We introduce a novel finite-difference (FD) approach for seismic wave extrapolation in time. We derive the coefficients of the finite-difference operator from a lowrank approximation of the space-wavenumber, wave-propagator matrix. Applying the technique of lowrank finite-differences, we also improve the finite difference scheme of the two-way Fourier finite differences (FFD). We call the new o...

Providing resource for virtual services in cloud computing which requires saving the resource and minimizing the amount of energy consumption is critical. In this study, we propose the resource model and linear programming formulation for multi-dimensional resource allocation problem. Based on the simulated annealing algorithm, RASA algorithms were designed to solve and evaluate through Cloudsi...

We introduce and investigate several state-of-the-art shape deformation methods for their use in evolutionary design optimization problems. Starting from classical free-form deformation (FFD) we broaden our investigation to more flexible methods such as direct manipulation FFD and deformations based on radial basis functions. We integrate the different methods into a framework for evolutionary ...

introduction: nowadays new radiochromic films have an essential role in radiotherapy dosimetry. properties such as high sensitivity, good reproducibility, high spatial resolution, easy readout and portability have made them attractive for dosimetry, especially in high-dose-gradient regions. material and methods: in this study, electron-beam dose distributions in homogenous and heterogeneous pha...

astigmatism’s defect has not yet been formulated in physics and medical physics books theoretically. in this paper, we are trying to formulate the astigmatism’s defect. the results of formulation show that “the degree of astigmatism is negative reverse the distance that vision’s condition of astigmatism’s chart lines change conditions in dimness angle from dimness condition at infinite distance...

Tolerance-based feature transforms (TFTs) assign to each pixel in an image not only the nearest feature pixels on the boundary (origins), but all origins from the minimum distance up to a user-defined tolerance. In this paper, we compare four simple-to-implement methods for computing TFTs on binary images. Of these methods, the Fast Marching TFT and Euclidean TFT are new. The other two extend e...

Associate to a rewrite system R having rules l → r, its labelled version R having rules l ◦ m+1 → r • m , for any natural number m ∈ ω. These rules roughly express that a left-hand side l carrying labels all larger than m can be replaced by its right-hand side r carrying labels all smaller than or equal to m. A rewrite system R enjoys finite family developments (FFD) if R is terminating. We sho...

Gunung Rajabasa merupakan salah satu lapangan panas bumi di Sumatra yang belum dapat dieksploitasi hingga saat ini. Keberadaan manifestasi daerah ini menjadi petunjuk keberadaan zona reservoar bumi. Penelitian bertujuan untuk mengidentifikasi permeabilitas tinggi berdasarkan analisis Fault Fracture Density (FFD) dan menganalisis keterkaitan antara karakteristik struktur jalur fluida ke permukaa...