著者

Shin J.-H. Sohn H.-J. Choi K.-S. Kwon B.-J. Choi C.-U. Kim J.-H. Hwang E.-K. Park J.-H. Kim J.-Y. Choi S.-H. Kim O.-K.

出版者

社団法人日本獣医学会

雑誌

The journal of veterinary medical science (ISSN:09167250)

巻号頁・発行日

vol.65, no.1, pp.1-7, 2003-01-25

被引用文献数

1 15

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韓国は1934年以来口蹄疫の発生はなかったが,2000年3月から4月にかけて15箇所でOタイプの口蹄疫発生が生じた.同時期に台湾,中国,日本,ロシア,モンゴルでも,牛または豚にOタイプの口蹄疫発生が報告された.南北朝鮮境界非武装地帯から約5kmに位置する農場において口蹄疫擬似患畜が検出され,緊急調査を行った.病原ウイルスは,3D polymerase 領域,IRES領域,1D/2B領域を対象としたRT-PCR,抗原検出および型別検出用ELISAにより,口蹄疫ウイルスOタイプであることを同定した.発病牛の水疱を材料として1D/2B領域の塩基配列を調べた結果,台湾で分離された口蹄疫OタイプKinmen株と98%の類似性が認められた.原因ウイルスは若齢マウス経代後,黒ヤギ胎児肺細胞接種により分離された.

著者

Tokuda Shin-ichi Hayatsu Masahito

出版者

一般社団法人日本土壌肥料学会

雑誌

Soil science and plant nutrition (ISSN:00380768)

巻号頁・発行日

vol.50, no.3, pp.365-374, 2004-06

被引用文献数

7

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Nitrous oxide (N_2O) is one of the main greenhouse gases, and accurate estimation of the N_2O flux from fertilized arable land is required. It is known that acidic tea field soil displays a higher N_2O production activity than neutral arable soil and that tea fields could be a major source of N_2O. Therefore, N_2O fluxes from four plots (Std, 2N, 2Ca and -Ca plots) in a tea field that had been subjected to different conditions of fertilizer management were measured using the closed chamber method over a period of two years, and the relationships between the N_2O flux and soil environmental factors were analyzed. The amounts of nitrogen fertilizer and liming material (dolomite) applied to the Std plot were 600 kg N ha^<-1> y^<-1> and 1,500 kg ha^<-1> y^<-1>, respectively. The amount of nitrogen fertilizer applied to the 2N plot was two-times larger than that applied to the Std plot and corresponded to the conventional level in Japanese tea fields. The soil was acidified due to heavy nitrogen fertilization in the 2N plot. The 2Ca plot was amended with two-times the amount of liming material of the Std plot and in the -Ca plot no liming material was applied. There were significant differences among the N_2O fluxes from the plots, and the highest value of N_2O flux was 8.785 mg N m^<-2> h^<-1> in the 2N plot. Annual emission rate and emission factor of N_2O in the 2N plot were 25.22kg N_2O-N ha^<-1> and 2.10%, respectively. Both long-term heavy nitrogen fertilization and subsequent soil acidification possibly enhanced the N_2O flux from the tea field. The N_2O flux from the tea field showed temporal variations, namely the N_2O flux was relatively low from December to March possibly due to the low soil temperature and it increased gradually after March as the soil temperature increased over 10℃. The N_2O flux reached the first major peak in July, decreased transiently in August presumably due to the drying of soil, increased again and reached the second peak in September or October, and then decreased after November. Multiple linear regression analysis of the relationships between the N_2O flux and soil environmental factors indicated that the N_2O production activity was significantly related to the N_2O flux from the tea field. The N_2O production activity showed temporal variations corresponding to the temporal variations of the N_2O flux.

著者

Watanabe Shin

出版者

Tukuba English Linguistic Society

雑誌

Tsukuba English Studies (ISSN:09116184)

巻号頁・発行日

vol.22, pp.325-339, 2004-03-05

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1. Introduction This article is about Japanese question. It serves to complement a theory that I developed elsewhere (Watanabe (2002)). I review the previous research in section 2 as a starting point. ...

著者

SUZUKI Shin'ichi

出版者

一般社団法人日本教育学会

雑誌

Educational studies in Japan : international yearbook : ESJ (ISSN:18814832)

巻号頁・発行日

no.1, pp.101-104, 2006-12

著者

Yoon Won-Ju Chung Sang-Hwa Park Shin-Jun

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Electronics Express (ISSN:13492543)

巻号頁・発行日

vol.6, no.7, pp.361-367, 2009

被引用文献数

1 3

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We propose an efficient tag collection algorithm utilizing empty time slots in active RFID systems. In the proposed tag collection algorithm, the reader recognizes the existence of empty time slots via carrier sensing, and utilizes the redundant empty time slots to transmit sleep commands to the tags collected, resulting in performance improvement for tag collection. The simulation results show that the proposed tag collection algorithm can reduce the average tag collection time by 12.28%, 12.30%, and 13.31%, for the framed slotted aloha with the fixed 128 time slots and 256 time slots, and the dynamic framed slotted aloha anticollision protocols, respectively.

著者

Tsuyoshi Ogata Yoshinao Yamazaki Nobuhiko Okabe Yosikazu Nakamura Masato Tashiro Noriko Nagata Shigeyuki Itamura Yoshinori Yasui Kazutoshi Nakashima Mikio Doi Youko Izumi Takashi Fujieda Shin'ichi Yamato Yuichi Kawada

出版者

Japan Epidemiological Association

雑誌

Journal of Epidemiology (ISSN:09175040)

巻号頁・発行日

pp.0807040024, (Released:2008-07-07)

参考文献数

20

被引用文献数

28 30

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Background: H5N2 avian influenza virus infection of humans has not been reported thus far. The first H5N2 avian influenza infection of poultry in Japan occurred in Ibaraki. Methods: The subjects were workers at 35 chicken farms in Ibaraki Prefecture, where the H5N2 virus or antibody was isolated from chickens. None of the subjects exhibited influenza symptoms. The H5N2-neutralizing antibody titers of the first and second paired sera samples were compared. To investigate the possible factors for this increase, the H5N2-neutralizing antibody titer (1:40 or more) was calculated for the second samples. A logistic regression analysis was performed to examine the association of these factors with H5N2-neutralizing antibody positivity. Results: We performed Wilcoxon matched-pairs signed-ranked test on data collected from 257 subjects, and determined that the H5N2 antibody titers of the second paired sera samples were significantly higher than those of the first samples (P < 0.001). The H5N2 antibody titers of paired sera of 13 subjects without a history of seasonal influenza vaccination within the previous 12 months increased 4-fold or more. The percentage of antibody positivity was 32% for subjects with a history of seasonal influenza vaccination (28% of all subjects) and 13% for those without a history of the same. The adjusted odds ratio of H5N2-neutralizing antibody positivity was 4.6 (95% confidence interval: 1.6-13.7) for those aged over 40 and 3.1 (95% confidence interval: 1.6-6.1) for those with a history of seasonal influenza vaccination within the previous 12 months. Conclusion: The results suggest that this may have been the first avian influenza H5N2 infection of poultry to affect humans. A history of seasonal influenza vaccination might be associated with H5N2-neutralizing antibody positivity.

著者

Shin-ichi Minato Kimihito Ito

出版者

The Japanese Society for Artificial Intelligence

雑誌

Transactions of the Japanese Society for Artificial Intelligence (ISSN:13460714)

巻号頁・発行日

vol.22, no.2, pp.156-164, 2007 (Released:2007-01-25)

参考文献数

17

被引用文献数

2 4

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In this paper, we present a method of finding symmetric items in a combinatorial item set database. The techniques for finding symmetric variables in Boolean functions have been studied for long time in the area of VLSI logic design, and the BDD (Binary Decision Diagram) -based methods are presented to solve such a problem. Recently, we have developed an efficient method for handling databases using ZBDDs (Zero-suppressed BDDs), a particular type of BDDs. In our ZBDD-based data structure, the symmetric item sets can be found efficiently as well as for Boolean functions. We implemented the program of symmetric item set mining, and applied it to actual biological data on the amino acid sequences of influenza viruses. We found a number of symmetric items from the database, some of which indicate interesting relationships in the amino acid mutation patterns. The result shows that our method is helpful for extracting hidden interesting information in real-life databases.

著者

Shin-ichi Minato Hiroki Arimura

出版者

The Japanese Society for Artificial Intelligence

雑誌

Transactions of the Japanese Society for Artificial Intelligence (ISSN:13460714)

巻号頁・発行日

vol.22, no.2, pp.165-172, 2007 (Released:2007-01-25)

参考文献数

11

被引用文献数

1 5 9

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Frequent item set mining is one of the fundamental techniques for knowledge discovery and data mining. In the last decade, a number of efficient algorithms for frequent item set mining have been presented, but most of them focused on just enumerating the item set patterns which satisfy the given conditions, and it was a different matter how to store and index the result of patterns for efficient data analysis. Recently, we proposed a fast algorithm of extracting all frequent item set patterns from transaction databases and simultaneously indexing the result of huge patterns using Zero-suppressed BDDs (ZBDDs). That method, ZBDD-growth, is not only enumerating/listing the patterns efficiently, but also indexing the output data compactly on the memory to be analyzed with various algebraic operations. In this paper, we present a variation of ZBDD-growth algorithm to generate frequent closed item sets. This is a quite simple modification of ZBDD-growth, and additional computation cost is relatively small compared with the original algorithm for generating all patterns. Our method can conveniently be utilized in the environment of ZBDD-based pattern indexing.