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신정헌,Young Kim,김정철,Sangho Sohn,Kong Hoon Lee,윤석호 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
Brazing bonding of iron-chromium-aluminum alloy (Fecralloy) with nickel based filler metal (MBF20) were performed at different maximum temperatures, 1000 °C and 1100 °C by varying the rate of temperature rise, 5 °C/min and 10 °C/min. And for comparison, diffusion bonding of Fecralloy-Fecralloy was also done with a condition, 1000 °C and 10 °C/min. For testing the tensile strength, the prepared tensile strength specimens were just bonded for diffusion bonding, and filler metal was inserted between the half specimens for brazing bonding. And in order to visually investigate about the bonding conditions, channeled heat plates were also prepared. The dimension of Fecralloy plates was 49 mm × 24 mm × 2 mm thick with three 2 mm diameter channels and 60 μm thick MBF20 was used as filler metal. The cross section parts of the test specimens were analyzed with SEM (XRD, EDS, EPMA, BSE) images, which were image processed to quantify the penetration depth of both filler and base metals to counter materials and components distribution using image processing. And such quantified results were compared with the tensile strength. From the both analysis, the tensile strength results were correlated with the change of thickness of filler metal as well as the distribution of components at the different bonding conditions.
Fracture in a Young Male Patient Leading to the Diagnosis of Wilson’s Disease: A Case Report
신정헌,이준표,나중호 대한골대사학회 2015 대한골대사학회지 Vol.22 No.1
Wilson’s disease is a rare genetic disorder that has abnormal copper metabolism. Although the disease’s main problems are found in liver and brain, some studies revealed manifestation of various musculoskeletal problems in the patients. In this report, we encountered a young patient who had fracture in the forearm bone. Initially, exception to a previous history of fracture from a motorcycle accident, the patient did not have any medical or drug use history, and laboratory work-ups were insignificant. However, with suspicion on his bone’s integrity, bone densitometry was recommended and revealed osteopenic change. To disclose a cause for the change, questions were made to recall any particular history or event, and his complaint of recent vision loss led to ophthalmologic consultation where under slit-lamp test found Kayser-Fleischer ring. Further laboratory work-up found low levels of serum copper and ceruloplasmin and high copper level in 24-hr urine sample that led to the diagnosis of Wilson’s disease. Although Wilson’s disease has been frequently noticed with considerable musculoskeletal manifestation, it rarity makes the diagnosis illusive to a physician. Hence, despite of its rarity, it is imperative to remember the disease’s bony manifestation, and it should be suspected in young patients with demineralized bone when the reason for brittle bone cannot be answered with other better known conditions.
신정헌(Jeongheon Shin),김신혜(Shinhae Kim),라진호(Jinho Na),이정희(Chunghi Lee),배현철(Hyunchul Bae) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper proposes the head lamp control system using GPS for safety at night time driving. Proposed system improve night time driving sight by means of using current driving situation and environment information through front camera module, GPS module and ECU(Electronic Control Unit) in vehicle. The system implements ECU type hardware and software, especially hardware and software could be reused by standardization activity of AUTOSAR software platform.
중등학교장의 진정성 리더십, 긍정심리자본, 조직동일시, 학교조직효과성 간의 구조적 관계 분석
신정헌 ( Shin Jung-heon ),엄준용 ( Um Jun-yong ) 안암교육학회 2021 한국교육학연구 Vol.27 No.4
본 연구의 목적은 중등학교 교사들이 지각하는 학교장의 진정성 리더십, 긍정심리자본, 조직동일시, 학교조직효과성 변인 간의 구조적 관계를 규명하는 데 있다. 이를 위하여 본 연구에서는 선행연구에 대한 검토를 바탕으로 4개의 변인간 구조방정식모형을 설정하고, 경기도 중·고등학교 교사들을 대상으로 한 설문조사를 통해 수집된 자료를 바탕으로 분석을 실시하였다. 분석 결과는 다음과 같다. 첫째, 학교장의 진정성 리더십, 긍정심리자본, 조직동일시가 학교조직효과성에 유의한 영향을 미치는 것으로 나타났다. 따라서 학교장의 진정성 리더십이 높을수록, 긍정심리자본과 조직동일시가 높을수록 학교조직효과성도 높아진다. 둘째, 학교장의 진정성 리더십이 긍정심리자본과 조직동일시에 유의한 영향을 미치는 것으로 나타났다. 따라서 학교장의 진정성 리더십이 높아질수록 긍정심리자본과 조직동일시도 높아진다. 셋째, 긍정심리자본이 조직동일시에 유의한 영향을 미치는 것으로 나타났다. 넷째, 학교장의 진정성 리더십과 학교조직효과성의 관계에서 긍정심리자본과 조직동일시의 매개효과가 확인되었으며, 직접효과보다 긍정심리자본 및 조직동일시를 매개로 한 간접효과가 더 큰 것으로 나타났다. The purpose of this study is to investigate structural relations among principal’s authentic leadership, positive psychological capital, organizational identification and school organizational effectiveness perceived by secondary school teachers. For this purpose, we conducted an online and offline survey with middle and high school teachers in Gyeonggi Province and structural equation model analysis to test direct and indirect effects among the variables. The findings were summarized according to the research questions as follows: First, the study analyzed the effects of principal’s authentic leadership, positive psychological capital, and organizational identification on school organizational effectiveness and found that principal’s authentic leadership, positive psychological capital, and organizational identification had significant effects on school organizational effectiveness. Secondly, the study then analyzed the mediating effects of positive psychological capital and organizational identification on relations between principal’s authentic leadership and school organizational effectiveness and found that positive psychological capital and organizational identification played mediating roles in relations between principal’s authentic leadership and school organizational effectiveness. Thirdly, Principal’s authentic leadership had greater indirect effects on school organizational effectiveness via positive psychological capital and organizational identification than direct effects on it. Furthermore, positive psychological capital and organizational identification played dual mediating roles in relations between principal’s authentic leadership and school organizational effectiveness.