• 한국컴퓨터정보학회논문지
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• 제14권7호
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• pp.25-32
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• 2009

논문에서는 오프라인 환경에서 패턴분석을 적용하여 두필적의 유사성을 자동으로 분석하여 필적을 검증하는 방법을 제안한다. 제안된 방법에서는 먼저 필적 문서에서 문자 영역만을 분할하고, 분할된 문자 영역에 대한 특징을 추출한다. 그리고 비선형적인 형태로 추출되는 특징으로부터 동적 타임 워핑(DTW)과 다변량 통계 분석법(PCA) 알고리즘을 이용하여 기준이 되는 특징과의 유사성을 구한다. 본 논문에서 제안된 필적 검증 방법은 효과적인 특징 추출 방법 및 기존의 짧은 패턴에서 효과적으로 수행하던 방법들을 다양한 길이를 가진 특징에 대해서도 효과적으로 필적 검증이 가능하도록 하였다. 본 논문은 실험 결과는 제안된 방법인 기존의 방법보다 우수함을 다양한 실험을 통해서 보여준다. 제안된 필적 검증 방법은 기존에 감정 전문가에 의해 수동적으로 수행되던 필적 검증 작업을 자동화하고, 기존 필적 검증 작업의 객관성을 배가할 수 있을 것으로 기대된다.

• 한국컴퓨터정보학회논문지
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• 제15권7호
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• pp.19-26
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• 2010

본 논문에서는 온라인 환경에서 필기 문자열을 입력받고, 입력된 문자열의 유사성을 자동으로 분석하여 두 필적이 동일인에 의해 작성된 것인지를 판단하는 새로운 필적 감정 방법을 제안한다. 제안된 방법에서는 먼저 온라인으로 입력된 문자열에 회전 프로젝션(circular projection) 방법을 적용하여 모양, 방향 등과 같이 문자열이 가진 고유의 특징을 추출하여 벡터의 형태로 저장한다. 그런 다음, 문자 인식 분야에서 많이 사용되는 기존의 동적 타임 워핑 알고리즘을 개선하여, 이를 입력된 두 문자열의 특징 벡터의 유사성을 추출하는데 적용한다. 본 논문에서 개선된 동적 타임 워핑 알고리즘은 최적화 문제에서 좋은 결과를 산출한다고 알려진 분기한정법(branch and bound)의 개념을 기존의 동적 타임 워핑 알고리즘에 효과적으로 결합함으로써 기존의 동적 타임 워핑 알고리즘의 효율을 향상시켰다. 제안된 필기 문자열 감정 알고리즘의 성능을 확인하기 위한 실험에서는 다양하게 입력된 필기 문자열을 가지고 제안된 방법의 성능을 비교 하였으며, 그 결과 제안된 방법이 기존의 알고리즘에 비해 보다 효율적으로 필적을 감정하였음을 검증하였다.

• 한국생산제조학회지
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• 제22권4호
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• pp.730-734
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• 2013

The dynamic simulation of machine tools and motion control systems has been widely used for optimization, design verification, control design, etc. There are three main streams in dynamic simulation: structural dynamic analysis based onthe finite element method, dynamic motion analysis based on equations of motion, and control system analysis based on transfer functions. Generally, one of these dynamic simulation methods is chosen and employed for specific purposes. In this study, an integrated dynamic simulation is introduced, in which the structure, motion, and control dynamics are combined together. Commercially well-known software is used in the integrated dynamic simulation: ANSYS, ADAMS, and Matlab/Simulink. Using the integrated dynamic simulation, the dynamics of a magnetic bearing stage is analyzed and the causes of oscillation and noise are identified. A controller design for suppressing a flexible dynamic mode is carried out and verified through the integrated dynamic simulation.

• 한국시뮬레이션학회논문지
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• 제27권1호
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• pp.25-32
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• 2018

본 논문은 모델 기반 내장형 소프트웨어의 자동 생성 코드에 대한 효율적인 신뢰성 시험 절차와 구체화된 동적 시험 방안에 대해서 제시하고 있다. 모델 정적/동적 시험 각각을 코드 정적/동적 시험 전에 수행함으로서 코드 신뢰성 시험 수행의 이점이 있음을 기술하였다. 또한, 모델과 코드의 신뢰성 시험 상관관계를 모델의 경우 Model Advisor와 Verification and Validation tool, 코드의 경우 Polyspace와 LDRA를 이용하여 살펴보고 제시한 절차대로 수행한 신뢰성 시험의 결과를 보여주고 있다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.380-386
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• 2008

The development of a new railway vehicle is under progress through the Next Generation High-Speed Rail Development Project in Korea. Its aim is to develope fundamental technology of the vehicle that can run over 400km/h. The new distributed traction bogie system, 'HEMU'(High-speed Electric Multiple Unit), will be used and is different from that of previously developed high speed railway vehicles. Previous vehicles adopted push-pull type system, which means one traction-car drives rest all of the vehicle. Due to the difference, investigation on dynamic behavior and its safety evaluation are necessary, as a part of verification of the design specification. In the paper, current progresses of researches are presented. And the High-Speed Railway vehicle system is evaluated for a dynamic characteristic simulation. Proper dynamic models including air-suspension system, wheel-rail, bogie and car-body is developed according to the vehicle simulation scenario. The basic platform for the development of dynamic solver is prepared using nodal, modal coordinate system and wheel-rail contact module. Operating scenario is prepared using commercial dynamic analysis program and used for development of dynamic model, which contains many parts such as carbodies, bogies and suspension systems. Furthermore, international safety standard is applied for final verification of the system. Finally, the reliability of the dynamic model will be verified with test results in the further researches. This research will propose a better solution when test results shows a problem in the parts and elements. Finally, the vehicle that has excellent performance will be developed, promoting academic achievement and technical development.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1631-1635
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• 2011

To consider dynamic magnification effect at the static design stage, impact load factor is applied to design load. Current impact load factor adopted EUROCODE without verification while Japan suggested impact load factor including velocity of high-speed train throughout theoretical and experimental studies. On the purpose of evaluate current impact load factor, this study investigated the calculation of impact load factor from dynamic response of running train.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1636-1640
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• 2011

To consider dynamic magnification effect at the static design stage, impact factor is applied to design load. Current impact factor adopted EUROCODE without domestic verification through theoretical and experimental studies. This study evaluated impact factor of railway bridges from dynamic response under KTX running. Moving Average Method was applied to calculate impact factor. Investigation considering different type of bridges and tracks including velocity was conducted.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1996년도 추계학술발표회논문집(1)
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• pp.91-96
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• 1996

The Dynamic Safety System (DSS) is a compute. based reactor protection system that has fail-safe nature and perform dynamic self-testing. In this paper, the implementation of DSS in PLC is presented for PWR. In order to choose adequate PLC implementation model of DSS, the reliability analysis is performed. The KO-RI unit 2 Nuclear power plant is selected as the reference plant, and the verification is carried out using the KO-RI unit 2 simulator FISA-2.

• Structural Engineering and Mechanics
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• 제21권3호
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• pp.369-374
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• 2005

A big progress has been made for moving force identification from bridge dynamic responses in recent years. Current knowledge and the potentials on moving force identification methods are reviewed in this paper under main headings below: background of moving force identification, experimental verification in laboratory and its application in field.

• 한국산업융합학회 논문집
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• 제26권6_3호
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• pp.1233-1241
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• 2023

This paper investigates the efficient application of drone LiDAR technology for acquiring precise point cloud data in construction and civil engineering. A structured workflow encompassing data acquisition, processing, and accuracy verification is introduced. Practical testing on a construction site affirms that drone LiDAR surveying yields accurate and reliable data across various applications. With a focus on accuracy and verification, the results contribute to the progression of surveying methodologies in construction and civil engineering. The findings provide valuable insights into the dynamic technological landscape of these fields, establishing a foundation for more effective and precise surveying techniques. This study underscores the transformative potential of drone LiDAR technology in shaping the future of construction and civil engineering survey practices.