기체 분위기에 따른 GaN 에피층의 열처리 효과

우시관,박성은,오병성 충남대학교 기초과학연구소 2001 忠南科學硏究誌 Vol.28 No.2

The changes due to the annealing in the electrical and optical characteristics of GaN epilayers have been investigated. The annealing was performed in hydrogen, nitrogen and ammonia gas environment. X-ray diffraction, Hall effect and photoluminescence measurement showed that the characteritics were unproved after the annealing ammonia gas. It is attributed to the reduction of N vacancy in the epilayer by the thermal dissociation of ammonia gas.

보문산공원 야간이용 활성화 방안

이시영, 이재만, 양뢰, 천현우 배재대학교 자연과학연구소 2013 自然科學論文集 Vol.24 No.1

This study is aimed to find ways to analyze the current nighttime use of mountainside Mt.Bomunsan Park and thereby, to increase the efficiency of mountainside parks situated in urban areas, by case-studying other similar parks whose nighttime use has been facilitated. Also, the study focused on identifying diverse leisure activities for urban citizens to enjoy at night at such parks. First, the Mt.Boumunsan Park area was analyzed in its current nighttime use, space by space, to learn how the park is used by the public at night. Second, other parks whose physical environment is similar to that of Mt.Boumunsan Park were case-studied so that the result could be reflected on the operation of Mt.Boumunsan Park. Third, revitalization suggestions were made for the visit to Mt.Boumunsan Park during nighttime so that they can be referred to as basic data when planning and designing a park in the future for more efficient spacing. It is anticipated that when planning and designing is under consideration to improve Mt.Boumunsan Park, it is better to devise, after taking into account the local government's financial status and the public opinions, a short-and mid-term plan will better serve citizens than a non-feasible long-term master plan.

북한이탈주민의 사회적응 7년 추적 연구 : 생활과 교육을 중심으로

전우택,유시은,엄진섭,김희진 연세대학교 통일연구원 2009 통일연구 Vol.13 No.1

The purpose of this study is to analysis the change patterns of life style and education of North Korean defectors. The questionnaire of this study is for two hundred North Korean defectors who had entered South Korea in 2001. The questions are about residence, education, legal issue, and health. According to this study, the residences of the defectors were still concentrated on the Metropolitan area. Type of residence has become varied so as to increase proportion of their own-houses and long-term leases. Males had got educated for employment purpose, while females had learned using computer the most. Among age groups, the 20s and the 30s had taken regular education the most. As the length of staying in South Korea had increased, the legal cases had decreased; however, the legal issues had become more complicated. The number of the defectors with chronic diseases has gradually declined; thus, overall health status of the defectors had become better. As the length of staying in South Korea had increased, their needs for supports of basic life had decreased, while the demands for consultation about marriage and legal issues. In the conclusion, we point out several ideas based on this study result, which can be utilized in developing policies and supporting programs for North Korean defector adaptation in South Korea.

남한 내 북한이탈주민들의 3년간 사회의식 변화 및 생활 만족도에 대한 추적연구

전우택,유시은,조영아,홍창형,엄진섭,서승원 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.3

Objectives : The aim of this study was to examine the change in attitudes and satisfaction level of North Korean defectors in South Korea over a 3 year period (2001-2004). Methods : In our first study in 2001, a total of 200 detectors were interviewed. In the follow up study after 3 years, 151 defectors were re-interviewed by an in-person interview. Results : The level of satisfaction to the governmental support policy to defectors decreased significantly. However, the general level of satisfaction increased slightly (from 3.52 to 3.56 ; 5-score scale). This shows that North Korean defectors are stably adapting to South Korean society. The level of satisfaction significantly correlated with the defectors' confusion of the different value systems, the defectors' understanding of the South Korean people, satisfaction with their physical and mental health, and the Prejudice of South Korean people to defectors. In terms of the attitudes, the type of schooling, the military service and the communist party membership in North Korea were not related to the change in attitude. However, there was a significant correlation with gender and age. Women showed a greater change in attitude compared to men. Older people had difficulty in understanding the South Korean people, but they showed little psychological affiliation to North Korea. Moreover, they showed a high level of satisfaction with the economic situation in South Korea and had an optimistic viewpoint for their future than younger people. Even though many defectors attended churches, religion was not associated with the level of satisfaction or their change in attitude. Conclusion : The factors that influence the level of satisfaction and attitudes of North Korean defectors have changed over 3 years. Therefore, the government, nongovernmental organizations (NGOs) associated with defectors and the churches need to be more sensitive to these changes and make plans to support the adaptation of defectors to South Korean society.

남한 내 북한이탈주민의 3년간 사회적응 추적 연구 : 2001년부터 2004년까지 생활과 교육을 중심으로 With prioty given to life of North Korea defectors from 2001 to 2004

유시은,전우택,조영아,홍창형,엄진섭 연세대학교 통일연구원 2005 통일연구 Vol.9 No.1

Purpose of this study : In 2001, this study that investigate actual conditions about adaptation degree of Korean social life of the North Korean defectors was carried out to 151 people that succeed in chases among 200 the North Korea defectors answer in study. Purpose of this study is as following. First, we wished to search change aspect of actual conditions about South Korea society adaptation of the North Korean defectors who take part in the first investigation for past 3 years. Second, we wished to search difference of adaptation aspect by populational and social element. Third, We wished to suggest things that can be beaconed to efficient support policy of government or private organization and successful South Korea social adaptation method which support the North Korean defectors on the basis of study finding about change of adaptation aspect of the North Korea defectors. Methods of Study : We designated 200 Panels to study and survey actual adaptation conditions of the North Korean defectors on South Korea society synthetically and for long-term. So, chasing about 151 people was possible in 2004. We are fertilized and supplement the questionnaire forming in 2001 and composed the new questionnaires to part of a life, mental state, Body and health. This study among them investigated a standard of living of the North Korean defectors. In this process, interviewer directly asked and recorded questions to reduce individual variation of people who receive interview. Study Results : Government's residence support policy about North Korean secession inhabitants was generally attained as effective and suitable for North Korean inhabitants' early South Korea settlement. Only, government need to discuss about North Korea secession inhabitants' residence support more variously for long-term. Second, education should be supported more actively and variously. Suitable point of education for their needs should make a effect of vocational training or education maximize. This is a very important part. Third, they need guidance and education that can receive more easily law support. Fourth, medical supports and health cares should be achieved continuously and systematically to them since they arrived in South Korea. To supports and studies North Korean secession inhabitants has the large significance to gain a foothold about reunification of North and south. Their South Korea society adaptation is becoming topic of conversation among South Korean. An atmosphere of unity is elated. And interest degrees about North Korean are actually rising as exchanges between South and North Korean is activated. Therefore, the adaptation study about North Korean secession inhabitants will have to be expanded in studies for South Korean, not to be limited in studies for North Korean.

열형광 CaSO₄ : Dy 소자의 최적 제조조건에 관한 연구

양정선,장시영,김장렬,김두영,남영미,박재우 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1

An experimental investigation has been performed to determine optimal conditions for preparing the thermoluminescent CaSO_(4):Dy pellets which have been widely used as personal radiation dosimeter material. Our investigation has shown that an optimal weight concentration of the dopant Dy in the bulk CaS0_(4):Dy is 0.1 mol%. and an optimal temperature of adding Dy in the preparing process is 320℃. An optimal time and temperature for sintering the CaSO_(4):Dy crystal produced from the chemical process are found to be 2 hours and 800℃. respectively. The maximum thermoluminescent sensitivity was observed when the CaSO_(4):Dy crystal was pulverized to grain sizes of 63 - 200 m in diameter before being fabricated into pellets. The commercial Teflon was selected as an adhesive for the fabrication of the CaSO_(4):Dy pellets with an optimal mixing ratio of the Teflon and CaSO_(4):Dy being 70 to 30 in weight.

열형광 CaSO₄:Dy 소자의 최적 제조조건에 관한 연구

김장렬,남영미,장시영,김두영,양정선,박재우 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.1

An experimental investigation has been performed to determine optimal conditions for preparing the thermoluminescent CaSO4:Dy pellets which have been widely used as personal radiation dosimeter material. Our investigation has shown that an optimal weight concentration of the dopant Dy in the bulk CaSO4:Dy is 0.1 mol%, and an optimal temperature of adding Dy in the preparing process is 320 ℃. An optimal time and temperature for sintering the CaSO4:Dy crystal produced from the chemical process are found to be 2 hours and 800 ℃, respectively. The maximum thermoluminescent sensitivity was observed when the CaSO4:Dy crystal was pulverized to grain sizes of 63 - 200 ㎛ in diameter before being fabricated into pellets. The commercial Teflon was selected as an adhesive for the fabrication of the CaSO4:Dy pellets with an optimal mixing ratio of the Teflon and CaSO4:Dy being 70 to 30 in weight.

What is our country to Jeju People ? : Understanding hidden stories and of Jeju People from the Jeju 4.3 Uprising during ‘peacetime’ Korea with School Students

Shi woo Song 세계환경사회거버넌스학회 2018 World Environment and Island Studies Vol.8 No.2

Jeju 4·3 Peace·Human Rights Education at School -Focus on High School Case-

Shi-woo Song 세계환경사회거버넌스학회 2020 World Environment and Island Studies Vol.10 No.1

Synchrotron Radiation Induced Photochemical Reactions for Semiconductor Processes

Shi-Woo Rhee 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.2

Valence or core electron excitations induced by Synchrotron radiation (SR) irradiation and ensuing chemical reactions can be applied for semiconductor processes, i,e., deposition, etching, and modifications of thin film materials. Unique selectivity can be achieved by this photochemical reactions in deposition and etching. Some materials can be evaporated by SR irradiation, which can be utilized for low temperature surface cleaning of thin films. Also SR irradiation significantly lowers the reaction temperature and photon activated surface reactions can be utilized for direct writing or projection lithography of electronic materials. This technique is especially effective in making nanoscale feature size with abrupt and well defined interfaces for next generation electronic devices.