Controlled infiltration profile of SiC coating layer on graphite by Si vapor deposition reaction

Kuk-Jin Hwang,Si-Young Bae,Kyoung-Ho Kim,Yoon-Cheol Lee,Jung-Tae Hwang,Heesoo Lee,Seong Min Jeong,Myung-Hyun Lee 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.2

SiC-coated graphite was successfully fabricated at different temperatures (1300-1600 oC) through a silicon vapor depositionreaction (Si-VDR) process. Si powder was used for the Si source of the SiC coating layers. When Si powder was evaporatedat high temperature near the melting point of bulk Si, Si gases are moved and changed into Si liquid at the surface of thegraphite. The high-temperature process facilitated the formation of SiC coating layers on the graphite. The microstructural,mechanical, and thermal oxidation properties of the coated graphite were investigated.

충격관을 이용한 메탄의 연소반응 연구

류시옥,이승철,송병수,황순묵 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1

Study on the ignition of methane fuel system highly diluted with argon was carried out in the temperature range of 1515∼1905K behind a reflected shock wave to investigate the rate coefficients for the reaction CH3+O2=CH3O+O. Ignition delay times were measured by monitoring the light absorption by methyl radical at ca. 214nm and pressure profiles. Computer modeling study of methane oxidation was also performed using a GRI_MECH, version 2.11 mechanism for sensitivity analysis and calculation of ignition delay times. The correlation of τp with the maximum heat release rate (dq/dt)max in the reaction zone was also investigated.

경관 Simulation을 통한 수영강 연접지역의 건축물 고도규제 방안

윤시운,이광국,황영우 東亞大學校 建設技術硏究所 1999 硏究論文集 Vol.23 No.1

This study analyzes the future landscape assesment of Suyoung-River and adjacent areas. Computer Simulation method is used for these purposes. It is expected that the high buildings and high density in Suyoung Information Site might cover the Jang-Mountain view. Therefore this study analyzes the expectations by the experiment of the change of the heights of buildings and the view-point so that Suyoung Information Site can secure the feelings of openness and can be harmonious with natural landscape and skyline. If the high dense buildings are going to be constructed, the optimum condition of development should be between 1.5 and 2.0 of evaluation indicator. The minimum indicator 1.5 would be appropriate as the standard of regulation. The results show that the buildings along the riverside road in the west need to be regulated under the height of 30m(about 10 stories) and the buildings along the Chungryul-Street in the east under the height of 90m(about 30 stories). 하천은 산과 구릉지 등과 함께 도시의 아름다운 경관을 형성하는 중요한 경관요소이다. 도시내 하천변에 나타나는 경관문제는 대부분 대규모 건축물에 의한 경관 훼손에서 비롯된다. 부산의 대부분 하천은 시가지를 통하여 바다로 유입되고 있으나 대부분 복개되었거나 주변지역의 고층건물 입지로 인해 하천 자체가 시민에게 주는 정 (正)의 경관적 요소는 점점 감소하고 있다. 본 연구의 대상지인 수영강은 현재 시가지내를 흐르고 있어 시민에게 주요한 openspace로 기능하고 있다. 주변지역은 지금까지 수영 비행장이라는 기능으로 연해 개발이 유보되어 오다 최근 수영정보단지의 개발계획 등으로 인해 개발압력을 강하게 받고 있다. 향후개발이 진행된다면 수영강변에서 조망할 수있는 주변 자연경관과 시가지 경관은 차폐될 뿐만 아니라, 그 자체의 규모가 크고 형태도 단조로와 위압적이고 획일적인 경관이 형성되게 될 것이다. 현재에도 수영강변의 구릉지에는 아파트 가 입지하여 조망을 차폐하고 있을 뿐 아니라 녹지를 잠식하고 있다. 이러한 현상은 향후 개발압력에 빌려 수영강변의 어느 지역 에서나 발생하는 공통적인 현상이 될 것이다. 이러한 조망차폐, 획일성, 위압감의 조성, 지형의 훼손 및 잠식 등으로 대표되는 수영강의 경관문제는 현행법상 건축심의 시 받는 경관심의로 해결하기에는 한계가 있다. 따라서 본 연구는 수영강과 연접지역, 그리고 배경녹지축인 주변산을 공간적 범위로 하여 첫째, 수영강 연접지역의 범위를 설정하고 연접지역을 몇 개의 경관구역으로 나누어 각 경관구역별 경관의 문제점과 특성을 살펴본다. 둘째, 경관분석을 위하여 Computer를 이용한 수영강변 주요 조망점 에서 사람의 눈에 보이는 대로 주변 경관을 연출해 낼 수 있는 가상의 경관 Simulation을 실시한다. 셋째,이를 바탕으로 수영강 연접지역의 건축물 고도규제 를 위한 기준설정과 고도규제 방안을 제안하는데 목적이 있다.

虹彩 體質 分析에서 心腎結合組織의 虛弱 體質과 高血壓 家族歷과 관련성 硏究

金鐘牛,黃祐準,琴坰樹,李始炯,李宗淳,都金錄,趙在運,趙州掌,金鐘煜 한국전통의학연구소 2002 한국전통의학지 Vol.12 No.1

Iridology, developed more than 100 years ago, is the diagnosis of medical conditions through noting irregularities of the pigmentation in the iris The purpose of this study is to compare interrelation between CVA, hypertension family history and cardio-renal connective tissue in Iris Constitution through iris constitution examination. The subjects consist of 114 patients who were examined in Iris Constitution at Chonju Oriental Medicine Hospital attached to Wonkwang Univ. from September. 1St. 2000 to August. 31th. 2002. 1. In the distribution of Iris Constitution, among of 79cases, There are neurogenic type 13cases, abdominal connective tissue weakness constitution 31 cases, cardio-renal connective tissue weakness constitution 6 cases, cholesterol 7 cases and others 22 case in control group. 2. There are familial history of CVA and hypertention 32 cases, no familial history of CVA and hypertention1 3 cases, in 35cases of experimental group. These results imply that there is meaningfulness of interrelation between cardio-renal connective tissue weakness constitution and. CVA, hypertention.

흰쥐에서의 카르복시메칠셀룰로오스나트륨과 겔란검 혼합겔의 유착방지 효과

권윤환,이시범,이정권,박용덕,박정숙,황성주 한국약제학회 2004 Journal of Pharmaceutical Investigation Vol.34 No.6

The aim of the present study was to investigate the efficacy of a mixed gel formulation composed of sodium carboxymethyl cellulose and gellan gum (Na-CMC gel) for the prevention of adhesions after laminectomv. The anti-adhesive effect of the Na-CMC gel was tested in a controlled randomized study using an animal model of lumbar laminectomv. The animals (60 female Sprague-Dawlev rats) were randomly allocated into two treatment groups to receive the Na-CMC gel on the injured area or no gel (control). The incidence of adhesions and their grade were blindly evaluated at 4. 8 and 12 weeks after surgery. The amount of scar tissue and tenacity were grossly reduced by the Na-CMC gel at postoperative 4. 8. and 12 weeks. The mean adhesion scores were 0.75. 125. and 1.38 at 4. 8. and 12 weeks in the gel-treated group. respectively. No significant inflammatory reaction was observed and the healing of wound was not affected by the Na-CMC gel. The Na-CMC gel reduced the amount of scar formation and tenacity in rat laminectomv model without affecting the healing of operation wound and other complications. Therefore. the Na-CMC gel may be the potential to prevent postsurgical adhesions in clinical state.

방전관용 전극개발 및 특성에 관한 연구

안성환,황동원,최준영,송시준,전용우,박원주,이광식 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1

This paper describes the development of sputtered tungsten electrode for discharge tube by making use of Sputtering method using plasma. The Xe discharge tube was designed and fabricated by using sputtered tungsten electrode, and the ICCD(Intensified Charged Coupled Device) and monochromator were used in order to observe the discharge image distribution and to measure the signal intensity. As a result, the emission light form the electrode was spreaded almost uniformly over a wide wavelength band, and the discharge image distribution and the signal intensity show quite a uniform distribution. The emission light from the Xe discharge tube was peaked at 488[nm] and 648[nm].

백서 척수후근절로부터 슈반세포의 효과적인 체외 배양법

김성민,이종호,김남열,안강민,최원재,최시호,차미주,이주영,황순정,장정원,명훈,최진영,서병무,정필훈,김명진 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.4

Schwann cells(SCs), an important component of the peripheral nervous system, intract with nerous to mutually support growth and replication for the peripheral nerve regentation. Recently, ading SCs to the lumen of guidance channel is widely tried to improve regeneration or to make regeneration possible over otherwise irreparable gaps. however, it is not easy to isolate and multiplicate SCs as much as enough to help the axonal regeneration. For the allogeneic SCs source for tubular nerve guidance, we developed a little bit improved technique of harvesting and multiplicating SCs. by culturing dispersed dorsal root ganglia in specially designed medium with growth factors and serial processing, we repeatedlly generate relatively homogenous SC cultures. Our technique was compared with other methods of literature using immunostaining methods such as GFAP, S100, BDNF and the total SC count assessment at different time interval after primary culture.

선박용 폐 FRP 수지의 재활용 공정 개발

강세란,김영우,황덕기,김시영,이민규,주창식 한국환경과학회 2003 한국환경과학회지 Vol.12 No.6

A recycling process for the waste FRP from boats was developed. The recycling process is composed of decomposition of waste FRP with propylene glycol and synthesis of recycled unsaturated polyester resin from the decomposed liquid material. Prior to the decomposition, waste FRP was cut into 2cm × 5cm segments and mechanical impact was applied by press roller to give gaps between cumulated laminates. Propylene glycol effectively decomposed the waste FRP segments and glass fibers were easily separated from decomposed liquid material. Recycled unsaturated polyester resin could be made from the decomposed liquid material by reaction with maleic anhydride and phthalic anhydride.

응급의료센터에서 신경색의 조기진단

최경호,오동렬,이원재,박규남,박승현,황두영,김형국,정시경,김영민,김세경 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.4

To evaluate appropriate diagnostic studies for renal infartion in emergency medical center, we analysed 33 patients of renal infarction treated in this hospital for last 8 years. Eleven patients, 4 trauma associated and 7 aortic disease associated patients were excluded. They are 11 males and 11 females with a mean age of 51 years. Fourteen came to the emergency medical center and seven came to the outpatient department, in the other one patient renal infarction was developed during hospitalization with other disease. On their past history they had hypertension in 9, valvular heart disease in 5, and diabetic mellitus in 4 patients. Abdominal or flank pain was noted in 17 of 22(77%). The other symptoms were vomiting, nausea, fever and so on. On microscopic examination of initial urine in hospital, 5 patients showed more than 10 red blood cells by high power field examination. The mean lactic dehydrogenase level was 1,239 I.U/L(normal range 218-472 I.U/L), while the mean aspartate aminotransferase and mean alanine aminotransferase were 51 I.U/L(normal range 13-36 I.U/L) and 44 I.U/L(normal range 5-33 I.U/L). Abdominal ultrasonography showed positive findings in 5 of 16(31%), of which 3 were confirmed by Doppler ultrasonography. In 18, computed tomography was done and all those showed positive findings of renal infarction(100%). In conclusion, it is important that identify the elevated lactic dehdrogenase level in case of any suspicion about renal infarction and confirm by computed tomography.

레보프라이드 정 (레보설피리드 25 mg)에 대한 레보셀 정의 생물학적동등성

김민수,김정수,이시범,박정숙,황성주 충남대학교 약학대학 의약품개발연구소 2007 藥學論文集 Vol.22 No.-

The aim of the present study was to evaluate the bioequivalence of two levosulpiride tablets, Levopride (SK Pharmaceutical Co., Ltd.) and Revocel (Kwang Dong Pharmaceutical Co., Ltd.), according to the guidelines of Korea Food and Drug Administration (KFDA). Twenty four healthy male volunteers, 23.7±1.8 year in age and 66.8±7.6 kg in body weight, were divided into two groups and a randomized 2×2 cross-over study was employed. After three tablets containing 75 mg of levosulpiride were orally administered, blood was taken at predetermined time intervals and the concentrations of levosulpiride in plasma were determined using HPLC with fluorescence detector. The dissolution profiles of two levosulpiride tablets were not significantly different at all dissolution media. Pharmacokinetic parameters such as AUC_(t), C_(max) and T_(max) were calculated and ANOVA test was utilized for the statistical analysis of the parameters using logarithmically transformed AUC_(t), and C_(max). The results showed that the differences between two formulations were 2.59%, -2.04% and 8.94% for AUC_(t), C_(max) and T_(max), respectively. There were no sequence effects between two formulations in these parameters. The 90% confidence intervals using logarithmically transformed data were within the acceptance range of log0.8 to log1.25 (e.g., log0.95~log1.13 and log0.91~log1.06 for AUC_(t) and C_(max)). Thus, the criteria of the KFDA guidelines for the bioequivalence was satisfied, indicating Levopride tablet and Revocel tablet are bioequivalent.