• Proceedings of the Korean Society of Computer Information Conference
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• 2010.07a
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• pp.43-46
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• 2010

전력산업분야는 스마트그리드 표준체계 및 고도화된 정보통신 인프라의 도입과 보안 그리고 분산전력 등에 대한 신기술 도입에 의해서 급격한 변화기를 맞이하고 있다. 현재 미국과 EU에서는 세계시장을 겨냥해서 스마트그리드의 국제표준화를 주도하고 있으며, 제3세계에서는 전력설비 시장의 지속적 성장이 예상되고 있다. 이에 국내에서도 국제 경쟁력 확보 및 신성장동력 창출을 목표로 연구가 진행 중이다. 전력체계의 운영망과 별개의 시험망 구성이 필요하며, 그 시험망을 통한 검증을 위해 시험망내 표준규격의 통신환경의 설계 및 기능검증은 매우 중요한 요소이다. 본 논문에서는 시험평가망 구성이후 평가를 위해 사용할 수 있는 주요 Component의 설계과정 중의 일부인 IEC 61850기반의 MMS 통신 환경구성 및 기능검증을 위한 연구결과에 대해 설명한다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.45 no.5
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• pp.79-86
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• 2008

H.264/AVC is the newest international video coding standard developed by the joint ITU-T and ISO/IEC standards organizations. This newest video coding standard offers much higher coding efficiency than the H.261, H.263 and MPEG-4. But it has high computing complexity and high H/W resources wasting problem. This paper described the two unit parallel pipeline structure. This new structure comparing with standard model decreased the computing complexity of 67% and the H/W resources waste of 3%.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.10a
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• pp.331-332
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• 2014

최근 해양 분야에서는 해상과 육상의 다양한 데이터를 통합, 활용하여 해상에서의 선박의 안전 운항, 해양 환경 및 자원의 보호 등의 활동에 필요한 정보를 적시에 제공하는 정보 서비스 체계로 e-Navigation에 대한 관심이 높아지고 있다. 국제해사기구(IMO)를 비롯한 해양 분야 국제기구 등은 e-Navigation을 위한 정책, 표준, 관련 기술 및 시스템 개발 등 e-Navigation을 주도하기 위한 많은 노력을 기울이고 있다. UN산하 해사안전 분야 전문기구인 국제해사기구(IMO)는 인적과실에 의한 해양사고를 줄이기 위해 2006년 e-Navigation 도입을 결정, 2018년부터 시행하기 위해 국제협약 제 개정 등을 추진하고 있다. 해양수산부는 국제해상안전 규제동향에 선제적으로 대응함으로써 해양안전을 강화하는 한편, 관련 분야 신산업 육성과 일자리 창출 등을 목표로 하는 "한국형 e-Navigation 대응전략"을 발표하였다. 항로표지는 해상에서의 안전한 활동을 지원하는 필수 시설로써 e-Navigation 시스템의 중요한 운영자원으로 활용될 예정이며 이에 국내에서도 e-Navigation 시스템 운영을 위한 항로표지시설에 대한 기술 개발이 절실한 실정이다. 이러한 항로표지를 이용한 한국형 e-Navigation 운영을 위한 발전 방안에 대하여 기술하였다.

• Convergence Security Journal
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• v.5 no.1
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• pp.29-34
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• 2005

Internet becomes absolutely necessary tools due to rapid progress of information technology. Educational correspondence about an age of information demand is focused on a learner and remote education based on information technology WBI(Web Based Instruction) is a formation that remotly educate a learner using web, possible mutual reaction between instructor and learner, submit various studying material, has a good point to overcome spatial restriction. Internal and external standardization working is accelerated and recently XML security studies are activated using XML which is next generation web standard document format. In this paper, we propose multi-Certification of agent system using XML digital signature to satisfy security requirement.

• Journal of the Korea Computer Industry Society
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• v.6 no.3
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• pp.457-464
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• 2005

Internet becomes absolutely necessary tools due to rapid progress of information technology. Educational correspondence abount an age of information demand is a education focused on a learner and remote education based on information technology. Internal and external standardization working is accelerated and recently XML security studies are activated using XML which is next generation web standard document format. But using these are main contents that users have to pay about Certification service to get CA certificate from 2004 me. This paper propose multiplex Certification remote education agent system using XML digital signature to satisfy security requirement.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2004.10a
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• pp.215-222
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• 2004

We synthesized a aziridine bonding agent that play an important role in increasing the adhesion property between polymer binders and solid particles. It increases the physical properties of polymer-based propellant. Chemical reaction between two materials increase the interface adhesion. We analyzed and studied the chemical characteristics of the material and physical properties of a liner applied the aziridine bonding agent. We also studied the adhesion property of a liner/propellant applied the aziridine bonding agent. 3M was use as control group. In accordance with US MIS (Missile Interim Specification) we examined the chemical properties. As a result of our study, newly synthesized aziridine bonding agent was as good as quality of 3M HX-868.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.3
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• pp.23-28
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• 2021

In recent years, research on smart factory wireless mobile communication technology that wirelessly remotely controls utilities is being actively conducted. The Wi-SUN(Wireless Smart Utility Network) Alliance proposed Wi-SUN protocol structure suitable for building a platform such as a smart factory as a new wireless communication standardization standard based on EEE802.15.4g/e. It analyzes the performance of the IEEE802.15.4e CSL(Coordinated Sampled Listening) Mode MAC(Media Access Control) in terms of latency and looks at considerations for efficient operation.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.305-307
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• 2020

이머시브 비디오 서비스를 위해 MPEG-I Visual 그룹에서는 3DoF+ 기술과 관련하여 MIV(Metadata for Immersive video)의 표준화를 진행하고 있으며, 이를 위해 다시점 영상 및 전방위 장면을 촬영한 ERP 규격의 영상들이 주어진 경우에 운동시차를 제공할 수 있는 영상 합성 레퍼런스 소프트웨어인 TMIV SW를 제공한다. TMIV는 기본적으로 송신부인 인코더와 수신부인 디코더로 구성이 되어있으며, 인코더에서 가장 중요한 기능은 다수의 입력 시점영상 간의 중복된 데이터를 찾아내서 제거하는 프루닝 과정이다. 프루닝 방법에 따라 데이터 전송량과 디코더에서의 합성 품질이 달라지기 때문에 인코더에서 핵심이라고 할 수 있다. 본 논문은 인코더의 프루닝의 효율을 높이기 위해 전체 흐름도에서 프루닝 순서 변경 과정을 추가하고 그 과정에서 시점 영상간 중첩 영역을 계산하여 이를 토대로 프루닝 순서를 결정하는 방법을 제안하였고 이를 통해 데이터 압축률이 향상됨을 확인할 수 있었고, 또한 수신부에서 영상 합성의 품질이 달라짐을 확인할 수 있었다.

• Journal of the Korean Association of Geographic Information Studies
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• v.17 no.2
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• pp.44-58
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• 2014

In this study, a standard vector data model was developed for interoperability of river-geospatial information and for verification purpose the applicability of the standard vector model was evaluated using a model to RIMGIS vector data at Changnyeong-Hapcheon & Gangjung-Goryeong irrigation watershed. The standards from ISO and OGC were analyzed and the river geospatial data model standard was established by applying the standards. The ERD was designed based on the analysis information on data characteristics and relationship. The verification of RIMGIS vector data included points, lines and polygon to develope GDM was carried out by comparing with the data by layer. This conducting comparison of basic spatial data and attribute data to each record and spatial information vertex. The error in the process of conversion was 0 %, indicating no problem with model. Our Geospatial Data Model presented in this study provides a new and consistent format for the storage and retrieval of river geospatial data from connected database. It is designed to facilitators integrated analysis of large data sets collected by multiple institutes.

• Restorative Dentistry and Endodontics
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• v.30 no.2
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• pp.112-120
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• 2005

This study was done to evaluate whether there were any differences in microleakage of class V composite restorations according to restoration site and cavity size. Total sixty-four restorations were made in molar teeth using Esthet-X. Small ($2\;{\times}\;2\;{\times}\;1.5\;mm$) and large ($4{\times}2{\times}1.5\;mm$) restorations were made at the buccal/lingual surface and the proximal surface each. After 1,000 times of thermocycling ($5^{\circ}\;-\;55^{\circ}C$), resin replica was made and the percentage of marginal gap to the whole periphery of the restoration was estimated from SEM evaluation. Thermocycled tooth was dye penetrated with $50\%$ silver nitrate solution. After imbedding in an auto-curing resin, it was serially ground with a thickness of 0.25 mm. Volumetric microleakage was estimated after reconstructing three dimensionally. Two-way ANOVA and independent T-test for dye volume, Mann-Whitney U test for the percentage of marginal gap, Spearman's rho test for the relationship between two techniques were used, The results were as follows : 1. The site and size of the restoration affected on the microleakage of restoration. Namely, much more leakage was seen in the proximal and the large restorations rather than the buccal/lingual and the small restorations. 2. Close relationship was found between two techniques (Correlation coefficient = 0.614/ P = 0.000). Within the limits of this study, it was noted that proximal and the large restorations leaked more than buccal/lingual and the small restorations. Therefore, it should be strictly recommended large exposure of margins should be avoided by reducing unnecessary tooth reduction.