An eigenspace optimization approach is proposed and demonstrated for the design of feedback controllers for the maneuvers/vibration arrests of flexible structures. The algorithm developed is shown to be equally useful...
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The imaging of positron-emitting isotopes using a gamma camera requires special collimators. A ray-tracing method for simulating the point-spread function of collimators and, therefore, the total gamma camera system i...
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The imaging of positron-emitting isotopes using a gamma camera requires special collimators. A ray-tracing method for simulating the point-spread function of collimators and, therefore, the total gamma camera system is presented. Simulated data obtained by this method showed good agreement with experimental data. Using this method, optimal lead and tungsten collimators for positron emitters were devised;at an object distance of B = 100 mm, these yielded a point-spread function with an FWHMtot = 9.1 mm using an intrinsic resolution of FWHMintr = 8.0 mm.
A method for decomposing an optimization problem into a set of subproblems and a coordination problem that preserves coupling between the subproblems is described. The decomposition is achieved by separating the struc...
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The values of the mistiming which yield the most stable eigenvectors are analytically determined, using the simplified equations of motion which were developed in Part I of this work. It is also shown that random mist...
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The article investigates the treatment of pointwise state variable constraints for the dynamic response optimization problems. A suggested alternate treatment is to impose constraints at the two grid points that brack...
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The article investigates the treatment of pointwise state variable constraints for the dynamic response optimization problems. A suggested alternate treatment is to impose constraints at the two grid points that bracket a local max-point. This procedure could result in an optimization algorithm that would be more efficient and effective than previous algorithms. The performance of this procedure is studied.
A delicate differential game is formed by two aircraft performing a long-range missile duel. The duel starts for each aircraft with a semiagressive phase until the launch of the missile, when a pure evasion commences....
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This article presents experimental results of the application of an electric field to the blowoff limits of a premixed methane-air flame. The results indicate that, under suitable electrode configuration, electric fie...
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This article presents experimental results of the application of an electric field to the blowoff limits of a premixed methane-air flame. The results indicate that, under suitable electrode configuration, electric fields can be used as a suitable technique in controlling the combustion process.
The paper presents an optimization method based on optimality criterion for minimum weight design of structures with geometric nonlinear behavior. The nonlinear critical load is determined by finding the load level at...
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In conditions of monopolistic position of enterprises, they exhibit unrestrained tendency to increase the prices of their products, without taking care for full utilization of their production capacities. Such a situa...
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In conditions of monopolistic position of enterprises, they exhibit unrestrained tendency to increase the prices of their products, without taking care for full utilization of their production capacities. Such a situation may occur in the planned and as well as the free-market national economy. The decision center is able to counteract this tendency by introducing a proper system of income taxes, which results in the optimal prices providing the maximal profit. Simultaneously, due to the high level of the prime costs of small production series, there exists some threshold value in the relation between profit and production rate. If the production rate is less than this value, it is unprofitable. For reasons mentioned, the problem of enterprise profit optimization in the case of production capacities constrained, is a non-trivial mathematical programming problem. It is a mixed discrete-continuous optimization problem: the decision variables connected with selecting ranges of products are of discrete (zero-one) type: the decision variables associated with the choice of the optimal production rate are continuous. The paper presents an optimization algorithm which can be used to solve this mixed discrete-continuous decision problem. The worked out method can be also applied to other socio-economic decision problems of similar type.
This paper presents the results of a series of sampling experiments to evaluate the small sample properties of several variants of the nonlinear two stage and nonlinear three stage least squares estimators. The analys...
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