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고등학교 과학 선택 과목의 운영에 대한 학생과 교사의 인식 조사
이명준 ( Myungjun Lee ),심재호 ( Jaeho Sim ) 부산대학교 과학교육연구소 2016 교사교육연구 Vol.55 No.4
이 연구의 목적은 교사와 학생들의 고등학교 과학 선택 과목의 운영에 대한 인식을 알아보는데 있다. 선택 중심 교육과정은 제7차 교육과정에 명시된 후, 현장에서 지금까지 실행되어 오고 있다. 하지만 본 연구 결과에 의하면 고등학교 학생이 원하는 과목 선택이 제대로 이루어지 지지 못하고 있으며, 각 학교의 교육과정 운영의 편의성에 의해 왜곡 되어져 왔음을 보여준다. 이는 국가 교육과정이 실행 가능성을 충분히 고려하지 않고 이론적 논리적 측면에 의해 만들어졌음을 나타낸다. 달리 말하면, 국가 교육과정이 선택 중심 교육과정을 지지하는 재정적, 행정적인 여건과 단위 학교의 현실을 충분히 고려하지 않고 만들어진 것으로 보인다. 또한 미래의 소비자인 학생들에 대한 충분한 고려도 없는 것으로 보인다. 본 연구 결과는 부주의한 교육적 권위가 학생들이 공부하고 싶은 과목을 배제하였고, 교육 정책은 학생들의 주요 요구와 일치하지 않음을 보여준다. This study identified students and teachers perceptions on the management of high school science elective curriculum. The selection-centered curriculum has been practiced in each unit school since it was presented in the 7<sup>th</sup> national curriculum. However, the results of this research shows that the 7<sup>th</sup> national curriculum has been distorted by the convenience of management of each school`s curriculum because it does not focus on the students-oriented selection. The results of this study shows that the national curriculum was largely created based on theoretical and logical viewpoints without fully considering the possibility of its` implementation. In other words, it is possible that it was designed without sufficient examination of the reality of each unit school, and its financial and administrative support to hold up the selection-centered curriculum. The results of this study also suggest that the 7<sup>th</sup> national curriculum does not sufficiently consider the needs of the students as it excluded subjects students want to study, and the educational policies were not in accord with the principal needs of students.
Tier2Bin5 대응 NOx Storage Catalyst 적용 2.2L 디젤 엔진에서의 에미션 개발
이명준(Myungjun Lee),이흥우(Hyeungwoo Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The LNT(Lean NOx Trap) system has been developed for NOx reduction to meet Tier2 Bin5 by using the modified R-2.2 standard Engine. The rich mode combustion in the engine has been developed for the wide operating range despite of low compression ratio. It can be accomplished by adjusting air and FIE system, mainly by increasing attached-post-injection quantity. The A/F (Air/Fuel) ratio has been sustained by controlling the attached-post-injection quantity. The neutral transition between lean mode and rich mode combustion has been completed. The change in noise and torque cannot be recognized by the driver during the transition of combustion mode (lean/rich/lean). The transition procedure has been finished within about 1s for whole operating range. The regeneration pattern decides where the rich mode should be realized. It has been calibrated for FTP test mode to obtain proper NOx conversion rate to meet Tier2Bin5 considering the fuel penalty and THC slip. The total rich mode time during FTP mode was around 30s and the NOx conversion rate of 92% has been realized with bench aged NSC(NOx Storage Catalyst) appropriate to 50k mileage.
중심전극에서 연료를 분사하는 스파크플러그에 의한 예혼합기의 연소특성
박우영(Wooyoung Park),이명준(Myungjun Lee),염정국(Jeongkuk Yeom),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
This study proposes a new stratified charge system for low emission and over lean burn. Combustible mixture was induced around sparkplug using a spherical piston cavity and up-right straight port in the genernl method of strntified charge. In this study, method of new stratified charge is to use Injector-sparkplug. This system inject fuel of extremely small quantities and ignite mixture around sparkplug gap. Injector-sparkplug was fitted in the visualized constant volume chamber. The combustion characteristics was compared with conventional ignition method and this method. We examined combustion pressure and lean misfiring limit, visualized combustion flame according to equivalence ratio. As results of this study, in case of using Injector-sparkplug, initial flame propagation speed was increased and total combustion period was reduced in the over lean bum the same equivalence ratio. These phenomena present more remarkable under conditions of lean equivalence ratio and lean misfiring limit was extended.
미소영역 성층혼합기 유도를 위한 스파크플러그에 관한 연구
박우영(Wooyoung Park),이명준(Myungjun Lee),염정국(Jeongkuk Yeom),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
This study proposes a new stratifide charge system for low emission and over lean bum. Combustible mixture was induced around sparkplug using a spherical piston cavity and up-right straight potr in the general method of stratified charge. In this study, a method of new stratified charge is to use injector-sparkplug. This system injects fuel of extremely small quantities and ignite mixture around sparkplug gap. Injector-sparkplug was fitted in the visualized constant volume chamber. The combustion characteristics was compared with conventional ignition method and this method. We examined combustion pressure and lean misfiring limit, visualized combustion flame according to equivalence ratio.<br/> As results of this study, in case of using injector-sparkplug, initial flame propagation speed was increased and total combustion period was reduced in the over lean bum in the same equivalence ratio. These phenomena occurred clearly under the conditions of lean equivalence ratio. Furthrmore, the lean misfiring limit of mixture was estended by using the injector-sparkplug.
정적연소기에서 라디칼 유도분사를 이용한 예혼합기의 연소특성에 연구
박종상(Jongsang Park),최하성(Hasung Choi),이명준(Myungjun Lee),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
An experimental study was carried out to obtain fundamental data about effects of radical induced injection using a tiny sub-chamber on the combustion of pre-mixture in a constant volume chamber. The volume of the sub-chamber is set up to occupy less than 1.5% of that of whole combustion chamber, numerous narrow passage holes are arranged to induce simultaneous multi-point ignition in the main chamber by flame jets including radicals from the sub-chamber, and the equivalence ratio of pre-mixture in the main chamber and the sub-chamber is uniform. And also, the visualization of combustion is executed in the main chamber.<br/> In the case of radical ignition method(RI), the overall burning time including the ignition delay became very short compared with that of the spark ignition method(SI). AS the diameter of passage holes and the volume of the sub-chamber increase, the combustion characteristics of the RI becomes similar to that of the SI.