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A Vehicle Motion Predictor for Autonomous Racing
Sanghoon Oh(오상훈),Eunhyek Joa(좌은혁),Kyongsu Yi(이경수) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
This paper presents a vehicle motion predictor for an autonomous racing system to assure safety when driving in limit handling situation. The proposed algorithm consists of two sequential parts; (1) Tire model identifier (2) Prediction of vehicle state. In the tire model identifier, parameters of a nonlinear tire model are identified through nonlinear optimization. In the prediction of vehicle sate, future vehicle states are calculated through numerical integration of a 2- DOF bicycle model that includes previously identified tire model. Moreover, assuming normal distribution of prediction error of each state, the probability of lateral instability and track escape of the future can be calculated. The proposed algorithm has been validated through computer simulations. The results show that the algorithm well predicts future vehicle states.
Settling and Filtering Processes for Treatment of Fine Suspended Solidsand Soluble Heavy Metals
Minah Oh(오민아),Wonki Kim(김원기),Seungjin Oh(오승진),Dukmin Kim(김덕민),SangHoon Lee(이상훈),Jai-Young Lee(이재영) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11
Fine suspended solids and heavy metals generated effluence from mine drainage could destroy environment as the aesthetic landscapes, and depreciate water quality. Therefore, the purpose of this research is focused on process development applied the actual field for controlling fine suspended solids and heavy metals, and so lab-scale test was performed for inducement of basic data. The mine drainage used in this research was sampled in H. mine located Jeongseon-gun, Gangwon-do. Concentration of suspended soil, arsenic, iron and manganese was exceeded the standard of contaminant limitation for the clean water, and particle size of suspended solid was less than 10 μm as fine particle. Although hydraulic retention time of mine drainage for effective settling was required more than 6 hours, hydraulic retention time would be increased in winter season when the settling efficiency could be reduced because of viscosity decreasing. Moreover, installed inclination plate helped to increase settling efficiency of suspended solid about 30 %. Filtering media that was the most effective removal of suspended solids and heavy metal was indicated granular activated carbon of 1~2 mm was the optimal size.
스틸 프레스 어퍼암 용접 구조에 따른 암 성능 영향도 비교
오상훈(Sanghoon Oh),박민수(Minsoo Park) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In the case of rear wheel suspension arms, the method of forming a high-strength steel panel and applying overlap welding is the most used. But looking at the recent trend of competitors, there are increasing cases of applying butt welding to the joint. In general, butt welding is known to be disadvantageous in terms of productivity compared to overlap welding. In order to understand the reason for applying butt welding, the rear wheel upper arm of the existing overlap welding structure was converted to a butt welding structure. After the design change, comparison was made in terms of the main performance of the arm and the assembly of the module. As a result of the study, when butt welding was applied to the steel press upper arm, it was confirmed that the axial stiffness, stress, and buckling force performance were superior under the same weight condition compared to the overlap welding structure. And it was found that there is also an advantage that the left and right suspension arms can be commonized.
상호작용하는 H₂-CO 예혼합 화염에서 H₂선호확산의 영향에 관한 수치적 연구
오상훈(Sanghoon Oh),박정(Jeong Park),권오붕(Ohboong Kwon) 한국연소학회 2012 한국연소학회지 Vol.17 No.3
The effects of strain rate and preferential diffusion of H2 on flame extinction are numerically studied in interacting premixed syngas-air flames with fuel compositions of 50% H₂ + 50% CO and 30% H₂ + 70% CO. Flame stability diagrams mapping lower and upper limit fuel concentrations at flame extinction as a function of strain rate are examined. Increasing strain rate reduces the boundaries of both flammable lean and rich fuel concentrations and produces a flammable island and subsequently even a point, implying that there exists a limit strain rate over which interacting flame cannot be sustained anymore. Even if effective Lewis numbers are slightly larger than unity on extinction boundaries, the shape of the lean extinction boundary is slanted even at low strain rate, i.e. ag = 30 s<SUP>-1</SUP> and is more slanted in further increase of strain rate, implying that flame interaction on lean extinction boundary is strong and thus hydrogen (as a deficient reactant) Lewis number much less than unity plays an important role of flame interaction. It is also shown that effects of preferential diffusion of H2 cause flame interaction to be stronger on lean extinction boundaries and weaker on rich extinction boundaries. Detailed analyses are made through the comparison between flame structures with and without the restriction of the diffusivities of H2 and H in symmetric and asymmetric fuel compositions. The reduction of flammable fuel compositions in increase of strain rate suggests that the mechanism of flame extinction is significant conductive heat loss from the stronger flame to ambience.
오상훈 ( Sanghoon Oh ),심재균 ( Jaekyun Shim ),이석한 ( Sukhan Lee ),안정호 ( Jung Ho Ahn ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
유무선 네트워크 기술의 급격한 발전 및 개인용 휴대 장치의 보급 증가와 그에 맞물린 소셜네트워크 서비스 등의 활성화로 인해 데이터의 전송량이 폭발적으로 늘어나고 있으며, 이러한 추세는 향후 지속 될 것으로 전망된다. 이에 데이터센터의 수요가 증가하고 있으며, 확장 및 유지보수가 쉬우면서도 높은 성능을 갖는 시스템에 대한 요구가 높아지고 있다. 본 논문에서는 데이터센터 네트워크의 구성요소를 분석하고 각각의 지연시간을 알아보았으며, 그 중 확장 및 유지보수가 쉬우나 상대적으로 지연시간 이 높은 이더넷을 데이터센터에 적용하였을 때 지연시간 개선을 위한 방법으로 Intel DPDK를 적용할 경우, 미적용시와 비교하여 약 86%의 지연시간 감소를 확인하였고, 추가 향상 방안을 조망하였다.
오상훈(Sanghoon Oh),이진호(Jinho Lee),손준형(Joonhyung Sohn) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
When Level 5 autonomous driving becomes possible, the future mobility market, such as PBVs that provide various forms and functions depending on the use and purpose, is expected to grow in earnest. The diversity of the PBV can be achieved by combining two large modular systems. One is the skateboard type drive module in the lower part of the vehicle related to driving, and the other is the life module in the upper part of the vehicle related to the passenger living space. It can be predicted that drive module for future mobility will require characteristics such as flexibility for size changes, low-floor structure to maximize passenger space, large steering angle for implementing various driving modes, and robust chassis frame structure for battery protection. In order to meet these required characteristics, the concept of the drive module was designed, a prototype was produced, and the road simulator durability evaluation was carried out, and the results met the evaluation criteria. Through this study, we have secured element technology related to the design and evaluation of skateboard type drive modules.