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논문 : 기계적 성질 ; 고응력 스프링강의 열처리 변화에 따른 저주기 피로특성
김광원 ( Kwang Won Kim ),유선준 ( Sun Jun Yoo ),남원종 ( Won Jong Nam ),이종수 ( Chong Soo Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
In the present investigation, the low cycle fatigue(LCF) behavior of a high-strength steel heat-treated to different strength levels has been studied using the cylindrical smooth specimens under strain-controlled fully reversed pull-push condition: During the strain-controlled cycling the steel exhibits continuous softening behavior independent of the applied strain levels and heat-treatment. It has been found that the saturation of the plastic energy density per cycle(△W) proves to be a valid criterion to determine the stable hysteresis loops for establishing the cyclic stress strain(CSS) curve. The strain-life curve calculated on the basis of the CSS relationship is in good agreement with the experimental result, indicating a fine consistency between data from the CSS approach and from the strain-life approach. Then, the LCF properties are discussed with regard to their dependence on the heat treatments or strength levels of the steel investigated. Finally, the low-energy dislocation substructures during LCF have been identified using transmission electron microscopy.
김광원(Kwang Won Kim),최영길(Young Kil Choi),고은미(Eun Mi Koh),김덕윤(Deog Yoon Kim),김병호(Byung Ho Kim),장영운(Young Woon Chang),장린(Rin Chang),김용봉(Yong Bong Kim) 대한핵의학회 1990 핵의학 분자영상 Vol.24 No.2
N/A Scintigraphic measurement of gastric emptying time has been reported to be influenced by the variation in depth of radionuclide within the stomach. In order to determine the effect of tissue attenuation in the measurement of gastric emptying time, 15 gastric emptying studies were performed with Tc-99m labeled egg sandwiches. Single anterior detector method overestimated the T1/2 by an average of 13% than geometric mean method and the range of overestimation was wide (from -13% to +32%). Therefore, to evaluate the gastric empthying time accurately, methods of attenuation correction are needed.
김광원(Kwang Won Kim),최인선(In Seon S . Choi),박석채(Seog Chea Park),장안수(Ahn Soo Jang),임호(Ho Lim) 대한내과학회 1999 대한내과학회지 Vol.57 No.1
Researches on the characteristics of fatality-prone asthmatics have been performed in western countries, but there are few reports in this field in Korea. The purposes of this study were to clarify the magnitude of the problem and to identify the risk factors of near-fatal asthma(NFA). Methods : The records of patients admitted due to asthma attack were analyzed retrospectively. Results :1) The subjects had NFA in 50.6% and PaCO2 > 45mmHg in 22.9%. Five(11.1%) among NFA patients and 3 out of 19(15.8%) subjects with PaCO2 > 45mmHg required mechanical ventilation. 2) There were no significant differences between NFA and non-NFA in age, sex, resident place, academic career, familial and personal history of atopic diseases, serum total IgE level, positive skin prick test to house dust mites, accompanying allergic rhinitis and aspirin intolerance, emphysema on chest high resolution computerized tomogram, dyspnea perception, previous asthma education, regular OPD follow-up, and use of antiinflammatory drugs. 3) However, cigarette smoking(62.2% vs 38.6%), accompanying paranasal sinusitis(66.7% vs 45.3%), chronic asthma severity(severe persistent: 55.5% vs 29.5%), hospitalization frequency(2.93 vs 1.58), and duration of recent asthma exacerbation(6.6 vs 18.8 days) in NFA were significantly different from those in non-NFA.4) The relative risk for NFA was high in patients with history of hospitalization > 3, severe persistent asthma, exacerbation period < 3 days, smoking, or sinusitis in the order of frequency. Conclusion : Near-fatal asthma is a prevalent problem in clinical practice and asthma admission history, severe persistent asthma, short exacerbation period < 3 days, smoking, and paranasal sinusitis are the risk factors warning near-fatal asthma attack in advance.