检索结果-内蒙古大学图书馆

Adaptive and iterative gene selection based on least squares support vector regression

Journal of information and Computational Science 2006年第3期3卷 443-451页

作者： Jiang, Jingqing Wu, Chunguo Song, Chuyi Liang, Yanchun Key Laboratory of Symbol Computation and Knowledge Engineering College of Computer Science and Technology Jilin University Changchun 130012 China College of Mathematics and Computer Science Inner Mongolia University for Nationalities Tongliao 028043 China Key Laboratory of Information Science and Engineering of Railway Ministry The Key Laboratory of Advanced Information Science and Network Technology of Beijing Beijing Jiaotong University Beijing 100044 China

Cancer classification and identification are major areas in medical research. DNA microarrays could provide useful information for cancer classification at the gene expression level. The number of genes in a microarray is always several thousands while the number of training samples always several dozens. In such case most of the machine learning models suffer from the overfitting and it is necessary to select a handful of most informative genes. An adaptive and iterative gene selection algorithm based on least squares support vector machines is proposed in this paper. The algorithm adopts sequential forward selection search scheme. The number of selected genes can be determined adaptively. The total number of genes processed by the proposed algorithm is smaller than that processed by other algorithms using support vector machines. Results of numerical experiments show that the proposed algorithm trains fast and achieves comparable performance on two well-known benchmark problems.

关键词： Genes

来源：评论

学校读者我要写书评

暂无评论

Robust moving object segmentation in the compressed domain for H.264/AVC video stream

Robust moving object segmentation in the compressed domain f...

引用

25th PCS: Picture Coding Symposium 2006, PCS2006

作者： Yang, Gaobo Yu, Shengfa Zhang, Zhaoyang Network and Information Security Lab School of Computer and Communication Hunan University Changsha Hunan 410082 China School of Electronic Science and Engineering National University of Defense Technology Changsha Hunan 410073 China Key Laboratory of Advanced Displays and System Application Shanghai University Ministry of Education Shanghai 200072 China

ISBN: (纸本)300018726X

Moving object segmentation in the compressed domain plays an important role in many real-time applications, e.g. video indexing, video surveillance, etc. H.264/AVC is the up-to-date video coding standard, which employs several new coding tools and provides a different video format. In this paper, a robust spatio-temporal segmentation approach to extract moving objects in the compressed domain for H.264 video stream is proposed. Coarse moving objects are firstly extracted from the motion vector field through the MRF classification process. Spatial segmentation is based on the HT coefficient, which is used to refine the object boundary of temporal segmentation results. Fusion of spatio-temporal segmentation is based on region projection based labeling technique. Further edge refinement is performed to smooth the object boundaries. The performance of the proposed approach is illustrated by simulation carried on several test sequences. Experimental results show that the proposed approach can provide the visually similar results as by using spatial domain process with much less computational complexity.

关键词： Image segmentation

来源：评论

学校读者我要写书评

暂无评论

Efficient Access Control in Wireless network

Efficient Access Control in Wireless Network

引用

Web Intelligence and Intelligent Agent Technology Workshops (WI-IAT)

作者： Kun Wang Zhenguo Ding Lihua Zhou Key Laboratory of Computer Network and Information Security of the Ministry of Education Xidian University Xi'an China School of Remote Education Xidian University Xi'an China

To use role-based access control (RBAC) in wireless network is difficult than that in wired network. RBAC needs to search relative tables to get the user's permissions. We present an access control judgment algorithm which bases on artificial neural network (ANN). The algorithm reduces the data transmission using bit string to express roles and permissions. The algorithm employs set theory to represent roles and their inheritance hierarchy, as well as conflicted permissions. It uses selected roles as input vectors and the matching permissions which contain no conflict as the output vectors to train the ANN. Then it uses the trained ANN to compute directly users' permissions when the system is under running condition, instead of searching tables. That improves the efficiency of access control. The algorithm is simple and efficient, which makes it easy to be realized in wireless networks

关键词： Access control Wireless networks Permission Artificial neural networks computer science education Data communication Intelligent agent Laboratories computer networks information security

来源：评论

学校读者我要写书评

暂无评论

Improved traitor tracing scheme based on bilinear map

引用

Beijing Youdian Daxue Xuebao/Journal of Beijing University of Posts and Telecommunications 2006年第6期29卷 17-20页

作者： Zhang, Xue-Jun Zhou, Li-Hua Wang, Yu-Min Key Laboratory of Computer Network and Information Security Xidian University Xi'an 710071 China

Tô et al. presented a bilinear-map-based traitor tracing scheme with revocation, but it is a symmetric scheme because it does not provide non-repudiation. An improved Tô scheme was proposed using oblivious polynomial evaluation (OPE) protocol and service parameters. Under the precondition of general sameness capabilities of both Tô's and improved Tô's scheme, the new scheme adds some advantages such as providing multi-service capability, user's non-repudiation and data provider's no framing innocent users. Furthermore, it is also proved to be semantically secure under the decisional bilinear Diffie-Hellman problem (DBDH) assumption.

关键词： Security of data

来源：评论

学校读者我要写书评

暂无评论

Portable aromatic VOC gas sensor for onsite continuous air monitoring with 10-ppb benzene detection capability

引用

NTT Technical Review 2006年第1期4卷 30-37页

作者： Horiuchi, Tsutomu Ueno, Yuko Camou, Serge Haga, Tsuneyuki Tate, Akiyuki NTT Microsystem Integration Laboratories Atsugi-shi 243-0198 Japan Network Hardware Integration Laboratory NTT Microsystem Integration Laboratories Chemical Society of Japan Japan Society for Analytical Chemistry Spectroscopical Society of Japan Materials Analysis Center Leading-Edge Key Technology Business Headquarters NTT Advanced Technology Corporation Physical Society of Japan Optical Society of Japan Institute of Electronics Information and Communication Engineers of Japan

We have developed a portable gas sensor using microfluidic devices (concentration and detection cells) for detecting and identifying gaseous aromatic volatile organic compounds (VOCs), such as benzene, toluene, xylene, styrene, and ethylbenzene. To improve the sensor's sensitivity, we introduced techniques for the precise control of gas transfer from the concentration cell to the detection cell and optimized the spectrum measurement conditions. We achieved a detection level of 10 ppb for benzene gas as an example of aromatic VOC detection in a sampling time of 50 minutes. The calibration curve showed good linearity in the range of 10-100 ppb of benzene. We also carried out gas-monitoring experiments in a garage. The results show the applicability of our aromatic VOC sensor for field monitoring.

关键词： Chemical sensors

来源：评论

学校读者我要写书评

暂无评论

Disaster recovery system model with e-government case study

引用

Natural Hazards Review 2006年第4期7卷 145-149页

作者： Wang, Kun Li, Long-Hai Yuan, Feng Zhou, Li-Hua Key Laboratory of Computer Network and Information Security Xidian Univ. Ministry of Education Xi'an 710071 Shaanxi China Dept. of Computer Science and Technology Xidian Univ. Xi'an 710071 Shaanxi China National Information Security Engineering and Technology Research Center Beijing 100093 China

We present a robust disaster recovery system model according to the requests of disaster recovery talent of a key e-government project of China. The model strengthens the safe communication ability and guarantees the secure command on disaster recovery. It introduces a self-supervision power to watch the integrality and security of the disaster recovery system itself. It makes the use, management, and maintenance of the disaster recovery system much easier through the real-time visible platform. This model suits security-critical environments for owning the features of security, robustness, and controllability. It has guided the construction of an e-government disaster recovery system of China. © 2006 ASCE.

关键词： Disaster prevention

来源：评论

学校读者我要写书评

暂无评论

Ternary Tree based Group key Management in Dynamic Peer networks

引用

International Conference on Computational Intelligence and Security

作者： Wei Wang Jianfeng Ma Sangjae Moon Key Laboratory of Computer Networks and Information Security Ministry ofEducation Xidian University Xi'an China Mobile Network Security Technology Research Center Kyungpook National University Daegu South Korea

ISBN: (纸本)1424406048

For group-oriented applications, designing secure and efficient group key management schemes is a major problem. We present a group key management scheme for dynamic peer networks, which supports join, leave, merge and partition events. In the scheme, the numbers of rounds and messages are close to the lower bounds of those for dynamic group key management, and the length of messages and computation costs are less than those of the existing schemes. Furthermore, this scheme provides forward secrecy, backward secrecy and key independence

关键词： computer network management Protocols information security Computational efficiency Technology management Laboratories computer science education Cryptography Moon Mobile computing

来源：评论

学校读者我要写书评

暂无评论

FDEWS 2.0: A Web-GIS-Based Early Warning System for Fish Disease via Water Quality Management

FDEWS 2.0: A Web-GIS-Based Early Warning System for Fish Dis...

引用

World Congress on Intelligent Control and Automation (WCICA)

作者： Nan Li Zetian Fu Boqi Wang Xiaoshuan Zhang College of Engineering China Agricultural University Beijing China College of Resources and Environment China Agricultural University Beijing China Key Laboratory for Modern Precision Agriculture System Integration China Agricultural University Beijing China Key Laboratory for computer information management technology Suzhou University Jiangsu China

The water quality is the most vital factor in a successfully healthy aquaculture. After investigation by 415 fish disease cases and experiments, it is found that eutrophication and the pollutants of NH3, H2S as well as heavy metals and organic compounds are the main reasons of inducing fish disease in the north of China. Generally speaking, an early warning system for fish disease based on water management is a cheaper and alternative choice available for the fish farmers to warn the risks and to minimize disease problems. A Web-GIS-based fish disease early-warning system (FDEWS 2.0) based on water quality management has been developed by us. Building a water quality monitoring network in the aquafarm and integrating a series of simulation models with the GIS and the World-Wide-Web (WWW) are the key advantages of this system

关键词： Alarm systems Marine animals Diseases Quality management Water pollution Aquaculture Organic compounds Risk management Monitoring Geographic information Systems

来源：评论

学校读者我要写书评

暂无评论

Packet-level adaptive sampling on multi-fluctuation scale traffic

Packet-level adaptive sampling on multi-fluctuation scale tr...

引用

2005 International Conference on Communications, Circuits and Systems

作者： Xu, Li-Bo Wu, Guo-Xin Li, Jian-Fei Key Laboratory of Computer Network and Information Integration Southeast University Nanjing 210096 China

ISBN: (纸本)0780390156

In high-speed Internet links, effective and efficient packet sampling technology in traffic measurement becomes more and more indispensable for its benefits of reducing data quantity and saving various resources. We address the Issue of how to keep or improve sampling accuracy during burst or fluctuation periods. In the paper, an adaptive packet-level sampling method on different traffic fluctuation and burst scales is proposed. The method can dynamically adjust each packet sampling probability dependent on the magnitude of traffic fluctuation. The adjustment granularity is fine because it reaches single packet. By contrast to static random sampling method in experiments using real traffic trace, we show that the proposed adaptive sampling has great capability to trace traffic fluctuations and Improve sampling accuracy through capturing more fluctuation or burst details. © 2005 IEEE.

关键词： Telecommunication traffic

来源：评论

学校读者我要写书评

暂无评论

TCS-Chord: An improved routing algorithm to Chord based on the topology-aware clustering in self-organizing mode

TCS-Chord: An improved routing algorithm to Chord based on t...

引用

1st International Conference on Semantics, Knowledge and Grid, SKG 2005

作者： Ye, Liu Peng, Yang Zi, Chu Jiagao, Wu Key Laboratory of Computer Network and Information Integration Ministry of Education Southeast University Nanjing 210096 China

ISBN: (纸本)0769525342

The study on semantic routing efficiency of DHTP2P networks is a key element to promote the development of P2P networks, it is critical for a P2P routing algorithm to be aware of the network physical topology, which leads to improvement of the routing efficiency. By analyzing the Hashing function's properties, some novel logical connections are presented among the destination node, the Chord semantic routing relay node sequence, and the ID of clustering neighbor nodes. This paper describes TCS-Chord (an improved routing algorithm to Chord based on the Topology-aware Clustering in Self-organizing mode) to improve the efficiency of Chord routing. Since the clustering nodes only have local views in the self-organizing mode, some rules are applied for a node to learn other nodes ' physical topology-aware locations. The TCS-Chord's routing algorithm is described completely, and our experiments also indicate that TCS-Chord can improve the Chord semantic routing efficiently. © 2006 IEEE.

关键词： Routing algorithms

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：