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김윤중(Yun Jung Kim),스티븐김(Steven Kim),조광섭(Guangsup Cho) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
장수명과 고효율을 얻기 위해서는 발광다이오드 칩 구조 등의 성능 향상뿐만이 아니라, LED 칩(Chip)에서 발생되는 고열을 제거하는 방열 기술을 필요로 하고 있다. 본 연구는 표준적으로 사용되는 LED 조명기구의 발열특성, 열에 의한 광속 감소와 열저항을 통해 LED 조명기구의 효율 저하 요소에 대해 분석 하였다. LED 조명기구의 온도 상승이 약 7%정도의 광속 손실을 발생 시켰으며, 온도 측정을 통해 방열에 방해가 되는 조명기구의 구조적인 요소를 분석한 결과 Fin의 폭이 가장 큰 영향을 미치고 있음이 발견되었다. 따라서 LED 조명기구의 설계에 있어 열이 전달되는 충분한 통로를 확보하는 것은 매우 중요한 요소이다. For long life time and high efficiency, not necessary in improvement of LED chip structure, but also improve heat radiation for decrease heat in LED chip. In this study, efficiency decline factor has been investigated in LED lamp as study heat characteristic, luminance flux and heat resistance. When LED lamp temperature was increased, about 7% loss of luminance flux. In consequence of temperature analysis, width of fin was the most important factor of heat radiation. As a result, secure the enough heat path is very important factor of LED lamp design.
인터넷 중독 위험 남자 청소년의 기질성격특성 : 7년의 변화경향
김윤중(Yoon-jung Kim),이상규(Sang-kyu Lee),최종혁(Jong-hyuk Choi),이환배(Hwan-bae Lee) 한국중독정신의학회 2013 중독정신의학 Vol.17 No.2
Objectives : This study attempted to compare findings of two studies (internet use, temperament & character profiles and mood) on internet addiction, which had been performed in 2005 and 2012. Methods : Two cross-sectional studies surveyed using a self-report questionnaire on internet usage pat-tern, Temperament and Character Inventory (TCI) and Beck depression inventory (BDI). The earlier study included 213 male middle school students in 2005, and the latter study included 400 male middle school students in 2012. We compared the prevalence rates and patterns in temperament, character and depressive severity of internet addiction risk group between the two surveys separated by seven years. Results : The prevalence of high-risk internet addiction was 77% in 2005 and 42.1% in 2012. The addiction risk group had higher scores for harm avoidance (HA) and BDI with lower scores for reward dependence (RD), self-directedness (SD), and cooperativeness (CO), compared to the non-addicted group in 2005. The addiction risk group showed higher novelty seeking (NS), HA, and BDI scores with lower RD, persistence (P), SD and CO scores, compared to the non-addicted group in 2012. Conclusion : Our results suggested that prevalence of internet addiction has de-creased among adolescents in Korean, but the temperament and character of adolescents with internet addiction seems to have adopted patterns similar to those of substance-based addictions.
김윤중 ( Youn Joong Kim ),이영부 ( Young Boo Lee ),박병규 ( Buung Kyu Park ),이정후 ( Joung Hoo Lee ) 한국광물학회 2004 광물과 암석 (J.Miner.Soc.Korea) Vol.17 No.2
Measurements of the lattice parameters of albite and oligoclase from electron diffraction patterns with the Au internal standard resulted in errors of less than 1%. An electron diffraction map for natural oligoclase samples was constructed and 11 stations of zone-axes diffraction patterns were obtained. This process is indispensible for reliable TEM studies of triclinic feldspars. Utilizing the {001} cleavage plane of feldspar and the double-tilting TEM holder the following information is obtainable: Si-Al ordering and chemistry of alkali feldspars could be estimated from the α^* - ν^* plot, where ν^* is measured from the [001] orientation, while α^* is measured from the [100] orientation. Si-Al ordering of Na-rich plagioclase could be estimated from ν^* in [001] patterns. Structure and chemistry of Na-poor plagioclase could be estimated from existence of e-reflections, their intensity variations as well as their positional changes.
김윤중(Kim, Yoon Joong),김후성(Kim, Hoo Sung) 한국디자인문화학회 2016 한국디자인문화학회지 Vol.22 No.2
본 연구는 온라인의 소비자와 오프라인의 판매자를 연결해주는 플랫폼 기술인 O2O를 통해 새로운 서비스의 성격을 지닌 커피전문점 서비스 스케이프 디자인을 연구하였다. 연구의 목적으로는 현재 운영되고 있는 커피전문점 서비스 스케이프의 다양한 문제를 종합적으로 해결하기 위함으로, 소비자의 니즈에 초점을 맞추어 O2O 기술의 활용방안을 분석하였고, 이를 통해 기존의 서비스 스케이프보다 확장된 형태의 새로운 서비스 형식을 제안하여 차별화된 서비스 영역의 가능성을 알아보기 위함이다. 이를 위한 연구의 방법으로 인터넷 리서치와 문헌조사, 통계자료조사를 통한 커피전문점과 O2O 기술에 대한 자료수집과 현황 파악, 니즈 파악을 진행하였으며, 자료분석을 통한 기술 활용방안과 서비스 디자인 모델과 시나리오를 제안하였다. 또한, 서비스 스케이프의 문제점을 고객 편리성 문제, 공간 환경적 문제, 근무자 환경 문제의 3가지 범주로 분류하여 사례 조사를 통해 문제점을 추출하여 문제 해결을 제안하였다. 규모적인 서비스 스케이프 디자인인 점을 고려하여 연구의 범위는 프랜차이즈 커피전문점을 중심으로 진행하였고, O2O 기술에서의 범위는 Beacon(비콘), NFC(근접무선통신) 그리고 RFID(Radio Frequency Identification) 기술에 집중하여 진행하였다. 연구의 결론으로는, 현재 상용화된 O2O 기술 중 NFC와 Beacon을 중심으로 새로운 서비스 모델을 디자인하였으며, 서비스 모델의 진행 방식을 아이콘의 형식으로 구성하여 제안하였다. 이를 통해 문제점을 해결할 수 있는 시스템을 제시하여 다양한 이점을 분석하였다. This study investigated the service scape design of coffee shops that has the characteristics of new service through O2O, the platform technology that connects consumers online and sellers offline. The objective of the study is to comprehensively solve various problems of service scape that the currently run coffee shops are facing. For doing this, the study analyzed the utilization method of O2O technology focusing on the needs of consumers, and proposed the new service type in an extended form that the existing service scape did not have in an aim to examine the possibility of differentiated service area. For the study methods, collection of data and investigation of the current situation and needs of the coffee shops and O2O technology were conducted through the Internet research, literature review, and statistical data investigation. Through data analyis, the study suggested the technology Additionally, categorizing the problematic spectrum into three classes - consumer convenience problems, spatial/ environmental problems and employee environment problems, a case study was conducted to extract information on the problems after which solutional suggestions were made. Considering that it is a service scape design with a scale, the range of the study focused on the franchise coffee shops, and the range of O2O technology focused on Beacon, NFC(Near Field Communication) and RFID(Radio frequency identification). In conclusion to the case studies, focus was directed on NFC and Beacon - compository elements of the currently commercialized O2O technology - and a new service model was designed through which a solution system was proposed that allowed analysis of diverse vantage points for solving the extracted problems.