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Optimal Signal Control Algorithm for Signalized Intersections under a V2I Communication Environment
Han, Eum,Lee, Hwan Pil,Park, Sangmin,So, Jaehyun (Jason),Yun, Ilsoo Hindawi Limited 2019 Journal of advanced transportation Vol.2019 No.-
<P>This study aims to develop an optimal signal control algorithm for signalized intersections using individual vehicle’s trajectory data under the vehicle-to-infrastructure (V2I) communication environment. The optimal signal control algorithm developed in this study consists of three modules, namely, a phase group length computation module, a split distribution module, and a phase sequence assignment module. A set of analyses using a microscopic simulation model, VISSIM, was conducted for evaluating the effectiveness of the V2I-based optimal signal control algorithm proposed in this study. The analysis results show that the performance of the V2I-based optimal signal control algorithm is superior to the actuated as well as the fixed signal control methods in an isolated intersection and a 2X3 signalized intersection network. In addition, this study investigated the minimum market penetration rate of V2I equipped vehicles for which the V2I-based optimal signal control algorithm is applicable.</P>
HAN, Young-Shin,KIM, SoYoung,KIM, TaeKyu,JUNG, Jason J. The Institute of Electronics, Information and Comm 2010 IEICE transactions on information and systems Vol.93 No.7
<P>We exploit a structural knowledge representation scheme called System Entity Structure (SES) methodology to represent and manage wafer failure patterns which can make a significant influence to FABs in the semiconductor industry. It is important for the engineers to simulate various system verification processes by using predefined system entities (e.g., decomposition, taxonomy, and coupling relationships of a system) contained in the SES. For better computational performance, given a certain failure pattern, a Pruned SES (PES) can be extracted by selecting the only relevant system entities from the SES. Therefore, the SES-based simulation system allows the engineers to efficiently evaluate and monitor semiconductor data by <I>i</I>) analyzing failures to find out the corresponding causes and <I>ii</I>) managing historical data related to such failures.</P>
Han, Min Cheol,Seo, Jeong Min,Lee, Se Hyung,Kim, Chan Hyeong,Yeom, Yeon Soo,Nguyen, Thang Tat,Choi, Chansoo,Kim, Seonghoon,Jeong, Jong Hwi,Sohn, Jason W. Professional Technical Group on Nuclear Science 2016 IEEE transactions on nuclear science Vol.63 No.6
<P>We propose a new type of computational phantom, the '4D voxel phantom,' for realistic modeling of continuous respiratory motion in Monte Carlo dose calculation. In this phantom, continuous respiratory motion is realized by linear interpolation of the deformation vector fields (DVFs) between the neighboring original phases in the 4D CT data of a patient and by subsequent application of the DVFs to the phase images or to the reference image to produce multiple inter-phase images between the neighboring original phase images. A 4D voxel phantom is a combination of high-temporal-resolution voxel phantoms and on-the-fly dose registration to the reference phase image. In the course of particle transport simulation, the dose or deposited energy is directly registered to the reference phase image on-the-fly (i.e., after each event) using a DVF for dose registration. In the present study, we investigated two methods-DRP (DIR [deformable image registration] with respect to Reference Phase image) and DNP (DIR with respect to Neighboring original Phase image) - for production of multiple inter-phase images or high-temporal-resolution voxel phantoms. Utilizing these two methods, two 4D voxel phantoms each with 100 phases were produced from the original 10-phase images of the 4D CT data of a real patient in order to compare the two methods and to test the feasibility of the 4D voxel phantom methodology in general. We found that it is possible to produce a 4D voxel phantom very rapidly (i.e., <40 min on a 4-core personal computer for a 100-phase phantom) in a fully automated process. The dose calculation results showed that the constructed 100-phase 4D voxel phantoms provide cumulative-dose distributions very similar to those of the conventional 10-phase approach for stationary proton-beam irradiation. The passing rates of the dose distributions of the 4D voxel phantoms were higher than 99.9% according to the 3% and 3 mm gamma criteria, which results validate the 4D voxel phantom methodology. The point- and dose-tracking analysis data showed that the DRP method, which uses the minimal number of DIR operations but uses inverse DVFs, provides significantly better results than those of the DNP method, which uses only DIR to generate the DVFs for inter-phase image generation and dose registration. The present study also showed that the computation time does not significantly increase when the number of phases in the 4D voxel phantom is increased for more realistic representation of continuous respiratory motion; the only significant increase is in the memory occupancy, which grows almost linearly with the number of phases.</P>
정재승(Jason Chung),한상훈(Sang-Hun Han) 한국무역연구원 2016 무역연구 Vol.12 No.3
A bonded area is a place designated or licensed by the head of a customs office because of the necessity of efficient cargo management and customs administration. Self-managed bonded area system entrusts the management of goods to the operator or cargo manager so that he or she may manage goods autonomously. This self-managed bonded area must by all means employ a bonded goods caretaker as a professional cargo manager in charge of managing goods stored in the bonded area. A bonded goods caretaker performs such duties as monitoring and confirming bonded cargos and domestic goods shipped into or out of a bonded area. However, a bonded goods caretaker system has positive and negative aspects. In order to develop a bonded goods caretaker system, it is important to enhance the understanding of the system. However, academic research on bonded goods caretaker system is almost non-existent. Therefore, this paper examines the concept of a bonded goods caretaker system and analyzes its current status. The purpose of this paper is to contribute to enhance the understanding of bonded goods caretaker system and to strengthen bonded goods caretaker’s independence by identifying the problems and deriving the development plans.
Pixel-wise distortion model and its calibration method for AMCW LiDAR
Junwoo Jason Son,Youngbin Son,Byeongho Song,Soohee Han 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
In this conference paper, we proposed pixel-wise distortion model and its calibration method for AMCW (Amplitude Modulated Continuous Wave) LiDAR (Light Detection and Ranging). The proposed model can be reflect square wave distortion, common mode error and non-linear characteristic of the receiving circuit. The model characterise the distance error with actual distance and amplitude of the DCS (Differential Correlation Sample). A simple calibration method is also announced in order to use the proposed model. The method uses modulation signal delay and shutter speed variation to measure the response of the receiving circuit. The experiment was carried out with various signal delay and shutter speed under simple calibration box. The result shows the response of the AMCW LiDAR was changed by both inputs and also the AMCW LiDAR can measure the distance without these errors by using the proposed model and calibration method.
한승진(Seungjin Han),김재성(Jason Kim) 한국정보보호학회 2012 情報保護學會誌 Vol.22 No.4
바이오 인식, 즉 지문, 목소리, 얼굴, 눈동자, 침, 땀 등 인간이 가진 바이오 인식 정보를 기반으로 한 IT는 많은 응용이 가능하다. IT 전문가들은 모바일을 활용한 바이오 인식 비즈니스야말로 21세기의 새로운 광맥이 된다고 믿고 있다. 바이오인식 기술은 가트너 그룹 및 미국 MIT 대학의 ‘21세기 유망 20대 기술’ 중 하나로 선정되기도 하였으며 타 IT 산업에 비해 10~20% 이상의 높은 성장률을 보일 것으로 예상하고 있다. 본 논문에서는 이와 같은 바이오 인식 기술을 모바일장치에 적용한 최신 사례들을 분석하고 동향을 소개한다.
Numerical simulation of laser ablation driven melt waves
Pocorni, Jetro,Han, Sang-Woo,Cheon, Jason,Na, Suck-Joo,Kaplan, Alexander F.H.,Bang, Hee-Seon Elsevier 2017 Journal of manufacturing processes Vol.30 No.-
<P><B>Abstract</B></P> <P>Numerical simulations on the melt flow down the keyhole front during fibre laser welding are presented here. The calculations confirm the existence of melt waves previously observed by high speed imaging, with velocities ranging between 4 and 10m/s. The simulations provide spatial and temporal information on the temperature and flow fields, particularly within the melt film volume, which cannot be observed by high speed imaging. The ablation pressure achieves high values around wave-peaks and at the bottom of the front, just before droplets are sheared off. The simulation results provide explanations on the main liquid transport mechanisms within the keyhole based on information on the temperature, velocity and pressure field and on the geometrical front conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Laser ablation driven melt waves are, for the first time, theoretically analyzed. </LI> <LI> The simulations provide detailed information, complementary to high speed imaging. </LI> <LI> Boiling peaks generate V-shaped waves that propagate downwards. </LI> <LI> A theoretical description of the waves was derived from the findings. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>