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Development of Diamond-like Carbon Film as Passivation Layers for Power Transistors
Chang, Hoon,Lee, Hae-Wang,Chung, Suk-Koo,Shin, Jong-Han,Lim, Dae-Soon,Park, Jung-Ho The Korean Ceramic Society 1997 The Korean journal of ceramics Vol.3 No.2
Because of the novel characteristics such as chemical stability, hardness, electrical resistivity and thermal conductivity, diamond-like carbon (DLC) film is a suitable material for the passivation layers. For this purpose, using the PECVD, DLC films were synthesized at room temperature. The adhesion and the hardness of the DLC films deposited on Si an SiO2 substrate were measured. The resistivity of 5.3$\times$$10^8$$\Omega$.cm was measured by automatic spreading resistance probe analysis method. The thermal conductivities of different DLC films were measured and compared with that of phospho silicate glass (PSG) film which is commonly used as passivation layers. The thermal conductivity of DLC film was improved by increasing hydrogen flow rate up to 90 sccm and was better than that of PSG film. The patterning techniques of the DLC film developed using the RIE and the lift-off method to form 5$\mu\textrm{m}$ line. Finally, the thermal characteristics of the power transistor with the DLC film as passiviation layer was analyzed.
청소년의 휴대전화의존이 학교생활적응에 미치는 영향 -진로정체감의 매개효과를 중심으로-
이창훈 ( Lee¸ Chang Hoon ),김현수 ( Kim¸ Hyunsoo ) 한국가족사회복지학회 2021 한국가족복지학 Vol.68 No.3
본 연구의 목적은 청소년이 지각하는 휴대전화의존 정도가 학교생활적응에 어떠한 영향을 미치는지, 그리고 청소년이 지각하는 휴대전화의존 정도와 학교생활적응의 관계에서 진로정체감의 매개효과를 살펴보는 데 있다. 이를 위해 한국 아동·청소년 패널연구의 제6차 패널데이터인 중학교 3학년 학생 2,061명 중, 본 연구의 주제인 휴대전화의존도, 진로정체감, 학교생활적응과 관련된 각 문항에 성실하게 응답한 1,990명의 자료를 대상으로 분석을 실시하였고 그 결과는 다음과 같다. 첫째, 청소년이 지각하는 휴대전화의존도가 학교생활적응에 유의미한 영향을 미치는 것으로 나타났다. 둘째, 청소년이 지각하는 휴대전화의존도가 진로정체감에 유의미한 영향을 미치는 것으로 나타났다. 셋째, 진로정체감은 청소년이 지각하는 휴대전화의존도와 학교생활적응의 관계에서 부분매개효과를 가지는 것으로 확인되었다. 본 연구의 제언에서 연구 결과에 따른 시사점과 제한점을 제시하였다. The purpose of this study is to investigate the effects of mobile phone dependency perceived by adolescents on their adjustment to school life and the mediating effects of career identity on their influential relations. For this purpose, the study examined the data of 2,061 ninth graders in middle school from the sixth panel data of “Korean Children and Youth Panel Survey 2015,” selected the data of 1,990 that provided sincere answers to each of the items related to the topics of the study including mobile phone dependency, career identity, and adjustment to school life, and conducted the three-step mediated regression analysis by Baron and Kenny(1986). The analysis results were as follows: First, mobile phone dependency perceived by adolescents had significant effects on their adjustment to school life; secondly, mobile phone dependency perceived by adolescents had significant effects on their career identity; and finally, career identity had partial mediating effects on influential relations between mobile phone dependency perceived by adolescents and their adjustment to school life. The section of suggestions discussed the implications and limitations of the findings.
성창훈 ( Sung¸ Chang-hoon ),김선영 ( Kim¸ Sun-young ),송진규 ( Song¸ Jin-gyu ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
To study on the long-time deflections of Flat-plate slabs considering the removal time of shores, four specimens were manufactured. The days of removal of shores were 6, 12, 18, and 28 day. The current ACI Code and CEB-FIP(1990) Code for one-way slabs were compared with test results. 2 dimensional FEM program using the effective beam width model was applied to analysis of Flat plate slabs. The comparison of the current code with test results was that ACI Code was resemblant in long span but estimated low in short span and CEB-FIP( 1990) Code was estimated a little high at the early ages but was inclined to predict low as time goes on. Furthermore, FEM frame analysis using the effective beam model was reasonable to predict long-term deflections.
Langerhans Cell Histiocytosis of the Rib of an Adult Female Patient: a Case Report
Changhoon Oh,강우영,이옥준 대한자기공명의과학회 2020 Investigative Magnetic Resonance Imaging Vol.24 No.1
Langerhans cell histiocytosis (LCH) is generally considered a childhood disease that exhibits various nonspecific clinical and radiological manifestations that mimic infection or malignancy. Here, we present a case of LCH involving the rib in an adult patient. CT and MRI revealed an expansile lytic lesion with periosteal reaction on the left 8th rib, suggesting a malignant bone tumor. Surgical resection was performed and histopathological examination was consistent with LCH. Owing to its rare occurrence in adults and nonspecific aggressive features, LCH should be included in the differential diagnosis of an aggressive-appearing rib lesion in both adults and children.
Recovering Leadership through Preaching - Suggestions for Recovering the Power of Preaching
Changhoon Kim Presbyterian General Assembly Theological Seminary 2016 CHONGSHIN THEOLOGICAL JOURNAL Vol.21 No.-
In this study, I discuss what is required to recover the power of preaching from the perspective of a preacher. I attempt to present my view in two broad categories of the essential requirements and the preparation and the content of sermon. Of course, there are a number of requirements, which could be discussed from various aspects. However, due to the limit of space, I make my points and suggestions only very briefly. In summation, what is required of a preacher to restore the power of preaching is to solely depend on the Lord’s provision and guidance. Also, it is necessary for one to do his best in preparing a sermon that would please God and that is communicated the most effectively. I hope that this paper could offer a new challenge and practical help to the preachers and that the restored pulpit could contribute to transforming the crumbling Korean church to make a leap forward.