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Optimization for reliable erasure-coded storage allocation under multiple constraints

Optimization for reliable erasure-coded storage allocation u...

引用

IEEE International Conference on Performance, computing and Communications (IPCCC)

作者： Guangping Xu Xing Guo Hua Zhang Sheng Lin Chunxia Yang Computer and Communication Engineering School Tianjin University of Technology Tianjin China Tianjin Key Lab. of Intelligence Computing and New Software Technology Tianjin China

ISBN: (纸本)9781479932153

To maximize the reliability of erasure coded objects in cloud storage, the optimal allocation is a challenging problem constrained with the node heterogeneities and erasure coding budgets. We model the optimal problem from a combinatorial view under multiple constraints and propose an efficient search algorithm to find the most reliable allocation. The experiments are evaluated and analyzed including the optimal reliability, redundancy reduction and allocation pattern.

关键词： Peer-to-peer computing Resource management Encoding Redundancy Availab.lity Bandwidth

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Spelling out opinions: Difficult cases of sentiment analysis

Spelling out opinions: Difficult cases of sentiment analysis

引用

IEEE International Conference on Ubi-Media computing

作者： Ivan Khozyainov Evgeny Pyshkin Vitaly Klyuev Institute of Computing and Control St. Petersburg State Polytechnical University St. Petersburg Russia Software Engineering Lab. University of Aizu Fukushima Japan

In recent years there is growing interest to the opinion mining applications in numerous areas of information and social science. In this paper we investigate main problems in opinion mining and sentiment analysis systems development. We review examples of difficulties in process of opinion extraction and introduce essential multidimensionality of opinion mining. We carried out a series of experiments with different sentiment analyzers and classified main reasons of incorrect sentiment recognition.

关键词： Data mining Context Motion pictures Monitoring Media Grammar Text recognition

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CLSIFT: An Optimization Study of the Scale Invariance Feature Transform on GPUs

CLSIFT: An Optimization Study of the Scale Invariance Featur...

引用

IEEE International Conference on High Performance computing and Communications (HPCC)

作者： Weiyan Wang Yunquan Zhang Long Guoping Shengen Yan Haipeng Jia School of Computer and Control Engineering University of Chinese Academy of Sciences Beijing China State Key Laboratory of Computing Science Institute of Software Chinese Academy of Sciences Lab. of Parallel Software and Computational Science Institute of Software Chinese Academy of Sciences

Scale Invariance Feature Transform (SIFT) is quite suitable for image matching because of its invariance to image scaling, rotation and slight changes in illumination or viewpoint. However, due to high computation complexity it's technically challenging to deploy SIFT in real time application situations. To address this problem, we propose CLSIFT, an OpenCL based highly speeded up and performance portable SIFT solution. Important optimization techniques employed in CLSIFT such as: (1) For less global memory traffic, independent logical functions are merged into the same kernel to reuse data. (2) loop buffers are introduced in for data and intermediate results reusing. (3)Task queue used to schedule threads in the same branch to remove branch divergences. (4) Data partition is based on the statics patterns for workload balance among workgroups. (5) Overlap of CPU time and better parallel strategies are used too. With all mentioned efforts, CLSIFT processes lena. jpg at 74.2 FPS and 43.4FPS respectively on NVidia and AMD GPUS, much higher than CPU's nearly 10 FPS and the known fastest SIFTGPU's 39.8 FPS and 13FPS. Moreover in a quantitative comparison approach we analyze those successful strategies beating SIFTGPU, a famous existing GPU implementation. Additionally, we observe and conclude that NVidia GPU achieves better occupancy and performance due to some factors. Finally, we summarize some techniques and empirical guiding principles that may be shared by other applications on GPU.

关键词： Graphics processing units Instruction sets Kernel Accuracy Histograms Optimization Memory management

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3D model estimation using a single RGB-D image

3D model estimation using a single RGB-D image

引用

2012 International Conference on Machine Learning and Cybernetics, ICMLC 2012

作者： Li, Ricky Jun-Bo Luo, Rong-Hua Min, Hua-Qing Intelligent Software and Robot Lab. School of Computer Science and Engineering South China University of Technology Guangzhou China

ISBN: (纸本)9781467314855

Model estimation is important for robotic grasping. Since in order to make a decision about how to grasp the object, the robot should know where the target is and what it looks like. In this paper we propose a method of 3D model estimation using a single RGB-D image. The target object is segmented out from background using RANSAC and convex hull algorithm. And a clustering method is designed to separate different objects. After recognizing the types of the objects, the parameters of the model of objects are estimated according partial observed information and the symmetrical property of objects. Although the parameter estimation process may vary for different kinds of model, yet the key of the method are RANSAC and Ordinary Least Squares (OLS). Experimental results show that our method is effective in model analyzing. © 2012 IEEE.

关键词： Parameter estimation

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Action reconginiton using human pose

Action reconginiton using human pose

引用

2012 International Conference on Machine Learning and Cybernetics, ICMLC 2012

作者： Chen, Cong Min, Hua-Qing Luo, Rong-Hua Intelligent Software and Robot Lab. School of Computer Science and Engineering South China University of Technology Guangzhou China

ISBN: (纸本)9781467314855

In this paper, we present a novel method for recognizing human actions in videos. The method applies the human pose based features to describe actions and models the conditional probability relationship between feature sequences and actions using hidden conditional random field (HCRF). Given a video, limb masks are extracted by clustering image features in human region. Limb masks are helpful to reduce the interference from background and partially address the "double-counting" problem during the pose estimation. Then, the extracted pose sequence is smoothed using the kalman smooth to remove the noise and make the pose sequence consistent. Multiple kinds of feature sequences based on poses are extracted to describe the information of actions from different views. We train one HCRF for each feature sequence and combine the confidence from different HCRFs to improve the recognition accuracy. Experiments on the benchmark dataset show different features have their own advantages in action recognition and combine them can reach a good result. © 2012 IEEE.

关键词： Image recognition

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Expander Code: A Scalab.e Erasure-Resilient Code to Keep up with Data Growth in Distributed Storage

Expander Code: A Scalable Erasure-Resilient Code to Keep up ...

引用

IEEE International Performance computing and Communication Conference

作者： Guangping Xu Sheng Lin Hua Zhang Xing Guo Kai Shit Computer and Communication Engineering School Tianjin University of Technology Tianjin China 300384 Tianjin Key Lab. of Intelligence Computing and New Software Technology Tianjin China 300384

ISBN: (纸本)9781479932153

To ensure high reliability and storage efficiency, erasure codes are preferred in storage systems. With the prevalent of distributed storage systems such as clouds storage, how to design a scalab.e and efficient erasure-resilient code is challenging. We propose a scalab.e binary linear code to keep up with data growth which has the following properties. Given the group size k and the code block length n, the proposed code corrects any two bit erasures among the n bits. The redundancy overhead of the code is 2/(k + 2), and each data bit affects exactly 2 parity bits. As results of these properties, if a data bit is changed or added, only two parity bits need to be updated;and the recovery of an erasured bit requires accessing at most k other bits and the recovery of two erasured bits requires at most 2k other bits. We give the construction algorithm by the order expansion of regular graphs;moreover, we optimize the failure resilience during the construction procedure. Compared with existing codes, our proposed code has notable benefits in storage scalab.lity, redundancy overhead and I/O bandwidth. The deployment of the proposed code in distributed storage systems can be simple and practical.

关键词： Storage systems Erasure codes Scalab.lity Fault-tolerance Graph expansion

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Behavior analysis of software systems based on Petri net slicing

Behavior analysis of software systems based on Petri net sli...

引用

8th International Conference on intelligent computing Technology, ICIC 2012

作者： Ma, Jiaying Han, Wei Ding, Zuohua Lab. of Intelligent Computing and Software Engineering Zhejiang Sci.-Tech. University Hangzhou Zhejiang 310018 China Institute of Logic and Cognition Sun Yat-sen University Guangzhou Guangdong 510275 China

ISBN: (纸本)9783642315879

This paper presents a new method to analyze system behavior. A software system is modeled by a Petri net, and then the Petri net is sliced into several parts based on T-invariant. It has been shown that the behavior of the slices is equivalent to the behavior of the original Petri net. Thus we can analyze the system behaviors by checking each slice. With this method, state space explosion problem in the static analysis can be solved to some extent. The Dining Philosophy problem has been used to demonstrate the benefit of our method. © 2012 Springer-Verlag.

关键词： Petri nets

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A composable mixed mode concurrency control semantics for transactional programs

A composable mixed mode concurrency control semantics for tr...

引用

14th International Conference on Formal engineering Methods, ICFEM 2012

作者： Barnett, Granville Qin, Shengchao School of Engineering and Computing Sciences Durham University United Kingdom School of Computing Teesside University United Kingdom State Key Lab. for Novel Software Technology Nanjing University China

ISBN: (纸本)9783642342806

Most software transactional memories employ optimistic concurrency control. A pessimistic semantics, however, is not without its benefits: its programming model is often much simpler to reason about and supports the execution of irreversible operations. We present a programming model that supports both optimistic and pessimistic concurrency control semantics. Our pessimistic transactions, guaranteed transactions (gatomics), afford a stronger semantics than that typically employed by pessimistic transactions by guaranteeing run once execution and safe encapsulation of the privatisation and publication idioms. We describe our mixed mode transactional programming language by giving a small step operational semantics. Using our semantics and their derived schedules of actions (reads and writes) we show that conflicting transactions (atomics) and gatomics are serialisable. We then go on to define schedules of actions in the form of Java's memory model (JMM) and show that the same properties that held under our restrictive memory model also hold under our modified JMM. © 2012 Springer-Verlag.

关键词： Semantics

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Service restructuring by choreography-driven equivalence

Service restructuring by choreography-driven equivalence

引用

2012 IEEE 9th International Conference on Services computing, SCC 2012

作者： Feng, Zaiwen Peng, Rong He, Keqing He, Zhou State Key Lab. of Software Engineering Wuhan University Wuhan Hubei Province China School of Computing Wuhan University Wuhan Hubei Province China

ISBN: (纸本)9780769547534

A Web service specification can be quite complex, including multiple operations and various kinds of message exchange patterns. In this work, we focus on the problem of restructuring a Web service, which contains a process model inside, preserving at the same time its behavior that is shown to the service user. We provide a behavioral signature model for service restructuring. It is considered for Web services to be choreography equivalence if they conform to the same behavioral signature model. Based on behavioral signature models and graph searching technologies, we provide an algorithm for restructuring the process model from within the service while assuring service choreography equivalence. A case study runs throughout the paper to illustrate the feasibility of our work. We have implemented a prototype to demonstrate and evaluate our approach. © 2012 IEEE.

关键词： Web services

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An embedded co-AdaBoost and its application in classification of software document relation

An embedded co-AdaBoost and its application in classificatio...

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2012 8th International Conference on Semantics, Knowledge and Grids, SKG 2012

作者： Liu, Jin Li, Juan Xie, Yuan Lei, Jeff Hu, Qiping State Key Lab. of Software Engineering Computer School Wuhan University China State Key Lab. of Intelligent Control and Management of Complex Systems Institute of Automation CAS China Department of Computer Science and Engineering University of Texas Arlington TX United States International School of Software Wuhan University China

ISBN: (纸本)9780769547947

To enhance classification performance by making use of easily availab.e unlab.lled data to overcome the scarcity of lab.lled data, this paper proposes an Embedded Co-Adaboost algorithm that integrates multi-view learning into the Adaboost learning framework and at the same time leverages the advantages of Co-training algorithm for performance enhancement. Experimental results demonstrate the effectiveness of the proposed algorithm in terms of the convergence rate, the accuracy, and the steady performance as compared to the original AdaBoost algorithm, without relying on redundant and sufficient feature sets. As a algorithm application in software engineering, the Embedded Co-AdaBoost has been applied to the classification of software document relations to improve the quality of the architecture design documents and the reusability of design knowledge. © 2012 IEEE.

关键词： Reusability

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