• 대한교통학회지
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• 제23권5호
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• pp.113-120
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• 2005

도로 선형 설계의 제1의 목표는 통행의 안전과 원활한 운행 여건을 구조적으로 확보하는 데에 있다. 현재 우리나라 도로 설계법은 외국의 설계기준과 방법론을 바탕으로 한 것이나, 도로를 이용하는 사람이나 차량의 특성이 설계체계에 반영되어 있지 않아, 설계자의 기대와 이용자의 이용 행태간의 간격이 존재하며, 그 결과는 안전하고 편리한 도로를 제공하는 데에 장애가 된다. 도로 기하구조 설계의 적정성을 높이고 안전성을 높이기 위해서는 차량 주행 특성에 기반한 도로 선형 설계기준과 그 적용 체계를 갖출 필요가 있다. 본 연구에서는 실제 도로 이용자의 특성이 반영된 도로 설계 체계를 갖추는 작업의 일환으로 일반국도 4차로도로의 단일 곡선부 구간에 대한 주행 차량의 속도 분포 특성을 바탕으로 일반국도의 선형의 설계기준을 적용하는 방안을 제시하였다.

• 한국정밀공학회지
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• 제20권6호
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• pp.96-104
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• 2003

This paper presents the measurement and correction method of PCB alignment errors for PCB screen printer. Electronic equipment is getting smaller and yet must satisfy high performance standard. Therefore, there is a great demand for PCB with high density. However conventional PCB screen printer doesn't have enough accuracy to accommodate the demand for high-resolution circuit pattern and high-density mounting capacity of electronic chips. It is because the alignment errors of PCB occur when it is loaded to the screen printer. Therefore, this study focuses on the development of the system which is able to measure and correct alignment errors with high-accuracy. An automatic optical inspection part measures the PCB alignment errors using machine vision, and the high-accuracy 3-axis stage makes correction for these errors. This system used two CCD cameras to get images of two fiducial marks of PCB. The centers of fiducial marks are obtained by using moment, gradient method. The first method is calculating the centroid by using first moment of blob, and the latter method is calculating the center of the circle whose equation is obtained by curve-fitting the boundaries of fiducial mark. The operating system used to implement the whole set-up is carried in Window 98 (or NT) environment. Finally we implemented this system to PCB screen printer.

• 한국지진공학회논문집
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• 제8권1호
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• pp.1-15
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• 2004

고층의 강 모멘트저항골조에 대한 지진 응답을 살펴보기 위해서 동적해석을 실시하였다. 구조물은 세가지의 다른 설계절차로 의도적으로 설계하였고 그 세가지의 개념은 강도 지배설계, 강기둥-약보 지배설계, 횡변위 지배설계이다. 그렇게 설계한 구조물이 각각 질량비정형이 존재하도록 하여 횡변위, 소성한지, 이력에너지 입력 및 요구응력에 대해서 토론하였다. 미래에 설계에의 응용을 위해서 최대 지반가속도로 표현한 두 등급의 지진 하중을 이용해서 이력에너지 입력요구 곡선을 제시하였다.

• 산업공학
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• 제16권1호
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• pp.103-110
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• 2003

Growth curves are widely used in forecasting the market demand. When there are only a few data points available, the estimated model parameters have a low confidence. In this case, if some expert opinions are available, it would be better for predicting future demand to adjust the model parameters using these information. This paper proposes the methodology for re-estimation of model parameters in growth curves when adjusting market potential and/or time of maximum sales. We also provide the detailed procedures for five growth curves including Bass, Logistic, Gompertz, Weibull and Cumulative Lognormal models. Applications to real data are also included.

• Earthquakes and Structures
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• 제3권3_4호
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• pp.413-434
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• 2012

This paper presents a displacement-based seismic design method with damage control, in which the targets for the considered performance level are set as displacements and a damage distribution is proposed by the designer. The method is based on concepts of basic structural dynamics and of a reference single degree of freedom system associated to the fundamental mode with a bilinear behaviour. Based on the characteristics of this behaviour curve and on the requirements of modal spectral analysis, the stiffness and strength of the structural elements of the structure satisfying the target design displacement are calculated. The formulation of this method is presented together with the formulations of two other existing methods currently considered of practical interest. To illustrate the application of the proposed method, 5 reinforced concrete plane frames: 8, 17 and 25 storey regular, and 8 and 12 storey irregular in elevation. All frames are designed for a seismic demand defined by single earthquake record in order to compare the performances and damage distributions used as design targets with the corresponding results of the nonlinear step by step analyses of the designed structures subjected to the same seismic demand. The performances and damage distributions calculated with these analyses show a good agreement with those postulated as targets.

• International Journal of Computer Science & Network Security
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• 제22권11호
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• pp.373-380
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• 2022

The field of land surveying is changing dramatically due to the way data is processed, analyzed and presented. Also, there is a growing demand for digital spatial information, coming primarily from the GIS (Geographical Information System) user community. Such a demand has created a strong development potential for a new land surveying software. An overview of the development and capabilities of a land surveying software platform based on the Windows system, SurveyingMap, is presented. Among its many features, SurveyingMap provides a lot of adaptability for networks adjustment, geodetic and plane coordinates transformation, contouring, sectioning, DTM (Digital Terrain Model) generation, and large scale mapping applications. The system output is compatible with well known computer aided drafting (CAD) /GIS packages to expand its scope of applications. SurveyingMap is also suitable for non-technical users due to the user-friendly graphic user interface. The system could be used in engineering, architecture, GIS, and academic teaching and research, among other fields. Two applications of SurveyingMap, extension of field control and large scale mapping, for the case study area are established. The results demonstrate that the system is adaptable and reasonably priced for use by college and university students.

• 벤처창업연구
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• 제10권3호
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• pp.123-131
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• 2015

빠르게 발전하는 IoT 시대에 발맞추어, IoT 적용과 관련하여 다양한 시나리오에 이용할 수 있는 경영 전략을 이끌어내기 위한 체계적인 접근이 요구된다. 본 논문에서는, IOT를 적용할 때 시장 잠재력을 평가하고 초기 경영 전략을 세울 때 사용할 수 있는 개념적 틀을 제시한다. 개념적 틀은 널리 알려진 가치곡선분석, 생태계 분석 그리고 품질의 집을 이용하여 구성하였다. 가치곡선 분석은 소비자에게 가치를 주는 항목을 파악하는 부분과 이와 관계된 공급자의 강점을 분석하는데 이용된다. 생태계 분석은 공급사슬 상의 참가자들과 그들의 관계를 파악하는데 이용된다. 품질의 집은 공급자에게 소비자의 요구사항을 파악하고 그것을 공급자의 기술적인 요구 조건과 비교하여 초기 사업 전략을 구축하는데 적합한 분석도구이다. 본 논문에서는 우리가 제시한 개념적 틀을 IoT를 적용하였을 때 큰 발전 가능성이 있는 Car-sharing 서비스와 telehealth 서비스 이렇게 두 가지 서비스에 적용하여 분석하였다.

• 한국지반환경공학회 논문집
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• 제13권6호
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• pp.73-81
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• 2012

해상풍력시스템의 규모가 점차적으로 증가하고 있는 추세에 따라 상부구조물을 지지하는 기초구조물 안정성 확보의 중요성이 대두되고 있다. 이에 따라, 지반공학적 측면에서 기초구조물과 지반의 상호작용이 전체 시스템에 미치는 영향을 파악하기 위한 해석방안이 요구되고 있으며, p-y 곡선 모델의 적용이 대표적인 방법이다. 본 연구에서는 풍황이 우수하여 해상풍력발전 시스템 운영을 위한 대상지로써 적합하다고 알려져 있는 제주도 해저지반(현무암)의 공학적 특성을 현재까지 제안된 암반 p-y 곡선 모델에 적용하였다. 이를 통해 제주도 및 국내 암반 분포 지역에 대한 해상풍력시스템 기초구조물과 해저암반 간의 상호작용 해석 과정을 정리하고 향후 연구 방향을 제안하였다. 전반적으로 암반 p-y 곡선 산정결과는 지표면에 근접할수록 지반반력이 증가하는 경향을 나타냈으며, 말뚝에 작용하는 모멘트, 전단력 등을 분석한 결과 암반의 공학적 특성을 적절히 모사할 수 있음을 확인하였다.

• 대한전기학회논문지:전력기술부문A
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• 제49권11호
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• pp.549-557
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• 2000

This study proposes a new numerical analysis method for assessing the outage cost of the composite power system with considering transmission system at load points. The proposed method comes from combination of the expected energy not served curve(EENSC) with the marginal outage cost function obtained at load points. Uncertainty of the outages of the generation and transmission systems was also included in this study. This study can be categorized into three processing parts as like as follows. Firstly, EENSC at load points was developed newly from the composite power system effective load duration curve which has been proposed by the authors. Secondly, this study proposes a new technical method for determining the coefficients of the marginal outage cost functions at load points in the composite power system(Generation and Transmission systems). It is a main key point that the mathematical expression for the marginal outage cost function at a load point is formulated and evaluated using relations between the GNP (or GDP) and the electrical energy demand at the load pint. Finally, the outage cost was calculated in this paper by combining the proposed EENSC with the marginal outage cost function evaluated at each load point. It is another important feature that the average costs for future at load points can be forescasted using the proposed approach. The effectiveness of the proposed new approach is demonstrated by the case studies with the IEEE-RTS.

• 전기학회논문지
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• 제68권1호
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• pp.27-35
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• 2019

There is a growing interest in various microgrid solutions that supply electricity 24 hours a day to off-grid areas where are not connected with the main grid, and Korea has many positive effects by constructing overseas microgrids as a country operating the emission trading scheme. Since it is not clear how to obtain load curves that is one of the inputs of the HOMER used to design a microgrid optimization plan, or it is necessary to examine whether electricity is supplied to the peak load level of the areas where have not received the electricity benefits from the viewpoint of the demand management, a methodology should be developed to know the load composition ratio and the shape of the daily load curve. In this paper, the relative coefficient and average load information for each load group obtained from the survey are used besides peak load and total average load. A mathematical model is proposed to derive the load composition ratio in the form of a Quadratic Programming and the load forecasting is performed using simple linear regression with future indicators. The effectiveness of the proposed method is confirmed for the Philippine island region supported by Korea Energy Agency and the Asian Development Bank.