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The purpose of this research is to obtain knowledge for effective use of Location Optimization Plan (LOP). Not many cities are actively trying to form a centralized urban structure.If the ratio of the area of the Dwelling Attraction Area (DAA) to the area of Urbanization Promotion Area is less than 70%, it is possible to maintain the population density within the DAA.Many cities do not have active guidance measures to induce DAA residence. However, in some cities, the DAA is narrowed and the residents are actively guided.Many cities try to maintain their living environment outside the DAA.

Satoshi SONODA-----＊ 1Yasushi NOZAWA-ーー ＊ 2 This study analyses the process of the conversion of low-unused land to public space. The analysis clarifies the significance of strategic process design for producing public spaces by chain reaction. It includes following things; 1) planner should place the project in the framework of urban design for the whole downtown, 2) project operator should cooperate with landowners and local companies, 3) neighborhood join the making process of public spaces, 4) project manager provides a variety of action programs for neighborhood. This study analyses the process of the conversion of low-unused land to public space. The analysis clarifies the significance of strategic process design for producing public spaces by chain reaction. It includes following things; 1) planner should place the project in the framework of urban design for the whole downtown, 2) project operator should cooperate with landowners and local companies, 3) neighborhood join the making process of public spaces, 4) project manager provides a variety of action programs for neighborhood.

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A general practice with the operation of otoshi ami, the most prevalent type of trap nets in this country, is to provide two units of the net, each one serving under water from 10 to 60 days after the other (Fig. 2). The procedure will be repeated all through the season so that the net fabrics may be protected from deterioration. However, a close obser vation would reveal that the strength of thread woven into the fishing net gradually declines with the lapse of time until reaching beyond a minimum of utility when the life of the net comes to an end. In this regard it should be reminded here that in case of synthetic fiber nets having gained prevalence, the threads presumably have not to be so strong as natural fiber threads, as the former is more durable than the latter. For that reason it is important for designing and operating a net to know the minimum strength of various net materials in c luding both natural and synthetic fibers.