• Title/Summary/Keyword: Equipments

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A Study on the Safety Diagnosis for Power Systems Using a UV Camera (자외선 검출 카메라를 이용한 전력시스템의 안전진단에 관한 연구)

  • Yu, Byeong-Yeol;Kim, Chan-O
    • Journal of the Korean Society of Safety
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    • v.27 no.1
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    • pp.7-13
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    • 2012
  • This paper describes the diagnosis techniques using UV images taken in the field under energized condition of power equipments in order to figure out and analyze the abnormal states on the terminals of power equipments. To classify the features of the terminals, the counted No. of the corona generated at the terminals is defined. According to the result detected, the No. of corona detected on the power equipments installed inside a building is less than that installed outside a building, and it strongly depends on the environment and installed condition. Thus, the environmental condition needs enhanced, and stable operation by the periodic inspection under energized condition of the power equipments is required. Especially, the event counting technique using UV camera is useful for the power equipments apart more than 20 m to apply, and there can be an error due to the features of the sensing techniques when the distance between the user and the objects is close less than 15 m. Therefore, the experimental result shows that event counting technique is employed in the case of the distance more than 15 m. The electrical safety can be ensured by using the UV detection technique and the criteria.

Feasibility Study on Retrofitting Lighting and Heat Source Equipments in Office Buildings (사무소건물 조명기기와 열원기기의 고효율기기로의 교체에 관한 경제성 검토)

  • Lee, Chul-goo;Kim, Jong-dae;Im, Tae-soon
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.12 no.2
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    • pp.13-18
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    • 2016
  • Energy saving has been main concern, thus government supporting policies which are based on Fundamentals of Low-carbon Green Growth Act', 'Green Building Support Act, have been prepared in Korea. The objective of this study is to estimate energy conservation effectiveness and economic advantage assuming that lighting equipments and heat source equipments would be retrofitted. Office building, which has total floor area of $30,000m^2$, was a subject of this study. From the estimations, electric rate will be decreased by 62,886,000 won per year due to lighting equipments retrofit, and gas rate will be decreased 11,141,000 won or 17,332,000 won per year due to heat source equipments retrofit (in case of COP 1.2 or 1.5). Payback period of each case that are calculated by energy saving cost and retrofit cost are estimated 27.9 year, 38.6 year and 29.2 year, thus economic supporting policies is necessary for effective energy saving in buildings. Meanwhile payback period of heat source equipment for new building is estimated 6.1 year and 8.3 year.

A Study on the Propagation and Attenuation Properties of the Military Construction Equipments Noise (군(軍) 건설장비 소음의 전달 및 감쇠특성에 관한 연구)

  • Ju, Duck-Hoon;Kim, Jae-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.9
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    • pp.797-804
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    • 2010
  • In case of the construction equipment using by the military camp, such equipments are different from those equipments using at general construction site, of which muffler(silencer) is attached at the passenger seat side, since such equipments are obsoleted, it is great part that a considerably loud noises are continuously diffusing. When working, such noise can be influenced a lot of effects to those working soldiers nearby the equipment, and though it is really terrible loud noise as much as can arise a civil complaints by neighboring civilians, but because its specialty of the military, it is real state that there are many difficulties in establishing an effective soundproof countermeasure due to study shortage and lack of the relevant material regarding to military construction equipment. Accordingly, this study has ever grasped the characteristics of noise by its each frequencies and by distances about those 9 kinds of construction equipments using chiefly by the military camp. As the result, it was known that the military construction equipment is generating the loud noise which can influence bad effect to the workers, and such high sound pressure level of low frequency band can harm even to far distance.

Establishment of Standard of Property Control for Angiographic Equipments (혈관조영장비의 성능관리 기준개발)

  • 임현수;김부길
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.41 no.6
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    • pp.61-66
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    • 2004
  • To make a guide line of property control of angiography equipments, we made standard evaluation sheet forms of facility and management of angiography suite, physical properties of angiography equipments, and image quality of film and then surveyed them at 29 hospital nationwide. Survey and development of standard evaluation sheet form of physical properties of angiography equipments. By using resolution & radiation dose, physical properties of angiography equipments of 49 in number nationwide were evaluated. Most of them (91%) had good performance.

The Analysis Method on the Reliability of the School Network (학교 전산망 통신장비의 신뢰성 분석기법)

  • Lee, Joa-taek;Song, Ki-sang
    • The Journal of Korean Association of Computer Education
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    • v.3 no.2
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    • pp.77-86
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    • 2000
  • As the information technology is being rapidly developed, Korean government supplies various communication equipments to schools and therefore, it causes difficulties to cope with various faults from complicated school network communication equipments. These faults come from many reasons for wasting school budget and decreasing effectiveness in school administration. From this, it is necessary to figure out the problems of school communication equipments and cope with these problems quickly and preventing those faults in advance. In this paper, we present the school communication equipments analysis methodology not only quantitative but also qualitative aspects. We are sure that applying this methodology may improve the effectiveness of school network equipments management.

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Active Vibration Control of a Precision Equipment on Flying Vehicle Structure (비행 구조물에 탑재된 정밀 기기의 능동 진동 제어)

  • Lee, Jae-Hong;Yu, Jin-Hyeong;Park, Yeong-Pil
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.23 no.11
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    • pp.1912-1921
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    • 1999
  • The equipments mounted on guided-missile undertake heavy vibrational disturbance. Sometimes the equipments mounted on guided-missile go wrong so that the guided-missile flies over unintended place. For the vibration isolation of the equipments mounted on guided-missile, active vibration control was performed. In the case of active vibration technique, the stiffness matrix and the mass matrix are derived based on FEM (ANSYS5.0). Model reduction was carried out and, as a result, we got 7 DOF mass and stiffness matrix. For the sake of FEM model identification, modal experiment was carried out. With the help of Sensitivity Analysis, the natural frequencies of FEM were tuned to those of Experiment. In this work, the Sky Hook and the LQG control theory were adopted for v iteration control using stacked piezoactuator. Experiments were performed with changing excitation frequency from 10 Hz upto 200 Hz and we got frequency response function of guided-missile equipments. The magnitude of 3rd mode of guided-missile equipments is 8.6 % that of Uncontrolled in Skyhook controller and is 3.4 % that of uncontrolled in LQG controller.

An Investigation into the Actual Condition of Electrical Equipments Installation for the Inspection Method Development Based on IEC 60364 (IEC 60364기반 건축전기설비 점검기법 개발을 위한 현장실태 조사)

  • Jung, Jin-Soo;Han, Woon-Ki;Lee, Han-Sang
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.5
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    • pp.36-41
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    • 2009
  • In this paper an Investigation into the actual condition of electrical equipment installation for the inspection method development based on IEC 60364. The analysis objects are the difference between electrical equipments installation in korea & electrical equipments installation based on the IEC 60364. The measurement elements are loop impedance, operating characteristic of circuit breaker and protective conductor continuance. As a result, the korea electrical equipments installation was almost same the TT system but some different of protective conductor continuance. Electrical equipments installed TN-C-S has noting problem about installation but manager dose not understand about IEC 60364.

A Development of the On-line Maintenance and Management System for the HVAC Systems and the Evaluation of Its Effects (공조설비 온라인 유지관리시스템 개발 및 효과분석)

  • Lee, Tae-Won;Kim, Yong-Ki;Woo, Nam-Sub
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.21 no.11
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    • pp.591-598
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    • 2009
  • The service quality with the various building equipments tends to depend on the individual superintendent's capability and efforts generally and this often lead to poor maintenances and managements of them. N-BMS(Networked Building Management System), proposed in this study, is a new type of building management method, which links principal equipments within many buildings into a communication network and carries out several significant missions such as fault detection, deterioration diagnosis and control the equipments and so on, as well as monitoring which is the main and unique purpose of the conventional BMS. How to construct the N-BMS was considered to keep performance of equipments high and thus to save energy and resource. LCC(Life Cycle Cost) based analysis was also performed in order to verify the effects of some maintenance and management works for the building HVAC systems.

A Study on Optimization of Propulsion Systems for Series Hybrid Electric Vehicles Considering Mission Equipments (임무장비를 고려한 직렬형 하이브리드 차량의 추진시스템 최적화 연구)

  • Jang, Myeong-Eon;Kim, Sang-Man;Han, Kyu-Hong;Yeo, Seung-Tai
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.2
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    • pp.225-232
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    • 2013
  • In this paper, the study was conducted on the subject of the hybrid electric vehicles used by the military, and optimized the propulsion system for fuel economy considering energy supply to the mission equipments. For the analysis of the vehicles, a method based on the geometry and some assumptions was applied with basic vehicle dynamics. The sources of energy supply in the military hybrid electric vehicles are an engine, a battery and an ultra-capacitor. The optimal operation point among an engine, a battery and an ultra-capacitor can be found by minimizing energy consumption of driving power train and mission equipments. In the study, it was possible to find the optimal propulsion system by comparing fuel efficiency of the vehicles during the driving cycle.

A Development of Indicators to Decide Replacement Priority for Medical Equipment in Hospital (병원 의료장비 교체 우선순위를 결정하는 지표의 개발)

  • Park, Jun;Lee, Mi-Young;Kim, Ki-Tae
    • Journal of the Korean Operations Research and Management Science Society
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    • v.37 no.4
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    • pp.161-180
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    • 2012
  • We develop some evaluation tool and indicators for the scores for medical equipment replacement in hospital. There has been no research for Korean hospitals although there are many for foreign medical institutions. In this paper, among many variables that were obtained from the previous studies, eleven variables are selected as indicators and tied as three groups. And then we obtain scores of medical equipments based on the weighted values of those indicators. We can make decisions whether we replace medical equipments or not by ranking the medical equipments based on the scores. This paper shows that we can make decisions to replace medical equipments very objectively and effectively using the evaluation tool and indicators we develop.