JaLCDOI 10.18926/fest/12819
FullText URL 13_023_033.pdf
Author Zenihana, Tomohiro| Hisakane, Naoto| Morimoto, Tomoko| Ishikawa, Hirofumi|
Abstract We carried out simulations of various scenarios for bioterrorist attacks using smallpox occurring in a virtual area set up on the basis of the census of Okayama-city, Japan, which predict the effect of control strategies against bioterrorism and the loss scale. On simulating a smallpox epidemic, we followed the method of the Individual Based Model stochastically, which can treat the population in the virtual area as individuals. Individuals have personal information, behavior patterns, and interactions among social groups. We took into consideration the influence of residual immunity due to past vaccination. We considered Traced Vaccination (TV) and Mass Vaccination (MV) strategies against bioterrorism. We investigated the effect of TV and MV strategies on the suppression of smallpox epidemics. Consequently, the TV strategy was found to have higher effectiveness than the MV strategy.
Keywords smallpox bioterrorism Individual Based Model Traced Vaccination Mass Vaccination
Publication Title 岡山大学環境理工学部研究報告
Published Date 2008-03
Volume volume13
Issue issue1
Start Page 23
End Page 33
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002304844
Author Fukuhara, Kazuma| Phompida, Samlane| Insisiengmay, Sithat| Kirinoki, Masashi| Chigusa, Yuichi| Nakamura, Satoshi| Matsuda, Hajime| Ishikawa, Hirofumi|
Published Date 2011-12
Publication Title Parasitology International
Volume volume60
Issue issue4
Content Type Journal Article
Author Nishina, Tomohiko| Ishikawa, Hirofumi|
Published Date 2008-02-01
Publication Title Parasitology Research
Volume volume102
Issue issue3
Content Type Journal Article
JaLCDOI 10.18926/fest/11424
FullText URL 011_009_014.pdf
Author Nishina Tomohiko| Tian Tian Chen| Fujita Kazutoshi| Ishikawa, Hirofumi|
Abstract The red fox (Vulpes vulepes) and the vole ( Clethrionomys refocanus) are principal hosts of Echinococcus multilocularis in Hokkaido, Japan. How protoscoleces increases in voles and the level of immunity in foxes remain unknown because of the lack of survey data, so that it is important to clarify these mecahnisms in order to develop control strategies against E. multilocularis. In this study, the growth of protoscoleces in the infected voles was approximated as the logistic curve, the level of immunity in the fox was assumed to depend on the experience of the infection with E. multilocularis, and the worm burden in the fox was assumed to be governed by the amount of protoscoleces in the vole. Our model showed that the population densities of the hosts and the level of immunity influenced the prevalence of the E. multilocularis.
Keywords Echinococcus multilocularis protoscoleces immunity worm burden stochastic model
Publication Title 岡山大学環境理工学部研究報告
Published Date 2006-03-15
Volume volume11
Issue issue1
Start Page 9
End Page 14
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002314034
Author Ishikawa, Hirofumi| Ohga, Yukio| Doi, Rikuo|
Published Date 2003-07-29
Publication Title Parasitology Research
Volume volume91
Issue issue6
Content Type Journal Article
JaLCDOI 10.18926/fest/11449
FullText URL 009_019_026.pdf
Author Sakamura Kenichi| Dong Wang Xiao| Ishikawa, Hirofumi|
Abstract We have investigated the linear cryptanalysis of AES cipher in this article. As the previous encryption standard DES could be broken by the linear cryptanalysis, NIST decided a new encryption standard AES in 2000. We try to analyze one and two rounds AES cipher by the method of the linear cryptanalysis and learn the limits of this mehtod. AES cipher provides a conspicuous difficulty in breaking its keys because of small bias of its S-box. We report the experimental results of success rate and are led to conclusion that this method would not work well on more than 3 rounds to break keys.
Keywords AES Chosen plaintext attack Linear cryptanalysis
Publication Title 岡山大学環境理工学部研究報告
Published Date 2004-02-27
Volume volume9
Issue issue1
Start Page 19
End Page 26
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313376