광섬유 ( Optical Fiber ) 의 Impulse Response 측정에 대한 연구

조재철,최상삼 대한전자공학회 1979 대한전자공학회 심포지엄 논문집 Vol.- No.-

Clinical interpretation of positive M-spike

조재철 대한내과학회 2018 대한내과학회 춘계학술대회 Vol.2018 No.-

LDPE의 전하이동과 전계발광 현상

조재철,최용성,문성창,황종선,이경섭 대한전기학회 2008 전기학회논문지 P Vol.57 No.3

Polymers submitted to thermo/electrical stress suffer from ageing that can drastically affect their functional behaviour. Understanding the physico/chemical processes at play during ageing and defining transport regimes in which these mechanisms start to be critical is therefore a prime goal to prevent degradation and to develop new formulation or new materials with improved properties. It is thought that a way to define these critical regimes is to investigate under which conditions (in terms of stress parameters) light is generated in the material by electroluminescence (EL). This can happen through impact excitation/ionization involving hot carriers or upon bi-polar charge recombination (a definition that excludes light from partial discharges, which would sign an advanced stage in the degradation process). After a brief review of the EL phenomenology under DC, we introduce a numerical model of charge transport postulating a recombination controlled electroluminescence. The model output is critically evaluated with special emphasize on the comparison between simulated and experimental light emission. Finally, we comment some open questions and perspectives.

멀티센서를 이용한 다수 변압기의 온라인 모니터링의 현장 적용

조재철,최용성,문성창,황종선,이경섭 대한전기학회 2008 전기학회논문지 P Vol.57 No.3

On-line condition monitoring is a useful tool for maintaining and extending the longevity of power transformers. An intelligent diagnostic system is desirable for operational safety and reliability. Bringing these concepts together results in a powerful support tool for engineers, reducing the volume of data to deal with, and making the data more meaningful. This paper describes how a multi-agent system for diagnosing the cause of transformer partial discharge activity was coupled with a method of UHF partial discharge monitoring, creating an on-line condition monitoring system. The challenges presented by the on-site environment are discussed, along with the implications for the complete system.

성인 ADHD 성향이 자아존중감과알코올 중독에 미치는 영향

조재철,김진숙 국제문화기술진흥원 2018 The Journal of the Convergence on Culture Technolo Vol.4 No.1

본 연구는 성인 ADHD 성향이 자아존중감과 알코올 중독에 미치는 영향을 알아보는데 그 목적이 있다. 이를 위하여 대구광역시 및 경상북도에 소재하고 있는 성인 433명을 대상으로 한 결과는 다음과 같다. 첫째, 성인ADHD 성향에 따라 자아존중감과 알코올 중독의 차이를 알아본 결과, 자아존중감과 알코올 중독의 하위요인에서 모두 유의한 차이가 있었으며, 성인 ADHD가 높을수록 자아존중감의 상위집단의 점수가 낮았고, 알코올 중독은 상위집단의 점수가 높았다. 둘째, 성인 ADHD 성향과 자아존중감 및 알코올 중독의 상관관계를 알아본 결과, 자아존중감은높은 음의 상관관계를 보였고 알코올 중독은 낮은 양의 상관관계를 보였으며, 하위요인에 따라 차이가 있었다. 셋째, 성인 ADHD 성향이 자아존중감과 알코올 중독에 미치는 영향을 살펴본 결과, 하위요인에 따라 차이가 있었다. 따라서 성인 ADHD 성향이 자아존중감과 알코올 중독의 이차적인 문제에 영향을 미친다는 것을 알 수 있었다. 즉, 낮은자아존중감과 알코올 중독의 원인이 ADHD가 될 수 있고 이는 다각적이고 통합적인 예방과 치료프로그램 개발이 필요하다는 것을 시사한다. The purpose of this study is to investigate the effect of adult ADHD tendency on self-esteem and alcohol addiction. For this purpose, 433 adults in Daegu and Gyeongsangbuk-do were studied. The results were as follows. First, there was a significant difference between self-esteem and alcoholism according to adult ADHD tendency. There was a significant difference in both self-esteem and sub-factors of alcoholism. The higher adult ADHD, the lower score of high class in self-esteem, and the scores of the upper group were higher in alcohol addiction. Second, the correlation among adult ADHD tendency and self-esteem, and alcohol addiction was found. As a result, it showed a high negative correlation with self-esteem, low correlation with alcoholism, and sub-factors. Third, As a result of examining the effect of adult adhd tendency on self-esteem and alcoholism, There were differences according to sub-factors. Therefore, it was found that ADHD tendency affects self-esteem and secondary problem of alcohol addiction. In other words, low self-esteem and alcoholism can be causes of ADHD. And it suggests that multifaceted and integrated-prevention treatment programs need to be developed.

석임을 첨가한 오디와인의 품질 특성

조재철,강병남,이상정 한국외식경영학회 2014 외식경영연구 Vol.17 No.5

The objective of this study was to determine the quality and sensory characteristics of Mulberry wine using different levels of seokim(0.5%, 1%, 2%, 3% and 5%(w/w)) at each fermentation step. The pH of Mulberry wine was dramatically reduced according to fermentation period after 2 days and total acidity was shown dramatically increased. The sugar content was Mulberry wine decreased as fermentation period increased. The alcohol content of all samples were increased until the end of fermentation period. After 16 days of Mulberry wine fermentation within Seokim, the addition of 0.5%, 1%, 2%, 3% and 5% seokim resulted in alcohol content of 11.4%, 12.6%, 13.2%, 13.8% and 14.3%, respectively. Color a-values of the seokim significantly increased with longer fermentation period (p<0.05). The 3%, 5% sample showed the highest scores among all the samples for every sensory item. 본 연구는 오디에 석임을 각각 0.5%, 1%, 2%, 3% 그리고 5%를 첨가하여, 오디와인을 제조한 후 발효기간 동안 이화학적 특성의 변화를 측정하였다. 와인 발효과정 중 pH는 담금 직후부터 2일까지 급격히 감소하는 경향을 나타냈으며, 총산은 급격히 증가하였다. pH가 감소할수록 총산은 증가하는 경향을 나타내었다. 당도는 발효 직후부터 감소하는 경향을 보였다. 석임 첨가량에 따른 알코올 변화는 석임 첨가량이 증가할수록 알코올발효가 높게 이루어지는 것으로 나타내었으며, 모든 시험구가 최종일까지 알코올 함량이 증가된 것으로 나타내었다. 발효 2일에 증가폭이 높아 3.3-6.8%의 알코올 함량을 보였고, 특히 석임 첨가 3%, 5%가 6.0%, 6.8%로 증가폭이 높게 나타내었다. 발효 16일째 석임 첨가 0.5%, 1%, 2%, 3% 그리고 5% 와인이 11.4%, 12,6%, 13.2%, 13.8% 그리고 14.3%의 알코올 함량을 나타내었다. 색도는 석임첨가량이 많을수록 a 값은 유의적으로 높은 값을 나타내었다(p<0.05). 오디첨가 관능평가결과는 3%, 5% 첨가와인이 다른 시료보다 높은 점수를 나타내었다.

Anionic Copolymerization of Styrene and 1- [ 4- ( N , N - bis ( trimethylsilyl ) amino ] phenyl ] -1- phenylethylene

조재철,조원호,윤혜성,안병인,김정안,박태석,김광웅 한국고분자학회 1995 한국고분자학회 학술대회 연구논문 초록집 Vol.1995 No.10

반강접 접합부의 요소인 개량 T-stub의 비탄성 해석과 약산식

조재철,김원기,이명재,Cho, Jae Chul,Kim, Won Ki,Lee, Myung Jae 한국강구조학회 1999 韓國鋼構造學會 論文集 Vol.11 No.3

보와 기둥과의 반강접에 관한 최근 연구로서 기둥 면과 T-stub 플랜지 사이에 격리재를 설치하는 개량된 T-stub 요소를 개발하고 있다. 개량된 T-stub에 대한 비탄성 해석을 수행하였으며, 그 결과를 실험값과 비교 분석하였다. 비탄성 해석 방법은 기둥 면과 격리재 사이에 간격요소(gap element)를 적용하고, 고력볼트에 초기 응력을 부여하여 실험값과 잘 일치하는 결과를 보인다. 실무에서의 설계와 해석에 적용할 수 있는 약산식으로서 T-stub의 초기 강성도와 압축하중에 의한 소성내력에 관한 설계식을 제시한다. Recently, studies on semi-rigid beam-to-column connections have been done to develop a T-stub element with separators between column face and T-stub flange. In this paper, inelastic analyses for the improved T-stub element are performed, and their results are compared with existing experimental results. The inelastic analyses using gap elements between column face and the separator, and initial stresses at the high-tension bolts result in good agreement with experimental results. Simplified design methods estimating the initial stiffness and the strength of the semi-rigid connection for compression force are proposed.

병원내 심정지 환자의 심폐소생술로 인한 흉부 골격계 손상에 영향을 미치는 요인

조재철,서영우,김균무,이경우,최대해,장태창 대한응급의학회 2015 대한응급의학회지 Vol.26 No.5

Purpose: Rib and sternal fractures are common complications of chest compressions during cardiopulmonary resuscitation (CPR). The aim of this study is to investigate skeletal chest injuries following chest compressions and factors associated with skeletal chest injuries. Methods: A retrospective study was conducted for 10 years from January 2005 to February 2015. Skeletal chest injuries in patients who underwent computerized tomography (CT) after return of spontaneous circulation (ROSC) were analyzed. The exclusion criteria were patients with insufficient medical records, under 18 years old, traumatic cardiac arrest, and out-of-hospital cardiac arrest. Results: During the period 106 patients were included. The CT scan after ROSC showed that 47 patients (44.3%) had rib fractures, and 20 patients (18.9%) had sternal fractures. The rib fracture group showed higher age (73 vs 61, p<0.001), longer CPR time (10 vs 6 min, p<0.001), and higher incidence of sternal fracture (34% vs 6.8%, p<0.001). The sternal fracture group showed longer CPR time (10 vs 7, p<0.05) and higher incidence of rib fractures (80% vs 4.7%, p<0.001). In multivariate logistic regression analysis, age (OR 1.087; 95% CI 1.041 to 1.134, p<0.001), CPR time (OR 1.200; 95% CI 1.087 to 1.323, p<0.001), and sternal fracture (OR 4.524; 95% CI 1.259 to 16.697, p=0.021) showed significant association with rib fracture. Conclusion: Rib and sternal fractures are frequent complications in patients who underwent CPR. In hospital cardiac arrest patients with older age, longer CPR time, and sternal fracture needed more precaution for rib fractures and other complications.

21 세기를 대비한 외국어 교육 정책의 방향 : 미국의 Education Rilinnue 논쟁을 중심으로 En lomo debate de la education bilingue en los EE. UU.

조재철 한국서어서문학회 2000 스페인어문학 Vol.16 No.1

algunas direcciones de la politica de las lenguas extranjeras para el siglo XXI. La poli'tica de lenguas extranjeras siempre ha sido una reflexio'n de cede e'poca en su filosofi'a. y caracteri'sticas, y ha sido determinada por las necesidades de aquel entonces. Este estudio comienza con las definiciones y clasificaciones sobre la educacio'n bilingu¨e y la inmersio'n que han sido implementadas en los Estados Unidos y en Canada'. A continuacio'n se investigan las evaluaciones positivas y negatives sobre la educacio'n bilingu¨e en torno al debate de la educacio'n bilingu¨e en los EE,UU, que fue provocado de nuevo por la aprohacio'n de la Proposicio'n 227 en California, E'sta contiene la regulacio'n que prohibe la educacio'n bilingu¨e en las escuelas pu'blicas de California y fue aprobada a pesar EE,UU. para entender la situacio'n y el contexbo del debate, Had dos movimientos histo'ricos sobre la poli'tica de las lenguas: uno a favor de la educacio'n bilingu¨e, y otro contra e'sta, Hen sido los ejes principles para la decisio'n de la poli'tica de las lenguas. Luego, hemos observado la historia del de las lenguas extranjeras para el silo XXI: debemos empezar la educacio'n bilingu¨e en Corea, Ya que primero, las lenguas extranjeras son recursos importantes para el futuro de Corea y deben ser bien cultivados por esta educacio'n. lenguas extranjeras de Corea : mero adquirir las destrezas lingu¨sticas. Se debe dar la posibilidad de ofrecer una educacio'n bilingu¨e en algunas escuelas primarias que tienen el propo'sito especifico de educar en las lenguas extranjeras, Por u'ltimo, la educacio'n bilingu¨e es mejor que la ensen￣anza de las lenguas extranejras como lengua extranjera o segunda lengua.