This study is designed to predict the overall electric power load, to apply the method of time sharing and to reduce simultaneous load factor of electric power when authorized by user entering demand plans and using schedules into the user’s interface for a certain period of time. This is about smart grid, which reduces electric power load through simultaneous load factor of electric power reduction system supervision agent. Also, this study has the following characteristics. First, it is the user interface which enables authorized users to enter and send/receive such data as demand plan and using schedule for a certain period of time. Second, it is the database server, which collects, classifies, analysis, save and manage demand forecast data for a certain period of time. Third, is the simultaneous load factor of electric power control agent, which controls usage of electric power by getting control signal, which is intended to reduce the simultaneous load factor of electric power by the use of the time sharing control system, form the user interface, which also integrate and compare the data which were gained from the interface and the demand forecast data of the certain period of time.

Recently, odor and white smoke emitted from textile industry has emerged as a social problem. Most of pollutants from textile industry is due to the emissions from tenter facility, and in many case wet scrubber is widely used for treating this waste gas from tenter facility. However, it is still difficult to improve the environment of textile complex because of low treatment efficiency. For this reason, we carried out the EFC (Electric Fume Collector) pilot test (50 CMM) for removing odorous substances from waste gas emitted from tenter facility. EFC is a kind of wet electrostatic precipitator. As a result of this study, pollutants and white smoke were eliminated effectively and quite large amounts of oil could be recovered.

Electric night storage heater was introduced and disseminated for power grid balancing and efficient management of power generation facility. But fuel cost for heating has been increased rapidly while the cost of electricity increased slightly. This abnormal rate system caused peak load in winter at last. To solve this problem, application of an air source heat pump was suggested. In the study, the effect of replacing night heater by heat pump and the economics were analysed. In addition the expectation of prospect of heat pump penetration was simulated based on surveyed and investigated data. As a result, fund supporting as well as institutional backing was needed for effective propagation and return of investment.

To address global climate change, various governments are investing in electric vehicle research and, especially in Korea, the application of electric vehicles to public transportation. The lithium batteries used in electric vehicles typically have an exp

Toner Display is based on an electrical movement of charged particles. Two types of black and white toners charged in the different electric polarity are enclosed in the air space between two electrodes. The particle movement is controlled by the external electric field applied between two transparent electrodes. The black toner is collected to the electrode by an electrostatic force across the insulating layer to display a black image. The white toners can be put back to the counter electrode by applying a reverse electric field, and white solid image is displayed. We have studied on the movement of three color particles independently to display color image in Color Toner Display. Two positively charged color particles with different amount of charge to mass ratio and negatively charged white particles were enclosed in the toner display cell. Yellow, cyan and white images were displayed by an application of voltage.

근래에 전기추진선박의 필요성이 대두되고 있으며 특수선박을 시작으로 건조가 증가되고 있는 실정이다. 하지만 선박은 운항 환경에 따라 추진기의 출력 토크 및 속도의 변동이 심하므로 전기추진시스템에 큰 영향을 미친다. 대표적으로 출 입항시, 정상상태의 대양 항해시, 황천 항해시에 선박 추진시스템의 토크 및 속도 변동이 짧지만 빈번하게 변동하게 되므로 전기추진시스템의 전력변환장치에서 전류 및 전압파형에 고조파가 크게 포함되어 발전기, 변압기, 컨버터, 인버터 및 추진전동기에 손실의 증가, 기기의 열화 및 토크 맥동 발생 등의 좋지 않은 영향을 미치게 된다. 본 연구에서는 선박의 운항 환경에 따른 추진시스템의 전류 및 전압파형에 포함되는 고조파 함유율을 분석하였다. 분석 결과 저속 영역에서의 잦은 속도 및 부하 변동에 따라서 전동기에 공급되는 전류 및 전압 파형에 포함된 총 고조파 왜형율과 전동기의 토크 맥동이 증가됨을 확인할 수 있었다.

Electric motors in electric vehicles has quite fast torque response, thus fast minor feedback loops can be applied for vehicle slip control. In this study, a model following control based slip ratio controller is suggested. This paper introduced a novel strategy of control for wheel slip in electric vehicle by computer simulations. This paper suggested that the control strategy in this paper can control the driving motor torque to drive the wheel on the slippery road surface.

The cost to electricity is cheaper at night due to electric supply and demand policy in Korea. During daytime the loads are higher and extra generators are brought "on-line" to meet the demand. In the middle of night loads are lower and they need to throttle back the generators. So KEPCO (Korea Electric Power Corporation) offers "time of use" (TOU) rates to balance the grid load. The night storage heaters are generally on a separate circuit which is only switched on when the night rate is activated. Since 2000 the price of NG, kerosene and other petroleum based fuel for heating has been increased rapidly and overtook the price of electricity at last, so more and more people have chosen night storage heaters to save energy price. Currently about 900,000 customers are using electric night heaters and this causes shift of peak demand time to night in winter and increase of deficit spending. To solve this problem, replacing electric night heater by air-source heat pump has been proposed. An air-source heat pump can provide efficient heating and cooling for building, especially in a warm climate. When properly installed, an air-source heat pump can deliver one-and-a-half to three times more heat energy to a building than the electrical energy it consumes. This is possible because a heat pump moves heat rather than converting it from a fuel, like in combustion heating systems.

경상대학교 교내에 설치되어 있는 1-2W형 온실을 대상으로 전기 방열기를 이용하여 국화 재배온실의 난방효과를 검토한 결과는 다음과 같다. 실험기간동안 최고, 평균 및 최저 외기온은 각각 -3.8～21.3℃, -5.2～16.1℃ 및 -12.5～14.4℃ 정도의 범위로 나타났으며, 온실 내외의 평균상대습도 각각 43.5～98.6% 및 35.2～100%로 나타났다. 12월 중순부터 2월 상순까지 최저 외기온은 대략 -5.0～-10.0℃ 전후로 나타나 진주기상대의 최근 자료와 비교하면 상대적으로 최저기온이 낮게 나타나는 경향이 있었다. 야간의 경우, 방열기 직하부의 엽온이 방열기 중간 지점에서 측정한 엽온 보다 크게 2～3℃정도 높게 나타나거나 또 는 미미하지만 약간 높게 나타나는 경향이 있었다. 근권부의 경우, 직하부나 중간 지점에서의 온도 차이 는 거의 없는 것으로 나타났고, 근권부의 최고온도와 기타 최고 온도의 발생 시점을 보면, 약 2시간정도 의 지체현상이 있음을 알 수 있었다. 그리고 실험기간동안 난방에 소요된 총 소비전력량, 공급에너지 및 총 난방비는 각각 2,800kWh, 2,408,000kcal 및 112,000won 정도였다. 화석연료인 경유로 난방할 경우, 총 난방비는 224,500won 정도였다. 방열기를 이용하여 난방할 경우, 난방비를 약 50% 정도 줄일 수 있을 것 으로 판단되었다.

고령화 사회에 대한 준비가 여러 다양한 분야에서 진행되고 있으며, 사회 각 분야에서도 이에 관련된 사업들이 활발히 진행중에 있다. 또한 일찍 고령화 사회에 진입한 여러 국가들도 실버산업에 관한 계속적인 연구를 통해 고령화 사회의 여러 문제점들을 해결해 나가고 있다. 이러한 이유로 본 연구는 실버제품이 가지는 여러 특성들 중 거부감에 대한 연구를 진행하였다. 일반적으로 거부감은 경험에 의해 장기적으로 형성되어온 감정적 태도라고 할 수 있는데, 이러한 거부감이 실버 그룹과 일반인 그룹에서 어떻게 나타나는지를 연구하였다. 연구를 통해 거부감은 의미적 거부감과 형태적 거부감으로 나타나는 것을 알 수 있었으며, 실버 그룹에서는 형태적 거부감보다는 의미적 거부감에 민감한 반응을 보이고, 일반인 그룹에서는 의미적 거부감과 형태적 거부감에 모두 반응을 하는 것을 알 수 있었다. 이러한 결과를 통해 가설을 세우고 이를 검증하기위한 단계로 노인용 전동 휠체어를 통해 가설에 대한 검증을 실시하였다.

최근 온실가스 감축을 위한 세계 각국의 노력이 다각도로 진행되고 있으며, 국제적인 협력 또한 시급히 요구되고 있다. 이러한 노력의 일환으로 해운 업계에서는 항내에서 유발되는 선박 기인 온실가스 배출량 중 탄소에 대한 배출량 감축과 선박운항 비용 절감을 위한 친환경 항만 체계 구축 방안이 활발히 논의되고 있다. 이 논문에서는 탄소 배출량 감축 및 친환경 항만 체계 구축의 기초 연구로 정박 중인 선박에 자체 생산 전력을 공급하는 대신 육상전력을 공급하는 방안을 모색하였다. 이를 위하여 실제 운항중인 목포해양대학교의 실습선 새누리호를 대상으로 정박 중인 선박이 육상전력을 사용함으로써 얻을 수 있는 환경적 비용적 효과에 관해 고찰하였다. 연구 결과 육상전력을 사용한 경우에 CO2 배출량은 약 32.5%가 감소되었고, 운항비용은 약 33%가 절감된 것으로 나타났다.

In general, electric powered wheelchair is used for handicapped persons as a means of movement. Electric powered wheelchair is controlled via joystick, which means that seriously handicapped person as vertebra damaged person can not use the general electric powered wheelchair. In this paper, a new navigation method for an intelligent electric powered wheelchair is proposed, which is very simple to implement by using the robotic technology. Two cameras are used in the system. The one is used for detecting obstacles in front of the wheelchair, and the other is used for detecting the intention of the user by measuring the movement of the head. A series of experiments are performed to evaluate the proposed method and the experimental results show that the proposed method can be applicable to the navigation of an intelligent electric powered wheelchair for seriously handicapped person of vertebra damage.

The Automobiles with a combustion engine use a transmission for increasing drive force, reverse-move and maintaining non-load condition in general. In the Electric automobile system, output-axial can be operated just by controlling the motor manipulated with power. It also does not need reverse-gear by rotating the motor in the opposite direction. Designed to assemble two different types of planetary gear ratio and to be input torque of input-axial in sun gear and divide ring gear Ⅰ, Ⅱ and then after one of ring gear is fixed, in accordance with the planetary gear velocity ratio, the first gear has 0.136 decreased speed and second gear has 0.240 decreased speed, separately. While the planetary gear type transmission showed over the 92% of efficiency in the all of velocity range. The transmission proposed in this study can be expected to apply to the electric vehicle or others.

Most world-leading companies are aware that Environment and Health and Safety Issues are critical to the product quality and sustainable growth of their company. Environment-friendly efforts are seen in almost all aspects of business operations in an adva

In the fire there are fusion signs and damage by fire, and insulation aging and carbonization of the electric wiring in the ignition spot because of special characteristic of the appliance in the electricity fire. Because of the physical factor applied in the damage of fire, the decision of ignition spot by eye investigation is insufficient. In this paper, the cause of electricity fire is researched. The focus is on the operation state of operated MCCB(Molded Case Circuit Breaker) at the time of electricity fire. Through grasping the operation principle of MCCB and the experiment, the state of MCCB after fire suppression is discriminated. The distinction possibility on the exist of electricity fire is proposed.

본 연구에서는 전력, 통신 등 다양한 주요 기간설비의 운영에 필수적인 전기판넬의 내진성능개선을 위하여 내진보강시스템을 개발하고, 이 시스템의 내진성능평가를 위하여 진동대시험을 수행하였다. 본 연구에서 개발된 전기판넬 내진보강시스템은 이중바닥시스템(Access floor) 상에 설치된 전기판넬을 대상으로 운전하에서 무정전, 무이설 방식으로 내진보강이 가능하다는 장점을 지니고 있다. 진동대시험을 통해 전기판넬 내진보강시스템의 성능평가를 위하여 지진하중으로서 건물 내 여러 층에 설치되는 전기판넬의 특성을 고려하여 포괄응답스펙트럼을 입력하였다. 진동대시험은 널리 상용화되어 있는 스틸과 우드판넬 등 두 형식의 이중바닥시스템과 일반 전기판넬을 대표할 수 있는 동특성이 다른 두 종류의 전기판넬을 고려하여 총 4회 수행하였다. 진동대시험결과, 내진보강시스템은 진동대시험 중 및 후에도 전도 등으로 인한 전기판넬의 파손을 방지하는 등 전기판넬의 내진안전성을 확보하여 주는 것으로 나타났다. 따라서, 이중바닥시스템 상에 설치된 전기판넬에 개발된 내진보강시스템을 적용하는 경우, 지진으로 인한 전기판넬의 파손을 효과적으로 방지하여, 국내 주요 기간설비의 안정적 운영에 크게 기여할 수 있을 것으로 판단된다.

This study set three kinds of situation and observed the various states such as carbonization by experimenting damages by fire of electric iron. The results of this study are as follows: The fire did not occurred when the unpowered iron over mattress and cotton shirts was com busted completely by external flame because the temperature of surface of soleplate and mattress did not reach the minimum ignition energy and when the powered electric iron over mattress and cotton shirts was left for an hour with its temperature dial set to high because the temperature of combustibles did not reach the minimum ignition energy. The fire occurred when the electric iron in which the outer box, bi-metal switch, and temperature fuse were removed over mattress and cotton shirts was powered by through heater terminal, and then the electric iron, mattress, and cotton shirts were combusted by the fallen combustibles because the temperature of combustibles reached to the minimum ignition energy with the help of active transfer of heat.