• Title/Summary/Keyword: select properties

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A Pilot Plant Study of Industrial Wastewater Recycling Technology for Disc-Tube Membrane (DISC-TUBE MEMBRANE을 이용한 산업폐수 재활용 기술의 PILOT PLANT적 연구)

  • 김동일;한성욱;김호식;김인환
    • Journal of environmental and Sanitary engineering
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    • v.12 no.3
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    • pp.81-86
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    • 1997
  • In case of Industrial Wastewater, It was various pollutions, high concentration and different physical, chemical properties each other in accordance with classification of wastewater. Therefore, after inquiring into the influence on the membrane of the dissolved pollutants, we should select the membrane of best efficient quality. As results of experiments on pilot plant test, optimum operating pressure for fouling removal was 34BAR, when continues operating was 34 BAR, recovery rate was 75% and permeate water flux was $32.9{\;}{\ell}/hr{\cdot}m^{2}$.

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Features of Epitaxial Garnet Films for an Atomic Traps Technique

  • Berzhansky, V.N.;Vishnevskii, V.G.;Nedviga, A.S.;Nesteruk, A.G.
    • Journal of Magnetics
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    • v.14 no.3
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    • pp.108-113
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    • 2009
  • High-coercive garnet films have certain parameters suitable for creating reconfigurable magnetic atomic chips with visible geometry. However, the inner stresses and morphological properties, namely, networks of dislocations, layering and surface relief, and dependence of coercivity on thickness must be taken into account. Select features of films important for atomic trap creation have been studied experimentally and the supposed traps concept provided.

On the Selection of Bezier Points in Bezier Curve Smoothing

  • Kim, Choongrak;Park, Jin-Hee
    • The Korean Journal of Applied Statistics
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    • v.25 no.6
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    • pp.1049-1058
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    • 2012
  • Nonparametric methods are often used as an alternative to parametric methods to estimate density function and regression function. In this paper we consider improved methods to select the Bezier points in Bezier curve smoothing that is shown to have the same asymptotic properties as the kernel methods. We show that the proposed methods are better than the existing methods through numerical studies.

Shock Waves in and around Protoclusters at Cosmic Noon in the Horizon Run 5 Simulation

  • Ji, Hannah;Hong, Sungwook E.;Koo, Hyeonmo
    • The Bulletin of The Korean Astronomical Society
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    • v.44 no.2
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    • pp.66.1-66.1
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    • 2019
  • We study cosmological shock waves in and around protoclusters at cosmic noon in the Horizon Run 5 Simulation (HR5), one of the world's largest hydrodynamic cosmological simulations. We select the local peaks of X-ray luminosity at z=2.5-3 in the HR5 lightcone volume as protocluster candidates. We find shock waves with Ms > 1.3 within the virial radii of the HR5 protocluster candidates by applying several shock-finding algorithms based on the Rankine-Hugoniot jump condition. We compare the properties of shock waves from different shock-finding algorithms.

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Consumer's Sensory Evaluation and Needs of Interior Fabrics for Seat Cover (시트커버용 인테리어 직물의 감성평가와 소비자 요구도)

  • Kim, Jeong-Hwa;Lee, Sun-Young;Lee, Jung-Soon
    • Korean Journal of Human Ecology
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    • v.18 no.3
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    • pp.749-756
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    • 2009
  • Keeping abreast with the latest consumer's trends, industries are focusing on sensibility aspects of products to meet consumer's needs. The car(?) seat cover fabrics are more closely related to human senses than anything else. This study attempted to investigate which seat cover fabric can give good feeling to consumers and to analyze their characteristics. Twelve kinds of jacquard fabric used for seat cover were selected. The Kawabata Evaluation System was used to measure the mechanical properties of 12 jacquard fabrics, and tactile sensibility(TS), and preference(P) determined by subjective evaluation of 160 participants were also utilized. The stepwise regression analysis was made to select the most significant mechanical properties, and some models for predicting tactile sensibility and preference was developed. The results are briefly summarized as follows: the most important parameter to choose seat cover fabric is a "hygienic property" and the other parameters are 'materials with color fastness', 'compressive property', 'color', 'antibacterial property', 'easy-care property'. The LogSMD, LogB, LC, EM were selected as significant mechanical properties affecting tactile sensibility. Also, the LC, LogB, LogSMD, LogWC, LogMMD were selected as significant mechanical properties affecting preference.

The Comparative Analysis on the Change of People's Outdoor Space Preference according to Time Difference in Multi-Family Housing using a Conjoint Analysis (컨조인트 분석기법을 이용한 공동주택 옥외공간의 선호도 변화 비교 분석)

  • Hwang, Kyu-Sung;Lee, Chan-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.11
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    • pp.4907-4913
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    • 2011
  • The purpose of this study is to find how the preferred properties of potential users for the outdoor space of the multi-family housing complex had changed according to time differance and to select the target market through market segmentation. The study has identified that the most important property among four properties had been changed from a Communication to a Amenity according to time difference. This is shown that considering information and communication as an important properties had been changed to regarding leisure and culture facilities as valuable properties.

A Study on Influence of Stroke Element Properties to find Hangul Typeface Similarity (한글 글꼴 유사성 판단을 위한 획 요소 속성의 영향력 분석)

  • Park, Dong-Yeon;Jeon, Ja-Yeon;Lim, Seo-Young;Lim, Soon-Bum
    • Journal of Korea Multimedia Society
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    • v.23 no.12
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    • pp.1552-1564
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    • 2020
  • As various styles of fonts were used, there were problems such as output errors due to uninstalled fonts and difficulty in font recognition. To solve these problems, research on font recognition and recommendation were actively conducted. However, Hangul font research remains at the basic level. Therefore, in order to automate the comparison on Hangul font similarity in the future, we analyze the influence of each stroke element property. First, we select seven representative properties based on Hangul stroke shape elements. Second, we design a calculation model to compare similarity between fonts. Third, we analyze the effect of each stroke element through the cosine similarity between the user's evaluation and the results of the model. As a result, there was no significant difference in the individual effect of each representative property. Also, the more accurate similarity comparison was possible when many representative properties were used.

Superconducting properties of MgB2 bulks using the different sizes of Mg & B raw powders

  • Chung, K.C.;Jang, S.H.;Oh, Y.S.;Kang, S.H.;Hwang, D.Y.
    • Progress in Superconductivity and Cryogenics
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    • v.22 no.4
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    • pp.20-23
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    • 2020
  • Among many variables in processing the high performance MgB2 bulk superconductors, simple and important approach is to optimize the size dependence of the Mg & B raw powders. The present study is dedicated towards the variation in superconducting properties of MgB2 depending upon the various combination of Mg & B powders with the two different particle sizes respectively. From morphological investigation of the MgB2 samples, narrow and long pores are observed when the larger Mg powders are used, whereas it is rather like the oval shapes with the smaller Mg powders. Also, it can be seen that the connectivity of the MgB2 samples is much enhanced with the smaller size of the B powders. Jc-H properties of the MgB2 samples also indicate that the highest Jc can be obtained when using the smaller size of the B powder with the combination of the smaller Mg powders than that of the larger Mg powders. If the cases with the larger B powers, it is more favorable to select the larger Mg powders with the better Jc-H properties considering shorter diffusion length of Mg and more homogeneous mixture between the Mg & B powders.

A Study on the Prediction of Transport Properties of Hydrocarbon Aviation Fuels Using the Methane-based TRAPP Method (Methane-based TRAPP method를 이용한 탄화수소 항공유의 전달 물성치 예측 연구)

  • Hwang, Sung-rok;Lee, Hyung Ju
    • Journal of ILASS-Korea
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    • v.27 no.2
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    • pp.66-76
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    • 2022
  • This study presents a prediction methodology of transport properties using the methane-based TRAPP (m-TRAPP) method in a wide range of temperature and pressure conditions including both subcritical and supercritical regions, in order to obtain thermo-physical properties for hydrocarbon aviation fuels and their products resulting from endothermic reactions. The viscosity and thermal conductivity are predicted in the temperature range from 300 to 1000 K and the pressure from 0.1 to 5.0 MPa, which includes all of the liquid, gas, and the supercitical regions of representative hydrocarbon fuels. The predicted values are compared with those data obtained from the NIST database. It was demonstrated that the m-TRAPP method can give reasonable predictions of both viscosity and thermal conductivity in the wide range of temperature and pressure conditions studied in this paper. However, there still exists large discrepancy between the current data and established values by NIST, especially for the liquid phase. Compared to the thermal conductivity predictions, the calculated viscosities are in better agreement with the NIST database. In order to consider a wide range of conditions, it is suggested to select an appropriate method through further comparison with another improved prediction methodologies of transport properties.

Estimating Hydraulic Properties of Soil from Constriction-pore Size Distribution (수축공극크기분포를 이용한 지반의 수리학적 물성치 산정)

  • Shin, Hosung
    • Journal of the Korean Geotechnical Society
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    • v.38 no.3
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    • pp.27-34
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    • 2022
  • Since water flow in the ground depends on the pore structure composed of soil grains, equations to predict the hydraulic properties based on the grain size have low accuracy. This paper presents a methodology to compute constriction-pore size distribution by Silveria's method and estimate saturated and unsaturated hydraulic properties of soils. Well-graded soil shows a uni-modal pore size distribution, and poor-graded soil does a bimodal distribution. Among theoretical models for saturated hydraulic conductivity using pore size distribution, Marshall model is well-matched with experimental results. Model formulas for soil-water characteristic curves and unsaturated hydraulic conductivity using the pore size distribution are proposed for hydraulic analysis of unsaturated soil. Continuous research is needed to select a model suitable to estimate hydraulic properties by applying the developed model formulas to various soils.