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Schwarzschild-Harrison 시공간의 GEMS 끼워넣기
김승국 한국물리학회 2017 새물리 Vol.67 No.4
In this paper, we study the global embedded Minkowski spacetime (GEMS) of the Schwarzschild-Harrison spacetime obtained from the Harrison transformation to the Schwarzschild spacetime, which has the AdS$_2$ $\times$ S$^2$ structure as does the Bertotti-Robinson spacetime. The results show that the Schwarzschild-Harrison spacetime can be embedded in a (5+2)-dimensional flat spacetime and prove that the Unruh effect in the (5+2)-dimensional flat spacetime is equivalent to the Hawking effect in the (3+1)-dimensional original curved spacetime. We also find that compared to the Hawking temperature which is divengent at the event horizon, the local free-fall temperature in the Schwarzschild-Harrison spacetime seen by a freely-falling observer is finite. 본 논문에서는 Schwarzschild 블랙홀 해를 Bertotti-Robinson 시공간의 대표적 형태의 하나인 AdS$_2$ $\times$ S$^2$ 타입의 구조를 갖도록 Harrison 변환시킨 Schwarzschild-Harrison 시공간에 대해 Minkowski 시공간으로의 대역적 끼워넣기 (GEMS)에 관해서 연구하였다. 이를 통해 4차원의 굽은 Schwarzschild-Harrison 시공간은 (5+2) 차원의 편평한 시공간으로 GEMS 끼워넣기가 가능함을 보였고, 이렇게 끼워넣어진 (5+2) 차원의 편평한 시공간에서 얻은 Unruh 효과는 4차원 Schwarzschild-Harrison 시공간에서의 Hawking 효과와 같다는 사실을 증명하였다. 나아가 굽은 시공간에서의 Hawking 온도는 사상의 지평면에서 발산하는데 반해, 이 Schwarzschild-Harrison 시공간에서 자유낙하하는 관측자가 본 블랙홀의 온도는 유한한 값을 가짐을 보였다.
김승국,지연상 광주보건대학 2002 論文集 Vol.27 No.-
This paper is based on the records of researching the patients with cancer in the Chunnam National University Hospital from January 1996 to December 2000 and referred to records of the Headquarters of Korea Central Cancer Registory, Ministry of Health and Welfare, Republic of Korea and National Cancer Center. The results are as the following: 1. Among the total O.P.D 4,246,293 the patients of therapeutic radiology are 136,324 in 3.21% 2. Among the 9,329 cancer patients, stomach cancer patients are 1,480(15.86%), liver cancer patients are 1,227(13.15%), lung cancer patients are 1,079(11.57%). Sexual ratio of male to female appeared 1.45:1. Therefore, male cancer patients are more than female patients. 3. The age distribution of cancer was 2,968(31.81%) by 55∼64 age, 2,172(23.28%) by 65∼74 age, and 1,715(18.38%) by 45∼54age. Therefore, above the 70% of all cancer patients were 45∼75 ages. 4. Among the 9,815 therapeutic radiology patients, 1,755(17.89%) are in the uterus system, 2,772(23.7%)are in the head and neck, 1,519(15.48%) are in the lung. Therefore, the proportion of three kinds of therapeutic radiology patients is about 50%. 5. The occupational distribution of 9,329 cancer patients(95∼2000 year) are 2,181(23.28%) by house wives, 2,165(23.21%) by orderly farmers, 380(4.07%) by businessmen, and 314(3.37%) by salary men. Miners, forest men and soldiers didn't nearly appear. 6. The number of patients of cancer diagnosis 6,862(73.56%) was by the biopsy of primary region, and 1,842(19.74%) by clinical examination. Therefore, those two kinds of methods took a proportion of about 94%. From 1996, the number of deceases in GI, PD has been increasing continuously. The total number in GI was 57(28.64%), in PD was 54(27.14%), and in GS was 11(5.53%). Therefore, those three kinds of deceases took a proportion of about 60%.
이주 노동자의 직무만족에 영향을 미치는 요인에 관한연구
김승국,오가영 강원대학교 경영경제연구소 2023 Asia-Pacific Journal of Business Vol.14 No.1
Purpose - This study is a study on the factors affecting job satisfaction of foreign migrant workers (focusing on domestic automobile industry workers) to examine the impact of foreign workers on the corporate management of Korean manufacturers in Korean society. Design/methodology/approach - A survey was conducted on 152 foreign laborers who lived in Korea. First, an exploratory factor analysis was performed to confirm reliability and validity. Second, an multiple regression was conducted based on the reliability and exploratory factor analysis results. Third, the mediation regression by checking the effect of organizational commitment. Findings - The acculturation and organizational fairness were found to have a great influence on job satisfaction, and this study found that perceived acculturation had an effect on job satisfaction through the mediating effect of organizational commitment. In addition, organizational fairness was also found to have an effect on job satisfaction as a mediating effect of organizational commitment. Research implications or Originality - It was to provide meaningful implications for foreign workers in the current Korean labor market. Based on the results, the corporate competitiveness of Korean manufacturers should be further secured.