Ga 함량에 따른 Cu(In<SUB>x</SUB>Ga<SUB>1-x</SUB>)Se₂ 태양전지의 특성분석

김석기(Seok Ki Kim),권세한(Se Han Kwon),이두열(Doo Yeol Lee),이정철(Jeong Churl Lee),강기환(Ki Whan Kang),윤경훈(Kyung Hoon Yoon),안병태(Byung Tae Ahn),송진수(Jinsoo Song) 대한전기학회 1998 대한전기학회 학술대회 논문집 Vol.1998 No.7

산업부산물인 Fly Ash의 라이닝콘크리트에의 적용에 관한 실험적 연구

최세진,임정열,정우성,김완영,김무한 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1

This is an experimental study to analyze the usability of fly ash in the tunnel lining concrete. For this purpose, the mix proportion of plain concrete and concrete using fly ash(the replacement of 15 and 30% by weight of cement) to satisfy slump 15cm, air content 5% and compressive strength 270kgf/cm2, was selected. And then tests for slump, setting time, compressive strength, tensile strength, drying shrinkage and adiabatic temperature rise were performed. According to test results, it was found that the concrete using fly ash 15% (FA 15 concrete) was better than the plain concrete and FA 30 concrete. FA 15 concrete was more useful than the others in reducing the drying shrinkage : the drying shrinkage strains of FA 15 concrete after 20 weeks of air drying was lower about 10% than the plain concrete, and lower 6% than FA 30 concrete. And the highest compressive strength after curing for 28 days of 365kgf/cm2 was obtained from FA 15 concrete. This was almost 10-20% improvement in compressive sterngth, compare to the plain concrete and FA 30 concrete. And the effect of 5~7.5℃ of concrete using fly ash for hydration heat reducing was calculated. Therefore, concrete using fly ash 15% (FA 15) was expected to improve the performance of lining concrete.

이동체에 적합한 소형 무선 데이터 송·수신기 설계 및 제작

김세열,정천석 울산대학교 2001 공학연구논문집 Vol.32 No.1

이동체에 적합한 소형 무선 데이터 송수신기를 설계하여 그 특성을 시험하였다. 본 논문에서는 Binary FSK-NRZ로 변조된 소형의 송수신기를 사용하여 원격측정 시스템의 이상상태를 데이터화시켜 전파로 송출 함으로써, 이동 상태에서 시스템의 상태를 실시간 모니터링 할 수 있도록 하였다. 송신기 출력은 10mW로써 약 300∼500meter로 측정되었다. A small wireless transceiver has been designed and its characteristics is investigated. In this paper, we uses the transceiver whose modulated signal format is the binary FSK-NRE line code, and the telemetering system using the transceiver is monitored in real time by checking the radiated data of its extraordinary phenomena, as even though it is mobile. It shows that the output power of transmitter is about 10mW, and can transmit data up to 300∼500 meter.

韓國企業의 LOGO TYPE 活動에 對한 硏究 : CORPORATE IDENTITY PROGRAM의 活成化 方案을 前提로

吳世烈 圓光大學校大學院 1982 學位論叢 Vol.8-3 No.-

This thesis indicates that there are a study of the devices in which the images of an industry and its products can be properly implanted in the consumers' minds in this seriously complicated society at the present day, specially the history and the present condition of the logo tyoe activities in Korean industries on the assumption of the operation of CIP, the examples in forein industries, and the prospects and the problems of its operation in future. In accordance with CIP of Korean industries for the enforcement of logo type, I assume their top manager should know the following. 1. They must have a correct understanding of logo type by means of CIP. 2. In the fulfilment of logo type, the thorugh investigations should be sufficiently taken into the industries and their products before the operation. 3. If CIP system were applied and fufilled unitedly in the operation of logos type, the images of an industry and its products would be fixed in the consumerers' minds.

성격의 변화를 수반한 Wilson씨병 1례

유세종,이상렬,박민철 圓光大學校 醫科大學 神經精神科學敎室 1994 圓光精神醫學 Vol.10 No.2

We had a 22 year old male patient with Wilson's disease showing neuropsychiatric symptoms. He showed neuropsychiatric symptoms such as personality change, regressed and childish behavior, wing-beating tremor and rigidity on the upper extrmity, open mouth, drooling, bradykinesia, dysarthria and dysphagia. In brain MRI findings, bilateral high signal intensity on T2WIs were observed in basal ganglia, thalamus, central midbrain and periaqueductal pons. In liver scan, splenomegaly was detected. At a slit-lamp examination, we detected the brownish colored pigments(Kayser-Fleisher ring) on Descement's membrain of both eye corneas. Laboratory findings were a low serum ceruloplasmin(2.63㎎/dl, normal: 25~45㎎/dl), low serum copper level(32㎍/dl, normal: 80~130㎍/dl), and an increased 24 hous urine-copper excretion level(258㎍/day, normal: 15~30㎍/day). Therefore, we diagnose the patient as having wilson's disease and we started medication treatment with penicillamine.

CASE를 이용한 프로젝트 개발 : Excelerator를 중심으로 With Focus on Excelerator

김세열,이종혁,전용배 경성대학교 생산기술연구소 1996 생산기술연구지 Vol.3 No.-

Former method of software manufacture got to be incongruous and got to have many difficulty in maintaining & repairing as the tendancy of project enlargement and the more and more complex demand. So, in this thesis, we research project development method through CASE to solve above problems. We treated the integrated schedule as the scope of project and used Excelerator that is an integrated set of analysis and design tools as CASE tool. By adapting methodology of CASE to the project, we could get results of understanding the project easily and saving much development time and doing error detection in adbance. So, we could be easier to implement the project using the Access 2.0 and Visual Basic 4.0.

GPS 위성수신용 마이크로스트립 패치 안테나의 설계 및 제작

김세열,정천석 울산대학교 1998 공학연구논문집 Vol.29 No.2

고유전율의 유전체 세라믹 기판을 사용하여 GPS(Global Positioning System) 위성수신용 단일 급전 원형편파 마이크로스트립 패치 안테나를 제작하여 시험하였다. 제작된 안테나는 작기 때문에 차량과 같은 이동체에 사용하기 적합하였다. 우선회 원형편파를 구현하기위해 정방형 패 치면의 모서리를 잘랐다. 급전 방식은 패치면의 50Ω지점에 동축 프로브로 하였고, 시뮬레이션 하여 1.57542GHz에서 공진되도록 설계하였다. 제작된 안테나의 반사손실은 -13.394dB이고, 공진 주파수는 설계 주파수보다 약간 높은 1.591GHz로 측정되었다. 따라서 이 안테나는 GPS 위성수신용으로 사용하기에 적합하였다. Single-feed circularly polarized microstip patch antenna for GPS Satellite Receiver was fabricated by using high permittivity dielectric ceramic substrate and tested. This miniature antenna is suitable to be used for mobile such as cars. By truncating the corners of squared patch, right hand circular polarization was realized. It was fed by coaxial probe on patch at 50Ω impedance, and was simulated to resonate at 1.57542GHz. The return loss of this antenna was -13.394dB, and resonant frequency was measured at 1.591GHz higher than desired frequency. Therefore, it could be used for GPS Satellite Receiver.

도시지역 지하수 오염취약성 평가방법의 적용성 연구

함세영,김무진,강래수,정재열,차용훈,장성 부산대학교 환경문제연구소 2003 環境硏究報 Vol.21 No.-

According to favorable water quality, groundwater is used as subsitutive water resources for surfare water. However, groundwater is contaminated more and more due to industrialization and population increase. This study assesses groundwater vulnerability to contaminants in 12 dongs (administrative districe) of Changwon city using with DRASTIC. DRASTIC was originally applied to the situations that contamination sources are on ground surface, and contaminants flow into groundwater with infiltration of rainfall. In addition to DRASTIC factors, groundwater contamination in urban area is also related with overpumping and with lowering of water level. Correlation coefficient between mumimum values of DRASTIC index and unfitness rate to drinking water quality for 10 dongs is low as 0.40. On the contrary, the correlation coefficient between minimum values of DRASTIC index and groundwater discharge rate and that between minimum values of DRASTIC index and well distribution density are 0.70 and 0.87, respectively. Thus, to evaluate the potential of groundwater contamination in urban areas, it is necessary to consider other factors such as groundwater abstraction rate and well density per unit area with ratings and weights as well as existing six DRASTIC factors.

보편적 서비스와 공통비 배분방식

염명배,최성열 충남대학교 경영경제연구소 2002 경영경제연구 Vol.25 No.1

오늘날 정보통신서비스 시장의 경쟁화는 전통적인 보편적 서비스의 유지에 큰 위협요인으로 작용하고 있다. 보편적 서비스 제공을 위한 원가산정(공통비 배분)과정에서 발생하는 사업자간 갈등을 최소화하면서 바람직한 수준의 보편적 서비스를 제공하기 위해서는 보편적 서비스의 범위 및 원가산정에 대한 논의가 구체화될 필요가 있을 것이다. 이에 본 연구는 최근 접속료 부문에서 국제적 관심대상으로 부각되고 있는 '장기증분원가(LRIC)' 산정모형을 보편적 서비스 원가 산정 규칙으로 채택하기 위한 타당성을 모색하고자 노력하였다. 이를 위해 외국 선진 통신사업자 및 규제기관의 제도개발 과정을 살펴봄으로써 LRIC의 도입에 따른 해법을 찾고자 하였다. 우리나라 정보통신 서비스 시장에 장기증분원가 방식을 도입할 경우 상당한 양의 데이터를 확보해야하는 Bottom up 방식보다는 역사원가를 고려한 Top-down 방식이 현실적으로 더 합당한 것으로 판단된다.

PSPICE Macromodeling에 의한 PLL의 주파수 특성연구

鄭天錫,朴明烈,金世烈,金洪九 울산대학교 1996 공학연구논문집 Vol.27 No.2

본 논문은 범용화되어있는 Microsim 사의 PSPICE를 이용해서 위상동기루프(PLL) Micromodeling으로 설계하여 시뮬레이션 하였다. PLL 회로는 위상검출기와 전압제어 발진기 그리고 루프 필터로 이루어져 있다. RC 저역통과 필터와 Butterworth 필터 그리고 Chebyshev 필터 등을 이용하여 입력주파수 변화에 따른 루프필터의 주파수 특성을 분석하였다. 그리고 전압제어 발진기의 자주발진주파수를 2.5kHz, 19kHz로 고정할 때의 주파수 스펙트럼을 분석하였다. 자주발진주파수 2.5kHz에서 Chebyshev 필터의 경우 upper lock range와 lower lock range는 똑같이 1,056Hz, 1,056Hz였고 upper capture range와 lower capture range는 536Hz, 540Hz였다. 또한 시뮬레이션 과정에서 삼각파를 구형파로 바꾸는 VCO의 슈미트 트리거단에서 수렴문제로 인하여 19KHz 이상에서는 상당히 긴 시뮬레이션 시간을 필요로 하는 단점이 있었다. 그렇지만 낮은 주파수대에서 주파수 특성 분석의 용이함과 정확성 및 복잡한 회로의 간략화에서 매크로모델링의 타당성을 보였다. With today's general simulator, PSPICE, a phase-locked loop(PLL), which consists of a phase detector(PD), a voltage-controlled oscillator(VCO), and a low-pass filter(LPF), is designed and simulated in macromodeling technique. By using a RC LPF, a Butterworth, and a Chebyshev LPF in turn, the frequency characteristics of the outputs according to the variations of the inputs are analyzed respectively. When 2.5KHz and 19KHz are selected as two specified free running frequencies in VCO block, the frequency spectrums of the outputs show that in case of the Chebyshev LPF at 2.5KHz, the upper and lower rock ranges have the same frequency ranges, 1056Hz, and the upper and lower capture ranges are 536Hz and 540Hz respectively. Furthermore, the simulation takes a long time especially above 19KHz, because of the convergence problem at schmitt trigger section, where the triangular wave is changed into the rectangular wave. However, this paper shows some validity that this macromodeling technique is one of the easy and accurate methods in analyzing the frequency characteristics, and useful in simplifying the complicated circuits at low frequency band below 19KHz.