• 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.

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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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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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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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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A Case Study on Reusing Maintenance and Alterations by the Elderly Residing Melbourne and Sydney in Australia (호주 재택 노인을 위한 주택수리 및 개조사례 연구 - 멜버른과 시드니를 중심으로 -)

  • 이영심;이상해
    • Journal of the Korean housing association
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    • v.13 no.1
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    • pp.44-52
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    • 2002
  • As a result of the expansion of the nuclear family in society, there has been an increase in the number of elderly people who want to live independently of their children. Australia is one of the countries which has initiated an extensive welfare program for its senior citizens. These services include maintenance of, and alterations to their own homes to make living conditions safer and more manageable. This case study was aimed at finding ways of adapting the services provided in Australia, to meet the needs of elderly Koreans who are in similar situations. It evaluated houses which had been renovated and altered fur the normal as well as the disabled elderly in both Melbourne and Sydney. results of research were as following : 1) Most elderly usually wished to remain as long as possible in their own home and it made them very stable in psychologically. 2) Housing maintenance and alterations were provided as one of social care services fur elderly with low expense and loan from government. 3) Many elderly were also getting various kinds of social services, fur example, meals on wheels, transportation and cleaning service with housing alterations and these ones let their quality of life more improved. 4) Occupational therapist and Architect were always involved in the process of housing alterations for disabled elderly. 5) The alterations which related to bathroom, toilet and steps were very popular and those were considered essential design guide applications for planning of housing for elderly in the future.

Morphological Filter for Enhancement of Monumental Inscription Image (금석문 영상 향상을 위한 형태학적 필터)

  • 김기석;최호형
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • pp.311-317
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    • 2001
  • The study on Shilla monumental inscription has beer accomplished by many historians. However, the research on enhancement of monumental inscription image using digital image processing technique is not sufficient. The preprocessing using computer is needed fur accurate interpretation of history. In this paper, digital image enhancement algorithm based on mathematical morphology for noise reduction and character clearness is proposed. In the experiment, the subjective image quality is improved using the proposed algorithm.

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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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