• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2004년도 춘계 종합학술대회 논문집
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• pp.377-384
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• 2004

필드 기반 영상 모핑은 제어선을 지정하는 과정의 대부분을 사용자의 수작업에 의존하기 때문에 작업 시간이 많이 소요될 뿐만 아니라 양질의 결과를 얻기 위해서는 숙련을 요하는 불편함이 있다. 본 논문은 소스 영상과 목표 영상에서 모핑 대상체 쌍의 형상 정보를 획득한 상태에서 사용자가 수동으로 최소한의 특징점 쌍만을 지정하면 이렇게 지정된 특징점 쌍을 기준 삼아 다각형 기반 정점 탐색에 의해 소스 영상파 목표 영상에 상호 대응되는 제어선들을 자동적으로 설정한 후, 제어선 길이의 비율과 제어선으로부터의 이격 거리를 이용하여 영상 모핑을 수행함으로써 영상 모핑의 반자동화를 실현할 수 있는 방법을 제안한다. 제안된 방법에 따르면, 사용자가 제어선을 설정하는 시간을 단축할 수 있고 비숙련자도 최소의 제어선만을 지정하여 자연스러운 로핑 결과를 획득할 수 있는 이점이 있다.

• 한국군사과학기술학회지
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• 제8권4호
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• pp.110-119
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• 2005

In this paper, a new detection algorithm was proposed for finding the position of lenslet array spot pattern used to acquire laser wavefront. Based on the analysis of the required signal processing characteristics, we categorized into and designed four main signal processing functions. The proposed was designed in order to have robust feature against a variation of geometrical form of the spot and also implemented to have semi-automatic thresholding capability based on CCD noise analysis. For performance evaluation, we made qualitative and quantitative comparisons with Carvalho's algorithm which has been published in recent. In the given experimental spot images, the proposed could detect the spots which has 1/3 times lower than the least S/N of which Carvalho's can detect and could reach to a detection precision of 0.1 pixel at the S/N. In functional aspect, the proposed could separate all valid spots locally. From these results, the proposed could have a superior precision of location detection of spot pattern in wider S/N range.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2005년도 제30회 춘계학술대회
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• pp.47-50
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• 2005

The aim of radiosurgery cures a patient to deliver the lower dose at the normal organ and the higher dose at the tumor. Therefore accuracy of the dose is required to gain effect of radiosurgery in surgical planning. In this paper, we developed the methods of target approximation for a fast treatment planning. Nominally, the stereotactic radiosurgery(SRS) using Linac and Gamma knife produces spherical dose distribution through circular collimators using multiple arcs and 201 holes on semi-spherical helmet by $^{60}Co$. We developed an automatic radiosurgical plan about spherical packing arrangement. To automatically plan the SRS, new planning methods based on cylinder and cube structure for target shaping was developed. This approach using heuristic and stochastic algorithm is a useful radiosurgical plan without restrictions in the various tumor shapes and the different modalities.

• 한국생산제조학회지
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• 제7권5호
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• pp.53-58
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• 1998

This paper concentrates on the development of a computational design program to determine nozzle size in water jet, combing the numerical optimization technique with the flow analysis code. To achieve the above objective, a two-dimensional model was developed for investigating the fluid flow in water jet and calculating the velocity and pressure distributions. The mathematical formulation as a standard ${k}-\varepsilon$ model was solved employing a general thermo fluid-mechanics computer program, PHOENICS code, which is based on the Semi-Implicit Method Pressure Linked Equations(SIMPLE) algorithm. The developed code was applied to water jet design to determine the nozzle size, and investigated the effect of the change of nozzle location. Calculated results showed that the flow pattern is not changed as the change of nozzle location.

• 한국의류학회지
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• 제32권8호
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• pp.1226-1232
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• 2008

Tight fitting glove pattern is necessary to convey oscillation to the skin from the sensors attached on the hands as found in the haptic device. However, it has been difficult to provide customized glove pattern for haptic device so far. The objective of the paper is to develop a 2D pattern that fit tightly to hands by adopting the recent 3D technology to the clothing science. In this study, the user graphic interface application software(2C-AN) for the semi-automatic garment pattern generation has been utilized to develop the methodology of construct tight-fitting glove pattern for the hand in natural position. A basic pattern was developed directly from the 3D images of hand and the verification of the proposed pattern was also provided.

• 인터넷정보학회논문지
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• 제3권2호
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• pp.39-56
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• 2002

데이터베이스를 사용하여 분산된 환경에서 많은 응용이 구축되어감에 따라 지역 데이터베이스의 자치성은 유지하면서 데이터베이스들을 상호 공유하는 데이터웨어하우징, 데이터마이닝 등의 응용이 많이 늘고 있다. 이러한 응용의 첫 번째 요구사항은 이질의 데이터베이스 스키마 통합이다. 기존의 데이터베이스 스키마 통합은 통합을 위한 스키마 공통 모델의 부재, 스키마 통합 프로그램의 복잡성으로 어려움을 겪어 왔다. 본 연구는 XML Schema를 데이터베이스 스키마 통합을 위한 공통된 데이터모델로 사용하여 데이터 모델을 표준화하고, 스키마 통합을 위한 연산들을 정의하여 이를 XSLT로 대응시킴으로써 스키마 통합 자동화 프로그래밍의 복잡성을 해결하며, 스키마 충돌 유형에 따라 통합하는 방법을 제시하였다. 제시된 방법은 기존의 통합 모델에 비하여 표준화, 확장성 등의 장점을 갖는다.

• 한국전자파학회논문지
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• 제11권4호
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• pp.582-591
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• 2000

본 논문에서는 휴대전화기에 의한 인체 영향을 FDTD (시간영역 유한차분법) 해석할 수 있도록 한국인 표준 에 알맞는 인체 두부의 FDTD 모텔 제작 방법을 소개하였다. 한국인 표준에 알맞은 사람의 두부를 MRI 촬영한 다음.2차원 MRI 영상 데이터를 이용하여 2차원 segmentation을 하였다. segmentation은 반자동법을 적용하였 으며 제작된 2차원 se밍nentation 데이터를 토대로 $1mm\times1mm\times1mm$크기의 3차원 고해상도 segmentation 데이터를 제작하였다. 3차원 고해상도 segmentation 데이터를 이용하여 휴대전화기의 사용 상황에 어올리도록 다양한 각도로 기울인 인체 두부의 FDTD 모델을 제작하였다.

• Journal of Welding and Joining
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• 제34권2호
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• pp.11-15
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• 2016

FE analyses for weldment of ship structure are required for various reasons such as stress concentration for bead tow, residual stress and distortion after welding, and hydrogen diffusion for prediction of low temperature crack. These analyses should be done by solid element modeling, but most of ship structures are modeled by shell element. If we are able to make solid element in the shell element FE modeling it is easily to solve the requirement for solid elements in weld analysis of large ship structures. As the nodes of solid element cannot take moments from nodes of shell element, these two kinds of element cannot be used in one model by conventional modeling. The PSCM (Perpendicular shell coupling method) can connect shell to solid. This method uses dummy perpendicular shell element for transferring moment from shell to solid. The target of this study is to develop a FE pre-processing system applicable at welding at ship structure by using PSCM. We also suggested glue-contact technique for controlling element numbers and element qualities and applied it between PSCM and solid element in automatic pre-processing system. The FE weldment modeling through developed pre-processing system will have rational stiffness of adjacent regions. Then FE results can be more reliable when turn-over of ship-block with semi-welded state or ECA (Engineering critical assessment) of weldment in a ship-block are analyzed.

• 대한의용생체공학회:의공학회지
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• 제17권1호
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• pp.109-120
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• 1996

Cardiac function is evaluated quantitatively using angiographic images via the analysis of the shape change or the heart wall boundaries. To kin with, boundary defection or ESLV(End Systolic Lert Ventricular) and EDLV(End Diastolic Left Ventricular) is essential for the quantitative analysis of cardiac function. The boundary detection methods proposed in the past were almost semi-automatic. Intervention by a knowledgeable human operator was still required Of con, manual tracing of the boundaries is currently used for subsequent analysis and diagnosis. This method would not cut excessive time, labor, and subjectivity associated with manual intervention by a human operator. EDLV images have noncontiguous and ambiguous edge signal on some boundary regions. In this paper, we propose a new method for automated detection of boundaries in noncontiguous and ambiguous EDLV images. The boundary detection scheme which based on a priori knowledge information is divided into two steps. The first step is to detect the candidate edge points of EDLV using ESLV boundaries. The second step is to correct detected boundaries of EDLV using the LV shape. We developed the algorithm of modifying EDLV boundaries defined adaptive modifier. We experimented the method proposed in this paper and compared our proposed method with the manual method in detecting boundaries of EDLV. In the areas within estimated boundaries of EDLV, the percentage of error was about 1.4%. We verified the useflilness and obtained the satisfying results througll the experiments of the proposed method.

• Journal of Ecology and Environment
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• 제41권5호
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• pp.142-144
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• 2017

In recent decades, as it becomes increasingly important to monitor and research long-term ecological changes, worldwide attempts are being conducted to integrate and manage ecological data in a unified framework. Especially domestic ecological data in South Korea should be first standardized based on predefined common protocols for data integration, since they are often scattered over many different systems in various forms. Additionally, foreign ecological data should be converted into a proper unified format to be used along with domestic data for association studies. In this study, our interest is to integrate ECN data with Korean domestic ecological data under our unified framework. For this purpose, we employed our semi-automatic data conversion tool to standardize foreign data and utilized ground beetle (Carabidae) datasets collected from 12 different observatory sites of ECN. We believe that our attempt to convert domestic and foreign ecological data into a standardized format in a systematic way will be quite useful for data integration and association analysis in many ecological and environmental studies.