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송명구,강효식 인제대학교 1986 仁濟醫學 Vol.7 No.1
구강 내에는 많은 종류의 치계 낭종이 발생하고 있다. 이중 치성각화낭종은 10%정도를 차지한다. 저자는 1980년부터 1984년까지 만 5년간 치성각화낭종으로 판명된 49예의 연령 및 성별 분포 부위별 발생 상황, 재발율 등을 임상병리학적으로 분석 평가하였다. 이들의 재발율은 전체 환자의 12.2%로서 다른 치계 낭종에 비해 월등히 높은 수치를 보였다. 따라서 치성각화낭종의 경우에는 재발율을 감소시키기 위하여, 채택된 수술 방법이 매우 중요한 것으로 제시되었다. 이러한 결과는 향후 치성각화 낭종의 관리에 참고가 될 것으로 기대되어 문헌적 고찰과 함께 보고하는 바이다. The author has reviewed, clinically and histopathologically, 49 cases of odontogenic keratocysts which were collected at the dept. of dentistry, Inje Medical College, Paik Hospital, Seoul and the infirmary of dental school, SNU, for 5 years. (Jan. 1, 1980 - Dec. 31, 1984) The results were as follows 1.On the sex predilection, male was 59.271 (29 cases), female was 40.8% (20 cases). The ratio of male to female was 1.5:1. The peak incidence was in second decade (17 cases) and average age was 31.8 years old. 2.13 cases (26.5%) occurred in the maxilla and 36 cases (73.5%) occurred in the mandible, especially in the molar and ascending ramps area. 3.Recurrence rate was 12.2%. 4.There were no characteristics radiologically.
송명구(Song Myoung Koo),민병일(Byong Il Min) 대한구강악안면외과학회 1985 대한구강악안면외과학회지 Vol.11 No.2
Numerous papers on epithelial jaw cysts have appeared in the decade since the publication in 1971 of the WHO histological calcification of odontogenic tumors, jaw cysts, and allied lesions. There have been considerable advances in our understanding of the origin, growth, clinical and radiological presentation, pathology and treatment of these lesions. There are, nevertheless, many controversial topics in this field of study. In 1981, J. J. Pindborg commented new classification with minor modification on the previous one. So, according to new classification, in order to study on the predilection, the tendency, the clinical feature in age, sex and location of the odontogenic cysts by the analysis of the biopsy cases, the another has invested, clinically and histopathologically, 371 cases of odontogenic cysts which were collected at the infirmary of dental school, SNU, for 5 years (JAN. 1, 1980-Dec. 31, 1984). The results were as following. 1. The radicular cyst showed the most frequent occurrence of 166 cases (44.74%). The followings were 84 cases (22.64%) of dentigerous cysts; residual cyst, 42 cases (11.32%); odontogenic keratocyst, 32 cases (8.66%); lateral periodontal cyst, 13 cases (3.50%), calcifying odontogenic cyst, 6 cases (1.62%); and 3 cases (0.8%) of eruption cyst. 2. On the sex predilection, male was 57.4% (213 cases) and female 42.6% (158 cases). The rate of male to female was 1.35:1. 3. The age distribution revealed the highest occurrence of 23.1% (86 cases) at 21-30 years. The average age of male was 32.6% years, female was 33.7, and the average of both sexes on 371 cases was 33.1. 4. 215 cases (58%) occurred in the maxilla and 156 (42%) in the mandible. The maxillary anterior segment and the mandibular posterior segment had more cysts. 5. There was no characteristic change in the occurrence of cysts annually. 6. Besides odontogenic keratocysts and calcifying odontogenic cysts, there were keratinizations in 8 cases of dentigerous cysts, 3 cases in radicular cysts, and 2 cases in residual cysts. Ciliated columnar epitheliums were found in 6 cases of dentigerous cysts, 1 case in calcifying odontogenic cyst, 7 cases in radicular cysts, and 6 cases in residual cysts. All were in the maxilla.
송명구(Song Myungkoo),안소현,이임자,박상수,양주영 산업연구원 2021 연구보고서 Vol.- No.-
The structure of international trade has become one of the determinants of the competitiveness of manufacturing industries as globalization has progressed. Internationally-connected networks provide benefits to consumers and firms through comparative advantage. However, an unprecedented shock such as the COVID-19 and international trade disputes exemplified by the US-China trade have highlighted the shortcomings of internationally-connected networks. These changes in the global economic environment have led several countries to reshape their international economic policies. Considering the trends in trade reform, it has become crucial to assess the impact of import structure on industry competitiveness. This paper studies the impact of import competition on firm profitability measured by price-cost margins in manufacturing firms in South Korea. Based on firm-level data from ten major manufacturing industries, we find that import penetration itself does not have a significant effect on firms price-cost margins. However, decomposing import penetration leads to different outcomes. Import penetration from low wage countries has a negative impact on firm profitability, which is statistically significant. On the other hand, exposure to imports from high-wage countries affects the price-cost margin not only significantly but also positively. In addition, the degree and statistical significance of the effects varies by firm size. These results imply that there is a notable difference in participating market depending on firm size. Specifically, smaller(larger) companies tend to compete in markets where products originate predominantly from low-wage(highwage) countries. Moreover, import penetration in upstream sectors meaningfully affects the share of the cost of raw material in the total output of its downstream industries. These results suggest that policymakers need to consider exposure to trade when evaluating or establishing policies to enhance industrial competitiveness. Monitoring and constantly updating the current status of global value chains and the composition of domestic industry will also help the government to timely and effectively deal with international geopolitical issues.