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).

Yuuya Tachiki

NAME

Yuuya Tachki

Email: tachiki[at]bio-math10.biology.kyushu-u.ac.jp
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CURRENT POSITION

Program-Specific Researcher (JST CREST), Institute for Frontier Life and Medical Sciences, Kyoto University. Visiting Researcher, Faculty of Sciences, Kyushu University.

EDUCATION

  • B.S. Kyushu University, Japan, 2008 (Biology)
  • M.S. Graduate School for Systems Life Sciences, Kyushu University, Japan, 2010 (Mathematical Biology)
  • Ph.D Graduate School for Systems Life Sciences, Kyushu University, Japan, 2013 (Mathematical Biology)

PROFESSIONAL EXPERIENCE

  • Japan Society for the Promotion of Science for Young Scientists, DC1 (2010.4-2013.3)
  • Japan Society for the Promotion of Science for Young Scientists, PD (2013.4-2016.3)
  • Program-Specific Researcher (JST CREST), Institute for Frontier Life and Medical Sciences, Kyoto University. (2016.4 - current)

PUBLICATIONS

(11) *Yuuya Tachiki, Itsuro Koizumi. Absolute vs. relative assessments of individual status in status-dependent strategies under stochastic environments. The American Naturalist. The University of Chicago Press. 118(1) pp113-123. 2016.
(10) *Tomoyuki Abe, Yuuya Tachiki, Hirokazu Kon, Akiko Nagasaka, Kensuke Onodera, Kazuhiro Minamino, Qingmin Han, *Akiko Satake. Parameterization and validation of a resource budget model for masting using spatiotemporal flowering data of individual trees. Ecology Letters. Wiley-Blackwell. 19 pp1129-1139. 2016.
(9) *Yuuya Tachiki, Akiko Satake. Pair-approximation analyses of evolutionarily stable strategies for flowering time in clonal monocarpic plants. Japan Journal of Industrial and Applied Mathematics. Springer. 32(3) pp615-639 2015.
(8) *Yuuya Tachiki, Akifumi Makita, Yoshihisa Suyama, Akiko Satake. A spatially explicit model for flowering time in bamboos: long rhizomes drive the evolution of delayed flowering. Journal of Ecology. Wiley-Blackwell. 103(3) pp585-593 2015. [Harper Prize 2015受賞論文]
(7) *Yuuya Tachiki, Yoh Iwasa. Coevolution of mast seeding in trees and extended diapause of seed predators. Journal of Theoretical Biology. Elsevier. 339 pp129-139 2013.
(6) *Toyama H, Tagane S, Chhang P, Kajisa T, Ichihashi R, Samreth V, Ma V, Sokh H, Katayama A, Itadani H, Tateishi M, Tachiki Y, Mase K, Onoda Y, Mizoue N, Tachida H, Yahara T. Inventory of the woody flora in permanent plots of Kampong Thom and Kampong Chhnang Provinces, Cambodia. Acta Phytotaxonomica and Geobotanica.日本植物分類学会. 64(2) pp45-105 2013.
(5) †Yuya Fukano, *†Yuuya Tachiki, Tetsukazu Yahara, Yoh Iwasa. Soil disturbances can suppress the invasion of alien plants under plant-soil feedback. Ecological Modelling. Elsevier. 260 pp42-49 2013. †Equal contribution.
(4) *Yuuya Tachiki and Yoh Iwasa. Evolutionary jumping and breakthrough in tree masting evolution. Theoretical Population Biology. Elsevier. 81(1) pp20-31 2012.
(3) *Yuuya Tachiki and Yoh Iwasa. Both seedling banks and specialist seed predators promote the evolution of synchronized and intermittent reproduction (masting) in trees. Journal of Ecology. Wiley-Blackwell. 98(6) pp1398-1408 2010.
(2) *Yuuya Tachiki, Yoh Iwasa and Akiko Satake. Pollinator coupling can induce synchronized flowering in different plant species. Journal of Theoretical Biology. Elsevier. 267(2) pp153-163. 2010.
(1) Yuuya Tachiki and *Yoh Iwasa. Role of gap dynamics in the evolution of masting of trees. Evolutionary Ecology Research. Evolutionary Ecology, Ltd. 10(6) pp893-905. 2008.

Awards

(5) 10th Kataoka Award, The Society for the Study of Species Biology. 2016.
(4) Harper Prize 2015. British Ecological Society. 2016.
(3) 4th Suzuki Award (ESJ Encouraging Award). Ecological Society of Japan. 2016.
(2) Best Poster Award. 28th Annual Meeting of the Society of Population Ecology. 2012.
(1) Excellent Poster Award. 14th Annual Meeting of Society of Evolutionary Studies, Japan. 2012.

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