Profile

• Name : Leun. D. Kim (or Donghyun Kim)
• Sex : Male
• Blood Type : Type O
• Hobby : Music, Travel, Photos
• E-mail : kdh743 (at) gmail.com
• Blog : http://www.leunkim.com

Education

• The University of Tokyo, Ph. D, Mathematical Science, 2016 – .
• Osaka University, Master of Science (MS), Mathematics, 2012 – 2014.
• Sogang University, Bachelor of Science (BS), Mathematics, 2009 – 2012.
• Sogang University, Bachelor of Science in Electrical Engineering (BSEE), 2007 – 2012.

I am interested in the nonlinear partial differential equations, especially hyperbolic-type such as wave equations or Klein-Gordon equations. A list of courses which I have taken can be found Here .

Papers

• Donghyun Kim, A note on decay rates of solutions to a system of cubic nonlinear Schrödinger equations in one space dimension, Asymptotic Analysis 98 (May 2016), 79-90 (arXiv: 1408.6464).
• Donghyun Kim, A note on a system of cubic nonlinear Klein-Gordon equations in one space dimension, Differential Equations and Dynamical Systems (2016), 00-00 (arXiv: 1407.6658).
• Donghyun Kim, Global existence of small amplitude solutions to one-dimensional nonlinear Klein-Gordon systems with different masses, J. Hyper. Differential Equations 12 (December 2015), 745-762 (arXiv: 1406.3947).
• Donghyun Kim and Hideaki Sunagawa, Remarks on decay of small solutions to systems of Klein-Gordon equations with dissipative nonlinearities, Nonlinear Analysis 97 (March 2014), 94-105 (arXiv: 1307.7890).
• Donghyun Kim, Decay of solutions to systems of Klein-Gordon equations with dissipative nonlinearities, Master Thesis, Osaka University (February 2014).

Talks

• 若手研究者による実解析と偏微分方程式 2013 ,
  Osaka University, Osaka, Japan (November 30, 2013).

Honors and Awards

• Osaka University MiraiKikin, Graduate School of Science Scholarship, 2013–2014.
• Osaka University MiraiKikin, Graduate School of Science Scholarship, 2012–2013.
• Sogang University, Honors Scholarship (AA), 2011.
• Sogang University, Honors Scholarship (A), 2010.

Experience

• Hankuk University of Foreign Studies, Public Service Worker, Sep. 2015 – Mar. 2016.
• Seoul National Science Museum, Public Service Worker, Mar. 2014 – Sep. 2015.
• Teaching Assistant (Calculus B), Osaka University, Japan, Oct. 2013 – Feb. 2014.
• Teaching Assistant (Calculus A), Osaka University, Japan, Apr. 2013 – Aug. 2013.

Activities in Music

• Keyboardist in Band ‘Aramir’ (2007. 5 ~ 2008. 12)
  • Concert in Club CJHR (2007. 8)
  • Participation in Sogang University Festival (2008. 10)
  • Concert in Live Club SPOT (2008. 12)
• Keyboardist in Melodic Speed Metal Band ‘Antimatter’ (2008. 8 ~ 2009. 3)
  • Festival in Sangmoon High School (2008. 10)
  • Festival ‘Diving Goolby’ in Seoul National University (2008)
• Keyboardist in Melodic Speed Metal Band ‘Lucifer Effect’ (2009. 3 ~ 2011. 12)
  • Concert in Club Rolling Stones in Sinchon (2009. 7)
  • Concert in Club DGBD in HongDae (with Mutant and D.Cay) (2010. 6)
  • Concert in Queen Live Hall (2011. 9)

We could have completely covered some melodic speed metal songs, for example, Dragonland – The Neverending Story, Stratovarius – Eagle Heart, Kamelot – Forever, Revolution Reneissance – Last Night on Earth, Iron Maidon – Fear of the Dark, Sonata Arctica – My Land, 어둠 – 수묵화, Gamma Ray – Heaven can wait, 403 – Southern Cross, Black Sabbath – Heaven and Hell, Sonata Arctica – Full Moon, Broken, Helloween – Before the War, Helloween – A Tale that wasn’t Right, Stratovarius – Stratosphere, Rhapsody – Emerald Sword and so on. Also we have composed songs in this style, for example, “Running bi-car” and so on.

• Kinosaki Onsen (2014. 3)
• Okinawa (2014. 3)
• Whole Japan (2009. 8) : Fukuoka, Hiroshima, Osaka, Kobe, Tokyo, Hachinohe, Aomori, Hakodate, Sapporo.
• Hongkong (2006. 12)
• Western Europe (2004. 12)
• Tokyo, Japan (2006. 12)
• Chingdao, China (2007. 7)
• Whole South Korea (2007. 9)
• Beijing, China (2007. 7)

click to enlarge!

Kyung-Buk High School, Daegu (Fall, 2006)

Suseung-gu Office Station (Winter, 2006)

Repulse Bay, Hongkong (Winter, 2006)

A Bar in Busan (Spring, 2007)

Seven-Eleven Store, Mapo, Seoul (Spring, 2008)

Mapo, Seoul (Summer, 2008)

Chung-Ang Univ., Seoul (Summer, 2008)

Diving Gulby at SNU, Seoul (Fall, 2008)

Ihwa Womens Univ., Seoul (Fall, 2008)

Sinchon, Seoul (Fall, 2008)

People Sound Studio, Seoul (Winter, 2008)

Concert at Hongdae, Seoul (Summer, 2009)

Hongdae, Seoul (Summer, 2009)

With my family in Chilgok (Summer, 2009)

Fukuoka (Summer, 2009)

At the Museum of Hokkaido University, Sapporo (Summer, 2009)

A Bar at Chungmu-ro, Seoul (Summer, 2009)

Feel Sound Studio, Seoul (Summer, 2009)

Kyodae Stn., Seoul (Fall, 2009)

Doosan Weve, Suseung-gu, Daegu (Summer, 2010)

Doosan Weve, Suseung-gu, Daegu (Summer, 2010)

Hanul Park, Sangam-dong, Mapo, Seoul (Summer, 2010)

Hanul Park, Sangam-dong, Mapo, Seoul (Summer, 2010)

A Subway Stn. (Bangbae?) (Fall, 2010)

Feel Sound Studio, Bangbae, Seoul (Fall, 2010)

Feel Sound, Bangbae, Seoul (Winter, 2010)

My room, Sangam-dong, Mapo-gu, Seoul (Summer 2011)

In Daegu (Fall, 2011)

A cafe in Seoul
(Winter, 2011)

A Cafe in Daegu (Summer, 2012)

Daegu World Cup Stadium (Summer, 2012)

Gangnam Station, Seoul (Summer, 2012)

Seven Monky Cafe, Daegu (Summer 2012)

Centum City, Busan (Summer, 2013)

Kiyomizu-dera, Kyoto (Winter 2013)

Kurama Temple, Kyoto (Winter, 2014)

Kurama Temple, Kyoto (Winter, 2014)

At Maruyama Park, Kyoto (Winter 2014)

Kinosaki-Onsen (Winter 2014)

Fukushu-in, Okinawa (Winter, 2014)

Waiting for a bus at Minoh City Hall, Osaka, Japan (Feb. 2013)

with high school friends, Myeongdong, Seoul (Spring, 2014)

In Pangyo (March, 2015)

At Dream Forest (July, 2015)

In Samchung-dong (August, 2015)