• 한국정보처리학회논문지
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• 제3권5호
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• pp.1046-1058
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• 1996

본 논문은 미래의 초고속 통신망의 환경에서 멀티미디어 기술을 이용하는 차세대 의료 진단 시스템을 구축하는 것이 목적이다. 이 시스템에서 원격지의 의사는 환자에 관한 정보의 MRK, CT, CR, Angio 같은 2차원 환부 의료 영상으로 부터 재 구성된 3차 원 의료 영상을 통신망을 통해 공유하며 공동 진단을 하게 된다. 이 진단화의 시스템 에서는 음성, 환자의 정보, 지시점(Hand Position), 3차원 의료 영상, 제어 데이터를 주고 받으며 진다회의를 제어한다. 3차원 의료 영상은 분석적 적분 계산을 이용한 광선 추적법에 의해 재구성 된다. 의료 데이터 베이스는 환자의 기본 정보, 의료 영상 정보, 사용자, 진단 결과 등으로 구성한다.

• Journal of Communications and Networks
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• 제6권1호
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• pp.38-45
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• 2004

The ABR point-to-multipoint connection is now playing a more important role than before. Many consolidation algorithms have been proposed to solve the consolidation noise problem and the slow transient response problem. But few timeout algorithms are proposed to handle the non-responsive branches for the multicast connections. Chen’s algorithm needs exchanging control messages between switches [9]. Besides, it may mistake a responsive branch as a non-responsive branch because of fast changes in source rates, which causes wrong information in BRM cells and may lead to network congestion and data losses in the responsive branch. We propose a simple timeout algorithm which can handle the non-responsive branches without exchanging message between switches. The timeout value for each switch is computed locally. Simulation results show that the proposed timeout algorithm can efficiently handle the non-responsive branches and utilize the available bandwidth within a small period of time. In addition, our algorithm could handle the situation when the source rates change quickly.

• 대한산업공학회지
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• 제23권3호
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• pp.597-608
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• 1997

Life cycle product data is very important yet difficult to handle for manufacturing companies. Shoring and exchanging product data over world-wide-web is a part of key technology to implement PDM or CALS. STEP is widely accepted as a standard to represent the life-cycle product model data. Described in this paper is a web browser plug-in that can graphically display and explore product data represented by STEP over internet. By the use of the plug-in (named "npSTEP"), a product model data stored in STEP format on a web server can be displayed on a commonly used web client (browser), such as Netscape navigator, without any format conversion process. Furthermore one can explore the components or attributes of the product model data in hierarchical manner.

• 한국CDE학회논문집
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• 제6권4호
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• pp.229-235
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• 2001

As the networks (i.e., intranet and internet) proliferate all over the world, it is inevitable to move some (or all) of the enterprise activities into virtual spaces. Differently from business data, product data have complex semantics and thus are not properly exchanged among different application programs. Even though some neutral formats of product data have been developed by standard organizations, exchanging them among various application programs still needs the comprehensive understanding of the complex semantics. Recently, it is widely recognized that capturing more knowledge is the next step to overcome the current difficulties on sharing product data. In this paper, we utilize the ontology concept in order to facilitate information search far product data in the internet environment. A prototype of search system implemented using the ontology for automobile product data is presented.

• 통상정보연구
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• 제6권1호
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• pp.191-210
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• 2004

There are increasing needs for an individual or enterprise to interchange documents electronically through communication network to enhance the efficiency of business, owing to rapid process of transactions. But e-commerce encounters the problems regarding the handling the electronic documents, that is to say, deposit and proof of the electronic documents. This paper deals with Authorized Electronic Data Depot as an integrated system for processing, relaying and proving documents that. Authorized Electronic Data Depot operates as e-enabler in exchanging documents in trust among administrative agencies and a comprehensive government directory, digital government seal certification system and DNS system. Authorized Electronic Data Depot leads public and private sectors to save the paper-related costs. But the regulations concerning an authorized electronic data depot is introduced in the course of revision of Electronic Transactions Act. The purpose of this paper is to suggest some guidelines in legalizing the authorized electronic data depot.

• 한국컴퓨터정보학회논문지
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• 제17권8호
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• pp.71-80
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• 2012

최근 클라우드 컴퓨팅을 위한 많은 표준화 연구가 진행되어 왔으나 데이터 공유 및 교환을 위한 표준 연구는 거의 이루어지지 않았다. 무엇보다 해당 표준화 기구에서는 의미 상호운용성 향상을 위한 구체적인 표준화 항목 및 참조 모델을 제시하고 있지 않다. 이 논문에서는 현재까지의 표준화 문제점을 정의하고, 의미 상호운용성 제공을 위한 구체적인 표준화 항목 및 참조 모델을 제안한다. 이를 위해 먼저 클라우드 컴퓨팅을 위한 전반적인 표준화 동향을 분석하고, 특히 데이터의 의미적 상호운용성을 제공을 위한 표준 개발 현황을 기술한다. 또한 다양한 분야의 표준개발에 이용된 데이터 교환 및 관리 분야의 표준 개념을 기반으로 잠재적인 표준화 항목을 정의한다. 마지막으로, 표준화 항목 간의관계성과 전체적인 의미 상호운용성 과정을 보여주기 위해 참조 모델을 기술한다. 이 논문은 표준 개발을 위한 가이드라인으로서 이용될 수 있으며, 아울러 클라우드 컴퓨팅의 표준화를 촉진할 수 있다.

• 한국정밀공학회지
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• 제20권10호
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• pp.218-225
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• 2003

A diagnostic system has been developed which reports modeling errors generated when exchanging CAD data using IGES (Initial Graphics Exchange Specification) format. The system determines whether the CAD data contains errors. It also helps to define the criteria for determining the integrity and interoperability of CAD data with downstream applications of another CAD/CAM/CAE/PDM systems. The methodology of our algorithms is to analyze IGES model data by identifying errors and anomalies with respect to the diagnosis of geometry and topology. The GUI (Graphic User Interface) of the developed system helps users to input values and to visualize diagnostic results at real time.

• International Journal of Internet, Broadcasting and Communication
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• 제11권3호
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• pp.59-63
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• 2019

VoIP technology is a technology for exchanging voice or video data through IP network. Various protocols are used for this technique, in particular, RTP(Real-time Transport Protocol) protocol is used to exchange voice data. In recent years, with the development of communication technology, there has been an increasing tendency of services such as "Kakao Voice Talk" to exchange voice and video data through IP network. Most of these services provide a service with security guarantee by a user authentication process and an encryption process. However, RTP protocol does not require encryption when transmitting data. Therefore, there is an exposition risk in the voice data using RTP protocol. We will present the risk of the situation where packets are sniffed in VoIP(Voice over IP) communication using RTP protocol. To this end, we configured a VoIP telephone network, applied our own sniffing tool, and analyzed the sniffed packets to show the risk that users' data could be exposed unprotected.

• Journal of Information Processing Systems
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• 제19권3호
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• pp.377-384
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• 2023

The existence of abnormal breakpoint data leads to poor channel balance in wireless sensor networks (WSN). To enhance the communication quality of WSNs, a method for positioning abnormal breakpoint data in WSNs on the basis of signal reconstruction is studied. The WSN signal is collected using compressed sensing theory; the common part of the associated data set is mined by exchanging common information among the cluster head nodes, and the independent parts are updated within each cluster head node. To solve the non-convergence problem in the distributed computing, the approximate term is introduced into the optimization objective function to make the sub-optimization problem strictly convex. And the decompressed sensing signal reconstruction problem is addressed by the alternating direction multiplier method to realize the distributed signal reconstruction of WSNs. Based on the reconstructed WSN signal, the abnormal breakpoint data is located according to the characteristic information of the cross-power spectrum. The proposed method can accurately acquire and reconstruct the signal, reduce the bit error rate during signal transmission, and enhance the communication quality of the experimental object.

• 한국자기공명학회논문지
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• 제11권1호
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• pp.1-9
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• 2007

An unequal site exchanging system induced by restricted rotation of 9-methyl group in 1,8-dichloro-9-triptycene has been studied by spin-lattice relaxation and 2D-EXSY experiments. The exchange rate obtained from relaxation studies is very well coincident to the result of line shape analysis, and the difference of the relaxation times ($T_1$) in two different sites has an important role to analyze 2D-EXSY experimental data.