• EDISON SW 활용 경진대회 논문집
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• 제3회(2014년)
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• pp.446-449
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• 2014

Carbon Nanotube (CNT) have been intensively investigated since they have been considered as building blocks of nanoscience and nanotechnology. Theoretical and computational studies on CNTs have revealed their physical and chemical properties and helped researchers build various experimental devices to study them in depth. However, there have been only few systematic studies on detailed changes in electronic structures of CNTs due to geometrical structure modifications. In this regard, it is necessary to perform systematic investigations of the modifications in electronic structures of CNTs, as their geometrical configurations are altered, using the first-principles density functional theory. In other words, it is essential to determine the true equilibrium structure of CNTs. In this work, we considered the different atomic configurations by maintaining their symmetries, but changing all the inequivalent bonding types one by one. Furthermore, as for CNTs, for example, the way the graphene sheet is wrapped is represented by a pair of indices (n,m) and electronic structures of CNTs vary depending on different indices. Our results suggest all the significant couplings between electronic and geometric structures in CNTs.

• 대한전기학회논문지:전력기술부문A
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• 제48권1호
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• pp.76-81
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• 1999

The degree of relative similarity between 2D patterns is obtained using Open-Ball Scheme. Open-Ball Scheme employs a method of transforming the geometrical information on 3D objects or 2D patterns into the features to measure the relative similarity for object(patten) recognition, with invariance on scale, rotation, and translation. The feature of an object is used to obtain the relative similarity and mapped into [0, 1] the interval of real line. For decades, Moment-Invariant Method has been used as one of the excellent methods for pattern classification and object recognition. Open-Ball Scheme uses the geometrical structure of patterns while Moment Invariant Method uses the statistical characteristics. Open-Ball Scheme is compared to Moment Invariant Method with respect to the way that it interprets two-dimensional patten classification, especially the paradigms are compared by the degree of closeness to human's intuitive understanding. Finally the effectiveness of the proposed Open-Ball Scheme is illustrated through simulations.

• 호남수학학술지
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• 제29권1호
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• pp.75-81
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• 2007

The Fisher information matrix plays a significant role in statistical inference in connection with estimation and properties of variance of estimators. In this paper, the parameter space of the normal distribution using its Fisher's matrix is defined. The Riemannian curvature and J-divergence to parameter space are calculated.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.423-425
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• 2003

In this paper, we propose a new scheme for matching specified areas in a satellite image, which is a very efficient method because it can be effectively applied to images that have various features. These features may include different spatial resolution and brightness; sometimes they may different geometrical property. The proposed method can be applied to some application fields such as mosaicing of satellite imagery, GCP matching.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1997년도 추계학술대회 학술발표 논문집
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• pp.237-240
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• 1997

This paper is to arrange systematically the geometrical & physical data for real ships and to develop the graphic user interface program for initial hull design using NFHFD, which save the distributed information about hull form database and can output multi-variables.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 춘계종합학술대회 A
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• pp.527-530
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• 2008

디지털 워터마크 기법은 1990년대 초 지적 창작물(음악, 영상, 동영상)에 대한 저작권과 재산권의 보호 및 인증, 데이터 손실 여부 판단, 복사 방지 및 추적 등을 목적으로 한 사후 재산전의 보호기술로 제안되었다. 본 연구에서는 의료 영상 정보에서 발생할 수 있는 기하학적 변환과 압축 등의 영상 변환에서도 워터마크의 견고성을 확인할 수 있는 워터쉐드 분할 알고리즘을 적응한 견고한 워터마킹기법을 제안하였다. 견고한 워터마컴 기법은 의료 영상에 대한 압축, 필터링, 노이즈와 같은 공격에 보다 견고한 몇 개의 알고리즘을 적용하였다.

• 한국정보처리학회논문지
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• 제5권4호
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• pp.1074-1082
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• 1998

현재 시판중인 비데오는 두개 또는 그 이상의 헤드가 호전하는 드럼에 장착되어 비데오 신호를 기록 또는 재생하고 있다. 대량 생산시 비데오의 일정한 품질관리를 얻기위해서는 드럼에 장착된 헤드의 기하학적 그리고 전기적 특성이 같은 것이어야 한다. 본 연구에서는 헤드의 기하학적 형상을 대별하는 네가지 검사항목 H0, H1, Tw, CW을 자동으로 측정하는 화상기법을 이용한 영상처리알고리즘에 관하여 기술하였다. 1000개의 헤드에 대하여 실험한 결과 현장에 적용할 수 있는 성능을 보였다.

• BMB Reports
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• 제44권2호
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• pp.118-122
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• 2011

Most widely used secondary structure assignment methods such as DSSP identify structural elements based on N-H and C=O hydrogen bonding patterns from X-ray or NMR-determined coordinates. Secondary structure assignment algorithms using limited $C{\alpha}$ information have been under development as well, but their accuracy is only ~80% compared to DSSP. We have hereby developed SABA (Secondary Structure Assignment Program Based on only Alpha Carbons) with ~90% accuracy. SABA defines a novel geometrical parameter, termed a pseudo center, which is the midpoint of two continuous $C{\alpha}s$. SABA is capable of identifying $\alpha$-helices, $3_{10}$-helices, and $\beta$-strands with high accuracy by using cut-off criteria on distances and dihedral angles between two or more pseudo centers. In addition to assigning secondary structures to $C{\alpha}$-only structures, algorithms using limited $C{\alpha}$ information with high accuracy have the potential to enhance the speed of calculations for high capacity structure comparison.

• 한국정보통신학회논문지
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• 제6권4호
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• pp.624-631
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• 2002

본 논문에서는 이진영상 데이터의 저작권 보호를 위한 디지털 워터마킹 방법을 제안하였다. 제안 방법은 먼저 이진영상을 기하학적 특징이 포함된 특징영역과 그 외의 일반영역으로 분리한다. 그리고 기하학적 특징이 포함된 이진영상의 특징영역을 보존하면서 인증을 위한 워터마크를 일반영역에만 삽입, 검출하는 효과 적인 워터마킹 방법을 연구하였다. 특징영역은 특수런을 사용한 런길이부호화를 이용하여 일반영역과 분리하였다. 워터마크의 비가시성을 위해 워터마크는 일반영역중에서 화소변화에 대한 민감도를 고려하여 삽입하였다. 제안 방법을 문자, 서명, 도장, 지문영상에 적용하여 성능을 평가하였다. 실험 결과 제안 방법은 원영상의 중요한 특징영역을 보존하고, 또한 워터마킹된 영상의 비가시성이 높음을 알 수 있었다.

• 산업공학
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• 제18권3호
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• pp.247-252
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• 2005

In the automated production environment in the present days, the minimization of manual operation becomes a very important factor in increasing the efficiency of the production system. The exit burr produced through the milling operation on the edge of workpiece usually requires manual deburring process to enhance the level of precision of the resulting product. So far, researchers have developed various methods to understand the formation of exit burr in cutting process. One method to analytically identify the formation of exit burr was to use the geometrical information of CAD and CAM data used in automated machining. This method, in turn, generated the information resulting from the analysis such as burr type, cutting region, and exit angle. Up to now, the geometrical data were restricted to the single feature and single path. In this paper, a method to deal with the complicated geometric features such as line segment, arc, hole, and spline will be presented and validated using the field data. This method also deals with the complex workpiece shape which is a combination of multiple features. As for the cutting path, multiple tool path is analyzed in order to simulate the real cutting process. All this analysis is combined into a Windows based software and real data are used to validate the program in the conclusion.