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- 저자 : 장한수(Chang.Han-Soo) (검색결과 5 건)
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장한수(Chang.Han-Soo),박상준(Park.Sang-Joon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
In this study, we investigated HC level by changing cylinder head intake port shape, piston and intake valve size in 2.0^ℓ DOHC engine. Among these parameters tumble ratio and piston have strong impact on HC reduction.<br/> Based on test result the change spec of tumble ratio 0.7, modified piston and current inner seat diameter show excellent results.<br/>
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산업용 천연가스 수요관리 프로그램 최적화를 위한 동태적 시뮬레이션에 관한 연구
장한수(Han Soo Chang),최기련(Ki Ryun Choi) 한국환경경제학회·한국자원경제학회 2002 자원·환경경제연구 Vol.11 No.2
This paper summarizes the results of a study that assess how a demand side management (DSM) system addresses key economic and environmental challenges facing in the Korean natural gas sector considering; ·high discrepancies of seasonal consumption volume and of load factor in unmatured domestic LNG market, ·unfavorable and volatile international LNG market, imposing with the contestable take-or-pay contract terms, ·low profile of LNG and existence of market barriers against an optimal fuel mix status in the industrial energy sector. A particular focus of this study is to establish an `extended` DSM system in the unmatured gas market, especially in industry sector, that could play a key role to assure an optimum fuel mix scheme. Under the concept of `extended` DSM, a system dynamics modeling approach has been introduced to explore the option to maximize economic benefits in terms of the national energy system optimization, entailing different ways of commitments accounting for different DSM measures and time delay scenarios. The study concludes that policy options exist that can reduce inefficiencies in gas industry and end-use system at no net costs to national economy. The most scenarios find that, by the year 2015, it is possible to develop a substantial potential of increased industrial gas end-uses under more reliable and stable load patterns. Assessment of sensitivity analysis suggests that time delay factor, in formulating DSM scenarios, plays a key role to overcome various market barriers in domestic LNG market and provides a strong justification for the policy portfolios `just in time` (time accurateness), which eventually contribute to establish an optimum fuel mix strategy. The study indicates also the needs of advanced studies based on SD approach to articulate uncertainty in unmatured energy market analysis, including gas.
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박준영(Joon Yeong Park),장한수(Han Soo Chang),손경곤(Gyeong Gon Son),박재성(Jae Seong Park) 대한전자공학회 2025 대한전자공학회 학술대회 Vol.2025 No.6
With the increasing deployment of fuel cell electric commercial vehicles (FCECVs), which produce no harmful exhaust emissions, ensuring the safe use of hydrogen, the primary fuel source, has become paramount due to its high diffusivity and flammability. Accordingly, the reliability of hydrogen sensors, which play a critical role in detecting hydrogen leakage, is of growing significance.<BR/><BR/> This study aims to characterize the environmental exposure conditions of hydrogen sensors installed in a commercial FCECV (Hyundai Xcient) under real world driving scenarios. Vehicle operational data were acquired via CAN reverse engineering, and the exposure temperature and humidity near the hydrogen sensors were measured using external instrumentation.<BR/><BR/> Experimental evaluations were conducted under the Worldwide Harmonized Vehicle Cycle (WHVC) and steady-state driving conditions at a Proving Ground. The focus was placed on sensors positioned near the fuel cell stack and the hydrogen supply system to assess their exposure profiles.<BR/><BR/> The findings of this study are intended to provide foundational insights for the development of standardized test protocols for assessing the performance and reliability of hydrogen sensors in commercial FCECV applications.
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