Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators

정소원,Pham Van-Duyen,안병권,백부근 대한조선학회 2024 International Journal of Naval Architecture and Oc Vol.16 No.-

In this study, physical aspects of a ventilated supercavity behind different cavitator geometries such as the hydrodynamic characteristics, distribution of pressure within the cavity, hysteresis phenomenon, and gas leakage mechanism were qualitatively and quantitatively investigated using experimental and numerical methods. For the simulation and tunnel tests, we employed five cavitators, each with different angles (45◦, 60◦, 90◦, 135◦, and a 180◦ cavitator, commonly referred to as a disk cavitator), all sharing the same diameter. The results revealed that the drag force experienced on the cavitator decreased linearly with an increase in the ventilation rate, and a consistent trend was observed for all test cavitator angles. Through experimental measurements, a universal equation has been derived to predict the drag force exerted on a supercavitating vehicle employing a cavitator. In addition, the pressure distribution inside the supercavity was significantly influenced by the angle of the cavitator. The pressure kept almost unchanged in the first half of supercavity; a slight increase in pressure occurred in the remainder of the supercavity. Twin-vortex gas leakage mode was clearly observed. The distance between the two hollow vortices increased significantly, whereas the incline angle of these vortices and the horizontal line changed insignificantly.

온라인 브랜드 커뮤니티에서 커뮤니티 이용 동기가 지식 공유와 브랜드 충성도에 미치는 영향

정소원,박지선,이규혜 한국브랜드디자인학회 2014 브랜드디자인학연구 Vol.12 No.1

온라인 커뮤니티가 급속도로 증가함에 따라 온라인 커뮤니티가 소비자 구매와 행동에 미치는 영향력이 크게 증가하였다. 이에 본 연구는 온라인 브랜드 커뮤니티에서의 소비자 행동을 이해하고자 소비자의 다양한 브랜드 커뮤니티 이용 동기(상호유대 효용, 브랜드 애호, 흥미 추구, 정보 추구, 보상 추구, 편의 추구)를 탐색하고 다양한 이용 동기와 지식 공유의 질과 양, 브랜드 충성도 사이의 구조적 관계를 연구하고자 한다. 실증 분석을 위해 일반 브랜드 커뮤니티 가입자를 대상으로 온라인 설문을 실시하였고 최종 228부의 응답을 바탕으로 구조방정식모형을 실시하였다. 연구 결과 6가지 커뮤니티 이용 동기 중 브랜드 애호와 정보 추구 동기만이 지식 공유의 질과 양에 긍정적이고 유의한 영향을 미쳤으며, 지식 공유의 질과 양 모두 브랜드 충성도에 긍정적인 영향을 미친 것으로 나타났다. 본 연구 결과는 브랜드 마케터는 소비자가 활발하고 적극적으로 지식을 공유하게 함으로써 브랜드 충성도를 높이기 위해서 브랜드 애호와 정보 추구 동기에 주목할 필요가 있음을 시사한다. With the emergence of online community, influence of online communities on consumer behavior has greatly been increased. To enhance our understanding of consumer behavior in online brand communities, the present study attempts (a) to explore various motives of consumers(interpersonal utility, brand likeability, entertainment seeking, information seeking, incentive seeking, convenience seeking) evoked when they use online brand communities and (b) to uncover the structural relationships between identified motives and their outcome variables such as quality and quantity of knowledge sharing and brand loyalty. An online survey method was conducted by employing sample of brand community members. Final sample size was 228. Structural equation modeling results found positive impacts of brand likeability and information seeking motives on quality and quantity of knowledge sharing. As expected, both quality and quantity of knowledge sharing positively influenced brand loyalty. Findings of present study suggests that brand marketers need to focus on consumers motivated by brand likeability and information seeking when using brand communities in order to make them actively share their knowledge, ultimately to enhance their loyalty toward their brand.

해시를 활용한 사이버킬체인 기반의 사물인터넷 보안 정책

정소원,최유림,이일구 한국디지털정책학회 2018 디지털융복합연구 Vol.16 No.9

모바일 어플리케이션 사용 시 소비자 경험 연구

정소원,이승희 한국유통학회 2011 한국유통학회 학술대회 발표논문집 Vol.2011 No.11

Social Capital and Technology Alliance Performance of Korean Exporting SMEs

정소원,최순규,문희진,정재은 한국생산관리학회 2018 韓國生産管理學會誌 Vol.29 No.2

Focusing on the technology alliances of Korean exporting SMEs, the present study investigated the effects of social capital (social interactions, shared vision, and trust) on strategic alliance performance and the effect of alliance partner country type on the positive relationship between social capital and alliance performance. Multiple regression analyses of 156 exporting SMEs with major technology alliances revealed that social interactions, shared vision, and trust in technology alliance partners strongly and positively affected alliance performance. In particular, the positive effect of shared vision on alliance performance was amplified. However, the effect of trust on performance was diminished when the technology alliance of an SME was domestic rather than foreign. This research contributes to the expansion of the SME literature and provides insights to exporting managers of SMEs by examining the role of three dimensions of social capital on technology alliance performance among Korean SMEs in terms of the effect of partner country.

Repetitive Transcranial Magnetic Stimulation for Wernicke-Korsakoff Syndrome: A Case Report

정소원,박신후,서영재,김재형,이찬호,임종엽 대한재활의학회 2017 Annals of Rehabilitation Medicine Vol.41 No.1

A 57-year-old man who was diagnosed with Wernicke-Korsakoff syndrome showed severe impairment of cognitive function and a craving for alcohol, even after sufficient supplementation with thiamine. After completing 10 sessions of 10 Hz repetitive transcranial magnetic stimulation (rTMS) at 100% of the resting motor threshold over the left dorsolateral prefrontal cortex, dramatic improvement in cognitive function and a reduction in craving for alcohol were noted. This is the first case report of the efficacy of a high-frequency rTMS in the treatment of Wernicke-Korsakoff syndrome.

한국 중소벤처기업의 역량이 해외진출성과에 미치는 영향: 시장동태성과 기술동태성의 조절효과

정소원,원종현,Jeong, So Won,Won, Jong-Hyeon 한국벤처창업학회 2015 벤처창업연구 Vol.10 No.2

본 연구에서는 해외에 진출한 한국 중소벤처기업의 역량이 해외진출성과에 미치는 영향과 환경동태성이 이 관계에 어떠한 역할을 하는지 살펴보고자 한다. 구체적으로 중소벤처기업의 해외 마케팅역량, 기술역량 및 해외 네트워크역량이 해외진출성과에 미치는 영향에 대해 분석하고, 환경동태성의 두 가지 차원인 시장동태성과 기술동태성이 이 관계에서 조절변수로서 어떠한 역할을 하는지에 대해 실증적으로 검증하고자 한다. 162개의 중소벤처기업을 대상으로 한 다중회귀분석 결과, 해외 마케팅역량은 해외진출성과에 유의한 영향력을 미치지 않는 것으로 나타났으나, 기술역량과 네트워크역량은 각각 해외진출성과에 긍정적이고 유의한 영향을 미치는 것으로 나타났다. 또한, 시장동태성은 네트워크역량과 해외진출성과 간의 관계에 부(-)의 조절효과를 갖는 것으로 나타났으며, 기술동태성은 기술역량과 해외진출성과 간의 관계에 부(-)의 조절효과를, 네트워크역량과 해외진출성과 간의 관계에는 정(+)의 조절효과를 갖는 것으로 나타났다. 본 연구의 결과는 중소벤처기업의 국제화성과에 있어 마케팅, 기술, 네트워크 역량의 중요성을 확인하고, 이에 대한 환경동태성의 영향력을 확인함으로써 중소벤처기업이 해외진출 시 성공적인 성과를 올릴 수 있는 전략적 활용을 도울 것이다. This study aims to investigate the impacts of small venture firms' capabilities on their international performance and the role of environmental dynamics in these relationships. Specifically, the study examines how international marketing, technology, and network capabilities of small venture firms influence their international performance and how market and technology turbulences moderates these relationships. Employing 162 small venture firms in Korea, the result of multiple regression analysis found that marketing capability did not affect international performance while technology and network capabilities had positive, significant impacts on international performance. Market turbulence was found to have a negative moderation effect on the relationship of network capability and international performance. Technology turbulence had a negative moderation effect on the relationship of technology capability and international performance and a positive moderation effect on the relationship of network capability and international performance. The findings confirm the importance of capabilities in improving the international performance of small venture firms and generate strategic implications for their international success by emphasizing the effect of environmental dynamics.

주기적으로 거동하는 유동장의 인공 초월공동에 대한 실험연구

정소원,박상태,안병권 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.2

Recently a supercavitating underwater vehicle moving at high speed over 200 knots has been of interest for its practical advantage of the dramatic drag reduction. Many experimental and numerical studies have been explored, however most of the studies deal with the case of uniform flows. In this paper, we investigated physical behaviors of the artificial supercavity in a periodic gust flow. Experiments were carried out at a cavitation tunnel of the Chungnam National University(CNUCT), which is equipped to remove the gas supplied from outside of the tunnel. We devised an experimental apparatus generating vertical and horizontal gust flows, and investigated the supercavity formations at different periodic mode of the incoming flow.

기술불안감과 지각된 생산성이 셀프서비스테크놀로지에 대한 태도에 미치는 영향 - 상호작용욕구의 조절효과를 중심으로 -

정소원,박지선 복식문화학회 2020 服飾文化硏究 Vol.28 No.4

The purpose of this study was to explore how consumer traits(technology anxiety and need for interaction) explain attitude toward self-service technologies in fashion retail stores. We examined if technology anxiety influences perceived productivity and attitude toward self-service technologies, and if so, how the need for interaction with employees moderates the impact of technology anxiety on perceived productivity and attitude. For the purpose of the study, a web-based survey with Korean consumers was conducted. The final sample size was 214. Structural Equation Modeling Analysis and PROCESS in SPSS were employed to test the proposed hypotheses. The findings indicated that technology anxiety negatively affected perceived productivity and attitude toward self-service technologies in which perceived productivity affected attitude positively. Need for interaction with employees was found to moderate the relationship between technology anxiety and perceived productivity. It also moderated the relationship between technology anxiety and attitude. This study contributes to the self-service technology literature by identifying two antecedents of consumer attitude toward self- service technologies: technology anxiety and the need for interaction. The findings further provide valuable insights to retailers and marketers as to how technology anxiety, perceived productivity, and the need for interaction work in enhancing consumer attitude toward self-service technologies in the context of fashion retail.

Cope North 훈련 소개

정소원 한국항공우주의학협회 2022 항공우주의학 학술대회 Vol.2022 No.5