| 1. On the Effect of Traffic Regulation to the Quality of Services in Integrated Services Networks | |
| author: | Yusheng JI(National Institute of Informatics) |
| abstract: | In order to ensure the quality of services while maintaining the level of network resource utilization, it is necessary to regulate traffic by traffic control methods such as traffic shaping or policing mechanisms. On the other hand, letting traffic to obey a certain traffic rule can cause degradation of end-to-end service quality. In this paper, we focus on the efficiency of traffic control schemes when they are applied to various kinds of traffic. Statistical information such as data collected from real-time video transmission as well as pseudo random numbers are used here to capture the variety of traffic characteristics. Our results show that it is efficient to reduce delay and buffer requirement on multiplexing nodes with traffic regulator applied on some kinds of traffic such as Poisson-oriented sources, but shaping may cause too much delay to long-ranged bursty traffic while getting very little gain. |
| 2. Learning First-Order Rules to Handle Medical Data | |
| author: | Ryutaro ICHISE(National Institute of Informatics),Masayuki NUMAO(Tokyo Institute of Technology) |
| abstract: | Since information systems are used in large hospitals, a large amount of medical data is provided to physicians which often constitutes an information overload. Consequently, computers must extract useful information from such data. The most difficult issue in handling medical data is that included time-series data have irregularities. Here, we describe handling this type of data using a first order logic learning system named DAMS |
| 3. The Collection of Typhoon Image Data and the Establishment of Typhoon Information Databases Under International Research Collaboration between Japan and Thailand | |
| author: | Asanobu KITAMOTO(National Institute of Informatics),Kinji ONO(National Institute of Informatics) |
| abstract: | This paper describes our ongoing project under international research collaboration between Japan (National Institute of Informatics) and Thailand (Asian Institute of Technology) for the collection of typhoon image data and the establishment of typhoon information databases. Statistics on past typhoon records reveal that approximately one thirds of the typhoons formed in the Northwest Pacific basin have entered into South East Asia and this fact indicates the importance of the research into the analysis and prediction of typhoons in order to prevent or reduce massive damage from typhoons in this vulnerable region. Our challenge to this goal is unique in that our approach is mainly based on the informatics paradigm, namely based on ideas and techniques developed in the informatics community, in contrast to the traditional paradigm based on meteorology. The underlying infrastructure in this new paradigm is the large collection of typhoon images created from Japanese meteorological satellite GMS-5 Himawari. However, when observing South East Asia through this satellite, satellite images tend to show degradation in effective resolution and shape distortion due to earth curvature. Hence we demonstrate that satellite images from another type of satellite called NOAA can compensate the drawbacks of GMS-5, and can provide high quality typhoon imagery over South East Asia. We also point out that NOAA data received in Thailand are relevant data source for this combination, and that effective infrastructure for exchanging huge amount of satellite data is the SINET international link between Thailand and Japan. |
| 4. A Fast Algorithm of k-Nearest Neighbor Search in the Similarity Retrieval of Image Databases | |
| author: | Teruyoshi WASHIZAWA(Waseda University (Canon Research Center)), Toru YADA(Waseda University), Yasuhiko YASUDA(National Institute of Informatics (Waseda University)) |
| abstract: | In this paper, we propose a fast algorithm for k-nearest neighbor search in high dimensions. The complexity of most existing algorithms including k-d tree and R-tree grows exponentially with dimension. In content-based image retrieval, the number of dimensions of feature vectors is more than . Static space partitioning methods are not suitable to relevance feedback for realizing "human in the loop." Moreover, the performance of the projection algorithm proposed by Friedman et. al which is well known as the basic method of dynamic space partitioning methods degrades with increasing dimentionarity. In this paper, we propose an approximation of the projection algorithm to improve the performance in high dimensionarity. The proposed algorithm is verified by simulation in which the correctness and computation time of both algorithms are compared. In simulation, both synthesized and real image data set are used. Our algorithm obtains at least 90% correctness in 50% search time relative to that by the exhaustive search in 200 dimensional space. |
| 5. An Approach to Structural Analysis of Japanese Composite Terms by Supplying Verbs | |
| author: | Teruo KOYAMA(National Institute of Informatics) |
| abstract: | In various scholarly domains, domain specific terms are constructed as composites of existing words. And, therefore it is very important to analyze the structure of composite terms. However, in case of composite terms, which consist of common nouns, the analysis is quite difficult. In this paper, the author proposed a method supplying a verb to the composite. Each element words are related to the verb according to the case against the verb, and the structure of the composite is classified using the case pattern. |
| 6. A Study on Informatics-Related Research Fields at Japanese Universities | |
| author: | Masaki NISHIZAWA(National Institute of Informatics), Yuan SUN(National Institute of Informatics), Masaharu YANO(National Institute of Informatics) |
| abstract: | According to the database of Directory of Researchers and the Directory of University Professors and Researchers in Japan, we found that number of researchers in the Interdisciplinary Area, especially in the information science, had been increasing. Also we found that researchers whose majors are information science tend to engage in research in other fields. In this study, we first extract key words from research themes of each researcher by using a Japanese morpheme analysis system "Chasen." Based on common key words in each research field, we analyze the relations between the so-called Information Science (the three items of which are, Computer Science, Intelligent Informatics, and Study of Information System) and other research fields at Japanese universities. The results show for example that Computer Science has strong relations with Educational Engineering, Information and Communication Engineering, Mathematics and Statistical Science, while Study of Information System has strong relations with Social System Engineering, Commercial Science and Business Administration. Also, it is indicated that Study of Information System has the related fields the most, Intelligent Informatics has the second many of them and Computer Science has the third, according to the numbers of standardized total agreement of the three to all the research fields. |
| 7. Analysis of International Research Trend on the Fields of Humanities and Social Sciences through Scientific Journals | |
| author: | Morio SHIBAYAMA(National Institute of Informatics) |
| abstract: | In this paper, I analyze international situation of journal publication and relationship among research fields, and investigate research trend on the fields of humanities and social sciences in comparison with the fields of natural sciences through bibliographic information of scientific journals compiled in U.S. ISI database utilized for citation analysis. It is revealed that situation of journal publication, e.g. share of journals and type of publishers, varies in individual field of humanities and social sciences. Humanities have lower connection and social sciences have higher one to natural sciences. The paper summarizes the results of this investigation and refers to the measures of promoting these fields, that is meaning of "globalization" and "cooperation" from viewpoint of journal publication, in Japan. |
| 8. Service and Intellectual Property in the Information Society | |
| author: | Mitsuhiro FUKUDA(National Institute of Informatics) |
| abstract: | The essence of the typography and the Industrial Revolution was that changing service into information made reproduction of service easier than before. The Intellectual Property Law was born to deal with this situation. Now computers are changing management of information into information, so that the Business Methods Patent issue is happening to us. We begin to doubt the validity of the framework of the Patent Law sticking to material goods and the laws of nature. |
| 9. Report on NACSIS-CAT Project at Zurich University | |
| author: | Akira MIYAZAWA(National Institute of Informatics), Mariko ADACHI(Japanese Library, University of Zurich) |
| abstract: | This is report of a project to use Japanese bibliographic utility NACSIS-CAT from European university library. The project started in 1996, following the UK-NACSIS-CAT project and ended in 2000. As the local system, which is a critical issue for the NACSIS-CAT utilization, Zurich University Japanese Library developed its own system using a database management system 4-th Dimension on Macintosh computer. For the NACSIS-CAT connection, it uses NACPC and developed a system to import download data from NACPC to the local system. It took about three years from the first to become operational. This paper reports the details of this project, including Intermedium and final report from Zurich University Japanese Library. |