• Journal of the Korean Society for Precision Engineering
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• v.20 no.2
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• pp.120-128
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• 2003

When considering the use of rapid prototyping (RP), there are many issues a designer has to address for handling an STL model, the de facto standard fur RP. Today designers can skip all these issues by visiting web-based service bureaus that readily supply needed information for the RP services. Since orders are taken for RP parts through the web page of service providers designers are now asked to upload their STL files to the company server either by direct upload, ftp file transfer, or as an e-mail attachment. If the service bureau, however, fixes or edits an STL filceto optimize the RP process but neglects to tell its customer about the rework in detail, it may cause problems down the line in processing of the original CAD data for other applications. In this paper, we propose a framework for a collaborative virtual environment between CAD designers and RP processes on the internet which directly provides designers with an advanced preprocessor functionality, design visualization, as well as model display, repair, and slicing over the network. This can help smooth data transfer from CAD to RP process with minimum inconsistency in CAD.

• Journal of Digital Contents Society
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• v.4 no.2
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• pp.139-146
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• 2003

This paper explains the design and implementation of the ERA(Error Recovery Agent). ERA is a system that is suitable for detecting, sharing and recovering software error based on multimedia distance education system. This system consists of an ED, ES, and ER. ED detects an error by hooking techniques. ES is an agent which is an error sharing system for distributed multimedia distance education system. We propose how an error application can be treated and recovered as 'media' in a multimedia collaborative environment.

• Journal of Digital Contents Society
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• v.15 no.1
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• pp.39-43
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• 2014

This paper suggested a whiteboard for multimedia collaboration work. We implemented the whiteboard so that the users participated in collaborative work may refer shared media objects as the same view to others. In this paper, we discuss a method for increasing reliability of media data through whiteboard. This paper explains a performance analysis of a media data system running on distributed multimedia environment using the rule-based DEVS modeling and simulation techniques.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.35 no.12
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• pp.1121-1128
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• 2007

MDO(Multidisciplinary Design and Optimization) can be applied for design of complex systems such as aircraft and SLV(Space Launch Vehicle). MDO System can be an integrated environment or a system, which is for synthetic and instantaneous analysis and design optimization in various design fields. MDO System has to efficiently use and integrate distributed resources such as various analysis codes, optimization codes, CAD, DBMS, GUI, and etc. in heterogeneous environments. In this paper, we present Web Services-based MDO System that integrates resources for MDO using Globus Toolkit and provides organic autonomous execution using automation technique such as Workflow system and agent. And also, it provides collaborative design environment through web user interfaces.

• Journal of Information Technology and Architecture
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• v.9 no.3
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• pp.275-285
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• 2012

DIFs (Data Interchange Formats) are needed to enhance interoperability of physically distributed organizations in SBA (Simulation Based Acquisition) process. DIFs play a role as a template of DPDs (Distributed Product Descriptions) and provide capability to use information directly without data format interchange process by allowing access to DPDs, which include various information and M&S (Modeling & Simulation) resources. This characteristic is essential for interoperability in ICE (Integrated Collaborative Environment) based SBA. This paper proposes a framework for the DIF and outputs from each phase of acquisition process for configuration data related to design and manufacturing in SBA process - Conceptual Data Model, Logical Data Model, Physical Data Model and Physical DIF based on XML. Finally, we propose the DIF model architecture and demonstrate the implementation of DIF example based on it.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.677-684
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• 2009

With various sensor network and ubiquitous technologies, we can extend interaction area from a virtual domain to physical space domain. This spatial interaction is differ in that traditional interaction is mainly processed by direct interaction with the computer machine which is a target machine or provides interaction tools and the spatial interaction is performed indirectly between users with smart interaction tools and many distributed components of space. So, this interaction gives methods to users to control whole manageable space components by registering and recognizing objects. Finally, this paper provides an effective spatial interaction method with template-based task mapping algorithm which is sorted by historical interaction data for support of users' intended task. And then, we analyze how much the system performance would be improved with the task mapping algorithm and conclude with an introduction of a GUI method to visualize results of spatial interaction.

• IE interfaces
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• v.17 no.1
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• pp.128-141
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• 2004

Although a number of container terminal simulators have been developed for various purposes, none of the existing simulators allow the system structure to reuse the system structure depending on application. Our goal is to develop highly reusable, highly inter-operable and flexible container terminal simulation system. The High Level Architecture(HLA) is an architecture for reuse and inter-operation of simulation. It is based on premise that no simulation can satisfy all use and users. An individual simulation or set of simulations developed for one purpose can be applied to another application under the HLA concept of the federation : a composable set of interacting simulations. The intent of the HLA is a structure which will support reuse of capabilities available in different simulations, ultimately reducing the cost and time required to create a synthetic environment for a new purpose, and the possibility of distributed collaborative development of complex simulation applications. In this paper, we discuss the design of a HLA-based port container terminal simulation system. Furthermore, we describe various technical motivations for HLA, the key elements of the architecture and how they are minimum and essential to the goal of reuse and interoperability.

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.6
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• pp.670-682
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• 1999

사용자들의 정보교환이 주목적인 분산 멀티미디어 응용 프로그램은 많은 분야에서 개발되어 사용되고 있다. 화상/음성 회의, 채팅도구, 화이트보드, 전자공책등 독립적으로 수행하는 응용 프로그램들이 있는데, 이러한 분산 멀티미디어 응용 프로그램을 이용하여 , 지리적으로 떨어져 있는 사용자들이 함께 일할수 있는 환경인 협동 작업 환경을 제공할 수있다. 최근에 이러한 협동 작업 환경에 대한 관심이 급증하고 있는데 더 효율적이고 신뢰할 수 있는 협동작업환경을 제공하기 위해서는플랫폼에 독립적이고 보안성이 제공되어야 한다. 또한 사용자가 협동 작업을 생성, 삭제, 참여, 탈퇴할 수 있는 기능도 제공되어야한다. 이러한 기능을 제공하는 서비스를 세션서비스라고 한다. 본 논문은 분산멀티미디어 협동 작업 환경을 위한 CORBA 기반의 보안성있는 세션 서비스를 제안한다. 분산 객체 기술인 CORBA는 객체의 위치와 구현에 상관없이 그들 사이의 통신을 가능하게 하여 주는데 , 이러한 CORBA의 장점을 이용하여 플랫폼에 독립적이면서 보안성을 강화하고 일반적인 세션 정보를 제공하는 서비스를 제안한다. 그 타당성을 입증하기 위해 세션서비스의 프로토타입이 분산 멀티미디어 시스템인 MAESTRO 의 일부분으로 개발되었었다. 여기에서 제안한 세션서비스는 OMG 표준의 새로운 서비스로 제안될수 있을 것이다.

• Journal of Internet Computing and Services
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• v.8 no.1
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• pp.99-113
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• 2007

In the rapidly changing e-business environment, organizations need to share information, process business transactions, and enhance collaborations with relevant entities by taking advantage of the various technologies. However, there are always the security issues that need to be handled in order for the e-business operations to be run efficiently. In this research, we suggest the new security authorization model for safety flexible supporting the needs of e-business (e-marketplace) in an organization. This proposed model provides the scalable of access control policy among multi-domains, and preservation of flexible authorization management in distributed system environments. For servers to take the access control policy and enforcement decisions, we also describe the feasible authorization architecture is concerned with how they might seek advice and guideline from formal access control model.

• The Journal of Society for e-Business Studies
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• v.10 no.4
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• pp.19-33
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• 2005

In this study, we propose a methodology of mating it easy to integrate the heterogeneous and distributed information of e-Business environments with the semantic web components , knowledge representation, ontology and agents. It is based on a collaborative interoperable environment, which should be constructed by meta-modeling and employing agents , and the syntactic/semantic integration. We adopt OWL(Web Ontology Language) to specify ontology in a layered architecture for each agent to use, which is based on the IRDS (Information Resource Dictionary Standard) framework. And we give an illustrative example using the terms from PSL(Process Specification Language)-ontology. By defining, managing and sharing resources and business-processes on the proposed framework, it could be possible to get rid of the cause of redundancy and inconsistency.