• 한국지리정보학회지
• /
• 제9권4호
• /
• pp.60-70
• /
• 2006

2004년에 실제적인 서비스가 시작된 국토통계지도는 각종 국가 통계를 바탕으로 다양한 정보를 제공하였지만 기존 국토통계지도 시스템은 안정성과 다양한 기능성이 부족하였다. 이를 개선해 2005년에 개선된 국토통계지도 시스템은 기존의 약 8배의 공간데이터를 처리하면서도 단 하나의 통합지도만을 사용하며 다양한 기능을 추가할 수 있는 확장성을 가지고 있으면서 안정성 면에서도 개선 되게 되었다. 여러 사정들로 인해 기존 파일구조 시스템을 근본적으로 개선할 수 있는 데이터베이스관리시스템(DBMS)을 도입할 수는 없었지만 기존 시스템에서 개선된 형태의 파일시스템을 개발하였다. 공간자료와 동적으로 연결되어 각 공간자료들을 각각의 인덱스(연도, 지표, 지역 등)만을 가지는 자료로 독립시켰으며 이를 통해 인덱스 관리, 검색 시스템 등 DBMS에서 기본적으로 사용하는 구조를 파일시스템에 적용할 수 있었다. 공간자료가 각 단위 시스템에 자료를 요청하면 각 시스템 엔진들이 자료를 제공함으로써 새로운 시스템은 향후 DBMS도입을 위한 중간자적인 역할을 수행하게 되었다. 마지막으로 독도를 포함한 우리 지도를 보다 상세히 수정하여 보다 현실적인 국토의 모습을 보여주었다.

• Spatial Information Research
• /
• 제6권1호
• /
• pp.25-33
• /
• 1998

연구대상 지역은 1:50,000지형도 12매(김해, 부산, 밀양, 양산, 방어진, 동곡, 언양, 울산, 영천, 경주, 불국사 및 감포)를 포함하는 지역으로서 총 면적은 약 5,900Km/sup 2/에 이른다. 본 연구서는 4개의 주제도, 즉 산사태 및 불안정사면 분포도, 경사분류도, 토양분류도 및 선구조밀도도의 작성을 다루고 있다. 작성한 4개의 주제도와 GIS를 이용하여 연구지역의 상대적 사면안정성 분류도(축척 1:100,000)를 작성하였는데, 본 도는 광역 토지이용계획에 활용될 수 있다.

• 자원환경지질
• /
• 제33권2호
• /
• pp.117-128
• /
• 2000

Regional evaluations of slope stability by the failure criterion and by environmental geological factors were conducted. The failure criterion is the general conditions for plane failure which consider the geometrical conditions between geological discontinuities and topographical slope planes. The factor focused in this condiction is dip and dip direction. Geostatics, named semivariogram was used for establishing structural domains in slope stability evaluation by the failure criterion. The influential range was calculated to 6 km in the case of dip direction of dominant joint set and 7 km in the case of dip of the same dominant joint set. Then applying this failure criterion to the study area produced a slope stability map using the established domains and slopes generated by TIN module of ARC/INFO GIS. This study considered another regional slope stability analysis. 5 failure-driven factors 9the unstable slope map, geology, engineering soil, groundwater, and lineament density) were selected and used as data coverages for regional slope stability evaluation by geoenvironmental factors. These factors were weighted and overlayed in GIS. From the graph of cumulatave area (%) and instability index, finding critical points classified the instability indices. The most unstable slopes are located in the southern area of Mt. Eorae, Dabul-ri, and the eastern area of Junkok-ri in the first area is plane failure. Also, the expected orientations of failure are 59/338 and 86/090 (dip/dip direction).

• 한국환경복원기술학회지
• /
• 제13권2호
• /
• pp.114-123
• /
• 2010

The Environmental Conservation Value Assessment Map (ECVAM) is a five grade assessment map created with nationally integrated environmental information and environmental values. The map is made through the evaluation of 67 items, including greenbelt area and bio-diversity. The ECVAM assesses the stability of the community using forest maps. However, the existing assessment method is problematic because the assessment grades are evaluated using higher than practical values; in part because it uses even-valued overlay and minimal indicator methods. This study was performed in order to suggest an integrated assessment method that could complement the stability evaluation based on existing methods. Accordingly, this study added forest type information, including whether the forest was natural or artificial, to the overlay method using forest diameter maps and forest density maps. As a result, the proposed ECVAM indicated a drastic grade change. After applying the method in South Korea, Grade I areas decreased 12.1%, from 52.6% to 40.6%, Grade II areas increased 11.9%, from 17.4% to 29.2%, and Grade III areas increased 0.2%, from 17.1% to 17.4%, respectively. From the results of the field survey, we found differences between natural forest and planted forest with regard to the number of mortality, species of shrubs, and vine cover. This means that natural forests are more stable than planted forests. This study suggests an improved assessment methodology to complement the existing EVCAM method. The results are expected to be used in environmental evaluations and forest conservation value assessments in ecology and environmental fields.

• 한국연소학회:학술대회논문집
• /
• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
• /
• pp.153-156
• /
• 2014

This study was aimed to assess combustion stability for coaxial swirl injector and FOOF impinging injector which would be candidates in liquid rocket engine combustors. Simulating combustion tests under atmospheric condition have been conducted by gaseous oxygen and the mixture of methane and propane, using two actual injectors. By analyzing the measured dynamic pressure signals, we have evaluated the combustion stability margin of both injectors by drawing a stability map.

• 한국멀티미디어학회논문지
• /
• 제22권4호
• /
• pp.417-423
• /
• 2019

This paper presents an evaluation system to determine the completeness of a space map obtained by a visual SLAM(Simultaneous Localization And Mapping) algorithm. The proposed system consists of three parts. First, the proposed system detects the occurrence of loop closing to confirm that users acquired the information from all directions. Thereafter, the acquired map is divided with regular intervals and is verified whether each area has enough map points to successfully estimate users' position. Finally, to check the effectiveness of each map point, the system checks whether the map points are identifiable even at the location where there is a large distance difference from the acquisition position. Experimental results show that space maps whose completeness is proven by the proposed system has higher stability and accuracy in terms of position estimation than other maps that are not proven.

• 한국방재안전학회논문집
• /
• 제12권2호
• /
• pp.65-72
• /
• 2019

한국은 국토의 64%이상이 산지로 구성되어 있어 산지재해에 취약한 지형적 특성을 가진다. 연구대상지역인 태백산국립공원 당골유역은 탐방로 대부분이 급경사지와 인접해 있어 집중호우 시 산사태와 토석류에 취약한 지역이다. 본 연구에서는 결정론적 분석방법인 사면안정성 모델을 이용하여 사면재해 발생예측 가능성을 검토하였다. 모델의 매개변수는 정밀토양도의 토양분류에 따라 토질의 단위중량, 유효점착력, 흙의 내부마찰각, 유효토심, 지표경사 등을 이용하였고 1 m격자의 DEM을 바탕으로 사면안정성 평가를 실시하였다. 사면안정성평가 분석결과 지하수/ 유효토심과의 비가 1.0에 가까워질수록 위험지역이 높게 나타났으며, 국립공원 하류지역의 민가와 상업시설 상당수가 위험에 노출된 것으로 나타났다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2000년도 춘계학술대회논문집
• /
• pp.441-448
• /
• 2000

An investigation into the nonlinear free vibrations of a cantilever beam which can have not only planar motion but also nonplanar motion is made. Using Galerkin's method based on the first mode in each motion, we transform the boundary and initial value problem into an initial value problem of two-degree-of-freedom system. The system turns out to have two normal modes. By Synge's stability concept we examine the stability of each mode. In order to check validity of the stability we obtain the numerical Poincare map of the motions neighboring on each mode.

• 대한수학회보
• /
• 제53권4호
• /
• pp.985-1004
• /
• 2016

We consider the MAP/PH/c/K queue in which blocked customers retry to get service and servers may take vacations. The time interval between retrials and vacation times are of phase type (PH) distributions. Using the method of mean drift, a sufficient condition of ergodicity is provided. A condition for the system to be unstable is also given by the stochastic comparison method.

• Journal of applied mathematics & informatics
• /
• 제42권1호
• /
• pp.213-221
• /
• 2024

A family of sixth-order multiple-root solver have been developed and the special case of weight function is investigated. The dynamical analysis of selected iterative schemes with uniparametric polynomial weight function are studied using Möbius conjugacy map applied to the form ((z - A)(z - B))^m and the stability surfaces of the strange fixed points for the conjugacy map are displayed. The numerical results are shown through various parameter spaces.