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Automatic ARIMA modeling for PVC products demand forecasting
강수길,강민구,이호경,박선원 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
The scheduling for efficient results in PVC plant should be determined based on the productsdemand which had been correctly forecasted by reasonable methods. However, because most existing forecasting packages need user``s knowledge about forecasting, it has been hard for engineers without forecasting knowledge to apply forecasted demand to scheduling. So, this article describes the method of Automatic ARIMA modeling adopted in the forecasting software developed for plant engineers without user``s forecasting knowledge. In this study, objective criteria of several stages in Box and Jenkins process are proposed for Automatic ARIMA modeling of PVC demandforecasting. Stages of the process are specification, estimation, diagnostic checking and forecasting. Though the criteria are based on existing probability values, such as autocorrelation function, Tratio, Akaike``s information criterion, Schwarz``s Bayesian criterion, the values are specified by PVC demand properties for automatic forecasting software. And the forecasting ability of the developed is evaluated using the past data.
A-54 : Short-term demand forecasting for Polyvinyl Chloride process scheduling
강수길,강민구,이호경,박선원 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
The scheduling of plant should be determined based on the product demands correctly forecasted by reasonable methods. However, because most existing forecasting packages need user`s knowledge about forecasting, it has been hard for plant engineers without forecasting knowledge to apply forecasted demands to scheduling. Therefore, a forecasting module has been developed for plant engineers without forecasting knowledge. In this study, for the development of the forecasting module, an automatic method using the ARIMA model that is framed from modified Box-Jenkins process is proposed. And a new method for safety inventory determination is proposed to reduce the penalty cost by forecasting errors. Finally, using the two proposed methods, the automatic module has been developed. Acknowledgement: This work was supported by the IMT2000(project number: 00015993)0 in 2003 and Center for Ultramicrochemical Process Systems sponsored by KOSEF
$Cr^{6+}$가 흰쥐 신장세포내 미토콘드리아의 호흡에 미치는 영향과 저분자 크롬결합물질의 작용
강수길,부문종,최임순,Kang, Soo-Gil,Boo, Moon-Jong,Choe, Rim-Soon 한국현미경학회 1989 Applied microscopy Vol.19 No.2
To investigate the effects of hexavalent chromium on mitochondrial respiration of rat kidney, various hexavalent chromium concentrations were treated, then respiration and electron transfer enzyme activities were measured. Ultrastructural changes at state IV respiration of mitochondria were also observed. Then, to investigate protective role against hexavalent chromium in the body, low-molecular-weight, chromium-binding substances (LMCr) were purified from livers of rabbits 2hr after intravenously administrated with sodium dichromate at a dose of 74mg per kg body weight. And then, respiration rates of mitochondria treated with LMCr, hexavalent chromium containing 0.7mM chromium were measured. Hexavalent chromium decreased state IV respiration rates and electron transfer enzyme activities of mitochondria, and increased labile membrane and swelling. And partial inhibitions of condensed to orthodox conformational change were observed. Respiration rates of mitochondria treated with LMCr containing 0.7mM chromium did not differ from that of the non-treated mitochondria. But respiration rates of 0.7mM hexavalent chromium-treated mitochondria decreased by 42%, compared to non-treated mitochondria. These results suggest that LMCr may play an important role in detoxification of toxic hexavalent chromium.
강수길,C. M. Rouleau 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.2
Titanium nitride (TiN) thin films were grown epitaxially on Si (111) substrates by reactive pulsed laser deposition. Substrate temperatures ranged from 550 to 950 C while plume kinetic energies ranged from 46 to 154 eV. Quality of the grown films depended strongly on kinetic energy of the films than the growth temperatures. High quality film was grown at 750 C with a laser plume kinetic energy of 92 eV. Full width at half maximum for a !-scan around the TiN (111) peak and a '-scan through the TiN (002) peak were 0.3 and 0.43, respectively. The resistivity of the films was increased with increased temperatures and a room temperature resistivity of 3.8 μ -cm was obtained.