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건설기계 Fast Warm-up System용 ATF Heater 설계 및 성능 평가
류한(Han Ryu),허형석(Hyungseok Heo),배석정(Sukjung Bae),이준용(Junyong Lee),박승욱(Seunguk Park) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Fuel economy and CO₂ emission regulations have been reinforced because of depletion of fossil fuel and environmental pollution. Construction equipments are operated primarily on high speed and high load conditions resulting in more emission of CO₂ compared to cars. However, the technology development about the improvement of the fuel economy is insignificant in the field of construction equipment. If the engine and oil of construction equipments are fast warmed up, fuel economy of construction equipment could be even greater. The main objective of this paper is Fast warm-up system for forklift truck. Fast warm-up system layout is consist of EHR unit for waste heat recovery, ATF heater to warm-up auto transmission fluid and EGR cooler HF heater to recover waste heat of EGR and warm-up working fluid. This paper deals with CFD analysis and performance experimental evaluation of the ATF heater which is the heat exchanger in fast warm-up system being developed for forklift truck to warm-up auto transmission fluid with engine coolant.
PIV 유동 계측을 통한 자동차 프런트 엔드 쿨링 팩 시스템의 외부 유동특성 평가
허형석(Hyungseok Heo),한창평(Changpyung Han),박경석(Kyoungsuk Park),이기수(Geesoo Lee),배석정(Sukjung Bae),원종필(Jongphil Won) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.6
The major trend in global automotive market is changing drastically in the way that a vehicle FECPS (Front End Cooling Pack System) is designed and manufactured as an assembly part. The system can encompass many functions, be assembled into a vehicle as a module, and reduce the production cost as well as time. The FECPS consists of an impact beam, an aluminum condenser and a radiator, a carrier and a cooling fan with a BLDC motor. In order to predict the performance of a FECPS accurately, it is essential to properly model the air flow field through various heat exchangers, such as a condenser or a radiator. In this study, the flow field of the system is measured by a PIV (Particle Image Velocimetry) system. The result is compared with that measured with multi-channel anemometer.
The Effects of Laughter Therapy Interventions for Smartphone Addicts
Wonjae Choi,Junhyuck Park,Hyunkyung Jung,Jongeun Yim,Seungwon Lee,Sukjung Han,Sugjong Park,HyeonCheol Jeong 보안공학연구지원센터 2016 International Journal of Bio-Science and Bio-Techn Vol.8 No.4
Laughter or humor is a beneficial intervention among healthy individuals for general health. Laughter therapy is one of preventive medicine, which is important strategy help to promote wellness or relieve emotional stresses. This study aimed to investigate the effects of laughter therapy on autonomic nervous system activity, stress, and emotions in smartphone addict. The participants with addict or addict risk of smartphone were recruited and randomly allocated into laughter therapy group (n=30) and control group (n=12). Laughter therapy group were conducted laughter therapy program which is comprise of opening, experiencing laughter and closure for 60 min per a day, 3 times a week, for 4 weeks. The assessments were completed before and after the program. The heart rate variability analysis was used to assess the autonomic nervous system activity and stress, University of Rhode Island change assessment for readiness for change, and positive and negative affect scale for current mood state. Laughter therapy group improved significantly to the autonomic nervous system activity and stress compared with control group (p<0.05). And positive affect scale scores were improved significantly after conducting laughter therapy (p<0.05). Thus, these founds suggest that laughter therapy can improve the autonomic nervous system activity and positive affect scale scores, and relieve emotional stress for smartphone addict. Further study should consider applying of long-term laughter therapy for relieve of addict.