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질화 분위기에서 결정화 된 Fe_(73.5)Si_(13.5)B_(9)Cu₁Nb₃ 연자성 합금의 자기적 성질
이기선,박인수,이기안,김문철,장석훈 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.11
Amorphous Fe_(73.5)Si_(13.5)B_(9)Cu₁Nb₃ alloy was crystallized in nitriding atmosphere of mixture gas of NH₃ and hydrogen. The crystallization at 823K showed the high electrical resistivity ranging from 494 to 538 mW-cm, which was higher level compared with nano-crystalline Fe_(73.5)Si_(13.5)B_(9)Cu₁Nb₃ alloy with a resistivity of about 110 mW-cm. Through the nitridation treatments, the amorphous alloy was transformed into nano-sized crystalline Fe3Si including iron nitrides such as γ' -Fe₄N phases. EPMA-concentration depth profiles confirmed an existence of nitrogen-rich region on the surface of the alloy ribbon, leading to the preferential formation of g -Fe4N phase. The formation of γ' -Fe₄N phase leaded to an increase of the resistivity and provided stable permeability and a low core loss at high frequency.
연구논문 : 한국의 사회적 자본과 갈등: 사회적 자본의 다면적 속성에 대한 재조명
장용석 ( Yong Suk Jang ),정장훈 ( Jang Hoon Jeong ),조문석 ( Mun Seok Cho ) 한국조사연구학회 2009 조사연구 Vol.10 No.2
본 연구는 다원화된 한국사회의 사회통합 및 갈등해소를 위한 방안을 사회적 자본에서 찾고자 하였다. 이를 위해 사회적 자본을 (1) 일반적 타자에 대한 신뢰, (2) 국가 공공영역에 대한 신임, (3) 연줄망과 연결망을 포괄하는 네트워크, (4) 공동체 의식으로 구분하였고, 사회적 자본이 잠재된 갈등의식을 나타내는 갈등잠재지수에 어떤 영향을 미치고 있는지를 실증적으로 분석하여 다음과 같은 사실을 발견하였다. 첫째, 일반적 타자에 대해 신뢰가 높은 사람은 사회통합 지향적 경향을 보여 주었다. 둘째, 국가 공공영역의 절차적 공정성 및 민주적 운영을 신뢰하고 있는 사람들 역시 사회통합 지향적 경향을 보여 주었다. 하지만 특정 정권에 대해 신뢰가 높은 사람은 오히려 갈등 지항적 경향을 보여주었다. 셋째, 폐쇄적 연줄망을 활용하는 사람들은 갈등지향적인 반면, 개방적 연결망을 활용하는 사람들은 사회통합 지향적이었다. 넷째, 공동체규범의 내면화 정도는 사람들의 사회 통합적 지향성과 아무런 관련이 없었다. 이러한 결과들이 갖는 함의는 다음과 같다. 다원화된 한국사회의 실질적 사회통합을 위한 사회적 자본은 학연, 혈연 지연과 같은 전통적인 폐쇄적 연결망에 기반한 것이 아니라, 익명의 일반적 타자들에 대한 신뢰와 느슨하게 연결된 개방적 연결망에 기반해야 한다. 또한 실질적 사회통합은 공정한 국정운영 시스템에 대한 신임에 기초해야 하는 것이지, 특정 기관 혹은 정파에 대한 맹목적 신뢰에 기초해서는 안 된다. This paper explores how multiple facets of social capital in Korea affects social conflict. The notion of social capital is composed of several elements including (1) social trust in generalized others (2) confidence in public sector fairness and the principles of democracy (3) social networks and closures and (4) community spirit and collective norms. We particularly examine how these multiple dimensions of social capital affect an individual`s tendency of social conflict orientation. The findings address the following four points. First, an individual, who trusts generalized others in a society, is less likely to be exclusive and conflict-oriented. Second, the more an individual has confidence in the efficacy of democratic processes and public sector fairness, the more (s)he is likely to be social integration oriented. When an individual, in contrast, gives strong support to a particular party (or government in power), the person is more likely to be conflict oriented. Third, an individual who mobilizes exclusive social closures to solve a problem is more likely to be conflict oriented. However, an individual who maintains a variety of inclusive social networks is more likely to be social integration oriented. Finally, the internalization of collective norms does not affect directly the tendency of individual`s social conflict orientation. Increasing social capital at the individual level does not automatically guarantee societal level conflict resolutions. Rather, building extensive social closures based on strong family or hometown ties, school connections, political interests has detrimental effects on social integration and conflict resolutions. More, constructive social integration in a society requires higher level of open social networks, consistent administrative and democratic procedures, and social trust in generalized others.
김경희,이종훈,김무현,박태호,한상영,송경하,신우원,노명환,장진석,문성훈,장세준,최석렬,노미숙 대한내과학회 2002 대한내과학회지 Vol.62 No.2
Cytomegalovirus (CMV) infection is more frequent in immunocompromised patients those with acquired immunodeficiency syndrome (AIDS), malignant disease, steroid therapy. However, CMV can infect a healthy person who has normal immunity. Most cases of CMV infections are due to reactivation of latent virus. We report a case of cytomegalovirus colitis in a 73 years old woman who has congestive heart failure with normal immunity. Sigmidoscopy reveals cobble stone like mucosa and deep ulceration. CMV infection produces a cytomegalic cell containing a intranuclear inclusion, which is surrounded by clear halo in Hematoxylin-Eosin stain. Immunohistochemical stain for CMV reveals focal positive in cytoplasm and in nuclei of large cells. We diagnosed CMV colitis with histopathologic finding and immunohistochemistry through sigmoidoscopic mucosal biopsy.(Korean J Med 62:218-222, 2002)
Jang, Mun-Sun,Oh, Se Kwang,Lee, Suk Woo,Jeong, Seong-Hae,Kim, Hoon Elsevier 2019 The American journal of emergency medicine Vol.37 No.10
<P><B>Abstract</B></P> <P><B>Aim of the study</B></P> <P>No definitive experimental or clinical evidence exists whether brain hypothermia before, rather than during or after, resuscitation can reduce hypoxic-ischemic brain injury following cardiac arrest/cardiopulmonary resuscitation (CA/CPR) and improve outcomes. We examined the effects of moderate brain hypothermia before resuscitation on survival and histopathological and neurobehavioral outcomes in a mouse model.</P> <P><B>Methods</B></P> <P>Adult C57BL/6 male mice (age: 8–12 weeks) were subjected to 8-min CA followed by CPR. The animals were randomly divided into sham, normothermia (NT; brain temperature 37.5 °C), and extracranial hypothermia (HT; brain temperature 28–32 °C) groups. The hippocampal CA1 was assessed 7 day after resuscitation by histochemical staining. Neurobehavioral outcomes were evaluated by the Barnes maze (BMT), openfield (OFT), rotarod, and light/dark (LDT) tests. Cleaved caspase-3 and heat shock protein 60 (HSP70) levels were investigated by western blotting.</P> <P><B>Results</B></P> <P>The HT group exhibited higher survival and lower CA1 neuronal injury than did the NT group. HT mice showed improved spatial memory in the BMT compared with NT mice. NT mice travelled a shorter distance in the OFT and tended to spend more time in the light compartment in the LDT than did sham and HT mice. The levels of cleaved caspase-3 and HSP70 were non-significantly higher in the NT than in the sham and HT groups.</P> <P><B>Conclusions</B></P> <P>Moderate brain hypothermia before resuscitation improved survival and reduced histological neuronal injury, spatial memory impairment, and anxiety-like behaviours after CA/CPR in mice.</P>
Mun, Hyung-Suk,Jang, Chang-Doo The Korean Society for Railway 2009 International Journal of Railway Vol.2 No.4
The welding deformation and its prediction method at the HAZ (Heat-Affected Zone) are presented in this paper. The inherent strain method is well known as analytical method to predict welding deformation of large scale welded structure. Depend on the size of welding deformation in welding joints, the fatigue life, the stress concentration factor and the manufacturing quality of welded structure are decided. Many welded joints and its manufacturing control techniques are also required to railway rolling stock and its structural parts such as railway carbody and bogie frame. Proposed methods in this paper focus on the two different the inherent strain area at HAZ. This is main idea of proposed method and it makes more reliable result of welding deformation analysis at the HAZ.