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An Empirical Study of Pedestrian-Vehicle Interaction Using Virtual Reality
Yoon Kyung Lee(이윤경),Hyoseok Bang(방효석),Mijin Kwon(권미진),Yong-Eun Rhee(이용은),Jeh-Kwang Ryu(유제광),Sowon Hahn(한소원) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
The purpose of this research was to explore gesture interface of pedestrian and to propose socially appropriate movement gestures for vehicles. We conducted an observational study in locations that had 1) high volume of traffic, 2) intersections where constant interactions between pedestrians and vehicles occur, 3) no traffic lights to regulate the flow of traffic. We then developed a virtual crossing task (VCT), with independent variables selected based on the behavioral patterns we observed from the preliminary study. We measured head direction, crossing time, and success rate in crossing. Based on our observation, the speed, the size of the vehicle, and the number of pedestrians were the main factors of change in pedestrian movements (e.g., stopping). In the experiment, participants were more likely to keep caution by changing their head direction to look around when the vehicle was small and slowly approached the crosswalk and when a companion was present. In conclusion, we suggest that the interaction between autonomous vehicles and pedestrians should be understood as social interactions: social institutions and cultural differences should be considered when designing a ‘socially’ appropriate gesture interface of autonomous vehicles.
The pricing of vulnerable foreign exchange options under a multiscale stochastic volatility model
Mijin Ha,Donghyun Kim,Ji-Hun Yoon 한국전산응용수학회 2023 Journal of applied mathematics & informatics Vol.41 No.1
Foreign exchange options are derivative financial instruments that can exchange one currency for another at a prescribed exchange rate on a specified date. In this study, we examine the analytic formulas for vulnerable foreign exchange options based on multi-scale stochastic volatility driven by two diffusion processes: a fast mean-reverting process and a slow mean-reverting process. In particular, we take advantage of the asymptotic analysis and the technique of the Mellin transform on the partial differential equation (PDE) with respect to the option price, to derive approximated prices that are combined with a leading order price and two correction term prices. To verify the price accuracy of the approximated solutions, we utilize the Monte Carlo method. Furthermore, in the numerical experiments, we investigate the behaviors of the vulnerable foreign exchange options prices in terms of model parameters and the sensitivities of the stochastic volatility factors to the option price.
Yoon, Jaehyuk,Kim, Mijin,Song, Soonho,Chun, Kwang Min Elsevier 2011 Journal of aerosol science Vol.42 No.6
<P><B>Abstract</B></P><P>Recently, the diesel engine particulate matter (PM) emission standard was changed from being based on mass to being based on both number and mass. However, it is difficult to determine the mass- and number-weighted distributions simultaneously because of the complex shapes of PM.</P><P>We studied a new method to determine the mass-weighted distribution of PM using the primary particle density, and compared it with two conventional PM measurement methods using effective density and gravimetric filtration. In the method developed, the primary particle size was measured using transmission electron microscopy (TEM)-calibrated laser-induced incandescence (LII) to detect changes in the primary particle size in real-time. The number-weighted distribution of aggregates was measured with a scanning mobility particle sizer (SMPS). The mass–mobility exponent and the effective density were determined with an impactor and the SMPS. The differences in the mass concentrations for each technique were between 3.1% and 29.9%.</P> <P><B>Highlights</B></P><P>► Measurement of number- and mass-weighted distribution of diesel PM is conducted. ► Primary particle density is used for mass calculation. ► Result is compared with conventional mass measurement techniques. ► The difference of mass concentration is 3.1–29.9%.</P>
LEE, Mijin,YU, Dohyeon,YOON, Jiseon,LI, Yinghua,LEE, Jonghyeon,PARK, Jinho Japanese Society of Veterinary Science 2009 The Journal of veterinary medical science Vol.71 No.1
<P>Both ehrlichioses and anaplasmoses are zoonotic, fatal infectious diseases that caused by ticks. White-tailed deer (<I>Odocoileus virginianus</I>) are important hosts for <I>Ehrlichia chaffeensis, Anaplasma phagocytophilum</I> and <I>Anaplasma</I>-like organisms. In the present study, an evaluation of infection with tick-borne pathogens was conducted using a PCR assay on the blood of a deer that expressed anorexia and decreased activity. The results of the PCR assay revealed natural co-infection of <I>E. chaffeensis</I> and <I>A. bovis</I> in the deer. This indicates that deer may be a natural reservoir of both <I>E. chaffeensis</I> and <I>A. bovis</I> in South Korea.</P>