News Article | June 14, 2017
istyle Inc. (TSE First Section, Company Code: 3660) -- which is the Tokyo-based operator of @cosme, one of Asia's largest beauty information and review sites -- announced "@cosme THE BEST COSMETICS AWARDS 2017 Mid-Year New Products" on June 14, 2017. These awards recognize the most popular newly released products in the first half of 2017. About @cosme: @cosme is one of Asia's largest beauty information websites, with a loyal user base of Japanese women. The information and reviews posted on @cosme make it useful for women's daily beauty, earning it widespread support. About "@cosme THE BEST COSMETICS AWARDS 2017 Mid-Year New Products": The awards cover products released during the six-month period from November 1, 2016, to April 30, 2017. These awards recognize the products that have gained the most support from consumers, based on the reviews written by members of @cosme. Because the awards represent the viewpoint of consumers themselves, winning products attract attention from both users and those within the cosmetics and beauty industry. OPERA's "Lip Tint" wins Grand Prize: The Grand Prize went to the "Lip Tint" produced by OPERA, receiving the most favorable response from users on @cosme. Please refer to the following websites for more information. Japanese: http://www.cosme.net/bestcosme/2017_half English: http://us.cosme.net/bestcosmeRankings Traditional Chinese: http://tw.cosme.net/bestcosmeRankings Simplified Chinese: http://cn.cosme.net/bestcosmeRankings Korean: http://kr.cosme.net/bestcosmeRankings
Giboli M.,Total S.A. |
Agut C.,Total S.A. |
SEG Technical Program Expanded Abstracts | Year: 2015
Stacking is of paramount importance in seismic processing to improve the signal to-noise ratio (S/N) and the imaging quality of seismic data. The conventional stacking method that averages equally a collection of input traces cannot robustly suppress coherent noises. To attenuate this kind of noise and achieve an optimally stacked image remains an attractive and challenging topic in the seismic industry. The key point for ongoing research is to develop methods that can be used to reliably discriminate between "good" and "bad" data samples. To this end it is important to identify two key objectives for the process of optimal stacking. The first is to find a suitable domain where signal can be easily distinguished from noise and the second is to build a robust procedure that allows only the signal contribute to the final migrated stack. We describe a novel, iterative method to clean and enhance the stacked migration image. For band-limited migration algorithms we define an original pre-stack image domain that is analogous to the aperture partitioned migration domain of Kirchhoff-type migration techniques. Through an automatic procedure that is based on a coherence analysis we show how, in this domain, signal can be separated from both coherent and incoherent noise in an effective way. With the aid of synthetic examples we show how this yields to a superior quality image compared to a conventional migration stack. © 2015 SEG.
Fleury C.,Total S.A. |
Giboli M.,Total S.A. |
SEG Technical Program Expanded Abstracts | Year: 2014
Reflection tomography utilizes the kinematic information measured on reflection events present in seismic images in order to build better migration velocity models. The standard methodology consists of performing moveout analysis by picking the reflection events in the pre-stack migrated domain. Recent years have seen the proliferation of new methods to build more accurate and reliable image gathers for wave-equation migration by wave-field extrapolation. Several approaches exist to perform reflection tomography on these wave-equation image gathers. Our strategy relies on the adaptation of conventional moveout analysis techniques. Our method describes a mechanism for incorporating residual moveout picking in a general framework for wave-equation-based reflection tomography. The surface-offset pre-stack domain is a natural domain to perform moveout picking. We use surface-offset reverse-time migration image gathers. The application of the resulting tomography algorithm in the context of sub-salt imaging demonstrates the advantages of such methodology for addressing the challenging problem of model building in complex geological environment. © 2014 SEG.
Harmouche M.,OPERA |
Laghrouche S.,OPERA |
Chitour Y.,University Paris - Sud
International Journal of Robust and Nonlinear Control | Year: 2015
In this paper, we have studied the control problem of target point-based path following for car-type vehicles. This special path-following task arises from the needs of vision-based guidance systems, where a given target point located ahead of the vehicle, in the visual range of the camera, must follow a specified path. A solution to this problem is developed through a nonlinear transformation of the path-following problem into a reference trajectory tracking problem, by modeling the target point as a virtual vehicle. The use of target point complicates the control problem, as the development produces a first-order nonlinear nonglobally Lipschitz differential equation with finite escape time. This problem is solved by using small control signals. Bounded feedback laws are designed to control the real vehicle's angular acceleration and the virtual vehicle's velocity, to achieve stability. The resulting controller is globally asymptotically stable with respect to the origin, the proof of which is derived from Lyapunov-based arguments and a bootstrap argument. It is also shown that the use of exponentially convergent observers/differentiators does not affect the stability of the closed-loop system. The effectiveness of this controller has been illustrated through simulations. Copyright © 2014 John Wiley & Sons, Ltd.
Fomel S.,University of Texas at Austin |
Journal of Applied Geophysics | Year: 2014
Structural information in seismic images is uncertain. The main cause of this uncertainty is uncertainty in velocity estimation. We adopt the technique of velocity continuation for estimating velocity uncertainties and corresponding structural uncertainties in time-migrated images. Data experiments indicate that structural uncertainties can be significant even when both structure and velocity variations are mild. © 2013 The Authors.
Silvestrov I.,Russian Academy of Sciences |
Baina R.,OPERA |
Landa E.,Tel Aviv University
Geophysical Prospecting | Year: 2016
We propose a method for imaging small-scale diffraction objects in complex environments in which Kirchhoff-based approaches may fail. The proposed method is based on a separation between the specular reflection and diffraction components of the total wavefield in the migrated surface angle domain. Reverse-time migration was utilized to produce the common image gathers. This approach provides stable and robust results in cases of complex velocity models. The separation is based on the fact that, in surface angle common image gathers, reflection events are focused at positions that correspond to the apparent dip angle of the reflectors, whereas diffracted events are distributed over a wide range of angles. The high-resolution radon-based procedure is used to efficiently separate the reflection and diffraction wavefields. In this study, we consider poststack diffraction imaging. The advantages of working in the poststack domain are its numerical efficiency and the reduced computational time. The numerical results show that the proposed method is able to image diffraction objects in complex environments. The application of the method to a real seismic dataset illustrates the capability of the approach to extract diffractions. © 2015 European Association of Geoscientists & Engineers.
Skoulis I.,Opera |
Vassiliadis P.,University of Ioannina |
Zarras A.V.,University of Ioannina
Information Systems | Year: 2015
Like all software systems, databases are subject to evolution as time passes. The impact of this evolution can be vast as a change to the schema of a database can affect the syntactic correctness and the semantic validity of all the surrounding applications. In this paper, we have performed a thorough, large-scale study on the evolution of databases that are part of larger open source projects, publicly available through open source repositories. Lehman's laws of software evolution, a well-established set of observations on how the typical software systems evolve (matured during the last forty years), has served as our guide towards providing insights on the mechanisms that govern schema evolution. Much like software systems, we found that schemata expand over time, under a stabilization mechanism that constraints uncontrolled expansion with perfective maintenance. At the same time, unlike typical software systems, the growth is typically low, with long periods of calmness interrupted by bursts of maintenance and a surprising lack of complexity increase. © 2015 Elsevier Ltd. All rights reserved.
Berkovitch A.,Geomage |
Deev K.,Geomage |
First Break | Year: 2011
MultiFocusing technology can dramatically improve the quality of seismic imaging especially in cases of low fold data, poor signal-to-noise ratio and sparse 3D acquisition. MF technology, based on multiparameter analysis of the wavefield and summation along predicted time surfaces, has been applied to enhance time imaging sections by dramatically increasing the fold of coherent summation of seismic signals. One of the main limitations of the zero-offset MF method is a quasi-hyperbolic approximation for actual travel-time surfaces. COMF traveltime formulas provide an adequate representation of arrival times for arbitrary offset and source-receiver configuration. The COMF correction formula is remarkably accurate even for strong curved reflectors. The correlation procedure is repeated for each imaging point, for each offset and for each time sample. It is important to note that the described procedure can be applied locally within a small vicinity of each seismic trace and does not require global full offset approximation.
Hart's E and P | Year: 2011
Multifocusing (MF) technology, based on multiparameter stacking, has been applied to enhance time imaging sections by dramatically increasing the fold of coherent summation of seismic signals. Implementation of the MF method is technically challenging because it requires defining three moveout parameters in the 2-D case and eight in the 3-D case, as opposed to a single parameter. MF technology was applied to low-fold and low-quality data from northwestern Russia. The MF method not only provides coherent stacking of seismic data with arbitrary source-receiver distribution to create high-quality time images, but it also has the potential to compute enhanced prestack seismic traces. The number and location of traces in the produced supergathers can be different from the input locations, and the resulting traces can be regular with increased signal-to-noise ratio due to partial coherent summation. The method is robust in the presence of non-coherent noise.
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010
Seismic diffractions are the response of important small scale elements in the subsurface such as faults, karsts, fractures. We distinguish between reflective and diffractive contributions to the wavefield and recognize the diffractive component as a key ingredient in establishing resolution. We present past, present and future of using the diffractions for seismic imaging and illustrate it with many interesting and exiting examples © 2010, European Association of Geoscientists and Engineers.