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EFFECT OF TURBINE UPSTREAM GEOMETRY ON PULSATING FLOW AND TURBOCHARGED SI-ENGINE PERFORMANCE
김제영,Chiong Meng Soon,Rajoo Srithar 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.2
The pulsating exhaust flow propagates through the exhaust line upon opening of exhaust valves while carrying a high amount of energy (high pressure and temperature). The amount of energy delivered to the turbine could be affected by turbine upstream geometry along with the propagation. Therefore, in this study, the impact of the turbine upstream geometry (diameter, length of exhaust runner, and exhaust manifold volume) on pulsating flow and engine & turbocharger has been investigated using 1D engine simulation packages, AVL-BOOST. A validated 1-liter 3-cylinder SI-engine model was utilized as a base engine model. The simulation captured how different geometry influences the pulsating pressure profile and the impact on system-level performance and behavior. The current research highlighted that the exhaust manifold volume is strongly associated with exhaust resistance, scavenging, pulsation, knocking, and fuel economy. By minimizing unnecessary volume in the exhaust manifold, it presents high potentials to improve low-speed torque (~15 %), fuel consumption (~2.4 %), brake thermal efficiency (~1.4 %), scavenging and knock resistance against the baseline model.
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알코올 중독자의 우울과 불안 감소를 위한 미술치료 사례연구
김제영,오가영 한국미술치료학회 2015 美術治療硏究 Vol.22 No.2
본 연구의 목적은 미술치료가 알코올 중독자의 우울과 불안 감소에 효과가 있는지 살펴보고자 하였다. 연구대상은 W군에 위치한 알코올전문병원에서 DSM-5에 의거해서 알코올 중독으로 진단을 받고 입원치료 중인 환자이다. 또한, 우울척도(BDI)가 중한 우울 범위에 속하며, 불안척도(BAI)가 심한 불안 범위에 속하고 미술치료를희망하고 참여가능 한 2명을 연구대상으로 선정하였다. 미술치료를 실시(주 1회, 80분, 총 12회기)하기 전과 실시 후에 우울척도(BDI)와 불안(BAI)척도 검사 그리고 그림검사(DAS, KHTP)를 실시하였으며, 결과는 다음과 같다. 첫째, 미술치료를 통해 내담자들의 우울척도(BDI) 점수가 감소하였으며, DAS의 사전에 비하여 사후그림의내용이 긍정적으로 나타났다. 둘째, 미술치료를 통해 내담자들의 불안척도(BAI) 점수가 감소하였으며, KHTP의사전에 비하여 사후 그림검사에서 긍정적인 변화가 나타났다. 마지막으로, 회기가 진행 될수록 내담자들은 내면을 표출, 인식하는 과정을 통해 안정감을 찾아가게 되어 우울과 불안적 행동이 감소된 것을 살펴 볼 수 있었다. 따라서, 본 연구의 미술치료 프로그램이 알코올 중독자의 우울, 불안을 감소시키는데 효과가 있었음을 알수 있었다. The purpose of this study was to examine how art therapy affects alcoholic patients in terms ofdecreasing depression and anxiety. Study subjects who were selected were alcoholic patients who werediagnosed and cured as alcoholics in accordance with the DSM-5 and were admitted to the hospital, whichis an alcohol specialty hospital located in 'W' District. These patients had serious depression and severeanxiety scores on the BDI and BAI and wanted to participate in art therapy action. Two people wereselected as study subjects. Both before and after the art therapy (once per week, 80 minutes per session fora total 12 sessions), the researchers administered the BDI and BAI and drawing tests (DAS, KHTP).Analysis of the results are as follows. First, the clients revealed a reduction in depression (as measuredthrough the BDI) through art therapy, and there were positive individual changes in the DAS picture testsbefore and after the therapy. Second, the clients revealed a reduction in the anxiety (as measured with theBAI) through art therapy, and there was positive individual change in the KHTP picture tests before andafter the therapy. Therefore, it was observed that the art therapy programs had an effect in reducing thedepression and anxiety of alcoholics.
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한국 EFL 학생들의 영어 자음 구별: 순음, 설음, 연구개음을 중심으로
김제영 중앙대학교 외국학연구소 2013 외국학연구 Vol.- No.24
This paper investigates Korean EFL learners’ perception errors. 32 Korean college students were asked to perform a multiple-choice identification test. They identified real words and nonwords with the target consonants /p, b, f, v, ɵ, ð, t, d, s, z, k, g/ in 2 different locations: initial onset position and final coda position. The result of this study is summarized as follows. First, the correct percentage of the target sounds in initial onset position was higher than final coda position. Second, the correct percentage of the target sounds in stop was higher than fricative. Finally, the correct percentage of the target sound in alveolar was highest, followed by that in velar, which in turn followed by that in bilabial, which in turn followed by that in labiodental. The correct percentage of the target sounds was lowest in interdental. It was also found that Korean participants had a great difficulty identifying English /f, v, ɵ, ð/, which are novel in Korean. The perception patterns were accounted for by the markedness.
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김제영,이성영,최재훈,박양덕 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.5
Carbon solid was prepared from dormant mesophase pitch (DMPP) without using a binder and its properties were characterized. DMPP powder was stabilized with air or nitric acid in pretreatment stage so that it might not soften in later heat ttreatment stage. Optimum sintering properties were obtained from carbon powder with 2.36∼2.38 of C/H atomic ratio and 1.27∼1.40 of C/O atomic ration in air stabilization. In nitric acid stabilization, optimum sintering properties were obtained when 20∼40 vol.% of nitric acid solution was used. Compressive strength increased up to 1200$^{\circ}C$ of heat treatment temperature, and the highest compressive strength and bulk density of carbon solid from DMPP were 3000 kgf/㎤, respectively. The optical properties of carbon solid obtained was fine mosaic structure. Carbon solid after graphitization showed the properties of hard carbon due to stabilization and its shore hardness was 120.
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Lithium ion Battery Materials for EV, 2025
김제영 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The unending demand for long range driving EV stimulates the development of high energy density Li ion battery with significant reduction in cost, which will be possible through another innovation in materials technologies. Here, I would like to discuss about future challenges (range, cost, fast charging) of Li ion battery and materials for EV, 2025.
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김제영,박지수,손진곤,Kim, Jeiyoung,Park, Ji Su,Shon, Jin Gon 한국정보처리학회 2020 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.9 No.11
Based on the analysis of physical and learning characteristics and requirements of the silver generation, a video English dictionary was developed and evaluated as English learning contents. The video English dictionary was developed using OCR as an input method and video as an output method, and 17 silver generations were evaluated for academic achievement, learning satisfaction, and ease of use. As a result of the analysis, both the text English dictionary and the video English dictionary showed high learning satisfaction, but the video English dictionary showed higher results than the text English dictionary in an academic achievement and ease of use. 본 논문은 실버세대 영어학습자를 위한 모바일 학습 콘텐츠를 구현하고 이를 평가하여 이들을 위한 콘텐츠 설계시 고려해야 할 사항에 대해 분석하고자 하였다. 실버세대의 신체적, 학습적 특징과 요구사항 분석을 근거로 하여 영어학습 콘텐츠로 동영상 영어사전을 개발하였고 이를 평가하였다. 동영상 영어사전은 입력방식으로 OCR을, 출력방식으로 동영상을 활용하여 개발하였고 17명의 실버세대들을 대상으로 학업성취도, 학습만족도, 사용의 용이성을 평가하였다. 분석결과 문자 영어사전과 동영상 영어사전 모두 학습만족도가 높은 것으로 나타났으나 학업성취도와 사용의 용이성에서는 문자로 된 영어사전보다 동영상 영어사전이 더 높은 결과를 나타냈다.
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