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오광제(Kwang-Je Oh),김경호(Gyungho Khim),박천홍(Chun-Hong Park),정성종(Sung-Chong Chung) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.2
LM 볼가이드는 구름접촉을 갖는 이송시스템의 핵심요소로서 공작기계, 반도체 장비, 로봇 등 정밀기계에 널리 사용된다. 그러나 LM 볼가이드에서 발생하는 마찰력은 마찰열을 유발하여 위치 정도를 저하시키고 강성과 예압 변화를 야기한다. 이런 영향을 정확하게 분석하여 정밀 기계설계에 응용하기 위해서는 마찰력 모델의 정식화가 요구된다. 본 논문에서는 구름마찰, 점성마찰, 슬립마찰을 고려한 LM 볼가이드의 정확한 마찰력 모델을 유도한다. 그리고 다양한 조립, 부하 및 속도 조건에서 실험을 수행하여 마찰력 모델의 신뢰성을 검증하고, 마찰력 모델로부터 마찰 성분의 영향력을 분석한다. Linear motion (LM) ball guides with rolling contact are core units of feed-drive systems. They are widely applied for precision machinery such as machine tools, semiconductor fabrication machines and robots. However, the friction force induced from LM ball guides generates heat, which deteriorates positioning accuracy and incurs changes of stiffness and preload. To accurately analyze the effects and apply the results to precision machine design, mathematical modeling of the friction force is required. In this paper, accurate formulation of the friction force due to rolling, viscous, and slip frictions is conducted for LM ball guides. To verify the reliability of the developed friction model, experiments are performed under various assembly, load and velocity conditions. Effects of frictional components are analyzed through the formulated friction model.
십이지장궤양치료에 있어서 Misoprostol < Cytotec ( R ) > 의 효과
최흥재(Heung Jai Choi),박인서(In Suh Park),이상인(Sang In Lee),한광협(Kwang Hyub Han),오광제(kwang Je Oh),김동립(dong Lip Kim) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.2
N/A For the evaluation of clinical efficacy of misoprostol, a synthetic prostaglandin E1, analogue, in patients with duodenal ulcer, thirty patients with endoscopically proved active duodenal ulcer were admitted to this trial. Thirty patients were treated with misoprostol 200 ㎍ q. i. d. upto 4 week or 6 week in the patients who were not complete]y healed during 4 weeks. 1) The complete healing rate of duodenal ulcer by endoscopic examination at 4 and 6 week were 83.3% and 100% respectively. 2) Abnormal laboratory findings after treatment were not found. 3) Diarrhea was present in one patient and two patients complained of loose stool but these symptomes were mild and tolerable. In conculsion, this study demonstrates that misoprostol 200 ㎍ given q. i. d. for four or six weeks is effective, well-tolerated and safe in the treatment of duodenal ulcer.
방규태(Kyu Tae Bang),박찬근(Chan Keun Park),최낙현(Nag Hyun Choi),박봉수(Bong Soo Park),최웅승(Oung Seung Choi),변동일(Dong Il Byun),김형길(Hyung Gil Kim),정동균(Gong Gyoon Jung),오광제(Kwang Je Oh),심강섭(Kang Sup Shim) 대한내과학회 1993 대한내과학회지 Vol.45 No.5
Ulcers of the small bowel distal to the duodenum are not common, and some ulcers are unexplaned by any specific mechanism and have been termed nonspecific or idiopathic small bowel ulcer. In Korea, nonspecific ulcer of the small bowel is quite rare, comparison of the western contury. Recently we experienced a patient with nonspecific ulcer of ileum. A 50-year-old male patient was admitted to the hospital because of intestinal obstruction and perforation. By laparotomy, perforation and numerous stenosis were identified in the 55 cm from ileocecal valve, segmental resection has been done. The histologic findings identical to the peptic ulcer suggested the feature of nonspecific ulcer of small bowel. We present this case with the review of literature.
영구성 심박동 조율기(DDD) 로 치료한 과민성 경동맥동 증후군 1 예
심원흠,박승정,오광제,이동기 대한내과학회 1987 대한내과학회지 Vol.32 No.2
The major clinical manifestation of carotid sinus hypersensitivity syndrome is characterized by syncope or other manifestation of cerebral dysfunction (dizziness, lightness). Three types of carotid sinus hyper~sen- sitivity syndrome have been defined; 1) cardioinhibitory-ventricular asystole occuring for longer 3 seconds; 2) vasodepressor-a decrease in systolic arterial blood pressure of more than 50mmHg (with a less than 30% decrease in heart rate) and 3) mixed-a decrease in systolic arterial blood pressure of more than 30mmHg (with a more than 30% decrease in heart rate). In symptomatic patients with carotid sinus hypersensitivity syndrome associated with significant cardioinhibition, permernent pacemaker implantationhas played an increasingly frequent therapeutic role. In carotid sinus hypersensitivity, VVI pacing mode results in increased patients symptomes because of aggravation of the vasodepressor component, and therefore, DDD (DVI mode) is the optimal pacing mode. In this report, we present a case of carotid sinus hypersensitivity syndrome treated with DDD pacemaker.
균혈증시 쇽크의 발생빈도 및 사망률에 영향을 미치는 요인
이상용,김걸,박찬근,방규태,김형길,정동균,오광제,최조영 대한감염학회 1990 감염 Vol.22 No.4
A retospective clinical review on 130 patients with bacteremia was done in order to evaluate factors affecting the incidence of shock and mortality. The result were as follows: 1) The incidence of bacteremia was 0.3%. 2) The incidence of septic shock in bacteremia was 37.7%. 3) The mortality of the total bacteremia was 28.5%, that of bacteremia without shock was 13.6% and that of septic shock was 53.1%. 4) The incidence of septic shock appeared to be unrelated to sex, age or antecedent therapy with antibiotics. There was, however, significantly increased incidence of septic shock in more severe underlying disease, gram-negative bacteremia (esp. pseudomonas and proteus), antecedent therapy with immunosuppressive agents and hypothermia or failure to mount a febrile response greater than 38℃. 5) The mortality of bacteremia appeared to be unrelated to sex, age and etiologic agent (except, pseudomonas) of bacteremia. The mortality was associated with septic shock, more severe underlying disease, psudomonas bacteremia, antecedent therapy with antibiotics or immunosuppressive agents and hypothermia or failure to mount a febrile response greater than 38℃. 6) There were significant differences between the admission value for serum albumin, total serum proteins, total serum calcium and serum phosphate and those levels observed during septic shock. The corrected hypocalcemia occurred in 58.8% and the mortality was higher (though not attaining a statistical significance) among hypocalcemic patients compared with normocalcemic ones.