著者

Shinji Suzuki Nobuo Tsurusaki Yoshinori Kodama

出版者

Arachnological Society of Japan

雑誌

Acta Arachnologica (ISSN:00015202)

巻号頁・発行日

vol.55, no.2, pp.79-86, 2006 (Released:2007-04-10)

参考文献数

28

被引用文献数

2 5

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We surveyed habitats of an endangered burrowing wolf spider Lycosa ishikariana (Saito 1934) along the San'in coast of Tottori and Shimane Prefectures, southwestern Honshu, Japan. The species was found from eight sites covering seven different beaches from Inasa Beach (Izumo City) in the east to Toda Beach (Masuda City) in the west in Shimane Prefecture for the first time. This extends the southwestern limit of the species' range ca. 160 km westward from the Yumigahama Beach of Tottori Prefecture, the present southernmost record. In the coast of Tottori Prefecture, the species was found from 17 sites that exceed known number of records in the area. The apparent increase of the number of habitats of the species in Tottori Prefecture is probably due to a shift of survey season from the mid summer to June when density of the burrows culminates by the recruit of newly hatched spiderlings. Simple logistic regression analyses suggested that presence/absence of the species is related to any of the sand grain sizes, sorting indices, areas, lengths and maximum widths of the sandy beaches, though a multiple logistic regression analysis revealed that beach areas and sand grain size were the most significant factors. According to the models obtained, requirements for the occurrence of species were estimated to be areas>0.0313 km2 (total length>985 m, width>60 m) of sandy beach, and sand grain diameter>0.33 mm.

著者

Masako OKANO Masahiko ISSHIKI Shinji SUZUKI

出版者

Japanese Society for Engineering Education

雑誌

Journal of JSEE (ISSN:13412167)

巻号頁・発行日

vol.60, no.6, pp.6_68-6_73, 2012 (Released:2012-12-06)

参考文献数

6

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The aviation industry, which is faced with a fierce global competition, is expected to become one of the major industries in Japan. Thus, students who major in aeronautics are required to obtain not only a wide range of knowledge but also practical skills in order to play an active role in the aviation segments. To this end, Department of Aeronautics and Astronautics of the University of Tokyo started a new program that introduced a business simulation and the negotiation theory to aeronautics education. This paper discusses the details of the program, its purpose and results, as well as the future works.