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.

X-ray 단층촬영기법을 이용한 스트랜드보드의 내부공극구조에 관한 연구

오세창 ( Sei Chang Oh ) 한국목재공학회 2008 목재공학 Vol.36 No.6

택시關聯 틈새手段의 導入方案에 關한 硏究

吳世昌(Oh Sei-Chang),李載吉(Lee Jae-Gil) 대한국토·도시계획학회 1999 國土計劃 Vol.34 No.5

경골목구조에서 구조재와 오에스비로 구성된 못 접합부의 인발 및 전단성능

오세창 ( Sei Chang Oh ) 한국목재공학회 2013 목재공학 Vol.41 No.3

경골목조건축에서 못 접합부는 수평하중을 지지하고 전달하도록 설계되지만, 바람으로 인한 상향력처럼 인발하중에 직면하기도 한다. 본 연구에서는 경골목조건축에서 일반적으로 사용되는 구조재와 덮개로 구성된 못 접합부에 대하여 인발성능과 2면 전단시험을 통해 인발 및 측방하중에 대한 내력성능을 시험하고 설계기준에 부합되는 가를 평가하였다. 인발하중에 대한 내력성능은 부재의 비중에 의해 크게 좌우되었으며 I형장선의 경우 낮은 밀도에도 불구하고 높은 인발성능을 나타내었다. 최대 인발하중은 기준허용 최대 인발하중보다 매우 높게 나타났다. 전단성능도 비중이 큰 낙엽송과 오에스비로 구성된 접합부가 비중이 작은 SPF와 오에스비로 구성된 접합부보다 높은 성능을 나타내었으며 모두 기준설계치보다 높은 성능을 나타내었다. 접합부의 변형은 주로 못의 휨 변형에 의한 것으로 나타났으며 SPF와 오에스비로 구성된 접합부에서의 못의 휨 변형이 현저하게 나타났다. The nailed joints in wood construction are commonly designed to resist and carry the lateral load but also subject to withdrawal force like uplift load due to the wind. This research was conducted to evaluate the performance of nailed joint composed of dimension lumber and sheathing materials through the nail withdrawal and unsymmetric double shear joint test, and then compared to curreut design values. The withdrawal strength was greatly dependant on wood specific gravity, and the withdrawal strength of I-joist with OSB showed higher value in spite of low specific gravity. The maximum withdrawal loads were greater than that of derived current design values about 5 times. The lateral resistance of Japanese larch/OSB nailed joints was higher than that of SPF/OSB nailed joint, and derived allowable lateral strength of nailed joints in this study exceeded the current design values. The failure mode of nailed joints was primarily due to the nail bending and this tendency was notable in SPF/OSB nailed joint.

초음파 비파괴 시험법을 이용한 탄성계수의 산정을 통한 침엽수 구조용재의 이방성에 관한 기초연구

오세창 ( Sei-chang Oh ) 한국목재공학회 2017 목재공학 Vol.45 No.1

본 연구의 목적은 목재의 세 주요 축 방향에 대하여 각 방향별 탄성계수를 비파괴적으로 측정하여 이에 따른 목재의 이방성을 검토해 보고자 하였다. 결점이 없는 SPF (spruce-pine-fir)와 Hem-fir 및 낙엽송재에 대하여 무결점 시험편을 채취하고 각 시험편에 대해 세 방향에서 초음파 속도를 측정한 다음, 이 속도와 각 재료의 밀도를 이용하여 산정된 탄성계수를 비교하였다. 시험 결과 초음파속도 및 탄성계수는 방향별로 목재의 길이방향, 방사방향, 접선방향의 순으로 나타났으며, 밀도가 높을수록 각 방향별 탄성계수가 더 높게 나타났다. 수종 간에 있어서 길이방향의 탄성계수의 차이보다 방사방향, 접선방향의 차이가 더 크게 나타났다. 산정된 탄성계수를 사용하여 재료의 이방성을 비교하여 제시하였으며, 이를 통해 강성매트릭스의 대각선 항을 산정하였다. The aim of this paper is to present the modulus of elasticity of E_L, E_R, E_T 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.

단판적층재(LVL)의 전단강도 시험방법에 관한 비교연구

오세창(Oh, Sei-Chang) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.12

Representative shear strength test methods to evaluate the shear strength of laminated veneer lumber(LVL) circulated in domestic lumber market were compared each other. ASTM shear block test and JAS and ISO short-span center point bending test were conducted to the LVL with the thickness of 25 ㎜ and 30 ㎜. In the case of ASTM shear block test and ISO/JAS short span bending test, the ultimate load were not significantly different. The ratio of short span bending test to shear blocktest were 1.10 in 25 ㎜ LVL and 0.74 in 30 ㎜ LVL. The linear regression analyses between shear block test and short span bending test were conducted and weak relationship were found. Furthermore, the linear regression analyses between shear strength from each methods and bending strength or MOE were observed to be no significant relationship. The short-span center point bending test showed shear failure rather than bending failure and the glueline failure between lamination was not found. The short span center point bending test was considered to be effective test method to evaluate the shear strength of laminated veneer lumber. Further works on the optimal test methods are required to evaluate the precise shear strength of structural composite lumber in actual size.

두부비지를 이용한 합판용 접착제의 개발 및 적용

오세창 ( Sei Chang Oh ),안세희 ( Sye Hee Ahn ),최인규 ( In Gyu Choi ),정한섭 ( Han Seob Jeong ),윤영호 ( Young Ho Yoon ),양인 ( In Yang ) 한국목재공학회 2008 목재공학 Vol.36 No.3

信用狀 當事者의 責任과 義務에 관한 硏究

吳世昌(Sei-Chang Oh) 계명대학교 산학연구소 1977 經營經濟 Vol.8 No.1

목재 데크재의 초음파 비파괴시험에 의한 인위적인 결함의 영향평가

오세창 ( Sei Chang Oh ) 한국목재공학회 2016 목재공학 Vol.44 No.1

목재 데크재에 인위적인 결함인 구멍을 부여하고 이들의 성능평가를 위해 초음파 비파괴 시험법을 적용하였다. 구멍의 크기와 개수를 달리하여 각각에 대한 초음파 전달속도를 측정하고 탄성계수를 산정하여 그 영향을 비교분석하였다. 시험결과 구멍의 크기가 커짐에 따라 초음파 전달속도와 탄성계수는 감소하였으며 이들 상호간에는 직선상관관계를 보였다. 구멍의 크기가 증가하면 초음파의 전달 길이는 증가하며 이에 따라 초음파속도는 감소하였지만 구멍의 크기가 15 mm 이하로 작은 경우에는 구멍이 없는 부재에 비해 그 차이가 작게 나타났다. 구멍의 개수가 많아짐에 따라 초음파 전달속도와 탄성계수는 감소하였으며 이들 상호간에는 높은 직선상관관계를 보였다. 구멍의 개수가 3개인 경우 초음파속도는 약 3.5% 정도 감소한데 비하여 탄성계수는 27% 정도로 현저히 감소하여 더 큰 감소경향을 나타내었다. 이들의 결과로부터 구멍의 크기와 개수는 초음파 전달속도와 탄성계수에 영향을 미치며 구멍의 크기가 크고 개수가 많아질수록 그 영향은 더욱 커질 것으로 여겨진다. 또한 작은 결함의 탐지를 위해서는 초음파 전달속도에만 의지할것이 아니라 여러 초음파 변수를 고려하여 적용하는 방법을 고려하여야 할 것으로 생각된다. 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.

巴里長書와 宋浚弼

吳世昌(Oh, Sei-chang) 한국근현대사학회 2000 한국 근현대사 연구 Vol.15 No.-