به نام خدا
Title: Electron repulsion integrals for self-energy calculations
Authors: Y Pavlyukh , J Berakdar
Abstract: A fast algorithm for the calculation of the electron repulsion integrals in an atomic basis is a prerequisite of any ab initio quantum chemistry method. Unlike the case of a self-consistent field (SCF) approach, correlated methods often require a full or partial integral transformation to the molecular basis. The run- time of such an algorithm scales unfavorably as O(N ? where N ? is the number of the basis function, and additionally poses high requirements on the computer memory. The problem is aggravated in the case of large highly symmetric molecules which can only be modeled by fully taking the symmetry into account (as was recently demonstrated by us in J. Chem. Phys. 135 (2011) 201103). Wedescribe here the algorithm for the calculation of the electron repulsion integrals, the transformation and their use in the correlated Green s function approach for systems with icosahedral symmetry.
Publish Year: 2013
Published in: Computer Physics Communications - Science Direct
Number of Pages: 9
موضوع: فیزیک
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حامی دانش بومی ایرانیان
به نام خدا
Title: Clustering via geometric median shift over Riemannian manifolds
Authors: Yang Wang, Xiaodi Huang, Lin Wu
Abstract: The mean shift algorithms have been successfully applied to many areas, such as data clustering, feature analysis, and image segmentation. However, they still have two limitations. One is that they are ineffective in clustering data with low dimensional manifolds because of the use of the Euclidean distance for calculating distances. The other is that they some- times produce poor results for data clustering and image segmentation. This is because a mean may not be a point in a data set. In order to overcome the two limitations, we pro- pose a novel approach for the median shift over Riemannian manifolds that uses the geo- metric median and geodesic distances. Unlike the mean, the geometric median of a data set is one of points in the set. Compared to the Euclidean distance, the geodesic distances can better describe data points distributed on Riemannian manifolds. Based on these two facts, we first present a novel density function that characterizes points on a manifold with the geodesic distance. The shift of the geometric median over the Riemannian manifold is derived from maximizing this density function. After this, we present an algorithm for geo- metric median shift over Riemannian manifolds, together with theoretical proofs of its cor- rectness. Extensive experiments have demonstrated that our method outperforms the state-of-the-art algorithms in data clustering, image segmentation, and noise filtering on both synthetic data sets and real image databases.
Publish Year: 2013
Published in: Information Sciences - Science Direct
Number of Pages: 14
موضوع: منیفولد (Manifold )
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حامی دانش بومی ایرانیان
به نام خدا
Title: A Structural Analysis of Emerging Production Systems
Authors: Luis Ribeiro, Rogrio Rosa, Jos Barata
Abstract: A cornerstone of modern production paradigms is the encapsulation of heterogeneity and system complexity. This functional encapsulation is supported by distinct architectural building blocks that once instantiated abstract, manage and control a specific system. Modern production approaches rely in semi hierarchical architectures to organize the interactions between these blocks. In runtime this specific structure promotes a self-organizing response resulting from concurrent interaction between the system�s components. This paper simulates the execution of processes in a network of mechatronic agents comprising products, processes� abstractions and resources and analyses the impact of the typical network structure envisioned by modern production paradigms in respect to the time consumed in the production process.
Publish Year: 2012
Published in: INDIN - IEEE
Number of Pages: 6
موضوع: مکاترونیک
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حامی دانش بومی ایرانیان
به نام خدا
Title: Integration of Face Recognition and Sound Localization for a Smart Door Phone System
Authors: Taewan Kim, Hyungsoo Park, and Yunmo Chung
Abstract: This paper proposes a smart system using both face recognition and sound localization techniques to identify the faces of visitors from a door phone in much efficient and accurate ways. This system is effectively used to recognize the faces when their locations are out of the boundaries of the camera scope of the door phone. The smart door phone system proposed in this paper uses a visitor’s voice source to rotate the camera to his face and then to recognize the face accurately. The integrated system has been designed with one FPGA(Field Programmable Gate Array) chip and tested for actual use in door phone environments.
Publish Year: 2013
Published in: ICCE - IEEE
Number of Pages: 2
موضوع: تشخصی چهره و صدا
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حامی دانش بومی ایرانیان
به نام خدا
Title: Design of a Mastering System for Digital Cinema
Authors: Yeonjeong Jeong, Bumho Kim, Kisong Y oon
Abstract: Digital Cinema Initiatives released a set of technical specifications and requirements for Digital Cinema. The mastering system of digital cinema produces the Digital Cinema Package (DCP) which has been designed to deliver digital cinema contents such as image, audio and subtitle between Digital Cinema content processing centers. We propose a mastering system that covers the packaging process of DCP for Digital Cinema content and protection of it.
Publish Year: 2013
Published in: ICACT - IEEE
Number of Pages: 5
موضوع: سینمای دیجیتال
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان
