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Low-Overhead Non-Blocking Checkpointing Scheme for Mobile computing Systems

Tsinghua Science and technology 2007年第S1期12卷 110-115页

作者：门朝光曹刘娟王立闻徐振朋 R & D Center of High Dependability Computing Technology Harbin Engineering University

When applied to mobile computing systems,checkpoint protocols for distributed computing systems would face many new challenges, such as low wireless bandwidth, frequent disconnections, and lack of stable storage at mobile hosts. This paper proposes a novel checkpoint protocol to effectively reduce the coordinating overhead. By using a communication vector, only a few processes participate in the checkpointing event. during checkpointing, the scheme can save the time used to trace the dependency tree by sending checkpoint requests to dependent processes at once. In addition, processes are non- blocking in this scheme, since the inconsistency is resolved by the piggyback technique. Hence the unnecessary and orphan messages can be avoided. Compared with the traditional coordinated checkpoint approach, the proposed non-blocking algorithm obtains a minimal number of processes to take checkpoints. It also reduces the checkpoint latency, which brings less overhead to mobile host with limited resources.

关键词： mobile computing fault tolerant coordinated checkpoint rollback recovery

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Low-Overhead Non-Blocking Checkpointing Scheme for Mobile computing Systems

Low-Overhead Non-Blocking Checkpointing Scheme for Mobile Co...

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第十二届全国容错计算学术会议

作者： MEN Chaoguang CAO Liujuan WANG Liwen XU Zhenpeng R & D Center of High Dependability Computing Technology Harbin Engineering UniversityHarbin 150001 R & D Center of High Dependability Computing Technology Harbin Engineering UniversityHarbin 150001

When applied to mobile computing systems, checkpoint protocols for distributed computing systems would face many new challenges, such as low wireless bandwidth, frequent disconnections, and lack of stable storage at mobile hosts. This paper proposes a novel checkpoint protocol to effectively reduce the coordinating overhead. By using a communication vector, only a few processes participate in the checkpointing event. during checkpointing, the scheme can save the time used to trace the dependency tree by sending checkpoint requests to dependent processes at once. In addition, processes are non-blocking in this scheme, since the inconsistency is resolved by the piggyback technique. Hence the unnecessary and orphan messages can be avoided. Compared with the traditional coordinated checkpoint approach, the proposed non-blocking algorithm obtains a minimal number of processes to take checkpoints. It also reduces the checkpoint latency, which brings less overhead to mobile host with limited resources.

关键词： mobile computing fault tolerant coordinated checkpoint rollback recovery

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ddSF: A data deduplication system framework for cloud environments

DDSF: A data deduplication system framework for cloud enviro...

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4th International Conference on Cloud computing and Services Science, CLOSEr 2014

作者： Gu, Jianhua Zhang, Chuang Zhang, Wenwei High Performance Computing R and D Center School of Computer Science and Technology Northwestern Polytechnical University Xi'an China

ISBN: (纸本)9789897580192

Cloud storage has been widely used because it can provide seemingly unlimited storage space and flexible access way, while the rising cost of storage and communications is an issue. In this paper, we propose a data deduplication System Framework(ddSF) for cloud storage environments. The ddSF consists of three major components, the client, fingerprint server and storage component. The client component divides file into chunks and calculates hash value of each chunk. And it only sends the chunk whose hash value has not existed in fingerprint server component to the storage component, so it can reduce consumption of communications and storage space. We developed an Index File System(IFS) to manage the metadata of user file in fingerprint server. The fingerprint server component maintains a hash table containing the hash values of chunks already stored in storage component. This paper presents a two-level indexing mechanism to improve the both spatial and temporal overhead to access to the hash table. The first level employs the Bloom Filter and the second level uses hash table partition mechanism. In order to reduce the possibility of accidental collision of data block hash value, we use two hash algorithms to calculate the hash value of the chunk. We further conduct some experiments in our framework. The results of these experiments demonstrate that framework proposed in this paper can improve storage space utilization and reduce consumption of communications. Copyright © 2014 SCITEPrESS - Science and technology Publications.

关键词： Cloud storage

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discovering latent themes in aviation safety reports using text mining and network analytics

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International Journal of Transportation Science and technology 2024年第4期16卷 292-316页

作者： Yingying Xing Yutong Wu Shiwen Zhang Ling Wang Haoyuan Cui Bo Jia Hongwei Wang The Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai201804China Institute of Safety Operation Research Institute China Eastern Technology Application R&D CenterShanghai 201707China Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A*STAR)Singapore 138632Singapore

Aviation accidents,referring to unexpected and undesirable events involving aircraft,often cause great damage to property and human *** from historical accidents is pivotal for improving safety in ***,aviation accidents are typically documented and stored as unstructured or semi-structured free-text,rendering the ability to analyze such data a difficult *** study presents a novel framework that combines text mining and network analytics techniques to provide the ability to analyze aviation accident reports *** framework comprises a four-step modelling approach to:(1)the transformation of unstructured aviation safety report texts into structured numeric matrices using the TF-IdF matrix;(2)the identification of aviation accident topics using a structural topic model(STM);(3)the production of a word co-occurrence network(WCN)to determine the interrelations between aviation safety risk factors;and(4)quantitative analysis by technology of keywords to pinpoint key causal factors in aviation safety *** proposed framework is validated by analyzing aviation accident reports collected by the National Transportation Safety Board(NTSB).The results indicate that STM provides a more granular partitioning of topics and better distinguishes between similar events compared to traditional latent dirichlet allocation(LdA).Among the identified topics,“Fuel and Power”and“En-route Phase”have the highest occurrence rate according to ***,“Aircraft Crash”is the most prevalent topic in aviation accidents that resulted in fatal injuries,whereas the“Landing phase”is the most prevalent topic in nonfatal injuries on *** on the WCN,three centrality measures highlight“inspection of equipment”and“take off”as the most important risk factors in aviation *** proposed framework provides a comprehensive solution for in-depth analysis of aviation safety reports,offering decision support for aviation safety management and ac

关键词： Aviation safety Aviation accident report Text mining Topic modeling Network analysis

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Checkpointing simulation in mobile environment based on GloMoSim

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Harbin Gongye daxue Xuebao/Journal of Harbin Institute of technology 2009年第SUPPL. 1期41卷 63-67页

作者： Li, Xiang Men, Chao-Guang Zhang, Xin R and D Center of High-Dependability Computing Technology Harbin Engineering University Harbin 150001 China

Software checkpointing technology as an important fault tolerance scheme widely used in mobile computing system, has great significance for improving fault tolerance performance of mobile computing network. Based on the wireless network simulator GloMoSim, the simulation of checkpointing rollback protocol with mobile supporting station in mobile computing environment is designed in this paper. Through adding checkpointing protocol in the application layer of the GloMoSim, the simulation test of an existing time-based checkpointing and optimistic message logging algorithm are carried on. Simulation results show that the checkpointing algorithms can run well and meet the existing research results.

关键词： Mobile computing

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The design and Implementation of Patent Collaboration Managing Platform Based on Cloud Architecture

The Design and Implementation of Patent Collaboration Managi...

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2014 IEEE 5th International Conference on Software Engineering and Service Science

作者： Xiang Wang Yong Yang Xiaoguang Lin Yongyuan Chen Ju Zhang High Performance Computing Application R＆D Center Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences

The patent information data has the characteristics of massive,open,scattered,but the lack of a well-designed platform which can make good use of these data is still a *** platform introduced in this paper which is mainly tailored for patent agencies can organize resource information,provide analysis report,and promote business *** on cloud architecture,the platform has been designed and implemented to integrate the patent data from different systems,allocate resources dynamically through virtualization technology,and provide high-value services by depth data *** present,this platform is applied as a business cooperation platform in the project of patent-cloud in Chongqing.

关键词： cloud architecture business cooperation patent-cloud data analysis system integration

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Calculation of heavy meson light-cone distribution amplitudes from lattice QCd

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Physical review d 2025年第3期111卷 034503-034503页

作者： Xue-Ying Han Jun Hua Xiangdong Ji Cai-dian Lü Andreas Schäfer Yushan Su Wei Wang Ji Xu Yibo Yang Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Atomic and Subatomic Structure and Quantum Control (MOE) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Institute of Quantum Matter South China Normal University Guangzhou 510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear Science Southern Nuclear Science Computing Center South China Normal University Guangzhou 510006 China Department of Physics University of Maryland College Park Maryland 20742 USA Institut für Theoretische Physik University Regensburg D-93040 Regensburg Germany Shanghai Key Laboratory for Particle Physics and Cosmology Key Laboratory for Particle Astrophysics and Cosmology (MOE) School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Southern Center for Nuclear-Science Theory (SCNT) Institute of Modern Physics Chinese Academy of Sciences Huizhou 516000 Guangdong Province China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China School of Physics and Microelectronics Zhengzhou University Zhengzhou Henan 450001 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced Study UCAS Hangzhou 310024 China International Centre for Theoretical Physics Asia-Pacific Beijing/Hangzhou China

We develop an approach for calculating heavy quark effective theory (HQET) light-cone distribution amplitudes (LCdAs) by employing a sequential effective theory methodology. The theoretical foundation of the framework is established, elucidating how the quasidistribution amplitudes (quasi-dAs) with three scales can be utilized to compute HQET LCdAs. We provide theoretical support for this approach by demonstrating the rationale behind devising a hierarchical ordering for the three involved scales, discussing the factorization at each step, clarifying the underlying reason for obtaining HQET LCdAs in the final phase, and addressing potential theoretical challenges. The lattice QCd simulation aspect is explored in detail, and the computations of quasi-dAs are presented. We employ three fitting strategies to handle contributions from excited states and extract the bare matrix elements. For renormalization purposes, we apply hybrid renormalization schemes at short and long distance separations. To mitigate long-distance perturbations, we perform an extrapolation in λ=z·Pz and assess the stability against various parameters. After two-step matching, our results for HQET LCdAs are found in agreement with existing model parametrizations. The potential phenomenological implications of the results are discussed, shedding light on how these findings could impact our understanding of the strong interaction dynamics and physics beyond the standard model. It should be noted, however, that systematic uncertainties have not been accounted for yet.

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A new bio-inspired location search algorithm for peer to peer network based Internet telephony 06

A new bio-inspired location search algorithm for peer to pee...

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Bio-Inspired Models of Network, Information and computing Systems, BIONETICS

作者： Sachin Kulkarni Niloy Ganguly Geoffrey Canright Andreas deutsch Department of Computer Science and Engineering Indian Institute of Technology Kharagpur Kharagpur India R&D Telenor Oslo Norway Center for Information Services High Performance Computing Dresden Germany Center for Information Services and High Performance Computing (ZIH) TU-Dresden Dresden

ISBN: (纸本)9781424404636

In this paper, we propose a p2p network based location search algorithm which can be used to establish connections in Internet telephony. By using the location search algorithm, the caller can identify the peer it is calling. The algorithm is based upon the concept of gradient search and is applicable upon unstructured networks. It is inspired by a biological phenomenon called haptotaxis. The algorithm performs at par with dHT-based location search algorithms, however it is much more robust than such structured algorithms. We also present some initial analysis to explain the reason behind the superiority of the algorithm

关键词： Peer to peer computing Internet telephony Protocols Network address translation robustness Algorithm design and analysis Costs Computer science high performance computing Biology computing

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research on the multidimensional educational review strategy Based on MOOCs Integrated by the multidimensional learning theory

Research on the multidimensional educational review strategy...

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2015 World Congress on Engineering and Computer Science, WCECS 2015

作者： Ming, Li Ju, Zhang Jingzhong, Zhang Lian, Chen High Performance Computing Application R and D Center Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing China Automated Reasoning and Cognition Key Laboratory of Chongqing Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing China Laboratory for Automated Reasoning and Programming Chengdu Institute of Computer Applications Chinese Academy of Sciences Chengdu China

ISBN: (纸本)9789881925367

Through a detailed analysis of the theoretical basis for MOOCs in terms of educational learning theories, this paper attempts at finding the corresponding relationship between the theories and MOOCs, which not only theoretically explains the reasons why MOOCs exceed all the previous education models, but also empirically proves it with voluminous facts and data. The author conducts this research in the hope of enlightening the online education platform of other types. Besides, this paper provides the model framework and strategy to multidimensional educational review based on MOOCs. The model and strategy are applicable not only to MOOCs, the large-scale online education, but also to various online education platforms.

关键词： E-learning

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Efficient thermal dissipation in wafer-scale heterogeneous integration of single-crystalline𝛽β-Ga_(2)O_(3)thin film on SiC

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Fundamental research 2021年第6期1卷 691-696页

作者： Wenhui Xu Tiangui You Yibo Wang Zhenghao Shen Kang Liu Lianghui Zhang Huarui Sun ruijie Qian Zhenghua An Fengwen Mu Tadatomo Suga Genquan Han Xin Ou Yue Hao Xi Wang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi’an 710071China School of Science and Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China Department of Physics State Key Laboratory of Surface PhysicsInstitute of Nanoelectronic Devices and Quantum ComputingFudan UniversityShanghai 200433China High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Collaborative Research Center Meisei UniversityHinoJapan Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The semiconductor,β-Ga_(2)O_(3)is attractive for applications in high power electronic devices with low conduction loss due to its ultra-wide bandgap(∼4.9 eV)and large Baliga’s figure of ***,the thermal conductivity of𝛽β-Ga_(2)O_(3)is much lower than that of other wide/ultra-wide bandgap semiconductors,such as SiC and GaN,which results in the deterioration of𝛽β-Ga_(2)O_(3)-based device performance and reliability due to *** overcome this problem,a scalable thermal management strategy was proposed by heterogeneously integrating wafer-scale single-crystalline𝛽β-Ga_(2)O_(3)thin films on a highly thermally conductive SiC *** of the transferred𝛽β-Ga_(2)O_(3)thin film indicated a uniform thickness to within±2.01%,a smooth surface with a roughness of 0.2 nm,and good crystalline quality with an X-ray rocking curves(XrC)full width at half maximum of 80 *** thermoreflectance measurements were employed to investigate the thermal *** thermal performance of the fabricated𝛽β-Ga_(2)O_(3)/SiC heterostructure was effectively improved in comparison with that of the𝛽β-Ga_(2)O_(3)bulk wafer,and the effective thermal boundary resistance could be further reduced to 7.5 m 2 K/GW by a post-annealing *** barrier diodes(SBds)were fabricated on both a𝛽β-Ga_(2)O_(3)/SiC heterostructured material and a𝛽β-Ga_(2)O_(3)bulk *** thermal imaging revealed the temperature increase of the SBds on𝛽β-Ga_(2)O_(3)/SiC to be one quarter that on the𝛽β-Ga_(2)O_(3)bulk wafer with the same applied power,which suggests that the combination of the𝛽-Ga_(2)O_(3)thin film and SiC substrate with high thermal conductivity promotes heat dissipation in𝛽β-Ga_(2)O_(3)-based devices.

关键词： Thermal management Heterogeneous integration Wafer scale𝛽β-Ga_(2)O_(3)on SiC Ion-cutting technique Schottky barrier diodes(SBds) Transient thermoreflectance(TTr) measurements

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