• International Journal of Safety
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• 제7권1호
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• pp.15-20
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• 2008

The primary goal of this study is to analyze fire hazards of electric home appliances such as electric iron and electric heater using fault tree analysis(FTA). A fault tree(FT) is constructed and used to analyze fire hazards in electric home appliances. The fault tree is built from events that may occur in electric home appliances. The failure rate of basic events are derived from the value of experimental results and reference. And an algorithm analyzing fire in electric home appliances is suggested. We show how fault tree analysis, carried out by means of failure rate, is able to diagnose fire hazards of electric home appliances in a precise manner. We present numerical results such as fire probability of electric home appliances, importance measure, fire cause, etc. It can be helpful in preventing the fire hazards in electric home appliances.

• 한국기계가공학회지
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• 제20권7호
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• pp.41-47
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• 2021

In this study, the hinges of heavy weight doors were designed and analyzed in line with the trend that built-in appliances are becoming larger and the weight of doors is also increasing. The main specification of the heavy weight door hinge is to allow the deflection at the end of the door to be less than 2 mm when opening and closing, including the automatic closing, slow closing, and closing force control functions. The structural analysis of the design mechanism, component design, and methods for improving the deflection are as follows: 1) Mechanism of the automatic closing function should sense automatically using the spring compression force at a specific angle by the contact between the cam and the cam module roller. 2) Through structural analysis, the maximum stress of the door was found in the link pin hole connected to the pin at each link. 3) Consequently, the pin holder was designed and applied, with little variance, but up to 93% of the specification limit.

• Journal of Electrical Engineering and Technology
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• 제7권1호
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• pp.51-57
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• 2012

This paper provides a safety guideline for DC supplied home appliances through the comparative analysis of existing safety guideline for AC supplied home appliances. For this purpose, a predictive DC home appliance model is suggested and in special international safety standards of AC appliances are also analyzed. Moreover, a DC distribution system is built to verify the validity of the proposed safety guideline. The detailed analyzing process is explained with help of informative experimental results.

• 산업기술연구
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• 제24권A호
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• pp.83-90
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• 2004

Generally, electronic appliances are used on the basis of normal power source supply. The power source inevitably includes the abnormal condition, such as, sudden voltage sagging, power interrupt, and induced noises. As the electronic appliances which include micro-controller-based circuits are being increased recently, the controller circuit sometimes malfunctions by the abnormal condition of the power source. This situation causes serious problems such as hitch of electric appliance, fire and medical instrument glitch, which produces serious situations. In this paper, development of power interrupt tester which is highly suitable for an endurance test device under abnormal power source to microprocessor-based circuits is proposed 89C2051 microcontroller is performed to make power interrupt signal, and software controls peripheral hardwares and built-in functions. Experimental results of this study will offer a good application to electronic appliance maker as a test device of hardware and software debugging use.

• 헤리티지:역사와 과학
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• 제33권
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• pp.36-67
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• 2000

Square-shaped moated burial precincts(方形周溝墓) can be classified into type I that has bridges only at the comers, type II that has bridges at the comers and sides, type III that has bridges only at the sides, type IV that is surrounded by the moat without bridges, type V that has its sides less than those of type I ~ V by 1 or 2, and type VI that has the round-shaped ground. But the time differences among the types are not known yet. For the burial appliances of square-shaped moated burial precincts, there are stone coffins, pit burials and jar burials. The major burial appliances situated in the mound are stone coffins and pit burials, and jar burials are subsidiary appliances that were buried at the shoulder part of the mound or at precincts. According to the case of Gwanchang-ri KM423, grave mounds, which arc closely related with the burial appliances, were built by heaping up the earth in and around the precinct as low as only enough to protect the burial appliances. Considering the relics unearthed in the burial compartment of KM437, the time when square-shaped moated burial precincts were formed is estimated to be the age when Songguk-ri type earthenware and clay stripes earthenware co-existed. It was the early Iron Age when ironware began to sp read in this country. Emerging first in that age, square-shaped moated burial precincts were presumably formed until around the end of BC or the beginning of AD, when KM404 and KM423, which were unearthed with plain earthenware, grey earthenware and ironware, were formed. When analyzing the form of small-sized graveyards in precincts, the unearthed relics and the locations, the people who formed square-shaped moated burial precincts were considered as those who had a culture comprising clay stripes earthenware, which appears newly in the Songguk-ri type earthenware of native, and ironware, and a settled agricultural society based on paddy fields and labor forces of family units.

• 한국가구학회지
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• 제19권1호
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• pp.66-74
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• 2008

This paper reviews a new kitchen space by analyzing the user life style and their house environment where ubiquitous system is considered. The kitchen space where ubiquitous system is applied was differ in their house atmosphere and the role of kitchen area. Those changes under ubiquitous system has the kitchen becomes the central space of the house and the furnishings including home appliances and furnitures. This furniture and built-in machine will get a communication ability with user in the living and kitchen space. And it will include a high technology like as RFID, home network and so on.

• 전자공학회논문지CI
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• 제44권3호
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• pp.57-67
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• 2007

모바일 증강 현실 분야에서는 이동성이라는 특성으로 인해 발생하는 기술적인 난제들의 해결에 주로 많은 관심을 두어 왔다. 그러나 이러한 기술적인 난제들뿐만 아니라 유비쿼터스 컴퓨팅 환경에서 사용자의 상호작용을 위한 서비스 인터페이스 및 콘텐츠 제공에 관한 문제들도 동시에 고려되어야 한다. 본 논문에서는 유비쿼터스 컴퓨팅 환경에서의 모바일 증강 현실 기반환경 제어, 미디어 콘텐츠의 개인화, 선택적 공유 및 협업의 개념을 포함하는 맥락 인식 모바일 증강 현실 (Context-Aware Mobile AR) 시스템을 제안한다. 유비쿼터스 컴퓨팅 인프라의 발전으로 눈에 보이지 않는 컴퓨팅 리소스들로부터 획득되는 환경 및 개인의 맥락정보와 미디어 콘텐츠 활용의 용이성이 증가하고 있다. 하지만 사용자들이 눈에 보이지 않는 수많은 스마트오브젝트들을 인지하기가 어려우며, 인터페이스의 복잡성으로 인하여 스마트 오브젝트들을 제어하는 것 역시 쉽지 않다. 또한, 유비쿼터스 환경에 대한 고려 없이 사용자들에게 다양한 종류의 방대한 미디어 콘텐츠를 일방적이고 일괄적인 방식으로 제공하는 것은 사용자들에게 혼란만 가중시킬 것이다. 따라서, 제안된 시스템은 맥락 인지 기술과 모바일 증강 현실 기술을 접목하여 개인화된 스마트 오브젝트 컨트롤과 개인화된 미디어 콘텐츠의 증강 및 선택적인 공유를 가능하게 하고자 한다.

• 한국태양에너지학회 논문집
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• 제40권3호
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• pp.21-31
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• 2020

The government mandates gradually zero energy building and Photovoltaic power generation systems installed in buildings are emerging as the most realistic alternative to increase the independence rate of building energy. In this study, we propose a method to reduce the power consumption of households by increasing the PV capacity of balconies and applying the method used the charged electric power stored in batteries after sunset. In order to evaluate the electric power energy savings of the residential BESS, a balcony PV 1.2 kW and a battery pack 2 kWh were installed for 9 houses in 4 apartments in Seoul and Gyeonggi-do. The BESS is charged when the balcony PV is generated electric power, and when solar power generation is finished, it supplies power to the electric appliances connected to the load. As a result of installing the solar PV module 1.2 kW and 2 kWh class BESS for 3 households located in Seoul and Gyeonggi-do, the average electric power consumption saving rate was 40%. The reduction in electricity consumption in the case of zero generation surplus power by maximizing the utilization rate of BESS has been improved to about 53%. Therefore, in order to increase the self-sufficiency rate of electric energy in apartment houses, it is effective to increase the solar photovoltaic capacity of the balcony and apply the residential BESS. In the future, it is believed that the balcony PV and home BESS will play a key role in achieving mandatory zero-energy housing.

• 한국컴퓨터정보학회논문지
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• 제7권2호
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• pp.143-154
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• 2002

최근 인터넷이 발달함에도 불구하고 신형 장비들은 이더넷 포트를 내장하고 있으나, 구형 장비들은 시리얼 포트가 내장되어 있는 경우가 많다. 따라서 이를 유지 보수하기 위해서는 원격지에서 모뎀을 통하여 작업을 하거나 직접 기기 앞에서 작업을 해야 하는 번거로움과 낭비가 있다. 본 연구를 통하여 시리얼 장비중 특히, 교환기들을 이더넷상에서 통제하고 관리할 수 있도록, 임베디드 보드에 실시간 리눅스 운영체제 및 기타 응용 소프트웨어를 구축한 실시간 임베디드 시스템을 개발한다. 테스트 결과 원격지에서 시리얼 교환기에 접속할 수 있었으며, 상태 체크 및 제어가 가능함을 확인하여 기타 시리얼 장비들에도 응용 가능함을 확인하였다

• 전기의세계
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• 제18권2호
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• pp.7-14
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• 1969

From the first customer located right at the substation to the last customer at the end of the line, voltage must be held within close limits, so the voltage regulation is more important than the thermal limit. On a typical distribution system during the peak load period, the voltage drop may be serious enough to cause unsatisfactory operation of home appliances in the residential area, and present many problems to manufacturing industries, where the voltage must be maintained within close limits to insure smooth operation. Among all the factors contributing to voltage drop in the distribution system, the voltage drop in the distribution transformer may account for 30% of this figure. If we can eliminate this factor, the power companies can provide better quality electricity to more customers with the existing distribution facilities, thus saving on initial investment costs. Taking all these problems into consideration, the author undertook the design of a capacitive transformer which would give zero voltage drop at rated load and at 80% lagging power factor while incorporating overload features to withstand 400% overload for at least 100 seconds. The following are the results obtained through design, manufacture and test of an initial experimental transformer built with these specific purposes.