• 한국간호교육학회지
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• 제25권2호
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• pp.186-196
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• 2019

Purpose: This study was conducted to identify types of peer feedback in nursing skills performance training and to investigate emotional response, perceived quality of feedback and self-efficacy for learning from peer feedback. Methods: A total of 110 second-year nursing students attending fundamentals of nursing classes at a university participated in 2017. Participants received peer feedback from one selected colleague who observed their skills performance, and completed a questionnaire. Contents of peer feedback video recordings were transcribed and classified into seven types of feedback. Data were analyzed using an independent t-test, ANOVA and Pearson correlation. Results: Participants mostly received feedback of 'correcting' and 'providing information.' Positive emotional responses from peer feedback were above medium, and negative emotional responses were low. The perceived quality of peer feedback was moderate and self-efficacy for learning was high. Quality of feedback correlated with negative emotional response (r=-.24, p=.014), and self-efficacy for learning (r=.35, p<.001). Self-efficacy for learning correlated with intimacy with peers (r=.24, p=.011) and positive emotional response (r=.21, p=.028). Conclusion: The results suggest that peer feedback in skill training could be used in terms of emotional response and self-efficacy for learning.

• 한국지능시스템학회논문지
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• 제24권3호
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• pp.316-322
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• 2014

본 논문은 TV를 이용한 영화시청 환경에서 해당 컨텐트에 대한 시청자의 암묵적 반응과 컨텐트의 멀티모달 피쳐를 실시간으로 측정 및 동기화하여 이를 기반으로 동영상 선호모델을 지속적으로 개선하고 필요시 영화추천을 수행하는 시스템을 제안한다. 제안한 시스템에선 이미지, 소리, 자막 스트림으로부터 실시간 추출되는 저수준 피쳐들과 동기화되어 측정된 얼굴표정, 자세 및 생체신호로부터 해당 동영상이 유발한 시청자의 감정상태를 추정하여 선호모델 학습에 사용한다. 제안한 컨텐트-시청자 연계 추천모델의 일례로서 컨텐트의 오디오 및 자막 정보를 이용하여 시청자의 피부전기활성도로 측정된 arousal반응을 예측할 수 있음을 보인다.

• 한국어교육
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• 제29권2호
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• pp.181-208
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• 2018

The aim of this study is to design a Real-time video Korean curriculum. Curriculum using real-time video, which is a variant of distance learning, teaches Korean to students studying in distant places through real-time video communication program. This is expected to supplement the lack of interaction in existing video classes and enable online simultaneous interaction, while increasing learning opportunities for Korean language students living in distance places. To find out the needs of the subjects for the curriculum design, this study conducted a one-on-one interview with 9 female married immigrants who are enrolled in the Cyber University which is opening a curriculum later. According to the survey, the students answered that they have a high intention of attending classes if the lack of interaction in existing distance classes are supplemented. Therefore, we could confirm the demand of a curriculum consisting of an overall real-time video education and multilateral individual connection. Also, we found out that there is a demand in performance rather than comprehension and a high demand for detailed feedback from the teacher. The result shows that the curriculum needs to establish performance-oriented contents to progress to an advanced level Korean Language, and include a study plain comprising of real-time interaction.

• 지능정보연구
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• 제21권1호
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• pp.83-98
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• 2015

TV를 보면서 방송에 관련된 정보를 검색하려는 많은 시청자들은 정보 검색을 위해 주로 포털 사이트를 이용하고 있으며, 무분별한 정보 속에서 원하는 정보를 찾기 위해 많은 시간을 소비하고 있다. 이와 같은 문제를 해결하기 위한 연구로써, 인터랙티브 비디오에 대한 연구가 활발하게 진행되고 있다. 인터랙티브 비디오는 일반적인 비디오에 추가 정보를 갖는 클릭 가능한 객체, 영역, 또는 핫스팟을 동시에 제공하여 사용자와 상호작용이 가능한 비디오를 말한다. 클릭 가능한 객체를 제공하는 인터랙티브 비디오를 저작하기 위해서는 첫째, 증강 객체를 생성하고, 둘째, 어노테이터가 비디오 위에 클릭 가능한 객체의 영역과 객체가 등장할 시간을 지정하고, 셋째, 객체를 클릭할 때 사용자에게 제공할 추가 정보를 지정하는 과정을 인터랙티브 비디오 저작 도구를 이용하여 수행한다. 그러나 기존의 저작 도구를 이용하여 인터랙티브 비디오를 저작할 때, 객체의 영역과 등장할 시간을 지정하는데 많은 시간을 소비하고 있다. 본 논문에서는 이와 같은 문제를 해결하기 위해 유사한 샷들의 모임인 샷 시퀀스의 모든 샷에서 얼굴 영역을 검출한 샷 시퀀스 메타데이터 모델과 객체의 어노테이션 결과를 저장할 인터랙티브 오브젝트 메타데이터 모델, 그리고 어노테이션 후 발생될 수 있는 부정확한 객체의 위치 문제를 보완할 사용자 피드백 모델을 적용한 얼굴영역을 기반으로 하는 새로운 형태의 어노테이션 방법을 제안한다. 마지막으로 제안한 어노테이션 방법의 성능을 검증하기 위해서 인터랙티브 비디오 저작 시스템을 구현하여 기존의 저작도구들과 저작 시간을 비교하였고, 사용자 평가를 진행 하였다. 비교 분석 결과 평균 저작 시간이 다른 저작 도구에 비해 2배 감소하였고, 사용자 평가 결과 약 10% 더 유용한다고 평가 되었다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2007년도 추계학술발표대회
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• pp.966-969
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• 2007

In this paper, we propose a novel probing mechanism for adaptive transmission of video data based on congestion control and client state. The proposed mechanism is friendly to the network dominant transport protocols (TCP) and can reduce fluctuations compared to the previous works.

• Physical Therapy Rehabilitation Science
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• 제12권3호
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• pp.327-333
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• 2023

Objective: The purpose of this study was to investigate the effects of wearing an immediate vibration feedback device at the lumbar region on the spine angle in a sitting position. Design: Cross-sectional study. Methods: The subjects were 28 healthy university students who were randomized to three interventions. Each condition (A: in a normal chair with an immediate feedback device, B: on the gym ball, C: in a normal chair) spent 10 minutes watching the video, and the order of the experiments was randomized, and the measurements were taken consecutively. Results: The results showed significant differences in cervical and thoracic angles between conditions and time. Post hoc tests showed no difference at 1 minute, but significant differences at 5 and 10 minutes. Conclusions: In conclusion, all angles increased over time in all conditions, but the condition of wearing an immediate vibration feedback device with a lower increase was more useful in maintaining spinal angles than the other two conditions. This study suggests that immediate vibration feedback devices may be an alternative to prevent the loss of spinal angle in occupations and environments with prolonged sedentary postures, and further research is needed to investigate the effectiveness of prolonged application.

• Journal of Communications and Networks
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• 제4권3호
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• pp.221-229
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• 2002

Adaptability is the most promising feature to be applied in future robust multimedia applications. In this paper, we propose the Direct Algorithm to improve the degree of satisfaction at heterogeneous receivers in multi-layered multicast video environments. The algorithm relies on a mechanism that dynamically controls the rates of the video layers and is based on feedback control packets sent by the receivers. The algorithm also addresses scalability issues by implementing a merging procedure at intermediate nodes in order to avoid packet implosion at the source in the case of large multicast groups. The proposed scheme is optimized to achieve high global video quality and reduced bandwidth requirements. We also propose the Direct Algorithm with a virtual number of layers. The virtual layering scheme induces intermediate nodes to keep extra states of the multicast session, which reduces the video degradation for all the receivers. The results show that the proposed scheme leads to improved global video quality at heterogeneous receivers with no cost of extra bandwidth.

• Journal of Information Processing Systems
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• 제10권2호
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• pp.176-192
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• 2014

The realization of Wireless Multimedia Sensor Networks (WMSNs) has been fostered by the availability of low cost and low power CMOS devices. However, the transmission of bulk video data requires adequate bandwidth, which cannot be promised by single path communication on an intrinsically low resourced sensor network. Moreover, the distortion or artifacts in the video data and the adherence to delay threshold adds to the challenge. In this paper, we propose a two stage Quality of Service (QoS) guaranteeing scheme called Prioritized Multipath WMSN (PMW) for transmitting H.264 encoded video. Multipath selection based on QoS metrics is done in the first stage, while the second stage further prioritizes the paths for sending H.264 encoded video frames on the best available path. PMW uses two composite metrics that are comprised of hop-count, path energy, BER, and end-to-end delay. A color-coded assisted network maintenance and failure recovery scheme has also been proposed using (a) smart greedy mode, (b) walking back mode, and (c) path switchover. Moreover, feedback controlled adaptive video encoding can smartly tune the encoding parameters based on the perceived video quality. Computer simulation using OPNET validates that the proposed scheme significantly outperforms the conventional approaches on human eye perception and delay.

• 영어어문교육
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• 제9권2호
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• pp.1-16
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• 2003

This paper describes a video exchange project between English classes in South Korea and in Japan. Korean and Japanese students worked in groups to make short videos in English which were then exchanged. After viewing their counterparts' videos, students e-mailed feedback to each other. This project was the third video exchange project between Korean and Japanese university students since 2001. However, it was the first time to try it with three universities together. Students from the different universities tried to compete with each other. It provided a better chance for students to improve their English. Most students expressed the importance of the video exchange project in developing their English proficiency and enabling them to use English in an international context. Many students agreed that the project was an educational, enjoyable and worthwhile experience.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.84-86
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• 2006

An informed watermarking algorithm is proposed in this work that aids in concealing packet loss errors in video communications. This watermark-based error concealment(WEC) method embeds a low resolution version of the video frame inside itself as watermark data. At the receiver, the extracted watermark is used as a reference for error concealment. The proposed DCT-based algorithm has features of informed watermarking in order to minimize the distortion of the host frame. At the encoder, a predictive feedback loop Is employed which helps to adjusts the strength of the scale factor Furthermore, some of the modified coefficients of the DCT signal are virtually free from distortion by employing bit- sign adaptivity. The performance of the detector is Qualitatively analyzed for error concealment applications where full-frame DCT embedding proved to be more advantageous.