Microstructure and High Temperature Mechanical Property of Fe–Cr–B Based Metal/Ceramic Composite Manufactured by Metal Injection Molding Process

Kee‑Ahn Lee,Jin‑Han Gwon,윤태식 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.2

This study investigated the microstructure and the room and high temperature mechanical properties of Fe–Cr–B alloy manufacturedby metal injection molding. In addition, hot isostatic pressing was performed to increase the density of the material,and a comparison of properties was made. Microstructural observation confirmed a bi-continuous structure composedof a three-dimensional network of α-Fe phase and (Cr,Fe)2B phase. The HIPed specimen featured a well-formed adhesionbetween the α-Fe phase and boride, and the number of fine pores was significantly reduced. The tensile results confirmed thatthe HIPed specimen (RT to 900 °C) had higher strengths compared to the as-sintered specimen, and the change of elongationstarting from 700 °C was significantly greater in the HIPed specimen. Fractography suggested that cracks propagatedmostly along the interface between the α-Fe matrix and boride in the as-sintered specimen, while direct fracture of boridewas observed in addition to interface separation in the HIPed specimen.

요 검사용 스트립의 분광학적 분석을 위한 Computer Simulation

김성철,진병문,김재형,김정배,조진욱,전계록,이승진,김건우 동의대학교 기초과학연구소 1999 基礎科學硏究論文集 Vol.9 No.1

The spectroscopic properties of 9 pads in a urine strip were studied to develop a urine analysis system. From the present work, we determined the wavelength range which could accurately distinguish the degrees of 9 test items. A computer simulation was performed to distinguish the primary color reaction in the urine strips by using the reflectance of the urine strips, the iuminous intensity of light-emitting diodes, and the spectral sensitivity of photodiodes. The simulation results agree well with the experimental results obtained by using a UV-Visible spectrophotometer.

한국 정신장애의 역학 조사 연구[I] : 각 정신장애의 유병률

조맹제,함봉진,김장규,박강규,정은기,서동우,김선욱,조성진,이준영,홍진표,최용성,박종익,이동우,이기철,배재남,신정호,정인원,박종한,배안,이충경 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.4

Objectives : This study aims to estimate the prevalence of the DSM-IV psychiatric disorders in Korean population using the Korean version of Composite International Diagnostic Interview (K-CIDI). Methods : Subjects were selected by taking multi-stage, cluster samples of 7,867 adult household residents, 18 to 64 years of age, in ten catchment areas. Total 78 trained interviewers administered the K-CIDI to the selected respondents, from June 1 to November30,2001. Results : Total 6,275 respondents completed the interview. Some 33.5% of respondents reported at least one lifetime disorder, 20.6% reported at least one-year disorder, and 16.7% reported at least one-month disorder. The most common lifetime disorders were alcohol abuse/dependence (17.24%), nicotine dependence/withdrawal (11.19%), specific phobia (5.16%), and major de-pressive disorder (4.25%). The lifetime prevalence of substance abuse/dependence (0.25%) and schizophrenia (0.16%) was very low. Nicotine and alcohol use disorder showed very high male/female ratio. Mood disorder and anxiety disorder were more prevalent among female than male. Conclusion : The prevalence of psychiatric disorders was high. In comparison with other studies, remarkable differences in distributions of psychiatric disorders across the areas and times were observed.

한국산 바질(Ocimum basilicum L.)의 휘발성 성분

이재곤,안대진,곽재진,장희진,정기택,이종철 한국식품영양학회 1999 韓國食品營養學會誌 Vol.12 No.5

동시증류추출장치를 사용하여 분리한 Sweet계 바질(Ocimum basilicum)의 4개 품종(anise, darkopal, lettuce, sweet)의 휘발성 성분을 GC/MSD로 확인하였다 확인된 성분을 기능기별로 분류하면 alcohol 성분들이 11종, carbonyl 화합물이 6종, terpene 관련 화합물이 19종. ester 화합물이 5종으로 나타났다. 주요 화합물들은 1,8-cineole(2.86∼5.04%), camphor(1.07∼l.87%), α-Bergamotene(2.05∼5.40%), methyl chavicol(0∼25.49%), eugenol (3.55∼13.53%) 등의 carbonyl 화합물과 linalool(28.52∼36.50%), bornyl acetate(0.48∼2.79%), methyl cinnamate(0∼23.12%)등의 alcohol과 ester류, cis-ocimene(1.15∼2.02%), β -cubebene(2.77∼4.80%), cadinene(1.08∼1.70%)등의 terpene 화합물이 주요 성분으로 확인되었다. Darkopal, lettuce, sweet 바질은 linalool(30.09∼35.50%), methyl chavicol(8.09∼25.49%)이 주요 성분으로 나타났고, Anise 바질은 linalool(28.52%), methyl cinnamate(23.12%)가 주요 성분으로 확인되었으나 바질의 주요성분으로 알려져 있는 methyl chavicol은 검출되지 않았다. The essential oils of anise, darkopal, lettuce and sweet basils cultivated in Korea were extracted by simultaneous steam distillation and extraction method and were analyzed by GC/MSD. Total 41 components were identified in essential oils including 11 alcohols, 6 carbonyls, 19 hydrocarbons and 5 esters components. The major components were 1,8-cineole, linalool, α-bergamotene, β-elemene, methyl chavicol, β-cubebene, methyl cinnamate and eugenol. Darkopal, lettuce and sweet basils were rich in linalool(30. 1∼36.5%), methyl chavicol(8.1∼25.5%) and relatively poor in methyl cinnamate(0∼2.71%). Anise basil was rich in linalool(28.5%) and methyl cinnamate(23.1%). However, methyl chavicol, which was known as one of the main components of basil, was not detected.

안구적출에 따른 위둔덕의 Calbindin D-28k과 c-fos의 변화에 관한 연구

김명,김기훈,김주영,하현철,안명수,김장민,조향훈,정명섭,장인엽 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.2

Changes of Calbindin D-28k- and c-fos-immunoreactivities in the superior collicuclus after Eye Enucleation. Objective and methods: Calcium-binding proteins (CBPs) play an important role in the protection, differentiation and reorganization of the central nervous system. The effects of neonatal retinal deafferentation on a CBPs, calbindin D-28k were examined immunohistochemically in the superficial layer of the rat superior colliculus. Also early gene familly c-fos was examined to evaluate the neuronal characteristics in the superior colliculus after monocular enucleation. Results: On the experimental side of superior colliculus, the number of calbindin D-28k-immunoreactive (IR) cells was reduced (77.4% compared to control), but not fibers. Appearance of c-fos-like immunoreactivity was represented much more in the ipsilateral superior colliculus than contralateral side within 24h after eye enucleation. Conclusion: These results suggest that the changes of retinotectal projection may alter the expressional pattern of calbindin D-28k and c-fos expression.

칸트와 헤겔의 사회윤리사상 연구

진기행 釜山 外國語 大學校 1998 外大論叢 Vol.18 No.2

The main purpose of thos thesis is to study the Kant and Hegel's understanding about Social Ethic by surveying how they analyzed ethical problems of modirn society. In spite of Kant's marvelous analysis of liberty and ethice, his theory also contained the fatal limitation, dualistic way of thonking. Because of this, it was criticised by hegel's philosophical system. Hegel presented an idealistic worldview as the man's independent priniciple of the ethical life. He suggested that unification of idea and reality ws key to reaching the realm of freedom as self-realization. Despite his attempt to picture modern society as a unity of monism, his philosophical was partly rejected due to several idealogical limitations. The modern Social Ethics developed by Knat and Hergel have not been completed yet, but it still needs our continuous research and studies to find best principle of solving modernity's inevitable ethical problems.

光州ㆍ大田地域 서비스산업의 構造分析

奇聖來,金陣洙 大田工業大學 1992 한밭대학교 논문집 Vol.9 No.2

In the future of the industrial society, the demand of soft section trends increasingly than that of hard section, owing to the diversification of national life and change of the international situation, The propotion of the service industries to the GDP is rated 6% at the present 1991 in Korea. In the point of views, this study analyzed comparatively structure of the service industries which the economic environment is smilar in Kwangju and Taejon. The main contents of this study are as follows : In chapter Ⅱ, it is presumed population of the future by time-series of Kwangju-Taejon. It is analyzed the change of structure, wage and employment in the service industries at two rigions. In chapter Ⅲ, it is analyzed the structure of the service industries by using LQ (locational quotient)and shift -share analysis. According to LQ analysis, Kwangju was very specialized a land carrige and Taejon a communications service. According to shift-share analysis, the state of the industrial structure was relatively good for industrial mix effect, but the external competitive power appeared very weak in Kwangju. The service industries in Taejon will be highly-specialized because the effect of the net employment change and regional share effect was increased. On the other hand, the section of the financial business was relatively weak. As a results, the provincial government should establish the policy, improve the system for rearing of the service industries.

상악 전치부 견인시 치근 흡수 발생 양상에 관한 연구

기세호,이진우,차경석 대한치과교정학회 1996 대한치과교정학회지 Vol.26 No.4

본 연구는 상악 전돌증을 보이는 환자에게서 상악 제 1 소구치를 발치한 후 견인시 bracket 종류에 따른 치근흡수 차이, 이동양상에 따른 치근 흡수 차이, 각 치아간에 따른 전치부의 치근 흡수 정도를 연구하기 위해 단국 대학교 부속 치과 병원 교정과에 내원한 남녀 환자 32명을 대상으로 연구하여 다음과 같은 결과를 얻었다. 1. 상악 전치 후방 견인시 치근 흡수를 보이지 않는 것은 31.77%, 약간의 흡수는 33.33%, 치근의 1/4이하 흡수는 23.96%, 1/4이상은 10.94%를 보였다. 2. Apical tipping, Lingually bodily movement, ant-post apical displacement의 세가지 이동 양상은, 치근 흡수와의 상관 관계에 유의한 차이를 보이지 않았다. 3. Standard br.을 사용한 환자는 많은 치축 변화를 보이고 치근첨의 이동은 적었으나, straight br.을 사용한 환자는 적은 치축 변화를 보이고 치근첨의 이동량은 많았다. 4. Standard br.과 straight br.의 치근흡수에서 standard br.을 사용한 환자가 더 많은 치근 흡수를 보였다. 5. Standard br.을 사용시 치근 흡수정도는 2>1>3=0순을 보이고, straight br.을 사용시에는 0>1>2>3으로 나타났다. This study was carried out in order to find out the pattern of the root resorption following maxillary incisor retraction after maxillary 1st bicuspid extration in maxillary protrusion patients. For this study, thirty two patient who received orthodontic treatment were chosen. The results were as follows; 1. Of the total 192 teeth, 61 teeth(31.77%) showed no apical root loss, 64 teeth(33.33%) fell into the class "slight", 46 teeth(23.96%) fell into the class "moderate". Only 21 teeth(10.94%) were classified as "excessive". 2. No correlation was noted between the amount of apical root loss and the types of tooth movement of the maxillary central incisors. 3. The patients who were treated with standard brackets had more changes in tooth axis and less movement of root apexes, but the patients with straight brackets has less changes in tooth axis and more movement of root apexes. 4. Comparing the degree of root resorption between bracket types, patients who had used standard brackets showed more apical root loss than patients who had used straight brackets. 5. The most frequent degree of root resorption observed in standard bracket patients was second degree, followed by first degree and third degree. The most frequent degree of root resorption observed in straight bracket patients was zero degree, followed by first, second degree and third degree.

末梢神經腫瘍에서 GFAP의 免疫組織化學的 表現에 關한 硏究

기근홍,조국형,범진선 朝鮮大學校 附設 醫學硏究所 1992 The Medical Journal of Chosun University Vol.17 No.2

Glial fibrillary acidic protein (GFAP) is one of the intermediate filament proteins, It is avaUable for identification of tumors glial cell origin in central nervous system. The specialized cells of the peripheral nervous system could express GFAP. The materials for our study consisted of 25 neurofibroma and 15 neurilemmoma, that resected for diagnosis or definite treatment at Chosun University Hospital from January, 1989 to December, 1991. All cases were performed of immunohistochemical stain for GFAP, vimentin and S-100 protein by ABC method. Immunoreactivity was evaluated and compared with the reactivity of GFAP, vimentin and S-100 protein. All cases of neurofibroma and neurilemmoma was positively stained in the neoplastic cells to the vimentin and S-100 protein. GFAP were positively stained in 10 of 25 neurofibroma (40%) and 11 of 15 neurilemmoma (73%). In the neurilemmoma, the positive cells were found primarily in cellular area, rarely in verocay bodies. Dermal neurofibromas were negative for GFAP, except of deeply located plexiform neurofibromas. Positive tumor cells were usually bipolar and spindle-shaped. The GFAP positive tumor cells were appeared around in hyalinized vessels in many cases.

대중음악의 문화적 가치에 관한 연구

진기행 부산 외국어 대학교 2003 外大論叢 Vol.26 No.-

The purpose of this paper is to explore the ground-making in the field of popular music among popular culture, primarily dealing with the true meaning of definition of popular music, the essence of popular music, and the historical process of popular music. After that popular muic is substantially compared with classical music to demonstrate the value through classical music. Furthermore justification for existence is clearly declared through the contradiction of popular music, I'd say commercialism and authenticity. Besides it calls upon scholars and readers to give attention to the significance and the necessity of popular music particulary unexplored in Korea. Finally writer urges them to do deeper level of research to appreciate the substantial cultural value of popular music.