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정근화(Keun-Hwa Jung),안광운(Kwang-Woon Ahn),이승배(Seungbae Lee),김진화(Jin-Hwa Kim),강신형(Shin-Hyoung Kang) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
The cavitation causes suction performance and efficiency of the high-speed pump to be reduced significantly. To diminish these effects, the inducer has been used Most of the inducer is designed at a maximum efficiency point of the pump, therefore suction performance drop due to effects of flow separation and inlet inverse flow is often observed at off-design point. The objective of this study is to find out the cavitation modes at various conditions by applying event detection technique and to design an inducer reducing cavitation. The pressure fluctuations at each cavitating condition were measured at inducer inlet and outlet locations using pressure transducers, which were located 90 degrees apart from each other to identify the cavitation modes. The time-frequency characteristics were analyzed by using Choi-williams distribution. In the second part of this paper, the inducer design method which uses nominal performance characteristic and onset condition of cavitation is introduced and applied to real situation.
원심 전향익 송풍기 제품규격 KS B 6326의 개정 해설
이승배,김회룡,김광용,정근화,Lee, Seungbae,Kim, H.-R,Kim, Kwang-Yong,Jung, Keun-Hwa 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.1
The revision is proposed for forward curved bladed fans in order to make the KS B 6326 established in 1987 in agreements with newly revised KS standards. This proposal includes modification of Aplication range, numbering system, classification based on performance, and allowing dimensions for specified sizes.
중등도 이상의 위험 수술을 받은 환자에서 수술 전후 항혈전제 약물 사용 평가
이현아,조윤희,조윤숙,한현주,이주연,정근화,이상건,Lee, Hyeon-Ah,Jo, Yun Hee,Cho, Yoonsook,Hahn, Hyeon Joo,Lee, Ju-Yeun,Jung, Keun-Hwa,Lee, Sang Kun 한국임상약학회 2017 한국임상약학회지 Vol.27 No.1
Objective: The perioperative management of antithrombotic therapy is often challenging and it requires a fine balance between the risk of hemorrhage and thrombosis. We aimed to evaluate the antithrombotic management for moderate to high risk patients in real world setting. Methods: Among the patients who were consulted to the neurologist for the evaluation of perioperative risk from 2010 to 2012, patients undergoing moderate to high risk surgery and taking antithrombotics within 30 days were identified. We analyzed the timing of discontinuation and reinitiation of antithrombotic drugs before or after surgery as well as the status of bridging therapy. In addition, the conformity with the guideline suggested by American College of Chest Physicians was assessed. The rate of thromboembolic event and major hemorrhage were also investigated. Results: A total of 329 patients were included. The concordance rate of warfarin stop and restart time with guideline was 23.4% and 10.3%, respectively. Continuing aspirin in patients undergoing coronary artery bypass surgery or non-cardiac surgery in patients with high risk for cardiovascular events were 59.2% and 2.6%, respectively. Bridging therapy was adopted in 92.9% and 81.2% in patients who had received anticoagulant before surgery and who were at high and low risk thromboembolism, respectively. In entire cohorts, 30-day incidence of major bleeding and thromboembolic event were 31.9% and 3.0%. Co-morbid renal disease were shown as independent predictor for major bleeding (adjusted OR 2.65. 95% CI 1.33-5.28). Conclusion: The concordance rate with guideline regarding perioperative antithrombotic use was low and bridging therapy was prevalent in patients undergoing moderate to high risk surgery.
이승배(Seungbae Lee),김회룡(H.-R. Kim),김광용(Kwang-Yong Kim),정근화(Keun-Hwa Jung) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
The revision was proposed for forward curved bladed fans in order to make the KS B 6326 established in 1987 in agreements with newly revised KS standards. This proposal includes modification of Application range, numbering system, classification based on performance, and allowing dimensions for specified sizes.