To evaluate the color change of the dyed materials by ultraviolet and visible rays in the museum, a system that accelerates dye fading was developed. Radiation energy from a Xenon lamp is irradiated on the samples through the filters of defferent cut-on wavelengths. As a result, the color change as a function of the wavelength and irradiation is calculated.

This paper describes ozone concenteration(O3con) and ozone generation(O3g) of lamp type ozo-nizer(O-Lamp)which be performed a role of lighting source and ozonizer. O=Lamp is consist of two low pressure mercury lamps. The important conclus-ions obtained from this paper are as follows, The more quality of supplied gas(Q) decrease, the higher O3con rise, The more quality of supplied gas(Q) increase, the higher O3g some rise. The Escherichia coli is reacted on ozone can be sterilized above 99[%]. Also, O-Lamp can confirmed possibility of appli-cation as lighting-source.

LCD. projector back light용 metal halide lamp는 최근 LCD의 고신장세에 편승 매년 30% 정도 수요가 증가하고있는 첨단제품으로 국내에서는 전량 수입에 의존하고 있는 실정이며 본 연구에서는 다음과 같은 기술 성과를 거두었다. 1. LCD projector back light용 150W metal halide lamp및 전자식 안정기의 국산화 완료 2. 초소형 metal halide lamp의 설계기술 및 제작 기반기술 확보 3. Metal halide lamp용 전자식 안정기의 설계기술 확보

This paper presents a new approach in the design of an electronic ballast for fluorescent lamps in the range of 10∼20W. The central point of the design lies in the equivalent concepts for a lamp and for the inverter part of an electronic ballast. The ballast, which adopts half-bridge inverter topology, is designed to adjust ifself to a predefined range of lamp power output by frequency control using MCU. At first, the circuit parameters were estimated using PSpice simulatio, and then were made varied according to the selection of an optimal frequency for each lamp. A series of experiments using fluorescent lamps of 11W, 15W, and 20W were carried out to verify the proposed design. As a result of the experiments, all the three lamps of different kind were run normally with the same ballast under consideration, And the characteristics on lamp starting and light output were satisfactory compared to existen single-output electronic ballasts.

The accurcy and the application limits of the Three-Curve Method(TCM) and Zonal Cavity Method(ZCM) are evaluated. Average illuminance values are calculated by TCM and ZCM for various lighting conditions using general Diffusing Luminaires and Direct Luminaires. These values are compared with the values from Monte-Carlo Simulation(MCS) for the same lighting conditions. Accuracy of MCS was proved by Moon's Analytical Method.

반도체 1장을 가공하는데 약 300개 공정에 3개월이 소요되며, 반도체 3사의 95년도 순이익은 2조5천억 원에 달할 것으로 전망된다. 이렇게 엄청난 부가가치 때문에 업계뿐 아니라 국가적으로 심혈을 기울이고 있으나 가공기술과 물량에서 선진국일 뿐 반도체를 가공할 수 있는 장비는 전량 외산에 의존하고 있다. 이러한 현상은 미국이나 일본 등 반도체 분야 선진국들과의 경쟁에서 뒤쳐질 수밖에 없는 구조적인 단점을 가지고 있다. 이를 극복하기 위해서 반도체 제조 장비의 국산화가 시급하며 그중 하나인 Chamber 내에서 Plasma를 발생시키고 자동 접할수 있는 시스템을 설계하고 제작코자 한다.

전기재해(전기재해)라 함은 전력 계통의 이상이나 또는 전기 설비의 누전과 합선 및 과부하나 스파크 등에 의해서 전기 화재를 유발시키거나 전기기기에 이상을 주는 것을 말한다. 그러나 전기재해의 징후를 검출할 수 있다면 최근 들어 계속 늘어만 가는 전기재해의 피해를 줄일 수 있다. 본 논문에서는 전기재해 징후로서의 스파크 현상 검출과 이와 유사한 현상을 보이는 정상 부하의 동작 현상을 비교하고 구분하는 법을 제시하고 있다. 이를 바탕으로 스파크를 수반하는 전기화재의 조기 검출 알고리즘을 소개하였다.

ABSTRACT - This paper presents a software based 3 phase 5 level pulse-width modulation(PWM) inverter to reduce total harmonic distortion. The proposed modulation technique can reduce total harmonic distortion and significantly improve the performance of the inverter. In the modulation mode where the frequency ratio is 36 and modulation index is 1.2∼2.0, harmonic components have been mostly eliminated and the magnitude of fundamental component have been maximized by the 3 phase 5 level PWM inverter.

This paper describes a diagnosis of transformer by ultrasonic signal due to partial discharge. The ultrasonic signal can be measured when partial discharge is generated in a real transformer. The trend of partial discharge in transformer was estimated by counting the number of ultrasonic signals until insulation paper in the point-to-plane electrode is destroyed. The number of ultrasonic signals is closely related to the number of the electrical signals by partial discharge. The trend of the ultrasonic signal number could easily be distinguished by taking moving average.

In this paper an induction motor control using fuzzy controller and neural network adptive observer is studied. The proposed observer which comprises neural network flux observer which comprises neural network flux observer and neural network torque observer is trained to learn the flux dynamics and torque dynamics and subjected to further on-line training by means of a backpropagation algorithem. Therefore it has been shown that the robust control of induction motor neglects the rotor time constant variations

The linear control of DC Link voltage in PWM inverter is very importent to estimate the goodness of PWM method. In motor control system, for the maximum torque on full region operating, the whole of DC Link voltage region must be used. 3 phase sinusoidal PWM inverter has a low efficienty at the using of output voltage. according to make better the efficiency, new improved PWM control method is proposed. The results of experimentation and simulation are included to verify the validity of this method.

In this paper, we persents a new PAM method without the input transformer for reducing harmonics in input AC line currents of converter. This system can reduce the harmonics like conventional 12-pulse converter. the dual bridge circuits are controlled with the shifted firing angle and connected 2 tap interphase reactor. the input current using 2 tap changing on interphase reactor is controlled with the different two values in order to make the input current waveform 12 pulses. The chracteristics of this system were confirmed through the computer simulation and the experiments.

Subscriber-Unit(SU) method in apartment-housing is used as the plan for the Cable-TV(CATV) receiving facility. But it is decided to apply Notification NO.1994-18 of the Ministry of Communications regulations starting in march, 10.1994. In this study, a new plan of CATV-receiving facility according to the Notification NO.1994-18 is suggested, and it is designed to apply lone-wire from an amplifier box to a SU or another amplifier box. Proposed results adopt the Head End(HE) to introduc Integrated Service Digital Network(ISDN) and to raise added-value of apartment-housing.

This paper describes the O.T aging analysis by non-destructive electrical and UV/visible method. Non-destructive diagnosis method is tan8 test. Also the new method of the aging analysis, UV/visible method was introduced in this paper and compared with the non-destructive electrical method. The UV/visible test could be useful method for the O.T aging electrical diagnosis such as non-destructive electrical method.