• Review of KIISC
• /
• v.17 no.3
• /
• pp.49-59
• /
• 2007

정보보호 시스템 평가제도는 안정성과 신뢰성이 검증된 시스템사용을 권장하고 이를 통해 정보보호 제품 개발을 유도하며 정보보호 산업 육성을 기여하기 위한 것이다. 최근 정보보호 제품의 해외 경쟁력 증대를 위하여 인증된 평가기관 설립의 필요성이 대두되고 있어 본 논문에서는 국내 환경에 적합한 국내 정보보호 시스템 평가인증 제도의 평가기관 자격 기준을 제안하고자 한다. 이를 위하여 본 논문에서는 해외 각 국의 인증 요구사항 및 절차를 항목별로 상세히 비교 분석하였으며, 이를 토대로 국내 실정에 맞는 국내 정보보호 시스템 평가기관 승인 요구사항을 도출하였다. 적절히 제안된 평가 기관 설립 기준안은 평가가기관의 추가 설립을 위한 기준안으로 활용될 수 있을 것으로 기대한다.

• 한국정보통신설비학회:학술대회논문집
• /
• 2007.08a
• /
• pp.111-116
• /
• 2007

본 논문에서는 인터넷전화 품질평가를 위한 국내 동향에 대하여 기술하고, BcN영상전화 서비스에 대한 SLA 품질지표 및 품질기준을 국내외 동향 및 기준표준화에 근거하여 마련하고 이를 검증하기 위한 품질측정 방법을 제시하고자 한다. 이를 통해서 영상전화 서비스의 SLA 품질기준이 조기에 마련되어 국내 통신사업자들의 이용약관에 반영되기를 기대한다. 따라서 본 논문의 목차는 서론, SLA 개요, 영상전화 서비스의 품질지표 및 기준, 품질지표별 측정방법 및 시험측정 결과에 대하여 기술하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2007.12a
• /
• pp.87-89
• /
• 2007

우리나라에서는 1995년 5월 서해권 DGPS 보정정보 전송 서비스를 시작으로 NDGPS 기준국망 구축을 완료하고, 선박의 안전한 항행을 위해 실시간 DGPS 보정정보를 국내 연안과 도서지역에 송신하고 있다. 본 논문에서는 NDGPS와 유사한 보정정보 서비스로서 우리나라에서도 수신이 가능한 일본의 위성기반 보정위성항법체계인 MSAS와 현재 우리나라에서 VHF 대역으로 서비스하고 있는 NDGPS 의 성능을 항해장비 이용 관점에서 비교분석한다. 이를 위해 본 논문은 NDGPS 기준국과 이용자 사이의 기저거리를 기준으로 보정정보 도달시간과 수평측위 정확도를 측정한다. 그리고, NDGPS 와 MSAS 간의 성능차이와 항해장비용 보정시스템으로서 MSAS 적용 가능성에 대한 분석결과를 보인다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2011.04a
• /
• pp.94-99
• /
• 2011

원자력 발전소에 사용되는 케이블은 화재발생시 화재전파를 억제하기 위해 일정수준의 화염시험을 만족한 것을 사용하도록 규정되어 있다. 이러한 케이블 화염시험 기준은 나라마다 약간씩 차이가 있는데 본 논문에서는 국내와 미국, 프랑스, 캐나다의 원자력 발전소 케이블 화염시험 기준의 국가별 차이점을 비교 분석 하였다. 비교분석결과 각 나라의 케이블 화염시험 코드는 세부 항목별로 약간씩 차이가 있으나 전체적으로 모든 코드가 동등한 수준의 기준을 갖고 있는 것으로 분석 되었다. 따라서 어느 하나의 코드를 만족하는 전기케이블은 다른 코드의 요구 사항을 만족하는 것으로 볼 수 있다.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.5 no.1
• /
• pp.30-35
• /
• 2003

The study of the scars formed on the bark of pine trees damaged by forest fire was carried out in the burned area of Samchuk and Donghae in 2000. Fire scars were formed on the bark of trees when fire passed by the tree. Fire scarring is usually found on the windward and leeward sides of the tree. Fire spread was analyzed topographically using the fire scars formed at the tree stem. Fire spread was closely related to the shape, slope and direction of the forestland. Four fire direction types are classified according to the shapes of the forestland. The height of the fire scar was higher on the leeward side than on the windward side of the trees studied. The burnt area of the total bark of the tree was over 30% in dead trees and below 12% in living trees. The regression model of the burnt stem area using the height of the fire scar, the diameter of breast height and the height of tree was Y=-2.484${\times}$Height＋0.04199${\times}$D.B.H-1.686${\times}$Windward＋11.172${\times}$Leeward＋23.432(r=0.936, F=409.968, P＞0.0001).

• Journal of Navigation and Port Research
• /
• v.46 no.4
• /
• pp.338-343
• /
• 2022

As the revitalization of the global maritime industry continues, the number of foreign ships navigating the maritime territories of maritime neighboring countries has rapidly increased. However, large-scale marine accidents have occurred, caused by the insufficient establishment of a system for management and operation relative to vessels' safety-condition. To address that, the IMO has granted the right to exercise port state control, especially for foreign vessels, to countries with jurisdiction over maritime territories with strengthening regulations and guidelines. In particular, the Republic of Korea, as a member of the TOKYO MOU, is conducting PSC, but as of 2020, the proportion of foreign ships was three times higher than that of national ships that called in domestic ports. However, the inspection rate was low at 9% which has not met the recommended level by the TOKYO MOU. Thus, this study conducted an IPA analysis as well as content analysis, by collecting the practical opinions and views of PSCO through objective questionnaires and written expert interviews, for improving the efficiency and effectiveness of domestic PSC. As a result, it was derived that the importance and performance related to human factors such as life on board, working environment, and response to safety accidents should be improved in to raise the quality of PSC inspection. Additionally, the work environment and performance of PSC in domestic ports for foreign vessels could be improved, if multifaceted support bases are established, for administrative unification of related tests for PSC, recruitment of PSCO, activation of the defection-reporting system, reorganization of the PSC execution group, etc.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.38A no.5
• /
• pp.393-400
• /
• 2013

In conventional single-tier networks, downlink based association is the best association scheme for the uplink association because all macro base stations have the same physical specification. However, in uplink heterogeneous cellular networks, a downlink based cell association cannot be the best for uplink any more because of the difference of physical specification between the different base station. In this paper, we will propose a uplink based cell association scheme, and devise performance metric for describing a uplink performance in heterogeneous cellular networks. Then, we will discuss the necessity of the uplink based association by observing outage probability, delay constraint outage probability, delay constraint outage capacity.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.39 no.10
• /
• pp.946-951
• /
• 2011

This paper presents the simulation results of GBAS availability and requirement (with respected to Vertical Protection Level) using simulated data at CAT I, CAT II/III DH point (Decision Height), which are generated using Jeju international GNSS reference position, aircraft horizontal velocity and reference/aircraft GNSS antenna performance index and so on. Two kinds of protection levels are presented, one is from a hypothesis (H0) and other is from a alternative hypothesis (H1). These protection levels are compared with AL (Alert Limit), and we analyse the GBAS availability and requirement for CAT I and CAT II/III at the airport.

• Journal of Korea Water Resources Association
• /
• v.30 no.6
• /
• pp.611-620
• /
• 1997

The history of Tidal Bench Mark(TBM) at four major tide observation stations on the the Korea West Coast is reviewed. The data concerned with the local mean sea level(LMSL), the datum level(DL), and TBM is collected and checked. The values of LMSL surveyed by Rural Development Corporation(RDC), Office of Hydrographic Affair(OHA), and Office of Port Affair(OPA) are compared so that their unbiased MSLs at four stations are determined. Kriging model is introduced to estimate the design levels for tide; DL, MSL, and high water spring tide(HWOST). The estimated design level is well fitted with the sample data. The value of the identified drifts increase with the latitude. The estimated semi-variograms ${\gamma}(h)$ show self similarity. The values of the ${\gamma}(h)$ for DL and HWOST are 0.005 times as much as the values of ${\gamma}(h)$ of MSL.

• Journal of Navigation and Port Research
• /
• v.37 no.3
• /
• pp.263-267
• /
• 2013

This paper describes the progress and the plan of 'Wide Area Differential GPS (WA-DGPS) Development' project supported by Korean Ministry of Oceans and Fisheries. The project develops the main algorithms of the WA-DGPS which guarantees the improved accuracy, availability, and integrity all over the Korean peninsula. After the establishment of WA-DGPS ground infrastructure system, a real-time demonstration using pseudolite installed on the ground will be conducted in the final year. Also, the development of Korean Satellite-based Augmentation System (SBAS) is expected to be started from 2014, and the algorithms and the results in the WA-DGPS project will be used in the SBAS development.