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Modeling Inclement Weather Impacts on Traffic Stream Behavior

International Journal of Transportation Science and Technology 2012年第1期1卷 25-47页

作者： Hesham Rakha Mazen Arafeh sangjun park Charles E.Via Jr.Department of Civil and Environmental Engineering Virginia Tech Transportation Institute3500 Transportation Research PlazaBlacksburgVA 24061USA Virginia Tech Transportation Institute 3500 Transportation Research PlazaBlacksburgVA 24061USA

The research identifies the steady-state car-following model parameters within state-of-thepractice traffic simulation software that require calibration to reflect inclement weather and roadway *** research then develops procedures for calibrating non-steady state carfollowing models to capture inclement weather impacts and applies the procedures to the INTEGRATION software on a sample *** results demonstrate that the introduction of rain precipitation results in a 5%reduction in light-duty vehicle speeds and a 3%reduction in heavy-duty vehicle *** increase in the rain intensity further reduces light-duty vehicle and heavy-duty truck speeds resulting in a maximum reduction of 9.5%and 5.5%at the maximum rain intensity of 1.5 cm/h,*** results also demonstrate that the impact of rain on traffic stream speed increases with the level of congestion and is more significant than speed differences attributed to various traffic operational improvements and thus should be accounted for in the analysis of *** the case of snow precipitation,the speed reductions are much more significant(in the range of 55%).Furthermore,the speed reductions are minimally impacted by the snow precipitation *** study further demonstrates that precipitation intensity has no impact on the relative merit of various scenarios(*** ranking of the scenario results are consistent across the various rain intensity levels).This finding is important given that it demonstrates that a recommendation on the optimal scenario is not impacted by the weather conditions that are considered in the analysis.

关键词： weather intensity Stream

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Virginia Tech Comprehensive Power-based Fuel Consumption Model(VT-CPFM):Model Validation and Calibration Considerations

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International Journal of Transportation Science and Technology 2013年第4期2卷 317-336页

作者： sangjun park Hesham A.Rakha Kyoungho Ahn Kevin Moran aDepartment of Civil Engineering Chosun University309 Pilmun-daero Dong-gu Gwangju 501-759South Korea Charles E.Via Jr.Department of Civil and Environmental Engineering3500 Transportation Research PlazaBlacksburgVA 24061 Center for Sustainable Mobility Virginia Tech Transportation Institute3500 Transportation Research PlazaBlacksburgVA 24061 Nokia Here 425 West Randolph StreetChicagoIL 60606

A power-based vehicle fuel consumption model,entitled the Virginia Tech Comprehensive Power-based Fuel Consumption Model(VT-CPFM)that was developed in an earlier publication is validated against in-field fuel consumption *** study demonstrates that the VT-CPFMs calibrated using the EPA city and highway fuel economy ratings generally provide reliable fuel consumption estimates with a coefficient of determination in the range of *** importantly,both estimates and measurements produce very similar behavioral changes depending on engine load *** VT-CPFMs are demonstrated to be easily calibrated using publically available data without the need to gather in-field instantaneous data.

关键词： Consumption Power estimates

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Fuel Economy Impacts of Manual,Conventional Cruise Control,and Predictive Eco-Cruise Control Driving

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International Journal of Transportation Science and Technology 2013年第3期2卷 227-242页

作者： sangjun park Hesham A.Rakha Kyoungho Ahn Kevin Moran Department of Civil Engineering Chosun University 309 Pilmun-daero Dong-gu Gwangju 501-759South Korea Center for Sustainable Mobility Virginia Tech Transportation Institute 3500 Transportation Research PlazaBlacksburgVA 24061 Nokia Location and Commerce 425 West Randolph Street ChicagoIL 60606

The paper presents the results of a field experiment that was designed to compare manual driving,conventional cruise control(CCC)driving,and Eco-cruise control(ECC)driving with regard to fuel *** field experiment was conducted on five test vehicles along a section of Interstate 81 that was comprised of±4%uphill and downhill grade *** an Onboard Diagnostic II reader,instantaneous fuel consumption rates and other driving parameters were collected with and without the CCC system *** collected data were compared with regard to fuel economy,throttle control,and travel *** results demonstrate that CCC enhances vehicle fuel economy by 3.3 percent on average relative to manual driving,however this difference was not found to be statistically significant at a 5 percent significance *** results demonstrate that CCC driving is more efficient on downhill versus uphill *** addition,the study demonstrates that an ECC system can produce fuel savings ranging between 8 and 16 percent with increases in travel times ranging between 3 and 6 *** benefits appear to be largest for heavier vehicles(SUVs).

关键词： Cruise driving travel

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Engineering Geometric Electrodes for Electric Field-Enhanced High-Performance Flexible In-Plane Micro-Supercapacitors

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Energy & Environmental Materials 2023年第4期6卷 114-120页

作者： Jihong Kim Sung Min Wi Jong-Guk Ahn sangjun Son Hee Young Lim Yeonsu park Hye Ji Eun Jong Bae park Hyunseob Lim Sangyeon Pak A-Rang Jang Young-Woo Lee Department of Energy Engineering Soonchunhyang UniversityAsan 31538Korea Department of Chemistry Gwangju Institute of Science and TechnologyGwangju 61005Korea Jeonju Centre Korea Basic Science InstituteJeonju 54907Korea Prof.S.Pak School of Electronic and Electrical Engineering Hongik UniversitySeoul 04066Korea Division of Electrical Electronic and Control EngineeringKongju National UniversityCheonan 31080Korea

In plane micro-supercapacitors that are miniaturized energy storage components have attracted significant attention due to their high power densities for various ubiquitous and sustainable device systems as well as their facile integration on various flexible/wearable *** implement the micro-supercapacitors in various practical applications that can accompany solid state or gel electrolyte and flexible substrates,ions must be readily transported to electrodes for achieving high power ***,we show large enhancement in electrochemical properties of flexible,inplane micro-supercapacitor using sharp-edged interdigitated electrode design,which was simply fabricated through direct laser scribing *** sharp-edged electrodes allowed strong electric field to be induced at the corners of the electrode fingers which led to the greater accumulation of ions near the surface of electrode,significantly enhancing the energy storage performance of *** electric field-enhanced in-plane micro-supercapacitor showed the volumetric energy density of 1.52 Wh L^(−1)and the excellent cyclability with capacitive retention of 95.4%after 20000 *** further showed various practicability of our sharp-edged design in micro-supercapacitors by showing circuit applicability,mechanical stability,and air *** results present an important pathway for designing electrodes in various energy storage devices.

关键词： electric field enhancement flexible energy storage device microsupercapacitors sharp electrodes

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A Study on Patients Effective Dose on Simple Abdomen Examination

A Study on Patients Effective Dose on Simple Abdomen Examina...

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2009中华医学会影像技术分会第十七次全国学术大会

作者： Keunhwa Kim Sangman park Taeheum Cho Eunha Kim sangjun Lee Misub Ahn Heuisuk Moon Namsoo Cho Department of Radiology Samsung Medical Center

Objective:The purpose of this study is to recognize dangerous by radiation exposure on plain radiography as measured patient’s effective dose on simple abdomen exam.

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