• 대한전기학회논문지:시스템및제어부문D
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• 제53권4호
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• pp.277-285
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• 2004

We present a new hybrid stereo matching technique in terms of the co-operation of area-based stereo and feature-based stereo. The core of our technique is that feature matching is carried out by the reference of the disparity evaluated by area-based stereo. Since the reference of the disparity can significantly reduce the number of feature matching combinations, feature matching error can be drastically minimized. One requirement of the disparity to be referenced is that it should be reliable to be used in feature matching. To measure the reliability of the disparity, in this paper, we employ the self-consistency of the disunity Our suggested technique is applied to the detection of 3D line segments by 2D line matching using our hybrid stereo matching, which can be efficiently utilized in the generation of the rooftop model from urban imagery. We carry out the experiments on our hybrid stereo matching scheme. We generate synthetic images by photo-realistic simulation on Avenches data set of Ascona aerial images. Experimental results indicate that the extracted 3D line segments have an average error of 0.5m and verify our proposed scheme. In order to apply our method to the generation of 3D model in urban imagery, we carry out Preliminary experiments for rooftop generation. Since occlusions are occurred around the outlines of buildings, we experimentally suggested multi-image hybrid stereo system, based on the fusion of 3D line segments. In terms of the simple domain-specific 3D grouping scheme, we notice that an accurate 3D rooftop model can be generated. In this context, we expect that an extended 3D grouping scheme using our hybrid technique can be efficiently applied to the construction of 3D models with more general types of building rooftops.

• 대한전기학회논문지
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• 제39권2호
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• pp.199-209
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• 1990

In this paper, a multivariable robust controller for a boiler-burbine system is designed by using a modified LQG/LTR method. From the known nonlinear dynamic model, a linearized model is obtained with the saturations at both input magnitude and input varying rate. The modeling error is analyzed at various operation points. A new dynamics augmentation method in the LQG/LTR method is suggested which can be applied to LQG/LTR method to reject the input and output disturbances and to follow reference inputs under modeling errors. The good performance of the designed controller is shown by simulations in various conditions.

• Nuclear Engineering and Technology
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• 제52권11호
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• pp.2415-2421
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• 2020

The axial heterogeneous void distribution in a fuel channel is a relevant and important issue during nuclear reactor analysis for LWR, especially for boiling water channel-type reactors. Variation of the coolant density in fuel channel has an effect on the neutron spectrum that will in turn have an impact on the values of absolute reactivity, the void reactivity coefficient, and the fuel isotopic compositions during irradiation. This effect is referring to as the history effect in light water reactor calculations. As the void reactivity effect is positive in RBMK type reactors, the underestimation of water density heterogeneity in 3D reactor core numerical calculations could cause an uncertainty during assessment of safe operation of nuclear reactor. Thus, this issue is analysed with different cross-section libraries which were generated with WIMS8 code at different reference water densities. The libraries were applied in single fuel model of the nodal code of QUABOX-CUBBOX/HYCA. The thermohydraulic part of HYCA allowed to simulate axial water distribution along fuel assembly model and to estimate water density history effect for RBMK type fuel.

• 통상정보연구
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• 제8권1호
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• pp.417-435
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• 2006

A Systematic Wealth Management Framework (SWMF) was developed as a private banking management tool to enable more integrative personal finance management of personal wealth. It is a reference model that provides an unified framework for development, operation, and management and makes provision for personal financial services in today's complex financial environment. This study suggested some practical results from banks and insurance companies that have established SWMF as the differentiation business strategy for wealthy customers. The focus of this manuscript is on capturing the methodological approach most financial institutions in Korea adopted to execute new e-finance planning and implementation based on the SWMF. The alignment between the wealth management business goals and information system architecture at an organization constitutes the main theoretical basis of the study. Relevant discussions are made on the wealth management framework as a general business model for financial industry, on the functional relationship between new information systems and business organizations. Finally, lessons learned from the SWMF implementation are discussed.

• 문화기술의 융합
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• 제7권4호
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• pp.823-831
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• 2021

인터넷 시대에 접어들면서 디지털 문화 산업이 크게 발전하고 있으며, 창업 회사가 인터넷 시장이라는 레드 오션에서 자리를 잡기 위한 혁신적인 비즈니스 모델은 많은 기업들이 직면한 중요한 도전과 기회이다. 본 연구는 가상 아이돌 하츠네 미쿠를 출발점으로 하여 기술 혁신, 가치 주장, 자원 조합, 경영 프로세스와 마케팅 모델 등을 분석한다. 구체적으로 크립톤(Crypton) 회사의 1세대 소프트웨어 Meiko와 2세대 소프트웨어 하츠네 미쿠의 차이에 대한 비교를 통해 비즈니스 모델의 구성 요소를 연구하고, 이를 통해 해당 비즈니스 모델의 특징과 장점을 탐구하며, 경영 모델과 창의적 부분에 대한 심층 분석으로 기타 전자 상품과 소프트웨어 개발 회사의 비즈니스 모델 구축에 실질적인 참고를 제공하고자 한다.

• 한국문헌정보학회지
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• 제47권3호
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• pp.207-226
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• 2013

공공도서관에서 전자정보 서비스를 시작된 지 10여년이 지났지만 효율적인 서비스 운영을 위한 전문성 부족과 저작권 문제의 제약으로 활용 면에서 두드러진 성과를 얻지 못하고 있는 실정이다. 본 연구에서는 국내외 협력형 전자정보 서비스 운영 사례와 경기도 및 경기도 내 31개 시군의 도서관 전자정보 서비스 현황 분석을 통해 광역자치단체 차원의 지역 내 공공도서관 간 상호 협력형 서비스 모델을 개발하고자 하였다. 이를 위해 협력형 전자정보 서비스를 운영하고 있는 국내외 기관의 웹서비스 현황을 파악하고, 설문 조사를 통해 경기도 내 시군 기관별 전자정보 서비스 현황을 조사하여 분석하였다. 연구결과, 성공적인 협력형 정보서비스 모델 구현을 위한 기능요건으로 소장 전자정보 통합검색, 웹DB, 지역 기록물 원문DB, 온라인 참고봉사, 모바일 플랫폼 지원을 제시하고 시스템 관리 체계는 참여기관의 독립적 특성을 고려하여 집중형과 분산형 모델의 장점을 결합한 절충형 모델을 제안하였다.

• 대한조선학회논문집
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• 제59권5호
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• pp.288-295
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• 2022

In this study, the force and moment acting on a Joubert BB2 submarine model at depths near the free surface were measured through a captive model test with the scale ratio of 1/15. Based on the experiment, the pitch moment and heave force due to the "Tail suction effect", including the change in surge force with depth near the free surface, were quantitatively analyzed. The change of force and moment according to the relative position of the sail and the free surface was reviewed with the free surface waves generated for each depths. As a result, the angle of attack of the hull to counteract the pitch moment induced by the tail suction effect was derived. The effect of the hydrostatic moment component according to the angle of attack on the equilibrium of pitch moment was also taken into account. The control plane performance tests for the X-type rudder and sail plane were conducted in snorkel and surface depth conditions to figure out the control plane angles for the neutral level flight of the submarine at near free surface. The results of this study are expected to be used as a reference data for the neutral level flight of the submarine at near free surface operation in the free running model test as well as numerical studies.

• 전자공학회논문지
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• 제50권1호
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• pp.86-96
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• 2013

통합 음성/오디오 부호화기 (Unified Speech and Audio Coding, USAC)는 2011년 MPEG에서 FDIS (Final Draft International Standard)를 승인받은 최고 성능의 통합 음성/오디오 부호화기이다. 전통적으로 MPEG에서는 복호화기 기술만 표준화하므로 인코더 기술에 대한 고찰이 쉽지 않을 뿐 아니라, 예제로 공개하는 인코더 (Reference Model, RM)의 경우에도 기본 아이디어만을 포함하고 있기 때문에 이를 사용할 경우 성능 저하가 매우 심각하다. 성능 열화는 매우 심각하다. 이러한 문제를 최소화하기 위해 오픈 소스 기반으로 진행되고 있는 프로젝트 JAME에서는 USAC에 적용된 핵심 인코더 기술의 성능을 최대화 할 수 있는 방법을 제안하고 있다. 본 논문에서는 입력 신호에 따라 두 코더가 선택적으로 동작되게 하는 신호 분류기와 심리 음향 모델을 기반으로 하는 주파수 부호화 기술, 그리고 전이 윈도우 기술 등의 주요 인코더 기술들에 대하여 소개한다. 또한 FDIS를 위한 verification test 결과와 Common Encoder의 성능 평가를 덧붙인다.

• 대한기계학회논문집A
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• 제21권7호
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• pp.1030-1041
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• 1997

The control model in the tandem cold rolling mill consists of many mathematical theories and is used to calculate the reference values such as the roll gap and the rolling speed for good operation of rolling mill. But, the control model used presently has a problem causing inaccurate prediction of the rolling force. By the parameter identification, it was found that the main factor causing inaccurate prediction of the rolling force was incorrect modeling of the friction coefficient and the flow stress. To get rid of the erroneous factor new adaptive schemes are suggested in this work. Those are a long-time adaptation by the iterative least-square method and a short-time adaptation by the recursive weighted least-square method respectively. The new equations for the friction coefficient and the flow stress are derived by applying the suggested adaptive algorithms. Through the on-line test in an actual mill, it is proved that the rolling force predicted by the new equations is more accurate than the one by the existing equations ever used.

• 시스템엔지니어링학술지
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• 제11권1호
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• pp.1-7
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• 2015

The purpose of this paper is to present the results of reengineering of the YGN 3&4 (Yonggwang Nuclear Power Plant, Units 3&4) SDS (Safety Depressurization System) retrofit design and to make recommendations for the improvement in design and design procedure implementing the Systems Engineering (SE) process. YGN 3&4 is a basic model for OPR1000 (the Korean standard 1000 MWe plant). The basic model, herein, represents the reference plant for the OPR1000 development. In the middle of the YGN 3&4 construction, the Korean Nuclear Regulatory Body requested a retrofit of this plant with a means to rapidly depressurize the plant in conformance with a severe accident mitigation requirement. For the reengineering of the SDS in YGN 3&4, V-model and functional and physical architectures have been developed. A SE decision making method has been used for the selection of SDS valves. Finally, recommendations have been made to improve OPR1000 design for the improved operation and enhanced safety.