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2007년 세계전파통신회의 제2차 준비회의(CPM07-2)
이성학,최선혜,Lee, Seong-Hak,Choe, Seon-Hye 한국정보통신기술협회 2007 TTA저널 Vol.110 No.-
2007년 세계전파통신회의(WRC)를 효율적으로 준비하기 위하여 CPM-07 제2차 회의가 2007년 2월 19일부터 3월 2일까지 스위스 제네바에서 개최되었다. 이번 회의에서는 각국 주관청이 모여 WRC-07 28개 의제에 대한 의견을 사전 조율하고, WRC-07 본회의에 상정할 CPM-07 최종 보고서 내용을 합의하였다. 본 원고는 이번 CPM-07 제2차 회의 결과를 주요 의제별로 요약 정리한 것이다.
Al-Si 계 주조복합재료의 진동감쇠능에 미치는 강화입자의 영향
이성학(Sung Hak Lee),이동근(Dong Geun Lee),고성현(Seong Hyun Ko),김석수(Suk Soo Kim) 대한금속재료학회 ( 구 대한금속학회 ) 2002 대한금속·재료학회지 Vol.40 No.9
The present study was concerned with the effects of reinforcements on damping capacity in cast Al-Si composites. Bending vibration tests were conducted on A356 alloy, Al-SiCp composites, and Al-SiCp-C composites using impulse-frequency response techniques, and their damping capacity and elastic modulus were evaluated. The test results indicated that the damping capacity was increased in the order of the A356 alloy, Al-SiCp composites, and Al-SiCp-C composites. Particularly in the Al-SiCp-C composites, the addition of 4 vol.% graphites was very effective on the enhancement of damping capacity, while SiC particulates contributed to the improvement of hardness and strength. The elastic moduli calculated from the Euler-Bernoulli beam theory for the A356 alloy and the composites were matched well with the measured moduli within the error range of 3~7%.
韓國 行政區域의 名號에 關한 歷史地理學的 硏究 : 「京」과「府」의 境過 a case of "Gyeong"(京) and "Bu"(府)
李聖學 慶北大學校 1981 論文集 Vol.31 No.-
1) The term "Gyeong"(京) had teen used an administrative district in Ko-Ryo(高麗) dynasty. It meant capital city and sometimes indicateed important administrative district. O-so Gyeong(五小京) in Silla(新羅) and Sam Gyeong Tae(三京制) in Ko-Ryo(高麗) dynasty took after the administrative system of Dang(唐) dynasty. The "Gyeong"(京) system have implied special administrative districts weing equivalent to Royal seet. 2) The name "Bu"(府) had been called since Ko-Ryo(高麗) dynasty, and the name, probably, was originated from China. In the beginning of period of Ko-Ryo(高麗) dynasty, "Bu"(府) refered to Royal seat, such as "Ke-Seong Bu"(開城府) as well as important districts such as "An-Dong Bu"(安東府) and "Ui-Seong Bu"(義城府). To became "Bu"(府) in that period, is mainly due to two reasons. 3) To become "Bu"(府) in that period, is mainly due to two associations: one is given the name of "Bu"(府) to the birth place of surrended generals, and the other is given-to yeoman. However, "Bu"(府) was geneally named an ordinary administrative district since King 'Seong- Jong'(成宗). 4) In Yi(李) dynasty, there were two Kinds of "Bu"(府) : one "Bu"(府) was ocupied by "Yu-Su-Bu"(留守府) who was from the central gevernment. The other "Bu"(府) was charged by "Bu-Sa"(府使) who is responsible for local district. These system were disappeared at ending period of King Ko-Jong(高宗), and were replace for 23 "Bu"(府) which is equivalent to "Do"(道). The 23 "Bu"(府) were soon disappeared. Since "the treaty of Eol-Sa(乙巳) safeguard" Yi(李) dynasty set up 12 "Bu"(府). Those "Bu"(府) were conceded with area which many Japanese inhabited. 5) Contemporarily, in administrative system of Japan, "Bu"(府) is the level as "Hyeon"(縣), and in Korea, "Bu"(府) system do nat exist any more.
李聖學 慶北大學校 1982 論文集 Vol.33 No.-
1) At the age of "Han-Sa Gun"(漢四郡), the "Gun"(郡) system had "Hyun"(縣) in its area. But, after the "Sam-Guk6(三國) age, "Gun" and "Hyun" had its own province, ie, it had its originality. 2) The ascent and descent of the name of "Gun"(郡) was mainly due to the reasous of the king's household, a meritorious retainer, a rebellious subject and a criminals, etc. 3) However, Nowodeuys "Gun"(郡) system is based on the reorganization of an administrative district at the age of Japan-empire. At that time, the whole country was divided into 13 provinces and 220 "Gun"s under them.