• 대한공간정보학회지
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• 제8권2호
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• pp.11-22
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• 2000

수자원의 효율적인 관리를 위해서는 유역에 대한 정확한 지형특성 및 수문매개변수를 추출해야 한다. 하지만, 아직까지 수문분야에서 이와 관련된 자료들이 수작업이나 간단한 연산에 의해 처리되고 있는 실정이다. 본 연구에서는 GSIS를 활용하여 유역에 대한 지형특성 및 수문관련 매개변수를 추출할 수 있는 알고리즘을 제시함으로서 자료처리 시간의 절감 및 수문자료에 대한 신뢰성을 높일 수 있었다. 그리고, 추출한 매개변수를 HEC-HMS 수문모형의 입력매개변수로 활용함으로서 GSIS와 수문모형과의 연계방향을 제시하였다. 유역별 지형특성 및 수문관련 매개변수추출 과정은, 먼저 DEM자료로부터 유역 및 하천을 추출하였고, 토지피복도과 토양도를 중첩하여 유출곡선번호(CN)을 추출하였다. 또한 유역과 하천에 격자 연산을 수행하여 최장수로 길이 및 경사와 같은 지형 매개변수를 추출하였다. 그리고 추출한 지형 매개변수와 평균 곡선번호와의 연산과정을 통해 Muskingum K와 소유역 지체시간과 같은 수문관련 매개변수를 추출할 수 있는 기법을 제시하였다.

• 정보처리학회논문지A
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• 제14A권5호
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• pp.263-268
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• 2007

본 논문에서는 Folded 하이퍼-스타 FHS(2n,n)의 위상적 성질들을 분석한다. 먼저, FHS(2n,n)이 최대고장허용도를 가짐을 보이고, double rooted 스패닝 트리를 이용한 방송 수행 시간이 2n-1임을 보인다. 그리고 FHS(2n,n)이 Folded 하이퍼큐브에 연장율 1로 임베딩 가능함을 보이고, Folded 하이퍼큐브가 FHS(2n,n)에 연장율 2, 밀집율 1로 임베딩 가능함을 보인다.

• 전자공학회논문지B
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• 제29B권7호
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• pp.42-51
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• 1992

This paper suggests a measure constraint locus which is the loci of points satisfying the necessary constraint for optimality of a measure in the configuration space. The characterization of four measures for singularity avoidance is worked out by using the measure constraint locus. It gives a global look at the performance of an inverse kinematic algorithm whien each of measures in a kinematically redundant robot is used. The invertible workspace without singularities and the topological properties both on the configuration and operational spaces are analyzed. We discuss also some limitations, based on the topological arguments of measure constraint locus, of the inverse kinematic algorithms, and compare global properties of each of measure. Therfore, a new concept called measure constraint locus gives a methodology for obtaining a conservative joint trajectory without singularities for almost entire workspace.

• 한국CDE학회논문집
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• 제5권4호
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• pp.293-300
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• 2000

The non-manifold geometric modeling technique is to improve design process and to Integrate design, analysis, and manufacturing by handling mixture of wireframe model, surface model, and solid model in a single data structure. For the non-manifold geometric modeling, Euler operators and other high level modeling methods are necessary. Boolean operation is one of the representative modeling method for the non-manifold geometric modeling. This thesis studies Boolean operations of non-manifold model with the data structure of selective storage. The data structure of selective storage is improved non-manifold data structure in that existing non-manifold data structures using ordered topological representation method always store non-manifold information even if edges and vortices are in the manifold situation. To implement Boolean operations for non-manifold model, intersection algorithm for topological cells of three different dimensions, merging and selection algorithm for three dimensional model, and Open Inventor(tm), a 3D toolkit from SGI, are used.

• 대한전자공학회논문지
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• 제11권1호
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• pp.47-51
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• 1974

목론문은 회로망해석의 첫 과정으로 필요로 하는 주어진 회로의 수본과 보목을 구체적으로 생성하는 위상수학적방법을 연구하려고 노력했고 또한 다른 방법들과의 효률을 비교한 예를 제시했다. 이 결과는 다른 어떤 방법들보다 더욱 효률적이고 전기회로망의 위상수학적 해석에 있어서 근본적인 역할를 할 것으로 믿는다.

• 전자공학회논문지B
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• 제28B권10호
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• pp.761-770
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• 1991

This paper suggests a measure constraint locus for characterization of the performance of a subtask for a redundant robot. The measure constraint locus are the loci of points satisfying the necessary constraint for optimality of measure in the joint configuration space. To uniquely obtain an inverse kinematic solution, one must consider both measure constraint locus and self-motion manifolds which are set of homogeneous solutions. Using measure constraint locus for maniqulability measure, the invertible workspace without singularities and the topological property of the configuration space for linding equilibrium configurations are analyzed. We discuss some limitations based on the topological arguments of measure constraint locus, of the inverse kinematic algorithm for a cyclic task. And the inverse kinematic algorithm using global maxima on self-motion manifolds is proposed and its property is studied.

• 천문학회보
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• 제44권2호
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• pp.53.2-53.2
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• 2019

The genus of the matter density eld, as traced by galaxies, contains information regarding the nature of dark energy and the fraction of dark matter in the Universe. In particular, this topological measure is a statistic that provides a clean measurement of the shape of the linear matter power spectrum. As the genus is a topological quantity, it is insensitive to galaxy bias and gravitational collapse. Furthermore, as it traces the linear matter power spectrum, it is a conserved quantity with redshift. Hence the genus amplitude is a standard population that can be used to test the distance-redshift relation. In this talk, I present measurements of the genus extracted from the SDSS DR7 LRGs in the local Universe, and also slices of the BOSS DR12 data at higher redshift. I show how these combined measurements can be used to place cosmological parameter constraints on m, wde.

• East Asian mathematical journal
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• 제17권2호
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• pp.217-224
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• 2001

In this paper, we introduce the notion of some modification of given convergence structure and product convergence. Also, we find some properties which hold between the modification associated with a product of convergence structures and the product of modifications associated with the factor convergence structures.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2001년도 가을 학술발표논문집 Vol.28 No.2 (1)
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• pp.166-168
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• 2001

3D GIS(Geographical Information System)은 2D GIS를 고도값을 고려한 3D 공간으로 확장한 GIS System이다. 3D GIS는 기존의 2D와는 다른 Data Format을 기반으로 훨씬 다양한 기능을 지원하는 Operation들을 제공한다. 본문에서는 각 노드들의 상관 관계를 묘사하는 데 장점을 가진 Topological Data Model에 대해 알아보고, 이 모델에서 지원이 가능한 여러 가지의 3D Operation들을 알아보고 도시내의 다양한 상황하에서 기능을 지원 할 수 있도록 한다.

• 한국환경과학회지
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• 제22권5호
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• pp.543-554
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• 2013

Acoustic Doppler Current Profilers (ADCPs) are increasingly popular in the river research and management communities being primarily used for estimation of stream flows. ADCPs capabilities, however, entail additional features that are not fully explored, such as morphological representation of river or reservoir bed based upon multi-beam depth measurements. In addition to flow velocity, ADCP measurements include river bathymetry information through the depth measurements acquired in individual 4 or 5 beams with a given oblique angle. Such sounding capability indicates that multi-beam ADCPs can be utilized as an efficient depth-sounder to be more capable than the conventional single-beam eco-sounders. The paper introduces the post-processing algorithms required to deal with raw ADCP bathymetry measurements including the following aspects: a) correcting the individual beam depths for tilt (pitch and roll); b) filtering outliers using SMART filters; d) transforming the corrected depths into geographical coordinates by UTM conversion; and, e) tag the beam detecting locations with the concurrent GPS information; f) spatial representation in a GIS package. The developed algorithms are applied for the ADCP bathymetric dataset acquired from Han-Cheon in Jeju Island to validate themselves applicability.