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Rain scenes rendering algorithm combining metaball with mass-spring surface

Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2013年第SUPPL.1期43卷 230-234页

作者： Lyu, Meng-Ya Zheng, Xuan Tang, Yong College of Information Science and Engineering Yanshan University Qinhuangdao 066004 China The Key Laboratory for Computer Virtual Technology and System Integration of HeBei Province Qinhuangdao 066004 China

To solve the problems such as unreal effects, incomplete details in the rain scene, an algorithm to simulate water surface after rain hitting by combining Meatball with mass-spring water surface was presented. First, the raindrops model was estabished with particle system combining textures, and the water surface model was established with the mass-spring model. Secondly, the algorithm animated half globular bubbles after rain hitting with Meatball. Thirdly, water splash was simulated by means of the particle system and a gradual thinning and syncretizing technique. Finally, with the help of Cg language, the reflection and the refraction effect on the water surface, globular bubbles and water splash were simulated. The experiment shows that this approach can be used to simulate rain scenes efficiently and realistically.

关键词： Rain

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A big data based data storage systems for rock burst experiment

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International Journal of Wireless and Mobile Computing 2013年第5期6卷 463-472页

作者： Zhang, Yu Bai, Yan-Ping Zhu, Dong-Feng Lv, Zhao-Yong Department of Computer Science Beijing University of Civil Engineering and Architecture Beijing China State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and Technology Beijing China School of Management Capital Normal University Beijing China School of Computer Science and Technology Beijing Institute of Technology Beijing China Department of Computer Teaching and Network Information Beijing University of Civil Engineering and Architecture Beijing China

State key laboratory for GeoMechanics and Deep Underground Engineering, Deep-Lab for short, has been committed to the study of rock burst. Deep-Lab accumulated a large number of rock-burst data. With the deepening of the research progress, massive-data dilemma, artificial-management-data dilemma and experimental-data-analysis dilemma have become three big problems of rock burst. These dilemmas restrict the development of rock burst research technologies. This article takes big data in rock burst experiment as research objects and innovatively introduces big data technology into rock burst. Digital features of rock-burst experimental data were extracted. On this basis, a big data based data storage systems for rock burst experiment, BDSS for short, was designed and built. Then an integrated rock burst experimental platform was constructed. Experiments show that, BDSS solves three dilemmas of rock burst, and realises the distributed storage system of data. BDSS also realises dynamic and efficient load of rock-burst big data, and its efficient query under complication conditions. Copyright © 2013 Inderscience Enterprises Ltd.

关键词： Big data

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Design and implementation of the network electronic identity management system

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2nd International Conference on Opto-Electronics Engineering and Materials Research, OEMR 2013

作者： Zou, Xiang Chen, Bing The 3rd research institute of ministry of public security Key laboratory of information network security Ministry of Public Security Shanghai China Dept. of computer engineering Tongji University Shanghai China

ISBN: (纸本)9783037857731

With the prompt evolution of Internet, network identity management is getting more and more basilica. Personal network electronic identity associated in reality has been the significant and urgent task when online life becomes real. So this paper designs the network electronic identity management system architecture, and discusses the key technology of the system implementation including electronic identity generation and verification of electronic identity, and electronic identity state transition. The network electronic identity management system also has been primary implemented and achieved good effects in actual applications. © (2013) Trans Tech Publications, Switzerland.

关键词： Authentication

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Accountable authority identity-based encryption with public traceability 1

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Cryptographers' Track at the RSA Conference 2013, CT-RSA 2013

作者： Lai, Junzuo Deng, Robert H. Zhao, Yunlei Weng, Jian School of Information Systems Singapore Management University Singapore Singapore Software School Fudan University China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences China Department of Computer Science Emergency Technology Research Center of Risk Evaluation and Prewarning on Public Network Security Jinan University China Shanghai Key Laboratory of Integrate Administration Technologies for Information Security China

ISBN: (数字)9783642360954

ISBN: (纸本)9783642360947

At Crypto'07, Goyal introduced the notion of accountable authority identity-based encryption (A-IBE) in order to mitigate the inherent key escrow problem in identity-based encryption, and proposed two concrete constructions. In an A-IBE system, if the private key generator (PKG) distributes a decryption key or produces an unauthorized decryption box for a user maliciously, it runs the risk of being caught and sued in the court of law with the help of a tracing algorithm. Subsequent efforts focused on constructions of A-IBE schemes with enhanced security. In these A-IBE constructions, the tracing algorithm needs to take a user's decryption key as input. If the user lost his key or is deliberately uncooperative in court, then we cannot implicate the PKG or the user. An interesting open problem left by Goyal et al. at CCS'08 is to consider the possibility of tracing a decryption box using only a public tracing key, or with the assistance of a tracing authority. In this paper, we address this problem positively. We first extend the original model of A-IBE to accommodate public traceability, and then propose an A-IBE scheme in the new model. To the best of our knowledge, the proposed scheme is the first A-IBE with public traceability. © 2013 Springer-Verlag.

关键词： Accountable Authority Identity Based Encryption Public Traceability

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On the spatial-Temporal Reachability of DTNs

On the spatial-Temporal Reachability of DTNs

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2nd CCF Internet Conference of China, ICoC 2013

作者： Zhang, Cheng Xia, Chunhe Wang, Haiquan Li, Xiaojian Beijing Key Laboratory of Network Technology Beihang University Beijing China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China College of Software Beihang University Beijing China College of Computer Science and Information Technology Guangxi Normal University Guilin China

ISBN: (纸本)9783642539589

As traditional "Connectivity" concept from the Internet ignores the possibility of opportunistic contacts in DTNs, this paper brings time dimension into consideration, proposes Spatial-Temporal Path, Spatial-Temporal Reachability and K-Reachability in order to better describe the whole communication process and "Eventual Transportability" of DTN. Analytical and simulation results are given to show the correctness of our approach. Furthermore, Spatial-Temporal Reachability and K-Reachability, which tell a network's robustness in a quantitative fashion, are proved to be suitable for analyzing efficiency and routing performance of DTNs. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Connectivity DTN Spatial-Temporal Reachability

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A computer network defense policy refinement method

A computer network defense policy refinement method

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2nd CCF Internet Conference of China, ICoC 2013

作者： Wei, Zhao Lv, Yanli Xia, Chunhe Luo, Yang Wei, Qing Key Laboratory of Beijing Network Technology School of Computer Science and Engineering Beihang University Beijing China Information Center of Ministry of Science and Technology The Ministry of Science Technology of the People's Republic of China Beijing China

ISBN: (纸本)9783642539589

The existing methods of policy refinement in computer network defense (CND) can only support the refinement of access control policy, but not the policies of protection, detection, response, and recovery. To solve this problem, we constructed a computer network defense policy refinement model and its formalism specification. An algorithm of defense policy refinement is designed. At last, the effectiveness of our methods was verified through one experiment cases of the composition policies with intrusion detection, vulnerabilities detection, and access control. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Specifications

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ENERGY EFFICIENT DISTRIBUTED STEGANOGRAPHY FOR SECURE COMMUNICATION IN WIRELESS MULTIMEDIA SENSOR networkS

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Journal of Electronics(China) 2013年第1期30卷 9-16页

作者： Lin Qiaomin Wang Ruchuan Ye Ning Wang Zhongqin College of Computer Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education Department of Information Science Nanjing College for Population Management

A secure communication mechanism is necessary in the applications of Wireless Multimedia Sensor networks (WMSNs), which is more vulnerable to security attacks due to the presence of multimedia data. Additionally, given the limited technological resources (in term of energy, computation, bandwidth, and storage) of sensor nodes, security and privacy policies have to be combined with energy-aware algorithms and distributed processing of multimedia contents in WMSNs. To solve these problems in this paper, an energy efficient distributed steganography scheme, which combines steganography technique with the concept of distributed computing, is proposed for secure communication in WMSNs. The simulation results show that the proposed method can achieve considerable energy efficiency while assuring the communication security simultaneously.

关键词： Discrete Wavelet Transform （DWT） Distributed steganography Energy efficiency Perfect hash Wireless Multimedia Sensor networks （WMSNs）

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Tableaux Algorithms for Expressive Possibilistic Description Logics

Tableaux Algorithms for Expressive Possibilistic Description...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Jinfan Zhu Guilin Qi Boontawee Suntisrivaraporn Ecole des mines d'Albi-Carmaux France Key Laboratory of Computer Network and Information Integration of State Education Ministry Southeast University China School of Information and Communication Technology Griffith University Australia

Possibilistic Description Logics (DLs) extend description logics with possibilistic semantics to reason with inconsistent and uncertain knowledge. In possibilistic DLs, a crucial reasoning task is to compute the inconsistency degree of a possibilistic DL knowledge base. In this work, we first point out a shortcoming of a previous tableaux algorithm for possibilistic DL ALC and propose a new tableaux algorithm. We then propose a tableaux algorithm for computing the inconsistency degree of a knowledge base in possibilistic DL ALCI(R + ), which extends possibilistic DL ALC with inverse roles and transitive roles. A blocking condition is proposed to ensure the termination of the algorithm. Although the tableaux algorithm for possibilistic DL ALCI(R + ) is easy to understand and to implement, it may need exponential space in the worst case. Therefore, we give another tableaux algorithm to improve it and show that the complexity of this algorithm is PSpace-complete. This shows that the flexibility in representing uncertain information is handled without extra computational costs.

关键词： Knowledge based systems Ontologies Educational institutions Semantics Cognition Uncertainty Electronic mail

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Performance analysis of optimal relay selective cooperation in railway network

Performance analysis of optimal relay selective cooperation ...

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5th IET International Conference on Wireless, Mobile and Multimedia networks, ICWMMN 2013

作者： You, Jia Zhong, Zhangdui Yang, Shan Liu, Yang Wang, Gongpu State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China School of Computer and Information Technology Beijing Jiaotong University Beijing China Network Technology Research Institute China United Network Communications Co. Ltd. China

ISBN: (纸本)9781849197267

In the railway network, the fact that signal amplitude suffers loss resulted from signal traversing through the carriage which named by carriage pass loss, highly influences the reliability of the wireless communication system. In this paper, we propose an optimal relay selective cooperation (ORSC) scheme without the acknowledgment from the destination as if it succeeds in decoding or not. The main purpose of this paper is to evaluate the performance of ORSC transmission schemes. Specifically, the closed-form outage probabilities for ORSC transmission scheme are derived. By comparing obtained outage probability of ORSC with the non-cooperation transmission scheme, we find the ORSC transmission has better performance, better reliability and significantly eliminates the impact of the carriage passing loss.

关键词： Reliability analysis

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Frequent itemset mining over stream data: Overview

Frequent itemset mining over stream data: Overview

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IET International Conference on information and Communications Technologies, IETICT 2013

作者： Qu, Z.G. Niu, X.X. Deng, J. McArdle, C. Wang, X.J. Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China School of Electronic Engineering Dublin City University Dublin Ireland Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781849196536

During the past decade, stream data mining has been attracting widespread attentions of the experts and the researchers all over the world and a large number of interesting research results have been achieved. Among them, frequent itemset mining is one of main research branches of stream data mining with a fundamental and significant position. In order to further advance and develop the research of frequent itemset mining, this paper summarizes its main challenges and corresponding algorithm features. Based on them, current related results are divided into two categories: data-based algorithms and task-based algorithms. According to its taxonomy, the related methods belonging to the different categories and sub-categories are comprehensively introduced for better understanding. Finally, a brief conclusion is given.

关键词： Data mining

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