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Search Results: 1 - 10 of 8019 matches for " Glüge "
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BANDWIDTH REDUCTION ON SPARSE MATRICES BY INTRODUCING NEW VARIABLES
Glüge,Rainer;
Ingeniare. Revista chilena de ingeniería , 2010, DOI: 10.4067/S0718-33052010000300013
Abstract: a sparse matrix bandwidth reduction method is analyzed. it consists of equation splitting, substitution and introducing new variables, similar to the substructure decomposition in the finite element method (fem). it is especially useful when the bandwidth cannot be reduced by strategically interchanging columns and rows. in such cases, equation splitting and successive reordering can further reduce the bandwidth, at cost of introducing new variables. while the substructure decomposition is carried out before the system matrix is built, the given approach is applied afterwards, independently on the origin of the linear system. it is successfully applied to a sparse matrix, the bandwidth of which cannot be reduced by reordering. for the exemplary fem simulation, an increase of performance of the direct solver is obtaine.
BANDWIDTH REDUCTION ON SPARSE MATRICES BY INTRODUCING NEW VARIABLES REDUCCIóN DEL ANCHO DE BANDA DE MATRICES DISPERSAS MEDIANTE LA INTRODUCCIóN DE NUEVAS VARIABLES
Rainer Glüge
Ingeniare : Revista Chilena de Ingeniería , 2010,
Abstract: A sparse matrix bandwidth reduction method is analyzed. It consists of equation splitting, substitution and introducing new variables, similar to the substructure decomposition in the finite element method (FEM). It is especially useful when the bandwidth cannot be reduced by strategically interchanging columns and rows. In such cases, equation splitting and successive reordering can further reduce the bandwidth, at cost of introducing new variables. While the substructure decomposition is carried out before the system matrix is built, the given approach is applied afterwards, independently on the origin of the linear system. It is successfully applied to a sparse matrix, the bandwidth of which cannot be reduced by reordering. For the exemplary FEM simulation, an increase of performance of the direct solver is obtaine. Se analiza un método para la reducción del ancho de banda de matrices dispersas, el cual consiste en fraccionar ecuaciones, substituir e introducir nuevas variables, similar a la descomposición en subestructuras utilizada en el método de los elementos finitos (FEM). Es especialmente útil si el ancho de banda no puede ser reducido intercambiando estratégicamente columnas y líneas. En estos casos, dividir ecuaciones y reordenar líneas y columnas puede reducir el ancho de banda, al costo de introducir nuevas variables. En comparación con el método de las subestructuras en el FEM, en el cual la descomposición está hecha antes de obtener la matriz del sistema, la metodología que se presenta está aplicada después de obtener el sistema lineal, independiente de su origen. El método está aplicado con éxito en una matriz dispersa en el contexto del FEM, lo cual resulta en un aumento de eficiencia del algoritmo directo para resolver el sistema lineal.
On network representations of antennas inside resonating environments
F. Gronwald,S. Glüge,J. Nitsch
Advances in Radio Science : Kleinheubacher Berichte , 2007,
Abstract: We discuss network representations of dipole antennas within electromagnetic cavities. It is pointed out that for a given configuration these representations are not unique. For an efficient evaluation a network representation should be chosen such that it involves as few network elements as possible. The field theoretical analogue of this circumstance is the possibility to express electromagnetic cavities' Green's functions by representations which exhibit different convergence properties. An explicit example of a dipole antenna within a rectangular cavity clarifies the corresponding interrelation between network theory and electromagnetic field theory. As an application, current spectra are calculated for the case that the antenna is nonlinearly loaded and subject to a two-tone excitation.
Stress Infantil e Desempenho Escolar: avalia??o de crian?as de 1a a 4a série de uma escola pública do município de S?o Paulo
Lemes, Sandra Ozeloto;Fisberg, Mauro;Rocha, Gláucia M.;Ferrini, Luciana G.;Martins, Geórgia;Siviero, Karina;Ataka, Marcos A.;
Estudos de Psicologia (Campinas) , 2003, DOI: 10.1590/S0103-166X2003000100001
Abstract: the objective of this article was to evaluate stress in children (1tst to 4th grade ) at a public school in s?o paulo city and also to study the correlation between the presence or absence of stress and the children's school performance. 342 children were evaluated through the esi (escala de stress infantil) and their school performance was assessed on the basis of the average grade (a, b, c, d or e) given by their teachers in seven different subjects. for statistical purposes, the average school performance grades were defined as: a-strong; b-medium; c-weak. the results did not show differences that were statistically significant. however, they showed that 30,1% of the children had stress symptons and 38,2% of the children who had stress had also weak school performance.
Existence and Nonexistence of Global Solutions of a Fully Nonlinear Parabolic Equation  [PDF]
Zhihao Ge
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.31004
Abstract: In the paper, we study the global existence of weak solution of the fully nonlinear parabolic problem (1.1)-(1.3) with nonlinear boundary conditions for the situation without strong absorption terms. Also, we consider the blow up of global solution of the problem (1.1)-(1.3) by using the convexity method.
Research on Serving the Development of Regional Economy Innovation by Intellectual Properties in Universities  [PDF]
Ge Li
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.23005
Abstract:

At present, a sound intellectual property management and service system have not been established yet in Chinese colleges and universities. Meanwhile, the lost of existing intellectual property in universities due to small amount, low conversion rate, low technology content and weak brand awareness, hinders the positive effect of intellectual property and affects its transformation and application in China. This article introduces the current problems with intellectual property in universities and gives some countermeasures to promote the use of intellectual property in universities for a better regional economic service.

The Property of a Special Type of Exponential Spline Function  [PDF]
Ge Yang
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.513074
Abstract: Approximation theory experienced a long term history. Since 50’ last century, the rise of spline function as well as the advance of calculation promotes the growth of classical approximation theory and makes them develop a profound theory in maths, and application values have shown among the field of scientific calculation and engineering technology and etc. At present, the study of spline function had made a great progress and had a lot of fruits, as for that, the reader could look up the book [1] or [2]. Nevertheless, the research staff pays less attention to exponential spline function, since polynomial spline function is a special case of that, so it is much essential and meaningful for one to explore the nature of exponential spline function.
SWOT Analysis of Central Economical Zone Developing E-Commerce—Take Henan for Example  [PDF]
Fengna Ge
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.63065
Abstract: Central economical zone is an important part of China’s regional economy. As a new growth pole, it will have a programmatic guidance to the reconstruction of the regional economy territory. Its development will have a significant positive impact on our country. To grasp opportunities and develop, we must start from the reality of the province and develop e-commerce, making it become the new economic growth point. This article utilizes the SWOT analysis and combines internal and external environment of electronic commerce, pointing out opportunities and threats that Henan face when developing electronic commerce.
Reflection and Innovation of Undergraduate Teaching in E-Commerce  [PDF]
Fengna Ge
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.76077
Abstract: As a technical and commercial revolution, e-commerce has an impact on the development of social economy more and more profoundly, and changes men’s business model and lifestyle fundamentally. Shortages of talents on e-commerce have become a “bottleneck” restricting China’s e-commerce development. However, undergraduate teachings in e-commerce have some shortcomings. Out of line with social demands, trainings for talents are of low quality. Therefore, reflecting problems of current undergraduate teachings in e-commerce, thus to explore solutions to these problem is undoubtedly of great theoretical and practical significance.
A Study on Improving of Incubating-Efficiency of Incubators in Zhejiang Province, China  [PDF]
Zhenfeng Ge
iBusiness (IB) , 2018, DOI: 10.4236/ib.2018.103009
Abstract: The incubator’s promotion of entrepreneurial development and the help of N.E. growth make its research have a strong practical significance. At the same time, concern for the sustainability of incubator development, the core of the problem lies in the ability to configure their incubator resources, that is, the level of incubating-efficiency. By DEA, HAC, In-depth interviews to discuss the situation in Zhejiang Province incubators, as well as influencing factors on incubating-efficiency and the improving path of the sample derived from the incubator in Zhejiang Province, which proposed a new hierarchical model and incubation Strategies for improving of incubating-efficiency.
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