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Kumamoto-shi, Japan

32°48′N 130°43′E Kumamoto Gakuen University Called Gakuendai or Shōdai , it is a private Japanese university in Kumamoto, Japan. It was established in 1942, at which time Eastern Language Vocational College was subsumed into it. It was renamed Kumamoto Language Vocational College in 1945, and was made into Kumamoto Commerce University in 1954. It acquired its current name, Kumamoto Gakuen University, in 1994. At present, the university has 4 faculties with 11 departments.The university also has an affiliated senior high school, located immediately adjacent to the campus. While the high school is recognized as one of the best in the prefecture, the reputation of the university itself is as a second-rank institution. Wikipedia.

Miyoshi M.,University of Tokyo | Sumino H.,University of Tokyo | Miyabuchi Y.,Kumamoto University | Shinmura T.,Kumamoto Gakuen University | And 5 more authors.
Journal of Volcanology and Geothermal Research

We determined the K-Ar ages for post-caldera lavas from Aso volcano in central Kyushu, Japan using the unspiked sensitivity method. The following three peaks of highly-frequent volcanism are recognized in the post-caldera stage: 70-50. ka, 40-20. ka and later than 10. ka. The two peaks of 70-50. ka and 40-20. ka are characterized by activities of compositionally diverse magmas from basalt to rhyolite. The volumes of silicic magmas are significantly larger than those of basalt magmas in these peaks. On the other hand, the peak later than 10. ka is characterized by predominantly basaltic eruptions without silicic magma activities. The active center of the silicic magma production (=. crustal assimilation of injected basalt) had presumably migrated northeastward from the southwestern part of the caldera between the peaks of 70-50. ka and 40-20. ka. The predominant basaltic activity in the peak later than 10. ka represents that the production rate of silicic magma decreased, and does not indicate the accumulation of voluminous silicic magma beneath the recent Aso caldera. © 2012 Elsevier B.V. Source

Uno K.,Okayama University | Kaneshige Y.,Okayama University | Furukawa K.,Aichi University | Shinmura T.,Kumamoto Gakuen University | Miyoshi M.,University of Fukui
Earth, Planets and Space

Rhyolite is a common volcanic rock; however, few studies have focused on the remanent magnetization of rhyolite lava, and few paleomagnetic studies have successfully investigated rhyolite lavas. We suspect that problems associated with paleomagnetic studies of rhyolite may be due to the nearly ubiquitous flow structure in rhyolite lava. In this study, we examined a thick rhyolite lava flow with clearly marked flow structure to assess its ability to record a consistent paleomagnetic direction, using material penetrated by two drill cores. Progressive thermal demagnetization isolated two magnetization components. A high-temperature component from each of the two cores yields inclinations that differ from each other. The low-temperature component had those that agreed with each other, and were also consistent with the direction expected from a geocentric axial dipóle field. The modification of direction of the high-temperature component may be explained by post-magnetization acquisition tilting. The development of flow structure also leads to distortion of directions of the component, which is observed at stratigraphie positions where the volume fraction of light-colored parts of the flow structure >30%. In the case of silicic lava, the low-temperature component may retain directions parallel to the ambient field direction at the time of lava emplacement. © The Society of Geomagnetism and Earth Planetary and Space Sciences (SGEPSS). Source

Yorifuji T.,Okayama University of Science | Harada M.,Kumamoto Gakuen University
Environmental Health Perspectives

In "Adverse Effects of Methylmercury: Environmental Health Research Implications," Grandjean et al. (2010) reviewed the scientific discoveries of health risks resulting from methylmercury exposure, including the history of the Minamata disease incident. Although their title states "research implications," the authors failed to convey some important caveats from the incident. Source

Okuno M.,Fukuoka University | Shiihara M.,West Japan Engineering Consultants Inc. | Torii M.,Kumamoto Gakuen University | Nakamura T.,Nagoya University | And 4 more authors.

Ulleung Island, a large stratovolcano, is located in the western part of the Japan Sea (East Sea), 130 km off the eastern coast of the Korean Peninsula. The Ulleung-Oki (U-Oki) is a widely distributed tephra in and around the Japan Sea, and has an age of 10.7 cal ka BP obtained from the Lake Suigetsu data set (central Japan). Of the 7 tephra layers (U-7 to -1) on the island, the pumiceous U-4, U-3, and U-2 tephra layers are petrochemically and petrographically similar to the U-Oki tephra. To determine the eruption ages of 3 tephra layers on Ulleung Island, we conducted radiocarbon dating for 5 soil and 2 charcoal samples. Although the soil samples have the C/N ratios from 5 to 10, the obtained 14C dates are still consistent with the tephra stratigraphy of the island. The calibrated 14C dates for the U-4, U-3, and U-2 tephras are 11 cal ka BP, 8.3 or 9 cal ka BP, and 5.6 cal ka BP, respectively, indicating that the explosive eruptions occurred in the island with a time interval of 2000 to 3000 yr during the period of the early to middle Holocene. Based on our chronology, the U-4 tephra is most likely correlated with the U-Oki tephra. © 2010 by the Arizona Board of Regents on behalf of the University of Arizona. Source

Iitaka T.,Kumamoto Gakuen University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

This paper presents a recommendation engine I have developed for an online drill system. The engine provides suitable quizzes for users, helping users learn effectively. The paper describes the features and effects of the recommendation engine. © Springer International Publishing Switzerland 2015. Source

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