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확률제어 기법을 이용한 불규칙 진동계의 모델추종 이중제어기 설계
이종복(Lee, J. B.),김흥윤(Kim, H. Y.),안준영(Ahn, J. Y.),허훈(Heo, H.) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.6
Much of the study has been done on the design of dual controller that guarantee the stability and improvement of the system performance. A dual controller concept is proposed to consist of first controller estimates the control law and second controller suppresses the combined noises due to numerical error and internal noise as well. These Irregular disturbances are not only increasing the fatigue but also destabilize the system because of unwanted output Performance. The 'stochastic controller' is used to suppress the irregular random disturbance. Simulation is conducted to reveal that the proposed dual stochastic controller is highly efficient one to control a system hybrid noises.
2001년 11월 오염시기와 2002년 봄 황사시기 제주도 고산에서의 미량원소 농도 변화
한진석,김영성,문광주,안준영,김정은,류성윤,김영준,공부주,이석조 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.2
The chemical composition of PM_(2.5) was measured at Gosan. Jeju for two weeks each in November 2001 and spring 2002. In the latter part of the measurement period of November 2001, designated as the polluted period in this work, secondarily formed ion components as well as primarily emitted elemental carbon were high, PM_(2.5) mass concentration was also high in this polluted period compared with the yellow sand period, in which daily average of PM_(10) peaked up to 520㎍/㎥. Increase of major components of anthropogenic origin in the polluted period was not correlated with the variation in sea salt components while increase of crustal components in the yellow sand period was highly correlated with the variation in sea salt components. Trace elements were generally higher in the yellow sand period: however, toxic heavy metals such as zinc, cadmium and lead were the highest in the polluted period.
한진석,문광주,류성윤,안준영,공부주,홍유덕,김영준 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.4
Size-segregated measurements of aerosol composition using X-stage DRUM impactor are used to determine the transport of natural and anthropogenic aerosols at Gosan site from 29 March to 30 May in 2002. Separation of ambient aerosols by DRUM impactor offers many advantages over other standard filtration techniques. Some of the most important advantages are the ability to segregate into details by particle size, to better preserve chemical integrity since the air stream doesn't pass through the deposit, to collect samples as a function of time, and to have a wide variety of impaction surfaces available to match analytical needs. Although the transport of Yellow sand is a well-known phenomenon in springtime, the result of measurement shows that not only soil dust but also anthropogenic aerosols, including sulfur, enriched trace metals such as Pb, Ni, Zn, Cu, Cr, As, Se, Hr, are transported to Gosan in springtime. This study combines the size- and time- resolved aerosol composition measurements with isentropic, backward air-mass trajectories in order to identify some potential source regions of anthropogenic aerosols. As a result, during the NYS period, the average concentration of PM_(10) was 46 ㎍/㎥. Si, Al, S, Fe, Cl, K, Ca were higher than 1,000 ㎍/㎥ and Ti was about 100 ㎍/㎥. The concentrations of Zn, Mn, Cu, Pb, Br, Rb, V, Cr, Ni, As, Se ranged between 1 and 70 ㎍/㎥. More than 50% of typical soil elements, such as Al, Si, Fe, Ca, Ti, Cr, Cu, Br, were distributed in a coarse particle range (5.0 ∼ 12μm). In other hand, anthropogenic pollutants, such as S, N, Vi, were mainly distributed in a fine particle range (0.09 ∼ 0.56μm). During the YS period, PM_(10) increased about 8 times than NYS period, and main soil elements, such as Al, Si, S, K, V, Mn, Fe also doubled in coarse particle range (1.15 ∼ 12μm). But Zn, As, Pb, Cu and Se, which distributed in the fine aerosols (0.09 ∼0.56μm), were on the same level with or decreased than NYS period. Finally, except the YS period, coarse particles (2.5 ∼ 12μm) arc inferred to be influenced by soil, coal combustion, waste incineration, ferrous and nonferrous sources through similar pathways with Yellow Sand. But line particles have different sources, such as coal combustion, gasoline vehicle, biomass burning, oil or coal combustion, nonferrous and ferrous metal sources, which are transported from China, Korea peninsula and local sources.