th The purpose of this volume is to reflect the scientific activities during the 16 Sym­ posium on Operations Research which took place at the University of Trier from September 9 through September 11, 1991. The Symposia on Operations Research are the annual conferences of the Gesellschaft fur Mathematik, Okonomie und Operations Research (GMOOR). This so­ ciety which was founded in 1977 pursues the goal to support and facilitate research, development, application and education in an area where mathematics, economICS, operations research, computer science and system theory come together. th The 16 ' Symposium on Operations Research stood under t.he auspices of the Minister­ priisident of the state of Rheinland-Pfalz, Rudolf Scharping. The opening addresses were given by the president of the Universitiit Trier, Professor Hasler, by the Minister fur Wissenschaft und Weiterbildung, Professor Zollner, and by Professor Hettich, on behalf of the organizers. These addresses are printed as part of the introductory material of this volume. The conference was attended by 351 participants from 29 countries; more than 70% of the participants gave lectures on their current res each interests, surveys on spe­ cial topics or software demonstrations. They made the meeting truely a successful international forum for scientific exchange. The conference was highlighted by the award of the society's scientific prize in memo­ riam Rudolf Henn to Professor R.E. Burkard, Technical University Graz, and his plenary GMOOR-Award winner lecture on Convexity and Discrete Optimization.

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InhaltsangabeGMOOR-Award Winner.- The role of convexity in discrete optimization.- Plenary Lectures.- Direct search methods on parallel machines.- A probabilistic look at options and at the underlying randomness.- Pseudorandom number generators.- Learning, inferences and iterations.- Section 1: Optimization: Theory and Modelling.- Bayesian methods in global optimization.- Optimization of discrete manufacturing processes - branch and bound method.- Model estimation of air traffic control sectors capacity for solving the air traffic flow management problem.- Models for analysis of air traffic control systems in FIR Warsaw performed in view of its modernisation.- Second order analysis in semi-infinite programming.- Extremal spheres and semi-infinite duality theory.- Finding largest simplices.- Optimal well placement and management.- The optimal value function in quasidifferentiable programming.- Dynamization of the Promethee type problems.- First-order characterizations of generalized monotone maps.- Extended domination sets in vector optimization.- On some open problems in convex analysis.- Section 2: Optimization: Computational Methods.- Fuzzy choice in design of complicated systems.- A subgradient projection method in linear programming.- Copositivity and nonconvex optimization.- An algorithm for finding the global extremum of a multivariate Lipschitz function.- Quasi - Newton descent methods with inexact gradients.- Iterative methods for quadratic programming.- On the number of homotopy-invariant solutions for systems of polynomial equations.- An outer approximation method for solving canonical d.c. problems.- Using exact additive and multiplicative parts in quasi-Newton methods.- An interval method for global unconstrained optimization.- Fast algorithms for compact fixed point problems.- Parametric nonlinear optimization: stability of stationary solutions and some applications.- Method of solving alternative linear semi-infinite programming problem.- Multicriterial optimal control of dynamic multiconnected system.- A new method for solving general d.c. programs and application to system of quadratic equations.- Parallel direct search methods applied to seismic inverse problems.- Exploiting monotonicity in certain global optimization problems.- Estimating the complexity of path-following methods for linear programming by curvature integrals.- Section 3: Combinatorial Optimization and Discrete Mathematics.- The group theoretic approach and decomposition for integer linear programming.- The cone of nondecreasing set functions.- Theoretical and empirical relations between the duality-gap of the combinatorial p-median problem and the simple plant location problem.- "Monge"-property and efficient algorithms.- Universal conditions for algebraic traveling salesman problems to be efficiently solvable.- On the multi-depot vehicle routing problem.- Combinatorial minimization with multiplicative objective functions.- Contributions to two graph-theoretical conjectures.- Heuristics for several routing problems.- Combinatorial optimization problems in PCB assembly.- The absolute multi-factor evaluation process.- Optimal scheduling for linear dynamic processes.- Packing polyominoes.- Discrete optimization problem with branch structure in forest planning.- Section 4: Combinatorial Problems in VLSI, Scientific Computing.- Maximum folding, a generalization of maximum matching.- Implementation of interior point methods on parallel and vector machines.- Section 5: Systems and Control Theory.- Degrees of controllability.- On modeling and stabilization of flexible beams.- Stabilization of a class of discrete-time linear uncertain systems.- Dynamics of pollution, defined by fluid modeling.- Optimal abatement policies within a stochastic dynamic model of the firm.- Fluid modelling: a step toward more adequate modelling.- Topics on dynamics in infinite horizon concave problems.- Constitutive distributed parameter modelling of moving coordinate systems (Part 1).-