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Advanced semisoft handoff method of cellular IP access networks

Advanced semisoft handoff method of cellular IP access netwo...

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International Conference on Advanced information Networking and Applications (AINA)

作者： Joungwoong Lee S. Kimura Y. Ebihara Doctoral Program in Systems and Information Engineering University of Tsukuba Japan Institute of Information Sciences and Electronics University of Tsukuba Japan

Mobile IP is the current standard for supporting global mobility, however the performance degrades to support micro mobility. Cellular IP could be a good solution to accommodate efficiently hundreds of, thousands of mobile hosts that perform fast and frequent handoff in a small local area network. In semisoft handoff of cellular IP, a mobile host sends a semisoft packet to the new base station before performing actual handoff to guarantee that the routing cache mapping associated with the new base station is created before actual handoff takes place. But packet loss and handoff delay are still occurred by this model. We propose an advanced semisoft handoff method with no packet loss but with additional small packet delay just before or after handoff. In this method, the cross-over node calculates the time for the last message to be delivered to the mobile host via the old base station just before handoff based on four typical network models. On receiving that packet, the mobile host performs handoff to the new base station. Our simulation experiment results show that the proposed semisoft handoff method actually outperforms the traditional semisoft handoff method in both handoff packet loss and handoff delay. We study the performance of the advanced semisoft handoff method with the network models.

关键词： Cellular networks Base stations Routing Degradation Local area networks Protocols Analytical models Systems engineering and theory Added delay IP networks

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A proposal of DNS-based adaptive load balancing method for mirror server systems and its implementation

A proposal of DNS-based adaptive load balancing method for m...

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International Conference on Advanced information Networking and Applications (AINA)

作者： H. Yokota S. Kimura Y. Ebihara Doctoral Program in Engineering University of Tsukuba Japan Institute of Information Sciences and Electronics University of Tsukuba Japan

In order to protect a server to become overloading due to concentration of accesses, a mirror server system is widely used for distributing the load to multiservers. For such a system, it is very important for users to select an appropriate one among the servers. In the previous systems, the DNS (domain name system) Round-Robin mechanism is widely adopted for this purpose, otherwise users must choose a server by themselves. Even in the former method, however, since all servers are evenly assigned to clients without any cares of the performance and process status of the servers, the load of each server is deflected. To solve the above problem, this article proposes a new adaptive load balancing method based on the ordinary DNS Round-Robin mechanism. In this proposal, a DNS server for the mirror-server system periodically probes the status of each server. For a query from each client, the DNS server changes its response from the probed results and IP address of the client. Finally, the prototype system of the proposal is implemented and the file transfer speeds of both the proposed method and Round-Robin DNS method are estimated for the mirror server system of RingServer Project in Japan.

关键词： Proposals Load management Mirrors Network servers Web server Domain Name System Protection Probes Prototypes File servers

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Heterogeneous remote computing system for computational astrophysics with OmniRPC

Heterogeneous remote computing system for computational astr...

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Workshops on Applications and the Internet (SAINT)

作者： K. Onuma T. Boku M. Sato D. Takahashi H. Susa M. Umemura Doctoral Program of Systems and Information Engineering University of Tsukuba Japan Institute of Information Sciences and Electronics Centre for Computational Physics University of Tsukuba Japan Department of Physics Rikkyo University Japan Institute of Physics Centre for Computational Physics University of Tsukuba Japan

We have developed a hybrid computing system named HMCS-G (Grid-enabled Heterogeneous Multi-Computer System) which combines multiple cluster systems and a special purpose machine for gravity calculations. The purpose of HMCS-G is to provide ideal computation environment for computational astrophysics, which requires multiple physics phenomena for precise and detailed simulation. There are two categories of machines required for this system, that is, multiple PC-clusters for general purpose computation such as hydro-dynamics and a special purpose machine GRAPE-6 which calculates gravity for all pairs of particles in the system with very high-speed. These systems are connected with a grid-RPC named OmniRPC which supports Globus and ssh for authentication. Our HMCS-G enables the worldwide access to GRAPE-6 cluster which provides several TFLOPS performance for gravity calculation. All participating PC-clusters share this resource in time sharing manner with grid technology. For efficient usage of GRAPE-6 resource, we modified the original server cluster of it for multiple clients running in various network environment. Currently, precise simulations on galaxy formation are being performed on clusters in several institutes with smoothed particle hydrodynamics and radiative transfer under complete gravity calculation, as the first real application on HMCS-G.

关键词： Astrophysics Gravity Pipelines Physics computing Grid computing Computational modeling Authentication Time sharing computer systems File servers Network servers

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Active research experience for undergraduates increases students' motivation and academic performance

Active research experience for undergraduates increases stud...

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2003 ASEE Annual Conference and Exposition: Staying in Tune with engineering Education

作者： Deek, Fadi Briller, Vladimir Friedman, Robert Durga, Mishra Joshi, Kamal New Jersey Institute of Technology College of Computing Sciences Information Technology Program Information Systems NJIT Outcomes Assessment New Jersey Institute of Technology Undergraduate Programs College of Computing Sciences NJIT Department of Electrical Engineering New Jersey Institute of Technology NJIT Institutional Research Dapartment

An active research experience for undergraduates (REU) was discussed. Research experience for undergraduate students provides educational experience through specially designed active research projects. A quasi-experimental design was applied to analyze the impact of REU on academic achievements. Retention rates, cummulative grade point average (GPA) and overall academic persistence measured by ratio of earned and attempted credit hours were also analyzed. Educational outcomes such as obtaining graduate education and employment were measured.

关键词： engineering education

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Reconfigurable architecture for probabilistic neural network system

Reconfigurable architecture for probabilistic neural network...

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IEEE International Conference on Field-programmable Technology (FPT)

作者： R. Mizuno N. Aibe M. Yasunaga I. Yoshihara Doctoral Program Systems and Information Engineering University of Tsukuba Japan Institute of Information Sciences and Electronics University of Tsukuba Japan Faculty of Engineering Miyazaki University Japan

Reconfigurable architecture for the probabilistic neural network (PNN) is proposed and the PNN hardware system is developed using FPGAs. In the system, preprocessing circuits as well as the PNN can be reconfigured adapting each task. Potential performance of the PNN cannot be brought out until the total reconfigurability including the preprocessing is achieved. The developed system shows high recognition accuracy with high processing speed for some image recognition tasks.

关键词： Reconfigurable architectures Neural networks Neural network hardware Kernel Field programmable gate arrays Counting circuits Image recognition Neurons Registers Systems engineering and theory

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Reconfigurable parallel comparation architecture and its application to IP packet filters

Reconfigurable parallel comparation architecture and its app...

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IEEE International Conference on Field-programmable Technology (FPT)

作者： N. Aibe M. Yasunaga Graduate School Doctoral Program Systems & Information Engineering University of Tsukuba Tsukuba Ibaraki Japan Institute of Information Sciences and Electronics University of Tsukuba Tsukuba Ibaraki Japan

We propose a novel architecture for variable comparator named RPCA (Reconfigurable Parallel Comparation Architecture) making full use of the reconfigurability of FPGA. In the RPCA, an appropriate comparator to each task can be chosen and implemented under the speed/data-size tradeoff. An RPCA-based pack-filter prototype using XILINX XCV300E-6PQ240C and RealTeK RTL8201BL is developed and filtering speed of 120ns for 128 IPs and 1,360ns for 2,048 IPs are obtained under the speed/data-size trade-off.

关键词： Prototypes Field programmable gate arrays information filtering information filters Pattern matching Intrusion detection Spine Buffer storage Systems engineering and theory Cryptography

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A method on tracking common boundaries of color regions in function approximation-based image coding

A method on tracking common boundaries of color regions in f...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： T. Sugiyama P.W.H. Kwan K. Toraichi K. Katagishi Doctoral Program Graduate School of Systems and Information Engineering University of Tsukuba Japan Core Research for Evolutional Science & Technology Program Japan Science and Technology Corporation Japan Institute of Information Sciences and Electronics University of Tsukuba Japan

A boundary tracking method crucial to function approximation-based image coding is proposed that solves the problems caused by duplicate tracking the common boundaries of color regions when methods conventionally applied to bilevel raster images are inappropriately used. Experimental evaluation is performed to verify its effectiveness.

关键词： Function approximation Image coding Colored noise Color Image reconstruction Systems engineering and theory Electronic mail Performance evaluation Spline Internet

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Two variables compactly supported fluency sampling functions-based scalable conversion for fundus photograph

Two variables compactly supported fluency sampling functions...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： S. Kai K. Katagishi K. Toraichi Y. Mitamura H. Murakami A. Koike T. Asami Doctoral Program Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Ibaraki Japan Institute of Informalion Sciences and Electronics University of Tsukuba Tsukuba Ibaraki Japan Graduate School of Engineering Hokkaido University Sapporo Japan KDDI Corporation Tokyo Japan KDD Research and Development Laboratories Inc. Kamifukuoka Saitama Japan

To match the different resolution capabilities of devices used in the telemedicine network, we must perform resolution conversion for fundus photograph to the required resolution with the information important to ophthalmologists' diagnosing well preserved. In this paper, in order to keep important information, such as color and shapes of blood vessels, optic disk and lesion areas on the fundus photograph after resolution conversion, we adopt three kinds of fluency functions to approximate shapes and propose a shape-directed resolution conversion method by using two variables compactly supported fluency sampling functions. The method leads the fundus photograph resolution conversion with features of scalability and good information preservation.

关键词： Sampling methods Interpolation Shape control Blood vessels Lesions Medical diagnostic imaging Biomedical optical imaging Photography Diseases Telemedicine

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Working ratio estimation method for a long distance fixed wireless access (22 GHz band, 6.3 Mbit/s) link

Working ratio estimation method for a long distance fixed wi...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Y. Ohmiya K. Katagishi A. Vasilache T. Asami H. Murakami K. Toraichi Doctoral Program Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba-shi Ibaraki Japan Institute of Information Sciences and Electronics University of Tsukuba Tsukuba-shi Ibaraki Japan Japan Science and Technology Corporation University of Tsukuba TARA Center Ibaraki Japan KDDI R&D Laboratories Inc. Kamifukuoka-shi Saitama Japan KDDI Corporation KDDI bldg. Shinjuku-ku Tokyo Japan

This paper discusses a method to determine the optimal node location before a long distance FWA network (22 GHz band, 6.3 Mbit/s) is set. During our 3 years experiment, we found out that the long distance FWA net with 2 links (about 60 km) was down for approximately 42 hours per year due to heavy rain fall conditions. This means that the long distance FWA net is practicable to some extent. We discuss a method to estimate the working ratio between two unknown locations using AMeDAS weather data. By using this method, an appropriate node location can be decided before FWA net is deployed. This approach can improve the working ratio in the sense of link-up continuation.

关键词： Rain Space technology Costs Systems engineering and theory Research and development Laboratories Telegraphy Delay Interference Space stations

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TAST-Trademark Application Assistant

TAST-Trademark Application Assistant

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IEEE International Conference on Image Processing

作者： P.W.H. Kwan K. Toraichi K. Kameyama F. Kawazoe K. Nakamura Doctoral Program Graduate School of Engineering University of Tsukuba Japan Institute of Information Sciences and Electronics University of Tsukuba Japan Doctoral Program Graduate School of Systems and Information Engineering University of Tsukuba Japan

In this paper, a Trademark Application Assistant (TAST) that aims to speed up the process of a successful trademark application is proposed. The core of TAST is a similarity-based image retrieval system that makes use of relaxation matching on extracted contour segments. A novelty of this research lies in the processing architecture introduced for adapting the highly effective but computation expensive relaxation matching algorithm to real-time image retrieval. Preliminary results illustrating the quality of matching and the scalability of the processing architecture in terms of response time are included. The proposed architecture is not limited to using relaxation matching based servers, but is also applicable to other types of matching server as well.

关键词： Trademarks Image retrieval Computer architecture Scalability Delay Character recognition Image databases Hardware Gray-scale Systems engineering and theory

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