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강재관,로버츠, 첼 慶南大學校 附設 基礎科學硏究所 1999 硏究論文集 Vol.13 No.-
This paper focuses on the development of a hybrid approach to accessibility evaluation and introduces a robust representation methodology for tool accessibility in NC manufacturing of prismatic parts. A definition and framework for accessibility is provided and the strengths and weaknesses of reviewed techniques are examined. The proposed hybrid approach to accessibility evaluation in manufacturability evaluation and the potential benefits to be extracted from accessibility are described in detail. The representation schema for accessibility in determination of manufacturability is also discussed.
Addition of α,α-Difluoroiodomethyl Ketones to Alkenes with a Copper Catalyst
Kyung Chell Kwak,Woo-Yiel Lee,Quan Zheshan,Young Hang Lee,Young-Gab Yun,Gyu Beum Kwak,Hun-Taeg Chung,Tae-Oh Kwon,Kyu Yun Chai* 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.1
The addition reactions of α,α-difluoroiodomethyl n-butyl ketone, α,α-difluoroiodomethyl cyclohexyl ketone,or α,α-difluoroiodomethyl phenyl ketone to alkenes were successfully accomplished in good yields in the presence of copper powder. The reaction was also applicable to alkenes containing a variety of functional groups such as ester, trimethylsilyl, or ether group. Acetonitrile was determined to be the best solvent in the present study and the reaction was performed at 55 oC for 15-22 h. This reaction provides a new, efficient and general method for the synthesis of α,α-difluoro functionalized ketones.
Addition of α,α-Difluoroiodomethyl Ketones to Alkenes with a Copper Catalyst
Kwak, Kyung-Chell,Lee, Woo-Yiel,Zheshan, Quan,Lee, Young-Hang,Yun, Young-Gab,Kwak, Gyu-Beum,Chung, Hun-Taeg,Kwon, Tae-Oh,Chai, Kyu-Yun Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.1
The addition reactions of $\alpha$,$\alpha$-difluoroiodomethyl n-butyl ketone, α,α-difluoroiodomethyl cyclohexyl ketone, or $\alpha$,$\alpha$-difluoroiodomethyl phenyl ketone to alkenes were successfully accomplished in good yields in the presence of copper powder. The reaction was also applicable to alkenes containing a variety of functional groups such as ester, trimethylsilyl, or ether group. Acetonitrile was determined to be the best solvent in the present study and the reaction was performed at 55 ${^{\circ}C}$ for 15-22 h. This reaction provides a new, efficient and general method for the synthesis of $\alpha$,$\alpha$-difluoro functionalized ketones.
β-Fluoro-α-phenylpyrrole 유도체의 합성에 관한 연구
郭炅喆,吳賢哲,鄭悳商,李英行,白承和,金鍾洙,蔡奎允 濟州大學校 基礎科學硏究所 2001 基礎科學硏究 Vol.14 No.2
플루오르가 선택적으로 치환된 유기화합물은 모체 화합물 보다 향상된 생리활성을 지니는 경우가 많이 보고 된바 있다. 이는 할로젠족 원소인 플루오르의 큰 전기음성도 때문에 비교적 강한 탄소플루오르 결합 형성 및 증가된 리피드 용해도 때문이다. Pyrrole과 그의 유도체들은 폴리머, 의약품 그리고 염료 등에 광범위하게 사용되어 왔고 오래 전부터 잘 알려진 화합물이다. 최근 자연계에서 산출되거나 합성 가능한 플루오르가 선택적으로 치환된 fluoropyrrole 유도체들은 진통제, 소염제 및 살균제 등으로 다양하게 이용될 수 있음이 알려져 있기 때문에 fluoropyrrole 유도체의 합성에 대한 연구가 활발히 진행되고 있다. 일반적으로 플루오르는 반응성이 매우 커서 유기화합물에 대한 선택적인 플루오르기의 도입이 극히 제한적이다.
劉鍾哲 충주대학교 1992 한국교통대학교 논문집 Vol.26 No.-
In proportion to increasing of national incomes, the consumption of energy grows increasingly Inevitablly the more eletric power production is needed. Theoretically, for out land is small, the generating electricity by waterpower is not good. The generating electricity by steampower is not good, either. Though is construction is economically profitable, our country must import all Oil and Coal, in a long time the system has a handicap on the feul. So, we should solve the problem of lthe domestic insufficient energy by the study on the most economical and efficient generating electricity system.
李秉哲,金種石 충남대학교 교육대학원 1983 碩士學位論文集 Vol.1 No.-
The purpose of this study was to investigate the present situation of the school for the aged in order to find the problems and to improve educational condition for the school of the aged. The population for this study was the aged who enrolled the schools in Taejon and Taeduggun area of Chung Nam Province. The questionnaire was developed by the investigator based upon the review of the literature and the purpose of this study, and administered to the 586 aged students in the area covered. The area of this study was considered sample of urban and rural area. The method of administration of this study was the combination of interview by the investigator and elf report by the questionnaire. The findings of this study were as follows: 1. Less than 50% of the enrolled students are attending the school and a total of 1.2% of the aged population of this area participate in the school program for the elders. A total of 80.1% of the students enrolled in this program consists of the aged women of the students both men and women want to work for themselves. 2. The problems of the adminstration of these school were administrative organization financial affairs and qualification of administrators. 3. These problems found in curriculum area are: 1)No text book has been utilized in the classroom even though there is some text books published by varies organization. 2) The length of education and number of class per a week or a month were inconsistant. 3) The process of selection and qualification of the instructors were not specified. 4) Instructional methods were inconsistent the lecture by the instructor was dominant method. Majority of the schools for the aged have many problems such as area of the moral of students, administrative organization and finances, and curriculum area. In order to solve the problems this investigator provide the following suggestions: 1) Nationwide study similar to this study should be investigated in order to improve the schools for the aged. 2) Financial supports should be strengthened by Government and private organization. 3) More space should be available to this program. 4) Administrative leadership by Ministry of Education should be exercised to improve the school conditions. 5) Model curriculum should be developed on the national bases for both urban and rural communities.
지리적 특성으로 인한 소수 민족 Kaguru 원시 부족에 대해 자연재해가 미친 환경과 문화 연구
홍성룡 ( Sung Ryong Hong ),미쉘최 ( Mi Chelle Choi ) 한국사진지리학회 2014 한국사진지리학회지 Vol.24 No.4
모든 큰 사회 안에 소수 인종으로 구성된 민족과 그 지리적 특성으로 인해 그 소수만이 가지고 있는 여러 특징들을 가지고 있다. 소수 민족인 원주민의 삶, 언어, 문화는 다수의 민족과 다르다. 남아프리카의 역사는 여러 소수 민족의 집단의 관계와 충돌의 연속으로 구성되어 있다. 탄자니아는 아프리카의 동쪽에 위치한 국가로 1964년에 영국의 식민지로부터 독립하였다. Magubike는 탄자니아 북쪽에 위치한 마을로 Kaguru 지역 출신의 사람들이 거주하였다. Kaguru 부족은 동아프리카 종족과 달리 뛰어난 스타일로 가진 조각품들을 그들의 문화에서 발견할 수 있다. 본 연구는 지금까지 잘 알려지지 않은 소수민족 중 아프리카 탄자니아의 동쪽에 위치한 카구루 부족에 대한 초기의 삶과 그들의 사회적 특징, 지리적 환경과 자연 재해로 인한 고난, 이들의 주거문화와 음식문화에 대한 연구를 통하여 소수 민족이 가지고 있는 가치를 재조명하고자 하였다. There exist many features in a culture within all big societies that only it alone possesses due to its ethnic and geographic characteristics. The culture, language, and life of indigenous ethnic minorities are different from those of the majority of their nation. The history of South Africa is made up of a series of conflicts among various ethnic groups. Tanzania, an Eastern African country, became independent from British colonization in 1964. Magubike is a village located in the northern part of Tanzania inhabited by the Kaguru local people. This study is to describe the wide range of cultural influences of Kaguru tribe and the impact of natural disaster on the life based on geographical environment which they had. This research investigates the society of Kaguru through two perspectives: firstly, the geographical characteristics that has ruled the lives of the Kaguru and the British colonial society in the 1960; and secondly, to provide the analysis and comparison of the characteristics of early Kaguru culture, history, and legend.