• Educational Technology International
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• 제25권1호
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• pp.1-25
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• 2024

This study aims to analyze the impact of learners' usability perceptions of topic modeling-based visual feedback and generative AI interpretation on reflection levels in online discussions. To achieve this, we asked 17 students in the Department of Korean language education to conduct an online discussion. Text data generated from online discussions were analyzed using LDA topic modeling to extract five clusters of related words, or topics. These topics were then visualized in a network format, and interpretive feedback was constructed through generative AI. The feedback was presented on a website and rated highly for usability, with learners valuing its information usefulness. Furthermore, an analysis using the non-parametric Mann-Whitney U test based on levels of usability perception revealed that the group with higher perceived usability demonstrated higher levels of reflection. This suggests that well-designed and user-friendly visual feedback can significantly promote deeper reflection and engagement in online discussions. The integration of topic modeling and generative AI can enhance visual feedback in online discussions, reinforcing the efficacy of such feedback in learning. The research highlights the educational significance of these design strategies and clears a path for innovation.

• 한국경영과학회지
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• 제32권2호
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• pp.53-69
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• 2007

Internet shopping websites have offered comfort to consumers in shopping and built trust relationships with them by providing electronic agents for recommendation, escrow services, and customer centers etc. But as there is little big difference among the shopping websites in terms of technical competence, website design, operational policy, they recognize online feedback (reviews or recommendation of consumers or experts) and online feedback mechanism as important marketing tools. Based on online feedback related studies, this study explores antecedents (consensus, vividness of reviews, interactions in review boards) of the perceived effectiveness of review boards which are text-based feedback mechanisms and its consequences such as trust, satisfaction, and intention to use. The results show that the perceived effectiveness of review boards is significantly affected by vividness of reviews and interactions in review boards, and the impact of interaction in review boards on the perceived effectiveness of review boards is stronger than that of vividness of reviews. The results also show that the perceived effectiveness of review boards has a significant influence on trust and satisfaction with the shopping websites, and intention to use is influenced by both trust and satisfaction.

• 전기학회논문지
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• 제59권5호
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• pp.1001-1004
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• 2010

Acoustic feedback and background noise variation can degrade the performance of an active noise control (ANC) system. In this paper, nonlinear ANC using a non-parametric VSS-NLMS (or NPVSS-NLMS) algorithm and online feedback path modeling is proposed, whereby the conventional linear ANC with online acoustic feedback-path modeling is further extended to nonlinear Volterra ANC with a linear acoustic feedback path. In particular, the step-size of the NPVSS-NLMS algorithm is controlled to reduce the effect of background noise variation in the ANC system. Simulation results demonstrate that the proposed approach yields better nonlinear ANC performance compared with the conventional nonlinear ANC method.

• International Journal of Internet, Broadcasting and Communication
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• 제13권4호
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• pp.22-29
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• 2021

This study evaluates the accuracy of corrective feedback from Grammarly, an online grammar checker, on essays written by cyber university learners in terms of detected errors, suggested replacement forms, and false alarms.The results indicate that Grammarly has a high overall error detection rate of over 65%, being particularly strong at catching errors related to articles and prepositions. In addition, on the detected errors, Grammarly mostly provide accurate replacement forms and very rarely make false alarms. These findings suggest that Grammarly has high potential as a useful educational tool to complement the drawbacks of teacher feedback and to help learnersimprove grammatical accuracy in their written work. However, it is still premature to conclude that Grammarly can completely replace teacher feedback because it has the possibility (approximately 35%) of failing to detect errors and the limitationsin detecting errors in certain categories. Since the feedback from Grammarly is not entirely reliable, caution should be taken for successful integration of Grammarly in English writing classes. Teachers should make judicious decisions on when and how to use Grammarly, based on a keen awareness of Grammarly's strengths and limitations.

• 공학교육연구
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• 제13권6호
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• pp.24-32
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• 2010

본 연구의 목적은 온라인 토론 환경에서 교수자의 사회적 메시지를 통한 피드백 형태가 토론 참여도와 만족도에 미치는 효과를 살펴보는 것이다. 본 연구의 결과 분석을 통해 도출된 결론은 다음과 같다. 온라인 토론 환경에서 교수자의 상호작용적 형태의 사회적 메시지를 통한 피드백이 정의적 형태보다 학습자의 토론 참여도 및 만족도를 더 증진시키는 것으로 나타났다. 이상의 연구결과를 통해, 온라인 토론 환경에서 토론 참여도와 만족도의 향상을 위해 교수자의 사회적 메시지를 통한 피드백 형태의 적절한 활용을 제안한다.

• 공학교육연구
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• 제25권5호
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• pp.94-103
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• 2022

In this study, we examined the cases of online video classes conducted under the COVID-19 situation for 46 first-year students majoring in electrical engineering at a 3-year college in Gyeongnam. The research was carried out according to the course development process so that classes could be conducted efficiently, focusing on electromagnetism(1) course in the second semester of the first year. The online class consisted of uploading PPT recorded videos and lecture materials to the LMS and giving assignments. The contents of the study were in the scope of examining learners' perceptions through online learning contents, assignment submission, mutual feedback between instructors and learners, university-level lecture evaluation, and free opinions on online video-based electromagnetism(1) classes. As a result of the study, it was confirmed that online lecture review and problem-solving are particularly important for understanding lecture materials, and also given the nature of engineering subjects that require plenty of mathematical expressions, the detailed and immediate feedback provided by instructor enhances learners' class satisfaction and understanding. Based on these, the direction of online classes to be developed after the COVID-19 pandemic and teaching and learning methods suitable for the characteristics of subjects were discussed.

• 한국과학교육학회지
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• 제42권5호
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• pp.501-514
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• 2022

온라인 교수학습 환경으로의 변화에 따라 온라인 형성평가에 대한 관심이 높아지고 있으며, 이에 대한 예비 교사들의 준비가 필요하다. 본 연구에서는 교사 교육의 기초 토대 마련을 위해 예비 과학교사 22명을 대상으로 온라인 수업과 온라인 형성평가, 형성평가에 대한 인식을 조사하고, 이를 바탕으로 실행 과정에서 나타나는 주요 사항을 분석하였다. 사전 인식은 개방형 설문을 통해 얻은 응답을 오픈 코딩을 통해 범주화하여 범주별 빈도를 파악하였고, 사전 인식의 범주 분류 결과를 바탕으로 실행의 모습을 분석하였다. 이를 통해 현재 상태와 바람직한 활용 목표 간의 격차를 파악하고, 교사 교육에서 중점을 두어야 하는 사항은 무엇인지에 대해 논의하였다. 연구의 결과, 사전 인식에서는 온라인 수업의 어려움으로 상호작용을 언급하고, 온라인 형성평가의 장점으로 테크놀로지의 활용 및 피드백과 수업 조정을 언급하였다. 지도안과 조별 사전 인식 과정에서는 플랫폼의 테크놀로지를 활용하여 자동화된 피드백을 대부분 활용하였지만, 응답 분석 결과를 활용한 수업 조정과 상호작용이 나타나지는 않았다. 또한 온라인 형성평가의 형성적 기능에 적합하지 않은 활용 방식이 다수 나타났다. 이러한 원인은 예비 교사들의 형성평가 활용에 대한 이해가 부족하고, '평가'의 측면에 치중했기 때문으로 분석된다. 형성평가의 피드백을 통한 '형성적' 기능과 활용 방법에 대한 예비 교사들의 충분한 이해가 바탕이 될 때, 온라인 형성평가의 장점을 활용한 상호작용으로 이어질 수 있다. 따라서 형성평가의 핵심적 기능이 잘 발휘될 수 있도록 형성적 활용에 대한 역량 강화와 실질적 적용 방법에 대한 교육이 예비 교사 교육에서 강조되어야 할 것이다.

• International Journal of Advanced Culture Technology
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• 제9권1호
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• pp.162-167
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• 2021

The aim of this paper is to analyze the development of effective online Problem-Based Learning (PBL) and Project-Based Learning (PjBL). The collaborative PBL/PjBL become one of the hot issues with the rapid growth of online learning in the era of COVID-19. Educators try to get innovative to continue instruction without sacrificing student engagement, thus adopting an instructional model of PBL/PjBL. The PBL process involves clarifying terms, defining complex problems, brainstorming, structuring and hypothesis while PjBL includes project-planning, implementation, communicating the results of a project in a presentation and evaluations with immediate individually tailored feedback within a predetermined period. Despite the differences between online and offline learning, the benefits of learning online or offline are practically the same if enough bidirectional interactions between instructors and students are possible. We argue that online qualifications are just the same as those of offline ones in PBL/PjBL models, therefore, the standards of online/offline learning are identical since education is a two-way communication.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.330-333
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• 2005

In this study, a method of designing a neurointerface using neural network (NN) is proposed for controlling nonholonomic mobile robots. According to the concept of virtual master-slave robots, in particular, a partially stable inverse dynamic model of the master robot is acquired online through the NN by applying a feedback-error learning method, in which the feedback controller is assumed to be based on a PD compensator for such a nonholonomic robot. A tracking control problem is demonstrated by some simulations for a nonholonomic mobile robot with two-independent driving wheels.

• 한국경영과학회지
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• 제38권1호
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• pp.29-44
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• 2013

This study suggests that as receiving feedback is moved back, the effectiveness of problem-solving increases. Utilizing data from innovation contests in which a number of problem solvers compete with each other, we answer questions such as whether the order of receiving first feedback affects problem-solving effectiveness and how problem-solving experience moderates the relationship between the first feedback order and problem-solving effectiveness. Empirical results based on data collected from Kaggle, an online platform for innovation contests, showed that the order that contest participants receive the first feedback increases problem-solving effectiveness. Furthermore, the more prior experience of contest participants accentuates the suggested relationship between the order of receiving the first feedback and problem-solving effectiveness.