극저비속도영역에서 원심펌프의 불안정성능 개선에 관한 연구

최영도(Young-Do Choi),쿠로카와준이치(Junichi Kurokawa),김유택(You-Taek Kim),이영호(Young-Ho Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

The ratio of disk friction loss in a centrifugal pump is very large for the total pump oss in the range of very low specific speed. Therefore, impeller radius should be shortened to increase the pump efficiency because the disk friction loss is proportional to the fifth power of impeller radius. In order to compensate the decreased head by the shortened impeller radius, vane angle at impeller outlet should be increased. However, as the vane angle at impeller outlet becomes larger, performance instability occurs at low flow rate regions. In this study, J-Groove is adopted to suppress the performance instability and detailed examination is performed for the influence of the J-Groove on the pump performance. The results show that J-Groove gives good effect on the suppression of performance instability. Moreover, as J-Groove increases pump head considerably, the pump size can be smaller.

노년 초기 재혼자의 결혼성립 과정과 결혼만족에 관한 연구

최영아 ( Young Ah Choi ) 대한가정학회 2005 Human Ecology Research(HER) Vol.43 No.5

반밀폐형 임펠러와 J-그루브에 의한 원심펌프 성능개선

최영도(Young-Do Choi),쿠로카와준이치(Junichi Kurokawa),이영호(Young-Ho Lee) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-

The purpose of present study is not only to develop a simple method to improve pump performance but also to suppress the occurrence of cavitation in the centrifugal pump by use of J-Groove. Semi-closed impeller is a newly developed centrifugal impeller in which inlet shape of the front shroud is modified. J-Groove is a shallow groove installed on the casing wall in the meridional direction. The results show that the application of the new type impeller of semi-closed impeller with J-Groove to a centrifugal pump has proved its effectiveness as a useful countermeasure of the unstable pump performance and cavitation. The combination of semi -closed impeller and J-Groove can be applied successfully and improves both the pump performance and suction performance.

기관지내시경을 통한 Endobronchial Watanabe Spigot (EWS) 삽입으로 치료한 기관지흉막루 1례

최영인 ( Young In Choi ),조진희 ( Jin Hui Cho ),심진영 ( Jin Young Shim ),신승수 ( Seung Soo Sheen ),오윤정 ( Yoon Jung Oh ),박주헌 ( Joo Hun Park ),황성철 ( Sung Chul Hwang ),이성수 ( Sung Soo Lee ) 대한결핵 및 호흡기학회 2005 Tuberculosis and Respiratory Diseases Vol.58 No.4

T-CMOS SPICE Compact Model 제작 및 산포 검증

최영은(Young-Eun Choi),김우석(Woo-Seok Kim),김명(Myoung Kim),김경록(Kyung Rok Kim) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.6

뇌종양 제거 수술 중 발생한 전신 강직간대발작

최영인 ( Young-in Choi ),박형준 ( Hyung-jun Park ),김건식 ( Keon-sik Kim ),강희용 ( Hee-yong Kang ) 경희대학교 경희의료원 2016 慶熙醫學 Vol.31 No.1

Seizure is commonly occurred in patients with brain tumors. The incidence, risk factors, pathophysiological mechanisms, and prophylactic methods of intraoperative seizures are still not clear. A 29-year old man who had no prior history of seizure experienced an intraoperative generalized tonic-clonic seizure-like activity during brain tumor resection. After intravenous propofol 120 mg and rocuronium 20 mg were administrated, the seizure-like activity subsided.

제7장 중학교『기술,가정』과목의 영역별 교육내용 및 활동 체계 분석

최영이 ( Young I Choi ),정찬기오 ( Chan Gi Oh Chung ) 경상대학교 중등교육연구소 2011 중등교육연구 Vol.23 No.-

본 연구의 목적은 중학교 기술·가정 교과 영역의 학습 과제의 체계를 구체적으로 분석하여 제시하는 것이다. 본 연구의 결과를 요약하면, 중학교의 기술·가정 영역별 교육내용 및 활동 체계는『청소년의 이해 및 청소년기의 생활』,『기술의 발달과 미래, 그리고 발명』,『가족 관계와 가정생활의 실제』,『정보 통신 기술과 제조 기술』,『생애설계와 진로탐색, 그리고 가족 복지』,『전자·기계·건설 기술과 생명 기술』로 대별할수 있다. 『청소년의 이해 및 청소년기의 생활』은 청소년의 발달 이해, 청소년의 성과친구 관계 이해, 청소년의 자기 관리 이해, 청소년의 영양과 식사, 옷차림과 자기표현, 청소년기의 소비 생활이 중심이 된다. 『기술의 발달과 미래, 그리고 발명』은 기술의 발달과 생활, 전통 기술의 이해, 미래 사회의 기술, 기술과 발명 아이디어의 구상, 발명 기법과 실제가 중심이 된다. 『가족 관계와 가정생활의 실제』는 변화하는 가족, 가족 관계, 식단과 식품의 선택, 의복의 선택과 관리, 주거와 거주 환경, 식사 준비와 예절, 옷 만들기와 고쳐 입기, 주거 공간의 활용이 중심이 된다. 『정보 통신 기술과 제조 기술』은 정보 통신 기술과 생활, 정보 통신 기술의 활용, 정보 보호와 공유, 제조기술의 이해, 제품의 구상과 설계, 제품 만들기가 중심이 된다. 『생애 설계와 진로탐색, 그리고 가족 복지』는 생애 설계와 실제, 가정생활과 직업생활, 생애 단계와 가족복지, 가족 복지 서비스가 중심이 된다. 『전자·기계·건설 기술과 생명 기술』은 전기·전자의 이해, 기계 운동의 원리, 운동 장치 만들기, 건설 기술의 이해, 건설 구조물의 이용, 건설 구조물 모형 만들기, 생활과 생명 기술, 생명 기술의 활용이 중심이 된다. The purpose of this study was to examine the content elements and activity systems of Technology & Home Economics in the middle school curriculum. Six research questions were posed to serve the purpose ; First, How are the system of learning activity, the content of life education of adolescence based on understanding of adolescents constructed? Second, How are the future of technology, the development of technology, the content of invention education of adolescence constructed? Third, How are the relationship of adolescents with their family, the system of learning activity, and the content of education constructed as a form of real home education? Forth, How are the system of learning activity and the content constructed in both information and communication technology and manufacturing technology education? Fifth, How are the system of learning activity and the content constructed in both life and career planning and the family welfare education? Sixth, How are the system of learning activity and the content constructed in both bio technological education and the education of technology of electronic, machine, and construction? The main materials used for this study are as follows; Proclamation No. 2007-79 of Ministry of Education & Human Resources Development Elementary and Secondary School Practical Arts(Technology & Home Economics) Curriculum(Ministry of Education & Human Resources Development, 2007: Annex 10), Proclamation No. 2007-75 and No. 2007-79 Middle School Curriculum Explanation Ⅲ-Mathematics, Science and Technology & Home Economics(Ministry of Education and Science and Technology, 2008), Teacher`s Guide 1 for Middle School Technology & Home Economics(Seoul Metropolitan Superintendent, 2010), Teacher`s Guide 2 for Middle School Technology & Home Economics(Seoul Metropolitan Superintendent, 2011), Teacher`s Guide 3 for Middle School Technology & Home Economics(Ministry of Education & Human Resources Development, 2002), Textbook of Technology & Home Economics Education-1 (Ministry of Education and Science Technology, 2009), Textbook of Technology & Home Economics Education-2(Ministry of Education and Science and Technology, 2009), and Textbook of Technology & Home Economics Education-3(Ministry of Education and Science and Technology, 2002). The summary of the study results were as follows; the system of learning activity and the content of technology and home economics education in middle school are the understanding for adolescents and the life of adolescence, the development of technology, its future and the invention, the relationship with the family and the practice of real home life, the information, the communication technology and the manufacturing technology, the life and career planning and the family welfare, the technology of electronic, machine, construction and bio-technology. The understanding for adolescents and the life of adolescence, which dealt with the understanding of adolescents development, the sexuality of the adolescents, the relationship of adolescents with their friends, the understanding of adolescents in self-management, the nutrition and the meals of adolescents, the garment of adolescents and self-expression, the consumption life of adolescents. The development of technology, its future and the invention, which dealt with the life and the development of technology, the understanding of traditional technique, the technique of the future, ideas for the technology and invention, the technique of the invention and the practice. The relationship with the family and the practice of real home life, which dealt with changing trend in family, changing relationship in family, choice of food and diet, the choice of clothing and the management, housing and residential environment, the preparation of meals and the table manners, making and reforming clothes, utility of the residential space. The information, the communication technology and the manufacturing technology, which dealt with the life and information and communication technology, the utility of communication technology, the security of the information, and the sharing of the information, the understanding of manufacturing technology, ideas for the products, the designs of the products and the making products. The life and career planning and the family welfare, which dealt with the planning and practice for the life of adolescents, home life of adolescents, the career life of adolescents, the stages of life, the welfare of family and the welfare system of family. The technology of electronic, machine, construction and bio-technology, which dealt with the understanding of electrical and electronic, the principle of movement in machine, making a device for movement, the understanding of the construction technology, the utility of construction structures, making models of construction structures, life and bio-technology and the utility of bio-technology. The directions based on the discussed content and the results are as follows. The domain, the understanding for adolescents and the life of adolescence, which should focus on helping adolescents get to know their physical development phenomenon and their sexual traits which enable adolescents to make sound relationship with their friends. On the ground of that, it should let adolescents analyze their daily life and put adolescents into practice their planned activities and leisure activities in accordance with their aims. The domain, the development of technology, its future and invention, which should focus on how technology can affect the life of human being and make adolescents take pride in their traditional technique and adapt themselves in the change for the new technology. The education should focus on forming practical attitudes, which enables adolescents to solve the problem in their real life by using their daily invention products and getting new ideas. The domain, the relationship with the family and the practice of real home life, which should focus on making adolescents cope with the family conflict. It means adolescents should have positive ways of thinking, which include controling their feelings and needs as well as revealing their true expressions. Through this education, firstly, adolescents should know not only how to make good diets according to the taste of their family but also how to match good dress code in clothing. Secondly, adolescents should experience the procedure of making clothes. Thirdly, adolescents should know how to clean and arrange their living products. The domain, the information, the communication technology and the manufacturing technology, which let adolescents know the procedure of the technology and how it has changed our life. Also through the internet education, adolescents should learn how to get information and share the information. Furthermore, this domain enables adolescents to make the practical products through observing and evaluate their products after completion. The domain, the life & career planning and the family welfare, which make adolescents plan their life and career. And it helps adolescents to find proper ideas for breakthrough against their conflict in their home life and career life. Lastly, it gets adolescents to participate in the programs for the family welfare service in their local community. The domain, the technology of electronic, machine, construction and bio-technology, which convey the principles of electrical the development of technology, its future and the invention electronic appliances in homes to adolescents, and it should give adolescents opportunities to check the real parts of electrical. The development of technology, its future and the invention electronic appliances and make simple controling device. Also, it should let adolescents find the examples of construction structure and building structure. Then, it should let adolescents make the model of construction structure. Besides, it should have adolescents notice the real cases that use the bio-technology and make suggestions about the results, which resulted from the development of the bio-technology in a way of either positive side or negative side.

Track 4 : 컴퓨터과학; 계산과학 문제의 특성과 해결방법의 유사성에 따른 분석

최영일 ( Young Il Choi ),원종훈 ( Jong Hoon Won ),김재욱 ( Jae Uk Kim ),김경만 ( Gyeong Man Kim ),정웅열 ( Ung Yeol Jung ) 한국컴퓨터교육학회 2014 한국컴퓨터교육학회 학술발표대회논문집 Vol.18 No.1

계산과학은 과학이나 공학 분야의 문제에 대하여 수치해석과 컴퓨터 계산을 이용하여 해결하는 방법을 연구하는 학문이다. 계산과학은 기존의 형식적인 수학, 과학적 모델을 통한 해결이 불가능한 문제에 관하여 컴퓨터의 계산 기능에 기반을 둔 새로운 이해와 해석을 제안한다. 본 연구에서는 다양한 계산과학적 문제해결 방법들을 탐색하고, 이를 컴퓨터의 계산적 특성에 따라 분석하였다. 이를 통해 계산과학 문제와 계산과학적 문제해결 방법의 특성을 제시하고, 정보과학의 융합적 성격을 밝힐 수 있을 것이라 기대하기 때문이다.

가족 의사소통에 대한 구성원들의 인식 연구

최영인(Choi, Young-in),권순희(Kwon, Soon-hee) 국어교육학회 2015 국어교육연구 Vol.58 No.-

자질의 상실에 의한 부분 동화작용

최영이 ( Youngyi Choi ),이상도 ( Sangdo Lee ) 한국외국어대학교 언어연구소 2017 언어와 언어학 Vol.0 No.76

This paper is the study on partial assimilation in terms of perceptual cues. Plenty of phenomena that are known as complete assimilation are in reality partial assimilation because a feature of a target segment remains after assimilation, not resembles trigger features or not becomes fully the same as trigger features. To identify a remaining target feature, we observe F1, F2, F3 in spectrogram of Praat. If either F1, the signal for articulatory manner or F2 and F3, the signal for articulatory place of target segment is left, that will be the acoustic evidence of partial assimilation. Inferring underlying input and output from the phenomena and establishing several perceptual constraints regarding perceptual perspective, we proved that all the assimilations are involved in partial because to lose all the target features in assimilation is lack of any efforts for listener`s cognitional ease.