• 정보처리학회논문지D
• /
• 제13D권2호
• /
• pp.223-234
• /
• 2006

분기 및 병합은 대규모 소프트웨어 개발에 있어 병렬개발을 지원할 수 있는 소프트웨어 형상관리의 대표적인 기법이다. 상업적인 용도로 쓰이는 기존의 소프트웨어 병합은 문자적 병합에만 의존하고 의미를 고려하지 않아 병합결과에서 의미적 오류를 발생시킬 수 있다. 현재까지 의미적 병합충돌 탐지 및 병합에 대한 연구가 이루어지고 있으나 의미적 병합충돌 및 병합에 대해서만 개별적으로 이루어지고 있으므로, 문자적 병합과정에서 의미적 충돌을 탐지하고 해결할 수 있는 기법에 대한 연구가 필요하다. 본 논문에서는 프로그램 원본에서 분기된 두개의 프로그램들을 병합하는데 있어서 그들 각각의 원본에 대한 각 라인별 수정, 삭제, 삽입 오퍼레이션들을 정의하여 병합과정에서 발생하는 문자적 충돌 및 실행행위에 관련된 의미적 충돌을 탐지하고 해결하여 병합하는 문자적 병합기법과 의미적 병합기법을 결합한 하이브리드 병합기법을 제시하였다.

• Journal of Electrical Engineering and Technology
• /
• 제9권6호
• /
• pp.1954-1959
• /
• 2014

This paper attempts to design and present a comparison of classical Direct Torque Flux Control (DTFC) for Line-Start Permanent Magnet Synchronous Motor (LSPMSM) and its equal Permanent Magnet Synchronous Motor (PMSM). In order to present an in-depth analysis, both motors for DTFC Voltage Source Inverter (VSI)-fed in the same situations of different conditions are simulated and tested. The advantages of the proposed method for LSPMSM over the PMSM are discussed and analyzed.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 학술대회 논문집 전문대학교육위원
• /
• pp.62-67
• /
• 2004

In this paper, we present the new method for joint aspect inspecting system. We use the image processing and laser maker for light source. We can find the matrial joint status through processing the line pattern which is made by laser maker. To get the line pattern, in first, we had done the preprocss of threshold. If the shape of line had over two segments, then the joint status is abnormal. We show our system efficency by experiment on tire facility.

• 한국ITS학회 논문지
• /
• 제9권5호
• /
• pp.67-71
• /
• 2010

본 논문에서는 L-형 회로구조에 기반한 새로운 이중대역 임피던스 변환기를 제안한다. 제안된 회로는 전원 또는 부하단에 하나의 스터브 선로가 부착된 전송선로를 사용하여 구성된다. 각 회로 구조와 부하조건에 대해 이중대역 동작조건을 자세히 분석하였으며 이로부터 선로의 길이와 임피던스 등의 이중대역 설계 공식을 간단한 형태로 유도하였다. 제안된 방법을 이용하여 이중대역 임피던스 정합회로를 설계하고 마이크로스트립 회로로 제작, 측정하여 이중대역 동작을 확인하였다.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
• /
• pp.643-646
• /
• 2002

Sealing of two glass plates composing of PDP panel was done in a vacuum chamber by using an auxiliary heating line(AHL). In order to improve the uniformity of sealing temperature and reduce the panel temperature during sealing, the AHL was introduced by a screen printing method inside a frit glass and used as a part of heating source for the frit melting. By using the AHL technology and the specially prepared frit glass, we have successfully sealed a PDP test panel without bubbles and any leak through the frit glass.

• 한국기계가공학회지
• /
• 제9권5호
• /
• pp.70-75
• /
• 2010

In this paper, laser marking systems dedicated to cylinderical parts was developed. We first develop the marking device which consists of Nd-Yag laser, galvano scanner and additional rotational axis, then develop algorithm for supporting the digital image with bmp data format. Additional rotational axis is so attached as to rotate the cylinderical parts for marking its whole surface. The image is separated into line by line and the separated line image is sent to galvano scanner while rotating the additional axis simultaneously. CxImage library, famous open source code, is employed for the image processing. The developed method was tested with various images and shows that it reduces marking time significantly without reducing marking quality.

• 한국통신학회논문지
• /
• 제22권6호
• /
• pp.1259-1265
• /
• 1997

삼각측량의 원리를 이용하 거리 탐색기를 사용하여 거리 영상을 취득하는 경우에 발생하는 측정오차를 직관적으로 이해할 수 있도록 기하학적 방법으로 분석하였다. 그 결과로 추정 오차는 카메라에서 물체까지의 거리에 비례하는 것을 보였다. 또한 카메라 초점과 물체를 지나는 직선이 광원과 물체를 연결하는 직선과 직각인 경우 측정값이 가장 정밀한 것을 보였다. 또한 이 결과가 해석학의 기법을 사용하여 분석한 결과와 일치함을 보였고 실험을 통하여 이를 확인하였다. 본 연구 결과는 동일한 카메라가 광원을 사용한 경우에도 카메라의 방향과 물체까지의 거리를 변화시켜서 측정 정밀도를 향상시킬 수 있다는 것을 보인다.

• Nuclear Engineering and Technology
• /
• 제53권10호
• /
• pp.3314-3318
• /
• 2021

This paper presents a mode-matching analysis of the electromagnetic coupling between open cable trays in an indoor structure when an electric-line current is generated as an electromagnetic source. We validated the mode-matching method by comparing the mode-matching results with those computed from a commercial electromagnetic simulator and then investigated the strength of the electric-field coupled in a victim cable tray while varying the distances between cable trays and architectural surfaces. The results of this study provide geometrical information on the placement of open cable trays to avoid electromagnetic interference problems.

• Nuclear Engineering and Technology
• /
• 제53권8호
• /
• pp.2534-2546
• /
• 2021

Nuclear emergency preparedness and response is an essential part to ensure the safety of nuclear power plant (NPP). Key support technologies of nuclear emergency decision-making usually consist of accident diagnosis, source term estimation, accident consequence assessment, and protective action recommendation. Source term estimation is almost the most difficult part among them. For example, bad communication, incomplete information, as well as complicated accident scenario make it hard to determine the reactor status and estimate the source term timely in the Fukushima accident. Subsequently, it leads to the hard decision on how to take appropriate emergency response actions. Hence, this paper aims to develop a method for rapid source term estimation to support nuclear emergency decision making in pressurized water reactor NPP. The method aims to make our knowledge on NPP provide better support nuclear emergency. Firstly, this paper studies how to build a Bayesian network model for the NPP based on professional knowledge and engineering knowledge. This paper presents a method transforming the PRA model (event trees and fault trees) into a corresponding Bayesian network model. To solve the problem that some physical phenomena which are modeled as pivotal events in level 2 PRA, cannot find sensors associated directly with their occurrence, a weighted assignment approach based on expert assessment is proposed in this paper. Secondly, the monitoring data of NPP are provided to the Bayesian network model, the real-time status of pivotal events and initiating events can be determined based on the junction tree algorithm. Thirdly, since PRA knowledge can link the accident sequences to the possible release categories, the proposed method is capable to find the most likely release category for the candidate accidents scenarios, namely the source term. The probabilities of possible accident sequences and the source term are calculated. Finally, the prototype software is checked against several sets of accident scenario data which are generated by the simulator of AP1000-NPP, including large loss of coolant accident, loss of main feedwater, main steam line break, and steam generator tube rupture. The results show that the proposed method for rapid source term estimation under nuclear emergency decision making is promising.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2009년도 춘계학술대회 논문집
• /
• pp.490-495
• /
• 2009

An approach to 3D visualization of multiple sound sources has been developed with the application of a moving array technique. Frequency-domain beamforming algorithm is used to generate a beam power map and the sound source is modeled as a point source. When a conventional delay and sum beamformer is used, it is considered that 2D distribution of sensors leads to have deficiency in spatial resolution along a measurement distance. The goal of moving an array in this study is to form 3D array aperture surrounding multiple sound sources so that the improved spatial resolution in a virtual space can be expected. Numerical simulation was made to examine source localization capabilities of various shapes of array. The 3D beam power maps of hemispherical and spherical distribution are found to have very sharp resolution. For experiments, two sound sources were placed in the middle of defined virtual space and arc-shaped line array was rotated around the sources. It is observed that spherical array show the most accurate determination of multiple sources' positions.