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QFN 반도체 패키지의 외형 결함 검사를 위한 효과적인 결함 분류 시스템 개발
김효준,이정섭,주효남,김준식,Kim, Hyo-Jun,Lee, Jung-Seob,Joo, Hyo-Nam,Kim, Joon-Seek 한국융합신호처리학회 2009 융합신호처리학회 논문지 (JISPS) Vol.10 No.2
There are many different types of surface defects on semiconductor Integrated Chips (IC's) caused by various factors during manufacturing process, such as cracks, foreign materials, chip-outs, chips, and voids. These defects must be detected and classified by an inspection system for productivity improvement and effective process control. Among defects, in particular, foreign materials and chips are the most difficult ones to classify accurately. A vision system composed of a carefully designed optical system and a processing algorithm is proposed to detect and classify the defects on QFN(Quad Flat No-leads) packages. The processing algorithm uses features derived from the defect's position and brightness value in the Maximum Likelihood classifier and the optical system is designed to effectively extract the features used in the classifier. In experiments we confirm that this method gives more effective result in classifying foreign materials and chips. 반도체 외관결함에는 발생 요인이 각각 다른 crack, foreign material, chip-out, chip, void 등이 있으며, 검사 시스템에서는 결함 유무 및 결함 분류를 수행하여 효과적인 공정관리가 가능하여야 한다. 본 논문에서는 QFN 패키지 결함의 분류를 위한 알고리즘 및 광학시스템을 제안한다. 제안한 방법에서 분류가 어려운 결함 중 하나인 foreign material 과 chip의 효과적인 분류를 위해 제안한 결함의 위치, 밝기의 특징정보(feature)를 사용한 ML(Maximum Likelihood ratio) 분류방법 및 특징정보 획득에 효과적인 광학계를 제안하였다. 실험 결과에서 분류가 어려운 foreign material과 chip에 대한 신뢰성 높은 분류성능을 보였다.
열전소자를 이용한 COB LED의 열적 특성 분석에 관한 연구
김효준,김태형,김용갑,황근창,Kim, Hyo-Jun,Kim, Tae-Hyung,Kim, Yong-Kab,Hoang, Geun-Chang 한국전자통신학회 2014 한국전자통신학회 논문지 Vol.9 No.12
This paper was designed to analyze thermal properties using thermoelectric element for air-cooling heat dissipation of 13.2W-class COB LED. For comparative analysis with generally used air cooling methods, the heat sink was designed and produced, and this experiment was conducted to measure the temperature distribution using a contact thermometer while the COB LED was operating for 100 minutes. One result was about $75^{\circ}C$ for the general cooling method, and the other was $57^{\circ}C$ while the thermoelectric element was operating with applying the current of 0.8A to the thermoelectric element. This results confirmed that the method of applying thermoelectric element was much better in the dissipation of thermal condense on the COB LED than that of the general air cooling one. The temperature on the contact points of COB LED using thermoelectric element was decreased about 31% compared with the air cooling method from $75^{\circ}C$ to $57^{\circ}C$. 본 논문에서는 13.2W급 COB LED의 공랭식 방열을 위해 열전소자를 이용하여 열적 특성을 분석하였다. 기존 방식과의 방열 성능을 비교 분석하기 위하여 Heat Sink를 설계 및 제작 하였고 실험은 100분간 COB LED를 구동시켜 접촉식 온도계를 통하여 온도 분포를 측정하였다. 접합부의 온도 측정 결과 열전소자를 사용하지 않는 방식에서는 약 $75^{\circ}C$로 나타났고, 열전소자에 0.8A의 전류를 인가하여 구동하였을 때 $57^{\circ}C$로 열 응집현상이 가장 심한 COB LED 접합부분의 열은 기존의 방식보다 약 31% 감소됨을 확인하였다.
Incremental Technique과 Composite Resin을 이용한 손상된 전치부 수복: Case Reports
김효준,Kim, Hyo-Jun 대한심미치과학회 2000 Journal of the Korean Academy of Esthetic Dentistr Vol.9 No.1
Direct bonded restoration with composite resin is one of the few areas which the achievement and result are available in chair side. Especially free-hand bonding technique and incremental technique give us challengeable opportunity for restoring severely damaged anterior teeth. If clinicians have keen sense of observation to evaluate polychromatic characteristics of natural teeth, hue, chroma, value, translucency, opacity and correlate the observation result with various kinds of composite resins, they will have privilege to share joy from restoring damaged anterior teeth in chair side immediately.
국내 임상연구 문헌고찰을 통한 단일 관절 질환의 봉약침요법 응용례 분석
김효준 ( Hyo-jun Kim ),김국범 ( Gook-beom Kim ),박주언 ( Joon Park ),권용수 ( Yong-su Kwon ),유재은 ( Jae-eun Yu ),이희원 ( Hee-won Lee ),배준효 ( Jun-hyo Bae ),최규철 ( Gyu-cheol Choi ),배지은 ( Ji-eun Bae ),한수빈 ( Su-bin Han ) 한방재활의학과학회 2021 한방재활의학과학회지 Vol.31 No.1
Objectives This review aims to analyze the current research trend in the usage of bee venom (BV) acupuncture for articular diseases of single type joint. Methods We collected 74 articles on BV acupuncture clinical study for articular diseases of single joint by searching Korean web databases ‘Journal of Korean Medicine Rehabilitation’, ‘Oriental Medicine Advanced Searching Integrated System’, ‘Korean Traditional Knowledge Portal’ from 1999 to 2020 August. Results We summarized the most frequent clinical treatment methods of BV acupuncture for articular diseases of single type joint. Research focused on specific diseases in application of BV acupuncture about some articular type diseases of single joint. It is assumed that the details of treatment for each joint are not related to the type of joint. In clinical study of BV acupuncture, reproducibility was mostly insufficient. Conclusions BV acupuncture clinical study for articular diseases of single joint should be proceed for a number of subjects, to treat various types of disease, by using more safe and detailed treatments. (J Korean Med Rehabil 2021;31(1):119-135)
에밀 뒤르켐의 도덕교육론을 적용한 초등학생의 정보통신 윤리 수업설계 및 적용
김효준 ( Hyo Jun Kim ),김성식 ( Seong Sik Kim ) 한국컴퓨터교육학회 2013 한국컴퓨터교육학회 학술발표대회논문집 Vol.17 No.2
공동체적 관점에서 정보통신윤리교육에 접근하는 것이 필요하며, 이를 위해 도덕적 사회화를 강조한 에밀 뒤르켐의 공동체 도덕성, 즉 자율성, 규율의 정신, 집단의 애타심 요소를 모두 포함하는 정보통신윤리 수업을 설계하고 그 효과를 검증하고자 하였다. 첫째, 초·중등학교 정보통신 기술교육 운영 지침 개정안과 2007개정 7차교육과정을 분석하여 정보통신윤리의 상위지표인 절제, 존중, 책임, 참여를 기준으로 목표를 세분화 하였다. 둘째, 분석된 목표를 구조중심 협동학습 수업모형을 이용하여, 공동체 도덕성의 요소와 정서교육·습관교육이 모두 포함될 수 있도록 수업을 설계하였다. 그리고 효율적인 학습이 이루어 질 수 있도록 4명을 윤리의식 정도를 기준으로 학습집단을 조직하여 협동학습이 원활히 이루어지도록 하였다. 그 결과, 실험 집단이 통제집단보다 더 큰 효과가 있음을 확인하였다. 이는 에밀뒤르켐의 도덕교육론을 적용한 정보통신윤리 수업이 초등학교 6학년 학생의 정보통신윤리의식 함양에 효과적임을 알 수 있었다.
조직 내 중심성이 IT활용능력에 미치는 영향: 소셜네트워크 관점
김효준 ( Hyo Jun Kim ),곽기영 ( Kee Young Kwahk ) 한국정보시스템학회 2011 情報시스템硏究 Vol.20 No.1
In organizations, evaluating the competency of individuals through the position or status has many limitations. To overcome these limitations, this study analyzes the organization`s informal network using social network analysis. We measured out-degree centrality and in-degree centrality by making use of social network analysis technique. Out-degree centrality is interpreted as ``madangbal`` in that actors actively help other people, while in-degree centrality is interpreted as ``prestige`` in that other people want to have a relationship with. This research examines the effects of individual`s ``prestige`` and ``madangbal`` in the instrumental network and communication network on IT competency. We carried out empirical analysis using social network data that were collected from undergraduate students. The result reveals that relationship between IT competency and centrality in the instrumental network is statistically significant, while relationship between IT competency and centrality in the communication network does not show significant results.