• 한국국방경영분석학회지
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• 제34권3호
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• pp.1-12
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• 2008

효율적인 공급사슬 망 설계는 공급사슬망 전체의 최적화를 추구하고 이를 통해 장기적이고 전략적인 의사결정을 뒷받침한다. 공급사슬망 설계 문제는 고려 대상이 광범위하고 시스템 조건과 상황에 따라 많은 확률적 요소들을 포함하고 있기 때문에 이를 수리 모델로 표현하더라도 현실을 명확히 반영하기는 어렵다. 본 연구에서는 수리 모델 및 시뮬레이션 기법을 이용한 군 공급사슬망 설계 방법을 제시하였다. 혼합정수계획법이 적용된 수리 모델을 이용하여 총비용을 최소화하는 공급사슬망을 구성하고, 수리 모델의 결과를 시뮬레이션 모델에 반영하여 실험 파라미터의 반복적인 조정을 통해 차량할당 및 경로문제를 해결하였다. 본 연구의 두 모델은 각각 CPLEX와 AutoMod로 실행하였으며, 실제 군 공급사슬망에서 군지사의 임무 제한에 따라 공급사슬망을 재구성하는 실험을 실시하였다. 이 실험을 통하여, 본 연구에서 제시한 방법이 군 공급사슬망 설계 문제해결에 용이하게 적용될 수 있다는 것을 보였다.

• 한국전자통신학회논문지
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• 제8권3호
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• pp.447-452
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• 2013

본 연구에서는 콘센트용 누설전류 감지 및 자동차단 모듈을 개발하였다. 제안된 누설전류 검출 모듈은 저항성 누설전류 검출 칩을 사용한 콘센트용 누설전류 검출 모듈과는 차별화된, 전력 프로세서인 MSP430 MCU(Micro Controller Unit)를 이용하여 합성 누설전류에서 저항성 누설전류를 프로그램으로 분리 검출한다. 제안된 방법으로 구현된 모듈은 저항성 누설전류 5mA 이상에서 조기 검출 및 자동차단 기능이 있을 뿐만 아니라, 저항성 누설전류 검출 기능이 프로그램으로 구현되어 있어 저항성 누설전류 5mA 이하 또는 이상으로도 쉽게 조정이 가능한 장점이 있다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2005년도 춘계 학술발표회 논문집
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• pp.663-671
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• 2005

Distributed operation of overall structural design process, by which product and process optimization are implemented, is presented in this paper. The database-interconnected multilevel hybrid method, in which the conventional design method and the optimal design approach are combined, is utilized there. The method selectively takes the accustomed procedure of the conventional method in the conceptional framework of the optimal design. Design conditions are divided into primary and secondary criteria This staged application of design conditions reduces the computational burden for large complex optimization problems. Two kinds of numeric and graphic processes, are simultaneously implemented on the basis of concurrent engineering concepts in the distributed environment of PC networks. Numerical computation on server and graphic works on independent client are communicated through message passing. Numerical design is based on the optimization methodology and the drawing process is carried out by AutoCAD using the AutoLISP programming language. The prototype design experimentation for some steel trusses shows the validity and usability of the method. This study has sufficient adaptability and expandability in methodology, in that it is based on general theory and industry standard systems.

• 환경영향평가
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• 제19권3호
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• pp.315-321
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• 2010

ArcView and water network models have been integrated to develop the water network modeling system based upon GIS. To develop this system, pre, main, and post processing systems are required. GIS programming technique was adopted by using the ArcView's script language Avenue. The input data of models have been prepared by using the AutoCAD Map3D through the conversion of modeling input data to GIS data for A city. The modeling has been implemented by using EPANET, WaterCAD, InfoWorks. To develop the post processing system, the modeling results of the water network models have been analyzed by using GIS. During the application process of the developed system to B city with 300,000 population, main problems were found in the constructed GIS DB of that city. Thus, pilot study area of B city has been constructed, and pre-, main, and post-processing techniques were invented based upon GIS. Finally, the problems related to waterworks GIS projects in Korea were discussed and solutions were suggested.

• Journal of Positioning, Navigation, and Timing
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• 제9권2호
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• pp.89-98
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• 2020

Prediction of clock behaviors is necessary to generate very high stable system time which is essential for a satellite navigation system. For the purpose, we applied the Auto-Regressive Integrated Moving Average (ARIMA) model to the prediction of two hydrogen masers' behaviors with respect to the rapid Coordinated Universal Time (UTCr). Using the packaged programming language R, we made an analysis and prediction of time series data of [UTCr - clocks]. The maximum variation width of the residuals which were obtained by the difference between the predicted and measured values, was 6.2 ns for 106 days. This variation width was just one-sixth of [UTCr-UTC (KRIS)] published by the BIPM for the same period. Since the two hydrogen masers were found to be strongly correlated, we applied the Vector Auto-Regressive Moving Average (VARMA) model for more accurate prediction. The result showed that the prediction accuarcy was improved by two times for one hydrogen maser.

• 인터넷정보학회논문지
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• 제8권2호
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• pp.67-76
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• 2007

SFPI 모듈은 $SFP-MSA^2$ 규격에 의해 A0 및 A2의 메모리 영역에 데이터들이 저장된다 본 논문에서는 공장 자동화를 위하여 프로그래밍 언어 중 AGILENT의 $VEE^3$를 이용하였으며, SFP모듈의 광학 특성 및 SFP-MSA 규정에 따라 Digital Diagnostic Monitoring Interface가 가능하도록 LD Driver IC 내부에 $RS232^4$ 통신을 이용하여 해당 레지스터 번지에 정확한 값을 입력하도록 프로그램을 설계하고 개발하여 생산현장에 적용하였으며 6-시그마 이상의 효율을 갖는 시스템을 구축하였다.

• 한국정밀공학회지
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• 제16권12호
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• pp.230-238
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• 1999

This paper describes a research work of developing computer-aided design of lead frame, semiconductor, with blanking operation which is very precise for progressive working. Approach to the system is based on the knowledge-based rules. Knowledge for the system is formulated from plasticity theories, experimental results and the empirical knowledge of field experts. This system has been written in AutoLISP on the AutoCAD using a personal computer and in I-DEAS Drafting Programming Language on the I-DEAS Master Series Drafting with Workstation, HP9000/715(64) and tool kit on the ESPRIT. Transference of data among AutoCAD, I-DEAS Master Series Drafting, and ESPRIT is accomplished by DXF(drawing exchange format) and IGES(initial graphics exchange specification) methods. This system is composed of six modules, which are input and shape treatment, production feasibility check, strip-layout, die-layout, modelling, and post-processor modules. The system can design process planning and Die design considering several factors and generate NC data automatically according to drawings of die-layout module. As forming process of high precision product and die design system using 2-D geometry recognition are integrated with technology of process planning, die design, and CAE analysis, standardization of die part in die design and process planning of high pression product for semiconductor lead frame is possible to set. Results carried out in each module will provide efficiencies to the designer and the manufacturer of lead frame, semiconductor.

• 한국정보통신학회논문지
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• 제26권4호
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• pp.503-509
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• 2022

본 논문의 연구 취지는 예측하고자 하는 다음 날과 이전 날의 시가 사이 변동률을 예측값으로 두고 시가를 예측하는 기존 논문들과는 다르게 예측하고자 하는 다음날의 주가 순위를 일정한 간격으로 분할하여 생성된 각 구간마다의 시가 변동률을 예측값으로 하는 모델을 통하여 최종적인 다음날의 시가 변동률을 예측하는 새로운 시계열 데이터 예측 방식을 제안하고자 한다. 예측값의 세분화 정도와 입력 데이터의 종류에 따른 모델의 성능 변화를 분석했으며 연구 결과 예측값의 세분화 정도에 따른 모델의 예측값과 실제값의 차이가 예측값의 세분화 개수가 3일 때 큰 폭으로 감소한다는 사실도 도출해 낼 수 있었다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 추계학술대회논문집
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• pp.296-300
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• 2003

Design of drawing dies used in real industrial environments. It was designed by CAD software in many small & medium companies, but many products require various types, and sizes. Therefore, many companies are required to reduce process time and design mistakes. In this paper, for the automatic design of drawing dies, Design process considered that easy to team and use. which are used with Visual LISP/DCL language in a commercial CAD package, AutoCAD. It has adopted GUI in design system, and has applied DCL language. The system is based on the knowledge base system which is involved a lot of expert's know-how We have built database of design type and detail sizes. The automatic design system requires basic product type and sizes. Then the system accesses to the database and find out sizes by comparing with input parameters and generate drawing dies file.

• 대한교통학회지
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• 제14권3호
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• pp.27-44
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• 1996

The purpose of the thesis is providing a new formulation for the transit assignment problem. The existing models dealing with the transit assignment problem don't consider the congestion effects due to the insufficient capacity of transit vehicles. Besides, these models don't provide solutions satisfying the Wardrop's user equilibrium conditions. The congestion effects are considered to be concentrated at the transit stops. For the transit lines, the waiting times at the transit stops are dependent on the passenger flows. The new model suggests the route section cost function analogous to the link performance function of the auto assignment to reflect the congestion effects in congested transit network. With the asymmetric cost function, the variational inequality programming is used to obtain the solutions satisfying Wardrop's condition. The diagonalization algorithm is introduced to solve this model. Finally, the results are compared with those of EMME/2.