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이내현,오영일,이성열 대한기계학회 1994 대한기계학회논문집 Vol.18 No.12
To theoretically predict knock occurrence in S. I. engine as a function of engine design and operating parameters, transient local temperature and pressure, mixture density of flame front in combustion period are calculated. We next determined normal combustion period and auto ignition period of end gas using the prediction method on occurrence of spark knock which we suggested. We predict knock occurrence in S. I. engine by comparing consecutively normal combustion period with the auto ignition period of end gas in combustion period. Engine design and operating parameters such as compression ratio, engine speed, spark timing, inlet temperature and pressure are taken into account in this calculations. The predicted result are well matched with the experimental results in turbocharged engine. Therefore, this method will provide the systematic guideline for designing engines in view of knocking limits.
아파트단지에서 아파트 층별 및 배치구조에 따른 도로교통소음 평가
이내현,선우영,조기철,조경덕,조일형,Lee Nae-Hyun,Sun Woo-Young,Cho Ki-Chul,Zoh Kyung-Duk,Cho Il-Young 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.2
The road traffic noise has been increasing broader effects on urban areas as well as rural areas because of rapidly increasing traffic volume and newly-constructed roads. 10 sites in building development areas were selected and the noise levels were measured by the apartment floors and by the various block plans of apartment complex. The results showed that the highest traffic noise level was obtained at the 5 and 7 floors on the apartment floors. On the basis of 7 floor with the highest level, the correction coefficient obtained from noise reduction by each floor and measurement point was -5.54 dB(A)(1st floors), -0.96 dB(A)(3rd floors), -0.38 dB(A)(5th floors), 0.00 dB(A)(7th floors), -1.98 dB(A)(l0th floors), -3.10 dB(A)(13th floors), -3.45 dB(A)(15th floors). The level of road traffic noise in the arrangement construction of right angle was about 3.0 dB(A) at N-4 point and 2.1 dB(A) at N-6 point lower than that of a plan figure, respectively. The results suggested that application of correction coefficient obtained by the apartment floor and by the arrangement construction can be improved in road traffic noise.
‘노년공학(GT)의 기능성 게임 개발론’ 교과개발을 위한 학제간 수요 연구
이내현(Lee, Nae-Hyun),김경식(Kim, Kyung-Sik),장희동(Chang, Hee-Dong),박성준(Park, Seong-Jun),박창훈(Park, Chang-Hoon),강현구(Kang, Hyun-Koo),박현식(Park, Hyun-Sik),성은현(Sung, Eun-Hyun),김동주(Kim, Dong-Joo) 한국게임학회 2011 한국게임학회 논문지 Vol.11 No.2
노년시대를 대비하는 기능성 게임의 교과목을 개발하기 위하여 인문대학과 공과대학의 관련학과 학생들을 대상으로 연구진의 교과 항목들에 대해 중요성과 필요성에 대한 설문을 조사하였다. 양 대학의 학생들의 인지에 대한 공통점과 차이점을 분석하여 이를 토대로 융합 학제간 신 교과목을 개발하였다. 노인용 기능성 게임의 인식을 학생들에게 확산시키고자 본 교과목을 양대학의 교과과정에 포함시켜 시행하였다. For the development of a curriculum of the serious game for the elderly in preparation of senior society, we have surveyed students of both college of humanity and college of engineering for their perception of importance and necessity on the subjects prepared by this team. We analyzed their common points and different points, and developed a new interdeciplinary curriculum for students in both college. The curriculum has been opened in the last semester successfully.
균일 혼합기를 이용한 이론 공연비 직접분사 가솔린 엔진 개발에 관한 실험적 연구
이내현(N. H. Lee),유철호(C. H. Yu),최규훈(K. H. Choi) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.2
Lean burn gasoline engine is recognized as a promising way to meet better fuel economy. Lean burn engine is classified into port injection and direct injecton(DI), DI is more active technique for improving fuel economy with ultra -lean operation. Nowadays, port injected lean bum engine has been produced by many Japan maker. Also, DI engine is also possible for production owing to improvement in control technique of spray, flow air fuel ratio.<br/> DI engine uses either homogeneous stoichiometric mixture or stratified mixture by controlling injection timing to be early or late respectively. HM(homogeneous mixture) is worse than SM(stratified mixture) in view of ultra -lean operation in partial load and Nox reducion by using EGR control. But, HM has advanteges in cold starting and emission reduction during transient operation.<br/> This paper describes experimental variables and bench test results of HM GDI engine.<br/>
이내현(Nae Hyun Lee),박영민(Young Min Park),선우영(Woo Young Sun) 한국환경영향평가학회 2001 환경영향평가 Vol.10 No.4
Recently the road traffic noise has appeared as a significant environmental issue because of dramatic increase of vehicles and expansion of newly constructed road. Therefore, this study proposes the method that improves prediction factors and models through analysis of the existing road traffic noise prediction model. Prediction factors can be improved by establishing guideline for diffraction attenuation and applying daily traffic discharge, peak traffic discharge, and average traveling speed through an analysis of level service. Prediction must be made by periods of one or five years during 20 years. Prediction models also can be improved to include better prediction model through setting the database, establishing functional relation between physical properties and noise levels by acoustic analysis, and developing models for road traffic noise prediction in residential areas.