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민경원,김진구,김성춘,정란,Min, Kyung-Won,Kim, Jin-Koo,Kim, Sung-Choon,Chung, Lan 한국전산구조공학회 2001 한국전산구조공학회논문집 Vol.14 No.2
성능지수는 제어 대상이 되는 구조물의 응답과 제어기의 성능에 관한 가중함수로 구성되어 있다. 따라서 가중함수의 설계에 따라 성능지수가 변화되며 제어 효율이 달라진다. 본 논문에서는 최적 능동제어 알고리듬의 일종인 시간 영역에서의 성능지수를 고려한 LQR기법과 LQG기법 및 주파수 영역에서의 성능지수를 고려한 H₂기법에 대하여 동일한 가중함수를 적용하여 제어 성능인 제어율과 제어력을 비교하는데 목적을 두고 있다. 그러나, LQG기법은 모든 상태 변수를 알아야 하는 LQR기법의 한계를 극복할 수 있으며 LQR기법과 동일 수준의 제어율과 제어력을 보이고 있고 출력 제어라는 장점을 고려하면 현실적인 기법이라고 말할 수 있다. 마지막으로 구조물 응답과 제어기의 주파수 특성을 고려하여 주파수 필터의 가중함수를 설계하는 H₂기법을 분석하였다. H₂기법은 제어력을 저주파수 영역에 집중시킬 수 있기 때문에 구조물 응답을 효과적으로 제어할 수 있는 방법으로 분석되었다.
횡문근 융해증이 발생한 농약중독 환자에서 급성 신부전 발생의 연관요인
강창우,이경우,정진희,강태신,김동훈,김성춘,박인성,Kang, Chang-Woo,Lee, Kyung-Woo,Jung, Jin-Hee,Kang, Tae-Shin,Kim, Dong-Hoon,Kim, Sung-Choon,Park, In-Sung 대한임상독성학회 2009 대한임상독성학회지 Vol.7 No.2
Purpose: Rhabdomyolysis is one of the most important complications of pesticide intoxication. It affects a patient's clinical prognosis and can cause acute renal failure. It is important that patients diagnosed with pesticide intoxication receive an accurate initial diagnosis and proper treatment to prevent significant complications. This study's objective was to investigate and confirm related factors causing acute renal failure by verifying clinical observations and laboratory findings collected following pesticide intoxication. Methods: A retrospective analysis was made of 734 patients who presenting to our emergency medical center after ingesting pesticides between January 2006 and December 2008, Of these, 513 patients were selected for the study. Two hundred and twenty-one patients were excluded because of paraquat intoxication, age (if under 18), or chronic renal failure. Seventy-four patients were diagnosed with rhabdomyolysis, based on serum creatinine phosphokinase levels were > 1,000U/L. Acute renal failure was diagnosed when creatinine levels were > 2.0 mg/dL. Results: Among the 74 patients diagnosed with rhabdomyolysis, 26 (35.1%) experienced acute renal failure. The most meaningful related factor in the prediction of acute renal failure was initial arterial pH and creatinine level. Conclusion: Initial arterial pH and creatinine level are predictors of complications such as acute renal failure in patients with rhabdomyolysis.
구조물의 진동감소를 위한 축소적충고무베어링의 진동 특성 연구
민경원 ( Min Kyung-won ),호경찬 ( Ho Kyoung-chan ),황성호 ( Hwang Sung-ho ),김성춘 ( Kim Sung-choon ),정진욱 ( Joung Jin-wook ),이강민 ( Lee Kang-min ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
The objective or this study is to obtain the fundamental data or layered rubber bearings to prevent the excessive vibration due to the operation of large industrial facilities or transportations. Therefore, the characteristics of the layered rubber bearings are different from those of the layered rubber bearings which are developed mainly for the seismic reduction of structures. Five kinds of the layered rubber bearings are manufactured with different thickness of rubbers and number of plates. The buckling resistance loads are found experimentally for each set of the layered rubber bearings and the relationships between restoring forces and displacements are obtained. All these findings will be employed to design and manufacture the layered rubber bearings which are used for the vibration reduction of structures.