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2007 International Conference on Parallel Processing Workshops, ICPPW 2007

作者： Huang, Qi Jin, Hai Liao, Xiaofei Services Computing Technology and System Lab. Cluster and Grid Computing Lab. Huazhong University of Science and Technology

ISBN: (纸本)0769529348

P2P technology has been widely adopted in live streaming system for its scalability and low commercial cost. However, tree based system or mesh based system still has to face the constraint or tradeoff caused by its solo shaped overlay construction. To address this problem, this paper introduces a tree-mesh based hybrid overlay and an optimized scheduling method. These works have been proven efficient in terms of low control overhead and better streaming experience compared with other systems. All algorithms and methods have been implemented in Anysee2. © 2007 IEEE.

关键词： Peer to peer networks

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Svega: Answering natural language questions over knowledge base with semantic matching 30

Svega: Answering natural language questions over knowledge b...

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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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XGCN:a library for large-scale graph neural network recommendations

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Frontiers of Computer Science 2024年第3期18卷 247-249页

作者： Xiran SONG Hong HUANG Jianxun LIAN 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 Microsoft Research Asia Beijing 100080China

1 Introduction Graph Neural Networks(GNNs)have gained widespread adoption in recommendation systems,and nowadays there is a pressing need to effectively manage large-scale graph data[1].When it comes to large graphs,GNNs may encounter the scalability issue stemming from their multi-layer messagepassing ***,scaling GNNs has emerged as a crucial research area in recent years,with numerous scaling strategies being proposed.

关键词： scaling gained operations

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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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Container-Based Customization Approach for Mobile Environments on Clouds 13th

Container-Based Customization Approach for Mobile Environmen...

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13th International Conference on Green, Pervasive, and Cloud computing, GPC 2018

作者： Hu, Jiahuan Wu, Song Jin, Hai Chen, Hanhua Services Computing Technology and System Lab Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9783030150921

Recently, mobile cloud which utilizes the elastic resources of clouds to provide services for mobile applications, is becoming more and more popular. When building a mobile cloud platform (MCP), one of the most important things is to provide an execution environment for mobile applications, e.g., the Android mobile operating system (OS). Many efforts have been made to build Android environments on clouds, such as Android virtual machines (VMs) and Android containers. However, the need of customizable Android execution environments for MCP has been ignored for many years, since the existing OS customization solutions are only designed for hardware-specific platforms or driver-specific applications, and taking little account of frequently-changing scenarios on clouds. Moreover, they lack a unified method of customization, as well as an effective upgrade and maintenance mechanism. As a result, they are not suitable for varied and large-scale scenarios on clouds. Therefore, in this paper, we propose a unified and effective approach for customizing Android environments on clouds. The approach provides a container-based solution to custom-tailor Android OS components, as well as a way to run Android applications for different scenarios. Under the guidance of this approach, we develop an automatic customization toolkit named AndroidKit for generating specific Android OS components. Through this toolkit, we are able to boot new Android VM instances called AndroidXs. These AndroidXs are composed of OS images generated by AndroidKit, which can be easily customized and combined for varied demands on clouds. © 2019, Springer Nature Switzerland AG.

关键词： Android (operating system)

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grid workflow scheduling based on reliability cost 2

Grid workflow scheduling based on reliability cost

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2nd International Conference on Scalable Information systems, InfoScale 2007

作者： Tao, Yongcai Jin, Hai Shi, Xuanhua Cluster and Grid Computing Lab Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781595937575

grid workflow is a complex and typical grid application, but owing to the highly dynamic feature of grid environments, resource unavailability is increasingly becoming severe and poses great challenges to grid workflow scheduling. Though fault recovery mechanism adopted in grid system guarantee the completion of jobs to some extent, but wasting system resources. To overcome the shortcoming, this paper proposes a Markov Chain based grid node availability prediction model which can efficiently predict grid nodes' availability in the future without adding significant overhead. Based on this model, the paper presents a grid workflow scheduling based on reliability cost (RCGS). The performance evaluation results demonstrate that RCGS improves the dependability of workflow execution and success ratio of tasks with low reliability cost.

关键词： grid computing

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Dev store: Distributed storage system for desktop virtualization

Dev store: Distributed storage system for desktop virtualiza...

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8th International Conference on Computer Science and Education, ICCSE 2013

作者： Jiang, Yue Jin, Hai Liao, Xiaofei Services Computing Technology and System Lab Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781467344623

With the development of desktop virtualization technology, more and more companies begins to deploy virtual desktop. Traditional NAS and SAN storages can only support small-scale users due to network bandwidth limit and poor scalability. Another disadvantage is that NAS and SAN storages are very expensive. The distributed file systems such as GFS, PVFS, and Lustre are with low cost, high scalability and mass storage, but they are only designed for specific scenarios and can not meet the need of desktop virtualization storage. The characteristics of virtual desktop I/O are small random I/O, high IOPS, snapshot needed and frequent access of the root image. Based on these I/O characteristics, DevStore is designed for desktop virtualization, and aims to be low cost, good scalability and performance. Experiments show that DevStore image's write performance is 70MB/s and read performance is 60MB/s in gigabit Ethernet. The snapshot time of DevStore is less than 1ms. DevStore is also easy to expand. Experiments also show that DevStore is better than QCOW in NFS environment and meets the desktop virtualization storage need. © 2013 IEEE.

关键词： Virtual machine

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A Novel routing scheme for paired peers in P2P network

A Novel routing scheme for paired peers in P2P network

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2007 Asian technology Information Program's (ATIP's) 3rd Workshop on High Performance computing in China - Solution Approaches to Impediments for High Performance computing, CHINA HPC'07

作者： Liao, Xiaofei Services Computing Technology and System Lab Cluster and Grid Computing Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781595939036

Peer-to-Peer (P2P) networks have been shown to be a promising approach to provide instant voice services over the Internet for its potential high scalability. However, for one paired peers, how to efficiently transmit voice data among peers in such networks remains a major challenge. Hereby this paper proposed some hybrid routing schemes for P2P transmitting system, which include improved random detection algorithm, delay binary tree search algorithm, AS-aware discovery algorithm. With the help of these novel routing schemes, we can choose the correct algorithm to transfer media data, in small size but low delay, among peers in P2P network. Simulations show that these new routing strategies achieve obvious effect. © 2008 ACM.

关键词： Trees (mathematics)

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