• 한국항만경제학회지
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• 제29권4호
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• pp.289-323
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• 2013

지구 온난화 현상 이후, 지구환경 변화에 따른 자연 재해는 세계적 규모의 대형 참사로 이어지고 있다. 그중에서도 특히 폭풍해일에 따른 피해가 크게 늘고 있으며, 이에 관한 많은 연구가 진행되고 있다. 우리나라도 예외가 아니어서, 2003년 태풍 '매미' 등이 한반도에 상륙하면서 그로 인한 폭풍해일과 침수 피해로 큰 타격을 입었는데, 특히 마산 지역의 침수는 그 피해 정도와 범위가 가장 막대했다. 이에 따라 국내에서도 향후 폭풍해일 발생에 대한 철저한 대비책 마련의 필요성이 제기되었다. 이에 본 연구는 항만 재해방지시설 건설 시 편익액 산정에 사용되는 대표적인 두 가지 방법론, 즉 비시장 재화의 가치를 추정하는 조건부가치측정법(CVM)과 홍수나 댐 등의 사업에서 주로 이루어져왔던 다차원 홍수피해산정기법(MD-FDA)을 이용하여 마산항 폭풍해일 발생 시 피해액의 편익을 산정, 비교하고자 하였다. 이에 30년 비용의 편익액을 추정한 결과, 조건부가치측정법(CVM)은 2조5689억 원, 다차원홍수피해산정방법(MD-FDA)은 2조9596억 원으로 나타나 재해방지시설의 편익액 차이는 크지 않았다. 하지만 이를 토대로 재해방지시설에 대한 편익 산정에 있어 다차원홍수피해산정방법(MD-FDA)이 이미 비시장 재화를 대상으로 검증받은 방법인 조건부가치측정법(CVM)을 대신할 수 있는 방법인지는 추후 심층검증을 통하여 알아볼 필요성이 있을 것으로 판단된다.

• 산업공학
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• 제10권1호
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• pp.135-143
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• 1997

The importance of training for NC, CNC and Machining Center has been greatly increased. This paper presents implementation of a DNC(Direct Numerical Control) operating software for educational system. This system is able to connect 8-32 CNCs to Control PC with RS232 multi-port serial card. Therefore, it allows much efficiency in training even after costs are considered. The KISCO DNC S/W for above system includes various communication functions, communication parameters setting, program editor and user-friendly environment. This software was developed with C and Windows programming. It was proved in function and stability by iterative field tests.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1328-1331
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• 1996

The importance of training for NC, CNC and Machining Center has been greatly increased. This paper presents implementation of a DNC system and operating software for educational purpose. This system is able to connect 8-32 CNCs to Control PC with RS232 multi-port serial card. Therefore, it allows much efficiency in training even after costs are considered. The KISCO DNC S/W for above system includes various communication function, communication parameter setting, program editor, tool management and user-friendly environment.

• 전자공학회논문지A
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• 제33A권5호
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• pp.65-74
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• 1996

in this paper, the propagation characteristics of the dominant modes in multiple coupled microstrip lines on a magnetized ferrite substrate are analyzed. The propagation constants and characteristic impedances are calculated by using the spectral domain method. With the numerical results, multi-port impedance parameters as well as scattering parameters are derived from nonreciprocal transmission line equations which are consistent with conventional transmission line theory. In additon, the numerical resutls of nonreciprocal characteristics for various values of structural, material parameters, and external magnetic fields are also presented.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1991년도 추계종합학술발표회논문집
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• pp.137-140
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• 1991

The TDX-10 Time Switch architecture has modularity, high reliability and considerable large switch fabric having separated and both-way 1K time slot interchange switching circuit elements. In this paper, we present key functions, architecture, features and traffic characteristic of TDX-10 Time Switch. And we also describe some basic implementation technologies such as Frame Base Read-Write Separation Method, Multi-Write Method and Read-Write Separation Technique with Dual-port Memory.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 D
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• pp.951-953
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• 1997

대규모 과도현상의 모의에는 엄밀한 모델링과 많은 계산부담이 요구되어 이러한 복잡성을 줄이면서도 해의 정확도를 유지할 수 있는 MD법이 제안되었다. 본 논문에서는 MD법을 EMTDC내에서 구현하는 방법에 대해 소개하며 제시된 모델의 타당성을 3상 모의계통에서 축약 전후의 과도전압 파형을 비교함으로써 검증하였다.

• 제어로봇시스템학회논문지
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• 제11권9호
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• pp.816-821
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• 2005

The remote operation of $4\~5$ cranes for container loading/unloading at a port by one operator will dramatically improve loading/unloading efficiency through productivity increase, cost reduction, and so on. This study develops a remote crane control system for container loading/unloading yard cranes. First, a wireless video and audio system to transmit views and sounds of the working field is designed by using 3 web cameras and a microphone. Next, a RSVP-based multi-path reservation method is presented with a view to improving the quality of service in the communication network for remote control. Simulation results show that a RSVP-based multi-path reservation can enhance the reservation success rate in the TCP/IP network.

• 대한산업공학회지
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• 제35권1호
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• pp.58-72
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• 2009

The main activities of container terminals are to load container freights to vessels, discharge them from vessels, and store them in the storage yard. Container terminals make many operational plans to execute these functions effectively. If the plans do not consider enough the loads of related resources, they may have low actualities. This study discusses the optimal yard planning model which considers various resources, such as the storage yard, yard cranes, internal vehicles, and travel lanes, in container terminals. The model determines the groups and amounts of containers which are stored in each storage block by using the resource profile. The yard planning problem is represented to the multi-commodity minimal cost flow problem and is formulated to the linear programming model. In order to explain the application of the mathematical model, the numerical examples are presented. Additionally, the relationship between the average load ratio and the relocation ratio is discussed.

• 한국항해학회지
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• 제14권2호
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• pp.77-82
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• 1990

In this paper the results for thin multi-layer InGaAsP($1.3{\mu}m$)/InP crystal growth by vertical liquid epitaxial growing furnance have been presented. The growth rates of InGaAsP layer and InP layer at cooling rate of $0.3^{\circ}C$/min and the growing temperature of $630^{\circ}C$ were obtained as $0.11 {\mu}m$/min and $0.06 {\mu}m$/min, respectively, by the uniform cooling with two phase solution technique.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2007년도 추계학술대회 및 정기총회
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• pp.183-189
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• 2007

In this paper, we developed the fuzzy group method data handling-type (GMDH) Model and applied it to demand forecasting of educational expenses. At present, GMDH family of modeling algorithms discovers the structure of empirical models and it gives only the way to get the most accurate identification and demand forecasts in case of noised and short input sampling. In distinction to fuzzy system, the results are explicit mathematical models, obtained in a relative short time. In this paper, an adaptive learning network is proposed as a kind of fuzzy GMDH. The proposed method can be reinterpreted as a multi-stage fuzzy decision rule which is called as the fuzzy GMDH. The fuzzy GMDH-type networks have several advantages compared with conventional multi-layered GMDH models. Therefore, many types of nonlinear systems can be automatically modeled by using the fuzzy GMDH. A computer program is developed and successful applications are shown in the field of demand forecasting problem of educational expenses with the number of factors considered.