• Title/Summary/Keyword: Fur quality

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Water Quality and Correlation Analysis Between Water Quality Parameters in the Hwaong Watershed (화옹호 유입하천의 수질현황 및 수질항목간의 상관관계)

  • Jung Kwang-Wook;Yoon Chun-Gyeong;Jang Jae-Ho;Jeon Ji-Hong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.48 no.1
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    • pp.91-102
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    • 2006
  • Most projects of tideland reclamation with dike construction produce estuarine reservoirs, which may result in water quality problems due to blocking of natural flow of stream water to the sea. External loadings to the reservoirs through tributaries are major concerns in a concerned water quality management. The water quality of a reservoir is greatly influenced by watershed drainage, and accurate estimation of pollutant is indispensable for in the reservoir management. Concentrations of the microorganisms in stream water and conventional parameters were monitored in the 13 water quality monitoring sites located in a rural watershed of Hwaong estuarine reservoir. The indicator of microorganisms showed strong correlation between them, and regression equations with $R^2\geq0.70$ may be used fur estimating one from other microorganisms. The relationships between water quality parameters obtained in this study may be used to infer one unknown pollutant concentrations from the measured pollutant loadings. This methodology could be applied to other areas where the watershed characteristics are not significantly different from the study area. High concentrations of nitrogen was observed in water quality monitoring sites affected by urban land uses and numbers of livestock in wet day as well as dry day, due to the influent of diffuse sources.

Development and Application of Freshwater Lake Water Quality Management System(ELAQUM) through the Linkage of Watershed and Freshwater Lake (유역과 담수호를 연계한 담수호 수질관리 시스템 개발 및 적용)

  • 김선주;김성준;김필식
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.44 no.6
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    • pp.124-136
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    • 2002
  • A freshwater lake water quality management system(FLAQUM) was developed to help regional manager for the water quality of a rural basin. The integrated user interface system FLAQUM written in Visual Basic, includes three subsystems such as a database management system, basin pollutant loads simulation model using SWMM model and freshwater lake water quality simulation model using WASP5 model. Pollutant load simulation model was applied to simulate the discharge and pollutant loading from the watershed, and freshwater lake water quality model was applied to analyze the changes in water quality with respect to watershed pollutant loads, and this model could be used in planning to control watershed pollutant source for water quality management. Database management system was constructed fur all input and output data processing, and it can be used to analyze statistical characteristics using constructed data. Results are displayed both graph and text for convenience of user. The results of FLAQUM application to Boryeong freshwater lake showed that the lake was in eutrophic condition. The major contribution of pollution comes from tributary No.1 and No.4, which have a large number of livestock farms. Therefore, water quality management must be focused on appropriate management of the livestock farming in the two breanchs.

Non-point Source Pollution Modeling Using AnnAGNPS Model for a Bushland Catchment (AnnAGNPS 모형을 이용한 관목림지의 비점오염 모의)

  • Choi Kyung-Sook
    • Journal of The Korean Society of Agricultural Engineers
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    • v.47 no.4
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    • pp.65-74
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    • 2005
  • AnnAGNPS model was applied to a catchment mainly occupied with bushland for modeling non-point source pollution. Since the single event model cannot handle events longer than 24 hours duration, the event-based calibration was carried out using the continuous mode. As event flows affect sediment and nutrient generation and transport, the calibration of the model was performed in three steps: Hydrologic, Sediment and Nutrient calibrations. The results from hydrologic calibration for the catchment indicate a good prediction of the model with average ARE(Absolute Relative Error) of $24.6\%$ fur the runoff volume and $12\%$ for the peak flow. For the sediment calibration, the average ARE was $198.8\%$ indicating acceptable model performance for the sediment prediction. The predicted TN(Total Nitrogen) and TP(Total Phosphorus) were also found to be acceptable as the average ARE for TN and TP were $175.5\%\;and\;126.5\%$, respectively. The AnnAGNPS model was therefore approved to be appropriate to model non-point source pollution in bushland catchments. In general, the model was likely to result in underestimation for the larger events and overestimation fur the smaller events for the water quality predictions. It was also observed that the large errors in the hydrologic prediction also produced high errors in sediment and nutrient prediction. This was probably due to error propagation in which the error in the hydrologic prediction influenced the generation of error in the water quality prediction. Accurate hydrologic calibration should be hence obtained for a reliable water quality prediction.

The Influence of Extrudate Microstructure of Die Cooling Using $N_2$ gas in Hot Extrusion for Al 6061 Alloy (Al 6061의 열간압출시 질소금형냉각이 압출재의 미세조직에 미치는 영향)

  • Ko, D.H.;Yee, S.H.;Ko, D.C.;Kim, B.M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.50-53
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    • 2008
  • It's so difficult to obtain simultaneously both product quality and improvement of the productivity of which products are in hot aluminum extrusion process. But significant improvements in productivity and extrudate quality result from die cooling system using nitrogen gas injection during aluminum hot extrusion. These benefits are due primarily to cooling effect nitrogen gas and removal of excess heat in the extrudate temperature. This investigation is carried out hot extrusion experiment, also compared cooling system with non-cooling system to inspect cooling effects on hot aluminum extrusion. The purpose of this investigation is estimated the grain growth fur the extrudate quality, and the ram speed for the improvement of the productivity.

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Signal qualification method for high density disk (고밀도 디스크를 위한 신호 품질 평가 방법)

  • Park Hyun-Soo
    • Transactions of the Society of Information Storage Systems
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    • v.1 no.1
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    • pp.53-57
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    • 2005
  • In order to measure signal quality of optical disc such as CD or DVD, jitter is used traditionally. The signal attained from a disc by optical pick-up is processed by analog circuits. And then, binary signal can be obtained by using proper silcer. After the signal is changed into binary format, jitter is calculated as a time difference between the binary signal and the reference time. Jitter is used to express the signal quality. In this paper, a new method that is able to offer more precise measurement of the signal quality fur high density optical disc than the jitter is proposed. We named it LPSNR (Level Peak Signal to Noise Ratio). The relationship between bER (bit error rate) and LPSNR is shown in the paper.

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웹 사이트 유형별 성공 요인 비교 분석

  • 임미희;최수영;이희석
    • Proceedings of the Korea Inteligent Information System Society Conference
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    • pp.349-359
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    • 2003
  • Finding the factors to affect the success of the business web sites is critical to enhance their competitiveness. This paper categorizes these factors into 4 quality measures: system information, service and entertainment. The success is measured via user's satisfaction and loyalty. It surveys 474 Internet users to find the effect of the quality measures on web site success empirically. We confirm the causal effect of quality factors on users' satisfaction and loyalty. Furthermore, a comparative study is performed fur Web site types, such as finance, e-commerce (shopping mall), and entertainment. We note that the effect differs in web site types.

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Design and Quality Assurance Tests of Drilled Shafts of High Rise Buildings (고층 건물 현장타설말뚝기초의 설계 및 품질확인시험)

  • Cho, Chun-Whan;Seok, Jeong-Woo
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.585-592
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    • 2006
  • Recently, many high rise buildings is planning and under construction over the world. The drilled shafts as a foundation of high rise buildings are often adopted fur the purpose of construction safety and construction cost effectiveness. It is common that the capacity of drilled shafts is beyond conventional conception. The reasonable design and quality assurance for the drilled shaft as foundation of high rise building become much more important since the drilled shafts should bear much higher working load. This paper reviews state of the art of the design and quality assurance for the drilled shafts as foundation of high rise buildings. And also some related suggestions are given in this paper.

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Quality Assessment by Analysis of Yoke Caulking Process Considering Strain Rate Sensitivity (변형률속도 민감성을 고려한 요크 코킹공정의 해석에 의한 품질 평가)

  • 박문식;강경모;한덕수
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.6
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    • pp.37-46
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    • 2003
  • This paper is to predict quality deterioration resulting from a caulking process of yoke which is a part of automotive steering system. The caluking is a plastic deformation process involving such as impact of high speed tool, contacts between part and fixtures and strain rate sensitivity of the part material. Elaborate application of finite element method is neccesary to calculate changes of part dimensions because they fall into a level of tolerances. Simple work hardening and strain rate sensitive model is proposed fur the material and applied for the simulation by using Abaqus which is able to cater for elastoplastic rate sensitive material and contacts. Numerical results of test models that represent tensile bar and tensile plate are compared with material data inputs. Dimensional changes for the yoke are calculated from simulations and compared to the mesurements and they show good agreement. The method presented here with the material model proved to be valuable to assess quality deterioration for similar metal forming processes.

Policy Supports and Directions for improvement on Quality of Rural Housing in Korea and America (농촌 주거의 질 향상을 위한 지원현황과 정책방향)

  • Jeon, Yeong-Mi;Kim, Eun-Young
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • pp.229-234
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    • 2003
  • The purpose of this study is to suggest basic data to establish policy directions for improvement on quality of rural housing in Korea. A literature survey were used fur study The contents of survey includes policy supports in rural Korea and rural America. The results of the study grasped the situations that the newly built and repair, a vacant house, landscape and welfare with the support of rural housing policy in Korea. Also rural affordable housing policy examined supports of RHS programs in USDA variously. Based on the results, some policy directions to rural housing and community were suggested.

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The Handover Algorithm That Considers The User's Mobility Pattern In Wireless ATM

  • Kim, Hoon-ki;Kim, Young-joon;Jung, Jae-il
    • Proceedings of the IEEK Conference
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    • pp.553-556
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    • 2000
  • This paper suggests the way to perform the handover by predicting the movement route of the mobile terminal by considering the movement pattern of the user. By considering the fact that the most users has the constant movement pattern, the channels needed fur the handover can be reserved, and the required quality of service (QoS) is maintained during handover. The suggested algorithm makes the channel allocation schemes more efficient.

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