A new network simplex algorithm to reduce consecutive‎ ‎degenerate pivots and prevent ‎stalling‎

نویسندگان

  • Z. ‎Aghababazadeh‎‎ Department of Mathematics‎, ‎Science and‎ ‎Research Branch, ‎Islamic Azad University‎, ‎Tehran‎, ‎Iran‎.
چکیده مقاله:

It is well known that in operations research‎, ‎degeneracy can cause a cycle in a network‎ ‎simplex algorithm which can be prevented by maintaining strong‎ ‎feasible bases in each pivot‎. ‎Also‎, ‎in a network consists of n arcs‎ ‎and m nodes‎, ‎not considering any new conditions on the entering‎ ‎variable‎, ‎the upper bound of consecutive degenerate pivots is equal‎ $left( ‎begin{array}{c}‎ ‎n-m+k \‎ ‎k \‎ ‎end{array}‎ ‎right)$‎ ‎where $k$ is the number of degenerate arcs in the basis‎. ‎As‎ ‎well as‎, ‎the network simplex algorithm may stall if it goes through‎ ‎some long consecutive degenerate pivot‎. ‎Through conditions such as‎ ‎(LRC) and (LRS) upon entering variable rules‎, ‎this upper bound can‎ ‎be reduced to $mn$ and $m^2$ respectively‎. ‎In this current paper we‎ first suggest a new algorithm for anti--stalling in which a new‎ ‎condition is provided to the entering variable and then show that‎ ‎through this algorithm there are at most $k$ consecutive degenerate ‎pivots.‎

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a new network simplex algorithm to reduce consecutive‎ ‎degenerate pivots and prevent ‎stalling‎

it is well known that in operations research‎, ‎degeneracy can cause a cycle in a network‎ ‎simplex algorithm which can be prevented by maintaining strong‎ ‎feasible bases in each pivot‎. ‎also‎, ‎in a network consists of n arcs‎ ‎and m nodes‎, ‎not considering any new conditions on the entering‎ ‎variable‎, ‎the upper bound of consecutive degenerate pivots is equal‎ $left( ‎begin{array}{c}‎ ‎n...

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عنوان ژورنال

دوره 8  شماره 3

صفحات  209- 214

تاریخ انتشار 2016-08-01

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