• 제목/요약/키워드: material standardization

검색결과 233건 처리시간 0.025초

환경준위 알파입자측정을 위한 다중선 비례계수기 개발(I) (Development of Multiwire Proportional Counter for Measurement of Environmental-level Alpha Particles)

  • 오필제;박태순;이민기;김경화
    • 분석과학
    • /
    • 제9권3호
    • /
    • pp.262-269
    • /
    • 1996
  • 저준위 및 환경준위의 알파입자 방출핵종의 방사능을 측정하기 위한 다중선 비례계수기를 개발하였다. 비례계수기의 외부 크기는 $350{\times}290{\times}30mm$이고, 측정이 가능한 측정선원의 최대 면적은 $250{\times}200mm$이다. 비례계수기의 재질은 최소의 background와 외부충격에 의한 형태변형을 방지하기 위해 스테인리스 스틸을 사용하였고, 양극선 및 음극선의 재질은 직경 $50{\mu}m$의 스테인리스 스틸 wire로서, 전체 전극선의 수는 각각 21개와 42개이다. 계수효율을 최대로 하고 검출기벽에 의한 흡수효과를 제거하기 위해서 측정선원은 검출기 내부에 위치하도록 하였으며, 선원두께에 의한 효율변화를 방지하기 위하여 선원 높이를 10mm까지 조절할 수 있도록 설계하였다. 제작된 검출기는 plateau, 작동전압, background, 계수효율, 선원위치에 따른 감도, 에너지분해능 등의 특성조사를 수행하였다. $^{241}Am$ 핵종의 경우, 시료 1L를 처리하여 50,000초를 측정하였을 때의 LLD(Lower Limit of Detection)는 5.0 mBq/L로 산출되어 ISO(International Organization for Standardization)에서 규정하고 있는 환경준위의 알파업자 측정용 장치의 LLD인 40mBq/L 보다 낮은 방사능을 분석할 수 있는 양호한 환경방사능 측정장치인 것으로 판명되었다.

  • PDF

점착유연형 고무아스팔트계 씰재의 한중 공동 품질관리 규정 개발을 위한 제품 및 기술기준 현황 조사 (Investigation on Products and Regulation of Flexible Adhesive Rubber Asphalt Type Sealant for the Development of Korea-China Joint Standard)

  • 안기원;김동범;최수영;하행양;오상근
    • 한국건설순환자원학회논문집
    • /
    • 제7권4호
    • /
    • pp.323-332
    • /
    • 2019
  • 건설 방수재로 사용되는 고무아스팔트 씰재에 대한 한국 및 중국의 공동 품질관리 규정 제정을 위해 양국의 재료 및 품질기준 현황을 조사하고, 향후 방향을 제시한 연구다. 고무아스팔트 씰재에 대한 한중 무역교류가 추진되고 있 있으나, 국가 간에 제시된 품질기준이 달라 제품에 대한 품질 검증의 어려움이 있고, 이를 해소하기 위해 양국의 현황을 파악하여 공동 품질관리 규정 제정의 필요성을 제시하였다 .한국과 중국의 고무아스팔트 씰재에 대한 구성 재료 비교, 품질관리 기준(성능평가 항목)의 비교 결과, 구성 재료에 있어서 방수 성능을 발현하는 주성분 원료인 "아스팔트와 고무"의 사용 비율에 차이가 있고, 부원료(충전제, 증점제, 접착제 등)의 사용 소재 종류도 다르게 나타났으며, 성능평가 항목에 있어서도 양국의 요구 성능 항목이 크게 다르다는 것을 파악되었다. 이러한 문제을 해소하기 위하여 일반적으로 ISO(국제표준기구 : International Organization for Standardization)에서 제시한 표준 기준을 활용하는 등의 대안이 있으나 고무 아스팔트 씰재에 대한 방수재 ISO 표준은 전무하며, 한중간 무역 교류를 위하여 ISO 규격을 제정하기에는 소모되는 시간이나 비용에 따른 경제적 여건이 불합리한 상황이다. 이에 본 연구에서는 한중 양국 간에 공동으로 적용할 수 있는 품질규격을 제정하여 상호 무역 교류 시 이를 적용함으로써 제품에 대한 물성파악이 용이한 국제공동규격 제정을 위한 성능평가 요소로써 주요 성능 항목으로 "화학저항성능, 투수저항성능, 온도안정성능, 습윤면 부착성능"을, 부가 성능 항목으로 "균열 거동 대응성능", "점도", "고형분" 등 7가지 항목을 제시하였다.

IT 및 전자제품에 적용되는 알루미늄 합금소재의 표면처리디자인에 관한 연구 (Study on surface processing design of aluminum alloy materials that is applied to IT and electronics)

  • 한지수;김푸름;김현성
    • 한국결정성장학회지
    • /
    • 제27권4호
    • /
    • pp.212-219
    • /
    • 2017
  • 앞으로 다가올 감성이 지배하는 '하이터치(High-Touch)'의 시대에 걸맞은 사람이 되기 위해서는 6가지 능력이 중시되는데 디자인, 스토리, 조화, 공감, 놀이, 의미가 있으며 이 중에서 디자인과의 조화를 가장 중요한 능력으로 꼽았다. 모든 비즈니스의 기본요소라고 볼 수 있는 디자인은 논리적이고 객관화된 정보와 지식을 바탕으로 만들어진 현대의 디자인 관으로는 직관적이고 감성적인 앞으로의 시대 흐름에 발맞추기 힘들 것이다. 본 논문은 1차적 관점의 디자인 소재 중요성과 함께 심도 있는 Color, Material, Finishing(CMF) 이해와 차별화 전략을 세워 소비자가 느끼는 감성인지요소와 제품의 표면처리디자인 적용을 통한 대품질, 매력품질, 감동품질을 만족시키는 감성 표면처리디자인의 체계화 및 표준화를 제시하였다. 제품에 적용되어지는 부품 유형별 CMF 차별화 전략 방향 설정에 따라 구현가능성 차별성 신표면처리특성 효율성을 고려하여 시각적 표면처리 샘플로 구현하였다. 이를 통해 향후 실질적으로 제품 개발 시 IT 및 전자제품 분야와 그 이상의 분야에서 디자이너, CMF 디자이너, 표면처리전문가, 엔지니어 등 실무 환경에서의 대상제품, 부품유형, 적용소재, 적용표면처리, 표면컬러, 표면질감, 구현하고자하는 느낌 등 통합적 요소들을 이해하고 공유할 수 있는 실무자 소통연계 툴 및 감성 표면처리디자인 전략적 접근 프레임워크로서의 활용이 예상되는 바이다.

종이 의상에 관한 연구 - 수제지를 중심으로 - (A Study on the Paper Clothing -on the basis of handmade paper-)

  • 이주실;김정혜
    • 복식
    • /
    • 제44권
    • /
    • pp.181-199
    • /
    • 1999
  • The industry of modern clothing has deviated from the overflow of commercialism and the standardization and nowadays is going toward pursuing art, creativity, and high added value. This trend brings the return of the natural materials from the synthetic textiles and increases the value of old and handmade fabrics. Finally, the handmade-paper, which is a natural material, comes to be reconsidered as a new material for the clothing. Therefore, as the natural materials and the manufacture of handmade clothing are rising again, the qualitative improvement and globalization of clothing industry should be first realized through the developments of creative and various clothing materials and new expressing techniques. The above investigation and study have been synthesized and analyzed as follows: First, through the study on the origin of the paper clothing, its historical background and the process of its development, we've learned these two facts following : the paper clothing of the East in the past mostly had practiced meanings. On the other hand, in the West it had meanings which were raised the artist's emotions and beauty-consciousness to the artistic level by the various kinds of expressing methods. Second, handmade-paper was manufactured by the embedding method, which mixed mulberry pulp, gauze, corn, hair, sisal, silk and so on. It was found that handmade-paper had the affluent and proper texture as the clothing material and was be able to control the clarity through the variation of thickness. It was also confirmed that the creative and original texture with hand-worked molding beauty was obtained by the use of handmade-paper. Third, when the handmade-paper is used, the molding beauty of plane, relievo, and solid can be freely pursued, and various and effective molding conformation can be constructed by the effect of superposition and repetition. Also, because the maximum discretion from the various optional manufacturing methods is allowed, the molding beauty can be maximized when the clothes are manufactured with handmade-paper. Fourth, the gauze with strong drape was combined to overcome the stiffness and the tearing of the paper. As a result, the durability and the wearability of the paper were strengthened and thus the thus the applications as the clothing material were enlarged. In conclusion, in order to enhance the value, creativity, practicality, and artistic sense of the design for modern clothing, the clothes made of handmade-paper should be more studied. Moreover, for the generalization of paper clothes, the studies on the development of practical paper with paper with water resistance, post-treatment after dyeing, flexibility, and durability should be done. I really hope that this study will be the motive to provoke the possibility of handmade-paper as new clothing material in not only practical sense but also artistic sense.

  • PDF

A Three-dimensional Biomechanical Model for Numerical Simulation of Dynamic Pressure Functional Performances of Graduated Compression Stocking (GCS)

  • Liu, Rong;Kwok, Yi-Lin;Li, Yi;Lao, Terence-T;Zhang, Xin;Dai, Xiao-Qun
    • Fibers and Polymers
    • /
    • 제7권4호
    • /
    • pp.389-397
    • /
    • 2006
  • The beneficial effects of graduated compression stockings (GCS) in prophylaxis and treatment of venous disorders of human lower extremity have been recognized. However, their pressure functional performances are variable and unstable in practical applications, and the exact mechanisms of action remain controversial. Direct surface pressure measurements and indirect material properties testing are not enough for fully understanding the interaction between stocking and leg. A three dimensional (3D) biomechanical mathematical model for numerically simulating the interaction between leg and GCS in dynamic wear was developed based on the actual geometry of the female leg obtained from 3D reconstruction of MR images and the real size and mechanical properties of the compression stocking prototype. The biomechanical solid leg model consists of bones and soft tissues, and an orthotropic shell model is built for the stocking hose. The dynamic putting-on process is simulated by defining the contact of finite relative sliding between the two objects. The surface pressure magnitude and distribution along the different height levels of the leg and stress profiles of stockings were simulated. As well, their dynamic alterations with time processing were quantitatively analyzed. Through validation, the simulated results showed a reasonable agreement with the experimental measurements, and the simulated pressure gradient distribution from the ankle to the thigh (100:67:30) accorded with the advised criterion by the European committee for standardization. The developed model can be used to predict and visualize the dynamic pressure and stress performances exerted by compression stocking in wear, and to optimize the material mechanical properties in stocking design, thus, helping us understand mechanisms of compression action and improving medical functions of GCS.

국내 MSDS 등 화학물질정보의 제공실태와 DB관리 개선방안 연구 (A study on the supply status of chemical substance information including MSDS and a way of improving Database management in Korea)

  • 이권섭;윤석준;최재욱;김현옥;이종한;양정선
    • 한국산업보건학회지
    • /
    • 제17권1호
    • /
    • pp.63-70
    • /
    • 2007
  • This study investigated the current management staus of chemical substance information on Material Safety Data Sheets(MSDS) and Chemical Information Cards(CIC) provided by Korea Occupational Safety & Health Agency(KOSHA) and also researched the kind and the characteristics of chemical substance information provided in other organizations. MSDS DB in Korean provided on KOSHANET(which is Kosha website) is 50,802 in total, among whom are single chemical substances with 31,870 kinds(18,932%) and are mixed chemical substances with 31,870 kinds(62.7%). The number of visiting MSDS DB on KOSHANET for the search of chemicals was 2,049,806. The number has increased each year. The CIC provided for workplaces is all 542 kinds : 14 harmful substances subject to permission, 168 harmful substances subject to management, 360 KOEL(Korean Occupational Exposure Limits) establishment substances. MSDS internationally provided by organizations producing MSDS DB was written with 16 sections, which is suitable for the writing basis of American Standards Institute(ANSI) and International Organization for Standardization(ISO) and provided chemical substance information on more than 100,000 kinds in most organizations.

광주.전남지역 수의에 관한 실태 조사 (A Study on the Shroud around Kwanju and Chonnam Area)

  • 임린;김용서
    • 복식
    • /
    • 제51권2호
    • /
    • pp.93-103
    • /
    • 2001
  • This Study shows local characters, meaning, value and others (kind, function, material, shape, name) on Shroud through documents and fact-finding survey. In Shroud′s kind and function, Shroud of Kwangju Area is similar with one of Youngsan-river Area, while Sumjin-river Area and Coastal Area, each has its own character due to difference of Burial Culture. In Shroud′s Material, hemp cloth, white cotton cloth and calico, have been well-used in Kwangju and Youngsan-river Area, while silk has used in Sumjin-river and Coastal Area. Shroud′s color has followed Natural color. In Shroud′s shape, Male Jeoksam, Female Trousers, Um, Myokmok, Aksoo, Bib have their local characters. They are reformed in Kwangju Area and Youngsan-river Area. Jeoksam in Coastal Area, Female Trousers in Sumjin-river Area. Um in Coastal Area and Myokmok in Sumjin-river Area, have its unique character. In Shroud′s name, Shroud has widely been called "Dead Clothes", and called "Blind Clothes", "Munnyung Clothes" some areas. In Sumjin-river Area, Summer Jacket has been failed "Deungjigae", Dango called "Ddangjungwee". In Coastal Area, Myokmok and Aksoo have been called "Face Cover" and "Hands Cover", Shroud′s local characters have been caused by Next World, which has reflected local natural environment and cultural features. Next World is so abstract that it can not be expressed well, while Reality is clearly divided into dual spaces : Real World, Next World. Comprehension on Next World, helps harmonize recent values with Shroud meaning and prevents Shroud from standardization and transformation.

  • PDF

수치지도 공급을 위한 국립지리원 외부메타데이터의 설계 (Designing External Metadata of National Geography Institute for Distributing Digital Maps)

  • 김계현;김희두;임삼성;이경숙;유승근
    • 한국공간정보시스템학회 논문지
    • /
    • 제1권1호
    • /
    • pp.89-98
    • /
    • 1999
  • 본 연구는 국립지리원 수치지도의 효율적인 관리와 공급을 위하여 외부메타데이터 설계를 목적으로 수행되었다. 보다 효율적이고 세계표준에 부합하는 메타데이터의 표준안을 제작하기 위하여 국외의 표준화 관련 기구의 동향 분석과 함께 선진국의 메타데이터 구축사례를 분석하였으며 이와 함께 국내의 구축사례를 조사하였다. 사용자의 요구를 최대한 수용하기 위하여 국립지리원의 메타데이터 관련 자료를 최대한 수집하여 실무자의 의견을 바탕으로 항목별로 분류를 하였으며, 데이터의 유형별 중요도를 부과하였다. 이러한 기존 자료의 분석을 바탕으로 외부메타데이터의 설계안을 도출하였으며 ISO의 표준안을 최대한 수용하는 표준메타데이터를 제시하였다. 설계된 메타데이터를 바탕으로 실무 적용에 따른 향후 지속적인 연구개발과 보완과 세계적인 표준화의 동향에 따른 메타데이터의 갱신이 필요시 된다.

  • PDF

원자력 발전 주기기 제작에 적용되는 용접공정 (Welding process for manufacturing of Nuclear power main components)

  • 정인철;김용재;심덕남
    • 대한용접접합학회:학술대회논문집
    • /
    • 대한용접접합학회 2010년도 춘계학술발표대회 초록집
    • /
    • pp.43-46
    • /
    • 2010
  • As the nuclear power plant has been constructed continuously for several decades in Korea, the welding technology for components manufacturing and installation has been improved largely. Standardization for weld test and qualification was also established systematically according to the concerned code. The welding for the main components requires the high reliability to keep the constant quality level, which means the repeatability of weld quality. Therefore the weld process qualified by thorough test and evaluation is able to be applied for manufacturing. Narrow gap SAW and GTAW process are usually applied for girth seam welding of pressure vessel like Reactor vessel, steam generator, and etc. For the surface cladding with stainless steel and Inconel material, strip welding process is mainly used. Inside cladding of nozzles is additionally applied with Hot wire GTAW and semi-auto welding process. Especially the weld joint having elliptical weld line on curved surface needs a specialized weld system which is automatically rotating with adjusting position of the head torch. The small sized pipe, tube, and internal parts of reactor vessel requests precise weld processes like an automatic GTAW and electron beam welding. Welding of dissimilar materials including Inconel690 material has high possibility of weld defects like a lack of fusion, various types of crack. To avoid these kinds of problem, optimum weld parameters and sequence should be set up through the many tests. As the life extension of nuclear power plant is general trend, weld technologies having higher reliability is required gradually. More development of specialized welding systems, weld part analysis and evaluation, and life prediction for main components should be taken into a consideration extensively.

  • PDF

Preliminary pharmacognostical and phytochemical evaluation of Stachys tibetica Vatke

  • Kumar, Dinesh;Bhat, Zulfiqar Ali;Kumar, Vijender;Chashoo, Ishtaq Ahmad;Khan, Nisar Ahmad;Ara, Irfat;Shah, Mohammad Yassin
    • 셀메드
    • /
    • 제2권1호
    • /
    • pp.11.1-11.7
    • /
    • 2012
  • Stachys tibetica Vatke (Lamiaceae) is an important medicinal plant in the folk medicine of Ladakh, India and Tibet for the treatment of various mental disorders. Infusion and decoction of the whole plant is used as a cup of tea for a severe fever, headaches and to relieve tension. The recent study is aimed to evaluate the preliminary pharmacognostical and phytochemical nature of Stachys tibetica Vatke. The whole plant material was subjected to successive soxhlet extraction with petroleum ether (40 - $60^{\circ}C$), chloroform, ethyl acetate, methanol and finally decocted with water to get the respective extracts. The fluorescence characteristics of the powdered materials were analysed under ultraviolet light and ordinary light. Different physicochemical parameters such as ash value, extractive value, foaming index, pH values, loss on drying and determination of foreign matter were carried out as per WHO guidelines. The total fat, flavonoid, saponin and volatile contents were also determined. Macroscopical studies revealed the authentication of the plant drug. Physicochemical parameters helped to standardize the plant material while preliminary qualitative chemical tests of different extracts showed the presence of Glycosides, Carbohydrates, Phytosterols/triterpenoids, Saponins, Fixed oils, Fats and phenols/tannins. Quantification of the total flavonoids and saponins and contents were determined as $54.66{\pm}0.58mg/g$ and $75.42{\pm}0.48mg/kg$ respectively, while the volatile and fat contents were 6.5% and 0.7% respectively. Results may lay the foundation for the standardization of the drug and discovery of new molecules from S. tibetica for the treatment of various diseases.