• Bulletin of the Korean Space Science Society
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• 2010.04a
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• pp.28.2-28.2
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• 2010

영상레이더 위성으로부터 획득된 SAR 영상의 상대적/절대적 방사(radiometric) 정밀도를 만족시키기 위해서는 궤도상에서 검보정을 수행하여야 한다. 일반적으로 상대 방사 정밀도의 보정을 위해서는 아마존 일대와 같이 일정한 지표 반사도를 지니는 넓은 지역을 촬영함으로써, 지상에서 모델링된 안테나 패턴의 이상 유무를 검증한다. 절대 방사 정밀도를 결정하기 위해서는 보정계수(calibration constant)를 구해야 하는데, 이를 위해서 RCS(radar cross section) 값이 기 알려져 있는 지상의 CR(corner reflector)를 관측해야 한다. 대부분의 SAR 위성의 경우, 각 입사각별로 여러 개의 빔(beam)이 독립적으로 운용되고, 위성의 경로가 각 pass 사이 거의 일정한 간격을 가지기 때문에, 지상의 CR들에 대한 빔의 접근성이 상당히 제약을 많이 받게 된다. 즉, 개별 빔이 촬영할 수 있는 CR의 개수 및 동일 CR에 대한 촬영 빈번도가 많이 작을 수 있다는 것을 의미한다. 특히, CR이 빔폭의 중심에서 관측되어야 하는 요구사항이 추가로 반영될 경우 그 빈도수는 더욱더 영향을 받게된다. 이 연구에서는 고도 550 km, 28일의 지상반복주기(repeat ground track)를 가지는 여명 궤도(dawn-dusk orbit)를 가정하고, 각 빔별로 그 빔에 할당된 하나의 CR만을 촬영해야 된다는 조건하에, 빔 접근성의 요구사항을 최대로 만족시킬 수 있는 CR의 좌표들을 구하였다. 동시에, J2항만을 고려한 이상적 28일 지상반복궤도를 적용한 경우와 모든 중력섭동항을 적용한 최적궤도를 적용한 경우를 비교하여, 실질적 검보정 일정을 수립하였다.

• Land and Housing Review
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• v.4 no.2
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• pp.167-176
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• 2013

The City Complex Development and TOD originated from the Compact City are entrenched domestically. The New Urban Development such as these changes Structure of Urban space from the Automobile to the Public Transportation. Also, Transit-Oriented Development is drawing attention as sustainability because it has effects of Environment as Green growth. However, An empirical Study is insufficient about Influence Factors of Transit Oriented Development. Therefore This study sets up the Density spaced 1000m apart of Transit Oriented than the existing and did 7 Types considered of Accessibility, Complexity and Design Element according to the Factorial analysis. As a result, this study drew that (1) 'intraregional accessibility of public transit', (2) 'degree of development', 'pedestrian-friendly facility', (3) 'interzonal accessibility of public transit', (4) 'land-use of the city centre', 'complex using of rail station area', 'complementary public transit' are related 201 in number of the Subway stations according to the Multi-dimensional scaling.

• Journal of the Korean Geographical Society
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• v.43 no.3
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• pp.263-275
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• 2008

This Study deals with the comparative analysis on the estimation of surface soil erosion volume between South and North Korea using RUSLE model in Imjin River basin located on DMZ of Central Korea. Comparatively North Korea areas have been more eroded three times as much as South Korea parts. Because of cropland development such as com Held in the hillslope, in North Korea, more surface soil erosion and transportation to the river bed has given rise to frequent flood hazards. It seems that the study can dedicate to mitigation of environmental problems such as soil erosion and flooding in unaccessible Imjin River basin located on DMZ.

• Journal of the Korean Society of Marine Environment & Safety
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• v.30 no.4
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• pp.340-347
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• 2024

In this study, an expert survey was conducted using the Delphi technique to select items and indicators for evaluation before installing educational facilities in the marine fisheries safety field, in which the educational infrastructure gap between regions is wide. Seven indicators were selected as geographic, social, and administrative factors. In order to objectively evaluate each indicator, evaluation indicators that could be evaluated using public data such as the "Comprehensive National Balanced Development Information System" and "National Statistical Portal" were developed. The Analytic Hierarchy Process (AHP) method was applied to select the weight for each indicator, resulting in 10 most important influencing factors on the selection of the location of educational facilities of the Marine Fisheries Safety Education Facilities: the distribution of marine officers, access to high-speed railways, the number of small ships less than 5 tons, access to highways interchange, the distribution of fishing boats, the close relationship of related industries, the planned new port, the distribution of commercial ports, the number of marine leisure riders, and the availability of long-term land leases in local government councils. The location evaluation index of marine and fishery safety education facilities developed in this study can be used to evaluate each region using national public data, and has the advantage of enabling objective evaluation. Therefore, it is judged that this evaluation index can be used to verify the feasibility of installing marine fisheries safety education facilities as well as other marine-related facilities.

• The Journal of the Korea Contents Association
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• v.13 no.10
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• pp.511-522
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• 2013

The main purposes of this study were eliciting the planning contents and indices that is necessary to consider the physical part of public space, the side of service users and coherent side for improving public service. After then it analyzed the importance in both civil servants and practical officials side. For this public space planning topics and indicators by FGI (Focus Group Interview) derived through and through expert questionnaires Analytic hierarchy (AHP: Analytic Hierachy Process) were analyzed by conducting importance. A result, the priority of public space as a park planning index was found in the case of privately owned public space, public pedestrian pathways, public open space, public facilities land, the park is located, and the most important characteristics of the road, if the public transport association the most important thing is derived. In order to enhance the public good public space and location for easy access to the consideration of whether the plan should be. Therefore this work will be the fundamental materials to make some of farther policies related with the development of public interest of private-public spaces.

• Radioisotope journal
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• v.15 no.3
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• pp.78-92
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• 2000

낮은 선량의 방사선피폭으로 인한 건강 위해의 여부에 대하여 과학적 현황을 고찰하였다. 선량과 영향 사이에 문턱 없는 선형비례 모델(LN-T모델)에 대해 역학적, 수학적, 방사선생물학적 측면의 긍정적 논리와 호메시스, 적응반응, 통계적 관점의 비판적 논거를 대비하여 평가하였다. 방사선 피폭이력자에게 발현한 확률적 영향 특히 백혈병을 포함한 암에 대해 그 질환의 방사선 인과성 판단에 대한 애로와 접근 방향을 논의하였다. 객관적인 평가 지표의 하나로 기인확률(PC)을 적용하되 근로자에 대한 제도적 배려 등 고려할 사항을 논의하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.223-225
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• 2003

본 논문은 서로 다른 두 구조의 캐쉬와 새로운 뱅크선별기를 이용하여, 보다 효율적인 뱅크관리 메커니즘을 응용한 새로운 개념의 캐쉬 구조에 대한 설명을 한다. 크기가 작음에도 불구하고, 낮은 접근 실패율(Miss ratio)와 높은 저전력 효과는 기존의 일반적인 직접사상 캐쉬와 비교했을 때, 성능면에서 월등한 차이를 나타내고 있다. 이러한 결과의 원인은 직접사상 캐쉬와 완전연관 버퍼의 최적화된 구성과. 효과적인 뱅크선별기를 사용하여 적은 전력에도 높은 성능을 발휘하는 새로운 메커니즘을 사용하였기 때문이다. 제안한 구조의 성능은 다양한 크기의 직접사상 캐쉬와 비교하였으며, 접근 실패율, 평균 메모리 접근 시간, 전력소비, Energy * Delay Product 등 모두 4가지의 지표를 사용하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.63-65
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• 2023

한국 경제에 근간이 되는 산업은 제조업이고, 그중 석유화학산업은 전량 원유를 수입하여 우리나라의 기술력으로 가공하여 재수출하는 전략적 성장 산업이다. 수많은 제조업의 원료가 되는 원유를 전량 해상운송을 통해 수입하는 우리나라는 변동성이 심한 유조선 운임 시장에 대해 기민하게 대응해야 한다. 유조선 운임 시장의 위기는 관련 해운회사의 위기에서 끝나지 않고 원유를 사용하는 산업에서부터 국민의 생활까지 영향을 미칠 수 있으므로, 본 연구에서 신호접근법을 활용한 조기경보모형을 제시했다. BDTI 운임지수를 활용하여 유조선 해운시장 위기를 정의하고, 38개의 거시경제, 금융, 원자재 지표 그리고 해운시장 데이터를 활용해 시차상관관계를 분석하여 유조선 해운시장 위기에 선행적으로 반응하는 종합선행지수를 도출했다. 연구 결과, 종합선행지수는 두 달 전 가장 높은 0.499의 시차상관계수 값을 가졌으며, 5개월 전부터 유의미한 상관계수 값을 나타냈다. 더불어 QPS 값은 0.13으로 위기 예측에 대해 높은 정확성을 지니는 것으로 검증됐다.

• Convergence Security Journal
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• v.15 no.3_1
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• pp.91-97
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• 2015

When we estimate any organization, we can use scientific tool such as organizational effectiveness. It is very difficult to know the level of organizational goal. If you plan how to assess the effectiveness of your organization, It is a complex and difficult problem, because a few social scientist think that there are many point of view of an concept of organizational goals based on the relatively concrete concept of organizational effectiveness. Social scientist Campbell insist that it is impossible to estimate organizational effectiveness accurately. So we should develope the perfect method to measure the organization as a system, the member's self satisfaction, the efficiency of the team. To achieve a good organizational effectiveness, we should study the method of approach about organizational effectiveness. This is theoretical study and show that the concept and method of approach about organizational effectiveness.

• Journal of Wetlands Research
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• v.15 no.3
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• pp.367-380
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• 2013

In this study, sub-indicators, and thematic mid-indexes to evaluate the water use characteristics were selected through historical data analysis and factor analysis, and consisted of the subject approach framework. And the integrated index was developed to evaluate water use characteristics of the watershed. Using developed index, the water use characteristics were assessed for 812 standard basins with the exception for North Korea using data of 1990 to 2007 from the relevant agencies. A sensitivity analysis is conducted for this study to determine the proper way through various normalization and weighting methods. To increase the objectivity of developed index, the history of the damage indicators are excluded in the analysis. In addition, in order to ensure its reliability, results from index with and without consideration of the damage history were compared. Also, the index is also applied to real data for 2008 Gangwon region to verify its field applicability. Through the validation process this index confirmed the adequacy for the indicators selection and calculation method. The results of this study were analyzed based on the spatial and time vulnerability of the basin's water use, which can be applied to various parts such as priority decision-making for water business or policy, mitigations for the vulnerable components of the basin, and supporting measures to establishment by providing relevant information about it.