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허우명,이상균,권상용,김동진,김범철 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-
Water quality and pollution state of Lake Chungcho were evaluated during three years from 1998 to 2000. We surveyed physicochemical parameters, and TSI(trophic state index) was calculated using TP, Chl. a, and SD(secchi disc transparency) data of growing season average. Water samples were collected bimonthly except freezing season. During the study period, total annual precipitation in 1998, 1999 and 2000 year was 1,797, 1,722 and 1,345 mm, respectively. Salinity and conductivity were high (29.3±5.5 ppt, and 45,105±7,585 μS/cm) then other lagoons in the Eastern Coast of Korea. Chemocline was formed by salinity at 0.5~1.5m water depth. As a result of this, DO concentration of hypolimnion was below 3.0 mgO₂/L. Especially, when intense chemocline was formed, temperature of hypolimnion was higher than epilimnion. Secchi disc transparency, chlorophyll a, and COD were 0.8±0.3m, 15.7±20.7 mg/㎥, and 3.1±0.8 mgO₂/L, respecively. Most of TN/TP ratios below 20, but concentration of TN and TP was high. Values of TSI ranged between 59 and 77, indicating a eutrophic condition in this system.
허창두,신남철,우성훈,박승조 東亞大學校 附設 環境問題硏究所 2004 硏究報告 Vol.26 No.-
The aim of this study was investigated with the behavior of parathion adsorption and degradation efficiency of parathion in various samples loaded with earthworm casting. Adsorption capacity of parathion in loam soil was better than clay loam. Degradation of parathion was 70 percent in loam and clay loam soil to time but samples was loaded 5% casting, L0C5 and CLC5 had shown 90 percent degradation. We found that parathion was leachers pesticide as groundwater ubiquity score (GUS) was more than 4.0.
허진철,황재삼,강석우,윤치영,이상한 慶北大學校農業科學技術硏究所 2007 慶北大農學誌 Vol.25 No.-
In order to investigate the availability of insect resources for agrobiotechnological or medical purposes, we examined antioxidant (DPPH and FRAP assay) and cell viability by oxidant stress and NO inhibition assay by treatment of the extracts of Statilia maculata Thunberg, Tenodera angustipennis Saussure and Tenodera aridifolia Stoll. We found that Tenodera angustipennis Saussure and Tenodera aridifolia Stoll extract (DW, etanol, methanol) had high levels of anti-oxidant activity, whereas Tenodera aridifolia Stoll extract showed increased cell viability by hydrogen peroxide and inhibition of NO production. These findings suggest that Statilia maculata Thunberg, Tenodera angustipennis Saussure and Tenodera aridifolia Stoll, extract have potentials to be developed for agrobiotechnology or medicinal use, indicating that mechanistic study including inhibition against molecular inflammation will show a possibility for the development of useful insect resources.
우정인,고성현,진해중,허태원 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1
This paper presents a novel current control system in order to eliminate the steady state control error for three-phase voltage source PWM converters. A general mathematical model of the converter which is represented as a state-space model is estabblish. The state-space model is used for simulations of the converter with the proposed tracking control system of sinusoidal current. In this system, a novel current control which do not require coordiante transformations using internal principle of PI controller is described. It is iproved that the steady state deviation reduce to zero from the transfer function fo source current control system. Finally, simulations show good source current control characteristics by means of the simplified control algorithm which do not require coordinate transformations.
이상하,최재석,이광열,장영수,임인수,허우명,김재구,김범철 강원대학교 부속 환경연구소 2005 Journal of the Environment Vol.2 No.-
To investigate nutrient dynamics of the lake and fish community, both water and fish samples were collected at three different areas (dam site, upper inflowing and downstream of lake outfow) for one year from Sep.2004 to Aug.2005 During the experimental periods, mean concentration of chl, a in epilimnetic layer (0-5m) was 18.5mg^(-3) and transparency ranged from 0.3m to 2.4m, respectively. In nutrient, mean concentrations of TP and TN were 111 mgP m^(-3) and 4.4 mgN L^(-1), respectively. Based on the water quality standard suggested by U.S.EPA(*1976), the trophic state of Lake Doam was classified as eutrophic state. Total number of fish collected in Lake Doam was 9,600 indiveduals in 26 species of 6 family. Sixteen of Korean endemic soecies including H. mylodon, A. signifer, P. tenuicorpa occurred. O. mykiss as introduced fish was also found in Lake Doam. Dominant and subdominant species were P. herzi and Z. platypus that took about 34.6% and 22.5% of total fish composition, respectively. Six species including A. signifer. P. tenuicorpa. and R. kumgangensis were rare in Lake Doam. Pelagic typw of figh commonly occurred at upper regions, whereas benthic type was mainly domenated at downstream area. Therefore, pollution source inflowed from the upper regions did not seriously affect downstream area (Songcheon water system) due to the role of dam as pollutant barrier. In addition high appearance of Comat type of fish that si hybrid between gold fish (C.auratus) and C. auratus was found in the lake, It was unclear the reasons that high prorortion of mutant species apperared in the lake. Further more researches are required in this area.