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  • 1
    Electronic Resource
    Electronic Resource
    On the X-Y convex hull of a set of X-Y polygons (1983)
    Springer
    BIT 23 (1983), S. 456-471 
    Details
    ISSN: 1572-9125
    Keywords: Analysis of algorithms ; convexity ; rectilinear polygons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We study the class of rectilinear polygons, calledX – Y polygons, with horizontal and vertical edges, which are frequently used as building blocks for very large-scale integrated (VLSI) circuit layout and wiring. In the paper we introduce the notion of convexity within the class ofX – Y polygons and present efficient algorithms for computing theX – Y convex hulls of anX – Y polygon and of a set ofX – Y polygons under various conditions. Unlike convex hulls in the Euclidean plane, theX – Y convex hull of a set ofX – Y polygons may not exist. The condition under which theX – Y convex hull exists is given and an algorithm for testing if the given set ofX – Y polygons satisfies the condition is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01933620
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A self-learning fuzzy controller for wire rupture prevention in WEDM (1996)
    Springer
    The international journal of advanced manufacturing technology 11 (1996), S. 267-275 
    Details
    ISSN: 1433-3015
    Keywords: Self-learning fuzzy controller ; Sparking frequency ; Wire breaking ; Wire electrical discharge machining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Wire breaking is a serious problem in the application of wire electrical discharge machining (WEDM). A WEDM sparking frequency monitoring and control system based on the characteristics of the voltage waveform of WEDM is developed. Two types of wire breaking phenomena are categorised according to the duration of the symptoms: a sudden rise of sparking frequency, and a sluggish rise of sparking frequency. Based on these results, a new self-learning fuzzy controller (SLFC) is proposed. The pulse off-time is regulated in real-time to keep the sparking frequency at a safe level so that wire breaking can be prevented. Experimental results show that this monitoring and control system can control the sparking frequency at an optimal high metal removal rate level without the risk of wire rupture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01351284
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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