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S.I. 기관 밸브시스템에서의 이상연소에 관한 실험적 연구
박경석,한성철,장석형,손성만 경희대학교 산학협력기술연구원 2002 산학협력기술연구논문집 Vol.8 No.-
The suction pressure of an abnormal condition spark ignition engine which has non adjusting intake valves becomes reduced and residual gas increases at a greater rate than under normal combustions. This reduction in suction pressure is caused by the distribution of in equalable air in a cylinder leading to abnormal combustion. If this condition continues, the engine ceases due to an increase in engine heat loss. In this study, we conducted tests to determine the combustion characteristics of a spark ignition engine under both norman and abnormal conditions. The results of this study will establish basic data analysis for developing an automotive diagnosis system by analyzing some of the factors including pressure in the cylinder, output signal of the MAP Sensor and Exhaust gases.
Treatment Outcomes of Patients with Head and Neck Squamous Cell Carcinoma of Unknown Primary
박경석,임혜린,정세현,이동훈,임상철 전남대학교 의과학연구소 2021 전남의대학술지 Vol.57 No.1
The purpose of this study was to evaluate clinical characteristics and treatment outcome of patients with head and neck squamous cell carcinoma of unknown primary (HNSCCUP), treated according to the method of our hospital. Six patients with histopathologically and radiologically confirmed HNSCCUP January 2010-December 2016 were enrolled in this study. All patients underwent radical neck dissection involving level I-V, bilateral tonsillectomy, and diagnostic esophagoscopy and postoperative radiotherapy (RT), with or without concurrent chemotherapy. There were no major complications resulting from surgical intervention. Duration of follow-up was 56.3±20.2 months (range, 28-82 months). There was no recurrence or late detection of primary site of HNSCCUP. All patients with HNSCCUP except one were alive, at the time of the last follow-up. The other patient had no recurrence of HNSCCUP, but died of colon cancer at 58 months postoperatively. We have successfully treated patients with HNSCCUP by performing radical neck dissection, bilateral tonsillectomy, and diagnostic esophagoscopy and postoperative RT with concurrent chemotherapy, and recommend using this method as the main treatment method.
박경석 경희대학교 산학협력기술연구원 2001 산학협력기술연구논문집 Vol.7 No.-
This paper deals with the theoritical analysis on the heat stress and deformation of dual exhaust manifold. In this study the performance of dual pipe exhaust system have been carried out through different gas temperature, the following conclusions were derived. 1) Judge from the whole heat distribution, the inner side temperature has a higher degree than the outsider in a part that has a dual pipe. 2) The heat stress of manifold takes high value inner side of the intense curve. 3) The heat deformation takes the highest value in the begining of the first port, second port and third port.
장석형,홍익표,박경석 경희대학교 산학협력기술연구원 1995 산학협력기술연구논문집 Vol.1 No.-
It is widely recognized that exhaust emissions,fuel economy and engine torque are affected by the coolant temperature of the engine, and logic would suggest that a cooling system offering a better compromise of coolant temperature of the engine would improve both overall engine power and economy. Coolant temperature and intake air temperature near cooling parts is measured CAMS(Computer Aided Measuring System) with K-type thermocouple and A/D converter.
朴璟碩,李相植 동국대학교 농림과학연구소 1989 農林科學 論文集 Vol.13 No.-
This study was carried out to verify the Nature and Role on the Forest Association in Korea through Historical fact, Theoretical background, and Analysis of the Association's business. the results were summarized as follows : 1. The Forest Association have both the Nature of agency group for National forest resource policies and of Cooperative Association for profit of the union's member. 2. The Forest Association have to be emphasized on the Nature of the local union over the Nature of the functional union. 3. The Forest Association have to be forstered from a point of view Local Forestry Capital. 4. The Forest Association have to be become independent through the variety of economic business. And it's independence have to be supported with the systematical and legal security. 5. In order to accomplish these roles would be taken a decisive support from the Government and carried out it's effort of the Forest Association.