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金映伸 충남대학교 자연과학연구소 1982 忠南科學硏究誌 Vol.9 No.1
The purpose of this study is to investigate home managers' behaviors of MFA(Mutual Financing Association) in relation to home manager's age, education and socio-economic status. The sample consisted of 121 home managers living in Daejon in 1982. X^2 was used to analyzed to the data. The major findings were ; First, home managers would have relatively affirmative attitude to the MFA. Second, among the management behavior of MFA home managers should pay more attention to research, checking, and evaluating. The finding indicated that home manager's education, socio-economic status positively related to research and checking and that home manager's age was not significant variable in management behavior.
Harmonic Generator의 저주파 혼변조 신호 성분을 이용한 전치왜곡 선형화기 설계
金英,장익수,張亨淳 대한전자공학회 2002 電子工學會論文誌-TC (Telecommunications) Vol.39 No.9
본 논문에서 제시한 새로운 형태의 전치왜곡 회로는 Harmonic Generator에서 발생되는 저주파 혼변조 신호 성분만을 추출하여, 이것을 Vector Modulator에서 원 신호와 진폭 변조시키는 것이다. 이러한 회로를 이용하여 3차, 5차 혼변조 신호를 발생시켜 전력 증폭기의 혼변조 신호를 감쇠시키는 선형화기를 구현하였다. 구현된 전치왜곡 선형화기는 국내 개인 휴대 통신(PCS) 기지국 송신 대역인 1840MHz ~ 1870MHz주파수에서 동작되도록 제작, 측정을 하였다. 그 결과 반송파 2-tone 신호를 인가할 때 3차 혼변조 왜곡 특성은20dB 이상, 5차 혼변조 왜곡 특성은 10dB 이상의 개선효과를 얻었고, IS-95 CDMA 신호를 인가하였을 때 인접채널 전력 비를 10dB이상 개선시켰다. In this paper, a new type predistorter using a low frequency intermodulation signals terms of harmonic generator is proposed. A vector modulator, in which fundamental signal is modulated with low frequency intermodulation signals derived from harmonic generator, generates predistorted third and fifth IM components. Using predistorted signals, intermodulation distortion signals of power amplifier suppressed. The suggested predistorter has been manufactured to operate in Korean PCS base-station transmitting band (1840~1870MHz). The test results show that the third IMD signal level is reduced more than 20dB and the fifth IMD signal is reduced about 10dB for CW two-tone signals. The predistorter improves the Adjacent Channel Power Ratio (ACPR) more than 10dB for CDMA (IS-95) signals.
잉여 대역폭 소비 큐를 이용한 계층적 잉여 대역폭 페어 큐잉
金永翰,秋皓喆 대한전자공학회 2003 電子工學會論文誌-TC (Telecommunications) Vol.40 No.12
Scheduling technology is one of the most important elements required to support the Quality of service (QoS) in the Internet and a lot of scheduling algorithms have been developed. However, most of these algorithms are not flexible to distribute the excess bandwidth. In order to provide flexibility for distributing the excess bandwidth, we proposed excess bandwidth fair queueing (EBFQ) algorithm with relatively low complexity[1]. In this paper, we propose the new extension to this EBFQ algorithm for the hierarchical fair queueing system. This extension can be naturally applied to the existing hierarchical algorithm and simultaneously provide the same level of fairness. Through the simulation and analysis, we verify it. 인터넷에서 서비스 품질을 제공하기 위해 대역폭에 대한 스케쥴링 기술은 중요한 요소 중 하나로서 많은 알고리즘이 개발되었다. 그러나 기존의 스케쥴링 알고리즘은 잉여 대역폭 분배에 있어 융통성을 제공하고 있지 않다. 이를 보완하여 잉여 대역폭 분배에 융통성을 제공하기 위해 구현의 복잡도를 감소시킨 EBFQ (excess bandwidth fair queueing) 알고리즘을 제안하였다[1]. 본 논문에서는 이를 확장하여 계층적 페어 큐잉 시스템에 적용한 알고리즘을 제안하였다. 제안된 알고리즘은 기존의 임의의 계층적 기반 알고리즘에 자연스럽게 적용할 수 있으며 동일한 공평성 등의 특성을 갖는다. 이러한 특성을 분석 및 시뮬레이션을 통해 검증하였다.
Acetaldehyde폐수의 활성오이법에 의한 기질제거조건
금영일,금두조 대한환경위생공학회 1993 대한환경위생공학회지 Vol.8 No.1
This study is conducted to investigate treatability by activated sludge process for wastewater from acetaldehyde manufacturing plant. The optimum hydraulic retention time in aeration tank for removal of high strength substrate were measured. The removal efficiency were checked out by hydraulic retention time : 35hr., 40hr. and 45hr., respectively. $COD_{Cr}$, like substances were removed in all hydraulic retention time zone directed for efficiency, but non-biodegradable substances were remained. $COD_{Cr}$ biomass loading was 0.81kg $COD_{Cr}/kgMLVSS$ . day at 35hr. of retention time, 0.34 kg$COD_{Cr}$/kg MLVSS . day at 40hr., and O.l9kg$COD_Cr$/kgMLVSS . day at 45hr. And the mean $COD_{Cr}$, removal efficiency was 65.5%, 81.6% and 83.0%, respectively. And also $COD_{Cr}$, volume loading was 1.01kg$COD_{Cr}/m^3$ day, 0.87kg$COD_{Cr}/m^3$ - day, and 0.79kg$COD_{Cr}/m^3{\cdot }$day, respectively. The basic design parameter obtained is as fallows. The value of Specific substrate removal rate coefficient (k), Yield coefficient(Y) and Decay coefficient($k_d$) was $0.0013day^{-1}$, $0.505kgMLVSS/kgCOD_{Cr}$ and $0.040day^{-1}$, respectively.