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볼 베어링의 결함검출을 위한 Adaptive Line Enhancer의 적용
김영태,최만용,김기복,박해원,박정학,김종억,류준 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.2
The early detection of the bearing defects in rotating machinery is very important since the critical failure of bearing causes a machinery shutdown. However it is not easy to detect the vibration signal caused by the initial defects of bearing because of the high level of random noise. A signal processing technique, called the adaptive line enhancer(ALE) as one of adaptive filter, is used in this study. This technique is to eliminate random noise with little a prior knowledge of the noise and signal characteristics. Also we propose the optimal methods for selecting the three main ALE parameters such as correlation length, filter order and adaptation constant. Vibration signals for three abnormal bearings, including inner and outer raceways and ball defects, were acquired by Anderon(angular derivative of radius on) meter. The experimental results showed that ALE is very useful for detecting the bearing defective signals masked by random noise.
잡음환경에서 구름 볼 베이링의 결함검출을 위한 ALE의 적용
김영태,최만용,김기복,박해원,박정학,김종억,류준 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
It is very important to detect the bearing defects in rotating machinery since the critical failure of bearing cause a machinery shutdown. However it is difficult to detect the vibration signal resulting from the initial defects of bearing because of the high level of broadband noise. A signal processing technique, called the adaptive line enhancer(ALE) as one of adaptive filter, is studied in this work. This technique is to eliminate broadband noise without a prior knowledge of the noise and signal characteristics. Also we propose the optimal methods for selecting the three main ALE parameters such as correlation length, filter order and adaptation constant used in the adaptative process. Vibration signals for three abnormal bearings, including inner and outer raceways and ball defects, were acquired from Anderon(angular derivative of radius on)meter. The experimental results showed that the proposed technique can reliably detect the bearing defective signals masked by broadband noise.
윤규택,이동주,최만용,박해원,박정학 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
An automobile hub is composed of a hollow cylindrical part with inner and outer diameters. These hub diameters must be precise, as any irregularities in them (diameters) can influence/degrade the motion of an automobile with this problem. Highly accurate and reliable hub inner and outer diameters measurement systems are therefore required for inspection of the diameters. In this research, an automobile hub inner and outer diameters measurement system has been developed and tested. The system consists of measuring heads with LVDT sensors, and associated software for automatic measurement and calibration of the diameters and the sensors respectively. The system has been evaluated in comparison with an existing measurement system, and the following outcomes have been achieved; ·Improved and guaranteed quality and reliability ·Increased productivity and cost reduction These results prove the system developed in this research to be suitable for automobile hub inspection.
Urapidil, Labetalol의 투여가 기관내 삽관시 심혈관계에 미치는 영향
신용섭,윤석화,손수창,이원형,이정은,황원재,김만수,김영주,김혜자,최세진 충남대학교 의과대학 지역사회의학연구소 1994 충남의대잡지 Vol.21 No.2
We have examined the comparative efficacy of small doses of intravenous urapidil and labetalol in blunting hemodynamic response to endotracheal intubation and surgical incision in 30 patients without cardiovascular diseases. After intravenous urapidil 0.2 mg/kg or labetalol 0.2 mg/kg anesthesia was induced with thiopental 5mg/kg. Endotracheal intubation was facilitated by vecuronium 0.15 mg/kg with priming principle and anesthesia was maintained with enflurane and nitrous oxide in oxygen. Systolic, diastolic and mean arterial pressure and heart rate were measured before administration of the drugs, 5 minute after administration, just prior to endotracheal intubation and 1, 3, 5, 10 minute after intubatin. Also the peak blood pressures and heart rate within 10 minutes after surgical incision were measured. Endotracheal intubation and surgical stimulation were associated with significant increases in blood pressures and heart rate in both urapidil and labetalol group. Comparison of the changes in systolic, diastolic, and mean artrial pressures and heart rate between urapidil and labetalol group showed no significant difference except peak systolic pressure after surgical incision. It is concluded that the pressor response to endotracheal intubation and surgical stimulation are not influenced significantly by urapidil 0.2 mg/kg or labetalol 0.2 mg/kg. However, urapidil and labetalol preloading may be similarly effective in the blunting of the increases in blood pressures with larger doses of the durgs during anesthetic induction.
A New Bacterial Blight Resistant, High-Quality Cultivar, "Seogjeongbyeo" Adaptable to Reclaimed Area
Hae Chune Choi,Hung Goo Hwang,Ha Cheol Hong,Yeon Gyu Kim,Hong Yeol Kim,Moon Tae Song,Yong Hwan Choi,Chang In Yang,Jong Doo Yea,Young Chan Cho,Man Kee Baek,Eung Gi Jeong,O Young Jeon 한국육종학회 2005 한국육종학회지 Vol.37 No.3
방화화재에 대비한 고시원의 화재안전성 개선에 관한 연구
김해만(Hae Man Kim)(金海萬),최민기(Min Ki Choi)(崔珉暣,),최돈묵(Don Mook Choi)(崔敦黙,) 위기관리 이론과 실천 2013 Crisisonomy Vol.9 No.7
최근 급속도로 성장하고 있는 산업화로 인해 건축물이 대규모화, 초고층화, 복합화 됨에 따라 많은 변화가 발생하였다. 그 중에서도 실질적으로 주거용도로 사용하면서 수험생뿐만 아니라 젊은 독신 직장인, 외국인 근로자, 도시빈곤층 등 다양한 계층이 이용하고 그 구조가 벌집 형태의 작은 쪽방 구조로 되어 있는 고시원이 증가하고 있는 추세이다. 산업화로 인한 빈부격차, 노사문제, 실업률의 증가 등 많은 사회적 갈등의 심화로 강력 범죄가 증가하고 있는데 특히 불특정 다수인을 상대로 행해지는 범죄인 방화가 증가하면서 많은 인명피해가 발생하고 있다. 본 연구는 고시원의 방화화재 사례 분석과 감식실무를 통해 화재안전성 개선 방안을 제시하고자 연구 되었으며 이러한 연구의 목적을 달성하기 위해 방화화재 사례 분석과 방화원인 감식기법을 조사하였다. 이러한 조사 결과를 토대로 고시원의 방화화재 위험성을 살펴보는 동시에 제도, 법규, 건축, 안전시설 차원의 화재안전성 개선방안을 고찰 하였다. Recently, buildings became larger, higher and more complex. There were many changes by rapidly growing industrialization. Gosiwons with an interior structure of small room of hive form used by many classes are growing. They are used as dwelling purpose substantially. They are used by not only examinees but also young single workers, foreign workers and poor classes in a city. Strong crime is also increasing by deepening of many social conflict. Especially, many life damages are happening as a don't ask crime, and arson. It is increasing and intended for unspecified individuals. Therefore, this thesis is formed to present the improvement method of all stability through example analysis about prevention of fire in Gosiwons and exaltation of practical discernment ability. I investigated the example analysis about arson and discernment skill of the cause of arson. On the basis of this investigation result, I also investigated the danger of arson fire and surveyed about the improvement method like system, law, architecture and safety facility.