선박용 디젤기관에 있어서 Scrubber를 이용한 EGR의 연소 특성에 관한 연구

임재근(Jae-keun Lim) 군산대학교 수산과학연구소 1998 水産科學硏究 Vol.- No.14

The effects of exhaust gas recirculation(EGR) on the characteristics of combustion, and SFC is experimentally investigated by four-cylinder, four-cycle and direct injection marine diesel engine. In order to reduce the soot contents in the recirculated exhaust gas to intake system of the engines, a soot removal system with a cylindrical-type scrubber which has water injector (it has 4 nozzles in 1.0 mm diameter) is specially designed and manufactured for the experimental system. The investigated results as follows. (1) The range of fluctuation in SFC is under 2.5% and larger at high load - high EGR rate than low load - low EGR rate. (2) The combustion pressure in cylinder is decreased with increasing EGR rate and decreasing rate is larger with increasing load. (3) Ignition is delayed with increasing EGR rate and it's term is longer with increasing load. (4) The accumulated quantity of heat release is slightly decreased with increasing EGR rate and the tendency of maximum rate of heat release is not constant.

초등 예비교사들이 자유 탐구 활동 중에 겪은 어려움 조사

임재근 ( Jae Keun Lim ),양일호 ( Il Ho Yang ),홍은주 ( Eun Ju Hong ),임성만 ( Sung Man Lim ),김순미 ( Sun Mi Kim ) 한국과학교육학회 2010 한국과학교육학회지 Vol.30 No.2

문제 해결과정에서 과학 영재아와 일반아의 뇌파 활성 분석

임재근 ( Jae Keun Lim ),권석원 ( Suk Won Kwon ) 경북대학교 과학교육연구소 2010 科學敎育硏究誌 Vol.34 No.1

이 연구의 목적은 문제 해결과정에서 과학 영재아와 일반아의 뇌파 활성 분석을 통해 그 특징을 조사하는 것이다. 이 연구의 대상자는 지역교육청 소속의 영재 교육원에 재학 중인 초등학생으로 6명과 같은 지역의 일반 아동 6명으로 전체 12명으로 대상으로 분석하였다. 뇌파 측정용 과제는 하노이 탑(Haniotower)으로 문제 해결 과정을 연구하는 효과적인 과제이다. 뇌파 측정 장비는 EEG System 으로 호주에서 개발한 장비를 이용하였다. 자료의 분석은 잡파(noise)를 최소화 하였고, 뇌파의 측정 위치는 10-20System 전극배치를 사용하였다. 뇌파의 분석 방법으로는 독립 성분 분석(Independent Component Analysis)과 상대 파워분석(Relative power analysis)을 사용하였다. 연구의 결과 영재아들은 눈뜨고 안정 상태에서도 일반아에 비해 안정도가 뛰어나 학습의 준비도가 높다는 것을 알 수 있다. 이는 문제 해결을 하기 위한 준비의 정도가 높아 학습의 효과가 뛰어난 결과로 나타는 것을 볼 수 있다. 또한 과제를 수행하는 과정에서도 영재아의 두뇌 활성화의 정도가 높아 전두엽과 후두엽 부위에서 유의미하게 높은 알파파가 형성됨을 알 수 있었다. 따라서 영재아의 뇌를 활성화 정도가 높은 과제를 개발하면 보다 높은 교육의 효과를 기대할 수 있을 것이다. 이 연구의 결과는 과학 영재 판별과 평가의 타당도를 높이며, 과학영재의 특성과 과학의 본질에 근거한 판별방법의 기초 자료로 활용 가능하다. The purpose of this study is to survey its characteristics through analyzing brain-wave activity in the scientifically-gifted and general children in the problem-solving process. The subjects of this study were 6 elementary school students, who are attending the institute of education for the gifted belonging to the regional office of education and 6 general children in the same region. The analysis was performed targeting total 12 people. As the task for measuring brain wave is Hanio tower, it is the effective task of researching into the problem-solving process. As the equipment of measuring brain wave is EEG System, it used equipment that was developed in Australia. The analysis of data was minimized noise. As a result of research, the gifted children are excellent in stable level compared to general people in a stable situation with opening the eyes, thereby being able to be known to be high in preparatory level for learning. This can be seen to be indicated as a result that the effect of learning is excellent due to being high in preparatory level for solving problem. Also, even in the process of performing task, the brain-activity level in the gifted children is high, thereby having been able to know that -wave is formed that is significantly high in the regions of frontal lobe and occipital lobe. Accordingly, given developing task that is high in brain activity level of the gifted children, the higher educational effect will be able to be expected.

연구논문 : 초등학교 과학 수업에서 교사와 학생 간에 과학 실험 목적 인식의 차이가 발생하는 원인 분석

임재근 ( Jae Keun Lim ),이소리 ( So Ri Lee ),김주영 ( Ju Young Kim ),양일호 ( Il Ho Yang ) 경북대학교 과학교육연구소 2010 科學敎育硏究誌 Vol.34 No.2

이 연구의 목적은 초등학교 과학 수업 시간에 수행되는 실험 목적에 대한 교사와 학생의 인식에 대한 차이가 발생하는 원인을 분석하는 것이다. 이를 위해 초등학교 6학년 10개 학급의 교사와 학생을 대상으로 반구조화된 심층 면담으로 통해 자료를 수집하였다. 면담의 범주는 크게 실험목적, 실험 목적의 지도 여부, 실험 수업 진행 방법, 평가 방법등 네 가지이다. 교사와 학생간에 실험 목적 인식의 차이가 발생하는 원인은 교사의 관점에서는 실험 목적에 대한 교사의 미지도, 교사가 의도한 실험 목적과 다르게 운영되는 실험 수업, 실험 목적과 유리되는 평가 방법의 문제에 기인한 것으로 나타났다. 실험 수업에서 교사가 의도한 실험 목적이 고려되어 지도되고 있지 않기 때문에 학생들이 실험 목적을 정확하게 인지하지 못하는 것이다. 교사들은 실험 활동을 통한 과학탐구능력의 향상을 중요하게 생각하고 있지만, 이것이 실험 수업을 통해 학생들에게 실질적으로 전달되지 못하고 있어 학생들이 과학탐구능력의 중요성을 인식하고 못하고 있다. 또한 타당한 평가도구나 방법의 부족으로 인하여 교사들은 실험의 중요한 목적인 학생들의 과학탐구능력을 중요한 부분으로 평가하지 못하고 있다. 따라서 탐구적 실험 중심의 과학-교수 학습이 효과적으로 이루어지기 위해서 초등교사들은 학생들에게 실험의 중요한 목적인 과학탐구능력을 강조하여 명시적으로 지도할 필요가 있다. The purpose of this study was to find out the factor that causes the difference on understanding the aim and perception of laboratory activities between teachers and students. For this study, in-depth interview was conducted for sixth grade students and teachers of 10 classes. The questionnaire of the interview can be divided into 3 sections: the aim of laboratory activities, whether teachers present the aim of laboratory activities, the method of laboratory class progress and the evaluation method. The factors that bring about the difference between the teachers and the students on perception of the aim are the absence of proper guidance on the aim of laboratory activities, the laboratory classes that the progress out of teachers` intention and evaluation method that is the performed without any relationship with the aim of the laboratory activities. Because the teacher-intended aim of laboratory activities is not properly presented, students can`t percept the accurate aim. Even though teachers recognize the importance of the improvement of science process skill acquired through laboratory activities, this is not delivered practically in the class and students also can`t percept the importance of science process skill.

船舶用 中速 디젤機關의 排氣 EMISSION에 對한 實驗的 硏究

임재근(Jae-kuen Lim) 군산대학교 수산과학연구소 1996 水産科學硏究 Vol.- No.12

To anaIyze and considerate on the exhaust emissions of medium speed marine diesel engine used heavy oil, the experiments are carried out at 6-measuring points on propeller curve with diesel oil and each different 4-heavy oil. Also, fuel injection timing is setted BTDC 17℃A, and intake air temperature is maintained uniformly at 45℃ to make the same operating condition. The results of this study can be summarized as follows, 1. Soot emission is generated in proportion to fuel density and residual carbon in fuel. 2. NOx emission is decreased in almost straight line in accordance with increasing of engine RPM and mean effective pressure. 3. CO₂ emission is generated in proportion to caron contents in fuel oil, that is, CO₂ emission of heavy oil is more than diesel oil because of much carbon contents. 4. SO₂ emission is generated wholly in proportion to sulfur contents in fuel oil.

디젤기관에 있어서 에멀젼 연료가 연소특성에 미치는 영향

임재근(J. K. Lim),조상곤(S. G. Cho),황상진(S. J. Hwang),유동훈(D. H. Yoo),서장원(J. W. Seo) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-

A study on the combustion characteristics by using Emulsion Fuel in Diesel Engine is performed experimentally. In this paper, the experiments are performed at engine speed 1800rpm, emulsion fuel ratio is 0%, 10%, 20%, and main measured items are specific fuel consumption, pressure, ratio of pressure rise, rate of heat release etc. The obtained conclusions are as follows. 1) Specific fuel consumption increase maximum 19.8% at low load, but is not effected at full load. 2) Ratio of pressure rise and rate of heat release are about the same in the case of 10% and 20% of emulsion fuel ratio. 3) Cylinder Pressure increase 11.7%, ratio of pressure rise increase 60.4% in case of emulsion fuel ratio 20% at full load. 4) Rate of heat release increase 76.9% in case of emulsion fuel ratio 20% at full load.

선박용 디젤기관에 있어서 Scrubber를 이용한 EGR의 연소 특성에 관한 연구

임재근(Jae-keun Lim) 군산대학교 수산과학연구소 2004 군산대학교 수산과학연구소 연구논문집 Vol.4 No.-

The effects of exhaust gas recirculation(EGR) on the characteristics of combustion, and SFC is experimentally investigated by four-cylinder, four-cycle and direct injection marine diesel engine. In order to reduce the soot contents in the recirculated exhaust gas to intake system of the engines, a soot removal system with a cylindrical-type scrubber which has water injector (it has 4 nozzles in 1.0 mm diameter) is specially designed and manufactured for the experimental system. The investigated results as follows. (1) The range of fluctuation in SFC is under 2.5% and larger at high load - high EGR rate than low load - low EGR rate. (2) The combustion pressure in cylinder is decreased with increasing EGR rate and decreasing rate is larger with increasing load. (3) Ignition is delayed with increasing EGR rate and it's term is longer with increasing load. (4) The accumulated quantity of heat release is slightly decreased with increasing EGR rate and the tendency of maximum rate of heat release is not constant.

디젤기관에서 바이오디젤 연료가 배기배출물 특성에 미치는 영항

임재근(J. K. Lim),조상곤(S. G. Cho),황상진(S. J. Hwang) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-

An experimental study is conducted to evaluate and compare the use of Biodiesel Fuel supplements at blend ratio of 10/90(BOF10) and 20/80(BOF20), in four stroke, direct injection diesel engine located at the authors' laboratory. specifically this Biodiesel is produced with soybean oil at the authors' laboratory. The tests are conducted using each of the above fuel blends, with the engine working at a speed of 1800rpm and at a various loads. In each test, specific fuel consumption, exhaust emissions such as nitrogen oxides(NOx), carbon monoxide(CO) and Soot are measured. The results of investigation at various operating conditions are as follows (1) Specific fuel consumption is increased average 0.82%, maximum 1.09% at load 25% in case of BOF10, and average 1.38%, maximum 1.73% at load 25% in case of BOF20. (2) CO emission is decreased average 4.63%, maximum 6.73% at load 0% in case of BOF 10, and average 7.40%, maximum 9.26% at load 0% in case of BOF 20. (3) NOx emission is increased average 2.49%, maximum 3.77% at load 0% in case of BOF10, and average 4.02%, maximum 5.66% at load 0% in case of BOF20. (4) Soot emission is decreased average 7.75%, maximum 10.20% at load 50% in case of BOF10, and average 12.54%, maximum 15.40% at load 50% in case of BOF20.

디젤기관에서 바이오디젤 혼합유의 연소특성에 미치는 연료분사시기의 영향

임재근(J. K. Lim),조상곤(S. G. Cho) 한국동력기계공학회 2012 동력시스템공학회지 Vol.16 No.3

SPC관련 KS의 제개폐 및 KS A ISO 2859-3에 대한 고찰

임재근(Jae-Geun Lim),조병선(Byung-Sun Cho),정수일(Soo-Il Jung) 한국산업경영시스템학회 2005 한국산업경영시스템학회지 Vol.28 No.2

As a result of globalization process and TBT agreement, KS is also being revised, reestablished and some are abolished according to international standards such as ISO, IEC, etc. Conventional KS sampling inspection standards contained many different procedures from ISO, but recently, to match with international standards, all the rest of the standards except KS A 3102, 3104, 3151 were abolished, and the even the ones being in use still are also scheduled and be revised. Especially, KS A 3101, KS A 3105, KS A 3109, which were used most frequently in Korea were abolished, and the KS A ISO 2859-0~3 which coincide with ISO standards were established 3 years ago, but the implementation rate is very slow, Starting next year the national examination for qualification process for the product quality related item will the started and the preparation is underway. This study will investigate the recent sampling inspection process of KS as well as SPC related KS overhaul problem and present the data to help workers in SPC related field. One of the main example will be on KS A ISO 2859-3 and will attempt to help those medium and small sized companies with examples.