• KIISE Transactions on Computing Practices
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• v.22 no.9
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• pp.473-478
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• 2016

Server virtualization provides abstraction of physical resources to users and thus accomplishes high resource utilization and flexibility. However, the characteristics of server virtualization, such as the limited number of physical resources shared by virtual machines, can cause problems, mainly performance interference. The performance interference is caused by the fact that the CPU scheduler running on the host operating system schedules virtual machines without considering the characteristics of the virtual machine's internal process. To address performance interference, a number of research activities to improve performance interference have been conducted, but do not deal with the fundamental analysis of performance interference. In this paper, in order to analyze the cause of performance interference, we carry out profiling in a variety of scenarios in a virtualized environment based on KVM. As a result, we analyze the phenomenon of the performance interference in terms of CPU scheduling and propose an efficient scheduling solution.

• Journal of Digital Convergence
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• v.15 no.5
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• pp.373-380
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• 2017

Recently, virtual reality contents are being experimented and introduced in various fields such as game, education, medical, exhibition, movie, SNS. However, research on virtual reality is mainly focused on industrial and technological perspectives, so contents-centric or contents-oriented research is on virtual reality is very rare. In order to prepare for the future of virtual reality properly, content-oriented research is very much needed. The purpose of this study is to investigate the types, characteristics, and possibilities of virtual reality contents applied to theme parks. For this purpose, we tried to classify the contents type of virtual reality based theme park. The criteria of type classification are divided into 'fixed type', 'continuous moving type', and 'segmented moving type' according to the player's position movement possibility and movement type, here we combine the senses such as tactile, taste, smell, balance etc.

• The Journal of the Korea Contents Association
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• v.8 no.5
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• pp.123-133
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• 2008

This dissertation is a web-based cyber exhibition website and a clear difference between the general framework of the development breaks out, the cyber exhibition framework can be a model for the purpose of the proposal. The basic elements that comprise the exhibition model is archives layer, exhibit layer, and experience layer for the three-layer planed. In fact, the model has been applied throughout the analysis of cases with the application of the model presented, while others are considering goal direction also suggests the development of a cyber exhibition. If you take advantage of the cyber model of development brilliant display of the content rather than technology-driven 'material and value+media and CT' to the convergence of content through their own cyber exhibition area can expect to be recognized.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.10C
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• pp.981-990
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• 2006

In this paper, we introduce the concept of a subcarrier-based virtual multiple antennas (SV-MIMO) for OFDM cellular systems, where the multiple antenna techniques are performed on a set of subcarriers, not on the actual multiple antennas. The virtual multiple antenna system can support multiple users simultaneously as well as reduce inter-cell interference (ICI) form adjacent cells with a single antenna. Also, this technique is easily extended to multiple antenna environments. The virtual multiple antenna techniques can be divided into a virtual smart antenna technique and a virtual MIMO technique. Especially, this method effectively reduces ICI at cell boundary with frequency reuse factor equal to 1, and can support flexible resource allocation depending on the amount of interference. It is shown by simulation that the proposed method is superior to conventional method under the same condition of data transmission.

• 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 Internet Computing and Services
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• v.4 no.1
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• pp.27-37
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• 2003

This paper presents the Web service generation system using virtual environments and databases. Main features include that the environments and databases are generated and maintained correspondingly. It means that the virtual environments are changed automatically if the databases are updated, and also that the databases are maintained accordingly as the information about the environments are modified at the scene End users can modify the property of the virtual environments in the scene directly using the VRML edit interface, which visualizes the structures of virtual environments. Each object can be accessed through the VRML editor, its property be modified directly, and the information is updated in the database automatically. Web service pages are maintained accordingly. In addition, we define a texture mapping method based on weighted view interpolation using 2 photo images for a scene. A texture mapping interface Is also provided for end users to generate realistic images themselves.

• Journal of Biomedical Engineering Research
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• v.23 no.1
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• pp.73-79
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• 2002

The goals of this study are twofold: To investigate non-phobics'and Phobics'Physiological response in virtual environments. and to analyze the trend of phobics' Physiology during virtual reality treatment. As a measure of Physiology. heart rate, skin resistance. and skin temperature were acquired. The data of two group subjects were analyzed: twenty-two non-Phobic subjects (M=32.94 years). thirty-six subjects with fear of flying (M=40.12 yearn) who met the DSM-lV criteria for a fear of flying. As a result. skin resistance showed significant differences between non-Photics and phobics. T(56) =2.978, P〈0.01 And the physiological responses of 33 subjects among the Phobics. who succeed to fly without medicine after virtual reality treatment, showed a gradual trend toward the non-Phobics Physiological responses as therapy sessions went on. In this study. Physiological monitoring. skin resistance appeared to be useful both in understanding the Physiological state of Phobic individuals and in evaluating the results of treatment in virtual reality Psychotherapy.

• The Journal of the Korea Contents Association
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• v.12 no.6
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• pp.21-31
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• 2012

The virtual reality consists of a virtual space constructed similar to the reality and agents residing in it. Our virtual space refers to an orderly space that is governed by such physical properties as mass, gravity, friction, and associated rules on top of the usual visual rendering. To construct this virtual world we are to develop virtual agents behaving like humans and the environment surrounding them. In order to improve the existing reactive agents designed to act to their designers' dictation in predetermined space or memory into autonomous agents, we need diverse kinds of knowledge among others related to the spaces for the agents to act in. Our design and implementation focuses on the spatial knowledge among those diverse aspects of knowledge required. The developed knowledge representation scheme is used on a basis for realistic and efficient physical cyber-environment, and as the knowledge structure to simulate the virtual agents' knowledges on spaces.

• Cartoon and Animation Studies
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• s.41
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• pp.307-336
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• 2015

Virtual reality technology is one of the important technologies that will affect our life in many ways. This novel technology will draw new paradigm into the medical field due to its advantages in physical safety and environment that are fully controlled. Phobia treatment using VR technology has been implemented and its feasibility has been proved through a number of researches in many institutions. This study has observed the current progress of its technology environment and the trend of research. Also, This study has analyzed the results from domestic and international data. Analysis shows that other countries are ahead of korea in all aspects of the phobia treatment using virtual reality method. Although the authors limited the kinds of journals, the amount of quantity in international researches are two times more than domestics. Also, The researchers in other countries concentrate on the multi-modal studies. To use virtual reality in the phobia treatment, we need to understand the needs of the society members and the government has responsibility to support what the researchers need.

• Journal of KIISE:Computer Systems and Theory
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• v.28 no.12
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• pp.642-652
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• 2001

Recently, the advent of World-Wide-Web(WWW) and the explosive popularity of the Internet gave birth to collaborative applications which were enabled by computers and networks as their primary media. The progress of 3D computer graphics enabled collaborative application with 3D virtual environments or distributed virtual environments. In this paper, we explain our implementation of the Share collaboration engine which is for collaboration applications based on a distributed virtual environment. We introduce Virtual Architectural Engineering 2000 (VAE2000) that is our pilot application implemented with the Share collaboration engine. The Share collaboration engine proposes a new Share network architecture for management of participants, and it provides some synchronization methods for 3D objects in virtual collaboration. VAE2000 is an experimental application that tries to prevent wastes of human, material and time resources in networked virtual collaboration.