• 산업융합연구
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• 제20권2호
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• pp.37-44
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• 2022

본 연구는 비동시적 온라인 토론활동에 참여한 간호대학생의 사회적 실재감, 인지적 실재감이 온라인학습만족도에 미치는 영향을 파악하고자 시도되었다. 연구는 2020년 12월부터 2개월간 일개대학 4학년 간호대학생 93명을 대상으로 설문조사하였다. 수집된 자료는 t검정, ANOVA, 상관관계, 다중회귀분석을 실시하였다. 연구결과 간호대학생의 사회적 실재감, 인지적 실재감, 온라인 학습만족도는 유의한 정적 상관관계를 보였고, 온라인 학습만족도에 직접적인 영향요인으로는 사회적 실재감으로 나타났다. 온라인 학습만족도에 대한 설명력은 62.9%로 나타났다. 결과를 바탕으로 다양한 교과목에서 온라인 토론활동의 학습만족도를 높이기 위해서 간호대학생의 사회적 실재감을 높이는 방안이 필요하며 향후 실재감 향상 프로그램 중재 관련 후속연구를 제언한다.

• 약학회지
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• 제47권6호
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• pp.432-437
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• 2003

It has been known that quercetin, a bioflavonoid widely distributed in fruits and vegetables as dietary-derived flavonoid and exert significant multiple biological effects such as antioxidant and anti-inflammatory, anti-tumor effects. In addition, it has been shown to have a chemoprotective role in cancer, though complex effects on signal transduction involved in cell proliferation and angiogenesis. The present study investigated whether quercetin can enhance antioxidant enzyme activity (glutathione peroxidase: GPx, superoxide dismutase: SOD, catalase: CAT) and regulate the reactive oxygen species (ROS) generation in the presence of vitamin E, L-ascorbic acid, reduced glutathione (GSH) on B16F10 murine melanoma cells. After 48h treatment of cells with quercetin in the presence of vitamin E, L-ascorbic acid, GSH, we measured the cytotoxicities by MTT assay. The cells exhibited a dose-dependent inhibition in their proliferation in the presence of vitamin E, L-ascorbic acid, GSH respectively. We also investigated the effects of antioxidant enzyme activity and ROS generation. The antioxidant enzyme activity of quercetin in the presence of vitamin E was stronger than GSH, L-ascorbic acid, the same treatments decreased ROS generation in B16F10 murine melanoma cells. Taken together, these result demonstrate that the antioxidant effect of quercetin can enhanced in the presence of vitamin E and it might plays an important role in anti-oxidative effects.

• 한국콘텐츠학회논문지
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• 제22권7호
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• pp.136-148
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• 2022

본 연구는 챗봇서비스를 이용한 소비자의 고객경험이 브랜드 신뢰와의 관계에 미치는 영향에 대해서 살펴보고자 하였다. 인터넷 쇼핑몰을 통해서 챗봇서비스를 경험한 소비자를 대상으로 설문조사를 실시하였고, 최종 299부의 유효한 데이터를 분석하여 연구가설을 검증하였다. 분석결과 챗봇서비스를 이용한 고객의 경험은 챗봇 신뢰에 긍정적인 영향을 미치고, 챗봇 신뢰의 매개역할을 통해 쇼핑몰 신뢰, 판매자 신뢰 및 브랜드 신뢰에 긍정적인 영향을 미치며, 챗봇의 사회적 실재감은 신뢰의 전이 과정에서 조절효과를 갖는 것으로 나타났다. 본 연구를 통하여 챗봇서비스를 경험한 고객의 경험이 챗봇 신뢰를 매개로 하여 브랜드 신뢰에 긍정적인 영향을 미친다는 이론적 토대를 마련할 수 있었으며, 챗봇서비스가 마케팅의 중요한 수단이 될 수 있다는 점에서 시사점을 제공해 줄 수 있다. 향후 연구에서는 챗봇 신뢰와 관련한 다양한 연구가 필요하다.

• Bulletin of the Korean Chemical Society
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• 제14권1호
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• pp.107-109
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• 1993

Non-enzymatic glycosylation and fragmentation of collagen molecule were investigated by irradiating Ultraviolet A(UV-A) with or without scavengers of reactive oxygen species (ROS) in the presence of glucose. Non-enzymatic glycosylation was increased by UV-A at high concentration of glucose. It was reduced in the presence of the scavengers of superoxide radical and singlet oxygen, but not reduced in the presence of hydroxy radical scavenger. Fragmentation of collagen was increased by UV-A, but it was decreased in the presence of all ROS scavengers tested. Superoxide radical and singlet oxygen produced by autoxidation of glucose without UV-A may encounter the initial phase of glycosylation. Data presented here suggest that UV-A affects only on the fragmentation process, but all ROS except hydroxy radical act on both processes. It appears that hydroxy radical does not act on the glycosylation process.

• 한국게임학회 논문지
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• 제21권3호
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• pp.147-156
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• 2021

In this paper, we planned to see the positive effects of the immersive virtual environment. In particular, the positive effect of presence on physical performance was explored. A total of 25 participants were recruited for this experiment and his/her physical performance was measured by Electromyography (EMG) while they were exercising (rowing), and presence was measured by a self-reported measure. The participants were randomly assigned to experience either a) Virtual Reality (VR) or b) non-VR (2D screen) condition when they played the exergame. The result showed that 1) there was a positive relationship between representation mode and presence and 2) the higher level of presence reinforced the user's physical performance. The limitation of the study and future study were also discussed.

• 벤처창업연구
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• 제17권3호
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• pp.119-133
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• 2022

팬데믹 사태는 사회구성원들의 행동 방식을 급격히 변화시키고 있다. 대표적으로, 바이러스의 강력한 전염력은 현실 세계에서 사람 간의 교류 행동을 최소화하는 것을 요구하고 있으며, 사람들은 온라인 활동을 통해 대처하고 있다. 온라인 내 활동 및 경험에 대한 현실적 느낌이 강조되면서, 3D 기술 중심의 실재감 역량을 강화한 메타버스가 중요한 교류 도구로서 인식되고 있다. 본 연구는 메타버스를 도입하고자 하는 스타트업 등 기업의 관점에서 사용자의 메타버스 이용 조건을 제시함으로써, 비즈니스 모델 확립에 도움을 주고자 한다. 세부적으로, 본 연구는 이용과 충족 이론을 활용하여 메타버스 사용자의 이용 동기를 제시하고, 메타버스가 제공하는 기술 기반의 실재감과 개인의 특성(규범 대인 민감성)이 메타버스 사용자의 이용 및 충족 조건을 어떻게 강화하는지를 확인한다. 본 연구는 메타버스를 경험한 20세 이상의 사람에게 설문을 수행하였으며, 확보된 314개의 표본을 적용해 AMOS 22.0과 Process 3.1 툴을 활용하여 연구 가설을 검증하였다. 가설 검증 결과, 메타버스 실재감(원격 실재감, 사회적 실재감)이 메타버스 이용 및 충족 요인(정보성, 즐거움, 사회적 상호작용성)을 높여 지속적 이용 의도를 강화하는 것을 확인하였다. 또한, 개인의 규범적 대인 민감성이 즐거움과 사회적 상호작용성이 지속적 이용 의도에 미치는 긍정적 영향을 조절하는 것을 확인하였다. 연구 결과는 메타버스 관련 기업의 사용자 맞춤형 비즈니스 모델 수립을 위한 다각적 전략수립에 도움을 준다.

• The Journal of Asian Finance, Economics and Business
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• 제8권10호
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• pp.219-228
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• 2021

The study examines the behavior of stock prices after large price changes. It further examines the effect of firm size on stock returns, and the presence of the disposition effect. The study employs the event study methodology using daily price data from Pakistan Stock Exchange (PSX) for the period January 2001 to July 2012. Furthermore, to examine the factors that explain stock price behavior after large price movements, the study employs a two-way fixed-effect model that allows for the analysis of unobservable company and time fixed effects that explain market reversals or continuation. The findings suggest that winners perform better than losers after experiencing large price shocks thus showing a momentum behavior. In addition, the winners remain the winner, while the losers continue to lose more. This suggests that most of the investors in PSX behave rationally. Further, the study finds no evidence of disposition effect in PSX. The investors underreact to new information and the prices continue to move in the direction of initial change. The pooled regression estimates show that firm size is positively related to post-event abnormal returns while the fixed-effect model reveals the presence of unobservable firm-specific and time-specific effects that account for price continuation.

• 대한인간공학회지
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• 제34권6호
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• pp.597-607
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• 2015

Objective: The purpose of this study is to identify the effects of sign language video location in e-learning system for the hearing-impaired. Background: E-learning education is a good way to resolve the inequality of education for the disabled. Providing a sign language video in e-learning education for the hearing-impaired is very important for their learning. Although the location of sign language video is an important factor in the design of the video, the effect of its location in learning using the e-learning system was not studied. Method: In order to identify the effect of sign language video location on the learning of the hearing-impaired using the e-learning system, the prototypes of the system with different locations were developed. Eighteen people with hearing impairment participated in this experiment. Learning presence, learning immersion, and learning satisfaction were used to measure learning effects with sign language video location. Results: Bottom right position was more preferred through preference evaluation for sign language video location. The learning effect with sign language video location (bottom-left and bottom-right) was not significant. That is, the effects of learning presence, immersion, and satisfaction were not statistically significant with video location. Conclusion: From this study, the following have to be considered in e-learning system design for the hearing-impaired. Although the location of a sign language video is not a significant factor from the experiment, the bottom right position in the design is proposed because learning presence and satisfaction is slightly higher at the bottom right position, and the position is preferred from subjective evaluation. From the analysis of interview data, it was also proposed that the design of a sign language video should be improved for the hearing-impaired. Application: The result of this study can be applied to the e-learning system design for the hearing-impaired.

• 한국의류학회지
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• 제46권3호
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• pp.464-480
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• 2022

With the steady development of Artificial Intelligence (AI), online stores are adopting chatbot services as virtual shopping assistants. This study proposes the concept of para-social presence to explore the undiscovered role of fashion chatbots' emotional and relational characteristics on service acceptance. Based on the Technology Acceptance Model (TAM), this study investigates the effect of a chatbot's para-social presence on service acceptance intention through consumers' beliefs. The web-based experiment was conducted on adult consumers who experienced chatbot services in an online shopping situation. A total of 247 responses were analyzed using confirmatory factor analysis, structural equation modeling, and multi-group SEM by AMOS 21.0 and SPSS 23.0. The findings illustrate that the chatbot's intimacy positively influenced consumers' perceived enjoyment, while the chatbot's understanding had a significant effect on perceived usefulness and ease of use. The chatbot's involvement had a positive effect on all consumer beliefs. Moreover, perceived ease of use had a positive influence on usefulness. A greater level of perceived usefulness and enjoyment positively heightened consumers' service acceptance intention. This study also verifies the moderating role of a need for human interaction. Consumers with a high need for human interaction have a relatively low tendency to perceive chatbot services as useful.

• 품질경영학회지
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• 제51권1호
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• pp.97-117
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• 2023

Purpose: The purpose of this study is to examine the factors affecting the intention to continue using the metaverse platform service from the user's point of view. Methods: The study conducted a survey of experienced people using Zepeto, Ifland, Gather Town, Zep, Roblox, Fortnite, and Minecraft, which are virtual world types among metaverse types, and valid 415 data were analyzed by SPSS (ver 22.0) and R (ver 4.1.0) program packages. Results: As a result of empirical analysis, it was found that interactivity and social presence among the characteristics of metaverse affected expectation confirmation, and sensory affordance and functional affordance affected expectation confirmation as affordance factors. In addition, all four characteristics of metaverse, reliability, playfulness, interactivity, and social presence, were found to have the greatest affect on perceived usefulness, and it was analyzed that playfulness, social presence, and reliability were influenced in order. The affordance factor was also found to have a positive effect on physical affordance, sensory affordance, and functional affordance. This study was found that it had a positive effect on the relationship between expectation confirmation and satisfaction and the relationship between perceived usefulness and satisfaction. satisfaction was analyzed to lead to continuance intention. Conclusion: This study is meaningful in that it examines the perspective of users who can be called customers of metaverse platform services. Based on the results of this study, it is expected to have a significant effect on the development of metaverse platform services not only on platform operators that provide metaverse platform services but also on providers who plan events and education using metaverse platform services.