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15th International Conference on Distributed Multimedia Systems, DMS 2008

作者： Yang, Chi-Lu Chang, Yeim-Kuan Chang, Ching-Pao Chu, Chih-Ping Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan Innovative DigiTech-Enabled Applications and Service Institute Institute for Information Industry Kaohsiung Taiwan Department of Information Engineering Kun Shan University Tainan Taiwan

ISBN: (纸本)189170625X

Many bio-signals of the chronic patients could be measured by various bio-devices and transferred to back-end system over the wireless network through the homebox. In a home-care environment, it becomes more complex to reliably process transmitting and receiving these bio-signals by the homebox. While the bio-devices increasing, the process is even much more complex. In addition, the chronic patients always hope to be served correctly and suitably by the service system in the house. Therefore, we have to provide services such as adjusting room temperature and lighting etc to make those patients’ daily lives easy. In this paper, we propose a personalized service recommendation system (PSRS) based on users’ preferences and habits. The PSRS has capability of providing suitable services. Furthermore, we construct personal models to record the patients’ daily activities and habits. Through the models, the system will be able to automatically launch to safety alert, recommendable services and healthcare services in the house. In the future, the proposed system and models could even carry out the mobile health monitor and promotion in a home-care environment © 2009 by Knowledge Systems institute Graduate School.

关键词： Recommender systems

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Real time process algebra with urgency executing policy

Real time process algebra with urgency executing policy

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作者： Chen, Wenbo Zheng, Guang Li, Lian Wu, Jinzhao School of Information Science and Engineering Lanzhou University Lanzhou 730000 China School of Computer and Information Technology Beijing Jiaotong University Beijing 100044 China Chengdu Institute of Computer Applications Chinese Academy of Sciences Chengdu 610054 China

Real time systems have a natural executing policy of urgency. However, real time process algebras of nowadays cannot specify this basic executing policy which limits their expressiveness. There is only one default policy called "maximal progress" in process algebras which is not enough to specify the behaviors of real time systems. Based on this, we propose a real time process algebra with urgency executing policy which can specify the behaviors of real time systems. © 2009 Academy Publisher.

关键词： Real time systems

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Design and implementation of an efficient two-level scheduler for cloud computing environment

Design and implementation of an efficient two-level schedule...

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ARTCom 2009 - International Conference on Advances in Recent Technologies in Communication and Computing

作者： Sadhasivam, Sudha Jayarani, R. Nagaveni, N. Vasanth Ram, R. Dept. of Computer Science and Engineering PSG College of Technology Coimbatore India Dept. of Computer Technology and Applications Coimbatore Institute of Technology Coimbatore India Dept. of Mathematics Coimbatore Institute of Technology Coimbatore India Dept. of Electronics and Communication Engineering PSG College of Technology Coimbatore India

ISBN: (纸本)9780769538457

Cloud computing focuses on delivery of reliable, fault-tolerant and scalable infrastructure for hosting Internet based application services. This paper presents the implementation of an efficient Quality of Service (QoS) based Meta-Scheduler and Backfill strategy based light weight Virtual Machine Scheduler for dispatching jobs. The user centric meta-scheduler deals with selection of proper resources to execute high level jobs. The system centric Virtual Machine (VM) scheduler optimally dispatches the jobs to processors for better resource utilization. We also present our thoughts on scheduling heuristics that can be incorporated at data center level for selecting ideal host for VM creation. The implementation can be further extended at the host level, using Inter VM scheduler for adaptive load balancing in cloud environment. © 2009 IEEE.

关键词： Virtual machine

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Cryptanalysis of a remote user authentication scheme based on bilinear pairing

Cryptanalysis of a remote user authentication scheme based o...

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2009 International Conference on Apperceiving Computing and Intelligence Analysis, ICACIA 2009

作者： Yan, Yue-Hao Wang, De-Song Li, Jian-Ping Li, Li-Gang Sichuan Top Vocational Institute of Information Technology of China Chengdu 611743 China School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 China International Centre for Wavelet Analysis and Its Applications Logistical Engineering University Chongqing 400016 China

ISBN: (纸本)9781424452040

Remote user authentication scheme is a mechanism which allows a server to authenticate a remote user over insecure channel. Recently, Goriparthi et al. made an enhancement based on Das et al.'s remote user authentication scheme using bilinear pairings. The scheme has the merits of no verification table, freely changing password and preventing the forgery attack and the replay attack. This paper, however, demonstrates that Goriparthi et al.'s improved scheme is vulnerable to the insider attack, the denial-of-service attack, and the server spooling attack. ©2009 IEEE.

关键词： Smart cards

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Modeling and analysis of adaptive buffer sharing scheme for consecutive packet loss reduction in broadband networks

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World Academy of science, engineering and Technology 2009年 39卷 418-425页

作者： Kausha, Sakshi Sharma, R.K. Department of Computer Science and Engineering University Institute of Engineering and Technology Panjab University Chandigarh India School of Mathematics and Computer Applications Thapar University Patiala India

High speed networks provide realtime variable bit rate service with diversified traffic flow characteristics and quality requirements. The variable bit rate traffic has stringent delay and packet loss requirements. The burstiness of the correlated traffic makes dynamic buffer management highly desirable to satisfy the Quality of Service (QoS) requirements. This paper presents an algorithm for optimization of adaptive buffer allocation scheme for traffic based on loss of consecutive packets in data-stream and buffer occupancy level. Buffer is designed to allow the input traffic to be partitioned into different priority classes and based on the input traffic behavior it controls the threshold dynamically. This algorithm allows input packets to enter into buffer if its occupancy level is less than the threshold value for priority of that packet. The threshold is dynamically varied in runtime based on packet loss behavior. The simulation is run for two priority classes of the input traffic - realtime and non-realtime classes. The simulation results show that Adaptive Partial Buffer Sharing (ADPBS) has better performance than Static Partial Buffer Sharing (SPBS) and First In First Out (FIFO) queue under the same traffic conditions.

关键词： Quality of service

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CPDCF for IEEE 802.11 WLANs

CPDCF for IEEE 802.11 WLANs

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2009 4th International Conference on Communications and Networking in China, CHINACOM 2009

作者： Chen, Chia-Mei Wang, Chi-Hsuan Wu, Mingzoo Department of Management Information System National Sun Yat-sen University Taiwan Department of Computer Science and Information Engineering National Cheng Kung University China Innovative DigiTech-Enabled Applications and Services Institute Institute for Information Industry Taiwan

ISBN: (纸本)9781424443376

The contention-based DCF suffers from collision seriously under heavy load conditions. In this paper, a novel medium access control protocol called Contention-Polling Duality Coordination Function (CPDCF) is proposed to enhance the DCF-based MAC protocol. A polling ACK mechanism is introduced to admit the designated station to transmit without performing any contention process. By eliminating collisions and preventing waste from idle backoff slots, the system capacity is increased effectively. A mathematical model is developed to analyze the saturation throughput of the CPDCF with various CP combinations. The performance in terms of fairness is studied as well. The model accuracy is verified via extensive simulations. Numerical results show that the well-managed CPDCF can achieve a significantly higher system capacity than the legacy DCF does. The proposed CPDCF is quite feasible, effective, and can be easily integrated with the widespread DCF-based devices.

关键词： Wireless local area networks (WLAN)

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一种新的外网访问内网的混合方法

一种新的外网访问内网的混合方法

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中国电子学会信息论分会2009年研究生学术交流会

作者： Meng Yanlin 蒙艳琳 Nie Jun 聂俊 Fu Hongguang 符红光 School of Computer Science and Engineering UESTCChengdu 电子科技大学计算机科学与工程学院成都611731 Chengdu Institute of Computer Applications CAS Chengdu 中国科学院成都计算机应用研究所自动推理实验室成都610041

比较和分析了现有三种外网访问内网的主要方式。提出一种新的基于DDNS(动态域名解析)、UPnP(通用即插即用)和Squid的外网访问内网的方法，详细论述了该方法的实现原理。当系统中路由器开通UPnP功能时，路由器将内网服务器映射到公网，... 详细信息

比较和分析了现有三种外网访问内网的主要方式。提出一种新的基于DDNS(动态域名解析)、UPnP(通用即插即用)和Squid的外网访问内网的方法，详细论述了该方法的实现原理。当系统中路由器开通UPnP功能时，路由器将内网服务器映射到公网，外网可直接访问内网服务器;当系统中UPnP功能没有开启时，外网对内网的访问请求将转发到中转服务器，然后从中转服务器获取访问结果。给出了利用此种方法实现外网对内网的WEB访问的关键技术。最后，分析和总结了该方法的优点。

关键词：网络互联远程访问混合控制动态域名解析通用即插即用技术

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Learning Navigation Map on Ontology

Learning Navigation Map on Ontology

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IEEE International Symposium on Dependable, Autonomic and Secure Computing (DASC)

作者： Tianying Chen Hongguang Fu Chengdu Institute of Computer Applications Chinese Academy and Sciences Chengdu China School of Computer Science and Engineering UESTC Chengdu China

The paper utilizes semantic Web and knowledge service technologies to construct a subject-oriented learning navigation system used in middle school education. The system inherently builds a knowledge base by ontology to store the relationship of subject knowledge points to learning resource and relationship between knowledge points , displays the reticulated structure of knowledge (navigation map) formed by visualizing knowledge base, and aggregates corresponding learning resource of knowledge point to enable learners practice their learning process according to the navigation map. The thesis build ontology for navigated learning to achieve pragmatic learning navigation, there are several advantages for this innovative research: the reticulated structure of knowledge in a certain subject could be displayed briefly and straightforward; the system could recommend related and further study materials for learners and intelligently discover the weak knowledge points of learners according to automated reasoning on knowledge base. The system also provides an interactive environment for both teachers to edit the knowledge structure and learners to study. As the most popular knowledge model, we mainly discusses the establishment of semantic knowledge Web, model of the knowledge base, knowledge storage for knowledge points in junior and senior schools, and the realization and utilization of the ontology-based navigation map.

关键词： Navigation Ontologies Educational institutions Semantic Web Educational technology Paper technology Displays Visualization Aggregates Intelligent structures

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Wu's Elimination Method in Graphing Calculator

Wu's Elimination Method in Graphing Calculator

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International Workshop on Education Technology and computer science, ETCS

作者： Jun Nie Tianying Chen Hongguang Fu Chengdu Institute of Computer Applications Chinese Academy and Sciences Chengdu China School of Computer Science and Engineering UESTC Chengdu China

Wu's method is one of the most popular approach to solve multivariate nonlinear equations proposed by Wu Wentsun. Wu's elimination method is the main idea of Wu's method. It is widely used in mechanical proving, automated reasoning, scientific computing, computer graphics, etc. The graphics calculator is commonly used in education and advanced mathematics research. Before Wu's elimination method has been implemented on personal computers, however it's not adaptive for movable learning. Hence we propose a scheme and algorithm on graphing calculator according to characteristics of embedded system and implement the algorithm in Noah graphing calculator. Our program can also be used in other graphing calculator based on GIAC. It is very helpful for better understanding of elimination in multivariate nonlinear equations for mathematics education.

关键词： Polynomials Nonlinear equations computer science education computer science computer graphics Educational programs Mathematics Terminology Educational technology computer applications

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Dynamic Geometry in Graphing Calculator

Dynamic Geometry in Graphing Calculator

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International Workshop on Education Technology and computer science, ETCS

作者： Tianying Chen Jun Nie Hongguang Fu Chengdu Institute of Computer Applications Chinese Academy and Sciences Chengdu China School of Computer Science and Engineering UESTC Chengdu China

The dynamic geometry system is a typical CAI application that utilizes computer technology to guide geometry learning. In our research of the dynamic geometry on handheld devices, we have successfully implemented a brand new system called "mathematic sketchpad", a part of the Noah graphing calculator. Compared to other similar products like TI or CASIO graphing calculator, the sketchpad owns features such as advanced mathematic functions, true color screen and touch-pen operations that emphasize powerful and user-friendly purpose. Different from PC software, the sketchpad have advantages such as portability, mobile teaching and classroom interactive teaching that are good for mathematics education. Besides, the dynamic geometry system on "mathematic sketchpad" is built on computer algebra basis that allows numeric-symbolic combination to handle even difficult tasks. In this paper, we will briefly introduce the implementation of sketchpad, corresponding theories that make dynamic geometry possible, and give some examples that can be used in teaching.

关键词： computer aided instruction Computational geometry Mathematics computer science education Algebra Educational technology computer applications Application software computer science Handheld computers

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