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Multicast based and fast handover scheme in mobile IPv6 wireless network

Multicast based and fast handover scheme in mobile IPv6 wire...

引用

International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, iWAT

作者： Yong Chu Eu S. Khatun B.M. Ali M. Othman Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Computer and Communication System Engineering Faculty of Engineering University of Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Communication Technology and Network Faculty of Science Computer Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

The main goal of mobile IPv6 is that a mobile node is always addressable by its home address, whether it is currently attached to its home link or is away from home. Mobile IPv6 enables applications running on an Internet node to survive physical reconnection by inserting a few additional features at the network layer. In this paper, focus is given to a micro-mobility based test-bed development with improved algorithm. The test-bed consists of both hardware and software, including four PCs and one laptop. The laptop is used as mobile host (MH), two PCs act as access points, one PC becomes the home agent (HA) and one PC is used as a multicast router (ML). This test-bed is used to verify the theoretical enhancement of the micro-mobility handover algorithm via the results (packet loss, handover delay and quality of service). There is no signaling traffic overload between the MH, HA and correspondent host (CH), the handover delay is low, approximately below 10 ms, and the video stream has good reception.

关键词： Wireless networks Multicast algorithms Personal communication networks Portable computers Delay Application software IP networks Software testing Hardware Quality of service

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Fully decentralized DHT based approach to grid service discovery using overlay networks

Fully decentralized DHT based approach to grid service disco...

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International Conference on computer and Information Technology (CIT)

作者： Qi Xia Ruijun Yang Weinong Wang De Yang Department of Computer Science and Engineering Network Information Center Shanghai Jiaotong University Shanghai China School of Information Science and Engineering Central South University Changsha China

Distributed hash table (DHT) is widely used in peer-to-peer networks for its scalability, adaptability, and fault-tolerance in large and dynamic environments. In this paper, we study on the application of DHT for grid service discovery. Grid service is represented by multiple (attribute, value) pairs. The virtual organization (VO) is also self-organized into a 2-dimensional network overlays - one for attributes, and the other for values - as nodes join and publish services in the VO. Service discovery in a VO is firstly directed to the attribute overlay to find the nodes with the discovered attributes, then to the value overlay until the nodes which have the same (attribute, value) are reached. Gateway servers are deployed on the border to interconnect different VO's. The service discovery request can be redirected to other VO's in case that there is no provider in the requester's own VO. Our approach is highly efficient, scalable and quick responsive.

关键词： Peer to peer computing Protocols Space technology Scalability network servers computer science Information science Middleware Routing Fault tolerance

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Development of ground penetration radar using impulse technology

Development of ground penetration radar using impulse techno...

引用

Asia-Pacific Microwave Conference

作者： Jeong, Young-Kyung Lee, Moon-Que Park, Young-Jin Kim, Kwan-Ho Youn, Dong-Gi Rhee, Young-Chul KEES South Korea IEEE Department of Electrical and Computer Engineering University of Seoul Seoul South Korea RF-CMOS MMIC Power Telecommunication Network Korea Eleotrotechnology Research Institude(KERI) Euiwang City kyunggi-do South Korea Ultra Technology Co. Ltd Seoul South Korea Division of Information and Communication Engineering KyungNam University Mansn-City GyeongsangNam-do South Korea

ISBN: (纸本)078039433X

We developed ultra-wideband impulse type ground penetrating radar(UWB-GPR) system with 100 similar to 300MHz frequency band at -10dB bandwidth. The prototype of the system was tested in real environment and 2-D visualization of raw data was achieved. Experimental results show that UWB-GPR system has a good ability in detecting for buried metal objects between 0.5m and 3m depth under ground in domestic field.

关键词： ultra wideband ground penetrating radar radar signal processing image processing

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Detecting incoming and outgoing DDoS attacks at the edge using a single set of network characteristics

Detecting incoming and outgoing DDoS attacks at the edge usi...

引用

IEEE Symposium on computers and Communications (ISCC)

作者： C. Siaterlis V. Maglaris Network Management and Optimal Design (NETMODE) Lab Department of Electrical and Computer Engineering National and Technical University of Athens Athens Greece

Detection of distributed denial of service attacks should ideally take place near their sources, at edge networks, where countermeasures are most effective. DDoS detection by monitoring an over-provisioned backbone link either near the source or the victim is challenging because congestion isn't the identifying anomaly signature. Most research efforts try to identify a single detection metric that can reliably detect DDoS attacks. On the contrary, we use multiple metrics to successfully detect flooding attacks at the edge and classify them as incoming or outgoing attacks with an artificial neural network (ANN). We explore the DDoS detection ability of multi-layer perceptrons (MLP) as classifiers we can teach by example. The inputs of the MLP are metrics coming from different types of passive measurements that are available today to network administrators. We use these metrics to feed our MLP, train it and evaluate its performance in terms of 'false positive' and 'true positive' rates in the face of new data. Our analysis is based on data from several experiments that were conducted with the use of common DDoS tools in the production network of a university network. We show that the MLP is capable of classifying the state of the monitored edge network as 'DDoS source,' 'DDoS victim' or 'normal'. This way an edge network can use a single mechanism to protect itself from incoming DDoS attacks and at the same time protect the rest of the network from outgoing attacks.

关键词： computer crime Spine Floods Monitoring Artificial neural networks Protection Clustering algorithms Multilayer perceptrons Feeds Data analysis

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An enhanced dynamic framed slotted ALOHA algorithm for RFID tag identification

An enhanced dynamic framed slotted ALOHA algorithm for RFID ...

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International Conference on Mobile and Ubiquitous Systems: networking and Services (MobiQuitous)

作者： Su-Ryun Lee Sung-Don Joo Chae-Woo Lee Department of Electrical and Computer Engineering Ajou University Suwon South Korea LG Electronics Network Laboratory Anyang South Korea

In RFID system, one of the problems that we must solve is the collision between tags which lowers the efficiency of the RFID system. One of the popular anti-collision algorithms is ALOHA-type algorithms, which are simple and shows good performance when the number of tags to read is small. However, they generally require exponentially increasing number of slots to identify the tags as the number of tag increases. In the paper, we propose a new anti-collision algorithm called enhanced dynamic framed slotted ALOHA (EDFSA) which estimates the number of unread tags first and adjusts the number of responding tags or the frame size to give the optimal system efficiency. As a result, in the proposed method, the number of slots to read the tags increases linearly as the the number of tags does. Simulation results show that the proposed algorithm improves the slot efficiency by 85/spl sim/100% compared to the conventional algorithms when the number of tags is 1000.

关键词： RFID tags Technical Activities Guide -TAG Radiofrequency identification Frequency Heuristic algorithms Bandwidth ISO standards IEC standards Supply chains Banking

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Secure Protocols Enhancement Based on Radio-propagation Related Looser Assumptions in Mobile Ad hoc networks

Secure Protocols Enhancement Based on Radio-propagation Rela...

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IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Ruijun Yang Qi Xia Weinong Wang Qunhua Pan Xinli Huang Minglu Li Network Information Center Shanghai Jiaotong University Department of Computer Science and Engineering Shanghai Jiaotong University China Network Information Center Shanghai Jiaotong University China

The paper presents secure protocols and new secure challenges based on looser radio propagation assumptions. According to these, a new secure enhancement mechanism for secure protocols is proposed. Then we exemplify the DoS attacks and protections as the illustration. The research indicates it will increase the usability of secure protocols in common applications.

关键词： Protocols Intelligent networks Mobile ad hoc networks Radio propagation Ad hoc networks Protection computer science computer crime Usability Design methodology

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Web prediction using online support vector machine

Web prediction using online support vector machine

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Zhili Zhang Changgeng Guo Shu Yu DeYu Qi Songqian Long Computer Network Center Xuchang University Xuchang China College of Computer Science and Engineering Technology South China University of Technology Guangzhou China Department of Information Engineering Vocational and Technical College of Communications Xuchang China

In this paper, a SVM-based online learning algorithm is proposed and applied to the problem of Web prediction. A method to construct an online LS-SVM multi-class learning model has been presented. This method is able to capture the inherent sequentiality of Web visits and successfully predict the future accesses. The experimental results show the effective performance of our method

关键词： Support vector machines World Wide Web History Support vector machine classification Educational institutions Web server computer networks Information science Telecommunication traffic network servers

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Design of a thin multi-aperture infrared imager

Design of a thin multi-aperture infrared imager

引用

Frontiers in Optics, FiO 2005

作者： Gibbons, Robert C. Gilstrap, Jeff A. Mait, Joseph N. Prather, Dennis W. Guo, Junpeng Brady, David J. Raytheon Company Network Centric Systems/Combat Systems 2501 West University Drive McKinney Texas 75071 United States US Army Research Laboratory AMSRD-ARL-SE-R 2800 Powder Mill Road Adelphi MD 20783-1197 United States Department of Electrical and Computer Engineering University of Delaware 140 Evans Hall Newark DE 19716 United States Electrical and Computer Engineering Department Duke University Durham North Carolina 27708 United States

We have designed a thin, multiplexed infrared imaging system that uses a diffractive element for generating shift-encoded images in each aperture. We present preliminary experimental results that demonstrate imager pe... 详细信息

ISBN: (纸本)1557527970

关键词： Electronics Infrared systems Point spread function Signal processing Diffractive optics (050.1970) Infrared imaging (110.3080) Multiple imaging (110.4190)

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Hardware cryptography for ubiquitous computing

Hardware cryptography for ubiquitous computing

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： M. Fukase R. Akaoka Liu Lei Cheng Tong Shu T. Sato Department of Electronic and Information Systems Engineering Hirosaki University Hirosaki Japan Computer and Network Systems Center Hirosaki University Hirosaki Japan

Progressive ubiquitous networks have impressed us with alternative features, diversity or security. When the diversity from small devices to large machines is in normal states, ubiquitous networks are functional and useful. But, it is hard to control if abnormal states once happen. Since the diversity brings about open-access to ubiquitous networks anytime anywhere, this really threatens user security. The key to protect huge amount of multimedia data in ubiquitous networks is to introduce safety aware high-performed single VLSI processor systems embedded with cipher process. TPM (trusted platform module) is a cutting-edge technique developed for the front-end security of a ubiquitous device. Since this works for a short, password-size text data, it does not always promise the complete safety of multimedia data stored in the ubiquitous device. In order to solve this fatal issue, we have developed a mobile processor dedicated to multimedia cryptography. This paper focuses on the multimedia cryptography by the dedicated processor.

关键词： Hardware Cryptography Ubiquitous computing Streaming media Data security Safety Protection Information systems Systems engineering and theory Electronic mail

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Handheld devices with large shared display groupware: tools to facilitate group communication in one-to-one collaborative learning activities

Handheld devices with large shared display groupware: tools ...

引用

IEEE International Workshop on Wireless, Mobile and Ubiquitous Technology in Education (WMUTE)

作者： Chen-Chung Liu Lin-Chuan Kao Graduate Institute of Network Learning Technology National Central University Taiwan Department of Computer Science and Engineering Yuan-Ze University Taiwan

One-to-one computing environments change and improve classroom dynamics since individual students can bring handheld devices fitted with wireless communication capabilities into the classrooms. However, the screens of handheld devices, being designed for individual-user mobile application, limit promotive interaction among groups of learners. The lack of a shared visual focus among group learners impedes group interactions and leads to fragmented and tete-a-tete communication patterns. This study proposes a shared display groupware and explores whether the use of shared displays in classrooms can augment the handheld devices and enhance the effectiveness of handheld devices in promoting communication among participants. Experiments confirmed that the proposed shared display groupware promoted shared understanding of the workspace and increased awareness of partner actions. Collaboration was boosted by creating the opportunity for students with handheld devices to perform ideal communication patterns and avoiding tete-a-tete and fragmented communication patterns.

关键词： Collaborative work Handheld computers Collaborative software Mobile communication computer displays computer networks Wireless networks Mobile computing Wireless communication Application software

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