نتایج جستجو برای: augmented downhill simplex method adsm

تعداد نتایج: 1697296  

Journal: :Environmental Modelling and Software 2016
Ioannis Tsoukalas Panagiotis Kossieris Andreas Efstratiadis Christos Makropoulos

In water resources optimization problems, the objective function usually presumes to first run a simulation model and then evaluate its outputs. However, long simulation times may pose significant barriers to the procedure. Often, to obtain a solution within a reasonable time, the user has to substantially restrict the allowable number of function evaluations, thus terminating the search much e...

2007
Nicolas Wiest-Daesslé Pierre Yger Sylvain Prima Christian Barillot

We propose to use a recently introduced optimisation method in the context of rigid registration of medical images. This optimisation method, introduced by Powell and called NEWUOA, is compared with two other widely used algorithms: Powell’s direction set and Nelder-Mead’s downhill simplex method. This paper performs a comparative evaluation of the performances of these algorithms to optimise d...

2015
Chih-Ju Chang Geng-Li Lin Alex Tse Hong-Yu Chu Ching-Shiow Tseng

C-Arm image-assisted surgical navigation system has been broadly applied to spinal surgery. However, accurate path planning on the C-Arm AP-view image is difficult. This research studies 2D-3D image registration methods to obtain the optimum transformation matrix between C-Arm and CT image frames. Through the transformation matrix, the surgical path planned on preoperative CT images can be tran...

2001
Artur Krukowski Izzet Kale

The paper addresses tlie design of tlie polyphase IIR filters based on the “’-order single-coefficient allpass sub-filters in the constraint coefficient space using the Constraint Dowdiill Simplex Algorithm. Incorporating the bit-flipping algorithm into its core engine allowed the optitilisation routine to converge to better target designs without affecting tlie Iiigli speed of tlie original al...

The issue of pressure sensitivity of anisotropic sheet metals is investigated with introducing two new non-AFR criteria which are called here linear and non-Linear pressure sensitive criteria. The yield and plastic potential functions of these criteria are calibrated with directional tensile/compressive yield stresses and directional tensile Lankford coefficients, respectively. To determine unk...

2002
Pierre-Marc Jodoin Victor Ostromoukhov

In this contribution, we present an optimal halftoning algorithm that uniformly distributes pixels over a hexagonal grid. This method is based on a slightly modified error-diffusion approach presented at SIGGRAPH 2001. Our algorithm’s parameters are optimized using a simplex downhill search method together with a blue noise based cost function. We thus present a mathematical basis needed to per...

Journal: :Computing in Science and Engineering 2000
John C. Nash

G eorge Dantzig, in describing the " Origins of the Simplex Method, " 1 noted that it was the availability of early digital computers that supported and invited the development of LP models to solve real-world problems. He agreed that invention is sometimes the mother of necessity. Moreover, he commented that he initially rejected the simplex method because it seemed intuitively more attractive...

1999
Kwang-Sup Soh

In the microcanonical ensemble for string theory on AdSm × Sn, there is a phase transition between a black hole solution extended over the Sn and a solution localized on the Sn if the AdSm has the topology R 2 × Sm−2. The phase transition will not appear if the AdSm has the topology R 2 × Tm−2, that is, when the AdSm × Sn geometry is regarded as arising from the nearhorizon limit of a black m −...

2002
Andreas Efstratiadis Demetris Koutsoyiannis

The evolutionary annealing-simplex algorithm is a probabilistic heuristic global optimisation technique that joins ideas from different methodological approaches, enhancing them with some original elements. The main concept is based on a controlled random search scheme, where a generalised downhill simplex methodology is coupled with a simulated annealing procedure. The algorithm combines the r...

1997
Junpei Niwa Tatsushi Inagaki Takashi Matsumoto Kei Hiraki

We have proposed an \Asymmetric Distributed Shared Memory: ADSM", that provides users with efcient shared memory model. The ADSM is a hybrid system that needs not only the operating system support but also the compiler support. The ADSM executes a load instruction as the shared-read with the assistance of virtual memory mechanism. As for the shared-write, the ADSM executes a sequence of instruc...

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