This paper proposes an identification method for PERT arrow-diagram, which is niost simplified network model. An example is also given where the proposed method was applied in the designing a warehouse system.

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Through the analysis of observed data obtained by the Ago Bay Project, it has been recognized the relation between the intrusion of seawater from outer sea and the movement of the oxygen depleted water mass pooled in the bay head, where the large amount of cultivation of pearl oysters is performed. Forecasting the movement of the oxygen depleted water mass is very beneficial for the industry, and possible, if the intrusion of sea water is detected rather before its arrival to the bay head. Based on this idea, the current velocity data recorded by the ADCP (Acoustic Doppler Current Profiler) set-up on the seabed at the center of Ago Bay was investigated. The analysis shows the high correlation between the volume-flux just above the ADCP and the total volume-flux through the transverse cross-section of the central bay. It also shows that the increment of salinity in the bottom layer at the central bay follows the increment of the eastward volume-flux of the bottom layer. The eastward flux corresponds that towards the bay head. These facts suggest the availability of the use of ADCP data for the detection of intrusion. The present ADCP system is offline and the data is retrieved once two months. The establishment of the online system is required for realization of forecasting.

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Kamuito-numa (45° 14'N, 140° 13')is at an altitude of 5m above sea level, with a maximum depth of 6.8m and a mean depth of 3.5m. Diatom assemblages were collected from the core material of Kamuito-numa, in August 2004, and a total of 148 taxa from 28 genera were recorded. The dominant taxa and subdominant taxa were Aulacoseira sp. 1 (28.7%) and Tabellaria fenestrata (21.0%)in the sediments.

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Two new species of Genus Macrothrix (Macrothrix mikawaensis sp. nov. and Macrothrix hidaensis sp. nov)and one new species of Genus Simocephalus (Simocephalus japonica sp. nov) were discovered in the paddy field of Japan.

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Distance education has become an important aspect of the education systems of many countries including the USA, Australia, Thailand etc.. Distance education allows greater access to education for those people separated from schools by physical distance, as well as those whose work, family life and lifestyles make it difficult for them to attend schools. There are many problems and challenges with this unique form of educational delivery. This paper explores three important areas in relation to distance education, 1) constructivist learning theories, 2) faculty issues, and 3) the role of culture in online distance education.

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"Culture" is a complex that consists of life way formed and knowledge gotten by human beings while concerning with their environment. The essential attributes of culture are universality, society (community), diachronic and patrimony. The most difference between human beings and animals is that human beings has culture, their two legs erect and walk. With evolving of human beings foot, shoes were invented. Moreover, foot and shoes became fashionable, have come to emblem. For example, foot binding in the history of China and high heels at the present. Neither the foot binding nor high heels is bad for health, therefore abolition movements of them happened in the history, but frustrated. The root cause is in the essential attributes of culture.

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