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  • 1
    ISSN: 1436-5057
    Keywords: 90C30 ; 65K05 ; Nonlinear programming algorithms ; penalty algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Diese Arbeit beschreibt einen Algorithmus zur Minimierung einer nichtlinearen Funktion mit nichtlinearen Ungleichungen und Gleichungen als Nebenbedingungen. Die vorgeschlagene Methode hat die Eigenschaft, daß sie unter schwachen Voraussetzungen gegen einen Kuhn-Tucker-Punkt des betrachteten Optimierungsproblems konvergiert und unter stärkeren Voraussetzungen eine quadratische Konvergenzgeschwindigkeit aufweist. Ähnlich wie eine vor kurzem von Rosen vorgeschlagene Methode benutzt der Algorithmus eine Straffunktion, um einen Punkt in der Nähe der optimalen Lösung zu berechnen und schaltet dann auf Robinsons Methode um. Die neue Methode hat gegenüber dem Verfahren von Rosen zwei neue Eigenschaften. Erstens wird der richtige Wert des Parameters in der Straffunktion automatisch gefunden. Zweitens enthalten die mit der Methode von Robinson gelösten Teilprobleme nur lineare Gleichungen als Nebenbedingungen. Die Teilprobleme können daher besonders leicht gelöst werden. Vorläufige numerische Ergebnisse werden berichtet.
    Notes: Abstract This paper presents an algorithm for the minimization of a nonlinear objective function subject to nonlinear inequality and equality constraints. The proposed method has the two distinguishing properties that, under weak assumptions, it converges to a Kuhn-Tucker point for the problem and under somewhat stronger assumptions, the rate of convergence is quadratic. The method is similar to a recent method proposed by Rosen in that it begins by using a penalty function approach to generate a point in a neighborhood of the optimum and then switches to Robinson's method. The new method has two new features not shared by Rosen's method. First, a correct choice of penalty function parameters is constructed automatically, thus guaranteeing global convergence to a stationary point. Second, the linearly constrained subproblems solved by the Robinson method normally contain linear inequality constraints while for the method presented here, only linear equality constraints are required. That is, in a certain sense, the new method “knows” which of the linear inequality constraints will be active in the subproblems. The subproblems may thus be solved in an especially efficient manner. Preliminary computational results are presented.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 5 (1986), S. 371-394 
    ISSN: 1572-9338
    Keywords: Quadratic programming ; active set algorithms ; parametric Hessian matrix
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract We present a general active set algorithm for the solution of a convex quadratic programming problem having a parametrized Hessian matrix. The parametric Hessian matrix is a positive semidefinite Hessian matrix plus a real parameter multiplying a symmetric matrix of rank one or two. The algorithm solves the problem for all parameter values in the open interval upon which the parametric Hessian is positive semidefinite. The algorithm is general in that any of several existing quadratic programming algorithms can be extended in a straightforward manner for the solution of the parametric Hessian problem.
    Type of Medium: Electronic Resource
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  • 3
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    London : Periodicals Archive Online (PAO)
    Contributions to Political Economy. 5 (1986:Mar.) 103 
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 29 (1979), S. 53-65 
    ISSN: 1573-2878
    Keywords: Quadratic programming ; linear programming ; engineering plasticity ; limit-load analysis ; displacement analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In engineering plasticity, the behavior of a structure (e.g., a frame or truss) under a variety of loading conditions is studied. Two primary types of analysis are generally conducted. Limit analysis determines the rigid plastic collapse load for a structure and can be formulated as a linear program (LP). Deformation analysis at plastic collapse can be formulated as a quadratic program (QP). The constraints of the two optimization problems are closely related. This paper presents a specialization of the projection method for linear programming for the limit-load analysis problem. The algorithm takes advantage of the relationship between the LP constraints and QP constraints to provide advantageous starting data for the projection method applied to the QP problem. An important feature of the method is that it avoids problems of apparent infeasibility due to roundoff errors. Experimental results are given for two medium-sized problems.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 16 (1975), S. 25-38 
    ISSN: 1573-2878
    Keywords: Mathematical programming ; quadratically convergent algorithms ; conjugate-direction methods ; linearly constrained nonlinear programming ; nonlinear programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An iterative procedure is presented which uses conjugate directions to minimize a nonlinear function subject to linear inequality constraints. The method (i) converges to a stationary point assuming only first-order differentiability, (ii) has ann-q step superlinear or quadratic rate of convergence with stronger assumptions (n is the number of variables,q is the number of constraints which are binding at the optimum), (iii) requires the computation of only the objective function and its first derivatives, and (iv) is experimentally competitive with well-known methods.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 64 (1990), S. 43-53 
    ISSN: 1573-2878
    Keywords: Convex quadratic programming ; stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper establishes a simple necessary and sufficient condition for the stability of a linearly constrained convex quadratic program under perturbations of the linear part of the data, including the constraint matrix. It also establishes results on the continuity and differentiability of the optimal objective value of the program as a function of a parameter specifying the magnitude of the perturbation. The results established herein directly generalize well-known results on the stability of linear programs.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 79 (1993), S. 463-478 
    ISSN: 1573-2878
    Keywords: Knapsack problems ; isotonic regression ; quadratic programs ; parametric programs ; optimality conditions ; Lagrange function ; Lagrange multiplier ; breakpoints ; maximal cuts ; active sets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We introduce the isotonic regression knapsack problem $$\begin{gathered} \min (1/2)\sum\limits_{i = 1}^n {\{ d_i x_i^2 - 2\alpha _i x_i \} } , \hfill \\ s.t. \sum\limits_{i = 1}^n {a_i x_i } = c, x_1 \leqslant x_2 \leqslant \cdots \leqslant x_{n - 1} \leqslant x_n , \hfill \\ \end{gathered} $$ where eachd i is positive and each α i ,a i ,i=1, ...,n, andc are arbitrary scalars. This problem is the natural extension of the isotonic regression problem which permits a strong polynomial solution algorithm. In this paper, an approach is developed from the Karush-Kuhn-Tucker conditions. By considering the Lagrange function without the inequalities, we establish a way to find the proper Lagrange multiplier associated with the equation using a parametric program, which yields optimality. We show that such a procedure can be performed in strong polynomial time, and an example is demonstrated.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 86 (1995), S. 245-250 
    ISSN: 1573-2878
    Keywords: Parametric quadratic programs ; semicontinuity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper establishes results on the lower semicontinuity and continuity of the optimal objective value of a parametric quadratic program with continuous dependence of the coefficients on parameters. The results established herein generalize directly well-known results on parametric linear programs.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of global optimization 10 (1997), S. 77-90 
    ISSN: 1573-2916
    Keywords: Global optimization ; parametric quadratic programming ; non-convex quadratic program.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We present a method which when applied to certain non-convex QP will locatethe globalminimum, all isolated local minima and some of the non-isolated localminima. The method proceeds by formulating a (multi) parametric convex QP interms ofthe data of the given non-convex QP. Based on the solution of the parametricQP,an unconstrained minimization problem is formulated. This problem ispiece-wisequadratic. A key result is that the isolated local minimizers (including theglobalminimizer) of the original non-convex problem are in one-to-one correspondencewiththose of the derived unconstrained problem. The theory is illustrated with several numerical examples. A numericalprocedure isdeveloped for a special class of non-convex QP's. It is applied to a problemfrom theliterature and verifies a known global optimum and in addition, locates apreviously unknown local minimum.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 32 (1988), S. 271-297 
    ISSN: 1432-5217
    Keywords: Quadratic programming ; optimization ; conjugate directions ; decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Unter Benutzung von konjungierten Richtungen wird eine Methode zur Lösung von konvexen, quadratischen Optimierungsproblemen entwickelt. Der Algorithmus erzeugt eine Folge von zulässigen Lösungen und endet nach einer endlichen Anzahl von Iterationen. Erweiterungen des Algorithmus für nichtkonvexe und für große strukturierte quadratische Optimierungsprobleme werden diskutiert.
    Notes: Abstract By using conjugate directions a method for solving convex quadratic programming problems is developed. The algorithm generates a sequence of feasible solutions and terminates after a finite number of iterations. Extensions of the algorithm for nonconvex and large structured quadratic programming problems are discussed.
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