• Proceedings of the Korea Information Processing Society Conference
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• 2003.05a
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• pp.63-66
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• 2003

실시간 멀티미디어의 전송시 네트워크의 상황에 따라서 서비스의 품질이 급변하게 된다. 이 경우 QoS를 보장하기 위해서 일반적으로 피드백에 의한 제어방법을 사용하게 된다 본 논문에서는 UDP 패킷 전송실험을 통하여 실시간 멀티미디어 전송에서의 QoS를 보장하기 위한 피드백 정보의 이용가능성에 대해 살펴보고 실험 데이터를 여러 가지 각도로 분석해보았다. 피드백 정보의 문제점을 살펴보고 개선방안을 제시하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.495-496
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• 2018

전문대학의 프로그래밍 수업에서 시험효과를 이용하여 학습자의 집중도를 높이고 긴장감을 유발하며 학업 성취도를 높일 수 있는 실시간 학업성취도 테스트와 피드백 방안을 제안한다. SNS와 간단한 필기구를 활용한 시험으로 교수자는 수업 전과 후의 학습자의 성취도의 변화를 쉽게 파악하며 학습자는 실시간으로 SNS를 통해 피드백을 받을 수 있다.

• Journal of KIISE:Information Networking
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• v.27 no.1
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• pp.58-67
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• 2000

The paper presents a representative-based feedback mechanism and rate adaptation policy for congestion control in multicast traffic for multimedia applications. In multicast congestion control, feedback implosion occurs as many receivers send feedback to a sender. We propose to use representatives to avoid the feedback implosion. In our scheme, receivers feedback packet loss information periodically and a sender adapts the sending rate based on the information collected through a hierarchy of representatives. A representative is selected in each region and roles as a filter to decrease the number of feedbacks. The simulation results show that the proposed scheme solves the feedback implosion problem and well adapts in a congested situation.

• KIPS Transactions on Software and Data Engineering
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• v.6 no.7
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• pp.361-370
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• 2017

This paper proposes the architecture of test case generator that can generate test cases, considering feedback signals from subsystems controlled by an embedded system. In general, a closed system decides the next test input to its subsystem under its control referencing feedback signals from its subsystem. In such systems, it is hard to use the typical test cases generated without referencing feedback. The architecture proposed in this paper re-produces test cases in real time using feedback signals. The architecture is implemented and its effectiveness is verified through experimenting a demo system.

• The KIPS Transactions:PartA
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• v.10A no.6
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• pp.615-626
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• 2003

This paper proposes a mechanism for managing overload Introduced by excessive web requests in real-time web service system. The many previous mechanisms statically manage the overload and thus the dynamic characteristics are not reflected. This paper proposes a mechanism that models system load based on control theory approach and includes its dynamic characteristics. We design a controller that is able to meet performance requirement. A feedback control system is implemented applying the proposed mechanism and the stable operation of system is verified through various simulation environments.

• The Journal of Korean Association of Computer Education
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• v.14 no.5
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• pp.71-79
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• 2011

We designed and implemented a cooperative learning system using social network service which can be utilized on a smart phone for users to read each other's posting once they upload posting and to give feedback concerning the posting in real time without the need for accessing a relevant website, through the installation of a necessary application which makes it possible for learners to interact at any time in any place on a smart phone. The developed program is used as an intermediate tool for real-time communications so as to aid in solving the task of learners, and it was made to boost academic achievement as well as interest in learning through real-time interactions and feedback. Furthermore, the program was designed in such a way that an instructor actually helps learners by closely identifying their levels based on accumulated data.

• Journal of the Korea Convergence Society
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• v.1 no.1
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• pp.17-21
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• 2010

This paper proposes a mechanism for managing overload in real-time web service system. The many previous mechanisms manage overload with controlling web request. These mechanisms can control only new web request. They don't have any control existing tasks, especially periodic tasks. We design a controller that able to meet real-time performance with controlling even periodic tasks. A feedback control system is implemented applying the proposed mechanism. And we verified the stable operation of system.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.681-682
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• 2023

비실시간 온라인 수업은 학습자가 원하는 시간에 학습을 할 수 있고, 공간의 제약이 없다는 장점이 있다. 그러나 실시간으로 이루어지는 수업이 아니다 보니 수업 콘텐츠에 문제가 있거나, 설명이 부족한 부분에 대한 학습자들의 의견이 교수자에게 전달하는 것에 한계점이 존재한다. 본 논문에서는 수업 콘텐츠를 듣는 학습자들의 피드백 정보를 교수자에게 전달하는 시스템을 제안한다. 학습자에게는 온라인 녹화 수업 콘텐츠를 정지했을 시 정지 사유를 조사하고, 정지 사유와 정지한 콘텐츠의 시간 정보를 교수자에게 전달할 수 있고, 교수자에게는 학습자들의 온라인 녹화 수업 영상의 피드백 정보와 정지시간을 교수자에게 그래프로 나타내어 한눈에 수업 콘텐츠의 문제점이 많은 부분을 파악할 수 있게 해서 전달한다. 교수자는 피드백을 반영해 콘텐츠를 재업로드하여 질 높은 수업 콘텐츠로 인해 학습자들은 학업 성취도를 높일 수 있을 것이다.

• Journal of Korean Elementary Science Education
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• v.24 no.2
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• pp.111-122
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• 2005

The goal of this study was to investigate the differences in the effect of feedback from different providers on elementary school students' science achievement and to examine the responses of the students regarding the feedback. Three 6th grade classes were chosen to be assigned as experimental group 1, experimental group 2, and control group, respectively. In experimental group 1, the teacher provided feedback with students concerning the formative evaluations which were conducted periodically. Experimental group 2 was the one in which students were organized into small groups to compose and exchange feedback with one another. No feedback was of offered to students in the control group. The results of the science achievement test indicated ,that the provision of feedback by the teacher resulted in more gains in student academic achievement. The interviews with students revealed that the learners made positive responses to the feedback provided by the teacher while they showed negative attitudes toward the feedback exchange among students. There were also differences in student responses to feedback between high and low achievers in science. Implications for science lessons and science education research were presented and discussed.

• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.2
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• pp.21-32
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• 2013

This is a preliminary study for the real-time feedback vibration control of building structures. The study developed a wireless acceleration sensor system based on authentic technology capacities, to integrate with the Prototype AMD system and ultimately construct the feedback vibration control system. These systems were used to evaluate the basic performance levels of the control systems within model building structures. For this purpose, the study first developed a wireless acceleration sensor unit that integrates an MEMS sensor device and bluetooth communication module. Also, the study developed an operating program that enables control output based on real-time acceleration response measurement and control law. Furthermore, the Prototype AMD and motor driver system were constructed to be maneuvered by the AC servo-motor. Eventually, all these compositions were used to evaluate the real-time feedback vibration control system of a 2-story model building, and qualitatively measure the extent of vibrational reduction of the target structure within the laboratory validation tests. As a result of the tests, there was a definite vibrational reduction effect within the laboratory validation tests. As a result of the tests, there was a definite vibrational reduction effect within 1st and 2nd resonance frequency as well as the random frequency of the model building structure. Ultimately, this study confirmed the potential of its wireless acceleration sensor system and AMD system as an effective tool that can be applied to the active vibration control of other structures.