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유성연,이제묘,박준택,류윤수,김중곤,Yoo Seong-Yeon,Lee Je-Myo,Park Jun-Tack,Ryoo Yoon-Soo,Kim Jung-Gon 한국공기청정협회 2005 空氣淸淨技術 Vol.18 No.1
Construction work is an art of making something out of nothing. To run the construction project smoothly, budget, organization and engineering should be balanced. Standardization and simplification of construction bill are needed in order to maximize the
지명석(Myoung-Seok Jie),유성연(Seong-Yeon Yoo),박준택(Jun-Tack Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
New concept spark plug was developed to study its influence on the combustion characteristics of SI engine. It has pre-ignition chamber in the lower end of spark plug and flame hole. Fresh mixture gas can be got in pre-ignition chamber of spark plug without any fuel supply system. This spark plug was tested to a commercial engine. Fuel consumption rate, emission gas and MBT timing were measured in the engine dynamometer varying the flame hole number, hole position, hole size of the pre-ignition chamber of the spark plug. New concept spark plug induces fast burn in combustion than comparing with the conventional spark plug. MBT timing was retarded about 3~5˚ crank angle. The flame hole number, hole direction and volume of pre-ignition chamber were found to influence emission gases.