• Journal of Environmental Science International
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• v.7 no.5
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• pp.591-598
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• 1998

This study was conducted to evaluate water quality in the Keum River estuary using principal component analysis. The results was summarized as follow; Water quality in the Keum River estuary could be explained up to 70.40% by three factors which were included in the inffluent loading by the Keum River and Kyungpo cheon(38.99%), seasonal variation and organic matter pollution(19.05%), sediment resuspension and internal metabolism(12.35%). For spatial variation of factor score, artificial pollutant loading is highest at st.1, below Keum River barrage, and decreases toward the outer sea. For annual variation of factor score, factor 1 was highly related to artificial pollutant leading, and it was gently increased in 1994. Also, organic matter pollution, sediment resuspension and internal metabolism were increased to every year. It is necessary to control the nutrient leading by Keum river and Kyongpo cheon for Water quality management of estuary.

• Korean Journal of Environmental Agriculture
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• v.19 no.1
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• pp.26-31
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• 2000

This study was carried out to investigate the changes of water quality, the pollutant loading by population, livestock, and land use at the Namdae-cheon in Keum river districts. Water samples were taken at the four sites of watershed, the nutrients of which were analyzed periodically from July, 1995 to April, 1998. Content of nutrients in water samples ranged from 1.8 to 5.8 mg/L for total nitrogen, from 0.01 to 0.08 mg/L for total phosphorus and from 0 to 0.007 mg/L for ortho-phosphate respectively. Nitrogen loading by pollutant unit was investigated 550.4 ton/yr as 358.1 ton/yr by livestock, 129.3 ton/yr by land use and 63.0 ton/yr by population. Phosphorus loading by pollutant unit was investigated 79.1 ton/yr as 60.6 ton/yr by livestock, 5.2 ton/yr by land use and 13.3 ton/yr by population. The loading of measured pollutant was investigated 452.5 ton/yr of nitrogen and 5.4 ton/yr of phosphorus in Namdae-cheon watershed.

• Archives of design research
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• v.19 no.1 s.63
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• pp.273-282
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• 2006

This study has evaluated the visual preference factor of Keum river sceneries which could vary according to the change of water level while other scenic environment near by the river did not change. 1) At Gap Cheon site, the variances of the visual preferences for river scenery at different water level are determined as emotional, physical, aesthetic and individual factor. At Mujoo site, the variances of the visual preferences are determined as only two factors such as emotional and physical factors. Those factors show significant relations. All of the visual preferences are increased as the increase of preference factors. Also decreasing of preference factors result in decreasing of visual preferences. 2) In multiple regression model, both the Gap cheon site and Mujoo site show that the increase of emotional factor affect most to visual preference when other conditions are fixed. The physical factor affect less than the emotional factor. At Gap cheon site, the relative importance level which the preference factors contribute to the visual preference appears as the order of emotional, physical, aesthetic and individual factor. Emotional factor's importance level is 4.2 times greater than individual factor. At Mujoo site, the relative importance level which the preference factors contribute to the visual preference appears as the order of emotional and physical factor. The emotional factor's importance level is 1.1 times greater than physical factor. It is clearly indicate that the emotional factor is most important preference factor in both study sites. The factor analysis results of Keum river scenery at different water level using the visual evaluation method affect a lot to the quantification of river instream flow and water level.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.92.1-92
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• 2001

Sliding mode control of spacecraft attitude tracking with actuator, especially reaction wheel, is presented. The sliding mode controller is derived based on quaternion parameterization for the kinematic equations of motion. The reaction wheel dynamic equations represented by wheel input voltage are presented. The input voltage to wheel is calculated from the sliding mode controller and reaction wheel dynamics. The global asymptotic stability is shown using a Lyapunov analysis. In addition the robustness analysis is taken for nonlinear system with parameter variations and disturbances. It is shown that the controller ensures control objectives for the spacecraft with reaction wheels.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.669-672
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• 2004

The thin-film passivation technology using the poly-para-xylylene (parylene) was applied to polymer electroluminescent devices. The fabricated device shows a good luminescent characteristic of maximum 11640 cd/$m^2$. The measured lifetime was reached up to 28 hours, which means the effectiveness of the passivation. Applying the parylene thin-film passivation technique, 10${\times}$10 passive matrix display system was implemented and obtained some still images.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.445-448
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• 2006

Bias stress effect in pentacene organic thin-flim transistors with cross-linked PVA gate dielectric is analyzed. For negative gate bias stress, positive threshold voltage shift is observed. The injected charges from the gate electrode to the defect states of gate dielectric are regarded as the main origin of $V_T$ shift. The reduced bias stress effect using $SiO_2$ blocking layer confirms the assumed mechanism. It is also demonstrated that the inverter with $SiO_2$ blocking layer shows the negligible hysteresis owing to the reduced bias stress effect.

• Journal of Korean Medical classics
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• v.24 no.5
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• pp.67-81
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• 2011

Objective : Several kinds of food could be materia medica within food-therapy in oriental medicine. "Sikryochanyo" is a book about food-therapy totally. So there are many kinds of food are treated as materia medica. Method : Finding out cases of food-therapy with chicken in "Sikryochanyo" Result : In "Sikryochanyo", there were many ways of food-therapy with chiken. Chicken was treated as materia medica even though it was a forbidden food when someone got sik especially with fever because of the effects. Conclusion : On several types such as parts, colors, methods to make, of chicken, there are plenty of usage with its own effectiveness.

• Korean Journal of Environmental Agriculture
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• v.16 no.1
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• pp.19-24
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• 1997

This studies was carried out to investigate the soil contamination and water quality affected by agricultural activities in the Keum river Districts. Soil pH of the Keum river districts were $5.56{\sim}7.09$ in Keum river headwater and Namdae-cheon but that of Keumgang-lake were $5.07{\sim}7.21$ because of the cattle shed and industrial complex around. Total nitrogen contents of soils were found difference as period of fertilizer application. Total phosphorous content of soils no difference were found between the headwater and Keumgang-lake. Heavy metal contents of soils were natural background level. Water pH of the Keum river districts ranged from 6.59 to 7.80 and COD was maintain below 1.0 mg/L. Total nitrogen content affected by a livestock wastes and sewage water were the higher than that of others and total phosphorous content showed below 0.5 mg/L. Nitrate nitrogen and ortho-phosphate contents were very high according to the influence a livestock waste and sewage water in headwater region of the Keum river partly. Chlorine and sulfate contents were high according to the influence of sea water invasion. Heavy metal contents of waters were natural background level.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.54 no.4
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• pp.416-421
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• 2009

This experiment was conducted to find out optimum priming treatment conditions to the sesame seed as a preliminary study for enhancing sesame germination properties. Effective priming agents and concentrations for sesame seed were $K_3PO_4$, 200 mM and PEG6000, -1.0 MPa respectively. Optimum priming temperature and duration were $15^{\circ}C$, 4 days in view of germination speed and germination percentage. PEG6000 with -1.0 MPa was selected as an efficient priming treatment condition at $15^{\circ}C$, 4 days. This study suggested that priming treatment to sesame seed would be an effective technique enhancing sesame seed germination and shortening time to the $T_{50}$ at the field condition, but the efficiency of priming treatments to the sesame seed would be strongly dependent on individual or integrated conditions of priming agent, concentration, temperature and duration etc.

• Journal of Physiology & Pathology in Korean Medicine
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• v.18 no.5
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• pp.1254-1269
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• 2004

The contents of Fang Sheng Shuai Lun(방성쇠론) is the rise and fall of five viscera(heart, lungs, liver, spleen, kidneys)'s Yin-Yang Energy is related to change of human body's condition and how to diagnose this change. This chapter comment on change of Yin-Yang Energy under seasons and age, change of dream under deficient of five viscera's chi, notice of diagnosis and diagnostic technique on deficient of five viscera's chi.