• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.656-659
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• 2000

Recently, the skeleton type 2-phase brushless DC motor has been used in electric home appliance for low price and low energy consumption. In this paper, we analyzed a skeleton type 2-phase BLDC motor using time-step finite element method. And the validity of analysis is confirmed by measuring the flux distribution on the surface of permanent magnet and back-EMF. As well, we have calculated the dynamic characteristics of target motor considering the Hall sensor position. So, we have found the optimum switching position, and improved efficiency of 2-phase BLDC motor.

• 산업기술연구
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• 제30권A호
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• pp.9-15
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• 2010

Recently, Smart Grid is a emerging topic in power and communication industry. Smart Grid refers to a evolution of the electricity supply infrastructure that monitors, protects, and intelligently optimize the operation of the interconnected elements including various type of generators, power grid, building/home automation system and end-use consumers. In order to successful implementation of Smart Grid, energy management function will be the key factor that coordinates and optimally controls the various loads according to the operating condition and environments, and the load patterns in residential and commercial building will be required as fundamental element for load management. In this study, we collects many types of energy usage data of electric appliances, analyze their load curves, and make the general load patterns for electrical appliance.

• 가정과삶의질연구
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• 제15권4호
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• pp.81-102
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• 1997

This study intended to investigate factors shaping the styles for comsumers to express their dissatisfaction after comsuming goods(cloth and household appliance) and services(public and health) In particular this study examined what kinds of characteristics were crucial to distinguish three styles of consumers' and public complaints. The characteristics of consumer to be considered in this study included consumer knowledge consumer attitude consumer and several socio-economic characteristics. The sample used in this study were consumers whose age was grater than 20 years old living near Seoul in 1996. Discriminant analysis was conducted to investigate what factors discriminate the style of complaint. This study found that several consumer characteristics were sigificant in explaining different styles for consumers to response their dissatisfactions. The effects of consumer characteristics were more significant in explaining the complaining styles derived from public and health services rather than goods. Overall consumer attitude consumer knowledge and the degree of satisfaction of services were discriminant variables in explaining the styles of consumer complaint. Both consumer knowledge and budgeting skill were significant in explaining complaint styles to response dissatisfaction derived from consuming clothing while both consumer education and time constraint were significant in shaping the kinds of complaining styles derived from consuming household appliances.

• 한국유체기계학회 논문집
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• 제14권4호
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• pp.45-51
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• 2011

The kimchi refrigerator is the electronic home appliance which is used for the maturing and a custody of the kimchi. In this paper, performance improvement of fan and duct system for kimchi refrigerator has been studied by using a commercial CFD code. In order to achieve a improved fan performance, three-dimensional computational fluid dynamics and the Design of Experiments method have been applied. Additionally, to know the optimized duct inlet shape with the optimized fan, the overall performances were calculated with various duct inlet shapes. The final fan and duct system for kimchi refrigerator showed improved performance in efficiency and total head compared with the existing model.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.848-850
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• 2004

Complex sensorless control scheme is difficult to utilize in field of home appliance system because of cost problem. Therefore, it is necessary to introduce simplified sensorless control scheme that is composed of least calculation to estimate the rotor position. This paper presents the principle of the rotor position estimation with comparison of the estimated flux linkage and reference flux linkage. In order to verify the feasibility of control scheme, simulation with MATLAB and experiment is performed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.1013-1015
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• 2004

SRM (switched reluctance motor) provides an excellent 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 applications. Especially, a traction drive of an SRM is one of a good application for it's DC-series characteristic. However, because of the switching mechanism and reluctance torque. it has some disadvantage of noise and vibration. It is difficult to adopt to an appliance demanding silency. Performance and noise tests with 6/4 and 12/8 SRM were excuted to compare the characteristics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.1019-1021
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• 2004

BLDCM(Brushless D.C. Motor) is widely used for industrial application because of high efficiency and high power density. Especially, in servo system and home appliance. BLDCM is very useful due to high control performance and low acoustic noise. In this paper, 2.5HP rated BLDCM controller and drive was developed for tread mill application. The prototype BLDCM has 4 poles rotor and 24 slots stator. Ferrite was used as a rotor magnet due to the cost and temperature characteristic. For the stable operation of tread mill. over current and high temperature can be detected by the DSP controller. For the commutation signal, switching patterns from the sensorless circuit and hall sensor signal are used in the DSP controller.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2006년도 추계학술발표대회
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• pp.265-268
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• 2006

유비쿼터스 컴퓨팅 환경이 확대됨에 따라, 기존의 키보드와 마우스만을 사용자 인터페이스로 주로 사용했던 방법에서 벗어나 좀 더 사용자 중심의 멀티모달 유저 인터페이스 적응이 요구되고 있다. 이에 XHTML+Voice는 음성 및 시각을 모두 제공할 수 있는 새로운 서비스 패러다임으로서 기존의 음성정보만을 제공하거나 시각적인 정보만을 제공하는 시스템과는 달리 XHTML내에 VoiceXML을 삽입함으로써 두 언어의 장점을 모두 활용할 수 있다. 본 논문에서는 VoiceXML의 이러한 장점을 살려 스마트 홈을 구성하는 여러 가전기기들의 인터페이스를 미리 템플릿으로 만들어 두어 모바일 디바이스를 통해 이것들을 제어하는 시나리오를 제안하고 구현하는 방법에 대해 실험하였다.

• Journal of Power Electronics
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• 제13권3호
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• pp.362-368
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• 2013

Commercial home appliances using remotely controlled systems consume electric power while in standby mode to prepare for receiving a remote turn-on signal. The proposed power system can significantly reduce standby power consumption without increasing cost. Furthermore, since a Electronic Double Layer Capacitor (EDLC) is used as an auxiliary power storage element, the life cycle is longer and system reliability can be better than with existing approaches. When the energy of the EDLC is not sufficient for turning on the appliance, the power system charges the EDLC without affecting the main system. The proposed power system is verified with a commercial LCD TV and a 3.93mW standby consumption is obtained. This standby consumption can be regarded as zero standby equipment according to the IEC-62031 standard.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.753-755
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• 2003

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, a traction drive of an SRM is one of a good application for it's DC-series characteristic. However, because of the switching mechanism, it has some disadvantage of noise and vibration. It is difficult to adopt to an appliance demanding silency. A noise simulation of 6/4 and 12/8 SRM was done in order to compare each other, and the design was done carefully.