• 대한원격탐사학회지
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• 제21권2호
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• pp.135-143
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• 2005

최근 고해상도 영상의 공급에 있어 물리적 센서 모델의 대안으로서 RPC(Rational Polynomial Camera) 모델이 활발히 이용되고 있다. RPC 모델을 통하여 지상 좌표와 영상 좌표간의 ,기하 관계를 단순하고도 정확하게 묘사할 수 있어 과거 물리적 센서 모델을 통하여만 이루어질 수 있었던 정사보정, 스테레오 영상을 이용한 3차원 좌표 추출 등의 처리가 가능하게 되었다 본 연구에서는 RPCs(Rational Polynomial Coefficients)가 주어진 스테레오 영상으로부터 3차원 좌표를 추출할 수 있는 매우 간단한 방법을 제안하고자 하였다. 제안된 방법은 Downhill Simplex 기법을 이용하는 방법으로서, Downhill Simplex 기법은 함수의 최소값을 찾는데 있어 편미분 계산을 수행하지 않는다는 장점을 가지고 있다. 본 연구에서 제안된 Downhill Simplex 기법을 이용한 RPC 스테레오 영상으로부터의 3차원 좌표 추출 기법은 실제 사용이 가능한 소프트웨어 프로그램으로서 구현되었으며, 서울 지역의 스테레오 IKONOS 영상에 시험 적용되었다. 시험 적용 결과, 본 방법은 비교적 빠르게 3차원 좌표를 계산할 수 있는 것으로 평가되며, RPCs가 주어진 스테레오 영상으로부터 3차원 좌표를 추출할 수 있는 실제적 기술로서 사용이 가능할 것으로 기대된다.

• 한국건설관리학회논문집
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• 제16권4호
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• pp.98-106
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• 2015

VE는 공공건설사업의 예산절감과 기능향상, 구조적 안전, 품질 확보를 목적으로 하고 있다. 그러나 관련 내용이 설계의 경제성 검토 위주로 구성되어 있어 구조적 안전과 품질확보를 위한 검토가 미흡해 질 가능성이 문제점으로 지적되고 있고, VE를 단순한 원가절감방법으로 생각하는 인식으로 인해 VE 수행 시 비용절감에 치중된 대안이 제시되어 왔다. 이에 대한 개선방안으로 정부에서는 생애주기비용절감 가치향상 제안서를 도입하고 원안과 대안의 비용 점수와 기능 점수, 가치 변화를 명시하도록 하였다. 그러나 구체적인 방법과 기준이 제시되어 있지 않아 이론적 근거보다는 실무적 편의 위주의 방법이 사용되고 있다. 현행 방법은 원안과 대안의 비(比)를 이용하기 때문에 간단하고 사용이 편리하다. 하지만 현행 방법을 이용하여 평가 값을 점수화 하면 설계안 속성에 따라 다양한 값이 산출되어 광범위한 점수 분포를 나타낸다. 따라서 많은 양의 VE 안을 평가하여 수정 설계를 위한 최적 안을 선택하는 의사결정과정에서 평가자에게 혼란을 줄 수 있다. 이는 합리적인 의사결정을 저해하는 요소로서, VE대안의 비용과 성능 속성 정보를 이용하여 산출한 가치 점수의 신뢰성 및 객관성 검증의 어려움으로 이어진다. 본 연구는 VE 안 평가 시 의사결정의 효율성 제고를 위하여 기능 점수와 비용 점수 산출 절차와 방법을 고찰하여 문제점을 제시하고, 개선 방안으로서, 정규화 기반의 기능 및 비용 점수 산출 모델을 제시하였다.

• Asia Marketing Journal
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• 제18권3호
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• pp.47-63
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• 2016

Rational choice theory holds that the alternative with largest expected utility in the choice set should always be chosen. However, it is often observed that an alternative with the largest expected utility is not always chosen while the choice task itself being avoided. Such a choice phenomenon cannot be explained by the traditional expected utility maximization principle. The current study posits shows that such a phenomenon can be attributed to the gap between the expected perceived gain (or loss) and the expected perceived value. This study mathematically analyses the relationship between the expectation of an alternative's gains or losses over the reference point and its expected value, when the perceived gains or losses follow continuous probability distributions. The proposed expected value (EV) function can explain the effects of loss aversion and uncertainty on the evaluation of an alternative based on the prospect theory value function. The proposed function reveals why the expected gain of an alternative should exceed some positive threshold in order for the alternative to be chosen. The model also explains why none of the two equally or similarly attractive options is chosen when they are presented together, but either of them is chosen when presented alone. The EV function and EG-EV curve can extract and visualize the core tenets of the prospect theory more clearly than the value function itself.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2003년도 추계학술발표회 논문집
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• pp.423-431
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• 2003

This study presents on generation coefficients of the RFM using GEO-level stereo images of the IKONOS satellite. 3-D positioning and DEM generation of this model on the test field. In result, the maximum error of image coordinates acquired by the upward transform of the RFM did nat exceed 8 pixels. DEM was generated with kriging interpolation extracted three dimensional ground coordinate to rational quadratic function form, me compared it to reference digital elevation model made from 1:5,000 digital map and 1:1,000 digital map, and so, could generate digital elevation model in the accuracy as average RMSE of elevation was ${\pm}$ 3∼5 m in RFM.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.492-495
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• 1997

Integral type system is that a system is represented by a proper rational function. In this paper, novel control scheme based on model reference approach is proposed for integral type system. The proposed scheme compensates various undesirable effects of the system. In especially, the proposed scheme applied to DC servo control system, analyzed its control characteristic. Performances of the proposed system show excellent control characteristics; complete compensation of the undesirable nonlinear friction and load viscous, For proving realistic validities, LOS(Line Of Sight) stabilization system which has typically many nonlinear effects is experimented. After executing the computer simulation in "MATLAB", then the results are compared with the experiments. The results are very similar in theoretical study and the proposed control scheme is successfully verified. verified.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.82-87
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• 2002

RFM is the sensor model of IKONOS imagery for end-users. IKONOS imagery vendors provide RPC (Rational Polynomial Coefficients), Ration Function Model coefficients for IKONOS, for end-users with imagery. So it is possible that end-users obtain geospatial information in their IKONOS imagery without additional any effort. But there are requirements still fur rigorous 3D positions on RPC user. Provided RPC can not satisfy user and company to generate precision 3D terrain model. In IKONOS imagery, physical sensor modeling is difficult because IKONOS vendors do not provide satellite ephemeris data and abstract sensor modeling requires many GCP well distributed in the whole image as well as other satellite imagery. Therefore RPC modification is better choice. If a few GCP are available, RPC can be modified by method which is introduced in this paper. Study on evaluation modified RPC in IKONOS reports reasonable result. Pseudo GCP generated with vendor's RPC and additional GCP make it possible through sequential solution.

• 교육시설
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• 제8권2호
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• pp.5-12
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• 2001

As the exiting school facilities become old and unfit for new curriculum, the systematical remodelling process based on its educational and physical functions is required. due to the inadequate maintenance and repairing practices, unnecessary costs are expended. Therefore, this study aims to establish a remodelling decision-making model for improving the educational environment of the existing school facilities. According to the budget system, it proposes the concept of remodelling that includes the activities of extension, reconstruction, repair and improvement. This study classifies the performance evaluation for school facilities as that of safety, durability and educational function, and articulates the assessment standards, methods and elements. In the end, it suggests a rational model for remodelling decision-making that can provide efficient and comprehensive remodelling process, economic and sustainable school development.

• 대한전기학회논문지
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• 제33권10호
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• pp.387-395
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• 1984

This paper proposes an improved unit commitment algorithm for the purpose of rational operation of electric power systems. Security function is introduced to consider generation system reliability as well as economical properties in the algotithm . As a stte model for assessment of state probabilities, the 3-state model in which the probability of the units for commitment can be considered is proposed and applied, so that the algorithm becomes more practical and reasonable one. A decision bounding scheme which can be applied to all kinds of system is described and the numerical results obtained for KEPCO and model systems are also presented to assure the availability of the proposed technique.

• 드라이브 ㆍ 컨트롤
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• 제15권4호
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• pp.67-73
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• 2018

The paper deals with an approach to time domain simulation for closed end at the downstream of pipe, hydraulic lines terminating into a tank and series lines with change of cross sectional area. Time domain simulation of a fluid power systems containing hydraulic lines is very complex and difficult if the transfer functions consist of hyperbolic Bessel functions which is the case for the distributed parameter dissipative model. In this paper, the magnitudes and phases of the complex transfer functions of hydraulic lines are calculated, and the MATLAB Toolbox is used to formulate a rational polynomial approximation for these transfer functions in the frequency domain. The approximated transfer functions are accurate over a designated frequency range, and used to analyze the time domain response. This approach is usefully to simulate fluid power systems with hydraulic lines without to approximate the frequency dependent viscous friction.

• 품질경영학회지
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• 제46권4호
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• pp.821-842
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• 2018

Purpose: To derive key requirements and key technologies for weapon system acquisition business by using Qualify Function Deployment (QFD), and to reduce business cost by setting the target performance and key expense of weapon system. Methods: We propose a QFD methodology that can induce rational decision-making by translating analyst's subjective opinions into quantitative values when analyzing requirements at the initial stage of weapon system development project. Based on QFD methodology, QFD application model combining house of quality, value engineering, and analogy cost estimating technique is presented. Results: It was possible to analyze the specific requirements necessary for the development of the weapon system, to solve the communication problem of the participants, to set clear development direction and target. Conclusion: By applying the QFD application model at the early stage of the weapon system acquisition project, it is possible to reduce the business cost by establishing clear development direction and goal through the procedural analysis process.