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초음파 센서를 이용한 차량 주차공간 탐색에서의 연석 감지 알고리즘
김수용(Suyong Kim),이동욱(Dongwook Lee),박성훈(Sunghoon Park),권재희(Jaehee Kwon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently many automobile companies are developing parking assist system as it improves the convenience of drivers. Among several types of parking assistance system, the method using ultrasonic sensors for detecting parking space is widely used because of its low cost and usefulness. In order to detect the parking space, the parking space detection algorithm provides the width and the length of the parking space using long range ultrasonic sensor. In this paper, to detect the accurate parking space with the curbstone, the curbstone detection algorithm is proposed. The performances of the proposed algorithm are verified and evaluated by experiments.
전재한(Jaehan Jeon),최아라(Ara Choi),박성훈(Sunghoon Park),정태영(Taeyoung Chung) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
As an autonomous driving technology is the future of on-road driving, an unmanned valet parking system is one of a key technology to realize door to door autonomous vehicle. When an autonomous vehicle arrive its destination, the driver steps out of the car and pushes button on the smart phone, and then the vehicle autonomously parking in without any anxiety of user. Similarly, the vehicle gets out from the parking lot at right time and right position for user. We mainly focused on a vehicle actuator control, path following control for parking slot detection, parking maneuver control with shift-by-wire system, and smart phone interface between the user and vehicle. As the localization technology of a vehicle at the indoor or outdoor parking areas is most important and difficult problem, we applied precise position information from the DGPS for preliminary implementation of the system.
Pd 나노입자가 코팅된 β-Bi₂O₃ 나노와이어의 NO₂ 검출 특성
박성훈(Sunghoon Park),강우승(Wooseung Kang) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.6
Pd-functionalized β-Bi₂O₃ nanowires are synthesized by thermal evaporation of Bi powder using VLS mechanism followed by Pd coating and annealing. In this study, sensing properties of Pd-functionalized β-Bi₂O₃ nanowires sensor to selected concentrations of NO₂ gas were examined. Scanning electron microscopy showed that the nanowires with diameters in a range of 100 - 200 nm and lengths of up to a few tens of micrometers. Transmission electron microscopy and X-ray diffraction confirmed that the products corresponded to the nanowires of β-Bi₂O₃ crystals and Pd nanoparticles. Pd-functionalized β-Bi₂O₃ nanowires sensor showed an enhanced sensing performance to NO₂ gas compared to as-synthesized β-Bi₂O₃ nanowires sensor. As synthesized and Pd-functionalized β-Bi₂O₃ nanowire sensors showed responses of 178% - 338% and 196% - 535% at 300℃, respectively, to 0.05 - 2 ppm NO₂. In addition, the underlying mechanism of the enhancement of the sensing properties of β-Bi₂O₃ nanowires by Pd-functionalization is discussed.
TiO₂ 나노입자가 코팅된 다중 벽 탄소 나노튜브의 상온에서의 수소 가스 검출 특성
박성훈(Sunghoon Park),강우승(Wooseung Kang) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.6
Multiwall carbon nanotubes are synthesized by using VLS mechanism for the application to H₂ gas sensor. MWCNT is not suitable for hydrogen gas sensor due to its low response to the gas. To enhance the gas sensing performance, multiwall carbon nanotubes are coated with TiO₂ nanoparticles. Scanning electron microscopy and Transmission electron microscopy showed that the synthesized MWCNT were well dispersed with the diameter and wall thickness of approximately 10-30nm and 5nm, respectively. The MWCNT sensor showed the sensitivities of 1.33–9.5% for the H₂ concentration of 100–5000ppm at room temperature. These sensitivities are significantly improved to 6.64–46.65% by coating TiO₂ nanoparticles to the MWCNT sensor. The mechanisms of H2 gas sensing improvement of the MWCNT sensor coated with TiO₂ nanoparticles are discussed.
Co₃O₄ 나노입자가 코팅된 In₂O₃ 나노와이어의 에탄올 가스 검출 특성
박성훈(Sunghoon Park),강우승(Wooseung Kang) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.1
In₂O₃ nanowires were coated with Co₃O₄ nanoparticles to investigate the improvement of ethanol gas sensing performance compared with as-synthesized In₂O₃ nanowires. Scanning electron microscopy showed that the nanowires synthesized by VLS mechanism had diameters and lengths of approximately 50-100 nm and a few micrometers, respectively. Co₃O₄ nanoparticles produced by hydrothermal method was in the size range of a few to a few tens nm. As-synthesized and Co₃O₄ nanoparticles coated In₂O₃ nanowires sensors exhibited responses of 1.96% and 4.57%, respectively for the ethanol gas concentration of 200 ppm at 200°C. The underlying mechanism for the improved responses of Co₃O₄ nanoparticles coated In₂O₃ nanowires sensors is discussed.
회전 전착 도장 시 후드 부 주변 유동 특성에 대한 수치해석 연구
박성훈(Sunghoon Park),최종락(Jongrak Choi),허남건(Nahmkeon Hur),오창석(Chang Seok Oh) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Putting a coat of paint on an automobile has a number of advantages of protecting it from being corroded, bringing out its appearance, etc. Accordingly, companies are trying to develop the skills of painting process. The painting process of an automobile has the typical processes of spraying and dipping. These processes may have merits and demerits, but the dipping process dealt with in this study has a good painting efficiency compared to spraying and have a demerit of deforming the outer frame of an automobile. This research has the aim of predicting the spots and amount of deformation by analyzing the pressure on the outer frame of an automobile in the Ro-Dip process. To achieve the aim, we put the domain of an automobile into the cylinder and rotated it. In this process we sued the VOF method and treated the cylinder with interfaces and sliding mesh. Consequently, we checked that high pressure went on the hood, predicting the spot of deformation by means of finding pressure gaps between the upper surface and the lower surface of hood. Through this, the study can provide the guideline that can reduce the damage to car that occurs during the dipping process and optimize the process.
도로결빙방지를 위한 발열 나노 시멘트 복합재의 전원 공급 효율에 대한 실험적 연구
박성훈(Park Sunghoon),이희영(Lee Heeyoung),정원석(Chung Wonseok) 한국방재학회 2018 한국방재학회논문집 Vol.18 No.6
다중벽 탄소나노튜브(Multi-Walled Carbon Nanotube, MWCNT)는 전기적, 열적 성능이 우수한 재료이다. 본 연구에서는 MWCNT 를 혼입한 시멘트 복합체의 효율적인 전압 공급 방법을 연구하여 도로결빙 방지를 위한 발열가능 건설재료의 기초연구를 수행하였다. 전압 공급방법은 7일 재령의 MWCNT 시멘트 복합체에 동일한 전압과 상이한 전극 위치를 고려하여 발열 특성을 분석하였다. Case 1은 100V의 전압을 3개의 전극에 공급하였고, case 2는 150 V의 전압을 2개의 전극에 공급하고 온도센서 및 열화상 카메라를 이용하여 온도 전달 및 분포를 분석하였다. 실험결과, case 1이 case 2에 비해 최대 온도변화량은 작았지만 시편 전체의 발열성능 확보에는 유리한 것으로 분석되었다. Multi-walled carbon nanotubes (MWCNTs) show excellent electrical and thermal performances. A method for efficiently supplying voltage to an MWCNT cement composite was investigated through a heating test. In this study, parameters were set by applying a total voltage of 300 V to the MWCNT cement composite cured for 7 days. In Case 1, a voltage of 100 V was supplied from three voltage supply electrodes. In Case 2, a voltage of 150 V was supplied from two electrodes. It was observed from the test results that the maximum temperature change of Case 1 is lower than that of Case 2. However, the surface temperature of Case 1 is higher than that of Case 2 as observed through a thermal camera.
NiO의 첨가에 따른 α-Fe₂O₃ 나노입자 센서의 에탄올 가스 검출 특성 향상
박성훈(Sunghoon Park),강우승(Wooseung Kang) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.1
In order to investigate the effect of NiO on the ethanol gas sensing performance of α-Fe₂O₃ nanoparticles, NiO and α-Fe₂O₃ nanoparticles are synthesized by hydrothermal method. The sensor with α-Fe₂O₃ and NiO nanoparticles mixed at an optimum ratio of 7:3 showed 3.8 times improved sensing performance for 200ppm ethanol gas at 200°C. The enhanced gas sensing performance can be considered to be caused by pn heterojunction at the grain boundaries of α-Fe₂O₃ and NiO nanopartcles.
전처리-전착 도장 공정 중 발생하는 자동차 후드의 변형 방지를 위한 수치해석적 연구
박성훈(Sunghoon Park),허남건(Nahmkeon Hur),김낙수(Naksoo Kim),오창석(Chang Seok Oh) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Coat of painting on an automobile has many merits such as protecting it from corrosion and set off the appearance. In such an automobile painting process include spraying and electro-deposition process. Of these, electro-deposition process has a good performance compared to spraying process. But, during the process, automobile frame is deformed by fluid pressure such as paint and air. This study has an aim of analyze the position of deformation by numerical analyzing the pressure on the hood of an automobile during the electro-deposition process. To achieve the purpose, the two-phase interfacial flow in the painting tank was using the VOF method and used the ASI(arbitrary sliding interface) for automobile moving. The simulation results showed the pressure distribution on the hood of an automobile frame. The relationship between active pressure and deformation position of the hood was obtained from the numerical analysis results. Also, effects of automobile UPH were considered by CFD simulation. Through this, the present results can provide the guideline for optimization that reduce the pressure on the automobile during the dipping process.