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DBD 반응기에서 플라즈마 방전형태에 따른 PFC_(s) 가스의 분해 특성
김관태,김용호,차민석,송영훈,김석준,류정인 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.5
Perfluorocompounds(PFC_(s)), such as tetrafluoromethane (CF₄) and hexafluoroethane (C₂F_(6)), have been widely used as plasma etching and chemical vapor deposition (CVD) gases for semiconductor manufacturing processes. Since these PFC_(s) are known to cause a greenhouse effect intensively, there has been a growing interest in reducing PFC_(s) emissions. Among various CF₄ decomposing techniques, a dielectric barrier discharge (DBD) is considered as one of a promising candidate because it has been successfully used for generating ozone (O₃) and decomposing nitrogen oxide (NO). Firstly, optimal concentration of oxygen for CF₄ decomposition was found to figure out how many primary and secondary reactions are associated with DBD process. Secondary, to find effective discharge method for CF₄ decomposition, a streamer and a glow mode in DBD are experimentally compared, which includes (ⅰ) coaxialcylinder DBD, (ⅱ) DBD reactor packed with glass beads. and (ⅲ) a glow mode operation with a helium gas. The test results showed that optimal concentration of oxygen was ranged 500 ppm~1% for treating 500 ppm of CF₄ and helium glow discharge was the most efficient one to decompose CF₄.
김관태 중소기업융합학회 2021 융합정보논문지 Vol.11 No.11
전자전에서 레이더 신호 해석은 수신한 레이더 신호에서 추출한 신호제원(방향, 주파수, 펄스반복주기, 펄스 폭, 스캔주기)으로 레이더 종류를 식별하는 기술이다. 그러나 신형 레이더, 위협환경이 고도화되면서 레이더 종류를 식별하는 과정에서 레이더 식별 모호성(Ambiguity)가 발생한다. 본 논문에서는 기존 방법의 문제점을 분 석하고 새로운 방법을 제안한다. 이 기술은 레이더 스캔 주기의 펄스 도착시간 차이와 스캔주기 판별 최소 수집 개수로 스캔주기 유효성을 판별한다. 실험에 의하여 입력된 신호세기의 RMS((Root Mean Square)와 무관하게 스캔 주기 결과를 도출하는 것을 입증했다. Radar signal analysis of electronic warfare is a technique for identifying a radar type by signal parameters(direction, radion frequency, pulse repetition interval, pulse width, scan period..) extracted from a received radar pulse. However as the modern radar and new threat environments is advanced, radar identification ambiguity arises in the process of identifying the types of radars. In this paper, we analyze the problems of the existing method and propose a new method. This technique determines the validity of the scan period by the difference in the arrival time of the radar pulse and the minimum number of scan period discrimination. Experiments proved that the scan cycle results are derived regardless of the RMS((Root Mean Square) of the input amplitude.
공감365 평가원 논단 - 돼지 등급제도 변화에 따른 농가의 대응방안(상)
김관태,Kim, Gwan-Tae 축산물품질평가원 2011 KAPE누리 Vol.182 No.-
소비자가 원하는 고품질의 돼지고기를 생산하는 농가의 역할이 필요할 요즘, 특히 한 미, 한 EU FTA에 의한 연간 손해액이 1조원이 넘는다는 양돈자조금 연구용역 결과와 향상되지 않는 생산성(MSY) 등 어려운 양돈환경을 어떻게 극복할 것이냐가 관건이며, 그 방법은 다양할 것이다. 우선 생산성을 높이고 차후에 품질을 고급화하는 것도 방법일 것이고, 단기간에 생산성을 높이기 어려우면 살아남은 돼지만이라도 품질을 향상시켜 시장에 출하한다면 소비자의 관심도 높아지고 또한 소비도 안정적으로 이어질 것이다. 이에 10 11월호에 걸쳐 농가의 대응방안을 논하고자 한다.
김관태,김윤 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.2
This study examined the effects of naloxone and methyiprednisolone on neurological function, infarct size, and brain edema in thirty-two cats with acute focal cerebral ischemia induced by transorbital middle cerebral artery(MCA) clipping. Thirty-two cats were divided into three groups : a control group of twenty-two animals, a naloxone-treated group of five animals, and a methylprednisolone-treated group of five animals. All cats were anesthetized with ketamine and pentobarbital. After the removal of the orbital contents, the left MCA trunk was exposed and then. clipped with the aid of an operation microscope or loupe. Thirty minutes after clipping, five cats received naloxone(lOmg/kg bolus) and five other cats were given metbylprednisolone(15mg/kg bolus). Two hours after occlusion, all cats were killed by the intravenous injection of 2M KCl 10m1 and 25m1 of 2%TTC solution was infused into each common carotid artery. Brains were fixed and examined histologically. The results were as follows: 1) The neurologic outcome was better in naloxone-and methyiprednisolone-treated groups than in the control group. 2) Percent hemispheric volume infarction(% HVI) was higher in the control group(mean HVI=50) than in the naloxone-treated group(mean % HVI=39) and in the methylprednisolonetreated group(mean %o HVI=35). 3) The incidence of cerebral edema was significantly lower in the naloxone-treated group(40%) and methylprednisolone-treated group(40%) than in the control group(lOO%). In conclusion, treatment with naloxone or methylprednisolone improved neurologic outcome, infarct and brain edema from focal ischemic insults.
김관태 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.2
The author analysed fifty-four cases of spontaneous intracerebral hematoma(ICH) admitted to the department of neurosurgery, Chungnam National University Hospital for a period of the recent two years. The results were as follows: 1. Spontaneous ICH frequently occurred over the fifth decade, especially in the sixth decade, and in spring and autumn. 2. 85% of cases were due to primaryICH(eg. hypertension). 3. The location of hematoma was basal ganglia, subcortical region, cerebellum, intraventricular region and thalamus in order of frequency. 4. The overall mortality rate was 41%, but the mortality rate was 48% in cases of basal ganglia hematoma and 50% in cases of thalamic and subcortical hematoma. 5. The mortality didn't increase with ventricular rupture, but in cases of basal ganglia hematoma with ventricular rupture, the mortality increased. 6. The prognosis was not affected according to operation time, and the higher was the consious level on admission or the smaller was ICH, the better was the prognosis.