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International Conference on Natural Computation (ICNC)

作者： Weihong Wang Kai Pei Xiaogang Jin College of Software Zhejiang University of Technology Hangzhou China State Key Laboratory of Software Development Environment Beijing Aeronautics and Astronautics University Beijing China AI Institute College of Computer Science University of Zhejiang Hangzhou China

As there is a rapid rampancy of malicious intrusion, people pay more attentions to the network security. This paper presents a new method based on Hilbert-Huang trans- form (HHT) to characterize intrusions that can detect many kinds of intrusion according to the number of packets. This paper demonstrates the usefulness of such a method to differentiate abnormal data from normal data. Experiments are performed using intrusion detection data sets and tested for validation. Some results are reported along with analysis and concluding remarks.

关键词： Computer networks Educational institutions Intrusion detection Space technology Testing Programming Artificial intelligence Computer science Computer security Data security

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Designing Security Protocols Using Novel Neural Network Model

Designing Security Protocols Using Novel Neural Network Mode...

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International Conference on Natural Computation (ICNC)

作者： Tieming Chen Rongrong Jiang College of Software Engineering Zhejiang University of Technology Hangzhou China State Key Laboratory of Software Development Environment Beihang University Beijing China Department of Computer Science and Technology Zhejiang Radio and Television University Hangzhou China

Two neural networks with the common input vector can finally synchronize their weight vectors by output- based mutual learning. It can be well utilized to negotiate secure information over a public channel. Designing security protocols based on such synchronized neural network model is quite advantageous for its low-cost and high-performance. In this paper, we at first analyze and optimize the interacting network neurl, then present a cryptography-oriented secure parity model and implement the performance simulations. As an instance, a novel key agreement protocol design scenario is finally proposed.

关键词： Neural networks Cryptography Cryptographic protocols Information security Analytical models Computational modeling Computer security Programming Educational institutions software engineering

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Collaborative filtering recommendation algorithm based on cloud model

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Ruan Jian Xue Bao/Journal of software 2007年第10期18卷 2403-2411页

作者： Zhang, Guang-Wei Li, De-Yi Li, Peng Kang, Jian-Chu Chen, Gui-Sheng State Key Laboratory of Software Development Environment Beihang University Beijing 100083 China Institute of Electronic System Engineering Beijing 100840 China Information Security Center Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055 China School of Computer Science and Technology Shandong Jianzhu University Ji'nan 250101 China

Recommendation system is one of the most important technologies applied in e-commerce. Similarity measuring method is fundamental to collaborative filtering algorithm, and traditional methods are inefficient especially when the user rating data are extremely sparse. Based on the outstanding characteristics of Cloud Model on the process of transforming a qualitative concept to a set of quantitative numerical values, a novel similarity measuring method, namely the likeness comparing method based on cloud model (LICM) is proposed in this paper. LICM compares the similarity of two users on knowledge level, which can overcome the drawback of attributes' strictly matching. This work analysis traditional methods throughly and puts forward a novel collaborative filtering algorithm, which is based on the LICM method. Experiments on typical data set show the excellent performance of the present collaborative filtering algorithm based on LICM, even with extremely sparsity of data.

关键词： Electronic commerce

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2-dimentional spatio-temporal data model for moving objects in network

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Cehui Xuebao/Acta Geodaetica et Cartographica Sinica 2007年第3期36卷 329-334页

作者： Chen, Bi-Yu Chen, Xiao-Ling Chen, Hui-Ping Wang, Chang-Hai State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China Key Lab. of Poyang Lake Ecological Environment and Resources Development Jiangxi Normal University Nanchang 330022 China Guangxi Electric Power Industry Investigation Design and Research Institute Nanning 530023 China

With the increasing popularity of mobile positioning device and wireless communications, storage and query of dynamically changing information of moving objects in network has become feasible. It can be widely used in such applications as VNS, LBS, and ITS. However, due to their special spatiotemporal conditions, there is still a lack of efficient data-model to support storage and queries about trajectories. In view of this, we developed a new spatiotemporal model, named 2-Dimensional Spatio-Temporal data model for Moving Objects in Network (2DSTMON), to deal with network constrain trajectories. In the model, trajectories from (x, y, t) space were transformed to 2-D space;thus, they could be described as vector polyline, and stored in mature spatial database. That updating operations by motion vectors were employed made updating at low frequency and storing at a little capacity possible. Finally, we implemented the 2DSTMON model and then validated them through a series of experiments.

关键词： Mobile telecommunication systems

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An fast integrated searching strategy and application in multi-source massive image database for Disaster Mitigation and Relief

An fast integrated searching strategy and application in mul...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Ran Zhang Xiaoling Chen Xiaobin Cai Biyu Chen Jianzhong Lu Wei Wu Xubin Yang State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University of China Wuhan China The Key Lab of Poyang Lake Ecological Environment and Resource Development Jiangxi Normal University Nanchang Jiangxi China National Disaster Reduction Center of China Beijing China School of Remote Sensing Information Engineering Wuhan University of China Wuhan China

Disaster mitigation and relief (DMR) has been paid much more attention from national or local governments in China. Multi-source remotely sensed data with different spatial, spectral and temporal resolutions were widely applied in DMR (e.g. disaster warning, rapid response, loss evaluation and reconstruction, etc.), and have been a main data source in the database of DMR Although some famous remote sensing image database engines have the power to organize, store and manage massive image data, their searching efficiency in massive imagery is poor because of the fact that the temporal, spatial and spectral attributes were not taken account in their image database construction procedure. Especially for the preprocessed imagery used in DMR, the common image management software packages usually store and manage them as individual scene depending upon the catalog. It leads to a low efficiency for searching and accessing images. In this study, a novel fast integrated searching strategy (FISS) was proposed and a set of grid indexes were designed to project multi-dimensional image data with multi-temporal, multispectral and multispatial resolutions to the 2-D space. The required image data at different locations for any acquired dates, spectral and spatial resolutions could be rapidly searched by different dimensional indexes. In order to improve the speed and efficiency of data access, the preprocessed images were divided into tiles and compressed. FISS makes the system be interactive and more convenient to the users. It has been used in disaster mitigation and relief database of disaster reduction in China. In this paper, the proposed searching technique was compared with traditional ones, the results showed that FISS could accelerate searching speed, shorten disaster emergency response time.

关键词： Image databases Spatial resolution Image resolution Local government Image reconstruction Spatial databases Remote sensing Engines Disaster management Energy management

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A predictive handoff approach for mobile IP

A predictive handoff approach for mobile IP

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2nd International Conference on Wireless and Mobile Communications, ICWMC 2006

作者： Zhang, Da-Wei Yao, Yi State Key Lab. of Software Development Environment BeiHang University China

ISBN: (纸本)0769526292

We propose a predictive handoff mechanism which can predict the occurrence of link layer handoff precisely. It can be used as a trigger for Mobile IP to start network layer handoff ahead or pre-allocate resources. Using this approach, link layer of MN(Mobile Node) detects signal strength changes of base stations to calculate the probability of coming handoff and triggers network layer handoff based on mobility model and RFM(Recursive Forgetting Memory linear square). In this paper we illustrate the mechanism of this approach in detail and provide experiments to evaluate the performance. The results show that this approach can provide an exact trigger with low rates of false alarm and missed detection. It can significantly shorten handoff latency and reduce packet loss in Mobile IP. © 2006 IEEE.

关键词： Internet protocols

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Architecture research on Beijing public traffic information services system 13

Architecture research on Beijing public traffic information ...

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13th World Congress on Intelligent Transport Systems and Services, ITS 2006

作者： Gang, Wang Yong, Du Wentao, Liu Xin, Gao Qing, Chi Beijing Communication Information Cente State Key Lab of Software Development Environment China BeiHang University School of Mechanical Engineering China JiNan University China

With the continuous developing of economy, the amount of cars in Beijing increase constantly. On the contrary, the increase of traffic information service, cannot satisfy the increasing trip require ments. As the direct subordinates of Beijing Municipal Committee of Communication, Beijing Communication Information Center has been applying itself to research how to integrate current isolated systems, and construct Beijing public traffic information services system, in order to serve travelers dynamic, synthetic and convenient traffic information. This paper mainly proposed system architectures from different point of view, and listed the software and hardware require ments of the system constructing.

关键词： Information services

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A quick map-matching algorithm for large-scale float car data processing 13

A quick map-matching algorithm for large-scale float car dat...

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13th World Congress on Intelligent Transport Systems and Services, ITS 2006

作者： Wu, Dongdong Zhu, Tongyu Wang, Gang Du, Yong State Key Lab. of Software Develop Environment Beihang University 37#Xueyuan Road Beijing100083 China State Key Lab. of Software Develop Environment Beihang University China Beijing Municipal Transportation Information Center China

The traditional map-matching algorithms are often ready for Vehicle Navigation Systems, which always request complicated computation model and need continuous and close GPS data whose interval is just about 1 second. When raising the accuracy, they lower the efficiency, and are not applicable to process the larger scale GPS data. This paper presents an efficient map-matching algorithm which is very applicable to the real-time traffic information system using large-scale Float Car Data (FCD). This approach designs a kind of data structure of road network and introduces the ideas of partitioning the road network into small grids and dividing the structure of the road network into two levels. It creates the index for the path with the small grid and the direction of line-segment in the road. Examples are provided on a large data set for the Beijing area. The paper demonstrates the efficiency of the algorithm in terms of accuracy and computational speed.

关键词： Global positioning system

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Mobile routing approach of mobile IP protocol

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Jisuanji Gongcheng/Computer Engineering 2006年第5期32卷 107-109+174页

作者： Zhang, Dawei Tian, Lin Tan, Min Xia, Yinben State Key Lab. of Software Development Environment Beijing University of Aeronautics and Astronautics Beijing 100083 China

This paper analyzes the functions of two IP addresses of mobile node in routing, and proposes a mobile routing approach using ARP cheat. This approach doesn't need to make any changes to the routing configuration of mobile node, and it makes use of the ARP scheme to establish routing rapidly, so it reduces the interference of mobile routing establishment with the communication recovery. This paper also analyzes the realization and performance of this approach.

关键词： ARP cheat Mobile IP Mobile routing

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Method of link layer trigger in mobile IP

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Jisuanji Gongcheng/Computer Engineering 2006年第11期32卷 133-135+164页

作者： Xia, Yinben Zhang, Dawei Tian, Lin State Key Lab. of Software Development Environment Beijing University of Aeronautics and Astronautics Beijing 100083 China

To reduce handoff latency in mobile IP, two link layer trigger methods are proposed. The link layer inspection method removes the latency of movement detection and the method of link layer handoff prediction can trigger network layer handoff before link layer handoff. These methods trigger network handoff only when it is decided the mobile node enters into new subnet through binding network information in link layer property of base station or acquiring information of current subnet and neighboring subnet from foreign agent, so these methods can avoid blind network handoff.

关键词： Handoff Link layer trigger Mobile IP

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