절연지는 운전 중 열, 산소 및 수분의 영향에 의해 시간 경과와 함께 셀룰로오스 분자 결합이 절단되어 강도가 저하되고 그 과정에서 푸르푸랄, 일산화탄소, 이산화탄소 등 노화 생성물이 생겨 절연유 속에 용해된다. 절연유도 운전 중에 발생하는 열, 탄소, 수분의 노화와 함께 도체가 촉매가 되고 노화
Depressed industry
3~4% of annual growth was expected
Shrinking demand due to economic crisis
Trends: Industrial Combination
Market dichotomy
China, CIS countries, Central & South America: Mass market at low price
Japan, EU, etc: High-end goods at high price
Dependence on importing
Structural problem of Korean firms
Price of imported raw material has been
increasing
step of the Korean government’s plan to develop the country and foster heavy industries.
The construction of the first manufacturing facilities and furnaces was completed in 1973 and the production was started. After 1970’s, which was the most rapid growth period of Korean economy, POSCO also experienced enormous growth as well. Another epoch-making chance was a privatization. Before then,
04. The incidence of failure following single-visit endodontic therapy
Richard B.Pekruhn. J Endod 12:68-72. 1986
Introduction
- Single-visit 근관 치료와 multiple-visit 근관 치료사이의 실패율 유의차 없음
- Single-visit 근관 치료는 다음 세 가지로 분류
① 초기접근, 근관 형성, 근관충전이 single-visit 근관 치료로 완료
② 통증
Rationale for the tool selection of government corporations
A government corporation is likely to be an appropriate tool of government to carry out programs that are of a business nature, revenue producing and potentially self-sustaining; involve a large number of business-type transactions with the public, and require a greater flexibility than the customary type of appropriations budget ord