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AI 합금의 원소가 용융산화에 미치는 영향 -lll. 오원계 합금의 산화거동-
하용수,김철수,강정윤,김일수,조창현,Ha, Yong-Soo,Kim, Chul-Soo,Kang, Chung-Yun,Kim, Il-Soo,Cho, Chang-Hyun 한국재료학회 1998 한국재료학회지 Vol.8 No.8
오원계 AI-합금의 용융산화에 의한 $AI_2O_3$ 복합재료의 형성속도와 미세구조에 대하여 연구하였다. AI-1Mg-3Si-3Zn 합금과 AI-1Mg-3Si-5Zn합금에 Cu, Ni 각각을 1% 무게비로 첨가하였다. 각 오원계 합금은 1373K, 1473K에서 최대 20시간 동안 산화시켰으며, 산화속도는 무게증가 측정을 통하여 조사하였다. 산화층의거시적 형상과 미세구조를 광학현미경으로 관찰하였다. AI-1Mg-3Si-5Zn-1Cu 합금이 가장 우수한 산화거동을 보였으나, 산화층이 불균일하였다. 합금위에 $SiO_2$를 도포하였더니 산화속도가 증진되었으며, 균일하고 조직이 친밀한 산화층이 얻어졌다. The following work examines the growth rate and microstructure of the $AI_2O_3$-composite formation by melt oxdation of pentad AI-alloys. The I weight % of each metal elements Cu and Ni were added to AI-IMg-3Si-3Zn and AI-IMg- 3Si-5Zn alloys. The diffenent pentad AI-alloys were oxidized 20 hours long at 1373K and 1473K. The oxidation rates were determined by observing the weight gain. The macro- and microstructure of formed oxide layer were examined by optical microscopy. The AI-IMg-3Si-5Zn-lCu alloy revealed the best oxidation behavior, but formedoxide layer was inhomogeneous.The oxidation rate were accelerated, and the uniform growth of the oxide layer with fine microstructure were obtained by putting a thin layer of $SiO_2$ on the surface of the alloy.
河龍守 중앙대학교 기술과학연구소 1974 기술과학연구소 논문집 Vol.1 No.-
This paper deals with the general feed back system of constant-voltage devices shown in Fig.1. The design of the Constant-voltage accuracy and transient characteristics about constant-voltage devices means it for steady state performance and transient characteristics of automatic control system. Therefore, this paper is studied of the block diagram and calculation of feed back system on the following terms. (1) The source voltage being variable rapidly. (2) The institution valve being variable rapidly. (3) The lood being variable rapidly.
하용수,김진우,윤경혁,황성규,함인석,박연묵,김승래 慶北大學校 醫科大學 1987 慶北醫大誌 Vol.28 No.1
최근 3년 동안 경북대학병원에 입원된 비외상성 뇌실질내 혈종 환자 남, 녀 100명을 대상으로 하여 분석, 검토하였다. 혈종의 발생 빈도는 남자에서 다소 많았으며(1.4:1) 50∼60세 층에서 가장 높은 빈도를 나타내었다. 원인은 고혈압 및 동맥 경화로 추정된 것이 70%로써 가장 많았으며, 다음이 동·정맥 기형과 동맥류의 순이었고 원인 미상은 13%였다. 발생 부위는 피각부가 55%로써 가장 많았으며 다음이 피질하 및 시상부 순위였다. 그리고 30∼60㎖의 혈종이 38%로써 가장 많았다. 혈종의 형태는 국한된 것이 65%이었으며, 술전 신경학적 장애 정도는 G.Ⅲ 및 G.Ⅳ가 전체의 64%였다. 수술 치료후 Good 상태는 37%, poor 상태는 16%이었으며 사망율은 29%였다. 연령, 혈종의 부위 및 크기, 술전 신경학적 장애 그리고 혈종의 형태등은 치료 결과에 현저한 영향을 주는 요소 들이었다. Analyses and studies have been made on 100 male and female patients with non-traumatic spontaneous intracerebral hematoma at Kyunpook National Universiy Hospital, during the past 3 years. The sex incidence was found to be higher among males. The 50-60 age bracket was the most frequent among the patient's age groups. The predominant cause of non-traumatic intracerebral hematoma was thought to be from hypertension and arteriosclerosis, 70%, followed by arteriovenous malformation, cerebral aneurysm, and 13% of the cases accounted for undetermined causes. The most frequent location of the hematoma was putamen, 55%, and followd by subcortical, thalamus in that order. In amount of the hematoma, 30-50cc group ranked top, occupying 38% of all cases. The limited type of hematoma was 65%, which was slightly higher than that of the destructed type. The grade Ⅲ, and Ⅳ in the preoperative clinical grade took up 64% of the whole. The surgical results revealed; Good-37%, Poor-16%, and mortality rate was 29%. It was found that, the age, site of hematoma, and preoperative clinical grade strongly influence the results of the surgery.
하용수,김진우,윤경혁,황성규,함인석,박연묵,김승래 慶北大學校 醫科大學 1987 慶北醫大誌 Vol.28 No.1
최근 8년동안 경북대학병원에 입원된 뇌농양 환자 35명에 대한 농양의 원인, 형태, 부위 및 크기, 그리고 흡인 배농술에 의한 치료의 결과를 분석 검토하였다. 성별로는 남자(74%)에서 현저히 많았으며, 성별로는 10∼20세층(48.6%)에서 가장 많았다. 원인별로는 만성 중이염(48.6%)에 의한 것이 가장 많았으며 원인 미상이 17.1%였다. 농양의 부위는 대부분이 천막상부(88.6%)에서 발생되었으며, 측두엽(42.9%)에서의 발생이 가장 많았고 다음이 전두엽 및 두정엽의 순위였다. 그리고 단방형의 농양은 82.9%였으며 다발성 농양은 5.7%였다. 농양의 크기는 최장경이 3㎝∼5㎝가 65.7%로써 가장 많았으며, 주위 부종의 심도는 Grade Ⅱ(54.3%)가 가장 많았다. 술전 신경학적 장애는 심도가 45.7%, 중등도가 34.3% 그리고 경도가 20%였다. 흡인 배농술에 의한 치료결과는 Good이 65.7%, Poor가 14.3%였으며 사망율은 8.6%였다. 생존자중 신경학적 장애소견이 없이 퇴원한 것은 모두 50%였다. Studies through the analyses were made on brain abscesses of 35 male and female patients admitted at Kyungpook NAtional University Hospita, for the past 8 years. The sex incidence was considerably high among males, 74%, and age incidence was highest between 10-20 year-old group, 48.6%. The most frequent cause was OMPC, 48.6%, and the unknown was 17.1%. The cases were exclusively located supratentorial hemisphere, with the following breakdown: temporal-42.9%, on the top, followed by frontal, parietal lobe. The unilocular abscess type occupied 82.9%, and multiple form was 5.7% of all the cases. The size of abscess was found mostly in the group of 3-6㎝ in longest diameter, 65.7%. The grade Ⅱ of the peritumoral edema was the most frequent finding on CT scanning, 54.3%. The breakdown of preoperative consciousness level was; severe-45.7%, moderate-34.3%, mild-20%. The result of the operation revealed; good-65.7%, poor-14.3%, and the mortality rate was 8.6%. 50% of all survival cases were discharged without any neurological deficit.
河龍守,尹炳道 중앙대학교 기술과학연구소 1975 기술과학연구소 논문집 Vol.2 No.-
Discharge lamps such as fluorescent lamp require sufficient iginition voltage and ballasting function to operation conditions. Recently, dischatge lamp operating circuits and control systems have been developed to satisfy these requirements in smaller size, lighter weight, and higher effeciency by means of semiconductor devices. In this paper, instead of conventional ballast, transistor circuits was applied as stabilizing circuits of fluorescent lamp. Circuit and design constants were so chosen that current stability factor have adequate value. Experimental Results had better operating condition as compared to conventional ballast systems. And these circuits demonstrated censible dimming control.