• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.133-135
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• 2020

현재 자율운항선박의 성공적 달성을 위해 다양한 연구개발이 진행 중이며 이와 관련하여 자율운항선박의 안전항해 지원을 위해 자율운항 지원 서비스와 해양사고 대응 서비스가 개발되고 있다. 자율운항 지원 서비스는 전자해도표시시스템(ECDIS, Electronic Chart Display and Information System)에서 수립하는 항로 계획 정보를 육상 운항조정상황실에 전송하여 충돌 위험 예측 후 유용한 정보를 자율운항선박에게 제공하는 서비스이다. 이 서비스를 통해 타 선박과 자율운항선박간의 조우 지점과 타 선박의 사전 변침정보를 미리 알 수 있기 때문에 충돌 예측 정보로써 활용할 수 있다. 해양사고 대응 서비스는 현재 사람에 의존적인 해양사고 상황인식 및 해양사고 대응기관에 전파하는 것을 자동으로 상황을 인식하고 사고 대응하는 서비스이다. 이 서비스를 통해 사고 단계별 유용한 정보를 사고선박 및 주변 해양사고 대응기관에 정보를 제공함으로써 추가적인 해양사고 방지와 즉각 대응이 가능하다. 본 연구에서는 2가지 서비스를 성공적으로 제공하기 위해 시스템의 요구사항을 분석하고 시스템 아키텍처를 설계하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.410-412
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• 2008

본 논문에서는 의료기관내 이기종 시스템(OCS, PACS, EMR 등) 및 외부 기관(타 의료기관, 정부기관 등)과의 원활한 의료정보 공유를 위한 Framework을 제시하고자 한다. 의료기관 내/외부의 이질적인 Legacy System 간의 자료 교환을 위하여 현재 범용적으로 사용되는 HL7 Messaging standards를 기반으로 정보를 생성 공유하게 한다. 또한, HL7 Message 생성시 표현기법이 다른 데이터들을 HL7 표준에 해당하는 데이터로 자동 변환시킬 수 있는 방안을 제시하고, 이렇게 모인 의료정보를 다기종 Platform(PC, Mobile phone 등)에서 효율적인 접근을 위한 모델도 함께 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.884-887
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• 2007

에이전트란 사용자의 관점에서 시스템이 사용자를 대신해서 사용자가 원하는 작업을 자동적으로 수행해 주는 소프트웨어로서 오래 전부터 연구되어 1990년대 초부터 관련제품도 대거 등장하게 되었다. 하지만, 나날이 다양해지고 복잡해지는 사용자의 요구를 해결하려면 단독 에이전트의 능력으로는 한계가 있었고 그 해결 방법으로 지역적으로 분산된 다른 에이전트의 도움을 받아 처리하는 분산 협동 처리의 개념이 등장하였다. 여러 에이전트의 분산 협동 처리를 위해서는 에이전트간 통신이 필수적이다. 그 목적은 정보나 작업 처리의 공유와 교환에 있으며 다른 에이전트에게 처리를 요구하기도 하기 때문이다. 이러한 요구사항을 만족시키기 위해서는 지능적인 작업을 수행하기 위한 에이전트, 에이전트 플랫폼이 효율적 구성이 이루어져야 한다. 이러한 에이전트와 에이전트 플랫폼으로 구성된 에이전트 네트워크를 효율적 구성하기 위하여 본 논문에서는 이러한 과정에서 발생할 수 있는 기존 방식의 문제점들을 JXTA의 예를 통해 지적하고, 개선방안으로 에이전트 네트워크 자가 구성방법을 소개하려 한다.

• Resources Recycling
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• v.24 no.2
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• pp.3-12
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• 2015

We researched characteristics of heat recovery rate and fouling according to structures and materials in heat exchangers like water preheater and air preheater. Economizer and air preheater have used in thermal electric power plant. we made small incinerator and heat exchangers to carry out simulated experiment. We observed fouling formation and change of heat recovery rate, combusting powdered coal for 24 hr. In economizer, fin tube type had the largest amount of fouling formation, followed by tube line type > pipe type > auto washing type according to structures. As heat recovery rate, fin tube showed highest recovery rate, followed by auto washing type > pipe type > tube line type. In air preheater, fin tube type had the largest amount of fouling formation, followed by fin plate type > pipe type > pipe type coated by teflon > pipe type coated by ceramic according to structures. And then, heat recovery rate showed the same oder.

• The Transactions of the Korea Information Processing Society
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• v.7 no.12
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• pp.3910-3922
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• 2000

Current power systems are distributed geographically and operated in the form of Energy Management System(EMS)/ Supervision Control and Data Acquisition(SCADA) with the aid of computers and communications. Recently a variety of utilities have had interests in using inforrration technology to bring the efficiency and low operational costs. There is also a trend to integrdte the production, transmission, distribution and management/control of power into one and unified distributed system. To this end, Electric Power Hesearch Institute(EPRI) announced a new standard communication protocol called Inter-Control Center Protocol(ICCP).ICCP specifies the use of Manufacturing Message Specification(MMS) for services required by rccr in application layer and supports the communications between heterogeneous control centers. This paper presents the characteristics of MMS,ICCP and their relationship. Futherrnore, we implement the basic functional blocks of ICCP using MMS services under TCI/IP environments. Finally, we model a simple power system and apply the rccp protocol to this system in a window-based scheme, and finally show the operation and validation of this protocol.

• Journal of Advanced Navigation Technology
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• v.19 no.5
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• pp.354-362
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• 2015

In this study, for integrated management and inter-exchange of operational data generated by ships and land-side information on safe and business, a vessel communication system with modular functions was designed that applied high efficiency compression, least-cost algorithms and Inmarsat FBB connection automation system. Performance test at the KTsat Kumsan satellite earth station; system was found to delivered an average transfer speed of 7 kB/S, which was significant improvement from the existing commercial product's average speed of 5 kB/S. It also delivered twice the efficiency of the existing product in terms of compression rate and transfer of the most widely used office files in maritime businesses.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.97-99
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• 2011

As interoperability between systems in distributed environment has been important, it has been possible for various organizations to share resources and exchange relevant information. However, semantic heterogeneity between the systems and organizations causes the problem of making their interoperability impossible. Thereby, in this paper, we propose an ontology matching-based knowledge management system which can automatically discover semantic correspondences between ontologies. Moreover, even though there have been many existing ontology matchers, it is still difficult to directly apply them to the proposed system. To deal with the problems, we want to discover matching patterns (MP) which they discover from two given ontologies.

• Journal of the Korean Society for Precision Engineering
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• v.30 no.4
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• pp.397-402
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• 2013

In this study, we carried out the each lines of section, using GC (green silicon carbide) whetstone, the SCM415 material which separated by after and before heat treatments process, in 3+2 axis machining centers for integrated grinding after cutting end mill works, the spindle speed 8000 rpm and feed rate 150 mm/min. For the analysis of the centerline average roughness (Ra), we measured by 10 steps stages. Using Finite element analysis, we found the result of the load analysis effect of the assembly parts, when applied the 11 kg's load on both side of the ATC (Automatic tool change) arm. The result is as follows. For the centerline average roughness (Ra) in the non-heat treatment work pieces, are appeared the most favorable in the tenth section are $0.510{\mu}m$, that were shown in the near the straight line section which is the smallest deformation of curve. In addition, the bad surface roughness appears on the path is to long by changing angle, the more inclined depth of cut, because the chip discharging is not smoothly.

• Journal of Internet Computing and Services
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• v.7 no.6
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• pp.157-174
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• 2006

Ajax interaction model changes the posture of web application to become a stateful over HTTP. Ajax applications are long-lived inthe browser. XMLHTTPRequest (XHR) is used to facilitate the data exchange. Using HTTPS over this interaction is not viable because of the frequency of data exchange. Moreover, switching of protocols form HTTP to HTTPS for sensitive information is prohibited because of server-of-origin policy. The longevity, constraint, and asynchronous features of Ajax application need to hove a different authentication and session fondling mechanism that invoke re-authentication. This paper presents an authentication and session management scheme using Ajax. The scheme is design lo invoke periodic and event based re-authentication in the background using digest authentication with auto-generated password similar to OTP (One Time Password). The authentication and session management are wrapped into a framework called AWASec (Ajax Web Application Security) for coupling to avoid broken authentication and session management.

• The KIPS Transactions:PartD
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• v.12D no.5 s.101
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• pp.781-788
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• 2005

MTF message is the normalized and standardized format which is used in the time when it tries to transmit data to other systems or exchanges needed information in defense message systems. XML can support variety of search functionality and is estimated to be the best way from the view of efficient presentation and exchange in internet based environment, based on advantage which is independent of hardware and software. US army brought in XML-MTF combining with XML based technology, but we do not contain such a MTF system, and necessity of MTF is increasing for combined operation between ROK and US as a lot of C4I system were transferred to Web based systems. In this paper, we make analysis of fundamental structure, organization of paragraph, witting regulation of MTF message. We present the rule of naming element and fundamental mapping rule for transformation of its XML based on it. Also, we prove that MTF message can be transformed to XML document by trying to transforming sample documents to XML document applying presented mapping rule, creating MTF message based on it and implement program which can automatically transform them to XML-MTF.