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Flexibility on storage-release based distributed hydrologic modeling with object-oriented approach
Kang, Kwangmin,Merwade, Venkatesh,Chun, Jong Ahn,Timlin, Dennis Elsevier 2016 Journal of hydrology Vol.540 No.-
<P><B>Summary</B></P> <P>With the availability of advanced hydrologic data in public domain such as remote sensed and climate change scenario data, there is a need for a modeling framework that is capable of using these data to simulate and extend hydrologic processes with multidisciplinary approaches for sustainable water resources management. To address this need, a storage-release based distributed hydrologic model (STORE DHM) is developed based on an object-oriented approach. The model is tested for demonstrating model flexibility and extensibility to know how to well integrate object-oriented approach to further hydrologic research issues, e.g., reconstructing missing precipitation in this study, without changing its main frame. Moreover, the STORE DHM is applied to simulate hydrological processes with multiple classes in the Nanticoke watershed. This study also describes a conceptual and structural framework of object-oriented inheritance and aggregation characteristics under the STORE DHM. In addition, NearestMP (missing value estimation based on nearest neighborhood regression) and KernelMP (missing value estimation based on Kernel Function) are proposed for evaluating STORE DHM flexibility. And then, STORE DHM runoff hydrographs compared with NearestMP and KernelMP runoff hydrographs. Overall results from these comparisons show promising hydrograph outputs generated by the proposed two classes. Consequently, this study suggests that STORE DHM with an object-oriented approach will be a comprehensive water resources modeling tools by adding additional classes for toward developing through its flexibility and extensibility.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The STORE DHM is developed by object-oriented approach in GIS. </LI> <LI> The STORE DHM is applied to simulate hydrological processes with multiple classes. </LI> <LI> The STORE DHM can be updated without changing main frame. </LI> <LI> The NearestMP and KernelMP are proposed for evaluating STORE DHM flexibility. </LI> </UL> </P>
수소첨가가 gasoline HCCI 연소특성에 미치는 영향에 관한 RCM을 이용한 실험적 연구
안현수(Hyunsoo An),전광민(Kwangmin Chun),송순호(Soonho Song) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Gasoline homogeneous charge compression ignition (HCCI) combustion enables internal combustion engines to achieve higher thermal efficiency and lower NOx emissions than conventional gasoline and diesel engines. To operate an HCCI engine stably, combustion control is crucial. One of the method to control HCCI combustion is using additives. In this study, hydrogen was used as an additive. Using a Rapid Compression Machine (RCM), an experimental tool that can simulate the single compression stroke of an internal combustion engine, ignition delay times of blended hydrocarbons (n-heptane + iso-octane) were measured over a various range of equivalence ratio (Ø = 0.3, 0.5, 0.7, 1.0), octane number (0, 50, 75, 100), and percentage of heat value of H2 additive for fuel (3, 5, 7, 10%). The result showed that the hydrogen as an additive, retards the auto-ignition timing of hydrocarbons. The effective ignition control by hydrogen can expand the operation range of equivalence ratios and octane number.
LPG와 Gasoline을 이용한 직접분사식 엔진에서의 성층연소 특성 비교에 관한 기술 연구
유창한(Changhan Yu),전광민(KwangMin Chun) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
GDI engines are concerned as future promising concept for SI engine because of its stratified charge combustion. However, it still has a few problems for example, NOx, PM and stability during transient operating range. So, a possibility of using LPG(Liquefied Petroleum Gas), which is regarded as clean alternative energy, in a direct injection engine was studied focusing on was studied focusing on performance. In the study and release rate of LPG calculated form pressure data were higher than of gasoline since LPG has higher Q_L_H_V and combustion of LPG was faster than that of gasoline.
[디젤엔진부문] Fe 첨가제방식 매연여과장치의 재생 평형온도(BPT) 특성에 관한 연구
박상현(Sanghyun Park),전광민(Kwangmin Chun),조규백(Guyback Cho),정용일(Youngil Jeong) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
The regeneration characteristic of Fe-based fuel additive type DPF system was studied. Fuel additive type system, with the catalytic DPF systems, is being estimated the most eligible technology for the measure of PM reduction because of passive and low temperature regeneration. However, when exhaust gas temperature lasts for a long period beneath the regeneration temperature, the increasement collected PM causes rapid and abnormal combustion and results in filter damages, which is called stochastic regeneration, because passive type DPF system does not have control mechanism during the regeneration process.<br/> For the feasibility study for the cause and measures of stochastic regeneration, regeneration performance in SiC filter was investigated according to the engine operating conditions and fuel additives concentration variation. Also the measurement technique for balance point temperature suggested by DESCE was confirmed useful to use regardless the testing path during measurement.<br/>
스파크플러그 이온신호의 특성 및 연소압력신호와의 상관관계에 관한 실험적 연구
함윤영(Yunyoung Ham),전광민(Kwangmin Chun) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Recently attention has focused upon the development of inexpensive sensing devices which can closely monitor<br/> the combustion process in order to reduce pollutant emissions and improve fuel economy of the engine. The ion<br/> signal is one of the best ways to extract all of the performance which the engine itself has. In this paper, the ion signal<br/> is obtained by using the spark plug as a sensor while acquiring the cylinder pressure simultaneously. The test results<br/> show that when spark timing is advanced, both of chemical and thermal ion signals are increased and for the low<br/> engine load, the thermal ion signal is too low to distinguish from chemical ion. At the misfire condition, the ion<br/> signal does not occur completely. And it is confirmed that the thermal ion peak location correlates quite well with the<br/> cylinder pressure maximum location under high load condition.