• Korean Journal of Environmental Agriculture
• /
• v.33 no.1
• /
• pp.30-36
• /
• 2014

BACKGROUND: Best management practices are often implemented to control nonpoint source pollutants. Best management practices need to be simulated and analyzed for effective Best management practices implementations. Filter strip is one of effective Best management practices in agricultural areas. METHODS AND RESULTS: Soil and Water Assessment Tool model was selected to explore the effectiveness of filter strip to control total phosphorous in Golji watershed. Soil and Water Assessment Tool model was calibrated for flow and total phosphorous by Sequential Uncertainty Fittin ver.2 algorithm provided in Soil and Water Assessment Tool-Calibration and Uncertainty Procedures. Three scenarios defined by filter strip width were applied. The filter strip width of 5 m was able to reduce the most amount of total phosphorous. In other words, the total phosphorous reduction by filter strip of 5 m was 28.0%, while the reduction was 17.5% by filter strip of 1 m. However, the reduction per unit filter strip width were 17.4%, 8.0%, and 4.5% for 1 m, 3 m, and 5 m of filter strips, respectively. CONCLUSION: Best management practices need to be simulated and analyzed so that the BMP scenario can be cost-effective. A large size of BMP might be able to control large amount of pollutants, however it would not be indicated as a cost-effective strategy.

• Journal of Agricultural Extension & Community Development
• /
• v.16 no.3
• /
• pp.643-668
• /
• 2009

The purpose of this study is to estimate the value of the sociocultural multifunctionality of rural areas in Korea. The sociocultural multifunctionality of rural areas consists of emotional comfort, green landscape, cultural heritage, and rural viability values. The value of the sociocultural multifunctionality was assessed by contingent valuation method incoporating preference uncertainty. The log-logit models indicated that households were willing to pay 14,027~26,757 won per month and the model with preference uncertainty gave the highest WTP. WTP was affected by respondent's sex, location, awareness of relation with multifunctionality and others. The total value of sociocultural multifunctionality of rural areas in Korea estimated to 2,691~5,134 billion won per year.

• Environmental Engineering Research
• /
• v.18 no.3
• /
• pp.123-128
• /
• 2013

The purposes of this study were to determine the efficiency of using a badge-type diffusive sampler to measure formaldehyde concentrations indoors, and to evaluate the uncertainty associated with the use of data from a diffusive sampler. A diffusive sampler using 2,4-dinitrophenylhydrazine (DNPH) reagent was found to be a suitable tool for measuring the formaldehyde concentration in an indoor environment. The agreement between results of the diffusive sampler and DNPH cartridge were good, showing a correlation coefficient of 0.996. The sampling rate for the diffusive sampler was calculated to be 1.428 L $hr^{-1}$, with a standard deviation of 0.084 L $hr^{-1}$. It was found through analysis that the uncertainty associated with the sampling rate and the mass of the formaldehyde transported into the diffusive sampler by diffusion was the dominant contributor to the total.

• The Transactions of the Korean Institute of Electrical Engineers B
• /
• v.51 no.11
• /
• pp.622-627
• /
• 2002

The power comparison techniques have implemented power measurements, in which a power comparator is used to balance ac against a dc power obtained from known values. The developed power standard system using the comparison techniques consists of dc sources, ac source, control switches, resistive voltage dividers, resistive shunts and a power comparator. The total uncertainty of the power standard system was proved by analysis of the component instruments. Its expanded(k=2) uncertainty is evaluated to be less than 30 uW/VA at unit power factor and 42 uW/VA at power factor 0.5

• Journal of the Korean Solar Energy Society
• /
• v.21 no.3
• /
• pp.25-32
• /
• 2001

The major purpose of this paper is to develop an uncertainty estimate for the calibration of thermopile instruments used to measure solar radiation parameters. We briefly describe the solar radiation parameters most often measured, instrumentation, reference standards, and calibration techniques. The bulk of the paper describes elemental sources of error and their magnitude. We then apply a standard error analysis methodology to combine these elemental error estimates into a statement of total uncertainty for the instrument calibration factor. Our results allow one to evaluate the accuracy of a radiometric measurement using thermopile instrumentation in the light of the application, such as engineering test evaluation or for validation of theoretical models.

• Journal of the Korean Operations Research and Management Science Society
• /
• v.11 no.1
• /
• pp.44-50
• /
• 1986

In this paper, we find optimal policy for the (Q, r) inventory model under the lead time uncertainty. The (Q, r) inventory model is such that the fixed order quantity Q is placed whenever the level of on hand stock reaches the reorder point r. We first develop the single level inventory model as the basis for the analysis multi-level distribution systems. The functional problem is to determine when and how much to order in order to minimize the expected total cost per unit time, which includes the set up, inventory holding and inventory shortage cost. The model, then, is extended to the multi-level distribution system consisting of the factory, warehouses and retailers. In this case, we also find an optimal policy which minimizes the total cost of the contralized multi-level distribution system.

• Proceedings of the KIEE Conference
• /
• 1999.07b
• /
• pp.606-608
• /
• 1999

Mutual Recognition Agreement(MRA) between national metrology institutes is started on October 1999 and International Key Comparison is essentially to be used as technical basis for the agreement. High resistance is one of the Key Comparison and high resistance measurement system is established in KRISS for the purpose of the Key Comparison. Total combined uncertainty of the system is about 4ppm in $10M{\Omega}$ and 8ppm in $1G{\Omega}$. With the system, the difference of comparison results for $10M{\Omega}$ and $1G{\Omega}$ among KRISS, VNIIM in Russia and NIM in China is agreed about 6ppm within total combined uncertainty of three institutes.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.21 no.6
• /
• pp.1390-1397
• /
• 1996

In this paper, in case of segmenting an image by a fuzzy entropy, an image segmentation algorithm is derived under an extended fuzzy entropy including the probabilistic including the probabilistic information in order to cover the toal uncertainty of information contained in fuzzy sets. By describing the image with fuzzysets, the total uncertainty of a fuzzy set consists of the uncertain information arising from its fuzziness and the uncertain information arising from the randomness in its ordinary set. To optimally segment all the boundary regions in the image, the total entropy function is computed by locally applving the fuzzy and Shannon entropies within the width of the fuzzy regions and the image is segmented withthe global maximum andlocal maximawhich correspond to the boundary regions. Comtional one by detecting theboundary regions more than 5 times.

• Industrial Engineering and Management Systems
• /
• v.7 no.1
• /
• pp.34-43
• /
• 2008

In recent years, many electronics producing firms have looked upon total quality management (TQM) strategy as a means by which they could maintain competitive advantage. This empirical research evaluates TQM strategic factors in order to determine the critical success factors in environmental uncertainty. Fuzzy analytic hierarchy process (FAHP) is the proposed research methodology to discuss and tackle the different decision criteria like effective leadership, people management, customer focus, strategic plan and process management, being involved in identifying the TQM strategic critical success factors with uncertainty. The result shows that effective leadership is the most critical success factor in TQM strategy.

• Journal of Korean Clinical Nursing Research
• /
• v.28 no.2
• /
• pp.112-121
• /
• 2022

Purpose: This study aims to identify the effects of mobile web-based COVID-19 isolation hospitalization management training on patient's uncertainty, anxiety, and nursing education satisfaction. Methods: Patients hospitalized with COVID-19 isolation rooms from August to October 2021, in Medical Center B which is an infectious disease dedicated hospital located in metropolitan city B were included. The total number of subjects was 142, of which 71 were the experimental group and 71 the control group. As an experimental treatment, a total of 5 minutes and 35 seconds of mobile web-based education were provided to the experimental group three times, including the day of, the first day of, and the second day of hospitalization. Existing training conducted on the control group was provided by the nurses in charge of the ward through oral explanation using printed materials. The data were analysed using the IBM SPSS/WIN 26.0 program. Results: Significant differences were observed between the two groups in pre-and post-assessment of uncertainty scores (t=-22.92, p<.001), anxiety scores (t=-15.03, p<.001) and nursing education satisfaction score (t=11.61, p<.001). Conclusion: As a result of the above, mobile web-based education can be used as an effective educational medium in nursing practice to improve the work efficiency and quality of nursing care and contribute to improving the patient's educational satisfaction.