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로켓엔진 고공모사용 초음속디퓨저 시동 및 종료 특성과 냉각 효과에 대한 연구
김태령(Tae-Ryung Kim),박병용(Byung-Yong Park),김승한(Seung-Han Kim),한영민(Yeoung-Min Han) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
한국형발사체 2단 엔진 고공모사용 초음속디퓨저의 형상설계와 성능예측에 대한 연구를 진행하였다. 초음속 디퓨저는 1차원 이론적 계산 결과를 근거로 설계되었으며 초음속 디퓨저의 냉각을 위한 내부물분사가 고려되어 3차원 수치해석 결과로 효과가 확인되었다. 설계된 초음속 디퓨저의 형상이 엔진목표고도에 부합됨을 확인하였으며, 디퓨저 내부 물분사가 고공 모사 성능 및 디퓨저 내부 가열에 미치는 영향이 분석되었다. The purpose of this numerical analysis is to predict the aerodynamic profile and performance of thesupersonic diffuser for the altitude test of KSLV-Ⅱ second stage engine. The supersonic diffuser wasdesigned based on 1D code calculation by using theoretical formula and was confirmed by the 3Dnumerical analysis that is considered with the water spray system. This analysis was confirmed to becorrespond with the required altitude of the engine and was developed to analyze the effect of thewater spray system of supersonic diffuser that affects the altitude performance and the internal heatflux.
서문기(Moon Gi-Suh),김태령(Tae-Ryung Kim) 숭실대학교 사회과학연구소 2010 사회과학논총 Vol.12 No.-
IT 발전에 관한 기존의 연구들이 각국에 내재한 경제적·사회문화적·정치적 요인을 격차의 원인으로 강조하는 데 비해 이 글은 세계체제론의 분석틀을 통해 국제지형에서 IT 발전의 인과관계를 바라볼 것을 제시한다. 이를 위해 IT 발전에 영향을 주는 기존 요인들과 함께 세계체제의 분업구조상 위치로서의 요인이 내포하는 이론적 의미를 살펴본다. 방법론적으로는 세계체제론과 연결망 이론이 갖는 논리적 유사성을 바탕으로 네트워크분석에 의해 세계체제 내에서 각국의 위치를 나타내는 변수를 생성하고, 삶의 질, 탈물질주의 가치관, 경제규모를 포함하는 발전요소와 함께 회귀분석을 통해 IT 발전에 미치는 영향을 진단한다. 분석결과, 세계체제가 견고히 존재하고 있으며 구조적 등위성과 위세점수를 따라 크게 3블록으로 나누어지는 것을 알 수가 있다. 여타 변수들을 통제할 경우 중심부에 위치한 국가일수록 IT가 발전하는데 비해 주변부에 위치할수록 IT 발전은 저해되고 있으며, 각국이 가진 발전과정의 내재적 요인으로 지적되었던 삶의 질과 탈물질주의 가치관도 IT 발전과정에서 중요한 요소인 것으로 나타나고 있다. 이는 개발도상국의 경우 경제성장과 삶의 질을 향상시키되 세계체제 내에서 중심부로의 이동과정을 통해 IT 발전을 성취해야 하기 때문에 발전전략 면에서 구조적으로 불리한 상황에 놓여있음을 의미한다. In an optimistic prediction that IT can facilitate the development of society and economic growth, less developed countries are confronted with both the expectation of development and the pressure of global competition. They lag behind the more developed countries in the IT development. This paper proceeds from the previous studies of global digital divide that have pointed out internal factors for the difference of each countries such as economic, socio-cultural and political factors, and suggests a new angle on the IT development in global dynamics, highlighted by the world system theory. Methodologically, this study coins the world system variables by the network analysis, based on the similarity between world system theory and social network theory. The regression results suggest that world system status increases IT development, and the internal factors of each countries are emerged as important factors, including quality of life and post-materialism value. That is, less developed countries are in the disadvantaged position in the IT development than more developed countries, since they need to improve the quality of life as well as economic growth, to succeed in the shift from the periphery to the semi-periphery or the core.
이범석(Beom Seok Lee),홍신희(Shinhee Hong),김관일(Kwan Il Kim),김태령(Tae Ryung Kim),이경희(Kyung Hee Lee),이태훈(Tae Hoon Lee),박흥규(Heung Kyu Park),전용순(Yong Soon Chun) 대한종양외과학회 2015 Korean Journal of Clinical Oncology Vol.11 No.1
Purpose: Aging is one of the greatest risk factors for breast cancer. The elderly population of Korea is growing rapidly. This study was conducted in order to assess the clinical characteristics of elderly women with breast cancer and evaluated the determinants and effects of treatment for breast cancer among elderly. Methods: Medical records of 1,580 patients who were diagnosed and treated for breast cancer at Gachon University Gil Medical Center between 2002 and 2012 were reviewed. Tumor characteristics, surgical method, and adjuvant therapy were considered according to age ≥60 years and <60 years. Results: The number of childbirths and the proportion of postmenopausal women were higher in elderly. There were no differences in family history, tumor size, and the number of metastatic lymph nodes between two age groups. 47.1% elderly patients had undergone a mastectomy. Adjuvant chemotherapy was effective on patients with positive hormone receptor and no lymph nodal invasion but did not affect survival rate of patients with negative hormone receptor. Postoperative radiation therapy is effective in young patients with breast conserving surgery and elderly with mastectomy. Poor prognostic factors in elderly were lymph nodal invasion, recurrence, triple negative, negative for progesterone receptor and negative for p53. Conclusion: The prognostic factors of elderly breast cancer patients are hormone receptor status and lymph nodal invasion. Triple negative status is more critical to elderly. Adjuvant therapy showed a similar effect in elderly and young patients. Therefore appropriate surgical and adjuvant treatment considering comorbidity and adverse effect should be administered to elderly patients.