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서동우,허승욱,Seo, Dong-Woo,Heo, Seung-Wook 한국유기농업학회 2010 韓國有機農業學會誌 Vol.18 No.3
This study focused on analysis of the satisfaction level of specialty shops for environment-friendly agricultural products (EFAP). To analyze the satisfaction level of EF AP, a series of household surveys were conducted. Questionnaire was prepared on the basis of the SERVQUAL model and the structural equation modeling was made on the basis of the contents surveyed. The main results of this study are summarized as follows. Firstly, tangibles structured with store clearance, neat uniform, information and others is the factor of service quality satisfaction. Secondly, reliability structured with service practice, problem solving, and service in accurate time is the factor of service quality satisfaction. Thirdly, assurance structured with the reliability of employees, sufficient knowledge of employees, courteous and good manner is the factor of service quality satisfaction. Fourthly, responsiveness structured with prompt service, voluntary help, customer response service and the like is the factor of service quality satisfaction. Fifthly, the sympathy structured in interest for each customer, provision of service in time convenient to use, encountering the customers with genuine feeling are the factors of service quality satisfaction. And sixthly, the service satisfaction factors would influence on the consumer behavior factors.
방사능(선)에 관한 차세대 인식도 및 교육방향에 대한 고찰
서동우,김경연,김종은,배현학,손재호,전민규,정재은,Seo, Dong-Woo,Kim, Kyeong-Yeon,Kim, Jong-Eun,Bae, Hyun-Hak,Son, Jae-Ho,Jeon, Min-Gyu,Jung, Jae-Eun 대한디지털의료영상학회 2014 대한디지털의료영상학회논문지 Vol.16 No.1
Sens of insecutity of the public and professionals about harmful effects of radiation is increasing in an accident at the Chernobyl and Fkushima nuclear power plant.Anxiety was amplified to lack of information about radiation majority of people. To target the middle and high school in the region of Daegu and Gyeongsangbuk-do, to investigate the radiation recognition of the next generation, it is intended to present a model of education for the safe use of radiation. The High School of the six metropolitan cities, city, town through the questionnaire and needs to be educational experience of radiation and use knowledge level of radiation, experience in daily life, understanding of man-made radiation and natural radiation, information channel on radiation, the radiation Distribute the total 800 parts of, to recover the 629 unit, was analyzed for 155 females 474 males. Many people 75.36% of the people, to 24.64% female subjects of this investigation, was constant, respectively from 13 to 18 years age. It is a large number and 30.37% of the respondents as "normal" level of knowledge of radiation, for the type of radiation, most knew. You have answer for risk experience of the medical radiation was higher, touching a lot of information via the broadcast medium in general, and the accuracy is low. I thought we wanted to be educated three or more twice a year, as an educator,about 71.37% and radiation-related understanding of knowledge and background in accordance with the diversification of information channels, the regional differences between urban and rural areas. But I considered the difference age (grade) for each is displayed, intended for junior high school students, the target surface and use the occurrence of radiation, high school students, the need for education about risk and application of radiation through this study.
서동우(Dong-Woo Seo),김병철(Byung-Chul Kim),정규산(Kyu-San Jung),나원기(Wongi Na),박기태(Ki-Tae Park) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.12
본 연구는 PSC(Post Tensioned Concrete) 교량 및 사장교(Cable Stayed Bridge) 등에 많이 적용되는 강연선의 국부적 손상에 따른 응력 회복길이를 분석하였다. 강연선은 PC 강선(Prestressing Strand)을 여러 줄을 꼬은 강재이며, 재료의 특성상 준공후 지속적으로 손상이 발생하며 부식 등이 주요 손상원인이다. 이에 따른 손상에 따른 성능저하가 발생하지만, 구조적인 특성상 케이블 내부의 손상 정도 및 응력 변화 패턴을 파악하기 어렵다. 교량에 적용된 케이블의 경우 설치 형상에 따라 채수 등에 따라 부식이 취약한 부분이 발행하며, 이로 인해 국부적인 손상이 발행할 수 있다. 본 연구는 교량 Post-Tensioning 또는 케이블 사장재에 주로 적용되는 강연선(7-Wire Strand)의 국부적 손상에 따른 성능저하 경향 및 응력 회복길이를 FEA 해석을 통하여 분석하였다. 향후 본 연구에서 구축하고자 하는 해석모델을 활용하여 PSC 교량 및 사장교 케이블 등의 안전성 평가 및 잔존수명 예측에 활용될 수 있을 것으로 사료된다. This study examined the stress recovery length due to the local damage of a 7-wire strand, which is applied widely to PSC(Post Tensioned Concrete) bridges and cable-stayed bridges. The 7-wire strand is a multiple stranded steel of PC prestressing strand. Owing to the nature of the material, it is damaged continuously after completion with corrosion being the main cause of damage. On the other hand, due to its structural characteristics, it is difficult to grasp the degree of damage inside the cable and the pattern of stress variation. In the case of cables applied to bridges, the parts that are susceptible to corrosion are generated depending on the water supply and installation shape, which may cause local damage. This study analyzed the tendency of performance degradation and stress recovery length according to local damage of a 7-wire strand, which is applied mainly to bridge post-tensioning or stay cables. This study developed a computer-based simulation model that was validated with experimental results. The model developed in this study can be used to evaluate the safety level and estimate the remaining life span of PSC bridges or cable-stayed bridges.
서동우 ( Seo Dong-woo ),김가영 ( Kim Ga-young ),김병철 ( Kim Byeong-cheol ),박기태 ( Park Ki-tae ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
In case of cable supported bridges, the cable system is a very important element that transfers the load of the girder to the pylon or substructure is the most important feature. The safety management of these cable systems is very important because they are directly linked to the safety of the entire bridge. This paper presents the applicability of the acoustic emission (AE) method is one of the non-destructive evaluation methods, is evaluated for the detection and monitoring of bridge cable damage. In order to verify the performance of the cable inspection method using the AE sensor, experiments were conducted. As a result, it is considered that the acoustic emission technique will be able to detect corrosion breakage and signs of rupture of cables if sufficient database of AE signal with various environmental conditions is secured.
서동우 ( Seo Dong-woo ),진승섭 ( Jin Seung-seop ),김재환 ( Kim Jaewhan ),공민준 ( Kong Min-joon ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
본 연구에서는 사장교 케이블의 내·외부 점검이 가능한 케이블 점검 로봇 개발을 수행하였다. 케이블 점검 로봇은 HD 카메라를 이용하여 360° 영상 촬영으로 외관 조사가 가능하며, 무선통신 3축 가속도계로 케이블의 장력을 측정할 수 있다. 또한, 전자기 센서 모듈을 추가하여 케이블 내부 탐상이 가능하도록 하였다. 사장교 케이블은 다발의 강연선 또는 소선으로 구성되어 있는 특성 및 본 연구에서 적용한 비파과검사기법의 기술적 한계로 인하여 최 외측 강연선 또는 소선의 손상 여부에 대해서만 점검이 가능한 것으로 판단된다. 본 논문에서는 점검