열충격 시험을 통한 MLCCs SAC305 무연 솔더 접합부의 IMCs 성장과 접합특성 저하에 관한 연구

정상원,강민수,전유재,김도석,신영의,Jung, Sang-Won,Kang, Min-Soo,Jeon, Yu-Jae,Kim, Do-Seok,Shin, Young-Eui 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.3

The bonding characteristics of MLCCs (multi layer ceramic capacitor, C1608) lead-free solder (SAC305) joints were evaluated through thermal shock test ($-40^{\circ}C{\sim}125^{\circ}C$, total 1,800 cycle). After the test, IMCs( intermetallic compounds) growth and cracks were verified, also shear strengths were measured for degradation of solder joints. In addition, The thermal stress distributions at solder joints were analyzed to compare the solder joints changes before and after according to thermal shock test by FEA (finite elements analysis). We considered the effects of IMCs growth at solder joints. As results, the bonding characteristics degradation was occurred according to initial crack, crack propagations and thermal stress concentration at solder-IMCs interface, when the IMCs grown to solder inside.

태권도인의 저변확대를 위한 뉴 마케팅 전략 탐색과 발전 방안모색

정상원(Sang Won Jung) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.40

This study was designed to research the new Marketing Strategy and Development Plan for Popularization of Takendo People and to research efficiential management method according to presenting current problem point through literature review. On the basis of the results analyzed in this study, the conclusion could be drawn as follows. 1. The many problems was caused to rapid growth of past 20years in taekwondo environments. 2. This problems appeared to the many of taekwondo drill hall, just children consumer, old facility, simple program, entertainment lose, just win trait, many leader product. 3. The social change processing of taekwondo appeared to classic background, nationalism sport, glovalization, popularization. 4. The new marketing strategy appeared to the open of taekwondo drill hall management program competition for efficiential program provide and the important of advertisement and public relation strategy and taekwondo culture marketing and seesighting marketing and consumer relation marketing for taekwondo drill hall management activation. 5. The internal power and effort(new marketing) appeared to necessary factor for control of uncontrol eternal factor(educational system, childbirth rate down) in modern taekwondo environments.

한 초임교수의 쿠레레 탐구

정상원(Sang-Won Jung),윤홍주(Hong-Ju Yun) 한국내러티브교육학회 2020 내러티브와 교육연구 Vol.8 No.3

교육 현상을 바라보는 하나의 렌즈로서 교사의 삶은 많은 관심을 받아왔다. 그리고, 이러한 흐름 속에서 다양한 교사들의 삶이 탐구되어왔다. 이러한 관점에서 이 연구는 초임교수의 삶과 그것에 기반한 주관성을 쿠레레 방법을 통해 탐구해보고자 한다. 연구의 결과, 한 초임교수의 주관성은 열등감과 극복으로 구성되어 있었으며, 이러한 주제는 그의 삶의 전반에 걸친 교육적 경험을 통해 형성되어왔다. 이러한 주제들은 열등감 배우기와 외면하기, 열등감 대면하고 극복하기, 경계에서 서서 나의 가치를 증명하기, 열등감을 삶의 원천으로 삼기로 종합해 볼 수 있었다. 극복노력, 이러한 연구의 결과는 학교의 개선과 교육과정 연구의 개선에 의미 있는 시사점을 제공해 줄 수 있을 것이다. The life of a teacher has received a lot of attention as one of the lenses seen as an educational phenomenon. Under this attention, various forms of teachers lives have been studied. This study seeks to explore the life of a professor based on the subjective Currere method. Through examining the educational experiences of the professor s life, the subjectivity of the professor was established and consisted of the professor s inferiority complex and overcoming. These subjectivity could be summarized as learning and disregarding inferiority, confronting and overcoming inferiority, proving self-affirmation on the edge, and living with inferiority as a source of life. The results of this study may have implications for the improvement of schools and the curriculum research society.

탄성파 토모그래피 자동화 처리 소프트웨어 개발 및 적용성 검토

정상원 ( Sang Won Jung ),하희상 ( Hee Sang Ha ),고광범 ( Kwang Beom Ko ) 한국지구물리·물리탐사학회 2004 지구물리와 물리탐사 Vol.7 No.3

아파치 카프카를 활용한 블랙박스 영상에서의 차량 번호판 인식 방법

정상원 ( Sang-won Jung ),정승원 ( Seung-won Jung ),황인준 ( Een-jun Hwang ),정창성 ( Chang-sung Jeong ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1

차량의 블랙박스와 CCTV, 드론 등 다양한 채널에서 촬영된 영상의 증가로, 차량 및 교통 상항과 관련된 데이터의 양 또한 폭발적으로 증가하고 있다. 본 연구에서는 이러한 데이터들의 고속 처리를 위해, 실시간 메시지 분산처리 시스템인 아파치 활용하여 블랙박스 영상의 프레임을 여러 노드에 분배하였다. 또한, 각각의 노드에 들어온 블랙박스 영상의 프레임을 입력으로 하여, 영상처리 기법을 통한 번호판의 지역화와 문자 분할 및 이를 안식하기 위한 연구를 수행하였다.

남명 조식의 사상과 지, 덕, 체의 교육적 연계성 탐색

정상원(Jung, Sang-Won) 한국사회체육학회 2017 한국사회체육학회지 Vol.0 No.68

This study is designed to research the educational connection research of knowledge, virtue, physical and thought of Nammyeong(南冥) Jo Sik(曺植). On the basis of the results analyzed in this study, the conclusion could be drawn as follows. Firstly, Nammyeong taught practical life method through physical action. When the nation was in crisis, he taught war method and war skill to pupils and taught actual life pattern. Secondly, Nammyeong thought Gyeong[敬] and Yui[義] important with practical thought of people and thought practical doing more important than theoretical background screen for overcoming modern society crisis. Thirdly, Toegye(退溪) Yi Hwang(李滉) showed theoretical pattern for actual life application of Gyeong[敬]and Yui[義], whereas Nammyeong showed practical pattern for actual life application of Gyeong[敬] and Yui[義]. Fourthly, When Nammyeong taught pupils, he understand the gift of learners according to each one’s ability and aimed learner centered education. Fifthly, The relationship of self realization and existence theoretical problem related to physical activity is to develop the perfect people through cultivation of knowledge, virtue and body with Gyeong[敬]and Yui[義] of Nammyeong. Sixthly, the emphasis of sportsmanship in connection with Gyeong[敬]and Yui[義] is the foundation method for ethical problem solution of sport. The cultual variable to practice, drill and learning of Gyeong[敬]and Yui[義] are sport and physical education activity.

Thermochromic Hybrid Nanoparticles Comprising a Tungsten-Doped Vanadium Dioxide Core and a Poly(N-isopropylacrylamide) Shell Structure

Sang Won Jung(정상원),Sang Hwi Park(박상휘),Jung Whan Yoo(유중환),Juhyun Park(박주현) 한국고분자학회 2021 폴리머 Vol.45 No.2

열변색 스마트 창호 소재로서 텅스텐이 도핑된 바나듐이산화물(WxVO₂) 나노입자와 폴리이소프로필아크릴아미드(PNIPAm)의 하이브리드 나노입자가 실리카 쉘 형성 및 PNIPAm의 표면라디칼 중합반응에 의해 합성되었다. 하이브리드 나노입자의 수분산액은 섭씨 28도의 금속-절연체 전이온도를 보유한 WxVO₂ 코어와 섭씨 32도의 하한임계 용액온도를 보유한 PNIPAm 쉘의 특성으로 인해 가시광선에서 근적외선까지의 넓은 스펙트럼 범위에서 효과적인 열변색 특성을 보였다. 하이브리드 나노입자에서 PNIPAm의 함량을 고정시키고 WxVO₂의 함량을 변화시키며 특성을 측정한 결과 섭씨 20도에서 40도의 온도 변화에서 25% 이상의 태양광 변조 변화를 구현하였으며 WxVO₂의 함량증가에 따라 입자의 증가된 뭉침현상에 의해 투과도는 85%에서 15%까지 급격하게 감소하였다. 본 연구결과는 WxVO₂효율적인 열변색 소재를 제조하기 위한 주요 기술이 될 수 있음을 보여준다. Hybrid nanoparticles based on tungsten-doped vanadium dioxide (WxVO₂) nanoparticles and poly(N-isopropylacrylamide) (PNIPAm) for thermochromic smart window applications were synthesized via silica layer formation using (3-mercaptopropyl)trimethoxysilane (MPTMS) followed by the surface-mediated free radical polymerization of PNIPAm, resulting in the aqueous dispersion of the hybrid nanoparticles. The metal-insulator transition of the WxVO₂ core at around 28 °C and the lower critical solution temperature of PNIPAm at around 32 °C enable the aqueous dispersion of the hybrid nanoparticles to present an efficient thermochromicity depending on the temperature over a broad spectral range from visible to near-infrared light. The difference in the solar modulation was over 25%, while the luminous transmittance (Tlum) significantly decreased from 85% to 15% with increasing WxVO₂ composition in the hybrids. Our results suggest that the hybridization of WxVO₂ and PNIPAm is a potential methodology for preparing efficient thermochromic materials.

시간-주파수 영역 해석법을 이용한 레이더 영상 품질 개선에 대한 연구

정상원(Sang-Won Jung),김경태(Kyung-Tae Kim) 한국전자파학회 2010 한국전자파학회논문지 Vol.21 No.1

본 논문에서는 흐려진 ISAR(Inverse Synthetic Aperture Radar) 영상의 회전 오차를 보상하기 위해 시간-주파수 영역 해석법을 이용한 회전 이동 보상(rotational motion compensation) 알고리즘을 제시한다. 실제의 비행 환경에서는 표적의 회전이나 가속 등의 움직임으로 인하여 도플러 주파수 천이가 시간에 따라 변하게 되고, 이에 따라 회전 오차(motion error)가 발생한다. 본 알고리즘으로 도플러 주파수 영역 방향으로 흐려진 ISAR 영상을 개선한다. 시뮬레이션 결과, 기동하는 표적에 회전 오차가 있을 경우에 시간-주파수 영역 해석법은 흐려진 레이더 영상의 품질을 개선하는데 효율적임을 알 수 있다. In this paper, an efficient algorithm is developed to perform target rotational motion compensation to achieve the clear inverse synthetic aperture radar(ISAR) image. The algorithm is based on a time-frequency technique. This algorithm provides an efficient method to resolve the blurring image caused by the time-varying behavior of the target scattering centers and leads to a well-focused ISAR image. Results demonstrate that the time-frequency techniques can improve the blurring ISAR image when an aircraft is in complex motion, such as maneuvering, rotation and acceleration.

OPNET을 이용한 Ethernet PON에서의 동적 TDMA MAC 프로토콜의 설계 및 구현

정상원(Sang-Won Jung),장용석(Yong-Seok Chang),엄종훈(Jonghoon Eom),김승호(Sung-Ho Kim) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1A

Ethernet PON(Passive Optical Network)의 핵심 기술 중의 하나인 MAC(Media Access Control) 프로토콜은 ONU(Optical Network Unit)들이 상향으로 트래픽을 전송할 때 공유되어 있는 링크상의 충돌을 방지하고, 효율적인 대역폭을 할당하기 위한 스케줄링 알고리즘을 포함하고 있다. 본 논문에서는 차세대 가입자 망인 Ethernet PON의 성능을 최대화하기 위해, 가입자 망의 특성을 고려한 동적 슬롯 할당 TDMA(Time Division Multiple Access) 방식의 MAC 프로토콜을 제안한다. 이를 검증하기 위하여 OPNET 시뮬레이션 도구를 이용해 Ethernet PON 모델을 설계하고 시뮬레이션 한다.

초등학교 교사들의 라이프스타일과 스포츠활동 유형 및 스포츠관심도의 유기적 관계 연구

정상원(Sang Won Jung) 한국사회체육학회 2007 한국사회체육학회지 Vol.0 No.31

This study was designed to establish actual relationship about life style and sport activity pattern and sport concerning level of elementary school teacher. In this study, questionnaire was used to investigate empirically various sport patterns and sport concerning level and life style of elementary school teacher. The 366 subjects were selected from elementary school in gyeongnam province, who were classified into demographic variable(sex, education career, physical education major, district) and asked to this questionnaire. The subjects were asked to various items belong to each variable. This questionnaire consisted of three-alternative choice pattern of nominal scale, ordinal scale, interval scale on the basis of A.I.O items and demographic variables. The 5% level of significance was used as the critical level for acception of the hypothesis in this study. On the basis of the results analyzed in this study, the conclusion could be drawn as follows. 1. The life style of teacher showed very low level about brand and nihility and showed very high level about self-control and affirm. 2. According to sex, the life style of women teacher showed very high level about fashion, health, confidence and the man teacher showed very high level about achievement, sport. 3. The most doing sport of element school teacher appeared to ball game sport and showed significant difference according to sex, education career, district. 4. The wanting sport of future appeared to lacket sport and swimming, the special point of this study was golf choice of teachers. The teacher selected more golf than other sport(dance, bowling, cycle...). 5. For early education of children, teachers selected swimming to first, dance to secondary. 6. The most teacher exercised 2-3times per week, showed significant difference according to sex, education career, physical education major. In the education career, the exercise frequency of the 6-10years teacher was very low and the high education career teacher was very high. 7. In the sport related monthly used fee, the most teacher appeared to the low of 50,000won. 8. The unexercise reason of appeared to order of time lack, lack of space and ficility, interest lack, fitness lack, money lack.