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Topic correlation analysis for cross-domain text classification

Topic correlation analysis for cross-domain text classificat...

26th AAAI Conference on Artificial Intelligence and the 24th Innovative Applications of Artificial Intelligence Conference, AAAI-12 / IAAI-12

作者： Li, Anghao Jin, Xiaoming Long, Mingsheng Key Laboratory for Information System Security School of Software Tsinghua University Beijing China Department of Computer Science and Technology Tsinghua University Beijing China

ISBN: (纸本)9781577355687

Cross-domain text classification aims to automatically train a precise text classifier for a target domain by using labeled text data from a related source domain. To this end, the distribution gap between different domains has to be reduced. In previous works, a certain number of shared latent features (e.g., latent topics, principal components, etc.) are extracted to represent documents from different domains, and thus reduce the distribution gap. However, only relying the shared latent features as the domain bridge may limit the amount of knowledge transferred. This limitation is more serious when the distribution gap is so large that only a small number of latent features can be shared between domains. In this paper, we propose a novel approach named Topic Correlation Analysis (TCA), which extracts both the shared and the domain-specific latent features to facilitate effective knowledge transfer. In TCA, all word features are first grouped into the shared and the domain-specific topics using a joint mixture model. Then the correlations between the two kinds of topics are inferred and used to induce a mapping between the domain-specific topics from different domains. Finally, both the shared and the mapped domain-specific topics are utilized to span a new shared feature space where the supervised knowledge can be effectively transferred. The experimental results on two real-world data sets justify the superiority of the proposed method over the stat-of-the-art baselines. Copyright © 2012, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Classification (of information)

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Security Analysis of an Electronic Commerce Protocol Using Casper/FDR2

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Wuhan University Journal of Natural sciences 2012年第6期17卷 499-503页

作者： CHANG Yinlong HU Huaping Department of Mathematics and Computer Science/Key Laboratory of Information Security of Network System Fuzhou UniversityFuzhou 350108FujianChina School of Computer Science National University of Defense TechnologyChangsha 410073HunanChina

Researchers have proposed several security protocols to protect the electronic commerce security in these years;however,not all of them are secure *** article extends model checking method with Casper/FDR2 to model and analyze a new electronic *** are found in the protocol and their mechanisms are discussed.A variety of solutions are given to different security *** improved protocol is proven to be robust and secure.

关键词： Casper FDR2 electronic commerce model checking formal analysis

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Processing time analysis of cloud services with retrying fault-tolerance technique

Processing time analysis of cloud services with retrying fau...

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2012 1st IEEE International Conference on Communications in China, ICCC 2012

作者： Wang, Chaonan Xing, Liudong Wang, Honggang Zhang, Zhaoyang Dai, Yuanshun Electrical and Computer Engineering Department University of Massachusetts Dartmouth MA 02747 United States Collaborative Autonomic Computing Laboratory School of Computer Science University of Electronic Science and Technology of China Chengdu 610054 China

ISBN: (纸本)9781467328159

This paper studies the processing time of cloud services using the retrying technique for fault tolerance. Specifically, the processing time of a cloud service is modeled and the probability distribution of the processing time is derived considering the effect imposed by retrying tasks in the case of service failures happening. As another important performance metric that can better reflect the Quality of Service (QoS) requirements of customers, the percentile of processing time is also studied. The percentile of processing time characterizes a threshold processing time so that a certain percentage of requests can be served in under the threshold value. Relationship between the task failure rate and percentile of processing time is studied through a numerical example. In addition, the percentile of processing time of cloud computing systems using the retrying technique is compared with that of systems using the check-pointing technique. © 2012 IEEE.

关键词： Cloud computing

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Probabilistic Critical Path Identification for Cost-Effective Monitoring of Service-Based systems

Probabilistic Critical Path Identification for Cost-Effectiv...

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IEEE International Conference on services computing (SCC)

作者： Qiang He Jun Han Yun Yang Jean-Guy Schneider Hai Jin Steve Versteeg Faculty of Information and Communication Technologies Swinburne University of Technology Melbourne Australia Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China CA Laboratories Melbourne Australia

When operating in volatile environments, service-based systems (SBSs) that are built through dynamic composition of component services must be monitored in order to guarantee the response times of the SBSs. In particular, the critical path of a composite SBS, i.e., the execution path in the service composition with the maximum execution time, should be prioritised in cost-effective monitoring as it determines the response time of the SBS. In volatile operating environments, the critical path of a SBS is probabilistic. As such, it is important to estimate the criticalities of the execution paths and the component services, i.e., the probabilities that they are critical, to decide which parts of the system to monitor. In this paper, we propose a novel approach to the identification of Probabilistic Critical Path for Service-based systems (PCP-SBS). PCP-SBS takes into account the probabilistic nature of the critical path and calculates path criticalities in the context of service composition. We evaluate PCP-SBS experimentally using SBSs that are synthetically composed based on a real-world Web service dataset.

关键词： Monitoring Scattering Time factors Timing Probability Probabilistic logic Runtime

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Towards the traffic hole problem in VANETs

Towards the traffic hole problem in VANETs

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9th ACM International Workshop on VehiculAr Inter-NETworking, systems, and Applications, VANET'12

作者： Song, Chao Liu, Ming Wen, Yonggang Chen, Guihai Cao, Jiannong School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu China School of Computer Engineering Nanyang Technological University Singapore Singapore School of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China Internet and Mobile Computing Laboratory Department of Computing Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)9781450313179

The data delivery in Vehicular Ad-hoc Networks which is based on the infrastructure-less vehicle-to-vehicle (V2V) communications, is sensitive to the traffic flows along the roads. However, the traffic flow may be interrupted by the traffic control system, and a gap appears to block the data delivery along the traffic flow. We term it as a traffic hole problem, which will drastically affect the data delivery along each road. For mitigating the problem, we investigate the signal operations at the intersections to adjust the traffic flows moving into the roads. © 2012 Authors.

关键词： Vehicular ad hoc networks

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A cloud-based watermarking method for health data security

A cloud-based watermarking method for health data security

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2012 10th Annual International Conference on High Performance computing and Simulation, HPCS 2012

作者： Yu, Zhiwei Thomborson, Clark Wang, Chaokun Wang, Jianmin Li, Rui Department of Computer Science and Technology Tsinghua University Beijing China Department of Computer Science University of Auckland New Zealand School of Software Tsinghua University Key Laboratory for Information System Security Beijing China

ISBN: (纸本)9781467323598

Private health information once confined to local medical institutions is migrating onto the Internet as an Electronic Health Record (EHR) that is accessed by cloud computing. No matter where it is hosted, health data is subject to security breaches, privacy abuses, and access control violations. However, novel technologies have new vulnerabilities, and allow new mitigations. In this paper, we propose a watermarking method in the architecture of cloud computing, to mitigate the risks of insider disclosures. Our design and preliminary implementation are accomplished by exploiting the MapReduce mechanism in the cloudlet we built. Our evaluation shows that our proposal addresses all of the requirements of the Cloud Oriented Architecture (COA) framework of the Jericho Forum. © 2012 IEEE.

关键词： Cloud computing

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The relation on prefix hijacking and the internet hierarchy

The relation on prefix hijacking and the internet hierarchy

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6th International Conference on Innovative Mobile and Internet services in Ubiquitous computing, IMIS 2012

作者： Zhao, Jinjing Wen, Yan Li, Xiang Peng, Wei Zhao, Feng Beijing Institute of System Engineering Beijing China National Key Laboratory of Science and Technology on Information System Security Beijing China Beijing Aerospace Control Center Beijing China National University of Defense Technology Computer School Changsha China

ISBN: (纸本)9780769546841

Border Gateway Protocol (BGP) is the de facto inter-domain routing protocol. There have been many incidents of IP prefix hijacking by BGP protocol in the Internet. Attacks may hijack victim's address space to disrupt network services or perpetrate malicious activities such as spamming and DoS attacks without disclosing identity. The relation on prefix hijacking and the Internet hierarchy is presented in this paper. The Internet is classified into three hierarchies based on the power-law and commercial relations of autonomous systems. The relation of network topology and prefix hijacking influence is presented for all sorts of hijacking events in different layers. The result shows that the hierarchical nature of network influences the prefix hijacking greatly. © 2012 IEEE.

关键词： Border Gateway Protocol

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Propagation-based social-aware replication for social video contents

Propagation-based social-aware replication for social video ...

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20th ACM International Conference on Multimedia, MM 2012

作者： Wang, Zhi Sun, Lifeng Chen, Xiangwen Zhu, Wenwu Liu, Jiangchuan Chen, Minghua Yang, Shiqiang Tsinghua National Laboratory for Information Science and Technology Department of Computer Science and Technology Tsinghua University Beijing China Department of Information Engineering Chinese University of Hong Kong Hong Kong School of Computing Science Simon Fraser University Vancouver BC Canada

ISBN: (纸本)9781450310895

Online social network has reshaped the way how video contents are generated, distributed and consumed on today's Internet. Given the massive number of videos generated and shared in online social networks, it has been popular for users to directly access video contents in their preferred social network services. It is intriguing to study the service provision of social video contents for global users with satisfactory quality-of-experience. In this paper, we conduct large-scale measurement of a real-world online social network system to study the propagation of the social video contents. We have summarized important characteristics from the video propagation patterns, including social locality, geographical locality and temporal locality. Motivated by the measurement insights, we propose a propagation-based social-aware replication framework using a hybrid edge-cloud and peer-assisted architecture, namely PSAR, to serve the social video contents. Our replication strategies in PSAR are based on the design of three propagation-based replication indices, including a geographic influence index and a content propagation index to guide how the edge-cloud servers backup the videos, and a social influence index to guide how peers cache the videos for their friends. By incorporating these replication indices into our system design, PSAR has significantly improved the replication performance and the video service quality. Our trace-driven experiments further demonstrate the effectiveness and superiority of PSAR, which improves the local download ratio in the edge-cloud replication by 30%, and the local cache hit ratio in the peer-assisted replication by 40%, against traditional approaches. © 2012 ACM.

关键词： Social networking (online)

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QoS-Driven Service Selection for Multi-tenant SaaS

QoS-Driven Service Selection for Multi-tenant SaaS

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IEEE International Conference on Cloud computing, CLOUD

作者： Qiang He Jun Han Yun Yang John Grundy Hai Jin Faulty of Information and Communication Technologies Swinburne University of Technology Melbourne Australia Services Computing Technology and Systems Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467328920

Cloud-based software applications (Software as a Service - SaaS) for multi-tenant provisioning have become a major development paradigm in Web engineering. Instead of serving a single end-user, a multi-tenant SaaS provides multiple end-users with the same functionality but with potentially different quality-of-service (QoS) values. The service selection for such a SaaS is a complex decision-making process which involves a number of stakeholders with different QoS requirements. SaaS developers need to compose services with different QoS values to meet end-users' different multidimensional QoS constraints for the SaaS. Furthermore, they also need to satisfy SaaS providers' optimisation goals for the SaaS, such as least resource cost and best system performance. Existing QoS-aware service selection approaches are oriented at a single tenant. They do not consider the characteristics of multi-tenant SaaS and hence are ineffective and inefficient when applied to compose multi-tenant SaaS. In this paper, we introduce a novel QoS-driven approach for helping SaaS developers select the services for composing multi-tenant SaaS, which achieves SaaS providers' optimisation goals while fulfilling the end-users' different levels of QoS constraints. The proposed approach is evaluated using an example SaaS synthetically generated based on a dataset of real-world Web services. Experimental results show that our approach significantly outperforms existing approaches in terms of both effectiveness and performance.

关键词： Quality of service Optimization Web services Business Time factors Greedy algorithms Linear programming

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Research on hardware security of embedded system in cloud environment

Research on hardware security of embedded system in cloud en...

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2012 2nd International Conference on Key Engineering Materials, ICKEM 2012

作者： Li, Jing Zhang, Huanguo Zhao, Bo Guo, Xi He, Fan School of Computer Wuhan University Wuhan 430072 Hubei China Key Laboratory of Aerospace Information Security and Trusted Computing of Ministry of Education Wuhan University Wuhan 430072 Hubei China School of Computer Science and Technology Wuhan University of Technology 1040 Heping Road Wuhan 430063 China

ISBN: (纸本)9783037853825

Cloud computing is an important innovation of current computing models. At present, the research on the security of cloud computing is mainly concentrated on PCs and servers. The security of embedded system in cloud environment does not win enough attention. This paper analysis the security threats of it, and proposes a Secure Hardware Model to provide a tamper-resistant and more reliable hardware embedded platform in cloud environment. Our model adds some new components to traditional embedded system, controls the start sequence of platform's components, verifies the integrity of crucial information for embedded platform and recovers the system if necessary. Our implementation demonstrates the feasibility of Secure Hardware Model, it enhance the secure and reliable boot of embedded system. With the constant development and application of embedded system in cloud computing field, our research will influence cloud computing greatly. © (2012) Trans Tech Publications.

关键词： Embedded systems

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