• Convergence Security Journal
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• v.23 no.5
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• pp.21-27
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• 2023

In the cloud computing environment, servers and applications can be set up within minutes, and recovery in case of fail ures has also become easier. Particularly, using virtual servers in the cloud is not only convenient but also cost-effective compared to the traditional approach of setting up physical servers just for temporary services. However, most of the und erlying networks and security systems that serve as the foundation for such servers and applications are primarily hardwa re-based, posing challenges when it comes to implementing cloud virtualization. Even within the cloud, there is a growing need for virtualization-based security and protection measures for elements like networks and security infrastructure. This paper discusses research on enhancing the security of cloud networks using network virtualization technology. I configured a secure network by leveraging virtualization technology, creating virtual servers and networks to provide various security benefits. Link virtualization and router virtualization were implemented to enhance security, utilizing the capabilities of virt ualization technology. The application of virtual firewall functionality to the configured network allowed for the isolation of the network. It is expected that based on these results, there will be a contribution towards overcoming security vulnerabil ities in the virtualized environment and proposing a management strategy for establishing a secure network.

• Journal of Engineering Education Research
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• v.6 no.1
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• pp.56-64
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• 2003

In this paper, we designed and implemented a client/server distributed environment and developed a web-based virtual laboratory system for electronic circuits. Since our virtual laboratory system is implemented to describe the on-campus laboratory, the learners can obtain similar experimental data through it. The proposed virtual laboratory system is composed of four important components : Principle Classroom, Virtual Experiment Classroom, Evaluation Classroom and Overall Management System. Through our virtual laboratory, the learners will be capable of learning the concepts and theories related to electronic circuit experiments and how to operate the experimental equipments such as multimeters, function generators, digital oscilloscopes and DC power supplies. Also, every experimental activity occurred in our virtual laboratory is recorded on database and printed out on the preliminary report form. All of these can be achieved by the aid of the Management System. The database connectivity on the web is made by PHP and the virtual labol'atory environment is set up slightly differently for each learner. Finally, we have obtained several affirmative effects such as reducing the total experimental hours and the damage rate for experimental equipments and increasing learning efficiencies as well as faculty productivity.

• Journal of The Korean Association of Information Education
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• v.9 no.2
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• pp.243-254
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• 2005

Along the information technology progresses, the demand for the educational application increases which derives the need for cyber education. Cyber education should take the knowledge construction model rather than the knowledge delivery model. For the educational paradigm shift by cyber education, 'Project-Based Learning' and 'Cyber Learning Community' need to be adopted. In this study, project-based cyber learning community for teacher education is developed with 5 major categories: Home(community vision, general information, project list, Q&A), project learning center(preparation for the instructional activities, group-based learning activities, presentations), meeting plaza(request for group mentoring, sharing ideas, meeting specialist, survey participating, forum participating, result presentation), references(cases of project studies, materials for project studies, materials for teacher education, general materials), management(project management, project cases, idea bank, finding partners, dialog with instructors, sharing references, sharing experiences, survey, forum).

• Journal of Engineering Education Research
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• v.4 no.1
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• pp.20-25
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• 2001

This paper presents the practical implementation methodology of a web-based Virtual Laboratory in the field of electrical and electronic engineering, in which efficient self-learning can be available due to high interactivities between a teacher and a learner. Now that the proposed Virtual Laboratory is composed of 3 learning classrooms and their management system, the learners can understand easily the several important electrical concepts and make an experiment in the cyberspace through simple mouse manipulations. The results of this research are to allow the implementation of an efficient Virtual Laboratory system, and are also expected to make a contribution to the activation of educational system in cyberspace.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.05a
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• pp.428-429
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• 2022

최근에 자율 주행 자동차에 관련한 관심이 증가하면서 다양한 연구들이 도출되고 있다. 특히, 자율 주행 자동차를 시뮬레이터에서 검증하는 방법은 실 환경과 비교할 때 상대적으로 안전한 성능 검증 방법으로 많이 활용되고 있다. 시뮬레이터의 핵심 기술은 실 환경과 가상 시뮬레이션 환경의 차이를 줄이는 데 있다. 본 논문에서는 Generative Adversarial Imitation Learning(GAIL)[1] 기반으로 자율 주행 자동차 시뮬레이터 내에서 다수의 가상 동적 객체들의 움직임을 제어하는 방법을 제안한다. GAIL은 생성기와 판별기로 구성된다. 생성기는 강화학습 정책 생성기와 전문가 정책 생성기를 포함한다. 판별기는 보상 학습기를 포함한다. GAIL 기반으로 가상 자동차 및 가상 보행자를 제어함으로써 동영상에서의 이동경로를 학습해서 표현할 수 있다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.39 no.7
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• pp.660-665
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• 2011

Reconfigurable Flight Simulator for an airborne tactical mission based on virtual reality technology is developed as a software configurable cockpit with computer display as virtual instruments. It can simulate F-15K, KF-16, T/A-50 class fighter and depending on simulated cockpit, control stick and throttle are replaceable. For effective immersion, Video See-Through type HMD is applied.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.245-248
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• 2013

본 논문에서는 현대사회의 복잡성으로 인해 각자 흩어져 살고 있는 가족 구성원들을 메타버스 기반의 가상공간을 통해 서로 연결시켜주어 가족애를 증진시켜주고 특히 안전에 취약한 타지에 살고 있는 노부모를 가상공간을 통해 모니터링하여 신속한 대응을 할 수 있도록 홈가상화 서비스를 위한 물리홈 안전센서와 제어장치를 제안한다. 홈가상화를 통한 홈안전시스템은 메타버스 서버와 클라이언트, 홈가상 플랫폼 게이트웨이와 물리홈 센서와 제어장치로 구성되며, 본 논문에서는 하부구조인 홈가상 플랫폼 게이트웨이와 센서 및 제어장치간의 프로토콜 및 이의 프로토타입을 구성하도록 한다. 이를 통해 가상 공간에서 실공간의 홈센서 및 제어장치와 교신할 수 있어 가상공간을 통한 홈안전서비스를 구현할 수 있다.

• Information and Communications Magazine
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• v.32 no.7
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• pp.34-39
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• 2015

본고에서는 최근 활발하게 연구되고 있는 네트워크 가상화 기술인 NFV(Network Functions Virtualization)과 오픈 플랫폼 개발 프로젝트인 OPNFV에 대해 소개한다. 또한 가상화 기반의 이동통신망 구조인 vEPC 구현을 위한 요구사항 및 관련 연구들을 소개하고, 실 구현된 vEPC 테스트베드를 소개한다.

• Journal of Engineering Education Research
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• v.5 no.1
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• pp.27-33
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• 2002

Recently, according to the appearance of various virtual websites using multimedia technologies, the internet applications in engineering education have drawn muchinterests. But unidirectional communication, simple text/image-based webpages and tedious learning process without motivation, etc. have made the lowering of educational efficiency in cyberspace. This paper presents a virtual laboratory system which can be creating efficiencies in the learning process. The proposed virtual laboratory system for digital logic circuits provides interactive learning environment under which the multimedia capabilities of world-wide web can be enhanced. The virtual laboratory system is implemented to describe the on-campus laboratory, the learners can obtain similar experimental data through it. The virtual laboratory system is composed of four important components : principle classroom, simulation classroom, virtual experiment classroom and management system. Learning efficiencies as well as faculty productivity are increased in this innovative teaching and learning environment.

• Journal of Engineering Education Research
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• v.5 no.1
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• pp.19-26
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• 2002

This paper presents a virtual laboratory system which can be creating efficiencies in the learning process. The proposed virtual laboratory system for electrical circuits provides interactive learning environment under which the multimedia capabilities of world-wide web can be enhanced. The virtual laboratory system is implemented to describe the on-campus laboratory, the learners can obtain similar experimental data through it. In the proposed virtual laboratory system, every activity occurred in the virtual laboratory will be recorded on database and printed it out on the preliminary report form. The database connectivity is made by PHP and the virtual laboratory environment is set up slightly differently for each learner The virtual laboratory system is composed of four important components : Principle classroom, Simulation classroom, Virtual experiment classroom and Management system. Learning efficiencies as well as faculty productivity are increased in this innovative teaching and learning environment.