• 통상정보연구
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• 제9권2호
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• pp.161-182
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• 2007

The objective of this paper is to examine the competitiveness of Korean export firms in EU market. In this study, market share index, RCA index, trade specialization index, and market competitiveness index were used as an analytical tool. On the market share index, Korea had a large market share in the SITC section 7(machinery and transport equipment) market in EU. On the RCA index, Korea appeared to have high export competitiveness in the electrical machinery, apparatus and appliances, n.e.s.(not elsewhere specified[stated]), and electrical parts thereof (77), travel goods, handbags and similar containers(83), textile yarn, fabrics, made-up articles, n.e.s., and related products(65), and iron and steel(67) division. On the trade specialization index, however, Korea appeared to tend to decline generally. On the market competitiveness index, Korea appeared to have competitive advantage in the iron and steel(67), machinery specialized for particular industries(72), office machines and automatic data-processing machines(75), electrical machinery, apparatus and appliances, n.e.s., and electrical parts thereof(77), road vehicles(78), and other transport equipment(79) division; but in 29 divisions, the index indicates that Korean firms' competitiveness was low. Finally, the authors discuss the implications of these findings and offer directions for future study.

• 한국화재조사학회논문지
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• 제11권1호
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• pp.66-73
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• 2008

본 연구에서는 한국전기안전공사 서울지역본부 내 전기 전자 제품을 선정하여 각 기기의 전력사용량을 측정하고, 각 기기에 대해 대기전력 차단장치인 세이버 설치 전 후의 대기전력을 측정함으로서 평상시와 전원의 "OFF"시 대기전력을 비교함으로서 절전효과를 조사하였다. 연구결과 대기전력 차단장치인 세이버를 설치하였을 경우 전기 에너지 낭비요인을 원천적으로 제거함으로서 약 18%의 절전효과가 있었으며, 대기전력을 차단함으로서 전기화재를 근원적으로 예방하고 서지 등 이상전압에 의한 충격을 방지함으로서 전기 전자제품의 수명을 연장할 수 있었다.

• 한국화재조사학회논문지
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• 제11권1호
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• pp.9-22
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• 2008

실제로 발생한 화재사건 현장에 대하여 발화부를 확정하고 발화부내에서 발화원인으로 작용한 전기기기 및 제품을 분해하여 객관적인 입증을 도출하였다. 그리고 이와 유사한 사례를 예로 들어 보았다. 실제 산업현장에서 사용되고 있는 전기제품들의 취급 실태 지적하고 개선하여야 할 점과 대책을 검토함으로써 이러한 사례들과 유사한 유형의 화재의 재발을 방지할 수 있도록 기초자료를 제시하였다.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권4호
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• pp.196-200
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• 2004

This paper presents a method to reduce the commutation torque ripple in a position sensorless brushless DC motor drive. To compensate the commutation torque ripple considerably, the duration of commutation must be known. The proposed method measures the duration of commutation from the terminal voltage of the motor, calculates a PWM duty ratio using the measured commutation interval to suppress the commutation torque ripple, and applies it to the calculated PWM duty ratio only during the next commutation. Experimental results show that pulsating currents and vibrations are considerably reduced when the proposed method is applied to a position sensorless brushless DC motor drive for the air-conditioner compressor.

• 전기학회논문지
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• 제63권3호
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• pp.437-443
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• 2014

Electric motors and drives consume the largest amount of electricity more than 40% of global electricity consumption. In addition, motors, drives and its components are included in the global high-trade products and the main driving source for industrial equipment and house appliances. Thus, International standards and regulations for their safety and efficiency are internationally being discussed and created for the protection of its citizens and energy saving. So, understanding the international standards and the regulation of each country is essential to enhance overseas market and to develop product. In this paper, on the basis of this background, status and trends of international standards and regulations are introduced for safety and efficiency of motors and the drives. Safety and efficiency of the IEC (International Electrotechical Commission) standards are introduced in the emphasis. Also, regulations are studied about the differences and trends in each county.

• 조명전기설비학회논문지
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• 제26권4호
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• pp.75-81
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• 2012

In this study, vibration characteristics in according to the load type of cast resin transformer using vibration measurement device were compared. Measurement conditions are the same installation and operation of the three-phase cast resin transformer. If the load increases in transformer using the rotating machinery, the frequency is growing. In the transformer using the lighting and heating loads, it's detected the 55 [${\mu}m/s$] in or outside and 120 [${\mu}m/s$] or more at 60[Hz], the 30 [${\mu}m/s$] in or outside at 120[Hz], and the 70 [${\mu}m/s$] in or outside at 420[Hz]. When increases the loads, it's appeared the 60 [${\mu}m/s$] or less at 450[Hz] or more in rotating machinery, but the velocity of lighting and lighting loads are appeared from 5[${\mu}m/s$] to 115[${\mu}m/s$] inside the 420[Hz] in the same load condition of 20[%]. Through this study, it's verified that there are differences the internal vibration in according to the type of load in cast resin transformer.

• 대한안전경영과학회지
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• 제19권2호
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• pp.81-93
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• 2017

This study aims to investigate laws and standards(including technical guidelines) related to safety criteria for 22 kitchen machines frequently used in commercial kitchens. The study was based on literature survey, interviews with charge persons in kitchen machines manufacturing companies, cafeteria providing group meals and relevant association, and web surfing. The results showed that there are two types of safety criteria such as legally forced ones by laws and optional ones by national industrial standards or technical guidelines. High pressure safety control act, safety control and business of liquefied petroleum gas act and city gas business act prescribed gas use apparatus safety criteria, rational energy utilization act did those of pressure vessel such large rotary caldron, industrial health and safety act did those of food processing machinery, and electrical appliances safety control act did those of electrical kitchen appliances. Compulsory or optional standards or guidelines related to safety criteria for kitchen machines were presented by 22 kitchen machines. Safety devices shown in the laws, standards and guidelines were also summarized by kitchen machines and their risk factors.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권4호
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• pp.312-316
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• 2005

The single phase induction motor has been commonly applied to small-sized electrical appliances because of its low cost, but it has low efficiency and large torque ripple, and it is incapable of speed control. However, two-phase induction motors have small torque ripple, high efficiency and variable speed control, because they are inverter fed. In this paper, the dynamic characteristics of the two-phase induction motor, such as the torque ripple, current and speed, are analyzed by using the time-stepping finite element method, and compared with the cage-type single phase induction motor.

• 한국생산제조학회지
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• 제25권5호
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• pp.362-367
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• 2016

Recently, wireless charging systems have expanded their applications from household electrical appliances to outdoor activity devices. In wireless charging systems, solar cells have versatile advantages, such as abundant raw materials within the earth, reasonable prices of products, and highest power conversion efficiency. In this study, the photovoltaic effect between a silicon solar cell and a photon of infrared wavelength was simulated using a Shockley diode equation. A solar cell power charging system was then set up to: 1) clarify mechanisms of the charging interaction based on the photovoltaic effect with a laser source, and 2) verify interdependency of the parameters: laser settings and geometrical position between a solar cell and the laser. As was observed, the solar cell generates more power when the photon was irradiated uniformly, intensively, and vertically on the surface of the solar cell.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제53권4호
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• pp.224-228
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• 2004

The switched reluctance motor(SRM) drive system provides a good adjustable speed and torque characteristics. SRM has the possibility of maintaining full power over a wide speed range. So, many attempts are being done from home appliances to industrial machinery and tools. Especially, the traction drive of SRM is one of a good application due to it's torque characteristics. However, because of the switching mechanism, it has some disadvantage of noise and vibration. It is difficult to adopt to an appliance demanding silence. A noise simulations and test of 3-phase 6/4, 6/8 and 12/8 SRM were done in other to compare each other. The test results show that 12/8 SRM has good noise characteristics.