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평가인자 가중치에 대한 베이지안 추론과 민감도 분석을 통한 적정 하천설계빈도 결정
유재희,김지은,이진영,박경운,김태웅,Ryu, Jae Hee,Kim, Ji Eun,Lee, Jin-Young,Park, Kyung-Woon,Kim, Tae-Woong 대한토목학회 2022 대한토목학회논문집 Vol.42 No.5
In Korea, annual precipitation and its variability have gradually increased since modern meteorological observations began, and the risk of disasters has also been increasing due to significant regional variations and recent abnormal climate conditions. Given that damage from storms and floods mainly occurs around rivers, it is crucial to determine the appropriate design frequency for river-related projects. This study examined existing design practices used to determine hydrological design frequencies and suggested a new method to determine appropriate design frequencies. The study collected available data pertaining to seven evaluation factors, specifically the basin areas, shape parameters, channel slopes, stream orders, backwater effect reaches, extreme rainfall frequencies, and urbanized flood inundation areasfor 413 local rivers in Chungcheongnam-do in Korea. The estimated weights for areas of extreme rainfall frequencies and urbanized flood inundation were found to be 18, having a great effect on determining the design frequency. Compared with the established design frequency in previous government reports, the estimated design frequency increased for 255 rivers and decreased for 158 rivers.
IPA를 이용한 스포츠이벤트 관람객의 만족요인 연구 -해양스포츠 이벤트 경기국제보트쇼를 중심으로-
유재희 ( Jae Hee Ryu ) 한국이벤트컨벤션학회 2012 이벤트 컨벤션 연구 Vol.8 No.2
This study intended to carry out study from the perspective of sports event visitors by analyzing and evaluating significance and satisfaction on the satisfaction factors using revised IPA. For this purpose, literature study and empirical study was conducted. Data were obtained from visitors who participated in the Korea International Boat Show. A total of 275 were collected, 260 significant samples were analyzed to examine. Results of this study show what problems were and what were well managed from the perspective of visitors perceptions of the Korea International Boat Show. Generally, results of this study indicated that the visitors did perceive lower performance level than importance level.
사회네트워크 구조가 혁신행동과 직무성과에 미치는 영향 -여행사 종사원을 중심으로-
유재희 ( Jae Hee Ryu ),김정준 ( Jung Jun Kim ),이병철 ( Byeong Cheol Lee ) 관광경영학회 2015 관광경영연구 Vol.63 No.-
The purpose of this study is to examines the influence of social network structure on innovative behavior and job performance. Based on literature review, three main components of social network were extracted: a) network size measured by the number of relationship, the number of job-related associational memberships, and the number of non-job-related associational memberships, b) strength of relationship, and c) range of network measured by the extent of relationships with people working in different department and in higher work position. Sample data were collected from employees working at travel agency. A total of 197 samples was used for data analysis. As results, this study found the significant effects of job-related and non-job-related associational membership and the range of network on innovative behavior. Contrary to expectations, the strength of relationship and the size of networked people did not show significant effects on innovative behavior. Based on findings, theoretical and practical implications were discussed.
컨벤션 종사원의 워라밸이 가족관계와 심리적 웰빙에 미치는 영향연구 : 스마트워크 환경의 조절효과
유재희(Jae-Hee Ryu),이병철(Byeong-Cheol Lee) 한국무역연구원 2021 무역연구 Vol.17 No.6
Purpose The purpose of this study is to examine WLB related to family and psychological well-being, and how the smart-work environment perceived by convention employees moderates this relationship. Design/Methodology/Approach The online questionnaire surveys were conducted with employees working at convention centers, convention bureaus, and PCO using e-mail and electronic surveys, and a total of 220 valid samples were used for empirical analysis. Findings Work-family balance clearly showed a positive effect on family relationships and ‘family cohesion’ out of the factors shown to positively affect psychological well-being. It was found that the smart work environments influenced WLB and family relationships. Research Implications This research empirically presents that among the factors of convention employee work-life balance, ‘work-family balance’ is the most important factor, and this study suggests that the introduction of strategies and appropriate smart work environments is necessary for convention employee work-family balance through the verification that the smart work environments introduced for work-life balance had negative effects to the contrary
베이지안 네트워크와 코플라 함수의 결합을 통한 가뭄전이 발생확률의 정량적 분석
신지예,유재희,권현한,김태웅,Shin, Ji Yae,Ryu, Jae Hee,Kwon, Hyun-Han,Kim, Tae-Woong 한국수자원학회 2021 한국수자원학회논문집 Vol.54 No.7
Meteorological drought originates from a precipitation deficiency and propagates to agricultural and hydrological droughts through the hydrological cycle. Comparing with the meteorological drought, agricultural and hydrological droughts have more direct impacts on human society. Thus, understanding how meteorological drought evolves to agricultural and hydrological droughts is necessary for efficient drought preparedness and response. In this study, meteorological and hydrological droughts were defined based on the observed precipitation and the synthesized streamflow by the land surface model. The Bayesian network model was applied for probabilistic analysis of the propagation relationship between meteorological and hydrological droughts. The copula function was used to estimate the joint probability in the Bayesian network. The results indicated that the propagation probabilities from the moderate and extreme meteorological droughts were ranged from 0.41 to 0.63 and from 0.83 to 0.98, respectively. In addition, the propagation probabilities were highest in autumn (0.71 ~ 0.89) and lowest in winter (0.41 ~ 0.62). The propagation probability increases as the meteorological drought evolved from summer to autumn, and the severe hydrological drought could be prevented by appropriate mitigation during that time.
베이지안 네트워크 모형을 이용한 낙동강 유역의 가뭄과 수질관리의 인과관계에 대한 확률론적 평가
유지영,유재희,이주헌,김태웅,Yoo, Jiyoung,Ryu, Jae-Hee,Lee, Joo-Heon,Kim, Tae-Woong 한국수자원학회 2021 한국수자원학회논문집 Vol.54 No.10
This study investigated the change of the achievement rate of the target water quality conditioned on the occurrence of severe drought, to assess the effects of meteorological drought on the water quality management in the Nakdong River basin. Using three drought indices with difference time scales such as 30-, 60-, 90-day, i.e., SPI30, SPI60, SPI90, and three water quality indicators such as biochemical oxygen demand (BOD), total organic carbon (TOC), and total phosphorus (T-P), we first analyzed the relationship between severe drought occurrence water quality change in mid-sized watersheds, and identified the watersheds in which water quality was highly affected by severe drought. The Bayesian network models were constructed for the watersheds to probabilistically assess the relationship between severe drought and water quality management. Among 22 mid-sized watersheds in the Nakdong River basin, four watersheds, such as #2005, #2018, #2021, and #2022, had high environmental vulnerability to severe drought. In addition, severe drought affected spring and fall water quality in the watershed #2021, summer water quality in the #2005, and winter water quality in the #2022. The causal relationship between drought and water quality management is usufaul in proactive drought management.
지역축제서비스품질이 재방문의도에 미치는 영향연구 -연등회 연등축제 중심으로
엽영민 ( Young Min Yeop ),유재희 ( Jae Hee Ryu ) 한국이벤트컨벤션학회 2015 이벤트 컨벤션 연구 Vol.11 No.1
Festivals have a sustainable tourist development that contributes as an alternative to the major role blowing life into the area being the most visible public-oriented activities. This research provided an evaluation measure of the quality of service that reflects the unique characteristics of festivals by identifying the degree of self-awareness actions in accordance with the quality of service and visitors of the festival that had provided some suggestions to deal with the implications for the focus of future marketing activities in local festivals. In order to achieve the objective of this research literature survey and empirical research were used. Throughout the literature survey, service quality measurement tools measure the appropriateness and quality of service tangible, reliability, convenience of venue, festival program characteristics, festival visitor satisfaction, behavioral intention and relevance etc were identified and propose the basis of the research model by previous studies. For empirical research, a total of 109 useful responses were collected and field were analysed using SPSS win21 through frequency analysis and descriptive statistics to verify the authenticity and validity of the data and exploratory factor analysis that were conducted, the multi-regression analysis were applied to test the hypothesis.
패키지투어 여행자의 사회네트워크 구조가 관광만족과 행동의도에 미치는 영향연구
이병철(Lee, Byeong-cheol),유재희(Ryu, Jae-hee),변효정(Byun Hyo-jeong) 한국호텔외식관광경영학회 2015 한국호텔외식경영학회 학술발표논문집 Vol.- No.-
The purpose of this study is to examine the impact of social networks of tourists in group package tour on travel satisfaction and behavioral intention. To measure tourists’ social networks, three main components were selected based on extensive literature review: density, degree of strength, and degree of network’s centrality(degree of connection, closeness and betweenness). In addition to social networks among tourists, the study also measure the degree of tourists’ relationship with tour guide. Data were collected from tourists in group package tours to Turkey. Tour conductors in responsible for each package tour helped tourists complete the survey. A total 330 samples was collected from attendees of 15 Turkey tour packages. As results, there were positive significant impacts of the degree of connection, the degree of relationship with tour guide on travel satisfaction while network density and betweenness showed negative impact on satisfaction. Unlike expectation, network closeness and the strength of relationships did not show significant effects.