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정태신,전중환,이승훈,이영국,최종술 ( Tae Shin Chung,Joong Hwan Jun,Seung Hoon Lee,Young Kook Lee,Chong Sool Choi ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.2
N/A Degradation and recovery of damping capacity in a Cu-65%Mn alloy have been studied. When the alloy was isothermally aged at 400℃, the highest damping capacity was observed after aging for 4 hours. In case when the alloy aged at 400℃ for 4 hours was maintained at 100℃, the damping capacity gradually decreased with time. The microstructural observations showed that the formation of subdomains and α-Mn precipitates are responsible for the degradation of damping capacity. When the degraded specimen was reheated at 250℃ for 30 minutes, the damping capacity was recovered considerably owing to the redistribution of impurity atoms, the extinction of subdomains and the release of damping sources from α-Mn precipitates during the repeated transformation, fcc↔fct.
정태만(鄭泰萬) 한국일본문화학회 2017 日本文化學報 Vol.0 No.72
In interpreting treaties, the interpretation in accordance with the ordinary meaning of the terms of the treaty in their context is a fundamental principle, which is also specified in the Vienna Convention on the Law of Treaties. In this paper, each of the terms in Article 2 (a) of the San Francisco Peace Treaty is interpreted in accordance with its ordinary meaning, and made clear to which country the Dokdo"s sovereignty belongs. The emphasis is on the ordinary meaning of ‘Korea’, because Japan is required to renounce all right, title and claim to Korea. Not only by SCAPIN 677 of Contracting States, the Allied Powers, but also by Ministry of Finance"s Decree No. 4(1951.2.13) and Prime Minister"s Decree No. 24(1951.6.6) of the other Contracting State, Japan, "Korea" means Korea including Dokdo. These are also visually proven by the "SCAP Administrative Areas: Japan and South Korea" of February 1946 and the "The Japanese Domain Reference Map"(日本領域参考図) of August 1951 respectively. In addition, I argue that criticisms are common in the previous studies of Korean scholars as well as Japanese scholars in the interpretation of Article 2 (a) of the San Francisco Peace Treaty on the terms such as "recognizing the independence" and "including".
Cu-55%Mn 합금의 진동감쇠능에 미치는 각종 열처리의 영향
정태신,전중환,이영국,최종술 ( Tae Shin Chung,Joong Hwan Jun,Young Kook Lee,Chong Sool Choi ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.1
Effects of different heat treatments on microstructure and damping capacity of Cu-55%Mn alloy were investigated to find an optimum heat treatment condition for a maximum damping capacity. The alloy showed the high level of damping capacity in case of the aging at 375 and 400℃. This is ascribed to the FCC→FCT martensitic transformation and microstructural changes from mottled to tweed band type. The damping capacity had a maximum value of 0.33 in logarithmic decrement when the alloy was aged at 375℃ for 14 hours followed by 20 times of thermal cycling between room temperature and 250℃. The refinement of tweed structure by thermal cycling is thought to be responsible for the highest damping capacity.