Mathematical Biology Laboratory Department of Biology, Kyushu University

Joung-Hun Lee

NAME

Joung-Hun Lee

Email: clinamen2013[at]gmail.com
          traum98[at]bio-math10.biology.kyushu-u.ac.jp
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CURRENT POSITION

Visiting Assistant Professor, Department of Biology, Faculty of Science, Kyushu University

EDUCATION

  • March 1999 – June 2003, Ajou university, South Korea. Economics.
  • March 2005 – February 2007, Seoul National university, South Korea. Environmental management.
  • April 2010 – March 2013, Kyushu University, Japan. Biology.

RESEARCH INTERESTS

My research interest is resource management and I have built simple models that focus on resource users’ behavior or decision-making. For sustainable resource use, it is important to foster cooperative behavior because people (resource users or stakeholders)’s response can make difference in resource use. Previous projects applied a. widely accepted approach based on benefit maximization, b. searched way to enhance cooperative behavior, c. heterogeneity among people when they adjust strategies for improving their own benefit. Study of resource management raises critical problems in our society such as property right, rule crafting, punishment, etc which are essential for understanding of cooperation. Next goal in my study will be related those fundamental questions.

This figure illustrates the main result of the recent work (published in J. Theor. Biol.) which discusses the scheme of punishment, called graduated sanction. Sanction takes a greatly important rule for cooperation maintenance by affecting payoff function of each player. Long-lasting common resource management has known to have such a scheme of sanction (Ostrom, 1990) but this is not well explained in theoretical studies. We suggest conditions where this rule of sanction works efficiently with the assumption of pool punishment.

PUBLICATIONS

(7) Agent-based mapping of credit risk for sustainable microfinance, PLOS ONE, in press, (2015), Joung-Hun Lee. M. Jusup, B. Podobnik, Y. Iwasa.
(6) Coupled social and ecological dynamics of herders in Mongolian rangelands, Ecological Economics (2015), 114: 208-217. Joung-Hun Lee, K. Kakinuma, T. Okuro, Y. Iwasa.
(5) Games of corruption: How to suppress illegal logging, Journal of Theoretical Biology (2015), 367:1-13. Joung-Hun Lee, K. Sigmund, U. Dieckmann, Y. Iwasa.
(4) Modeling socio-economic aspects of ecosystem management and biodiversity conservation. Population Ecology (2014), 56: 27-40. Joung Hun Lee and Yoh Iwasa.
(3) Graduated punishment is efficient in resource management if people are heterogeneous. Journal of Theoretical Biology (2013), 333: 117-125, Yoh Iwasa and Joung Hun Lee.
(2) Optimal investment for enhancing social concern about biodiversity conservation: A dynamic approach, Theoretical Population Biology (2012), 82: 177-186. Joung Hun Lee and Yoh Iwasa
(1) J.H. Lee and Y. Iwasa. Tourists and traditional divers in a common fishing ground, Ecological Economics. 70(12): 2350-2360 (2011).

Kayoko Ohta

NAME

Kayoko Ohta

CURRENT POSITION

Technical assistant, Department of Biology, Faculty of Science, Kyushu University

PUBLICATIONS

(3) Chakraborty T, Mohapatra S, Tobayama M, Ohta Ka, Ryu YM, Kazeto Y, Ohta Ko, Zhou L, Nagahama Y, Matsubara T, Hatching enzymes disrupt aberrant gonadal degeneration by the autophagy/apoptosis cell fate decision. Sci Rep. 2017, 7(1):3183
(2) Kurta (Ohta) K, Burgess SM, Sakai N. Transgenic zebrafish produced by retroviral infection of in vitro-cultured sperm. PNAS 2004, 101(5): 1263-7
(1) Kurta (Ohta) K, Sakai N. Functionally distinctive testicular cell lines of zebrafish to support male germ cell development. Mol Reprod Dev. 2004, 67(4): 430-8

NAME

Masashi Iwamoto

Email: miwamoto[at]nih.go.jp
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CURRENT POSITION

Visiting Assistant Professor, Department of Biology, Faculty of Science, Kyushu University

PUBLICATIONS

(10) Iwamoto M, Cai D, Sugiyama M, Suzuki R, Aizaki H, Ryo A, Ohtani N, Tanaka Y, Mizokami M, Wakita T, Guo H, Watashi K: Functional association of cellular microtubules with viral capsid assembly supports efficient hepatitis B virus replication. Sci. Rep. 7(1): 10620 (2017).
(9) Shimura S, Watashi K, Fukano K, Peel M, Sluder A, Kawai F, Iwamoto M, Tsukuda S, Takeuchi S J, Miyake T, Sugiyama M, Ogasawara Y, Park SY, Tanaka Y, Kusuhara H, Mizokami M, Sureau C, Wakita T: Cyclosporin derivatives inhibit hepatitis B virus entry without interfering with NTCP transporter activity. J Hepatol. 66: 685-692 (2017)
(8) Tsukuda S, Watashi K, Hojima T, Isogawa M, Iwamoto M, Omagari K, Suzuki R, Aizaki H, Kojima S, Sugiyama M, Saito A, Tanaka Y, Mizokami M, Sureau C, Wakita T: A new class of hepatitis B and D virus entry inhibitors, proanthocyanidin and its analogs, that directly act on the viral large surface proteins. Hepatology, 65: 1104-1116 (2017)
(7) Kaneko S, Kakinuma S, AsahinaY, Kamiya A, Miyoshi M, Tsunoda T, Nitta S, Asano Y, Nagata H, Otani S, Kawai-Kitahata F, Murakawa M, Itsui Y, Nakagawa M, Azuma S, Nakauchi H, Nishitsuji H, Ujino S, Shimotohno K, Iwamoto M, Watashi K, Wakita T,& Watanabe M:Human induced pluripotent stem cell-derived hepatic cell lines as a new model for host interaction with hepatitis B virus. Sci. Rep. 6: 29358 (2016).
(6) Nishikori S, Takemoto K, Kamisuki S, Nakajima S, Kuramochi K, Tsukuda S, Iwamoto M, Katayama Y, Suzuki T, Kobayashi S, Watashi K, Sugawara F: Anti-hepatitis C Virus Natural Product from a Fungus, Penicillium herquei. J Nat Prod. 79: 442-6 (2016)
(5) Kaneko M, Watashi K, Kamisuki S, Matsunaga H, Iwamoto M, Kawai F, Ohashi H,  Tsukuda S, Shimura S, Suzuki R, Aizaki H, Sugiyama M, Park SY, Ito T, Ohtani N, Sugawara F, Tanaka Y, Mizokami M, Sureau C, Wakita T: A novel tricyclic polyketide, vanitaracin A, specifically inhibits the entry of hepatitis B and D viruses through targeting NTCP. J Virol. 89: 11945-53 (2015)
(4) Tsukuda S, Watashi K, Iwamoto M, Suzuki R, Aizaki H, Okada M, Sugiyama M, Kojima S, Tanaka Y, Mizokami M, Li J, Tong S, Wakita T.: Dysregulation of retinoic acid receptor diminishes hepatocyte permissiveness to hepatitis B virus infection through modulation of sodium taurocholate cotransporting polypeptide (NTCP) expression. J Biol Chem. 290: 5673-5684 (2015)
(3) Watashi K, Sluder A, Daito T, Matsunaga S, Ryo A, Nagamori S, Iwamoto M, Nakajima S, Tsukuda S, Borroto-Esoda K, Sugiyama M, Tanaka Y, Kanai Y, Kusuhara H, Mizokami M, Wakita T.: Cyclosporin A and its analogs inhibit hepatitis B virus entry into cultured hepatocytes through targeting a membrane transporter NTCP. Hepatology, 59: 1726-1737 (2014)
(2) Iwamoto M, Watashi K, Tsukuda S, Aly HH, Fukasawa M, Fujimoto A, Suzuki R, Aizaki H, Ito T, Koiwai O, Kusuhara H, Wakita T.: Evaluation and identification of hepatitis B virus entry inhibitors using HepG2 cells overexpressing a membrane transporter NTCP. Biochem Biophys Res Commun. 443: 808-813 (2014)
(1) Watashi K, Liang G, Iwamoto M, Marusawa H, Uchida N, Daito T, Kitamura K, Muramatsu M, Ohashi H, Kiyohara T, Suzuki R, Li J, Tong S, Tanaka Y, Murata K, Aizaki H, Wakita T.: Interleukin-1 and Tumor Necrosis Factor-α Trigger Restriction of Hepatitis B Virus Infection via a Cytidine Deaminase Activation-induced Cytidine Deaminase (AID). J Biol Chem. 288: 31715-31727 (2013)

Review

(2) Tsukuda S+, Iwamoto M+, Koichi Watashi : NTCP (sodium taurocholate cotransporting polypeptides). Encyclopedia of Signaling Molecules, 2nd Edition (2017). (+equally contribution)
(1) Iwamoto M and Watashi K: Closing the door on hepatitis B and D virus entry: what are our therapeutic options? . Future Virol. 11 (11): 715-718 (2016).

Kwangsu Kim

NAME

Kwangsu Kim

Email: kwangsu815[at]gmail.com
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CURRENT POSITION

Postdoctoral fellow, Department of Biology, Faculty of Science, Kyushu University

PUBLICATIONS

(5) Yong Dam Jeong, Kwang Su Kim and Il Hyo Jung, Optimal control strategies depending on interest level for the spread of rumor, Discrete Dynamics in Nature and Society, 2018, 04, 2018.
(4) Kwang Su Kim, Sangil Kim and Il Hyo Jung, Hopf bifurcation analysis and optimal control of Treatment in a delayed oncolytic virus dynamics. Mathematics and Computers in Simulation, 149, pp. 1-16, 02, 2018.
(3) Kwang Su Kim, Giphil Cho, Lin-Fei Nie and Il Hyo Jung, State-Dependent Impulsive Control Strategies for a Tumor-Immune Model. Discrete Dynamics in Nature and Society, 2016, 09, 2016.
(2) Kwang Su Kim, Sangil Kim, and Il Hyo Jung, Dynamics of tumor virotherapy: A deterministic and stochastic model approach. Stochastic Analysis and Applications, 34, 3, pp. 483-495 ,01, 2016.
(1) Kwang Su Kim, Giphil Cho, and Il Hyo Jung, Optimal treatment strategy for a tumor model under immune suppression. Computational and mathematical methods in medicine, 2014, 05, 2014.

Yusuke Kakizoe

NAME

Yusuke Kakizoe

Email: yusuke.purple5[at]gmail.com
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CURRENT POSITION

Visiting Assistant Professor, Department of Biology, Faculty of Science, Kyushu University

EDUCATION

  • B.S. Kyushu University, Japan, 2014 (Biology)
  • M.S. Kyushu University, Japan, 2016 (Mathematical Biology)

PUBLICATIONS

(5) S. Iwanami, Y. Kakizoe, S. Morita, T. Miura, S. Nakaoka and S. Iwami. “A highly pathogenic simian/human immunodeficiency virus effectively produces infectious virions compared with a less pathogenic virus in cell culture”, Theoretical Biology and Medical Modeling, 14:9, 2017
(4) Y. Kakizoe, S. Nakaoka, CA. Beauchemin, S. Morita, H. Mori, T. Igarashi, K. Aihara, T. Miura, and S. Iwami. “A method to determine the duration of the eclipse phase for in vitro infection with a highly pathogenic SHIV strain”, Scientific Reports. 5:10371, 2016
(3) Y. Kakizoe, and S. Iwami, “Exploring the conserved quantity of viral infection model with periodical cell removal”, Japan Journal of Industrial and Applied Mathematics, 32: pp1-9, 2015
(2) Y. Kakizoe, S. Morita, S. Nakaoka, Y. Takeuchi, K. Sato, T. Miura, CA. Beauchemin, and S. Iwami. “A conservation law for virus infection kinetics in vitro”, Journal of Theoretical Biology, 376:39-47,2015
(1) S. Iwami, Y. Koizumi Y, Ikeda H, and Kakizoe Y. “Quantification of viral infection dynamics in animal experiments”, Frontiers in Microbiology. 4:264, 2013

Nao Yamamoto

NAME

Nao Yamamoto

Email: nao.m.yamamoto[at]gmail.com
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CURRENT POSITION

Technical assistant, Department of Biology, Faculty of Science, Kyushu University

EDUCATION

  • B.S. University of British Columbia, 2015
  • M.S. Hokkaido University, Japan, 2019

PUBLICATIONS

(3) Nao Yamamoto, Hyojung Lee, Hiroshi Nishiura, Exploring the mechanisms behind the country-specific time of Zika virus importation, Mathematical Biosciences and Engineering - Accepted (2019).
(2) Yohei Sakamoto, Takayuki Yamaguchi, Nao Yamamoto, Hiroshi Nishiura, Modeling the elevated risk of yellow fever among travelers visiting Brazil, 2018, Theoretical Biology and Medical Modelling 15:9 (2018). DOI: 10.1186/s12976-018-0081-1
(1) Nao Yamamoto, Keisuke Ejima, Hiroshi Nishiura, Modelling the impact of correlation between condom use and sexual contact pattern on the dynamics of sexually transmitted infections, Theoretical Biology and Medical Modelling 15:6 (2018). DOI: 10.1186/s12976-018-0078-9

Masaaki Shimizu

NAME

Masaaki Shimizu

Email: shimy224[at]gmail.com
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CURRENT POSITION

Research student

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