• Title/Summary/Keyword: Alternative Material

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A Study on the Change of Production Strategy and Environment for Alternative Material for Person with Special Needs (장애인용 대체자료 제작 전략 및 환경 변화에 관한 연구)

  • Kang, Seong-goo;Lim, Kyoung-won
    • Journal of Korean Library and Information Science Society
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    • v.48 no.4
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    • pp.283-301
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    • 2017
  • Recently, an integrated electronic publishing format that can be used by disabled people and the general public is expected. If applied to national alternative material production strategy, it is expected that not only the problem of alternative material production strategy using existing DTD(Document Type Definition) but also various alternative material corresponding to the demand of consumer can be supplied. In order to cope with changes in the production and management strategy of the substitute materials for the rapidly changing persons with disabilities, it is necessary to develop the substitute materials related to the substitute materials, such as 'production of alternative materials', 'research and education of alternative material', and 'operation of alternative material network' The organization of the National Library for the Disabled should be expanded and reorganized so that a constructed center can be established and demonstrated its expertise.

Study on the Mechanical Property of Turbopump Material (터보펌프 소재의 기계적 물성치 검토에 관한 연구)

  • Lee, Kwan-Ho;Jeon, Seong-Min;Kim, Jin-Han
    • 유체기계공업학회:학술대회논문집
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    • 2003.12a
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    • pp.346-352
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    • 2003
  • The study was performed to search on alternative material for turbopump parts made of Russian material by analyzing and comparing chemical and mechanical material properties. Iron base material was generally used for turbopump. This material can be categorized into stainless steel and heat resisting steel by quantity of additional elements. Each steel was also classified into austenite steel, ferrite steel, and martensite steel. Alternative materials for turbopump inducer, impeller and casing are chosen by JIS SUS 631 and 321 as a result of this study. Because the material of Russian turbopump turbine may be developed by Russia itself, alternative material can be hardly found. However, Inconel 718 for turbine material is thought to be proper in the aspect of hardness considering general use of this material for turbopump turbine in Japan and France.

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Market and trend of alternative sweeteners (저칼로리 저감미도 대체감미료 시장 및 동향)

  • Kim, Yang Hee;Kim, Seong-Bo;Kim, Su Jin;Park, Seung-Won
    • Food Science and Industry
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    • v.49 no.3
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    • pp.17-28
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    • 2016
  • The concerns over obesity and obesity-related health problems are increasing as many consumers relate these health problems with sugar. The demand for sugar reduction is also rising and regulatory movement by governments including Korea is driven to reflect such demand. For the past decades, there have been diverse development and marketing of various sweeteners to substitute sucrose and high fructose corn syrup. Low caloric alternative sweeteners can be divided into high intensity sweeteners that have greater sweetness potency compared to sucrose, and low intensity sweeteners such as polyols, oligosaccharides and rare sugars that have less sweetness potency. This paper discusses representative low caloric alternative sweeteners, their market and trend.

Investigating Elementary Students에 Alternative Conceptions of Heat and Temperature (초등학생들의 열과 온도에 대한 대안개념 조사)

  • 최행숙;김은경;백성혜;이길재;정완호
    • Journal of Korean Elementary Science Education
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    • v.20 no.1
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    • pp.123-137
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    • 2001
  • In this study, the contents of elementary school science textbooks related to 'heat and temperature' are analyzed and alternative conceptions ofi"heat and temperature" among students enrolled in grades 4, 5 and 6 are investigated. 259 students were selected from a elementary school located in urban area. The relationships between students' alternative conceptions and the content of elementary science textbooks are also examined. Students' conceptions are analyzed from their answers to a paper-and-pencil test. The typical alternative conception of "heat and temperature" held by students was follows. They think that "heat" is a material and "temperature" is value of heat amount. They can't distinguish between "heat" and "temperature". Their explanation of "heat and temperature" is focused on hot or cool sensation and other observable characteristics of a material. A textbook analysis indicated that contents on "heat and temperature" were organized without the viewpoint of particle motion theory. This may be one of the causes of students' alternative conceptions.

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Design of the Curation Platform for User-participated Book Recommendation System of Selecting on Alternative Material for the Disabled (대체자료 선정을 위한 이용자 참여형 도서 추천 큐레이션 플랫폼 설계)

  • Cho, Hyun-Yang
    • Journal of the Korean Society for Library and Information Science
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    • v.54 no.3
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    • pp.41-69
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    • 2020
  • The purpose of this study is to design and develop a alternative material recommendation system using automatic classification, based on user preference. Details of usage data by users from DREAM was analysed in order to develop the way of a method on selecting proper alternative material, and then the data by user preference were allocated under each category of 10 KDC categories. The keyword, selected from the title of users' usage data from a certain period of time, were divided into 10 subject categories and ranked by the order of frequency of appearance. Books including high frequency of the keyword in title can be selected as a preferred target for producing alternative materials. Lastly, a dynamic linkage for sharing usage data among National Library for the Disabled and other libraries is proposed to produce more proper alternative materials, based on user preference.

An analytical study on unsteady thermal stresses of functionally graded materials (경사기능재료의 비정상 열응력에 관한 해석적 연구)

  • Choi, Deok-Kee;Kim, Chang-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.9
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    • pp.1441-1451
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    • 1997
  • This paper addresses method which can be used for analyzing thermal stresses of a functionally graded material(FGM) using semi-analytical approach. FGM is a nonhomogeneous material whose composition changes continuously from a metal surface to a ceramic surface. An infinite one dimensional FGM plate is considered. The temperature distribution in the FGM is obtained by approximate Green's function solution. To expedite the convergence of the solutions, alternative Green's function solution is derived and shows good agreement with results from finite difference method. Thermal stresses are calculated using temperature distribution of the plate.

A study on relaxation of thermal stresses of heat-resistant systems (열차단 시스템에 있어서의 열응력 완화에 대한 연구)

  • Choi, Deok-Kee;Kim, Chang-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.22 no.1
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    • pp.16-22
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    • 1998
  • This paper addresses a method which can be used for analyzing thermal stresses of a functionally graded material(FGM) using semi-analytical approach. FGM is a nonhomogeneous material whose composition is changed continuously from a metal surface to a ceramic surface. An infinite one dimensional FGM plate is considered. The temperature distribution in the FGM is obtained by approximate Green's function solution. To expedite the convergence of the solutions, alternative Green's function solution is derived and shows good agreement with results from finite difference method. Thermal stresses are calculated using temperature distribution of the plate.

A Study on the Applicability of Slag as Compaction Pile Material (다짐말뚝 채움재로서 슬래그의 적용성 연구)

  • 이미혜;이상익;박용원
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03b
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    • pp.207-214
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    • 2000
  • Sand Compaction Pile method is one of the widely used ground improvement techniques at loose sand or soft clay ground in Asian countries. However, due to environmental and economical problems concerning shortage of sand resources alternative materials are needed to substitute sand for SCP. This study is on the applicability of slag as an alternative material SCP. Consolidation and direct shear test are performed for the slag-clay composite specimens to find out the positive effects of consolidation rate and shear resistance of slag reinforced ground. The result shows that slag has similar effects with sand in consolidation and shear resistance behavior in composite ground, which says slag can be used as alternative material of sand for SCP.

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Abatement of Methane Production from Ruminants: Trends in the Manipulation of Rumen Fermentation

  • Kobayashi, Yasuo
    • Asian-Australasian Journal of Animal Sciences
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    • v.23 no.3
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    • pp.410-416
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    • 2010
  • Methane emitted from ruminant livestock is regarded as a loss of feed energy and also a contributor to global warming. Methane is synthesized in the rumen as one of the hydrogen sink products that are unavoidable for efficient succession of anaerobic microbial fermentation. Various attempts have been made to reduce methane emission, mainly through rumen microbial manipulation, by the use of agents including chemicals, antibiotics and natural products such as oils, fatty acids and plant extracts. A newer approach is the development of vaccines against methanogenic bacteria. While ionophore antibiotics have been widely used due to their efficacy and affordable prices, the use of alternative natural materials is becoming more attractive due to health concerns regarding antibiotics. An important feature of a natural material that constitutes a possible alternative methane inhibitor is that the material does not reduce feed intake or digestibility but does enhance propionate that is the major hydrogen sink alternative to methane. Some implications of these approaches, as well as an introduction to antibiotic-alternative natural materials and novel approaches, are provided.

Study on CO2 Emission Reduction Effects of Using Waste Cementitious Powder as an Alternative Raw Material

  • Park, Dong-Cheon;Kwon, Eun-Hee;Hwang, Jong-Uk;Ahn, Jae-Cheol
    • Journal of the Korea Institute of Building Construction
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    • v.14 no.2
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    • pp.187-194
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    • 2014
  • With environmental regulations continuously being strengthened internationally the need to control environmental pollution and environmental load is emerging in Korea. The purpose of this study is to seek methods or using waste cementitious powder as an alternative raw material for limestone through the optimization of raw material and to quantitatively analyze the resulting reduction of $CO_2$ emission in order to contribute to solving the issue of waste, which is the biggest issue in relation to construction and global warming. The results of the study, show that waste cementitious powder can be used as an alternative raw material for limestone at OPC level, but it was also found that mixing fine aggregate cementitious powder into waste cementitious powder significantly affected the substitution rate for limestone with waste cementitious powder and the reduction of greenhouse gas. In particular, when fine aggregate cementitious powder was used at a rate of 0~20%, the substitution rate for limestone and the reduction in the rate of greenhouse gas emission was significantly reduced. It is thought that a technique to efficiently separate and discharge the fine aggregate cementitious powder mixed in waste cementitious powder needs to be developed in the future.