• Journal of the Korean Geographical Society
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• v.32 no.4
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• pp.543-548
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• 1997

New technologie of information and interaction create ambiguous, multifaceted relationships between concepts and realities that once seemed clear and simple. The acvent of cyberspace implies the existence of cyberplaces and relationships among cyberspace and places that could be as or more complex then those that exist among the spaces and places of the non-digital world. Virtual reality-the current uses of infomation technologies to create replicas of places and processes in the world-offers a point of exploring such relationships. But more penetrating insights become evident in the examination of real virtuality-the uses of information technologies to enhance the experience of places in the world. Real virtuality offers geographers a variety of innovative and powerful tools for augmenting the effectiveness and domain of their craft. Widespread use of real virtuality by geograpgers will alter their use of data, methods, and theory in research, teaching, and practice.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.10
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• pp.1101-1108
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• 2015

In this paper, to provide a method and system for providing a network separation virtual machine environment. How to provide this virtual machine environment include phase generating necessary virtual resource requirement for the perform of virtual function and transfer to network changing protocol about request of registration virtual resource. For this reason, Registration procedure is to use a virtual machine for a virtual computing resource allocation and separation combined network any time, it became possible between servers and clients, or mobile phone. At any time, it is possible to process the work in the same environment as in a computer to access the Internet.

• Journal of Digital Contents Society
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• v.11 no.3
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• pp.299-306
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• 2010

According to development of Internet and computer graphics technology, Digital fashion technology makes virtual fitting service capable by reappearing of clothes in 3D. In this paper, We suggest that combined solution which you could use virtual fitting service with various device. For example, imaginary mirror(such as digital information display), pc, mobile in different situations such as store, internet shopping market, commercial. Users can experience imaginary mirror that is located in store or 3D virtual fitting service for digital fashion in internet shopping market, mobile application. In addition, We proposed the solution that user can send experienced virtual fitting service results to other person by image file form of MMS.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.310-314
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• 2009

In this paper we propose the U-VR Simulator which seamlessly connects entities in real and virtual environments by exploiting context, based on the concept of ubiquitous virtual reality. Using the U-VR Simulator, a smart home environment can be simulated and new virtual entities such as sensors, actuators, and services can be added to existing real entities. The proposed approach is fast and cost-effective because the simulator effectively utilizes both existing and simulated devices. In addition, our approach allows application developers to rapidly develop U-VR applications and extend them to relevant domains. As a future work, we will expand our simulator to intelligently augment virtual entities into real environments.

• The Journal of the Korea Contents Association
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• v.9 no.1
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• pp.177-186
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• 2009

Virtual world is persistent 3D(2D) space through computers which supports real-time interaction. Children's virtual worlds are for children below 15. Its educational benefits are: practical experience, cooperation possibility, experience sharing, and optimized environment. Moreover, interesting factors from games can enhance the educational efficiency of virtual worlds. In order to intensify the educational efficiency, goal, motivation, relationship and advice has to be considered as well. Based upon those factors, the result of analysis of current virtual worlds shows that they have clear goal. contextualization of task and appropriate reinforcement. However, for future prosperity, continuous effort for expansion of readiness, social persuasion, scaffolding are needed.

• Journal of Korea Multimedia Society
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• v.3 no.1
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• pp.14-22
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• 2000

We have designed and implemented an educational system based on the distributed virtual environment. The developed system has a client-server architecture: the platform-independent server is implementes by Java machine and the client is composed of VRML, EAI, and general web browser. If a change occurs in this virtual environment, all connected users can perceive the updated environment immediately. the system maintains its virtual environment after it is modified by a user. Also, the system can accommodate many users by minimizing the information exchange. Since users can share multimedia information and virtual objects by overcoming the limitation of time and space, the educational effects can be progressed through the use of the developed system.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.6
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• pp.595-601
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• 2010

Desktop virtualization technology running on the local computing system in the process of resource depletion or degradation, such as upgrading the system to solve problems and manage critical information and systems must be protected. In addition, a virtualized environment by constructing a convenient stand-virtualized infrastructure and user space, and security from external attack or internal flaw or a problem, even if the service fails to respond quickly and should help to recover. In this paper, a comprehensive virtualization technology based on the client's desktop virtualization technology elements needed to find a local computing environment more comfortable and stable in the proposed new virtualization technologies.

• Nuclear Engineering and Technology
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• v.28 no.2
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• pp.206-215
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• 1996

원자로냉각재계통 기기 설계를 위한 구조해석 분야는 크게 세가지로 구분할 수 있는데, 첫번째는 원자로 냉각재계통내의 유체의 온도, 압력, 원자로냉각재계통 기기 및 유체의 자중 등을 고려하여 정적해석이 주가되는 정상운전해석, 두번째는 원자력 발전소 수명내에 부지에 발생 가능한 지진을 고려하는 내진설계를 위한 지진해석, 세번째는 원자력발전소를 다른 플랜트보다 한층 안전하게 설계할 수 있도록 원자력 발전소내의 모든 고에너지배관의 파단을 가상하는 가상배관파단해석으로 구분할 수 있다. 1986년 이전까지의 가압경수로발전소의 가상배관파단은 원자로냉각재주배관의 파단을 가상하여 동적구조해석을 수행하므로써, 극히 보수적인 결과를 얻었다. 그러나, 파괴역학의 발전은 파단전누설기법을 정립하였으며, 이에 따라 1987년 미국의 10 CFR Part 50 Appendix A GDC 4에서는 원자력발전소 내의 모든 고에너지배관에 파단전누설기법 적용을 허용하므로써, 이들 배관의 가상배관파단을 배제할 수 있도록 하였다. 한국형 표준원전인 울진원자력 3, 4호기의 참조발전소인 영광원자력 3, 4호기는 개정된 GDC 4를 적용한 최초의 가압경수로발전소로서, 원자로냉각재주배관과 12인치 이상의 일차측 분기관들의 가상배관파단을 배제하였다. 본 보고서에서는 영광원자력 3, 4호기의 참조발전소인 미국 Palo Verde발전소와 한국형 표준원전인 울진원자력 3, 4호기의 가상배관파단에 의한 원자로냉각재계통의 동적구조해석 결과를 서로 비교, 분석하므로써 개정된 GDC 4의 영향을 평가함은 물론 향후 분기관 가상배관파단해석의 방향을 모색하는데 있다.

• KIISE Transactions on Computing Practices
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• v.20 no.10
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• pp.555-560
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• 2014

This paper proposes the data security technology for the desktop virtualization environment using the separated software execution method. In the virtual environment where allocates separate VMs to the users, there is a benefit that the programs in one guest machine are isolated from the programs running in another guest machine, whereas in the separated execution environment that supports application virtualization, the isolation is not offered and it causes the data security problem because the applications are executed by the one root privilege in the server. To solve this problem, we provides the data security method using the server storage filter, the viewer filter, and the file mapping table in this paper.

• Proceedings of the Korea Society for Simulation Conference
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• 1999.04a
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• pp.65-69
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• 1999

Switching System(이하 교환 시스템)이 QoS(Quality of Service)를 유지하면서 처리 가능한 최대 동시 호처리 능력을 검증하기 위하여, 수학적 분석을 이용한 해석적 방법, 실제 호를 사용한 통계적 방법 등이 제안되었다. 해석적 방법을 이용해 산출한 교환 시스템의 최번시 동시 호 처리능력(BHCA, Busy Hour Call Attempt)은 단지 수학적인 예측일 뿐이므로 이를 검증하기 위해서 가상 호 발생기가 제안되었다. 이 가상호 발생기는 가입자의 행동을 시스템 하위 프로세서(가입자 정합 Device 제어 프로세서)에서 Simulation하여 가상의 호를 발생시키고, 이를 통해 교환기 최대 동시 호 처리 용량을 시험하기 위한 SW이다. 이 가상호 발생기는 동일한 형태의 호를 동시에 다량으로 발생시킴으로써 교환 시스템의 주 프로세서(Main Processor, MP)의 동시 호 처리 용량을 시험하기 위한 SW이다. ITU-T 권고에 의하면 시스템부하가 90~95%를 넘어 서는 경우는 예외적인 처리(과부하 제어 등)를 권고하고 있으므로 MP 부하 90~95%에서 BHCA를 계산하면 최대 호 처리 용량이라 할 수 있다. 가상 호 발생기는 시스템 개발 초기에 실제 가입자 정합 Device 와 호 발생기 없이도 MP 과부하 지점까지 호를 발생시킴으로써 개발의 시간 및 비용을 절약할 수 있도록 하고, 계획된 시스템 용량을 만족하기 위해 필요한 조치를 교환 시스템 개발 초기에 취할수 있도록 한다. 또한, 과부하 지점에서 MP가 정상 동작하는지 검증하는 도구로 사용 가능하다. 앞으로 이를 더 발전시키면 가상호 발생기를 이용한 다양한 시스템 검증 및 분석에 이용할 수 있을 것이다. 본 논문은 가상호 발생기의 구조와 최대 용량 시험 방법을 소개하고, 더 나아가 호 Traffic에 대한 최대 용량 시험뿐 아니라 QoS를 향상시키기 위한 교환 시스템의 제반 성능 시험 및 분석에 이를 이용하기 위해 개선이 필요함을 서술하고자 한다.