해외여행상품의 지각된 가치가신뢰 및 구매의도에 미치는 영향

류동균 한국호텔리조트학회 2018 호텔리조트연구 Vol.17 No.4

The purpose of this study is to recognize how emotional value, functional value, functional quality, and social value which are sub-dimensions of travelers’ recognized values to overseas travel products influence on trust and purchase intention and to provide useful information to the marketing of overseas travel agency by validating the causality which trust influences on purchase intention. From January 10 to January 30, 2018, the data was collected for 10 days. Total 400 copies of questionnaires were distributed, 341 copies of them were collected, and 333 copies excluding 8 which were faithlessly responded were used to analyze as effective samples. Results of analysis can be summarized as follow: First, it was analyzed that emotional value, social value, and price value influenced a significant effect on reliability. However, it was indicated that quality value did not influence a significant positive (+) effect on reliability; Second, it was analyzed that price value and quality value influenced a significant positive (+) effect on purchase intention. While it was indicated that emotional value and social value did not influence a significant positive (+) effect on purchase intention.

소아기 기도내 이물흡인의 임상적 고찰

류동균,박수진,박강서,김완섭 예수병원 1996 예수병원학술지 Vol.17 No.-

Control and Design of a Arc Power Supply for KSTAR’s the Neutral Beam Injection

류동균,이희준,원충연,이정효 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.1

The neutral beam injection generate ultra-high temperature energy in the tokamak ofnuclear fusion. The neutral beam injection make up arc power supply, filament power supply andacceleration & deceleration power supply. The arc power supply has characteristics of low voltage andhigh current. Arc power supply generate arc through constant output of voltage and current. So thispaper proposed suitable buck converter for low voltage and high current. The proposed buck converterused parallel switch because it can be increased capacity and decrease conduction loss. When an arcgenerated, the neutral beam injection chamber occur high voltage. And it will break output capacitor ofbuck converter. Therefore the output capacitor was removed in the proposed converter. Thus theproposed converter should be designed for the characteristics of low voltage and high current. Also,the arc power supply should be guaranteed for system stability. The proposed parallel buck converterenables the system stability of the divided low output voltage and high current. The proposed converterwith constant output be the most important design of the output inductor. In this paper, designed arcpower supply verified operation of system and stability through simulation and prototype. After it isapplied to the 288[kW] arc power supply for neutral beam injection.

신경망 기반의 유기된 물체 인식 방법

류동균,이재흥 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.4

This paper proposes a method of recognition abandoned objects using convolutional neural networks. The method firstdetects an area for an abandoned object in image and, if there is a detected area, applies convolutional neural networksto that area to recognize which object is represented. Experiments were conducted through an application system thatdetects illegal trash dumping. The experiments result showed the area of abandoned object was detected efficiently. Thedetected areas enter the input of convolutional neural networks and are classified into whether it is a trash or not. Todo this, I trained convolutional neural networks with my own trash dataset and open database. As a training result, Iachieved high accuracy for the test set not included in the training set. 본 논문에서는 합성곱 신경망을 이용한 유기된 물체 인식 방법을 제안한다. 유기된 물체 인식 방법은 영상 내에서 유기 물체에 대한 영역을 먼저 검출하며 검출된 영역이 있을 경우 해당 영역에 합성곱 신경망을 적용하여 어떤 물체를 나타내는지인식하는 과정을 거친다. 실험은 쓰레기 무단투기를 검출하는 응용 시스템을 통해 진행되었다. 실험 결과, 유기 물체에 대한영역을 효율적으로 검출하는 것을 볼 수 있었다. 검출된 영역은 합성곱 신경망으로 들어가 쓰레기인지 아닌지 분류되는 과정을 거쳤다. 이를 위해 자체적으로 수집한 쓰레기 데이터와 오픈 데이터베이스로 합성곱 신경망을 학습시켰다. 학습 결과, 학습에 포함되지 않은 테스트셋에 대해 약 97%의 정확도를 달성하였다

체육 스포츠권의 법적 근거

류동균(Dong Kyun Ryu) 한국사회체육학회 1999 한국사회체육학회지 Vol.12 No.-

모바일 크라우드센싱 환경에서의 연합학습 연구 동향

류동균(Dongkyun Ryoo),전유빈(Youbin Jeon),백상헌(Sangheon Pack) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.6

ZCS 보조회로를 이용한 ZVT Boost 컨버터에 관한 연구

류동균(D.K. Ryu),이우석(W.S. Lee),최태영(T.Y. Choi),서민성(M.S. Seo),원충연(C.Y. Won),김영렬(Y.R. Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-

Recently, a ZVT boost converter is embedded in a power factor correction system. The control circuit of the converter assures soft-switching for all the MOSFETs and load regulation The PFC system contains additional control circuits which assure the input voltage in a sinusoidal form and feed-forward line voltage regulation. In this paper, a soft switching boost converter with zero-voltage transition(ZVT) main switch using zero-current switching(ZCS) auxiliary switch is proposed. Operating intervals of the converter are persented and analyzed. The proposed results show that the main switch maintains ZVT while auxiliary switch retains ZVT whiles auxiliary switch retains ZCS for the complete specified line and load conditions.<br/> <br/>

LED TV를 위한 단일전력단 전류평형 다채널 LED 구동회로

류동균(Dong-Kyun Ryu),원충연(Chung-Yuen Won),한상규(Sang-Kyoo Han) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.6

A single-stage current-balancing multi-channel light-emitting diode (LED) driver is proposed in this study. The conventional LED driver system consists of two cascaded power conversion stages, i.e., an isolation DC/DC converter and LED driver. LED driver is usually implemented with the same number of expensive boost converters as those of LED channels to tightly control the current through each LED channel. Therefore, its overall system size is not only bulky, but the cost is rather high. By contrast, the proposed LED driver system is composed of a single power stage with the DC/DC converter and LED driver merged. Although the current balancing circuit of the proposed LED driver requires only passive devices instead of expensive boost converters, all currents through multi-channel LEDs can be well balanced. Therefore, the proposed LED driver features a small system size, improved efficiency, and low cost. To confirm the validity of the proposed driver, its operation and performance are verified on a prototype for a 46"" LED TV.

AdaBoost와 모션 검출을 이용한 실시간 얼굴 검출

류동균 ( Dong-gyun Ryu ),이재흥 ( Jae-heung Lee ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1

Viola와 Jones가 제안한 AdaBoost(Adaptive Boosting) 알고리즘은 기존의 물체 검출기에 비해 속도와 정확도 면에서 우수하여 실시간 물체 검출기로써 좋은 성능을 보인다. 하지만 여전히 많은 계산량 때문에 성능이 낮은 임베디드 환경에서는 실시간 검출에 대한 아쉬움이 있다. 본 논문에서는 계산량을 줄이기 위해 모션 검출을 통해 배경 영역을 제거하고 얼굴 영역을 추정한다. 제거된 배경 영역은 AdaBoost 알고리즘의 검출 과정에서 제외되며 추정된 얼굴 영역에 대해서만 검출을 하게 된다. 모션 검출은 Σ-Δ(Sigma-Delta) 배경 추정에 기반한 알고리즘을 사용한다.

국립공원 탐방객의 개인적 규범에 따른 친환경행동의도와 국립공원관리정책 지지도 차이분석

류동균(Dong-gyun Ryu),박경심(Kyung-shim Park),김태훈(Tae-hun Kim),주영환(Young-hwan Ju) 한국관광연구학회 2016 관광연구저널 Vol.30 No.1

National parks are our natural and cultural heritage, and also the significant tourist destination. The number of visitors to national parks has been constantly increased. However, in spite of the increased visitors, the natural and cultural elements of National parks have also been devastated. If we consider that a visitor himself/herself is the agent of the devastation, it is important to identify factors that control his/her behaviors. This paper examined differences in national park visitors’ pro-environment behavioral intention and support for national park managerial policies by personal norm. We conducted on-site surveys along with conveniently selected visitors who visited the Seolaksan National Park from June 20 to August 31, 2014. We collected a total of 354 questionnaires but used only 315 questionnaires for data analysis after getting ridof 39 incomplete ones. We used independent t-tests to test research hypotheses. Major findings were: first, depending upon respondents’ strength of their personal norm, all of the 12 pro-environmental behaviors showed statisticallysignificant differences. Those who showed stronger personal norm indicated hinger level of pro-environmental behavior than their counterpart. Second, in terms of support for the national park managerial polices, there were statistically significant differences in only 5 of the 10 items by visitors’ personal norm, although those who showed stronger personal norm indicated stronger support for the items than their counterpart. We also discussed theoretical and practical implications of the research.