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가치기반 및 잠재프로파일을 통한 로보택시 사용자 수용성 평가
김인수(KIM, Insu),오세창(OH, Sei-Chang),김정화(KIM, Junghwa),양충헌(YANG, Choongheon) 대한교통학회 2023 대한교통학회지 Vol.41 No.6
Recently, as innovative technologies such as information and communication technology, artificial intelligence, and big data have been converged and combined in the transportation field, fierce competition is underway to preoccupy the future mobility market, including autonomous vehicles. As a derived service case in the autonomous vehicle field, there is an electric vehicle-based Robo Taxi, which has the potential to lead to the spread of autonomous vehicles and various social changes. Therefore, an important prerequisite for successful activation along with commercialization of Robo Taxi is that it should be based on user acceptability. A Technology Acceptance Model has been introduced to analyze the acceptability of people using advanced technologies such as autonomous vehicles, and recently, a Value-based Adoption Model has been applied that considers benefits and sacrifices overall. The purpose of this study was to provide theoretical and practical guidelines to help spread and spread Robo Taxi by analyzing factors that affect users intention to accept Robo Taxi through Value-based Adoption Model as well as through Latent Profile Analysis to find out what characteristics and effects each combination of factors show and affects within the Robo Taxi adoption group. First, the factors influencing user acceptance of Value-based Adoption Model considering Robo Taxi benefits and sacrifice factors were analyzed. Perceived benefits, perceived sacrifice, vehicle-sharing services, taxis, self-driving cars, and preferences for private cars were selected as independent variables to confirm the impact on perceived value and adoption intention for Gyeonggi-do residents. In addition, Latent Profile Analysis was performed on Value-based Adoption Model variables related to Robo Taxi acceptance, and individual item response patterns and similar response characteristics were grouped into the same group or group and analyzed in detail. In the context of a lack of acceptance research on autonomous driving-based Robo Taxi, this study used Value-based Adoption Model and Latent Profile Analysis to analyze factors for enhancing Robo Taxi acceptance and draw relevant implications. Therefore, it is significant as a meaningful basic study for expanding the acceptability of Robo Taxi, and based on this, it is expected to be of great help in activating Robo Taxi services.
吳世昌(Oh Sei-Chang),李載吉(Lee Jae-Gil) 대한국토·도시계획학회 1999 國土計劃 Vol.34 No.5
There exist various type of transportation modes such as passenger car, rental car, local bus, shuttle bus related to taxies. It is analyzed that there is a big niche market between taxi and those transportation modes. For the long run, there is a necessity of introducing various niche transportation modes. For the short run, it is desirable to decide the priority transportation mode among niche modes and the test site and to extend the application after testing. This study focuses on the introduction of van-taxi to satisfy the niche demand between taxies and adjacent transportation modes such. as passenger car, local bus, rental car. This study analyzes the niche market related to taxi and proposes necessity and direction of the introduction of van-taxi.
초음파 비파괴 시험법을 이용한 탄성계수의 산정을 통한 침엽수 구조용재의 이방성에 관한 기초연구
오세창 ( Sei-chang Oh ) 한국목재공학회 2017 목재공학 Vol.45 No.1
The aim of this paper is to present the modulus of elasticity of E<sub>L</sub>, E<sub>R</sub>, E<sub>T</sub> along three principal axis of softwood dimension lumber by nondestructive method. Ultrasonic measurement was carried out on defect free wood samples taken by the Japanese Larch, SPF (spruce-pine-fir) and Hem-fir 2 × 4 s. The ultrasound velocities were measured to calculate young`s moduli and it was derived elastic constants for each wood samples using the ultrasound velocities and densities of wood. From the test, E<sub>L</sub> was much greater than E<sub>R</sub> and E<sub>T</sub>. E<sub>R</sub>/E<sub>T</sub> ratios were about 1.3. The high density wood had high young`s moduli in three principal axis and the difference in young`s moduli between species was greater in transverse direction than longitudinal direction. The anisotropy of the lumber was presented through the calculated elastic moduli and compliances matrix in diagonal term were determined by inverting the stiffness matrix.
오세창 ( Sei Chang Oh ) 한국목재공학회 2015 목재공학 Vol.43 No.4
The ultrasonic nondestructive test (NDT) was applied to deck in-service to inspect and evaluate the performance of decking materials using ultrasonic pulse velocity. First, the measuring method between direct and indirect method according to transducer arrangement was studied. Second, the ultrasonic pulse velocity of decks in-service was compared with the passage of time. Finally, the change of ultrasonic pulse velocity was evaluated to expect service life of decking materials. The results of comparison between direct and indirect method was statistically insignificant and the ratio of direct to indirect method was 1.02. 1.05 respectively. The ultrasonic pulse velocity of decks in-service was decreased as the passage of time and the linear relationship in the ultrasonic pulse velocity to passage of time was found. From the results, The ultrasonic NDT will be helpful as an efficient method of on-site management of decks in-service.
목재 데크재의 초음파 비파괴시험에 의한 인위적인 결함의 영향평가
오세창 ( Sei Chang Oh ) 한국목재공학회 2016 목재공학 Vol.44 No.1
Non-destructive ultrasonic testing was applied to evaluate the performance of wood deck material with hole as artificial defect. Ultrasonic velocities and modulus of elasticity were measured according to different diameters and numbers of holes, and comparative analysis to each data were done. From the results, ultrasonic velocities and modulus of elasticity decreased with an increase in the hole size and showed a negative linear correlation with the size of hole, respectively. As the hole size increased, ultrasonic velocities decreased, but their difference was small in the case of the hole size under 15 mm. Also, ultrasonic velocities and modulus of elasticity decreased with increasing the number of holes and showed a strong negative linear correlation to the number of holes. As the number of holes increased, ultrasonic velocities decreased to 3.5%, but modulus of elasticity decreased to 27%. Therefore, the number of holes showed greater influence to modulus of elasticity than ultrasonic velocity. Overall, the size and number of holes influenced to ultrasonic velocity and modulus of elasticity, and their influence will be greater as the size and number of holes increases. These results suggested that several ultrasonic parameters rather than a single ultrasonic velocity should be applied to detect small defects in wood decking materials.