• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.577-582
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• 2008

The present study has been conducted to study the performance of Dedicated outdoor air handling unit. Dedicated outdoor air handling unit consists of pre-cooler, dehumidification and after cooler. By combining dedicated outdoor air-conditioning and heat pump, a new four-season dedicated outdoor air handling unit has been developed. Amount of energy saved and condition when this new system is superior to conventional vapor-compression cooling system has been presented.

• 한국경영과학회지
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• 제23권2호
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• pp.47-65
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• 1998

We consider a multiperiod capacity planning problem for determining a mix of flexible and dedicated capacities under budget restriction. These capacities are controlled by purchasing flexible machines and/or new dedicated machines and disposing old dedicated machines. Acquisition and replacement schedules are determined and operations are assigned to the flexible or dedicated machines for the objective of minimizing the sum of discounted costs of acquisition and operation of flexible machines, new dedicated machines, and old dedicated machines. In this research, the Problem is formulated as a mixed integer linear Program and solved by a Lagrangian relaxation approach. A subgradient optimization method is employed to obtain lower bounds and a multiplier adjustment method is devised to improve the bounds. We develop a linear programming based Lagrangian heuristic algorithm to find a good feasible solution of the original problem. Results of tests on randomly generated test problems show that the algorithm gives relatively good solutions in a reasonable amount of computation time.

• Management Science and Financial Engineering
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• 제12권1호
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• pp.79-94
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• 2006

In this paper, we readdress a layout design problem, PTL[3], for determining an optimal 3-class-based dedicated linear storage layout in a class of unit load storage systems. Based on some fundamental properties derived, we provide a converging exact algorithm with O(n[logn]), which is more efficient than that of Yang and Kim [8] and can be applied to PTL[K] with $K{\ge}4$ in order to reduce computational execution time. In addition, we prove that the necessary condition suggested by them is also a sufficient condition to PTL[3].

• 한국정보통신학회논문지
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• 제6권6호
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• pp.827-832
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• 2002

고속의 전용회선 통신서비스에 대한 급격한 수요로 통신망은 그 양과 종류가 급격하게 증가하고 있어서 전용회선 통신망 운용에 따른 망구성 및 고장처리 체계의 정립이 필요하게 되었다. 전용회선은 특성상 가입자 구간에서 시작하여 여러 전화국의 전송장치를 경유하고 다시 가입자구간으로 연결된다. 전용회선의 유지보수 및 운용관리는 전국 규모로 전용회선을 단대단으로 시험할 수 있고, 운용관리 업무를 집중화, 자동화, 전산화시킴으로써 전용회선에 대한 시험 및 운용관리업무를 일원화한 집중운용보전체제를 필요로 한다. 이러한 요구에 부응하기 위해서는 확장성이 높고 유연하여 데이터를 원격지에서도 접근할 수 있도록 하는 분산 시스템의 구성이 필수적이다. 분산시스템 설계의 하나의 방법으로 객체지향 설계가 많이 적용하고 있다. 본 논문에서는 새롭게 요구되는 환경에서의 전용회선 통신망에 대한 구성 및 고장관리 요구사항을 정리하고 객체지향설계 언어인 UML(Unified Modeling Language)을 적용한 전용회선운용관리시스템설계 방법을 제안한다

• Journal of Advanced Marine Engineering and Technology
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• 제33권2호
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• pp.288-294
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• 2009

The purpose of this study is manufacturing of monolithic housing for modularization of steering gear. Monolithic housing is difficult to weld with only rotation and linear motion. It is for this reason that housing of joining parts have a slope of 76.3 degrees. For this reason, welding trajectory was measured by the cooperative controled robot system, and then allowing for measured results, we developed the dedicated system. The developed system can be welded by using only 3 axises in contrast with robot system using 8 axises in housing welding. In addition, we applied CMT and laser welding device to dedicated system and as a result of experiment, sound bead and excellent roundness could be obtained.

• 산업공학
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• 제15권2호
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• pp.147-151
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• 2002

Presented in this paper is a prototype of dedicated CAM system for a human bust, not a relief, machining. The input of this system is a STL file which comes from measuring machine, and the output is machining data for a 3-axis CNC milling machine with an index table. The system consists of three main modules, which are shape import and transformation, modeling of jig and fixture, and calculation of machining area. Proposed system architecture and the main modules are briefly described. To get machining region for semi-finish and finish machining stages, two concepts of machining area, machinable and scannable, were tried. Machinable area was suitable for the purpose.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.421-424
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• 2000

본 논문에서는 ITS(Intelligent Transport System) 서비스를 위한 기반시설로 도입이 예상 되는 DSRC(Dedicated Short Range Communication)시스템에 대하여 시스템의 개요와 특징, DSRC시스템을 이용하여 주차장에서의 요금정산을 자동화하기 위한 시스템의 구조 및 구현방법에 대하여 제안하였다.

• Management Science and Financial Engineering
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• 제17권2호
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• pp.23-37
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• 2011

In this paper, we address a layout design problem for determining an optimal 4-class-based dedicated linear storage layout in a class of unit load storage systems. Assuming that space requirement for a class is the sum of the maximum inventory levels of products assigned to the class, and that one-way travel time is a linear function of storage index, we formulate a 4-class-based dedicated linear storage problem PTL[4] and provide an exact splitting algorithm with $O(n{\lceil}logn{\rceil})$. Our algorithms could be applied to more than a 4-class-based dedicated storage layout problem with slight modification in order to reduce computational execution time.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.591-596
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• 2008

The present study has been conducted to study the performance of dedicated outdoor air handling unit in central and personal air-conditioning. With conventional central and personal air-conditioning systems which are designed according to the maximum load, humidity increase above comfort level can not be avoided as the cooling load decreases. The adoption of dedicated outdoor air handling unit, however, can solve this problem. Moreover, the dedicated outdoor air handling unit has the characteristics of anti-bacteria due to dry coil, energy saving and good indoor air quality. During cooling seasons, dedicated outdoor air handling unit can save energy up to 30% than the conventional cooling+reheating system for controlling both temperature and humidity.

• KEPCO Journal on Electric Power and Energy
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• 제8권2호
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• pp.55-59
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• 2022

This paper introduce Renewable Energy forecasting technology, which is a part of renewable management system. Then, calculation method of dedicated transmission line's meteorological data to forecast renewable energy is suggested. As the case of dedicated transmission line, there is only power output data combined the number of renewable plants' output that acquired from circuit breakers. So it is need to calculate meteorological data for dedicated transmission line that matched combined power output data. this paper suggests two calculation method. First method is select the plant has the largest capacity, and use it's meteorological data as line meteorological data. Second method is average with weight that given according to plants' capacity. In case study, suggested methods are applied to real data. Then use calculated data to Renewable forecasting and analyze the forecasting results.