Research collaboration:
I am working Jointly with Prof.Dr. Kotaro Tanahashi and Prof.Dr. Atsushi, Uchiyama. We have already published two joint papers.
1. Prof.Dr. Kotaro Tanahashi
Department of Mathematics
Tohoku Pharmaceutical University
Sendai 981-8558
Japan
e-mail: tanahasi@tohoku-pharm.ac.jp
2. Prof.Dr. Atsushi, Uchiyama
Department of Mathematics
Sendai National College of Technology
Sendai, 989-3124
Japan
e-mail: uchiyama@cc.sendai-ct.ac.jp
See the papers: 
BullKoreanMath09_BJ05-05.pdf