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Technology Acceptance Modeling based on User Experience for Autonomous Vehicles
Yujun Cho,Jaekyu Park,Sungjun Park,Eui S. Jung 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.2
Objective: The purpose of this study was to precede the acceptance study based on automation steps and user experience that was lacked in the past study on the core technology of autonomous vehicle, ADAS. The first objective was to construct the acceptance model of ADAS technology that is the core technology, and draw factors that affect behavioral intention through user experience-based evaluation by applying driving simulator. The second one was to see the change of factors on automation step of autonomous vehicle through the UX/UA score. Background: The number of vehicles with the introduction of ADAS is increasing, and it caused change of interaction between vehicle and driver as automation is being developed on the particular drive factor. For this reason, it is becoming important to study the technology acceptance on how driver can actively accept giving up some parts of automated drive operation and handing over the authority to vehicle. Method: We organized the study model and items through literature investigation and the scenario according to the 4 stages of automation of autonomous vehicle, and preceded acceptance assessment using driving simulator. Total 68 men and woman were participated in this experiment. Results: We drew results of Performance Expectancy (PE), Social Influence (SI), Perceived Safety (PS), Anxiety (AX), Trust (T) and Affective Satisfaction (AS) as the factors that affect Behavioral Intention (BI). Also the drawn factors shows that UX/UA score has a significant difference statistically according to the automation steps of autonomous vehicle, and UX/UA tends to move up until the stage 2 of automation, and at stage 3 it goes down to the lowest level, and it increases a little or stays steady at stage 4. Conclusion and Application: First, we presented the acceptance model of ADAS that is the core technology of autonomous vehicle, and it could be the basis of the future acceptance study of the ADAS technology as it verifies through user experience-based assessment using driving simulator. Second, it could be helpful to the appropriate ADAS development in the future as drawing the change of factors and predicting the acceptance level according to the automation stages of autonomous vehicle through UX/UA score, and it could also grasp and avoid the problem that affect the acceptance level. It is possible to use these study results as tools to test validity of function before ADAS offering company launches the products. Also it will help to prevent the problems that could be caused when applying the autonomous vehicle technology, and to establish technology that is easily acceptable for drivers, so it will improve safety and convenience of drivers.
Toroidal-Shaped Coils for a Wireless Power Transfer System for an Unmanned Aerial Vehicle
Jaehyoung Park,Jonghoon Kim,Yujun Shin,Bumjin Park,Won-Seok Kim,Seok-Jong Cheong,Seungyoung Ahn 한국전자파학회JEES 2019 Journal of Electromagnetic Engineering and Science Vol.19 No.1
Unmanned aerial vehicles (UAVs) using communications, sensors, and navigation equipment will play a key role in future warfare. Currently, UAVs are monitored to prevent misfire and accidents, and the conventional method adopted uses wires for data transmission and power supply. The repeated connection and disconnection of cables increases maintenance time and harms the connector. For convenience and stability, a wireless power transfer system to power UAVs is needed. Unlike other wireless power transfer (WPT) applications, the size of the receiving coils must be small, so that the WPT systems can be embedded inside space-limited UAVs. The small size reduces the coupling coefficient and transfer efficiency between the transmitting and the receiving coils. In this study, we propose a toroidal-shaped coil for a WPT system for UAVs with high coupling coefficient with minimum space requirements. For validation, conventional coils and the proposed toroidal-shaped coil were used and their coupling coefficient and power transfer efficiency were compared using simulated and measured results. The simulated and measured results were strongly correlated, confirming that the proposed WPT system significantly improved efficiency with negligible change in the space requirement.
손실 저감을 위해 분할된 도체를 가지는 인쇄 회로 기판형 무선충전 코일
신유준(Yujun Shin),박재형(Jaehyoung Park),김종훈(Jonghoon Kim),권병기(Byunggi Kwon),은희현(Heehyun Eun),최석민(Seokmin Choi),안승영(Seungyoung Ahn) 한국전자파학회 2019 한국전자파학회논문지 Vol.30 No.9
본 논문에서는 무선전력전송 시스템 코일의 저항성분에 의해 발생하는 전력손실을 저감하기 위하여 분할된 도체를 갖는 PCB형 코일구조를 제안하였다. 제안된 구조는 유한요소법 자기장 시뮬레이션을 이용하여 설계하였으며, 실제 제작된 코일의 측정을 통해 저감된 저항 값을 가진다는 것을 증명하였다. 또한, 무선전력전송 실험 수행을 통해, 같은 전력을 전송시켰을 때 기존의 구조보다 제안된 구조에서 코일에서 소모되는 전력이 감소한다는 것을 확인하였으며, 열 발생 또한 감소하는 것을 확인하였다. 이를 통해 무선전력전송 시스템의 효율이 증가하는 것을 확인하였다. In this paper, a printed circuit board(PCB)-type coil structure with split conductors is proposed to reduce the power loss caused by coil resistance. Simulated magnetic field measurement reveals that the proposed coil has reduced resistance. In addition, wireless power transfer experiments reveal that when the same power is transferred, the power consumption in the coil with the proposed structure is reduced compared with that having a conventional structure. Moreover, heat generation is also reduced in the coil with the proposed structure. Therefore, the new coil is confirmed to increase the efficiency of wireless power transfer system.
무선 이동체의 비접촉 배꼽장치를 위한 무선전력전송 기술의 응용
신유준(Yujun Shin),박재형(Jaehyoung Park),김종훈(Jonghoon Kim),권병기(Byunggi Kwon),은희현(Heehyun Eun),안승영(Seungyoung Ahn) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.9
미래의 전장에서는 무인 이동체의 역할이 매우 중요할 것으로 예측된다. 최근 사용되는 무인 이동체는 충전과 관리를 위하여 유선의 충전선과 데이터 연결선을 가지고 있다. 하지만 편리성과 안정성을 위하여 무인 이동체의 무선 충전과 무선 데이터 전송을 이용한 무선 전력전달 시스템을 사용하는 것이 요구되어지고 있다. 이 논문에서, 우리는 이러한 요구를 만족시키기 위하여 무인 이동체에 적용 가능한 무선 충전 기술을 연구하였다. 자기장 유한 요소 시뮬레이션을 통해 무인 이동체의 크기와 무인 이동체에서 사용하는 전력을 고려한 송, 수신 코일의 설계를 하였다. 또한, 시뮬레이션 결과를 바탕으로 최적의 코일을 제작하였고, 실험을 통하여 시뮬레이션 결과와 비교하여 검증하였다. In the future battlefield, the role of the unmanned vehicle is very important. Currently, charging and management systems for unmanned vehicles are all wired. However, for convenience and stability, it is desirable that the charging of the unmanned vehicle uses wireless power transfer system. In this paper, we have studied the application of wireless power transfer system to the charging of unmanned vehicles. Considering the size of the unmanned vehicle and the required power, the transmission coil and the receiving coil are designed through the finite element analysis based magnetic field simulation. The coil was made according to the simulation results and the circuit simulation was performed through the measured parameter values. Finally, we show that wireless power transmission can be applied to unmanned mobile charging through actual experiments.
Precise Vehicle Location Detection Method Using a Wireless Power Transfer (WPT) System
Shin, Yujun,Hwang, Karam,Park, Jaehyoung,Kim, Dongwook,Ahn, Seungyoung IEEE 2019 IEEE Transactions on Vehicular Technology VT Vol.68 No.2
<P>The paper proposes a method for locating an electric means of transportation such as electric vehicles that adopts dynamic wireless charging system. The method works with magnetic wireless power transfer systems, based on a ferrite core counting approach. The ferrite core counter system operates by counting all the ferrite cores of the source coils used for guiding the magnetic field in a magnetic wireless power transfer system. The proposed ferrite core counter has a position detection accuracy equivalent to the spacing of the ferrite cores. In addition, this paper proposes a ferrite position identification (FPID) messaging unit to correct ferrite core counter errors. FPID blocks which are successively placed under the source coil are recognized by the ferrite core counter, and their passage is reported as a sort of message in the vehicle. This FPID messaging unit provides the ferrite core counter with a system that can correct errors in the number of ferrite cores counted. The effectiveness of the vehicle positioning system with the ferrite core counter and the FPID messaging unit has been demonstrated through simulation and experiments.</P>
환경 및 경제성을 고려한 수열에너지 설계 프로그램 개발
안문기(Munki An),정유준(Yujun Jung),이호성(Hoseong Lee),박창용(Chang Yong Park),남유진(Yujin Nam),윤린(Rin Yun) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
하천수가 신재생에너지로 포함되면서 수열에너지를 이용하여 건물의 냉난방에 적용하는 방식이 점차 산업계에 확산되는 과정에 있다. 수열에너지를 건물에 적용하기 위해서는 하천에 미치는 환경적인 영향과 기존 건물 냉난방 설비에 비교하여 경제적인 효과가 고려되어야 할 것이다. 그러나, 국내외를 통틀어 아직까지 수열원의 수온변화와 같은 환경영향을 포함하여 수열 시스템 전 공정을 고려하여 수열적용 타당성을 판단할 수 있는 설계 프로그램 개발은 초보적인 단계라고 할 수 있다. 이에 본 연구에서는 전공정 수열원 히트펌프 시스템 프로그램 개발, 수열에너지 취득원인 하천수의 환경영향 평가 프로그램 개발, 수열 시스템 에너지 소비예측 LCC(lifecycle cost) 프로그램 개발, LCCP(life cycle climate performance) 등 수열시스템 환경 영향 프로그램의 개발로 구성되고 최종 사용자가 수월하게 접근할 수 있는 형태로 통합 플랫폼을 구축하고자 한다. 이를 통해 다양한 수열원을 통한 건물의 에너지 저감뿐만 아니라 경제성 평가(LCC), 전주기 환경영향평가(LCCP)를 탑재한 설계 프로그램은 수열 산업 확대와 보급화에 기여할 것으로 판단된다.