• 한국항공우주학회지
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• 제45권3호
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• pp.191-193
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• 2017

EFD-CFD 비교워크샵은 AIAA의 Drag Prediction Workshop과 High Lift Prediction Workshop을 참고하여 국내의 풍동실험과 전산해석기술 수준을 향상시키고 두 분야의 협력을 통해 공기역학의 기술수준을 고양하고자 조직되었다. 국내외에서 수행된 3개의 풍동실험 Case에 대한 전산해석 수행 및 비교분석을 수행하며 2015년부터 비교 워크샵이 개최되고 있다. 향후 국내 연구자들의 참여와 협력을 적극 유도하며 새로운 형상에 대한 실험과 해석 및 분석을 진행하여 국내 공기역학의 기술발전에 기여하고자 한다.

• 전력전자학회논문지
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• 제17권2호
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• pp.129-134
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• 2012

In this paper, a new simple PWM method for Vienna rectifier is proposed. The previous SVPWM method for Vienna rectifier is very complex and difficult to implement. To solve these problems, a new single-carrier comparison PWM method for voltage control of Vienna rectifier is proposed. Because of using the only single carrier, implementation of the proposed PWM is very simple. In the proposed PWM method, carrier comparison parts of the PWM block is only changed from the 2 level PWM control block. The usefulness of the proposed PWM method is verified by the simulation and experiment.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 추계학술대회 논문집
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• pp.303-306
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• 2008

This study proposes an essential process of type certificate, which is load comparison for proving the calculated design load. The load measurement was carried out according to IEC 61400-13 standard and the load calculation was performed with same condition using FLEX 5 code. For more accurate load simulation, the controller parameter of original model at the design stage was modified to site optimized value and some node points are added to coincidence with measurement. The load comparison was performed with various wind parameter, turbulence intensity and wind shear. As a result, simulated loads ware good agreed with the measured load. Therefore, the calculated design loads according to IEC 61400-1 standard were proved to valid.

• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2001년도 하계 학술대회 논문집(KISPS SUMMER CONFERENCE 2001
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• pp.265-268
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• 2001

내용에 기반한 동영상 검색에서, 대표 프레임을 자주 이용하는데, 이를 위해 우선적으로 동영상의 장면변화를 검출하는 기술이 필요하다. 일반적으로 컬러 히스토그램 비교방법이 많이 쓰이나, 급격한 조명변화에 민감하고 컬러 히스토그램 분포가 비슷한 부분의 장면전환을 놓칠 수 있다는 단점이 있다. 본 논문에서는 컬러 히스토그램 비교방법과 엔트로피를 복합적으로 이용하여 조명변화에 의해 장면전환이 잘못 검출되는 것을 막을 수 있다. 실험을 통해 제안한 방법은 컬러 히스토그램 비교방법보다 조명변화에 보다 감격함을 확인할 수 있었다.

• 대한전자공학회논문지
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• 제27권9호
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• pp.1351-1363
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• 1990

In this paper, a reliable control system structured with dual CPU modules and dual I/O modules is implemented as a means of achieving a highly reliable fault tolerant control system. For this, faults in the system modules are first examined, and a fault detection technique consisting of self diagnostic, comparison process, and exception processing is applied. Self diagnostic is used to locate which components in the modules have been failed, while comparison process is to cmpare control outputs computed by both CPU modules and protect the plant from malfunction by blocking failed control outputsin advance. Finally exception processing is used to determine the faults that are not detected immediately by the self diagnostic and comparison process, e.g. bus error processing when acknowledge signal for data transfer is not activeted in the I/O modules. Also reliability analysis is conducted for the discrete time Markov model with dual structure. It is shown quantitatively that the reliability is improved in the control system with dual structure in comparison with a system with single module structure.

• 정보처리학회논문지A
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• 제10A권2호
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• pp.131-136
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• 2003

본 논문에서는 여러 가지 동시성제어 알고리즘들의 비교기준을 설정하는데 어떠한 항목들이 필요한지 알아보고 선택모델을 작성한다. 또한 작성된 선택모델을 이용하여 동시성제어 알고리즘들을 비교 분석한다. 분석 결과는 동시성제어 알고리즘이 필요한 시스템 개발시 사용자 환경에 맞는 최선의 알고리즘을 선택 할 수 있도록 하는데 크게 기여할 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.25-27
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• 2005

This paper deals with the comparison and analysis of brushless DC (BLDC) motor with radial and polar anisotropic plastic magnet. The open-circuit field distributions and back-emf for BLDC motor with polar plastic magnet are established analytically and the results are validated extensively by comparison with finite element (FE) analyses. On the basis of two dimensional (2-D) analytical solutions, this paper predicts open-circuit field characteristics according to design parameters and makes a comparison between BLDC motor with polar plastic magnet and it with radial plastic magnet in terms of required magnet volume and harmonic of air-gap flux density waveform.

• 한국통신학회논문지
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• 제10권6호
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• pp.296-307
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• 1985

다중모드와 단일모드 광섬유의 특성을 순회측정한 결가이다. 7개의 다중모드 광섬유와 4개의 단일모드 광섬유를 사용하여 5개의 국내 기관이 참여하고 비교, 연구하였다. 그 결과를 외국의 순회측정과 비교하여 보았다.

• International Journal of Advanced Culture Technology
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• 제8권2호
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• pp.289-296
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• 2020

Software copyright are written in text form of documents and stored as files, so it is easy to expose on an illegal copyright. The IOT framework configuration and service environment are also evaluated in software structure and revealed to replication environments. Illegal copyright can be easily created by intelligently modifying the program code in the framework system. This paper deals with similarity comparison to determine the suspicion of illegal copying. In general, original source code should be provided for similarity comparison on both. However, recently, the suspected developer have refused to provide the source code, and comparative evaluation are performed only with executable code. This study dealt with how to analyze the similarity with the execution code and the circuit configuration and interface state of the system without the original source code. In this paper, we propose a method of analyzing the data of the object without source code and verifying the similarity comparison result through evaluation examples.

• 한국신뢰성학회지:신뢰성응용연구
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• 제12권1호
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• pp.25-33
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• 2012

As to display products are made slim, the diameter of aluminum electrolytic capacitor is smaller and the length is longer to be fitted in. These small diameter and long length are pointed as the disadvantageous design factors of the capacitor's life cycle. So, the most electronic makers want to use proven capacitors (or well-known) to secure reliability of the electric products. In this study, we carried out the comparison analysis with two domestic capacitors and one foreign made capacitor. We designated separators, rubber breather and debris as the main factors that effect on the lifetime of capacitors. From the comparison results, we suggested the improvement points of the aluminum electrolytic capacitor.