• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(3)
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• pp.169-172
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• 2000

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. And 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 Share collaboration engine and Virtual Architectural Engineering 2000 (VAE2000) system which is our pilot application implemented with Share collaboration engine. And we explain problems presented by our experiments with VAE2000 system. For those problems, we design our new middle-ware system, SHINE(SHared INternet Environment). The SHINE proposes new concepts and approaches for collaboration with 3D objects in a virtual world.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권11호
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• pp.5234-5251
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• 2018

It is well-known that virtualization technology can bring many benefits not only to users but also to service providers. From the view of system security and resource utility, higher resource sharing degree and higher system reliability can be obtained by the introduction of virtualization technology in distributed cloud. The small size time-sharing multiplexing technology which is based on virtual machine in distributed cloud platform can enhance the resource utilization effectively by server consolidation. In this paper, the concept of memory block and user satisfaction is redefined combined with user requirements. According to the unbalanced memory resource states and user preference requirements in multi-virtual machine environments, a model of proper memory resource allocation is proposed combined with memory block and user satisfaction, and at the same time a memory optimization allocation algorithm is proposed which is based on virtual memory block, makespan and user satisfaction under the premise of an orderly physical nodes states also. In the algorithm, a memory optimal problem can be transformed into a resource workload balance problem. All the virtual machine tasks are simulated in Cloudsim platform. And the experimental results show that the problem of virtual machine memory resource allocation can be solved flexibly and efficiently.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2006년도 학술대회 1부
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• pp.251-256
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• 2006

본 논문에서는 분산 촉각 가상 환경(DHVE; Distributed Haptic Virtual Environments)에서 촉각(haptic) 데이터가 어느 정도의 네트워크 트래픽을 가지며 또 효율적으로 통신 하는지에 대하여 실험하고 그 결과를 기술한다. 본 연구에서 제시하는 실험 데이터는 차세대 인터페이스로 떠오르는 촉각 장치의 높은 전송량과 실시간성을 요구하는 데이터가 분산 환경에서 서비스될 때 어떤 문제점을 가지는지에 대한 실질적이고 의미 있는 자료로 활용될 수 있을 것이다. 본 논문을 통해 우리는 기존의 분산 가상 환경들의 주요 논쟁점인 확장성(scalability), 안정성(safety) 등이 촉각 가상 환경에서는 어떻게 달라지는지 예측하고, 분산 가상 환경에서의 촉각 장치 활용의 유용성, 효율적인 네트워크 사용 방법, 촉각 기반 가상 환경이 구동될 수 있는 최저의 조건에 대해 고찰해 볼 수 있다. 본 논문은 차세대 인터페이스인 촉각 장치를 기존의 시스템에 안정적으로 추가하는 작업에 도움을 주며, 미래의 실감형 네트워크 가상 현실(Immersive Network Virtual Environment) 연구에 기초자료로 활용할 수 있을 것이다.

• 제어로봇시스템학회논문지
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• 제5권1호
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• pp.115-121
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• 1999

Advanced digital computer technology enables the computer-based controllers to replace the traditional analog controllers used in factory automations. This replacement, however, brings up the side effects caused by the quantization error and non-real-time execution of control software. This paper describes the structure of real-time simulator and controller that can be used for design and verification of real-time digital controllers. The virtual machine concept adopted by the proposed real-time simulator makes the proposed simulator be independent from the specific hardware platforms. The proposed system can also be used in the loosely coupled distributed environments connected through local area network using real-time message passing algorithm and virtual data table based on the shared memory mechanism.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.575-578
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• 2002

With the paradigm shifting from the principal of manufacturing efficiency to business globalization and rapid adaptation to its environments, more and more enterprises are being virtually organized as manufacturing network of different units in web. The formation of these enterprise called as Virtual Enterprise(VE) is becoming a growing trend as enterprises concentrating on core competence and economic benefit. This paper proposes the cooperation methodology for VEs which can be organized by the selection of manufacturing partners, and managed by the information flow infrastructure.

• 한국정보과학회논문지:시스템및이론
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• 제28권12호
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• pp.642-652
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• 2001

웹의 보급과 이에 따른 인터넷의 폭발적 확산은 컴퓨터와 네트워크를 핵심 매개로 하는 공동작업과 이에 따른 공동 문제해결의 출현을 가능하게 했으며 3차원 그래픽 기술의 발달과 함께 3차원 가상환경을 바탕으로 한 공동작업 응용이 출현하였다. 가상 건축 엔지니어링은 이런 3차원 가상환경 기반 공동작업 응용의 하나로 여러 설계자가 설계한 건축 설계 도면을 가상 공간에서 미리 통합하여 실현함으로써 발생할수 있는 오류를 사전에 발견하여 인적, 물적, 시간적 낭비를 막는 것을 그 목적으로 한다. 이 논문에서는 가상 건축 엔지니어링 응용을 제작하는데 고려해야 할 문제점을 정의하고 이를 해결하기 위해 구현된 Share 협동작업 엔진에 대해 설명한다. Share 협동작업 엔진은 새로운 Share 분산 네트워크 구조를 제안하여 네트워크 참여 개체를 관리하여 가상공동작업의 3차원 객체의 실시간 동기화를 지원하며, 파라메터기반 3차원 가상 객체 표현 기술을 이용하여 네트워크 대역폭 사용을 최소화하여 확장성을 향상시킨다. 또한 본 논문에서는 이를 바탕으로 실제로 제작된 가상 건축 엔지니어링 2000 (VAE2000) 서비스에 대해 설명하며 시뮬레이션과 실제 시연을 통해 이의 유용성을 증명한다.

• 한국정보처리학회논문지
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• 제6권11호
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• pp.3034-3045
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• 1999

For efficiently providing multimedia services, distributed computing environments are specified the requirements of various services and distributed object platforms applied an object-oriented technology by TINA Consortium and OMG CORBA. Because multimedia service applications are becoming large and distributing, their servicing managing interfaces among objects are being complicated. In order to solve these defects, it is necessary to suggest a new object grouping model and specify object service/management requirements can be introduced under the object groups. We have been developed the distributed object group platform that can group all individual objects by the relating services and can supply trading functions for interconnecting between distributed objects or object groups. In this paper, we designed and implemented the Virtual Drawing Board for remote equational services on the distributed object group platform we mentioned above. As results, we designed a basic structure and service interfaces, and showed execution procedures of VDB system consisted of distributed objects and objects groups for educational services. For supporting distributed services of VDB system, we used three kinds of tools as follows; IONA orbix 2.2 of CORBA compliance as an object middleware, OrbixTrader 1.0 for interconnection of distributed objects, and the OGTG we developed for interconnection of distributed object groups and checking access rights of objects included in an arbitrary object group.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2002년도 춘계학술대회 논문집
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• pp.221-228
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• 2002

The NAVER is based on a cluster of low-cost personal computers. The goal of NAVER is to provide flexible, extensible, scalable and re-configurable framework for the diverse virtual environments especially for Gamsung research experiments. Personal computers are divided into three servers are according to their specific functions: Render Server, Device Server and Control Server. While Device Server contains external modules requiring event-based communication for the integration, Control Server contains external modules requiring synchronous communication every frame. And, the Render Server consists of 5 managers: Scenario Manager, Event Manger, Command Manager, Interaction Manager and Sync Manager. In this paper, we discuss NAVER as effective distributed system and its application to Gamsung experiment.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.744-747
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• 1997

High performance digital computer technology enables the digital computer-based controllers to replace traditional analog controllers used for factory automations. This replacement, however, brings up the side effects caused by discrete quantization and non-real-time execution of control softwares. This paper describes the structure of real-time simulator and controller that can be used for design and verification of real-time digital controllers. The virtual machine concept adopted by real-time simulator make the proposed simulator be independent from the specific hardware platforms. The proposed system can also be used in the loosely coupled distributed environments connected through local area network using real-time message passing algorithm and virtual data table based on the shared memory mechanism.

• 한국CDE학회논문집
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• 제15권3호
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• pp.167-177
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• 2010

In recent years, the use of high-resolution tiled display system which does not have restrictions on the size of the screen and implements various layout of tile is increasing in order to evaluate the digital mock-up in physical scale or explore large engineering data set in detail. In this study, we developed multi-channel distributed visualization system which provides a virtual reality-based visual contents using 3D open-source graphics engine. Efficient data structures and exchange methods were proposed as a scene synchronization technology in PC cluster environments. DLP-Cube based tiled visualization system which provides $5{\times}2$ layout of display wall was developed and we validated our approach using this system. In addition, we introduced integrated control program that administrates PC cluster environment in remote and controls the layout of display channels.