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Multi-objective formulations are realistic models for many complex engineering optimization problems. In many real-life problems, objectives under consideration conflict with each other, and optimizing a particular solution with respect to a single objective can result in unacceptable results with respect to the other objectives. A reasonable solution to a… (More)

& Conclusions-A problem specific genetic algorithm (GA) is developed and demonstrated to analyze series-parallel systems and to determine the optimal design configuration when there are multiple component choices available for each of several k-out-of-n:G subsystems. The problem is to select components and levels of redundancy to optimize some objective… (More)

—This paper presents a genetic algorithm (GA) with specialized encoding, initialization, and local search operators to optimize the design of communication network topologies. This NP-hard problem is often highly constrained so that random ini-tialization and standard genetic operators usually generate infea-sible networks. Another complication is that the… (More)

Scope and Purpose-There are a vast number of practical design and resource-allocation problems, in many different fields, where the decision to be made is a matching (or assignment) of items in one set to items in another, disjoint set. If the costs associated are simply constants for each possible pairing, this is the classical "Assignment Problem", for… (More)

—This paper uses an ant colony meta-heuristic optimization method to solve the redundancy allocation problem (RAP). The RAP is a well known NP-hard problem which has been the subject of much prior work, generally in a restricted form where each subsystem must consist of identical components in parallel to make computations tractable. Meta-heuristic methods… (More)

& Conclusions-The use of computer communication networks has been rapidly increasing to 1) share expensive hardware and software resources, and 2) provide access to main systems from distant locations. The reliability and the cost of these systems are important considerations that are largely determined by network topology. Network topology consists of… (More)

Al~raet-Reliability optimization has been studied in the literature for decades, usually using a mathematical programming approach. Because of these solution methodologies, restrictions on the type of allowable design have been made, however heuristic optimization approaches are free of such binding restrictions. One difficulty in applying heuristic… (More)