• Title/Summary/Keyword: HEI

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A Study on Tool Offset for Cutting of the Polyurethane Foam (폴리우레탄폼 절삭가공시 공구보정에 관한 연구)

  • Min, Se-Hong;Kim, Hei-Song
    • Journal of the Korean Society of Safety
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    • v.15 no.2
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    • pp.31-35
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    • 2000
  • After constructing master model utilizing CAD data originated by sketch, product NC data for polyurethane foam using digitized master model data. And model cutting is performed utilizing specially developed polyurethane foam cutting tool in machining center. In this study, it is discussed to construct concept of tool offset, method of tool offset and feature tolerance, etc., that is impossible for cutting of the polyurethane foam by CNC machine.

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ON CLASS ALGEBRAS

  • Choi, Eun-Mi;Lee, Hei-Sook
    • Journal of the Korean Mathematical Society
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    • v.40 no.2
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    • pp.273-286
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    • 2003
  • Let $F^{\alpha}$G be a twisted group algebra. A subalgebra of $F^{\alpha}$G generated by all class sums of partition P of G is called a projective class algebra in $F^{alpha}$G associated with partition P. In this paper we study various partitions of G determined by actions of certain operator groups on G and construct projective class algebras depending on the actions. With regard to projective class algebras, we investigate structures of associated skew group algebras and fixed group algebras.

A Conceptual Design of Information Management Model of Ordering Service Results including Management Item by Construction Fields (건설분야별 관리항목을 포함하는 용역실적정보 관리모델의 개념적 설계)

  • Kim, seong-jin;Kim, nam-gon;Na, hei-suk
    • Proceedings of the Korea Contents Association Conference
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    • 2013.05a
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    • pp.447-448
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    • 2013
  • 본 연구는 발주청에서 발주 관리되는 설계, 감리, 건설사업관리 용역실적정보를 건설분야별 사업단계별로 관리체계를 마련하고 용역사와 발주청에서 용역실적정보를 체계적으로 등록 관리할 수 있도록 업무처리 프로세스를 개선하고자 한다.

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A Study on the Development of the Safety Management System on Construction Sites in the Cloud Computing Environments (클라우드 컴퓨팅 환경에서의 건설현장 안전관리시스템 개발 방안 연구)

  • Jeong, Seong Yun;Kim, Byung Kon;Choi, Won Sik;Na, Hei Suk
    • Proceedings of the Korea Contents Association Conference
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    • 2012.05a
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    • pp.417-418
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    • 2012
  • 최근 국내외적으로 관심이 높은 클라우드 컴퓨팅기반으로 안전사고 예방 대응과 관제 모니터링시스템과 안전관리업무를 지원하는 시스템을 개발하기 위한 방안을 제시하였다.

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Class E Amplifier in Push-Pull Configuration

  • Ma, Sui-Wah;Yam, Yu-On;Wong, Hei
    • Proceedings of the IEEK Conference
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    • 2000.07b
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    • pp.941-944
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    • 2000
  • This paper proposes, for the first time, the design of class I pull-push power amplifier. With the new design, the output power is increased by four times when compared to conventional single-end class I connection amplifier with the same supply voltage. The performance of the proposed amplifier is verified by with a 100-kHz power amplifier constructed using general-purpose NPN transistors.

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MODULES OF QUOTIENTS OVER COMMUTATIVE RINGS

  • Lee, Hei-Sook
    • Communications of the Korean Mathematical Society
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    • v.9 no.4
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    • pp.797-801
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    • 1994
  • In [3] Goldman introduced the notion of modules of quotients of a ring with respect to an idempotents kernel functor, which is a generalization of the localization of a module with respect to a multiplicative subset of a communtative ring. For an idempotent kernel functor $\sigma$ on the category of R-modules and for an R-module M, let $Q_\sigma(M)$ denote the module of quotients with respect to $\sigma$.

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