In order to examine the effects of frequency and the wave form of cyclic stress on the strain sensitivity of biaxial stress measurement method using an electrodeposited copper foil with microcircular holes, pulsating tension tests are done to the stainless steel specimen glued the copper foil and recrystallized copper foil. The higher the frequency becomes, the lower the strain sensitivity becomes.And in the case of sine wave, the relationship between stress amplitude σ_ph0.5 corresponding to slip occurrence rate of 50% at the periphery of micro circular holes and the mean strain rate 4nσ_ph0.5/Eper one forth cycle, where n is the frequency expressed by Hertz and K is Young's modulus of the material stress measured, is expressed as σ_ph0.5=.4109 (4nσ_ph0.5/E) +B. So, σ_ph0.5 to optional frequency can be estimated by this equation. Also, the strain sensitivity is affected by wave form and it becomes highest in the case of square wave and becomes lower in ramp wave than sine wave. If the copper foil is recrystallized, the strain sensitivity increases but the effect of the difference of wave form decreases.

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After the Russo-Japanese War, Japan acquired the leasehold of the “Kanto Region”, which encouraged the process of fishery activities. This research discusses the fishery characteristics and the transformation of fishery structure in the Kanto Region focusing on the dragnet fishery in the 1920s –1930s. The research confirms the historical facts in the following three aspects: 1) the transformation of fishery structure in regulation and policy, number of households and persons, fishing-boat, amount and species of fish catch; 2) the transformation of the regulation and policy from promotion to restrict about the dragnet fishery; 3) expanded production of the dragnet fishery and promotion of the high horsepower management.

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This paper examines Japan-South Korea trade agreements in 1949 and 1950 as the beginning of political and economic relations between Japan and South Korea in the postwar period.
After losing in World War II, one of the most difficult challenges that Japanese diplomacy had to confront was the need to revise a vision of postwar Japan toward economic reconstruction. Japan had destroyed a friendly political and economic relationship with Northeast Asian countries because of its past colonial rule and military invasion. However, Japan needed to import a large amount of foodstuffs and raw materials, and export industrial goods as an important source of foreign exchange for recovering from the ruins of the war. Thus, Japanese elites began to regard it as natural that Japan would once again dominate trade with neighboring Asian countries.
This vision of Japanese elites was first realized as a part of the Cold War strategies of the United States. Washington believed that Japan should rebuild political and economic relations with the capitalist countries in Northeast Asia in order to strengthen its economy against communist influences. Toward that end, GHQ/SCAP concluded a trade agreement between Japan and South Korea in 1949, creating an import market for foodstuffs and raw materials for Japan, and establishing a market for Japanese exports.
As part of this strengthening push, Japanese elites took over American businesses. Because the agreement that the United States had concluded in 1949 was imperfect for them, the Japanese government tried to promote trading interests of the agreement in 1949, and to actualize the vision of Japanese elites revised. As a result, a new trade agreement signed by Japan and South Korea in 1950 facilitated a restored Japanese economic dominance over South Korea.
The South Korean government, however, was in direct opposition to the postwar Japan that Japanese elites had created and the United States government had recognized, because both trade agreements ignored Korean trade interests. Although Koreans needed the trade with Japan, it was very important for them to be freed from Japan's colonial rule and to depart from trade systems of the past.
The Korean War broke out immediately after the conclusion of the agreement in 1950. Japanese elites welcomed special procurements for the war, and Japanese exports to Korea increased considerably. This, however, was just the type of situation that the South Korean government was anxious to avoid. At the closing of the war's formal hostilities, South Korea's major trading partner shifted from Japan to the United States. Thus the Japanese people lost their first chance for normalizing relations with South Korea in postwar Northeast Asia.

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