• Nuclear Engineering and Technology
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• 제40권4호
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• pp.299-304
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• 2008

A detection system was set up to measure the neutron generation rate of a recently developed D-D neutron generator. The system is composed of a Si detector, He-3 detector, and electronics for pulse height analysis. The neutron generation rate was measured by counting protons using the Si detector, and the data was crosschecked by counting neutrons with the He-3 detector. The efficiencies of the Si and He-3 detectors were calibrated independently by using a standard alpha particle source $^{241}Am$ and a bare isotopic neutron source $^{252}Cf$, respectively. The effect of the cross-sectional difference between the D(d,p)T and $D(d,n)^3He$ reactions was evaluated for the case of a thick target. The neutron generation rate was theoretically corrected for the anisotropic emission of protons and neutrons in the D-D reactions. The attenuations of neutron on the path to the He-3 detector by the target assembly and vacuum flange of the neutron generator were considered by the Monte Carlo method using the MCNP 4C2 code. As a result, the neutron generation rate based on the Si detector measurement was determined with a relative uncertainty of ${\pm}5%$, and the two rates measured by both detectors corroborated within 20%.

• KIEE International Transactions on Power Engineering
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• 제4A권3호
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• pp.122-128
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• 2004

With the advent of distributed generation, power systems are fundamentally impacted in regards to stability and power quality. Distributed generation has a positive impact on system restoration following a fault, higher reliability, and mitigation of effect due to voltage sag. However, distributed generation also has a negative impact on decrease of reliability such as changes of protective device setting and mal-operation. Because bulk power systems consist of various sources and loads, it becomes complicated to analyze a power system with distributed generation. The types of distributed generation are usually classified by both rotating machinery and the inverter-based system. In this paper, distributed generation is designed by rotating machinery, and the distributed system having a model of the distributed generation is simulated using EMTP. In addition, this paper presents the simulation results according to the types of distributed generation.

• 가정과삶의질연구
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• 제14권2호
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• pp.97-110
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• 1996

The purpose of this study was to compare the caregiver burden and rewards in new generation and middle-aged couples. Data were collected from 207 new generation couples and 196 middle-aged couples who had either of older parents and lived in Seoul. Major findings are as fallows; 1. The burden were constituted with restriction of privacy physical burden strain psychological burden economic cost and guilt. The rewards were constituted with recognition pride maturity improving relationship and assistance of household and childcare. 2. The caregiver burden of new generation and middle-aged wives were hgiher than husbands. Hwever the caregiver rewards of new generation and middle-aged husbands were higher than wives. 3. The caregiver burden of middle-aged husbands were higher than new generation husbands bur there was no significant difference between new generation and middle-aged wives. 4. The caregiver rewards of middle-aged wives were higher than new generation wives but there was no significant difference between new generation and middle-aged husbands.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.435-438
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• 2008

The huge economical damage and environmental pollution have been occurred for decades because of using of fossil fuel. So the development of alternative energy is urgent. In the west sea of Korea, a proper area for tidal power plant, development and investigation for economical efficient of tidal power plant are preceeding. The water turbine generator with the capacity of 25.4MW was used to compare single-basin flood tide generation with ebb tide generation while considering the water depth and tide in the vicinity of Sukmodo.

• KEPCO Journal on Electric Power and Energy
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• 제6권4호
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• pp.433-438
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• 2020

Accurate forecasting of wind power is important for grid operation. Wind power has intermittent and nonlinear characteristics, which increases the uncertainty in wind power generation. In order to accurately predict wind power generation with high uncertainty, it is necessary to analyze the factors affecting wind power generation. In this paper, 6 factors out of 11 are selected for more accurate wind power generation forecast. These are wind speed, sine value of wind direction, cosine value of wind direction, local pressure, ground temperature, and history data of wind power generated.

• 전기학회논문지
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• 제64권4호
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• pp.505-514
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• 2015

This paper proposes a probabilistic generation assessment model of renewable energy generators(REGs) considering uncertainty of resources, mainly focused on Wind Turbine Generator(WTG) and Solar Cell Generator(SCG) which are dispersed widely in South Korea The proposed numerical analysis method assesses the one day-ahead generation by combining equivalent generation characteristics function and probabilistic distribution function of wind speed(WS) and solar radiation(SR) resources. The equivalent generation functions(EGFs) of the wind and solar farms are established by grouping a lot of the farms appropriately centered on Weather Measurement Station(WMS). First, the EGFs are assessed by using regression analysis method based on typical least square method from the recorded actual generation data and historical resources(WS and SR). Second, the generation of the REGs is assessed by adding the one day-ahead resources forecast, announced by WMS, to the EGFs which are formulated as third order degree polynomials using the regression analysis. Third, a Renewable Energy Generation Assessment System(REGAS) including D/B of recorded actual generation data and historical resources is developed using the model and algorithm predicting one day-ahead power output of renewable energy generators.

• 한국환경과학회지
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• 제20권7호
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• pp.891-898
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• 2011

The aim of this research was to evaluate the effect of combination of disinfection process (electrolysis, UV process) on Escherichia coli (E. coli) disinfection and oxidants (OH radical, $ClO_2$, HOCl, $H_2O_2$ and $O_3$) generation. The effect of electrolyte type (NaCl, KCl and $Na_2SO_4$) on the E. coli disinfection and oxidants generation were evaluated. The experimental results showed that performance of E. coli disinfection of electrolysis and UV single process was similar. Combination of electrolysis and UV process enhanced the E. coli disinfection and 4-carboxybenzaldehyde (4-CBA, indicator of the generation of OH radical) degradation. It is clearly showed synergy effect on disinfection and OH radical formation. However chlorine ($ClO_2$, HOCl) and oxygen type ($H_2O_2$, $O_3$) oxidants were decreased with the combination of two process. In electrolysis + UV complex process, electro-generated $H_2O_2$ and $O_3$ were reacted with UV light of UV-C lamp and increased 4-CBA degradation(increase OH radical). Disinfection of electrolyte of chlorine type was higher than that of the sulfate type electrolyte due to the higher generation of OH radical and oxidants.

• 한국정밀공학회지
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• 제15권3호
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• pp.38-49
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• 1998

The 3rd generation optical pick-up used popularly in resent years is composed of many optical and electronic components such as laser diode, photo diode, beam splitter, objective lens, grating lens, concave lens, collimator lens etc. Therefore, the design of its optical system and its main base which the said optical and electronic components are set on, is complicated and needs high precision. Its assembly and adjustment in the production line is also difficult. This complication and the demand of high precision get its production cost to be high and its reliability to be low. In this paper, the 4th generation optical pick-up is designed and developed, with the hologram device which laser diode. photo diode, beam splitter. and grating lens are integrated in. This optical pick-up reduces the number of points of adjustment by 3, compared with the 3rd generation optical pick-up of which the number of points of adjustment is 6. This optical pickup also decreases by 4 the number of points of W bonding to have bad influence on environmental reliability, decreases by about 10 the number of parts, and establishes about 20% cost-down of material cost, compared with the 3rd generation optical pick-up.

• 한국정보전자통신기술학회논문지
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• 제4권4호
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• pp.258-263
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• 2011

본 논문에서는 추적식 태양광 발전 시스템을 위한 고품위 축전지 충방전 컨트롤러를 설계하였다. 제안하는 컨트롤러는 태양광 발전시스템에 일반적으로 사용하는 납산축전지(연축전지)뿐만 아니라 향후 개발되어 신 재생에너지 발전 시스템에 사용될 다양한 배터리를 충전하는데 적합하도록 미세 전류조절기능을 갖춘 새로운 기능을 갖는 컨트롤러이다. 사용자 편의성을 높이기 위하여 LCD 표시기의 기능을 보강하였으며 CAD를 이용한 최적설계를 통하여 대기 전력의 최소화를 구현하였다.

• 한국생활과학회지
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• 제4권1호
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• pp.13-29
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• 1995

The purposes of this study are to investigate the characteristics of recognitions and attitudes of new generation family on the family life, and to help the family members of the new generation family to be able to adapt to the future family and society with the right senses and attitudes on the family life. Three-hundred married men and women who were less than 35 years old, and who continued marriage for less than five years were selected. The results of this study were as follow; 1) Types of family composition was mostly nuclear family, and got help from their parents in managing household work. 2) Most new generation family was more likely to share equal roles and rights in household affairs, decision making and ownership of real properties. 3) Most new generation family considered the personality and the sense of value as the most important conditions which their spouse must have. And they were affirmative to wives' employment. 4) Most new generation family wanted 2 children. And preferred showed that they did not care much about son preference. 5) Most new generation family showed strong sense of responsibility for taking care of their old parents. However, they showed independency of financial planning for later years. 6) In many ways of life, their recognitions and attitudes were progressive but their were conservative in practical life as the older generations did.