats,often lack interoperability,and give patients limited or no access to their own EMRs.In this paper,we first propose a privilege-based data access structure and incorporates it into an attribute-based encryption mechanism to handle the management and sharing of big data sets.Our proposed privilege-based data access structure makes managing healthcare records using mobile healthcare devices efficient and feasible for large numbers of users.We then propose a novel distributed multilevel EMR(d-EMR)management scheme,which uses blockchain to address security concerns and enables selective sharing of medical records among staff members that belong to different levels of a hierarchical institution.We deploy smart contracts on Ethereum blockchain and utilize a distributed storage system to alleviate the dependence on the record-generating institutions to manage and share patient records.To preserve privacy of patient records,our smart contract is designed to allow patients to verify attributes prior to granting access rights.We provide extensive security,privacy,and evaluation analyses to show that our proposed scheme is both efficient and practical. 展开更多
关键词 Privilege-based access HIERARCHY Attribute-based encryption EMRs Distributed data sharing Blockchain Smart contract
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Development,application,and prospects for Chinese land observation satellites 被引量:11
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作者 Wen XU Jianya GONG Mi WANG 《Geo-Spatial Information Science》 SCIE EI 2014年第2期102-109,共8页
The launching of CBERS-01(China Brazil Earth Resource Satellite)in 1999,China’s first land observation satellite,signifies an unprecedented milestone in Chinese satellite remote sensing history.Since then,a large num... The launching of CBERS-01(China Brazil Earth Resource Satellite)in 1999,China’s first land observation satellite,signifies an unprecedented milestone in Chinese satellite remote sensing history.Since then,a large number of applications have been developed that drew upon solely CBERS-01 and other Chinese land observation satellites.The application development evolves from one satellite to multiple satellites,from one series of satellites to multiple series,from scientific research to industrial applications.Six aspects of the Chinese land observation satellite program are discussed in this paper:development status,data sharing and distribution,satellite calibration,industrial data applications,future prospects,and conclusion. 展开更多
关键词 Chinese land observation satellite data sharing and distribution satellite calibration industrial data applications
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Efficient Handling of Lock Hand-off in DSM Multiprocessors with Buffering Coherence Controllers 被引量:1
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作者 Benjamín Sahelices Agustín de Dios +2 位作者 Pablo Ibáez Víctor Vials-Yúfera José María Llabería 《Journal of Computer Science & Technology》 SCIE EI CSCD 2012年第1期75-91,共17页
Synchronization in parallel programs is a major performance bottleneck in multiprocessor systems. Shared data is protected by locks and a lot of time is spent on the competition arising at the lock hand-off. In order ... Synchronization in parallel programs is a major performance bottleneck in multiprocessor systems. Shared data is protected by locks and a lot of time is spent on the competition arising at the lock hand-off. In order to be serialized, requests to the same cache line can either be bounced (NACKed) or buffered in the coherence controller. In this paper, we focus mainly on systems whose coherence controllers buffer requests. In a lock hand-off, a burst of requests to the same line arrive at the coherence controller. During lock hand-off only the requests from the winning processor contribute to progress of the computation, since the winning processor is the only one that will advance the work. This key observation leads us to propose a hardware mechanism we call request bypassing, which allows requests from the winning processor to bypass the requests buffered in the coherence controller keeping the lock line. We present an inexpensive implementation of request bypassing that reduces the time spent on all the execution phases of a critical section (acquiring the lock, accessing shared data, and releasing the lock) and which, as a consequence, speeds up the whole parallel computation. This mechanism requires neither compiler or programmer support nor ISA or coherence protocol changes. By simulating a 32-processor system, we show that using request bypassing does not degrade but rather improves performance in three applications with low synchronization rates, while in those having a large amount of synchronization activity (the remaining four), we see reductions in execution time and in lock stall time ranging from 14% to 39% and from 52% to 7170, respectively. We compare request bypassing with a previously proposed technique called read combining and with a system that bounces requests, observing a significantly lower execution time with the bypassing scheme. Finally, we analyze the sensitivity of our results to some key hardware and software parameters. 展开更多
关键词 distributed shared memory multiprocessors synchronization buffer coherence controller request bypass
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Distributed Energy Sharing in Energy Internet Through Distributed Averaging 被引量:3
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作者 Yangyang Ming Jie Yang +2 位作者 Junwei Cao Ziqiang Zhou Chunxiao Xing 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2018年第3期233-242,共10页
This paper proposes a distributed averaging iteration algorithm for energy sharing in microgrids of Energy Internet based on common gossip algorithms. This algorithm is completely distributed and only requires communi... This paper proposes a distributed averaging iteration algorithm for energy sharing in microgrids of Energy Internet based on common gossip algorithms. This algorithm is completely distributed and only requires communications between neighbors. Through this algorithm, the Energy Internet not only allocates the energy effectively based on the load condition of grids, but also reasonably schedules the energy transmitted between neighboring grids. This study applies theoretical analysis to discuss the condition in which this algorithm can finally reach supply-and-demand balance. Subsequently, the related simulation validates the performance of the algorithm under various conditions. 展开更多
关键词 distributed averaging energy sharing gossip algorithm Energy Internet
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Evaluation of Remote-I/O Support for a DSM-Based Computation Offloading Scheme
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作者 Yuhun Jun Jaemin Lee Euiseong Seo 《Journal of Computer Science & Technology》 SCIE EI CSCD 2017年第5期957-973,共17页
Computation offloading enables mobile devices to execute rich applications by using the abundant computing resources of powerful server systems. The distributed shared memory based (DSM-based) computation offloading a... Computation offloading enables mobile devices to execute rich applications by using the abundant computing resources of powerful server systems. The distributed shared memory based (DSM-based) computation offloading approach is expected to be especially popular in the near future because it can dynamically migrate running threads to computing nodes and does not require any modifications of existing applications to do so. The current DSM-based computation offloading scheme, however, has focused on efficiently offloading computationally intensive applications and has not considered the significant performance degradation caused by processing the I/O requests issued by offloaded threads. Because most mobile applications are interactive and thus yield frequent I/O requests, efficient handling of I/O operations is critically important. In this paper, we quantitatively analyze the performance degradation caused by I/O processing in DSM-based computation offloading schemes using representative commodity applications. To remedy the performance degradation, we apply a remote I/O scheme based on remote device support to computation offloading. The proposed approach improves the execution time by up to 43.6% and saves up to 17.7% of energy consumption in comparison with the existing offloading schemes. Selective compression of the remote I/O scheme reduces the network traffic by up to 53.5%. 展开更多
关键词 computation offloading mobile-cloud computing distributed shared memory (DSM) mobile computing
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NONH:A New Cache-Based Coherence Protocol for Linked List Structure DSM System and Its Performance Evaluation
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作者 房至一 鞠九滨 《Journal of Computer Science & Technology》 SCIE EI CSCD 1996年第4期405-415,共11页
The management of memory coherence is an important problem in distributed shared memory (DSM) system. In a cache-based coherence DSM system using linked list structure, the key to maintaining the coherence and improvi... The management of memory coherence is an important problem in distributed shared memory (DSM) system. In a cache-based coherence DSM system using linked list structure, the key to maintaining the coherence and improving system performance is how to manage the owner in the linked list. This paper presents the design of a new management protocol-NONH (New-OwnerNew-Head) and its performance evaluation. The analysis results show that thisprotocol can improve the scalability and performence of a coherent DSM system using linked list. It is also suitable for managing the cache coherency in tree-like hierarchical architecture. 展开更多
关键词 Linked list cache coherence distributed shared memory
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