• Journal of Korean Society of Water and Wastewater
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• v.26 no.6
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• pp.871-881
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• 2012

This study suggested a model that can predict a degradation condition over time of two plastic pipes, PE and PVC, which are currently used in the country. This study was analyzed physical characteristics change of plastic pipes by comparison with initial physical characteristics (on the case of new pipes). Since this is dependent on accidents that already occurred, there are limitations that it only decides a priority on improvement based on relative corrosion status rather than precautionary aspects. The comparison results between physical degradation by the deducted performance rating and a conventional numerical scoring method showed that correlation coefficient was 0.67 for PE pipes and 0.86 for PVC pipes, indicating a high correlation. According to this result, it has been decided that the performance rating suggested herein can be applied naturally to the criterion of an improvement decision, which was based on Scoring System. From results of the research, it is expected that a reliable result can be provided to an improvement decision process related to degradation of plastic pipes by comprehensively comparing and evaluating a condition of pipe materials(direct factors) and an environmental impact(indirect factors).

• The Journal of Pediatrics of Korean Medicine
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• v.14 no.1
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• pp.137-152
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• 2000

The purpose of this study was on effect of Bopejungcheuntang(BPJC) for atopic dermatitis. During 5 months between January and May 2000, BPJC water extract administered to patient suffering from atopic dermatitis, in Dep. of Pediatrics, Dongguk university Pundang Oriental Hospital and this study was conducted for 27 patient (male 17, female 10) The result were as follows 1. The distribution of remedial values were improvement (51.9%), unresponsiveness(37.0%), depravation(11.1%). 2. After dispensing BPJC, ordinal sites of atopic dermatitis were inner space of elbow and knee joint, face and neck, back and abdomen, wrist and ankle. Befor and after dispensing BPJC this ordinal sites were similar but after dispensing BPJC, the other sites except head is improved. Order of symptomatic improvement is itching, licheniasis, erythema, exudate. Both itching and exudate is significantly improved. 3. According to way of water extract, symptomatic improvement is most excellent with general water extract & distiled water, the second is general water extract, the third is distiled water. 4. BPJC effect on atopic dermatitis is not significantly affected by sex, day of falling ill, medical treatment, resident environment, feeding, character and duration of medical treatment.

• Journal of Korea Water Resources Association
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• v.41 no.3
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• pp.315-324
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• 2008

This paper double-bound dichotomous choice method as a contingent valuation methods is used to derive willingness to pay for the water quality at the Anyangcheon watershed. The linear random utility model show that value of improvement of the Anyangcheon watershed water quality is 4,930 won per house and month of the Seoul and Gyeong-gi area residents. There is no difference between Seoul and Gyeong-gi area residents. Respondents overall accepted the contingent market and were willing to contribute a significant amount (3,860 to 5,101 won), on average, per household per month. The aggregate value of the water quality improvement in the Anyangcheon watershed amounts to approximately 83.0 to 109.7 billion won per year. This study is expected to contribute to the decision-making process for policy-makers by providing useful methodological framework and quantitative information related to watershed improvement projects.

• KCID journal
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• v.19 no.1
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• pp.19-29
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• 2012

The data of the agricultural water quality survey network was analyzed between from 1990 to 2010 in order to propose effective plans for water quality management by analyzing the characteristics of agricultural lakes and the change of water quality. The result of the analysis shows that there is a correlation between water quality and items that can be a function of water depth such as dam height, dam length, dam height/dam length ratio and active storage/surface area of lake ratio. This means that, Korean agricultural lakes, there is a correlation between water quality and water depth. Water quality of the lakes that have lower than 5m of active storage/surface area of lake ratio (effective water depth) especially tends to get worse rapidly. The Chl-a and COD concentration of Korean agricultural lakes have a tendency to increase between June and September. Therefore, we recommend first taking a water quality improvement project for the lakes preformed watershed management project, and taking a preventive short-term water quality improvement project for the unperformed lakes before June among lakes that have lower than 5m of effective water depth.

• The KSFM Journal of Fluid Machinery
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• v.17 no.5
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• pp.37-42
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• 2014

In Korea while the dam or reservoir is an important water resource, the value of this water resource is deteriorating by thermal-induced stratification. To ameliorate the water quality of reservoir by breaking stratification the use of air diffuser system is now widespread in Korea. According to the previous research, dynamics of bubble plume and destratification efficiency depended upon two dimensionless groupings; Mh and Pn suggested by Asaeda et al (1993). However, these two variables only include Q, N, H, g, u. and installed Boryeong reservior in appropriate width of water aeration, air dose and number of installations after calculating by applying these figures. This paper is performed to find out effect analysis about water aeration improvement to break thermal stratification.

• Magazine of the Korean Society of Agricultural Engineers
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• v.42 no.5
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• pp.94-102
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• 2000

Investigated was the effectiveness of a constructed wetland system on water quality in Hwa-Ong estruarin reservoir, located in Hwasung-Gun, Kyunggi-Do. Procedures for estimation of pollutant loading from watershed and required area for natural systems, and simulation of corresponding reservoir water quality were reviewed. Generally, simulated reservoir water quality was within the reasonable range, and about 15% of total polder farmland was required to meet the agricultural water quality standards. The model was applied based on the current loading condition without additional treatment systems. Wetland system is an ecologically sound treatment system. Therefore, natural systems can be an alternative measure for water quality improvement in polder projects. The area for natural systems was estimated using literature value which might be acceptable at the planning stage. However, pilot system and its experimental data are requisite for large scale field application. WASP5 was proved to be a useful and versatile model, and its application to estuarine reservoir water quality simulation was thought to be appropriate.

• Composites Research
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• v.26 no.3
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• pp.165-169
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• 2013

This work presents the tensile properties and water uptake behavior of plasma treated abaca fibers reinforced epoxy composites. The composites were prepared by vacuum assisted resin transfer molding. The effects of treatment on tensile properties and sorption characteristics of abaca fiber composites in distilled water and salt solution at room temperature were investigated. The tensile strength of the composites increased with plasma treatment. With plasma treatment, an improvement of 92.9% was obtained in 2.5 min exposure time in plasma. This is attributed to high fiber-matrix compatibility. Less improvement on tensile properties of hybrid treatment of sodium hydroxide and plasma was obtained. However, both treatments reduced overall water uptake in distilled water and salt solution. Hydrophilicity of the fibers decreased upon plasma and sodium hydroxide treatment, which decreases water uptake.

• Proceedings of the Korean Geotechical Society Conference
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• 2002.10a
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• pp.553-560
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• 2002

The improvement effect of soft ground is estimated by unconfined strength mainly. The unconfined strength of solidification agent treated soil is likely to vary with ununiformed mixing ratio and water content change of in-situ ground place by place. So, it is unreasonable to apply a solidification agent mixing ratio obtained from laboratory test results on all over the soft ground. In this study, it was analysed how the unconfined strength would be effected by the water content of soft ground. For this study, a series of unconfined compressive tests are peformed on various water content soil samples. The test results showed that the strength was fallen to 30∼80% by two times increase of water content approximately, This means that strength of solidification agent treated soil is influenced greatly by water content of raw soft ground and mixing ratio of solidification agent. It was suggested that the method how to decide the mixing ratio with soft ground water content.

• Journal of the Korean Society for Environmental Technology
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• v.19 no.6
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• pp.514-527
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• 2018

This study formed a scenario to improve a water quality by expecting and analyzing a water quality of Jeollabuk-do Seomjingang water system, so calculated a result. As a result, it was analyzed that a water quality is improved at 15.32 % of the maximum BOD, 7.17 % of T-N, and 62.86 % of T-P according to domestic and livestock cut amount by reinforcing discharge water of sewage disposal plant and improving pollutant management plans. It was analyzed that supplementing various cut plans such as establishment of efficient cut plans, plans to decrease pollution loading amount, plans to increase sewage disposal efficiently, pollutant decrease through an expansion of sewage disposal area, and energy recovery from animal dung of Total Pollutant Load Management System, and developing a study on more efficient improvement plans of water quality by considering natural increase and economic development are efficient in an improvement in a water quality.

• Journal of Haehwa Medicine
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• v.20 no.2
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• pp.79-89
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• 2012

Objective : This study was conducted to evaluate of efficacy and safety of Vanadium Water (VW) on Cancer related Fatigue of Non-advanced Cancer Patients. Methods : Experimental Group Administration. Participants in treatment group consumed three 500 ml/bottle bottles of Jeju Island's VW, which contains 40.2 ${\mu}g/L$ of vanadium, three times a day (morning, afternoon, evening) for 4 weeks (28 days) without any additional treatments for fatigue improvement. The control group participants consumed three 500 ml/bottle bottles of ordinary water (0 ${\mu}g/L$ of vanadium) three times a day for the same period of time without any additional treatments for fatigue improvement. Results : After 4 weeks of VW consumption, total score of Revised Piper Fatigue Scale (RPFS) was reduced 30% and basal score after Fisher's Exact Test resulted statistical borderline significance (p=0.0799) and result of t-test of comparison between two groups' RPFS total score and fatigue cognitive/mood changes resulted statistical significance (p=0.0112). In detail, only 36.4% of control group (N=11) showed improvement while 77.8% of treatment group (N=9) showed fatigue improvement and thyroid hormone level changes. No other lab measures indicated any significant differences between two groups. Conclusion : Daily consumption of 1.5 L of Vanadium water for 4 weeks showed improvement of non-advanced cancer patients' fatigue.