• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권10호
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• pp.975-979
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• 2010

기존의 스트리밍 품질 적용 기법들은 네트워크의 혼잡상황에서 네트워크의 안정성을 향상시키는데 반해 스트리밍 서비스의 빈번한 재생품질 변화로 인해 사용자에게 제공되는 스트리밍 서비스의 체감품질을 보장하지 못한다. 본 논문에서는 SVC(스케일러블 비디오 코딩) 비디오 스트리밍 서비스의 체감품질을 보장하기 위해, 네트워크 상태 변화를 고려한 스트리밍 품질 적응 기법을 제안한다. 제안하는 기법은 미디어 특성을 고려한 가용대역폭 측정 기법을 이용하여 네트워크의 가용대역폭을 측정하고, 측정된 가용대역폭을 기반으로 전송되는 SVC 비디오 스트림의 품질 변화를 부드럽게 조절한다. 실험을 통해 제안하는 기법이 재생품질의 변화를 최소화하여 스트리밍 서비스의 체감품질을 보장할 수 있음을 확인하였다.

• 한국응급구조학회지
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• 제23권3호
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• pp.145-154
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• 2019

Purpose: This study simulates cardiac arrest situations in 360° virtual reality video clips and general video clips, and compares the correlations between educational media and experience recognition. Methods: Experimental research was carried out on a random control group (n=32) and experimental group (n=32) on March 20, 2019. Results: The groups where participants were trained with the 360° virtual reality video clips and a higher score of experience recognition (p=.047) than the group where participants were trained with the general video clips. Moreover, the subfactors of experience recognition including the sense of presence and vividness (p=.05), immersion (p<.05). experience (p<.01), fantasy factor (p<.05). and content satisfaction (p<.05) were positively correlated. Conclusion: Enhancing vividness and the sense of presence when developing virtual reality videos recorded with a 360° camera is thought to enable experience recognition without any direct interaction.

• ETRI Journal
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• 제30권1호
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• pp.101-112
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• 2008

In this paper, we present a method to customize the ground color in outdoor sports video to provide TV viewers with a better viewing experience or subjective satisfaction. This issue, related to content personalization, is becoming critical with the advent of mobile TV and interactive TV. In outdoor sports video, such as soccer video, it is sometimes observed that the ground color is not satisfactory to viewers. In this work, the proposed algorithm is focused on customizing the ground color to deliver a better viewing experience for viewers. The algorithm comprises three modules: ground detection, shot classification, and ground color customization. We customize the ground color by considering the difference between ground colors from both input video and the target ground patch. Experimental results show that the proposed scheme offers useful tools to provide a more comfortable viewing experience and that it is amenable to real-time performance, even in a software-based implementation.

• 방송공학회논문지
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• 제25권7호
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• pp.1063-1072
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• 2020

This paper proposes an experimental method for measuring the quality of experience to measure the influence of the participants' immersion, satisfaction, and presence according to the application of sensory effects to 360-degree video. Participants of the experiment watch 360-degree videos using HMD and receive sensory effects using scent diffusing devices and wind devices. Subsequently, a questionnaire was conducted on the degree of immersion, satisfaction, and present feelings for the video you watched. By analyzing the correlation of the survey results, we found that the provision of sensory effects satisfies the 360-degree video viewing, and the experimental method was appropriate. In addition, using the P.910 method, a result was derived that was not suitable for measuring the quality of the immersion and presence of 360-degree video according to the provision of sensory effects.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제22권7호
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• pp.326-331
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• 2016

사용자 콘텐트 소비 중 동영상 콘텐트가 차지하는 비중이 매우 높아지고 있지만, 그로 인해 사용자들은 동영상 콘텐트의 홍수 속에서 초기 로딩 지연 및 콘텐트 소비에 필요한 시간의 부족, 특히 모바일 장치에서의 과도한 트래픽 발생, 그리고 재생 시간에 따른 콘텐트 소비 시간의 부족 등의 문제로 문제 등으로 동영상 콘텐트 재생을를 꺼리게 되는 경우도 발행한다. 제안하는 V2I(Video to Images) 기술은 동영상 콘텐트를 콘텐트 제공자나 사용자의 별도 노력 없이도 연속된 이미지 형태의 요약된 콘텐트로 변환하여 사용자에게 동영상 콘텐트 소비를 위한 새로운 사용자 경험을 제공한다. 본 논문에서는 이러한 V2I 기술을 통해 사용자가 어떻게 동영상 콘텐트를 새로운 형태로 소비할 수 있는지, 이러한 새로운 사용자 경험의 장점은 무엇인지에 대해 소개하고, 또 V2I 전체 시스템의 구조에 대해서도 설명한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권11호
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• pp.4585-4603
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• 2015

Video streaming services make up a large proportion of Internet traffic on both fixed and mobile access throughout the world. Adaptive streaming allows for dynamical adaptation of the bitrate with varying network conditions, to guarantee the best user experience. Adaptive bitrate algorithms face a significant challenge in correctly estimating the throughput as it varies widely over time. In this paper, we first evaluate the throughput estimation techniques and show that the method that we have used offers stable response to throughput fluctuations while maintaining a stable playback buffer. Then, we propose an adaptive bitrate scheme that intelligently selects the video bitrates based on the estimated throughput and buffer occupancy. We show that the proposed scheme improves viewing experience by achieving a high video rate without taking unnecessary risks and by minimizing the frequency of changes in the video quality. Furthermore, we show that it offers a stable response to short-term fluctuations and responds swiftly to large fluctuations. We evaluate our algorithm for both constant bitrate (CBR) and variable bitrate (VBR) video content by taking into account the segment sizes and show that it significantly improves the quality of video streaming.

• 한국콘텐츠학회논문지
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• 제20권7호
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• pp.185-194
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• 2020

본 연구는 숏폼 동영상 기반의 브랜딩에 있어서 브랜드가 소비자들에게 제공하는 전략적 경험 디자인 요소를 사례를 통해 확인하였다. 숏폼 동영상 기반 브랜드의 감각, 감성, 인지, 행동, 관계 경험은 크리에이터가 차별화된 개성을 소셜 미디어 채널을 통해 표현하고 소비자들과 소통하고 상호작용하는 과정에서 구체화된 경험 요소들의 수행으로 제공된다. 李子柒(이자칠)의 미식 동영상은 동방미식생활가(東方美食生活家)로서의 브랜드 정체성을 동영상 속 음식의 시청각적 자극, 시각·언어적 아이덴티티와 제품 외관의 결합을 통한 인지적 강화, 전자매체에 의한 행동적 참여 유도를 통해 소비자들에게 제공하였다. 또한, 인적 요소를 활용한 정서적 유대감과 공동 브랜딩을 통한 책임감 공유로 감성, 관계 경험을 제공함으로써 강력한 브랜드 관계를 구축하였다. 이는 다양한 숏폼 동영상 콘텐츠 기반의 브랜딩 사례로 확장하여 전략적 브랜드 경험 디자인 요소들을 통한 브랜드 구축 전략에 유용한 접근 방법을 제시한다고 할 수 있을 것이다.

• 한국응급구조학회지
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• 제24권3호
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• pp.55-63
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• 2020

Purpose: This study aimed to establish effective training strategies and methods by comparing the effects of 360° virtual reality video and first-person video in non-face-to-face practical lectures. Methods: This crossover study, implemented May 18-31, 2020, included 27 participants. We compared 360° virtual reality video and first-person video. SPSS version 25.0 was used for statistical analysis. Results: The 360° virtual reality video had a higher score of experience recognition (p=.039), vividness (p=.045), presence (p=.000), fantasy factor (p=.000) than the first-person video, but no significant difference was indicated for satisfaction (p=.348) or interest (p=.441). Conclusion: 360° virtual reality video and first-person video can be used as training alternatives to achieve the standard educational objectives in non-face-to-face practical lectures.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권7호
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• pp.2513-2530
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• 2021

With the fast development of information and communication technologies, video streaming services and applications are increasing rapidly. However, the network condition is volatile. In order to provide users with better quality of service, it is necessary to develop an accurate and low-complexity model for Quality of Experience (QoE) prediction of time-varying video. Memory effects refer to the psychological influence factor of historical experience, which can be taken into account to improve the accuracy of QoE evaluation. In this paper, we design subjective experiments to explore the impact of Short-Term Memory (STM) on QoE. The experimental results show that the user's real-time QoE is influenced by the duration of previous viewing experience and the expectations generated by STM. Furthermore, we propose analytical models to determine the relationship between intrinsic video quality, expectation and real-time QoE. The proposed models have better performance for real-time QoE prediction when the video is transmitted in a fluctuate network. The models are capable of providing more accurate guidance for improving the quality of video streaming services.

• 한국멀티미디어학회논문지
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• 제19권2호
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• pp.520-529
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• 2016

Recent use of digital video contents increases visual fatigue of users. As a result, it has been difficult that the existing video methods make users focus on the content with interest and deliver stories intended by contents producers. Parallax scrolling is getting the spotlight as a new way which are keeping the fluent visual advantages of video and help users maintaining their attention with simple maneuver. In this study, based on a survey, it would compare the user experience in an existing video in Web contents and parallax scrolling Web contents. As a result, it showed that using the parallax scrolling Web sites improve user sensibilities such as aesthetic, novelty and pleasure of user experiences. A remarkable thing is that users replied parallax scrolling is not much comfortable to use. According to the result, researchers suggest that using parallax scrolling in Web site needs thoughtful decision in making and managing of Web contents.