• Title/Summary/Keyword: z-map

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A study of aerobic and anaerobic inducible genes using Mu dJ(Km lac) operon fusion in salmonella typhimurium (Salmonella typhimurium에서 Mu dJ(Km lac) operon fusion을 이용한 산소, 무산소 유도 유전자에 관한 연구)

  • 김종선;우영대;박종희;김영권;이인수;박용근
    • Korean Journal of Microbiology
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    • v.27 no.3
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    • pp.201-209
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    • 1989
  • Using Mu dJ(Km lac) operon fusion, several oxygen-regulated genetic loci were identified in Salmonella typhimurium. Nine aerobically inducible(oxi) and thirteen anaerobically inducible(ani) operon fusions were newly identified. Based on the control by oxrA regulatory locus, the ani-lacZ fusions were grouped into two classes: class I loci were regulated by oxrA regulatory locus; class II genes were not affected by this locus. Some of the ani-lacZ fusions had required growth in CAA and LB before they exhibited the inducible phinotype. Most of all ani-lacZ fusions were repressed by nitrate and fumarate. Three of the ani loci were mapped into $59{\pm}0.14$ map unit (YK114), $64{\pm}0.5$ map unit(YK120), and $93{\pm}0.29$ map unit(YK112) by testing the cotransduction frequency, respectively.

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Feature Recognition and Segmentation via Z-map in Reverse Engineering (역공학에서 Z-map을 이용한 특징형상 탐색 및 영역화)

  • 김재현;신양호;박정환;고태조;유우식
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.2
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    • pp.176-183
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    • 2003
  • The paper presents a feature recognition and segmentation method for surface approximation in reverse engineering. Efficient digitizing plays an important role in constructing a computational surface model from a physical part-surface without its CAD model on hand. Depending on its measuring source (e.g., touch probe or structured light), each digitizing method has its own strengths and weaknesses in terms of speed and accuracy. The final goal of the research focuses on an integration of two different digitizing methods: measuring by the structured light and that by the touch probe. Gathering bulk of digitized points (j.e., cloud-of-points) by use of a laser scanning system, we construct a coarse surface model directly from the cloud-of-points, followed by the segmentation process where we utilize the z-map filleting & differencing to trace out feature boundary curves. The feature boundary curves and the approximate surface model could be inputs to further digitizing by a scanning touch probe. Finally, more accurate measuring points within the boundary curves can be obtained to construct a finer surface model.

ON DYNAMICS OF A SIXTH-ORDER MULTIPLE-ROOT FINDER FOR NONLINEAR EQUATIONS

  • YOUNG HEE GEUM
    • Journal of applied mathematics & informatics
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    • v.42 no.1
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    • pp.213-221
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    • 2024
  • A family of sixth-order multiple-root solver have been developed and the special case of weight function is investigated. The dynamical analysis of selected iterative schemes with uniparametric polynomial weight function are studied using Möbius conjugacy map applied to the form ((z - A)(z - B))m and the stability surfaces of the strange fixed points for the conjugacy map are displayed. The numerical results are shown through various parameter spaces.

DEGREE OF THE GAUSS MAP ON AN ODD DIMENSIONAL MANIFOLD

  • Byun, Yang-Hyun
    • East Asian mathematical journal
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    • v.14 no.2
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    • pp.269-279
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    • 1998
  • For a codimension 1 submanifold in a Euclidean 2n-space, the degree of the gauss map mod 2 is the semi-characteristic of the manifold in $Z_2$ coefficient.

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Verification of Tool Collision for 3-Axis Milling (3축 밀링 가공의 공구 충돌 검증)

  • Chung, Yun-C.;Park, Jung-W.
    • Proceedings of the KSME Conference
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    • 2001.06c
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    • pp.116-121
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    • 2001
  • Verification of tool collision is an important issue in die and mold machining. In this paper three functions of verification are schematically explained based on Z-Map model. The first function is getting a collision-free region when a tool assembly and a part surface model are given. The second function estimates the shortest length of cutter shank with that the tool cuts all of a region without collision. The last one is cutting simulation considering all parts of tool assembly as well as cutter blade. Those functions can be easily implemented by using several basic operators of Z-Map model which are explained also. Proposed approaches have enough accuracy to verify collision in reasonable computing time.

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Graphic Simulation of Material Removal Process Using Bounding Box and Base Plane (기준평면과 경계상자를 이용한 NC 절삭과정의 그래픽 시뮬레이션)

  • 이철수;박광렬
    • Korean Journal of Computational Design and Engineering
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    • v.2 no.3
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    • pp.161-174
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    • 1997
  • In this paper, the techniques for graphic simulation of material removal process are described. The concepts of the bounding box and base plane are proposed. With these concepts, a real-time shaded display of a Z-map model being milled by a cutting tool following an NC path can be implemented very efficiently. The base planes make it possible to detect the visible face of Z-map model effectively. And the bounding box of tool sweep volume provides minimum area of screen to be updated. The proposed techniques are suitable for implementation in raster graphic device and need a few memories and a small amount of calculation. Proposed method is written in C and executable on MS-Windows95 and Window-NT.

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Development of CAM system for high speed cutting simulation in automobile part die (자동차 부품금형의 고속모의 가공용 CAM시스템 개발)

  • 장동규;김준형;양균의
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.822-826
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    • 1997
  • 근래에 들어, 금형생산 시간의 단축과 고정밀도의 제품을 생산하기 위해 실가공전의 설계단계에서 금형 데이터를 수치적으로 검증할 필요가 높아지고 있다. 기존의 저가형 CAM시스템에서 사용된 경로표시법으 로는 이러한 검증이 불가능하기 때문에 새로운 방법의 도입이 필요하며 모의가공 형상의 표현에서도 비매 개변수형 곡면을 이영하는 방법이 널리 사용되고 있다. 본 연구는 3축 금형가곡에 사용되는 볼앤드밀, 평 엔드밀 공구에 대해 Z-map을 기반으로 절삭부위를 비매개변수형 곡면으로 모델링하여 모의가공을 수행하 고자 한다. 또한, 새로운 backeting영역지정 방법을 사용하여 모의가공의 효율을 높였다.

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Development of Cutting Simulation System for Prediction and Regulation of Cutting Force in CNC Machining (CNC 가공에서 절삭력 예측과 조절을 위한 절삭 시뮬레이션 시스템 개발)

  • 고정훈;이한울;조동우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.3-6
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    • 2002
  • This paper presents the cutting simulation system for prediction and regulation of cutting force in CNC machining. The cutting simulation system includes geometric model, cutting force model, and off-line fred rate scheduling model. ME Z-map(Moving Edge node Z-map) is constructed for cutting configuration calculation. The cutting force models using cutting-condition-independent coefficients are developed for flat-end milling and ball-end milling. The off-line feed rate scheduling model is derived from the developed cutting force model. The scheduled feed rates are automatically added to a given set of NC code, which regulates the maximum resultant cutting force to the reference force preset by an operator. The cutting simulation system can be used as an effective tool for improvement of productivity in CNC machining.

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A NATURAL MAP ON AN ORE EXTENSION

  • Cho, Eun-Hee;Oh, Sei-Qwon
    • Journal of the Chungcheong Mathematical Society
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    • v.31 no.1
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    • pp.47-52
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    • 2018
  • Let ${\delta}$ be a derivation in a noetherian integral domain A. It is shown that a natural map induces a homeomorphism between the spectrum of $A[z;{\delta}]$ and the Poisson spectrum of $A[z;{\delta}]_p$ such that its restriction to the primitive spectrum of $A[z;{\delta}]$ is also a homeomorphism onto the Poisson primitive spectrum of $A[z;{\delta}]_p$.