• 제목/요약/키워드: Standardized Terms

검색결과 357건 처리시간 0.031초

철도노반 보수용 토목섬유 콘테이너의 정적 거동특성 분석 (Static Behavior of Geotextile Container for Urgent Restoration of Rail Roadbed)

  • 신은철;고태훈;조인휘;이준철
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2003년도 추계학술대회 논문집(II)
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    • pp.79-84
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    • 2003
  • Utilizing of the geotextile container shows several advantages such as standardized construction, factory manufactured products, the control of quality, workability, and economical point of view. Recently this technique can be applied to rehabilitate the loss of rail roadbed due to the heavy rainfall. In this study, a large-scale laboratory test were conducted with simulation of static performance on the geotextile container reinforced rail roadbed. Based on the laboratory test results, the vertical pressure distribution with respect to the depth, and settlement of rail roadbed were measured and compared test results between geotextile container reinforced case and unreinforced case. Thus, the effectiveness of reinforcement was evaluated in terms of its performance and stability.

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반복하중을 받는 철도노반보수용 샌드백의 거동분석 (Behavior of Sand Bag for Maintenance Railroad Bed Subjected to Cyclic Loading)

  • 신은철;황선근;이동현;류인기
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2004년도 춘계학술대회 논문집
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    • pp.1033-1040
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    • 2004
  • Utilizing of the geotextile container shows several advantages such as standardized construction, factory manufactured products, the control of quality, workability. and economical point of view. Recently this technique can be applied to rehabilitate the loss of rail roadbed due to the heavy rainfall. In this study, a large-scale laboratory test were conducted with simulation of static performance on the geotextile container reinforced rail roadbed. Based on the laboratory test results, the vertical pressure distribution with respect to the depth, and settlement of rail roadbed were measured and compared test results between geotextile container reinforced case and unrein forced case. Thus, the effectiveness of reinforcement was evaluated in terms of its performance and stability.

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The Current State, Outcome and Vision of Additive Manufacturing

  • Terner, Mathieu
    • Journal of Welding and Joining
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    • 제33권6호
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    • pp.1-5
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    • 2015
  • Additive Manufacturing defines the fabrication of objects by successive consolidation of materials, layer by layer, according to a three-dimensional design. The numerous technologies available today were recently standardized into seven categories based on the general method. Each technology has its own set of advantages and limitations. Though it very much depends on the field of application, major assets of additive manufacturing compared to conventional processing routes are the ability to readily offer complexity (in terms of intricate shape and customization) and significant reduction of waste. On the other hand, additive manufacturing often suffers of relatively low production rates. Anyhow, additive manufacturing technologies is being given outstanding attention. In particular, metal additive manufacturing emerges as of great significance in industries like aerospace, automotive and tooling. The trend progresses toward full production of high value finished products.

A Certificate Revocation List Distribution Scheme over the eMBMS for Vehicular Networks

  • Kim, Hyun-Gon
    • 한국컴퓨터정보학회논문지
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    • 제21권10호
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    • pp.77-83
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    • 2016
  • To verify the trustworthiness of messages, public key certificates and certificate revocation list(CRL) has been standardized for vehicular networks. However, timely distribution of large CRLs to vehicles should be more elaborated with low bandwidth utilization from a practical point of view. To address this concern, we propose a CRL distribution scheme using long term evolution(LTE) point-to-multicast transmission, namely the enhanced multimedia broadcast multicast service(eMBMS). The schem is much more resource efficient than the existing unicast CRL distribution schemes for vehicular networks and it allows realizing the regional CRL distribution schemes efficiently in LTE network. By means of ns-3 simulation, we analyze the performance, latency, and execution time of the scheme in terms of varying coverage of the multimedia broadcast multicast service over single frequency network (MBFSN).

수치지형도 제작과정의 품질관리요소 정립에 관한 연구 (Establishment of Quality Checking Factors for Construction Process of Digital Topographic Map)

  • 최병길;김감래;문용현
    • 한국지형공간정보학회:학술대회논문집
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    • 한국지형공간정보학회 2005년도 아시아 태평양 국제 GSIS 학술발표회
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    • pp.73-83
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    • 2005
  • 본 연구의 목적은 수치지형도 제작과정의 품질관리 방법을 정립하는데 있다. 이를 위하여 총 17개의 국내 공간데이터 품질관련 법규 및 국내 주요 항측업체를 대상으로 작업순서, 사용장비, 작업 결과물의 정확도를 중심으로 조사, 분석하였다. 조사, 분석한 내용을 기반으로 '항공사진을 이용한 수치 지도 신규제작', '수치지도 수정제작', '기존 지도의 수치화' 공정으로 표준화하였으며, 공정별로 생성되는 공간데이터의 품질을 체크할 수 있는 요소들을 정립하였다.

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공간데이터 제작과정의 품질관리방법 정립에 관한 연구 (The Establishment of the Quality Management Method for Spatial Data Construction Process)

  • 최병길;조광희;이광원
    • 대한공간정보학회지
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    • 제13권3호
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    • pp.3-13
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    • 2005
  • 본 연구의 목적은 공간데이터 제작과정의 품질관리방법을 정립하는데 있다. 이를 위하여 총 17개의 국내 공간데이터 품질관련 법규 및 주요 항측 업체를 대상으로 작업순서, 사용장비, 작업 전후의 결과물의 정확도를 중심으로 조사, 분석하였다. 조사, 분석한 내용을 기반으로 공간데이터의 구축공정을 '항공사진을 이용한 수치지도 신규제작', '기존 수치지도 수정제작', '수치표고모델 구축', '영상지도제작'에 의한 공간데이터 구축 공정을 표준화하였으며, 공정별로 생성되는 공간데이터의 품질을 체크할 수 있는 요소들을 정립하였다.

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전자상거래를 활용한 국내 농산물 유통정보 구축에 관한 연구 - Business To Business 모델을 중심으로 - (Developing an Electronic Commerce Architecture for Agricultural Product - A Business To Business model -)

  • 박주석;변성욱
    • 한국전자거래학회지
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    • 제5권1호
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    • pp.75-91
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    • 2000
  • The new paradigm, which is called Electronic Commerce (EC), has greatly influenced not only enterprises but also other part of our society. Many goods have been actively transacted through EC all over the world. But there is a great difference between agricultural products and industrial products in terms of selling and buying behavior. Industrial products are well standardized and time-invariant in quality but agricultural products are not. Even the domestic distribution channels of agricultural products are much complex and are not modernized with internet technology. In this study, we first identify the behaviors of electronically transacting agricultural products and then develop and EC architecture far agricultural products in Korea. We suggest that EC for agricultural products focuses on B2B (Business to Business) model and various agricultural information should be distributed from B2B market over all supply chain and demand chain channels.

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A Novel Certificate Revocation List Distribution for Vehicle Communications in Mobile Communication Networks

  • Dan, Du Anh;Kim, Hyun-Gon
    • 한국컴퓨터정보학회논문지
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    • 제22권12호
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    • pp.109-116
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    • 2017
  • Short-lived pseudonym certificates as vehicle identities could satisfy both security and privacy requirements. However, to remove revoked certificates especially in vehicle communications, pseudonym certificate revocation list (CRL) should be distributed resource-efficiently from a practical deployment point of view and in a timely manner. In this paper, we propose a novel CRL distribution scheme capable of CRL multicast to only activated vehicles registered to the CRL multicast group using the group communication system enabler, namely, the GCSE which is being standardized. The scheme is resource efficient by using CRL distribution paths instead of paging processes to find out multicast vehicle(s) within a certain region. The analyzed results show that the proposed scheme outperforms in terms of paging cost, packets transmission cost, and the processing cost at the respective entities compared to the existing four schemes in the literature.

런규칙을 사용한 개량된 경계선 수정계획의 설계 (Design of the Modified Bounded Adjustment Scheme with Run Rules)

  • 박창순;정윤준
    • 품질경영학회지
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    • 제32권1호
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    • pp.144-154
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    • 2004
  • The bounded adjustment is known to be more efficient than repeated adjustment when the cost is incurred for engineering process control. The procedure of the bounded adjustment is to adjust the process when the one-step predicted deviation exceeds the adjustment limit by the amount of the prediction. In this paper, two run rules are proposed and studied In order to improve the efficiency of the traditional bounded adjustment procedure. The efficiency is studied in terms of the standardized cost through Monte Carlo simulation when the procedure is operated with and without the run rules. The adjustment procedure operated with run rules turns out to be more robust for changes in the process and cost parameters.

BVRI Filter Standardization of DOAO 1m Telescope

  • Ahn, Hojae;Pak, Soojong;Kang, Wonseok;Kim, Taewoo
    • 천문학회보
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    • 제42권1호
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    • pp.58.1-58.1
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    • 2017
  • National Youth Space Center has recently founded the Deokheung Optical Astronomy Observatory (DOAO) 1m Telescope, which accepts community observing applications since 2016. Standardization and calibration of the new observing facility are essential for astronomical research. In this poster, we present standardization processes and preliminary results for photometry of the Johnson-Cousins BVRI filter system. We selected sample data from a night in stable weather condition. After bias, dark, and flat corrections and photometry using ccdred and daophot package of IRAF, we derived standardized band pass parameters including color terms. The corrected photometry results of the BVRI filter system show reduced deviations from the standard magnitudes in the literature. In addition, we calculated atmospheric extinction coefficients and limiting magnitudes of the telescope system. We plan to extend these standardizing processes to flux calibration of narrow band filters, e.g. $H{\alpha}$ filter.

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