Top Research Papers on Optimization Techniques

The different optimization methods are reviewed to completely understand the need of these techniques to solve high end problems in OPTICAL networks.

Abstract : This report covers the third quarter of an applied research program to develop a scannable photosensitive image detector capable of responding to modulation at a microwave rate. The dc focusing tests were completed, and the detector now operates satisfactorily in a stack of permanent magnets rather than the large solenoid previously used. The direct modulation-demodulation experiment is now working very well with a modulation frequency of 10.7 Gc. Operation was demonstrated in both a nonscanning mode and in a scanning mode with a microwave output signal level of -90 dbm. The continu...

This document contains the summary of eleven-research projects performed under this contract, which concern developing models and special algorithms for a variety of operations research problems.

A recent analytical approach to synthesis is employed to arrive at a simple optimization scheme. The approximate solution of the synthesis problem is derived in terms of the Fresnel amplitudes at each boundary. The set of dielectric materials to be used in the design defines the set of possible Fresnel amplitudes. These values are matched to the approximate solution and the necessary distribution of the materials and their thicknesses are deduced. The approach can be done graphically by plotting the analytic (ideal) solution (Fresnel amplitudes vs thickness) and then draw horizontal lines corr...

Este trabalho apresenta tres estudos principais acerca do desenvolvimento e aplicacao de sistemas de monitorizacao optica avancados com base na analise de histogramas assincronos, conversao de comprimento de onda de sinais de debito elevado e o impacto das nao-linearidades das fibra opticas em sistemas utilizando tecnicas avancadas de transmissao. Mostra-se que a comparacao de histogramas assincronos com histogramas de referencia pode ser usada para extrair informacao a respeito da qualidade e do ruido que afecta o sinal em analise. O metodo proposto e validado atraves de simulacao numerica e ...

The resolution and precision of an optical encoder are determined by three factors: (1) the distance between the photodetector and the slit disk, (2) the ratio of the width of the active area of the photodetector to the width of the slit of the slit disk, and (3) the concentricity of the photodetector and the slit disk. A quantitative analysis of these factors generally requires a grasp of sophisticated analytical techniques, including an incoherent spectrum, the optical system of the light emitting diode (LED), and diffraction. We propose a breadboard system and techniques for obtaining the s...

In this paper, machine learning techniques relevant to optical communication are presented and discussed. The focus is on applying machine learning tools to optical performance monitoring and performance prediction.

This paper discusses the application of optimal filtering techniques for the adaptive optics system of the LBT telescope and focuses on the H∞ filter and on its advantages and disadvantages over the Kalman filter.

In this paper we will discuss the application of different optimal control techniques for the adaptive optics system of the LBT telescope which comprises a pyramid wavefront sensor and an adaptive secondary mirror. We have studied the application of both the Kalman and the H∞ filter to estimate the temporal evolution of the phase perturbations due to the atmospheric turbulence and the telescope vibrations. We have evaluated the performance of these control techniques with numerical simulations in preparation of the laboratory tests that will be carried out in the Arcetri laboratories.

This paper summarizes the widely used adaptive optimization algorithms, such as the LMS algorithm, after briefly introducing the commonly used equalization schemes in optical receivers.

Analysis of relay-assisted transmission to overcome fading effect in long range wireless optical communication channel considering atmospheric turbulence as a fading effect and implementing serial and parallel relaying configuration through particle swarm optimization(PSO) technique to find an optimized solution of relay locations so as to minimize the outage probability and improve the performance.

The authors' experience with the application of the needle optimization technique to the design of optical coating is summarized and a physical interpretation of the technique is provided.

Customers complain has been received due to defect found at their field specifically the Scratches and Bump Defects. Ironically, defect found at their end should not be reaching since there is an AOI Process at WLCSP. Every complaint has been documented through EFAR and validated one by one.

This thesis proposes the first convexoptimization based estimation method for blind deconvolution problems that estimate aberration and object when the images are acquired using coherent illumination and identifies the dynamics according to which the aberration evolves over time.

The backbone data networks and infrastructures now depend largely on optical connectivity, and consumers rely more and more on wireless connections to obtain all these data.

This article aims at providing and illustrating for discussion of the most established results on PSO algorithm as well as exposing the most active research topics that can give proposal for future work and help the practitioner improves better result with little effort.

A basic overview of optimization techniques is provided, and the standard form of the general non-linear, constrained optimization problem is presented, and various techniques for solving the resulting optimization problem are discussed.

Abstract : Sensitivity analysis is performed for general structures. Gradual improvement in the design of a vibrating structure is attempted by an iterative process, where the frequency of vibration depends upon the design. Abstract Frechet differentiation is used to establish necessary criteria for optimization. Particular attention is given to the problem of optimization of gun tube.

Abstract Systematic row atom location by channelling-enhanced microanalysis (ALCHEMI) experiments have been optimized theoretically with regard to dynamical interaction (beam voltage and reflecting planes), foil thickness and orientation. The optimum level of dynamical interaction is w s = 21/2 + Ξg/2Ξ2 g, the optimum orientation is the symmetry orientation and the optimum foil thickness lies between Ξg/4 and Ξg/3 when dynamical interaction is optimized. The corresponding maximum level of channelling is about 0.3–0.5, depending on absorption. Experimental measurements show good agreement with ...

Some common analytical and numerical techniques of finding the maximum or a minimum of multivariable functions are presented, including Lagrange's method of undetermined multipliers, linear and dynamic programming.

To obtain a way to control or manage a physical system, this work introduces a mathematical model that closely represents the physical system and describes and represents the real system.

The key optimization techniques associated with some of the fundamental mobility functions, namely discovery, authentication, configuration, security association, binding update, media rerouting, route optimization and cross layer triggers, are described.

There is a need to develop more powerful optimization techniques and research is going on to find effective optimization techniques since last three decades.

The objective of this paper, is to share the clock tree optimization techniques and the result of the optimization techniques, from timing, power and skew aspects, that will benefit the design community in clock optimization solutions.

Researchers tend to come back to genetic and evolutionary algorithms recently as they are suited for parallel processing, finding global optima, and are reported to be suitable for a large number of design variables.

Research indicates that the optimal squat technique is a wide stance (>= shoulder width) with natural foot positioning, unrestricted movement of the knees, and full depth while the lordotic curve of the lumbar spine is maintained with a forward or upward gaze.

The technique described in this paper is believed to offer a new dhnension to the nuclear physicist and the lack of a proof of optimality is understandable since the procedure cannot be guaranteed to converge with predetermined accuracy and with a bound on the number of function evaluations.

Abstract : A single-axis satellite attitude control system is used as an example for the application of several optimization techniques. The vehicle and actuator dynamics are linear and the performance criterion is quadratic (related to minimumenergy control). The techniques used are the classical calculus of variations, the maximum principle, dynamic programming, and steepest descent. (Author)

The author presents the technique based on the gradient theory, noticing that this kind of problem is a nonlinear programming problem and the implementation of the optimal control law is quite simple and easy.

Interior point methods for semi-infinite calculations, M.J.D. Powell extending the optimization paradigm in engineering design, P.Y. Papalambros recent developments in integer programming, G.L. Nemhauser a computational approach to an optimal control problem with a cost on changing controls, K.L. Teo stochastic programming - optimizing the uncertain, J.R. Birge numerical experience with limited-memory quasi-Newton and truncated Newton methods, I.M. Navon matrix shadow costs for multilinear programmes, B.D. Craven effective simulation of optimal trajectories in stochastic control, P.E. Kloeden ...

A model for displaying a list of search results by means of textual elements that utilize a new information limit that replaces the currently used information unit is focused on.

This paper proposes a procedure for improving performance by selective sensor exclusion, and demonstrates that improvement in signal to noise ratio can be realized when the choice is made to use "n-1" rather than "n" sensors from an " n" sensor array.

The investigation established the techniques to evaluate the lethality of blast/fragmentation, continuous rod, and submissile warheads when deployed against airborne targets and the lethal area of flechette-projecting warheads deployed against standing, prone or foxholed troop concentrations.

The particle swirl algorithm (PSA) utilizes multiple solutions ("particles") that rotate or "swirl" around a center point based on the principle of water spiraling toward a drain, so the center point is known as the vortex.

The objective is to present the evolution and principle of simulation- optimization technique, some examples of simulation - optimization technique application, classification of the technique, and computer software for simulation – optimization.

This chapter will discuss the implementation of the reasoning services which form the core of DL-based knowledge representation systems, which need both expressive logics and fast reasoners to be useful in realistic applications.

Many of the concepts utilized in unconstrained optimization techniques can be extended to the constrained case, and the solution obtained is the same one obtained using techniques for constrained optimization.

The special issue of the Journal of ECT focused on and brought together a wealth of information on cognitive side effects of electroconvulsive therapy (ECT) and concluded that safe and effective ECT is possible, given proper stimulus characteristics and electrode placement.

The design of high speed rotor concepts using multi-modal approaches to optimization techniques and their applications are proposed.

This chapter contains sections titled: Technology Mapping for Low Power POSE: Power Optimization and Synthesis Environment Transformation and Syntheses of FSMs for Low-Power Gated-Clock Implementation Precomputation-Based Sequential Logic Optimization for low Power Glitch Analysis and Reduction in Register Transfer Level Power Optimized.

SUMMARIES In the context of a larger research project in the field of paper conservation several kinds of fibre were used for making conservation paper in the leafcasting machine. Accelerated ageing was performed according to EN/ISO 5630/3 (80°C 65% RH; 24 days). The samples were submitted to comparative measuring of several physical, mechanical, chemical and optical qualities. In addition to the obvious result that for conservation purposes quality raw materials must be used it was found that an addition of up to 30–40% of unbleached fibre to the leafcasting pulp resulted in the favourable ch...

This chapter will investigate popular multi-objective optimization techniques, giving both their basics and describing recent advancements.

In Gordon’s executive routine the priority of a task is calculated as a simple, usually linear, function of the time elapsed since the task was last called, with the initial priority of each task preassigned.

This paper outlines the steps taken to reduce the processing time of a Reed-Solomon encoding and the insight into modern optimization techniques gained from the experience.

This paper presents a preliminary study concerning the optimization of rotors at their transient motion. The rotors are modeled using the Transfer-Matrix-Method and the equations of motion are integrated using a Newmark'scheme. The optimization strategy involves the minimization of the global strain energy of the system or the minimization of integral functions associated to the rotor displacements.

Synopsis: Classical Optimisation Techniques, Optimisation and Inequalities, Numerical Methods of Optimisation, Linear Programming Techniques, Non-linear Programming Techniques, Dynamic Programming Methods, Variational Methods, Stochastic Approximation Procedures, Optimisation in Simulation, Optimisation in Function Spaces Classical Optimisation Techniques: Preliminaries, Necessary and Sufficient Conditions for an Extremum, Constrained Optimisation - Lagrange Multipliers, Statistical Applications Optimisation and Inequalities: Classical Inequalities, Matrix Inequalities, Applications Numerical ...

The range of applications from small activators to optimization of induction heating systems in this third chapter is itemized, itemizing the range of decisions that condition computational electromagnetism’s future development.

Optimization techniques have been successfully applied to the solution of electric utility system operating and planning problems, and significant system improvements have been achieved.

This chapter is devoted to modeling and optimization techniques applicable to communication network design and planning, and main emphasis is put on the models dealing with optimization of the capacity of network resources and traffic routing that lead to tractable optimization problems.

Examples of how the newer techniques have contributed to the improvement in technological processes are presented, and the principles of constraint and uncertainty programming outlined.