1Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan,
2College of Agriculture and Forestry, Hue University, Hue 531940, Vietnam,
3Graduate School of Interdisciplinary Information Studies, The University of Tokyo, Tokyo 113-0033, Japan,
4College of Science, Hue University, Hue 530000, Vietnam
1Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan,
2College of Agriculture and Forestry, Hue University, Hue 531940, Vietnam,
3Graduate School of Interdisciplinary Information Studies, The University of Tokyo, Tokyo 113-0033, Japan,
4College of Science, Hue University, Hue 530000, Vietnam
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Corresponding author:
Hidetoshi Morita , Tel: +81-86-2518343;,
Received: 7 June 2018 • Revised: 4 July 2018 • Accepted: 4 July 2018