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김중완,최영철,김재헌 동아대학교 생산기술연구소 2001 生産技術硏究所硏究論文集 Vol.6 No.1
The results of this research is shown confirmly need and effect of closed loop control using ECP Model 505 Inverted Pendulum This is not construction as normal load-on cart Inverted Pendulum. This linkage mechanism includes a moment-arm counter-load to be able to adjust and control perpendicular and the horizon bars. It controled both horizontal bar and vertical bar for control inverted pendulum in gravity field. ECP Model 505 Inverted Pendulum system achieved PID, VSC for non-minimum phase and conditional stability plant (right-half plane poles and zeros) by adjusting Position of centered mass. Especially, the result of variable structure control was finely shown high performance of closed loop control that compensate unstable situations for multi-degree systems.
김범철,박주현,허우명,임병진,황길순,최광순,최종수 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-
In this study limnological characteristics of Lake Juam was surveyed from June 1993 to May 1994 in order to provides important information regarding water resources. Seschi disc transparency, epilimnetic chlorophyll a(chl-a), tatal nitrogen(TN), total phosphorus(TP) concentration and primary productivity were in the range of 2.0~4.5 m, 0.9~13.6 mgChl/㎥, 0.78~2.32N/l, 11~56 mgP/㎥, 270~2,160mgCm^(-2)day^(-1), respectively. On the basis of TP, Chl-a and Secchi disc depth, the trophic state of Lake Juam can be classified as mesotrophic lake. The phosphorus inputs from non-point sources are concentrated in heavy rain episodes during the monsoon season. As a result, phosphorus concentration are higher in summer than in winter. TP loading from the watershed were estimated to be 0.9 gPm^(-2)yr(-1), which correspond to a boundary of the critical loading (1.0 gPm^(-2)yr(-1), which correspond to a boundary of the critical loading (1.0 gPm^(-2)yr(-1)) for eutrophication. From the results of the algal assay, both phosphous and nitrogen act as limiting nutrients in algal growth. The seasonal succession of phytoplankton community structure in Lake Juam was similar to that observed in other temperate lakes. Diatoms(Asterionella formosa and Aulacoseira granulata var. angustissima) were dominant in spring and winter, cyanobacteria (Microcystis aeruginosa, M. sp. and M. viridis) were dominant in warm season. The organic carbon, nitrogen and phosphorus content of lake sediment were 9.5~14.0 mgC/g, 1.01~1.82 mgN/g, and 0.51~0.65 mgP/g, respectively. The allochthonous organic carbon loading from the watershed and autochthonous organic carbon loading by primary production of phytoplankton were determined to be 1,122 tC/yr and 6,718 tC/yr, respectively. To prevent eutrophication of Lake Juam, nutrient management of watershed should be focus on reduction of fertilizer application, proper treatment of manure, and conservation of topsoil as well as point source.
김재중,김철현,김영의 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1
The concept of wave spectrum which represents the random characteristics of waves is introduced and analyzed in this study. Also time series analyses are done by using numerical model that computes the random wave transformation in the nearshore region. The characteristics of shoaling and refraction of random waves which is incident on the straight shorelines with parellel bottom contours are studied using the stecturm analysis. JONSWAP spectum in the deep water depth was converted into TMA specturn in the shallow water detph. TMA spectrum computes the spectrum of wind waves in finite water depth as a funtion of frectrum. This study way be helpful to determining the representative wave height and period for the random deseign waves of coastal structures in the shallow water.