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Nonlinear Model-based Dissolved Oxygen Control in a Biological Wastewater Treatment Process
유창규,이종민,이인범 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.1
The dissolved oxygen (DO) concentration has been an important process parameter in the biological wastewater treatment process (WWTP). In this paper, we propose a nonlinear control scheme to maintain the dissolved oxygen level of an activated sludge system. Without any linearization or model reduction, it can directly incorporate the nonlinear DO process model with on-line estimation of the respiration rate (R) and the oxygen transfer rate (KLa). Simulation results show that it outperforms a control performance of the PID controller. Since it incorporates the process disturbance and nonlinearity in the controller design, the suggested method can efficiently deal with the operating condition changes that occur frequently in the wastewater treatment process.
Data-driven prediction model of indoor air quality in an underground space
유창규,Min Han Kim,Yong Su Kim,JungJin Lim,Jeong Tai Kim,성수환 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
Several data-driven prediction methods based on multiple linear regression (MLR), neural network (NN),and recurrent neural network (RNN) for the indoor air quality in a subway station are developed and compared. The RNN model can predict the air pollutant concentrations at a platform of a subway station by adding the previous temporal information of the pollutants on yesterday to the model. To optimize the prediction model, the variable importance in the projection (VIP) of the partial least squares (PLS) is used to select key input variables as a preprocessing step. The prediction models are applied to a real indoor air quality dataset from telemonitoring systems data (TMS), which exhibits some nonlinear dynamic behaviors show that the selected key variables have strong influence on the prediction performances of the models. It demonstrates that the RNN model has the ability to model the nonlinear and dynamic system, and the predicted result of the RNN model gives better modeling performance and higher interpretability than other data-driven prediction models.
유창규 순천대학교 남도문화연구소 2011 南道文化硏究 Vol.0 No.21
After the event-Byeongja-Horan, the king Injo went all the way to Namhan-sanseong(Namhan mountain fortress) and gave message to the troops of Honam, southern region of the Korea. Since then, the Uibyeong(volunteer troops) started the actions, legitimately. It has confirmed that the troop of Honam was almost organized at the time of Byeongja-Horan(the Ching's Invasion in 1636). However, there were numbers of separated troops while it was one big frame that all troops were spread to Yeosan. It was broadly separated into three troops with three leaders, Yi Heung bal, Jo Su seong, and An Bang jun. The troop with leader, YI Heung bal, received order from Jeolla province chief, Yi Si bang, which was unified in the Mouicheong(organization of troop) in Yeosan. Although Uibyeong's leaders of each regions were selected and troops were formed, it was weakly assembled, so the accomplishment was also not great. On the other hand, the troops of Jo Su seong in Hwasoon region was formed with non-political people that resulted a strong union. The troop of An Bang jun centered with the political westerners(Seoin literati) also showed a strong assembly,regionally and scholastically. The troops of both present and past administrators led together as the council's request was less systematic than those troops that were led by particular leaders. When we see the constitution of people involved in these troops,most noblemen were involved with An Bang jun's troop. However,under Jo Su seong's troop, his own family members, servants, and farmers were engaged. The size of the Yi Heung bal's troop that was gathered in Yeosan seemed small, although it actually was not. Honam Uibyeong added with Jo Su seong's and An Bang jun's troops was a very extensive scale. These differences of each constitution of Honam troops brought some limits and troubles to leaders. Furthermore, it is an important fact here that there were many significant people who was also involved with Jeongmyo-Horan. For instance, An Bang jun was participated in the Imjin-Waeran(the Japanese Invasion in 1592), Yi-Gwal's rebellion, as a troop member, and later, he, again, involved in the Jeongmyo-Horan as a leader of a troop. In additions, those decedents of people who involved with those incidents were more likely to participate in such events. Meanwhile, there was a complications over the commandment between Jeolla province chief, Yi Si bang and Somosa(a troop commander) Jeong Hong Myeong, because of the disagreement came from their different opinions. Those who were not administrators of Joseon dynasty had thoughts of respecting the king and the Ming dynasty more importantly,but those who were involved with administration believed more significantly with the future of their political power. Honam Uibyeong asserted the justification from the beginning regardless of political affiliation.
유창규,송정규,이윤선,김재준 한국건축시공학회 2009 한국건축시공학회지 Vol.9 No.1
Looking at current construction costs estimations of publicly declared public works, there are many instances where estimation criteria are ambiguous and doesn't imply the reality. Up to date, estimation criteria for calculating construction cost estimations are simply by unit area multiplication and stochastic construction cost estimation. However, possibility of making errors are high due to using uniform data that excludes each public work's specifications and environmental conditions. Further, on the aspect of cost management, there is certain limitation in the efficiency of cost management in order-placing stage and commencing-work stage; while efficient cost management and reduction of expenses are highly possible during initial stages of the project. In this respect, the paper adopts positive approach with regards to construction cost estimations of public works and draws common elements from calculation tables of the construction cost estimations from 3 completed domestic construction works; after which, the paper analyzes whether business exposition, construction guide and publicly-declared estimated construction costs that the orderer issued are calculated economically and properly; deducing problems in the process, the paper seeks to recommend rational calculation method on this. Looking at current construction costs estimations of publicly declared public works, there are many instances where estimation criteria are ambiguous and doesn't imply the reality. Up to date, estimation criteria for calculating construction cost estimations are simply by unit area multiplication and stochastic construction cost estimation. However, possibility of making errors are high due to using uniform data that excludes each public work's specifications and environmental conditions. Further, on the aspect of cost management, there is certain limitation in the efficiency of cost management in order-placing stage and commencing-work stage; while efficient cost management and reduction of expenses are highly possible during initial stages of the project. In this respect, the paper adopts positive approach with regards to construction cost estimations of public works and draws common elements from calculation tables of the construction cost estimations from 3 completed domestic construction works; after which, the paper analyzes whether business exposition, construction guide and publicly-declared estimated construction costs that the orderer issued are calculated economically and properly; deducing problems in the process, the paper seeks to recommend rational calculation method on this.