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선형 회귀 분석과 회색 관계 분석을 이용한 디젤엔진의 다단연료분사 제어전략 최적화 연구
김수겸 ( Soo Kyum Kim ),우승철 ( Seung Chul Woo ),김웅일 ( Woong Il Kim ),박상기 ( Sang Ki Park ),이기형 ( Ki Hyung Lee ) 한국분무공학회 2015 한국액체미립화학회지 Vol.20 No.4
Recently, the engine calibration technique has been much more complicated than that of the past engine case in order to satisfy the strict emission regulations. The current calibration method for the diesel engine which has an increasing market is both costly and time-consuming. New engine calibration method is required to develop for high-quality diesel engines with low cost and release it at the appropriate time. This study provides the optimal calibrating technique for complex engine systems using statistical modeling and numerical optimization. Firstly, it design a test plan based on Design of Experiments, a V-optimality methodology which is suitable looking for set-points, and determine the shape of test engine response. Secondly, it uses functions to make linear regression model for data analysis and optimization to fit the models of engines behavior. Finally, it generates the optimal calibrations obtained directly from empirical engine models using Grey Relational Analysis and compares the calibrations with data. This method can develop a process for systematically identifying the optimal balance of engine emissions.
커먼 시스템에서 DME-LPG 혼합연료의 거시적 및 미시적 분무특성에 관한 연구
김웅일 ( Woong Il Kim ),김형익 ( Hyung Ik Kim ),우승철 ( Seung Chul Woo ),이창식 ( Chang Sik Lee ),이기형 ( Ki Hyung Lee ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
This study is to investigate the Macroscopic and Microscopic spray characteristics of DME-LPG blended fuels in common-rail system. The visualization experiment was performed to analyze the macroscopic spray characteristics of test fuels. In addition, In order to compare liquid phase and gas phase, the experiment using BOS method is performed. Spray tip penetration, spray cone angle and spray area were measured. SMD and spray particle velocity were measured using the PDPA system to analyze the microscopic properties of test fuels. The results of this experiment showed that spray tip penetration, spray cone angle and spray area of DMELPG fuels are similar to those of DME fuel. When compared to results of experiment using BOS, significant differences of spray tip penetrations, spray cone angle and spray area are showed because of gas phase. SMD of DME-LPG blended fuels is smaller than that of DME fuel. Velocity of DME-LPG blended fuels is faster than that of DME fuel.
가토 대퇴골골에 중첩이식된 단순냉동 및 냉동 건조 동종골의 치유과정에 관한 실험적 연구
정호용(Ho Yong Chung),이동근(Dong Keun Lee),엄인웅(In Woong Um),신기영(Ki Young Shin),우승철(Seung Chul Woo) 대한구강악안면외과학회 1994 대한구강악안면외과학회지 Vol.20 No.2
The use of autologous bone grafts for ridge augmentation is widely accepted. However, the development of other bone graft substitutes reduced the importance of the site from which grafting material is taken. Allogeneic bone grafts are a potential alternative. The variables that may influence the results of allogeneic bone grafts, are whether the grafts are cortical or cancellous, chips or blocks, undecalcified or fully decalcified, deep freeting or freeze-dried, etc.. In an experimental study of the femurs of rabbits on which the onlay undecalcified cortical bone grafts were performed, we observed the histologic differences between deep forzen and freeze-dried cortical allogeneic bone grafts on the healing and repair processes. These results can be compared to those from autologous bone grafts. The from autologous bone were: 1. The inflammatory reaction with macrophages and lymphocytes were observed in the first week, but disappeared before 4 weeks. The inflammatory reaction was more severe in the deep frozen group. 2. In the freeze-dried group, the bony union was earlier than the deep frozen group. 3. The osteoblastic activity of grafts increased for the first 6 weeks then decreased slightly by 8 weeks. Osteoblasts were more active in the autologous and freeze-dried groups. 4. New bone formation was slower in the deep frozen group in the first two weeks, but after two weeks there were no distinguishable differences between the groups. 5. The bone resorptions around the grafts continued far 6 weeks after the operation. The bone resorptions were greater in the deep frozen group. 6. More capillary proliferations in the intersurfaces and grafts were observed in the autologous and freeze-dried group. In the results as written above, the freeze-dried group was superior to deep frozen group in the healing process, but in fact, there were considered that the undecalcified, freeze-dried or deep frozen allogeneic bones could be used in the onlay graft for augmentation of jaws.
안면신경 마비 환자에 있어서의 측두근 및 근막피판을 이용한 안면근 기능 회복 증례보고
정창주,권혁도,엄인웅,우승철,민승기,정호용 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.1
Generally, the totally paralyzed face can never be made normal by any of the current methods of reconstruction. Careful selection of patients based on sound judgment of what can and cannot be achieved by the proposed surgical technique is paramount to a successful operation and a satisfied patient. The results are related to time of delayed between injury and repair : the shorter the delay the better are the results. The objectives in correcting facial paralysis are to achieve normal appearance at rest ; symmetry with voluntary motion ; control of the ocular, oral, and nasal sphincter; symmetry with involuntary emotion and controlled balance when expressing when expressing emotion ; and no significant functional deficit secondary to the reconstructive surgery. It must be employed a number of concepts, for treatment of the paralyzed face by surgeon, depending on the cause, time interval, and wound characteristics, as well as the availability of and necessity for neuromuscular substitution. Nerve grafts, crossovers, muscle transfers, free muscle and nerve-muscle grafts, micronuerovascular muscle transfers, and regional muscle transpostion are the principal methods being developed. We applied the tmporal musle transposition for reanimation of unilatrally paralyzed faces for long times on two patients. The results of muscle transposition can be enhanced by the patient's learning to activate the transposed muscle by voluntary effort, and are best in patients who are motivated to learn the necessary motor-sensory coordination techniques.