• 한국실천공학교육학회논문지
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• 제5권1호
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• pp.20-27
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• 2013

카운터 밸런싱은 산업현장에서 중량물을 들어 올리거나 운반하는 경우에 부하의 기하학적 형상에 따라 액추에이터에 작용하는 부하가 저항상태로부터 오버러닝 상태로 변화될 때 부하를 안전하게 제어하는 기술이다. 산업현장에서 매우 빈번히 사용되는 기술임에도 불구하고 국내 외에서 설계의 기준이나 실습장치가 없다. 이에, 본 연구에서는 카운터 밸런싱 실습장치 개발에 필요한 아이디어를 내고, 시스템 모델링과 시뮬레이션을 통하여 설계 파라미터를 도출하고 시제품을 제작하여 이 아이디어를 구현하였으며 실험을 통하여 본 실습장치의 유용성을 확인하였다. 본 연구를 통해 개발된 실습장치를 활용하면 학생들이 산업현장에서 만나게 될 카운터 밸런싱 장치의 이해에 큰 도움을 줄 것이라고 기대된다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.1252-1252
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• 2022

Temporary work that utilizes temporary equipment (e.g., system scaffold and system pipe support) in construction work is one of the most vulnerable work from a safety perspective in South Korea. Typically, temporary equipment is reused at construction sites. The Korea Occupational Safety and Health Agency announced guidelines regarding the performance standards for reusable temporary equipment to prevent the accidental collapse of temporary facilities. Nevertheless, temporary facilities' collapse still occurs, which could be attributed to a degradation in the performance due to the reuse of temporary equipment. Therefore, this study investigated the performance of simple temporary structures assembled with new and reused equipment. To this end, an experimental module was designed based on previous research cases, and two experimental models were constructed, in which one was assembled using new equipment (Model A), and the other was built using reused equipment (Model B). To determine the performance of each model, a load test was conducted to measure the maximum load that each model could withstand. The experimental results revealed that the maximum load of Model B was 15% lower than that of Model A. This indicates that there is a meaningful performance difference between those two models. Based on this result, the authors decided to perform additional tests with more realistic models than previous ones. The new experimental module was designed to ensure compliance with the Korean design guidelines. In this presentation, the authors show details of the first tests and their results and plan for the additional test.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.65-67
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• 2003

This paper proposes the cost analysis on the energy efficient equipment when this equipment is participated in the demand-side bidding. Conventional demand-side bidding is exercised through load re-distribution. However if this load reduction is exercised by the use of high efficient equipment, its effect will be assumed to be more economical. This paper analyses this cost-benefit effect of high efficient equipment in the demand-side bidding.

• 드라이브 ㆍ 컨트롤
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• 제18권2호
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• pp.38-45
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• 2021

In recent years, the demand for an onboard scale system which can directly monitor load distribution and overload of vehicles has increased. Depending on the suspension type of the vehicle, the onboard scale system could use different types of sensors, such as, angle sensors, pressure sensors, load cells, etc. In the case of a vehicle equipped with leaf spring suspension system, the load of the vehicle is measured by using the deflection or displacement of the leaf spring. Leaf springs have hysteresis characteristics that vary in displacement depending on the load state. These characteristics cause load measurement errors when moving or removing cargoes. Therefore, this study aimed at developing an onboard scale device for cargo vehicles equipped with leaf springs. A sectional modeling method which can reduce measurement errors caused by hysteresis characteristics was also proposed.

• 한국산업융합학회 논문집
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• 제9권1호
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• pp.79-86
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• 2006

In this study, we research and develope Intelligent Remote management controller. According to the load condition, we will apply various control techniques and plan high efficient Demand control. After development, According to the Demand Control, An electricity enterprisers will expect enlargement of equipment coefficient, elevation of back up load factor and reduction effect of equipment investment. On Customer side, They will expect reduction of electric fee, saving energy and variety of service choice.

• 전기학회논문지P
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• 제52권3호
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• pp.100-106
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• 2003

The increasing application of power electronic equipment in industrial field has led to a growing concern for harmonic distortion and the resulting impacts on system equipment and operations. Harmonic currents are generated by the operation of nonlinear loads and equipment on the power system. These are more increased by unbalance voltage of electrical distribution power systems. This paper describes harmonics characteristics generated by varying of nonlinear load at the PCC under the voltage unbalance.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.867-868
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• 2012

• 조명전기설비학회논문지
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• 제26권10호
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• pp.81-88
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• 2012

Surge protective devices(SPDs) are widely used as a most effective means protecting the electrical and electronic equipment against overvoltages such as lightning and switching surges. When installing SPDs, it is essential that the voltage protection level provided by SPDs should be lower than the withstand voltage of the equipment being protected. But even the proper selection of SPDs are achieved, the voltage at the equipment terminal may be higher than the residual voltage of SPD due to the reflection and oscillation phenomena. This paper was focused on the investigations of the conditions for which the equipment is protected by an SPD taking into account the influences of the protective distance and type of load. The protective effects of SPD with voltage-limiting component were analyzed as functions of types of load and protective distance between the SPD and load. As a result, in the cases of long protective distances, capacitive loads and loads with high resistance, the voltage at the load terminal was significantly higher than the residual voltage of SPD. It was found that the proper installation of SPDs should be carried out by taking into account the protective distance and type of load to achieve reliable protection of electronic equipments against surges.

• 설비공학논문집
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• 제25권7호
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• pp.392-397
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• 2013

To fulfill the demands concerning energy efficiency for zero energy buildings, various technologies of architects and engineers are required. This study aims to estimate the thermal performance of heat source equipment in which part load characteristics are considered in an office building. Overestimation of heat source equipment was reviewed through literature survey, and heating and cooling loads depending on the capacity and division of the equipment were analyzed through a simulation program (DOE-2.1E). The conclusions gained from this study are as follows; 1) The more the division of equipment, the less the heating and cooling energy consumption. 2) When a large item of equipment is divided into two small items of equipment, the optimum application rate showed as 5:5 for chiller, and 7:3 for boiler, respectively.

• 한국산학기술학회논문지
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• 제16권6호
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• pp.4267-4275
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• 2015

조립식 주택은 기존 RC공법과 달리 사전에 전체공사의 약 60-80%를 유닛모듈 형태로 공장 제작하고, 차량을 이용하여 현장까지 운반 후 각 모듈을 결속하여 시공한다. 조립식 주택은 공장제작을 통한 급속시공이 가능한 장점이 있지만, 모듈을 현장까지 운반하는 과정에서 모듈 탈락의 우려가 있으며, 이로 인한 모듈의 변형 및 외장재의 파손이 발생할 수 있다. 본 연구는 기존의 모듈운반 고정장치의 문제점을 분석하고 개선된 고정장치를 제안하였다. 고정장치 개선안을 도출하기 위해 고정장치에 가해지는 운반하중을 몬테카를로 시뮬레이션을 이용하여 분석하고, 비선형 유한요소 해석을 통한 구조적 성능을 검증하였다. 유닛모듈의 하중분포는 통계분석을 통해 3개 유사하중 그룹으로 구분되며, 극단값 분포(Extreme Value Distribution)와 가장 유사한 하중분포를 가진 것으로 분석되었다. 통계분석 및 몬테카를로 시뮬레이션을 통해, 운반하중의 최대값(28.9kN) 및 95% 신뢰도 범위 내 하중값(-1.22~9.5kN)을 계산하였다. 비선형 구조해석 결과는 본 연구에서 제시한 고정장치 개선안이 한계하중 35.3kN까지 파괴가 일어나지 않았으며, 95% 신뢰도 범위 내 하중에서도 충분히 견뎌내는 강성을 지니고 있음을 보여주고 있다.