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교통사고통합지수를 이용한 차년도 지방자치단체 교통한전수준 추정에 관한 연구
임철웅 ( Cheoul Woong Rim ),조정권 ( Jeong Kwon Cho ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 No.4
Traffic Accident Merging Index (TAMI) is developed for TMACS (Traffic Safety Information Management Complex System), TAMI is calculated by combining ``Seventy Index and Frequency``, This paper suggest the accurate TAMI prediction model by time series forecasting. Preventing the traffic accident by accurately predicting it in advance can greatly improve road traffic safety. Searches the model which minimizes the error of 230 local self-governing groups, TAMI of 2007-2009 years data predicts TAMI of 2010. And TAMI of 2010 compares an actual index and a prediction index. And the error is minimized the constant where selects. Exponential Smoothing model was selected. And smoothing constant was decided with 0.59. TAMI Forecasting model provides traffic next year safety information of the local government.
임철웅 ( Cheoul Woong Rim ),조정권 ( Jeong Kwon Cho ),김수열 ( Su Yeol Kim ),김주영 ( Ju Young Kim ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.3
Traffic Accident Merging Index (TAMI) is developed for TMACS (Traffic Safety Information Management Complex System). TAMI is calculated by combining ``Severity Index`` and ``Frequency``. The existing indexes are Traffic deaths per 100,000 population, Traffic deaths per 100,000 inhabitants/per billion veh-km, etc. However, there is no consistency in using them among local governments, so it can create confusion. Moreover, the index level is too complicated to understand. Therefore, this study suggests new traffic safety index, TAMI. It will work to improve the weaknesses and present accurate status of traffic safety in local governments
바이오원유-에탄올/파일럿 디젤유 이종연료 혼소를 통한 디젤엔진의 연소 및 배출가스 특성에 관한 연구
김민재(Min-Jae Kim),이석환(Seok-Hwan Lee),조정권(Jeong-Kwon Cho),윤준규(Jun-Kyu Yoon),임종한(Jong-Han Lim) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.5
최근 화석연료의 고갈, 지구온난화 그리고 환경오염이 세계적인 공공의 문제로 대두됨으로써 신재생에너지에 관한 연구들이 많이 진행되고 있다. 이러한 신재생에너지들 중 바이오연료는 다루기 쉬울 뿐만 아니라, 낮은 가격과 풍부한 자원성이 미래에 화석연료를 대체할 수 있는 잠재성을 가지고 있다. 바이오연료 중 본 연구에서 사용한 급속 열분해유는 폐목재나 억새, 갈대와 같은 비식용작물에서부터 추출되었고, 이는 무한한 자원성 때문에 디젤엔진에서 디젤유를 대체할 신재생에너지로 주목받고 있다. 하지만 열분해유는 낮은 세탄가, 높은 점도, 높은 산도 그리고 낮은 발열량으로 인해 디젤엔진에 직접적으로 적용하기가 어렵다. 따라서 이러한 낮은 물질적 특성을 개선하기 위해서 본 연구에서는 에탄올과 같은 알코올계 연료와 혼합하여 투입하였다. 알코올계 연료인 에탄올이 열분해유의 저장 및 보관성에도 도움을 줄뿐 아니라 점도를 낮춰주어 엔진에 적용하기 수월하게 만들기 때문이다. 열분해유-에탄올 혼합연료를 파일럿 분사한 디젤유 이후 분사하여 연소시켜 이때의 연소 및 배기특성에 대해 고찰해 보았고, 그 결과로 미연탄화수소와 일산화탄소는 증가하는 경향을 띄지만 NOx와 PM이 현저히 줄어든 결과를 확인할 수 있었다. Recently, the depletion of fossil fuels, global warming and environmental pollution have emerged as a worldwide problem, and studies of new renewable energy sources have been progressed. Among the many renewable energy sources, the use of bio fuel has the potential to displace fossil fuels due to low price, easy to handle, and the abundant sources. Pyrolysis oil (PO) derived from waste wood and sawdust is considered an alternative fuel for use in diesel engines. On the other hand, PO is limited to diesel engines because of its low cetane number, high viscosity, high acidity, and low energy density. Therefore, to improve its poor properties, PO was mixed with alcohol fuels, such as ethanol. Early mixing with ethanol has the benefit of improving the storage and handling properties of the PO. Furthermore, a PO-ethanol blended fuel was injected separately, which can be fired through pilot-injected diesel in a dual-injection diesel engine. The experimental results showed that the substitution of diesel with blended fuel increases the amount of HC and CO, but reduces the NOx and PM significantly.
CNG 혼소율 변화에 따른 디젤엔진의 성능 및 연소 특성에 관한 연구
장형준(Hyeong-Jun Jang),이선엽(Sun-Youp Lee),김창기(Chang-Gi Kim),조정권(Jeong-Kwon Cho),임종한(Jong-Han Lim),윤준규(Jun-Kyu Yoon) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.5
전 세계적으로 천연가스 시장에서는 천연가스의 저열량화 추세로 뚜렷하게 변화되고 있다. 이러한 추세는 국내의 천연가스 열량기준에 변화를 가져왔으며, 낮은 열량의 천연가스 도입으로 인해 현재 사용되고 있는 가스기기의 성능에도 변화가 있을 것으로 예측된다. 따라서 본 연구에서는 혼소엔진의 연소특성을 파악하기 위해 CNG 혼소율 변화를 이용하여 열효율, 도시평균유효압력 변동계수 및 열방출 특성을 고찰하였다. CNG 혼소율은 투입되는 연료의 총합 대비 공급되는 천연가스연료의 에너지로 계산하여 천연가스연료가 디젤연료를 대체하는 비율로 정의하였다. 엔진 실험조건으로는 공급되는 천연가스의 발열량은 10,400 ㎉/N㎥이며, 1800 rpm/500 N·m의 엔진 운전조건에서 디젤연료의 분사시기는 BTDC 16°CA, 분사압력은 85 ㎫로 설정하여 엔진의 성능 및 연소 실험을 진행하였다. 엔진 실험결과로 CNG 혼소율이 변화함에 따라 공급되는 디젤 연료량 역시 변화하고, CNG 혼소율이 증가할수록 디젤 연료량이 감소함으로써 점화에너지가 줄어들어 점화지연기간이 길어지는 연소특성을 나타내며, 이로 인해 엔진의 열효율과 출력도 감소하는 경향을 보였다. 그러나 연소안정성은 5% 미만으로 안정적인 엔진의 연소상태를 보여 실험의 신뢰성을 확보할 수 있었다. In the international natural gas market, natural gas has markedly low calories. The domestic calories standard of natural gas was changed and the performance and efficiency of many industrial machines using natural gas were affected because of low caloric natural gas. Therefore, in this study, a dual fuel engine fueled with natural gas and diesel was tested to examine the effects of the CNG substitution rate on the combustion characteristics, such as thermal efficiency, COVimep and heat release rate. The CNG substitution rate was defined as the ratio of CNG instead of diesel, which was calculated as the total energy. The conditions of the tested engine were fixed 1800 rpm/500 N·m. In addition, diesel fuel was injected at 16°CA BTDC and the fuel pressure was fixed at 85 ㎫; the lower heating value of CNG was 10,400 ㎉/N㎥. The results of the engine test showed that the amount of diesel fuel was changed according to the CNG substitution rate. Therefore, when the substitution rate was increased, the amount of diesel fuel was decreased, which affected the energy for ignition. In addition, the ignition delay duration was increased, which affected the thermal efficiency and torque. On the other hand, the COVimep was less than 5% and a stable combustion state of the engine was shown.
상용드론 시범운용 사례를 통한 신기술적용 체계 획득절차 개선안 수립
김무근(Mu-Geun Kim),김영훈(Young-Hoon Kim),이근호(Geun-Ho Lee),조정권(Jeong-Kwon Cho) 한국해군과학기술학회 2022 Journal of the KNST Vol.5 No.2
The Korean government is implementing various policies for the development of the commercial drone industry, and the military is also supporting industrialization through rapid acquisition procedures and commercial product demonstration procedures in order to quickly apply a civilian high-tech system into the military field. Recognizing that the need-based acquisition procedure is not suitable for the military field of rapidly developing civilian technology, a system with new technology can be tested after pre-purchase even if the requirements are not established. In this paper, various acquisition procedures applied by the military were investigated, and the current acquisition procedures were analyzed through the operation of commercial products. Through this, the revised acquisition procedure that can be applied to the technology-based military field was shown.