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In Korea, the vehicle registration has been steadily increasing. Main reason of this considerable increase is the gravitation of population toward cities and rapid industrialization. In order to reduce air pollution caused by mobile sources under this condition, Korean government has regulated motor vehicle emission and strengthen the emission standards. Therefore vehicle manufacturers have to meet these standards and try to maintain performance of vehicles in warranty period. According to results of study, the ratio of a car that exceed appear to the LPG fueled vehicle(43%). diesel fueled vehicle(28%). gasoline fueled vehicle(24%) by emission standard test result. CO and HC appeared high emission level in a LPG car and NOx appeared diesel. Gasoline and LPG light duty vehicle in CO's average. a light duty multipurpose vehicle in PM's average exceeded to emission standard at manufactured year. CO's average of LPG vehicle approximated in standard as 99% of emission standard. All item higher emission level appeared in light motor vehicle (lower 1.000㏄) depend on gasoline fueled vehicle. especially 2500㏄ gasoline fueled vehicle was most good emission level. Need less driver's maintenance parts for improvement of this. and repairman judged that do not tempering adjustment of fuel system. After repairing vehicle show lower emission level than did not one. User consider maintenance that make good emission level.

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Abstract
1. 서론
2. 연구 내용 및 방법
3. 배출가스 시험결과
4. 결론
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UCI(KEPA) : I410-ECN-0101-2009-556-016820217