친환경 연료처리제를 이용한 가솔린 차량의 배기가스 저감과 연비향상에 관한 실험적 연구

유종식,김철수,김민섭 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.5

The two experiments of gasoline vehicle using eco-friendly treatment(Ecoburn) were completed. The experiments was done on traveling using the performance testing mode for chassis dynamometer and road driving test. The experiments were employed to measure exhaust emissions and fuel consumption. In this experiment, the correlation between CO₂and fuel consumption were found in gasoline vehicle. The following results are obtained by analyzing the data relativity between exhaust emissions and additives. 1) If the value of exhaust emissions such as CO, HC, NOX, CO₂were improved as gasoline mixed additives at th ratio of 300:1. The value of fuel consumption were worse compare to those of exhaust emission. The improvement of resulting data value was best CO, HC, NOX and fuel consumption in the order named. 2) The value of CO₂ were to be nearly proportional to the fuel consumption value.

CRDI 디젤엔진의 피에조 인젝터 불량에 따른 파형 분석에 관한 실험적 연구

유종식,김철수 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.6

This paper investigates the relationship of voltage and current waveform between normal piezo injector and deterioration abnormal piezo injector. The experimental methods using Pico oscilloscope and GDS scan tool are employed to measure current and voltage waveform and fuel pressure of piezo injector. The experiment is carried out during no-load condition. A summary of the important results are as follows. 1) In case of normal injector, the fluctuation of duration time of piezo injector was linearly and regularly decreased with increasing engine speed, but the that of deterioration piezo injector was irregularly decreased with increasing engine speed. 2) In main injection, the peak value of the current waveform of abnormal injector was larger than that of normal injector, the duration time of deteriorated abnormal injector was less than that of normal injector at 800rpm and 1500rpm, but the duration time of deteriorated abnormal injector was larger than that of normal injector at 2000rpm and 3000rpm. This irregularity appears to be caused by the deterioration of the injector.

노후 가솔린 차량의 정비 전·후의 배기가스와 연비 비교분석을 위한 실험방법에 대한 연구

유종식,김철수,정우원 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.2

노후 가솔린 자동차의 점화2차 파형, 배기가스와 연비와의 관련성 연구

유종식,김철수 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.3

The test was done on cars travelling at the speeds of 20km/h, 60km/h and 100km/h using the performance testing mode for chassis dynamometer. In this test, the secondary ignition waveform, exhaust emissions and fuel consumption were measured in case of faulty MAP sensor, faulty oxygen sensor and spark plugs. The following results from the related analysis of secondary waveform, emission and fuel consumption measurements were obtained : 1) The fuel consumption was higher in the order of oxygen sensor trouble, MAP trouble, spark plug trouble, before maintenance and after maintenance. Maximum fuel economy is 9.3km/L, the minimum fuel economy is 3.2km/L, the difference between max. and min. is 65.5%. 2) If you compare the oxygen sensor trouble with after maintenance, the CO has improved an average of 98%, fuel economy average of 60%. And the HC has improved an average of 87%, fuel economy average of 60%. The fuel consumption and exhaust gas was bad in the order of oxygen sensor trouble, MAP trouble and S/P trouble.

친환경 연료처리제를 이용한 디젤 차량의 배기가스와 연료소비량 저감에 관한 실험적 연구

유종식,김민섭,김철수 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.3

The several experiments of Diesel vehicles using EFT were completed. The experiments were performed on chassis dynamometer and road driving test using test mode such as FTP-75 and LA-4. The experiments were employed to measure the effect eco-friendly EFT additives on exhaust emissions and fuel consumption efficiency. In this experiment, the following results are obtained by analyzing the data relativity between exhaust emissions and EFT additives. The value of exhaust emissions such as NOX, SOX, CO2 and PM were improved as Diesel mixed EFT additives at th ratio of 200:1. The improvement of resulting data value was best PM, NOX, SOX, CO₂and fuel consumption rate in the order named.

소아 급성 복통 환자의 관리결정

유종식,성낙진,박기흠 대한가정의학회 1998 Korean Journal of Family Medicine Vol.19 No.6

기업의 전략 자산 형성을 위한 CSR의 역할

유종식 청주대학교 경영경제연구소 2022 경상논총 Vol.14 No.2

본 연구는 기업의 사회적 책임에 관한 관심이 증가하고 있는 현시점에서 호텔 기업의 사회적 책임 활동에 대한 효과를 검증하고자 하였다. 이를 위해 기존의 선행연구에서 많이 사용되고 있는 기업의 사회적 책임에 대한 하위 요인을 확장하여 5가지의 새로운 하위 요인을 제시하였고, 기업의 사회적 책임을 통한 호텔 기업 종사원의 직무성과를 확인하였다. 설문에 참여하기를 희망하는 호텔직원을 대상으로 총 345개의 데이터를 획득하였고, 320개의 데이터를 분석에 이용하였다. 본 연구의 통계 분석은 SPSS 22와 AMOS 22를 활용하였다. 본 연구의 목적을 위해 이론적 배경을 바탕으로 제시된 총 2개의 가설을 설정하였고, 통계 분석을 바탕으로 도출된 연구결과를 제시하였다. 본 연구의 결과를 바탕으로 제시된 이론적/실무적 시사점은 결론 부분에서 세부적으로 논의하였다.

친환경 이동식 미분무 소화장비 개발

유종식,김철수,고상우,강신중 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.4

This study developed a portable extinguishing equipment that can extinguish A-class, B-class fire. This equipment is made of Water Mist Gun, controlling board, decelerator, pump, engine, and etc,. This equipment is formed mist water when pressurized water with high pressure flows through a radial shape nozzle. As a result of several efficiency tests, it is developed nozzle and equipment that are not clogged, and improved the extinguishing efficiency. This developed equipment indicated a excellent effect of initial extinguishment of fire in a vulnerable area where it is difficult to approach such as temple, and traditional market.

호텔 종사원의 소진현상이 조직몰입과 비재무적 성과에 미치는 영향에 관한 연구

유종식,김재중,이애주 한국외식산업학회 2016 한국외식산업학회지 Vol.12 No.4

This study is a research of how commitment to organization and non-financial perspective is reflected from burn-out phenomenon of hotel employees working on five-star hotels. The data was collected from five-star hotels in and around Seoul based on object of hotel employees. Originally 350 surveys were distributed and only 292 surveys were used for substantial analysis. The result of analysis is reported as following statements. First, in the group of the lesser burn-out employees; positive influence of concentration and focus in the organization was increased. Secondly, there was also increase of non-financial perspective. Lastly, as summary of above, the employees with lesser burn-out levels have concentration on organization and had higher results in non-financial perspective. The implication based on the analyzed results of research suggests that in order for the corporation to increase productivity, it is essential for them to recognize the importance of burn-out phenomenon and consider minimizing the exhausting activity causing it by introducing various resolutions.

노후 가솔린 차량의 정비 전 ․ 후의 배기가스와 연비 비교분석을 위한 실험방법에 대한 연구

유종식,김철수,정우원 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.2

The two experiments were done on stationary car at 800rpm, 1500rpm and running car on oscilloscope and chassis dynamometer at the speeds of 20km/h, 60km/h. In this experiment, the relativity between waveform, exhaust emissions and fuel consumption through two experimental methods were measured in case of cars with failures in MAP sensor, O sensor, spark plugs. The following results are obtained by analyzing the data relativity between two experimental methods, such as stationary and running tests. A simple stationary test under the maintenance of a decrepit gasoline vehicle would be realistic possibility to predict the fuel consumption and the exhaust emission comparable to results of running test with a chassis dynamometer.