• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집A
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• pp.149-154
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• 2001

In case of high capacity load force as millions of tons, it is difficult to measure the force with load cell. But we can measure and calculate the force with applied pressure and ram area of hydraulic jack. The 5,200 ton compression load tester is composed of thirteen hydraulic jack with 400 ton capacity. This paper explains the method of measuring the vertical compression load and provides characteristics of unit jack, and displacement of upper structure under maximum load condition.

• 한국정밀공학회지
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• 제30권4호
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• pp.375-382
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• 2013

Down through the years, human needs and desires have required a robot system to work at hazardous environments instead. Current painting task is costly and laborious, and it exposes workers to significant health and safety risks. Automation system offers potential improvement in this area and is especially well suited to the outer-wall painting tasks in concrete structures. This paper introduces the result of gondola-type building management robot(G-BMR) platform and mechanism for moving/tasking on building outer-wall for the outer-wall painting. Its technical and economic feasibility are conducted, and it is concluded that developing G-BMR is physically and economically feasible in this research. And we discuss about the future of G-BMR and automation in construction field.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.73-76
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• 2002

In electrical machinery and apparatus, the most important problem is protect of machinery and apparatus in due to transient phenomena and overload on operation. Particularly by advanced technology of late, there Is demand for low cost of equipments and high percentage of use of equipments. Therefore, protection of machinery and apparatus In condition of overload is more valued considering that all efficiency increase is passed by operating all machinery and apparatus in condition of heavyload. In this paper, the suggested system is added overload interrupt system using CT in condition of overload.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.28-30
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• 2002

In electrical machinery and apparatus, the most important problem is protect of machinery and apparatus in duo to transient phenomena and overload on operation. Particularly by advanced technology of late, there is demand for low cost of equipments and high percentage of use of equipments. Therefore, protection of machinery and apparatus in condition of overload is more valued considering that all efficiency increase is passed by operating all machinery and apparatus in condition of heavyload. In this paper, the suggested system is add overload protect system using CT in condition of overload.

• 대한안전경영과학회지
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• 제7권1호
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• pp.167-178
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• 2005

This study was analyzed to job satisfaction of 318 Instructors who are teaching HapKiDo, a martal art. The analysis is based on social and economic variables such as age, occupation, educational background, income, size of gymnasiums, the number of students, a length of training and the rank of skills (DAN). The study also made some helpful suggestions for better treatment to HapKiDo Instructors. To explore Instructors degree of satisfaction with their jobs. I considered their human relationship, job task, working conditions, compensation, the improvement of professionalism and social status. The study drew some important results.: First, Job satisfaction in terms of human relationship is very high(3.88). wheres the satisfaction in terms of compensation is very low(3.10). Second, the differences in job satisfaction were partially significant in terms of human relationship, job tasks, working conditions, compensation, the improvement professionalism and social status.

• 정보와 통신
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• 제30권10호
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• pp.79-85
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• 2013

By interacting with external wireless sensors, smartphones can gather high-fidelity data on the surrounding environment to develop various environment-aware, personalized applications. In this work we introduce the sensor virtualization module (SVM), which virtualizes external sensors so that smartphone applications can easily utilize a large number of external sensing resources. Implemented on the Android platform, our SVM simplifies the management of external sensors by abstracting them as virtual sensors to provide the capability of resolving conflicting data requests from multiple applications and also allowing sensor data fusion for data from different sensors to create new customized sensors elements. We envision our SVM to open the possibilities of designing novel personalized smartphone applications.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.919-921
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• 1996

Recently, a growing demands on electricity require a high performance and reliable operation in the area of protection, control and monitoring of power plants and substations which may not provides with conventional systems. This paper describes a novel IDPACS (Integrated Digital Protection And Control System) in which we integrate all protection, control and monitoring function of the substations. The simulation results show that the proposed system provides fast response and reliable operation of power plant with superb performance on protection and control system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.912-914
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• 2003

고전압 차단기용 액츄에이터는 솔레노이드, 파이로트 밸브, 유압 실린더로 구성되어 있으며, 차단기의 동작은 솔레노이드 액츄에이터의 동작에 의해 결정되기 때문에 솔레노이드 액츄에이터의 동작특성을 정확히 예측할 수 있어야 한다. 그러므로 차단기의 동작 성능을 개선하기 위해서는 솔레노이드 액츄에이터의 동작 특성을 정확히 해석하여 동작 특성에 영향을 미치는 인자를 알아내는 연구가 선행되어야 한다. 본 논문에서는 고전압 차단기용 솔레노이드 액츄에이터의 과도상태 특성을 해석하여 응답 특성에 영향을 미치는 요인을 확인하고, 솔레노이드 액츄에이터의 응답특성을 개선시킬 수 있는 방법을 제시하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 추계학술대회 논문집
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• pp.209-212
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• 2002

In electrical machinery and apparatus, the most important problem is protect of machinery and apparatus in duo to transient phenomena and overload on operation. Particularly by advanced technology of late, there is demand for low cost of equipments and high percentage of use of equipments. Therefore, protection of machinery and apparatus in condition of overload is more valued considering that all efficiency increase is passed by operating all machinery and apparatus in condition of heavyload. In this paper, the suggested system is add overload protect system using CT in condition of overload.

• 상하수도학회지
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• 제19권2호
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• pp.228-237
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• 2005

The main purpose of this study was to investigate the red water reducing effects of phosphate based inhibitor when it was applied to water distribution system. The effects of pH, alkalinity, calcium concentration in the reduction of the red water also studied. The most finished water in Korea showed relatively high corrosiveness and was required to introduce some types of corrosion reducing methods such as addition of alkalinity. The precipitation of $CaCO_3$ by addition of $Ca(OH)_2$ formed porous film on the surface of the carbon steel pipes and was displaced easily from the surface of the pipes; on the other hand, addition of zinc phosphate (ZOP) formed reliable film on the surface and reduced iron release and color. Although the main function of ZOP was to suppress the release of Pb and Cu, it also reduced iron concentration released from water distribution pipes.