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30th International Conference on Software Engineering and Knowledge Engineering, SEKE 2018

作者： Li, Gaofeng Yuan, Pingpeng Jin, Hai Services Computing Technology and System Lab Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)1891706446

Nowadays, more and more large scale knowledge bases are available for public access. Although these knowledge bases have their inherent access interfaces, such as SPARQL, they are generally unfriendly to end users. An intuitive way to bridge the gap between users and knowledge bases is to enable users to ask questions with natural language interface and return desired answers directly. Here the challenge is how to discover the query intention of users. Another challenge is how to obtain accurate answers from knowledge bases. In this paper, we model the query intention with a graph based on an entity-driven method. Consequently, the core problem of natural language question answering can be treated as subgraph matching over knowledge bases. For a query graph, there is a huge number of candidate mappings in a knowledge base, including ambiguities. Thus, a semantic vector is proposed to address disambiguation by evaluating the semantic similarity between edges in a query graph and paths in a knowledge base. By this way, our system can extract accurate answers directly without any offline work. Extensive experiments over the series of QALD challenges show the effectiveness of our system Svega in terms of recall and precision against other state-of-The-Art systems. © 2018 Universitat zu Koln. All rights reserved.

关键词： Semantics

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Uniform information service interoperation framework among heterogeneous grids

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Journal of Networks 2011年第9期6卷 1359-1366页

作者： Tao, Yongcai Wu, Song School of Information Engineering Zhengzhou University Zhengzhou Henan 450001 China Services Computing Technology and System Lab Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan 430074 China China

Currently there is no practical standard for grid middleware, most of the grid platforms are built by their own, and it's not easy to interoperate these grid platforms. Information service is one of the key components of the service oriented grid system, and information service interoperation among heterogeneous grids is the first step towards grid interoperation. Existing grid interoperability projects mainly focus on immediate bridge mechanisms, which is intricate and of poor scalability. To address the issues, a uniform information service interoperation framework (UISIF) is proposed in the paper, which is based on the idea of mediated bridge mechanisms, and adopts virtual layer and plug-in technology. There are two wellestablished grid systems in China, Chinagrid and China National grid, and they are built with two different grid middleware, CGSP and VEGA. With UISIF, these two grid systems make information service interoperation a reality without changing the codes of current grid systems. The experiments also show that the information service interoperation has low information querying latency and high accuracy;Moreover, UISIF has good scalability based on hierarchical architecture, virtual layer and plug-in technology. © 2011 ACADEMY PUBLISHER.

关键词： Information services

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A hybrid memory architecture supporting fine-grained data migration

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Frontiers of Computer Science 2024年第2期18卷 31-41页

作者： Ye CHI Jianhui YUE Xiaofei LIAO Haikun LIU Hai JIN National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabCluster and Grid Computing LabSchool of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China Department of Computer Science Michigan Technological UniversityMichigan 49931USA

Hybrid memory systems composed of dynamic random access memory(DRAM)and Non-volatile memory(NVM)often exploit page migration technologies to fully take the advantages of different memory *** previous proposals usually migrate data at a granularity of 4 KB pages,and thus waste memory bandwidth and DRAM *** this paper,we propose Mocha,a non-hierarchical architecture that organizes DRAM and NVM in a flat address space physically,but manages them in a cache/memory *** the commercial NVM device-Intel Optane DC Persistent Memory Modules(DCPMM)actually access the physical media at a granularity of 256 bytes(an Optane block),we manage the DRAM cache at the 256-byte size to adapt to this feature of *** design not only enables fine-grained data migration and management for the DRAM cache,but also avoids write amplification for Intel Optane *** also create an Indirect Address Cache(IAC)in Hybrid Memory Controller(HMC)and propose a reverse address mapping table in the DRAM to speed up address translation and cache ***,we exploit a utility-based caching mechanism to filter cold blocks in the NVM,and further improve the efficiency of the DRAM *** implement Mocha in an architectural *** results show that Mocha can improve application performance by 8.2%on average(up to 24.6%),reduce 6.9%energy consumption and 25.9%data migration traffic on average,compared with a typical hybrid memory architecture-HSCC.

关键词： non-volatile memory hybrid memory system data migration fine-grained caching

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Finding and evaluating the community structure in semantic peer-to-peer overlay networks

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Science China(Information Sciences) 2011年第7期54卷 1340-1351页

作者： CHEN HanHua & JIN Hai services computing technology and System laboratory,cluster and grid computing laboratory,School of Computer Science and technology,Huazhong University of Science and technology,Wuhan 430074,China 1. Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

Recently much attention has been paid to semantic overlay networks for information retrieval in large scale peer-to-peer networks,and much research work on semantic overlay protocols and searching algorithms has been done and the results indicate that semantic overlay is efficient for content searching in peer-to-peer ***,very limited work has been done to analyze and evaluate the characteristics of semantic overlay *** this paper we identify a natural property of semantic overlay networks,the community *** propose a mathematical model to evaluate the property of community structure of semantic P2P overlay networks.A heuristic algorithm is designed to optimize the community *** the evaluation model we compare the SemreX semantic overlay with the Gnutella *** demonstrate that a SemreX overlay network has the distinctive community structure feature,while a Gnutella-like network does *** also simulate a simple flooding protocol in both overlays to show that the overlay with community structure is more efficient for content searching.

关键词： peer-to-peer community structure semantic overlay

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RB-GACA: An RBAC based grid access control architecture

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International Journal of grid and Utility computing 2005年第1期1卷 61-70页

作者： Jin, Hai Qiang, Weizhong Shi, Xuanhua Zou, Deqing Cluster and Grid Computing Lab. Huazhong University of Science and Technology Wuhan 430074 China

grid computing is emerging as a new format of wide area distributed computing. Because the distribution of services and resources in wide-area networks are heterogeneous, dynamic, and multi-domain, security is a critical concern in grid computing. Authorisation and access control, which are important aspects of security, have obtained more and more attention. This paper proposes a universal, scalable authorisation and access control architecture, RB-GACA, for grid computing. It is based on classical access control mechanism in distributed applications, Role Based Access Control (RBAC). The paper provides a flexible policy management approach for various grid environments. We also use a standard policy language for the presentation of access control policies to provide a general and standard support for different services and resources. Copyright © 2005, Inderscience Publishers.

关键词： Network architecture

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Chinagrid: Making grid computing a reality

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3334卷 13-24页

作者： Jin, Hai Cluster and Grid Computing Lab. Huazhong University of Science and Technology 430074 Wuhan China

grid computing presents a new trend to distributed computing and Internet applications, which can construct a virtual single image of heterogeneous resources, provide uniform application interface and integrate widespread computational resources into super, ubiquitous and transparent aggregation. Chinagrid project, founded by Ministry of Education of China, is an attempt to achieve above goals by exploring the various resources on existing and well developed internet infrastructure, CERNET (China Education and Research Network). In this paper, I will introduce the general picture of Chinagrid project, its vision and mission. The design of Chinagrid support platform, called CGSP, is also discussed briefly. To illustrate the reality of Chinagrid project, five different grid computing applications and its application supporting platform are discussed in detail. The purpose of this paper is to introduce this great grid project to the world completely for the first time. © Springer-Verlag Berlin Heidelberg 2004.

关键词： grid computing

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ReCSA:a dedicated sort accelerator using ReRAM-based content addressable memory

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Frontiers of Computer Science 2023年第2期17卷 1-13页

作者： Huize LI Hai JIN Long ZHENG Yu HUANG Xiaofei LIAO National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabClusters and Grid Computing LabSchool of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

With the increasing amount of data,there is an urgent need for efficient sorting algorithms to process large data *** sorting algorithms have attracted much attention because they can take advantage of different hardware's *** the traditional hardware sort accelerators suffer“memory wall”problems since their multiple rounds of data transmission between the memory and the *** this paper,we utilize the in-situ processing ability of the ReRAM crossbar to design a new ReCAM array that can process the matrix-vector multiplication operation and the vector-scalar comparison in the same array *** this designed ReCAM array,we present ReCSA,which is the first dedicated ReCAM-based sort *** hardware designs,we also develop algorithms to maximize memory utilization and minimize memory exchanges to improve sorting *** sorting algorithm in ReCSA can process various data types,such as integer,float,double,and *** also present experiments to evaluate the performance and energy efficiency against the state-of-the-art sort *** experimental results show that ReCSA has 90.92×,46.13×,27.38×,84.57×,and 3.36×speedups against CPU-,GPU-,FPGA-,NDP-,and PIM-based platforms when processing numeric data *** also has 24.82×,32.94×,and 18.22×performance improvement when processing string data sets compared with CPU-,GPU-,and FPGA-based platforms.

关键词： ReCAM parallel sorting architecture design processing-in-memory

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Reference metadata extraction from scientific papers

Reference metadata extraction from scientific papers

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2011 12th International Conference on Parallel and Distributed computing, Applications and Technologies, PDCAT 2011

作者： Guo, Zhixin Jin, Hai Cluster and Grid Computing Lab Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769545646

Bibliographical information of scientific papers is of great value since the Science Citation Index is introduced to measure research impact. Most scientific documents available on the web are unstructured or semi-structured, and the automatic reference metadata extraction process becomes an important task. This paper describes a framework for automatic reference metadata extraction from scientific papers. Our system can extract title, author, journal, volume, year, and page from scientific papers in PDF. We utilize a document metadata knowledge base to guide the reference metadata extraction process. The experiment results show that our system achieves a high accuracy. © 2011 IEEE.

关键词： Metadata

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VAIL: A victim-aware cache policy for improving lifetime of hybrid memory 9

VAIL: A victim-aware cache policy for improving lifetime of ...

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9th International Workshop on Programming Models and Applications for Multicores and Manycores, PMAM 2018

作者： Jia, Youchuang Zhou, Fang Gao, Xiang Wu, Song Jin, Hai Liao, Xiaofei Yuan, Pingpeng Services Computing Technology and System Lab Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781450356459

Nowadays emerging Non-Volatile Memory (NVM) technologies are introduced to remedy the shortages of the current DRAM-based memory system. However, NVM has limited write endurance, which would severely restrict the performance of memory system. In order to relieve above limitation, we proposed a victim-aware cache policy (VAIL), based on DRAM and NVM hybrid memory system. VAIL took the eviction locality of victims from the DRAM cache into consideration, to reduce writebacks to NVM and improve DRAM hit ratio at the same time. Our evaluation shows that VAIL could reduce 17.2% writebacks to NVM with single-core workloads, 22% writebacks to NVM with multi-core workloads and improve the DRAM hit ratio of the hybrid memory system. © 2018 Association for computing Machinery.

关键词： Dynamic random access storage

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Resource abstraction and data placement for distributed hybrid memory pool

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Frontiers of Computer Science 2021年第3期15卷 47-57页

作者： Tingting CHEN Haikun LIU Xiaofei LIAO Hai JIN National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab/Gluster and Grid Computing LabSchool of Gomputing Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Emerging byte-addressable non-volatile memory(NVM)technologies offer higher density and lower cost than DRAM,at the expense of lower performance and limited write *** have been many studies on hybrid NVM/DRAM memory management in a single physical ***,it is still an open problem on how to manage hybrid memories efficiently in a distributed *** paper proposes Alloy,a memory resource abstraction and data placement strategy for an RDMA-enabled distributed hybrid memory pool(DHMP).Alloy provides simple APIs for applications to utilize DRAM or NVM resource in the DHMP,without being aware of the hardware details of the *** propose a hotness-aware data placement scheme,which combines hot data migration,data replication and write merging together to improve application performance and reduce the cost of *** evaluate Alloy with several micro-benchmark workloads and public benchmark *** results show that Alloy can significantly reduce the DRAM usage in the DHMP by up to 95%,while reducing the total memory access time by up to 57%compared with the state-of-the-art approaches.

关键词： load balance distributed hybrid memory clouds

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