Today, a huge amount of unstructured tabular data is contained in tables from different sources, e.g. image documents, web pages, and spreadsheets. Sometimes these tables are only available data source. To use that in...
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Today, a huge amount of unstructured tabular data is contained in tables from different sources, e.g. image documents, web pages, and spreadsheets. Sometimes these tables are only available data source. To use that information in business intelligence we need to transform data from these tables to structured form like relational databases. We propose an approach to the tabular data transformation from unstructured (spreadsheets) to structured (relational databases) form using a rule engine. Our table interpretation rules can use spatial, style (typographical), and natural language information from tables. The experimental evaluation shows that the approach can be applied to a wide range of tables from statistical and financial reports.
The paper describes the background and prospects of the development of the spatial data infrastructure (SDI) in the scientific institutions of the Mongolian Academy of Sciences (MAS). This paper also discusses the int...
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The paper describes the background and prospects of the development of the spatial data infrastructure (SDI) in the scientific institutions of the Mongolian Academy of Sciences (MAS). This paper also discusses the integration of information resources for the development of SDI. Some original technological solutions are proposed for building SDI in the MAS based on international standards.
The preprocessing of positively-constructed formulas (PCFs) for automatic deduction search algorithms is considered in this paper. A new efficient algorithm for conversion of the predicate calculus language formulas t...
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ISBN:
(纸本)9781509025435
The preprocessing of positively-constructed formulas (PCFs) for automatic deduction search algorithms is considered in this paper. A new efficient algorithm for conversion of the predicate calculus language formulas to the language of PCFs and equivalent rules of reducing PCFs, preserving the original heuristic structure of knowledge represented by the formulas of the predicate calculus language, are presented.
The problem of numerical finding of a Nash equilibrium in a polymatrix game is considered. Such a game turns out to be equivalent to the solving a nonconvex optimization problem with a bilinear structure in the object...
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ISBN:
(纸本)9789616165457
The problem of numerical finding of a Nash equilibrium in a polymatrix game is considered. Such a game turns out to be equivalent to the solving a nonconvex optimization problem with a bilinear structure in the objective function. Special methods of local and global search for the 3-player game are proposed and investigated.
Here we address two optimization problems: the search for Nash equilibria in polymatrix games and the quadratic-linear bilevel programming problem. It can be shown that each of the problems possesses a hidden nonconve...
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ISBN:
(纸本)9789616165457
Here we address two optimization problems: the search for Nash equilibria in polymatrix games and the quadratic-linear bilevel programming problem. It can be shown that each of the problems possesses a hidden nonconvexity and, as a consequence, a rather large number of local solutions which are different from global ones. Further, the principal elements of Global Search theory are sketched. Finally, we present the results of computational solutions.
In this paper we propose the technology for integrating idle computing cluster resources into volunteer computing projects. The main principles of this technology are the following: only standard cluster user rights a...
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In this paper we propose the technology for integrating idle computing cluster resources into volunteer computing projects. The main principles of this technology are the following: only standard cluster user rights and only idle computing cluster resources (i.e. the resources that are not employed by other cluster users) are used. We describe the CluBORun tool implementing this technology for BOINC-based volunteer computing projects. The CluBORun tool was successfully applied to boost the performance of volunteer computing projects SAT@home and OPTIMA@home.
A degenerate nonlinear parabolic-type equation with a specified source function is solved. Boundary value problems for various kinds of boundary conditions are considered. Solution algorithms based on the boundary ele...
A degenerate nonlinear parabolic-type equation with a specified source function is solved. Boundary value problems for various kinds of boundary conditions are considered. Solution algorithms based on the boundary element method are constructed. Some examples are discussed. The comparison of the obtained BEM solutions with known exact solutions gives good results.
In the article we develop an approach to the study of nonlinear problems of mathematical physics, proposed in A. F. Sidorov’s school of thought, and apply it to solving boundary value problems with degeneracy for the...
In the article we develop an approach to the study of nonlinear problems of mathematical physics, proposed in A. F. Sidorov’s school of thought, and apply it to solving boundary value problems with degeneracy for the nonlinear heat (porous medium) equation. The essence of the approach is that the solution of problems is constructed in the form of multiple power series. The convergence of the constructed series is proved by the majorant method. It allows us to propose the existence and uniqueness theorem, which is analogous to the Cauchy-Kovalevskaya theorem for the considered problem. A constructive scheme for finding the coefficients of the series is proposed. A special feature of the study is that the boundary condition is given on a moving closed manifold.
The paper gives a clue to solving a well-known "singularity problem" of power gyrosystems, i.e. to developing smoothly implemented by gyrodines steering control laws for the operational modes of the object. ...
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ISBN:
(纸本)9785919950233
The paper gives a clue to solving a well-known "singularity problem" of power gyrosystems, i.e. to developing smoothly implemented by gyrodines steering control laws for the operational modes of the object. We believe that this clue is kinematic configuring of control gyrodines systems, viz. single-axis non-restrained gyros. It implies virtual (programmable) constraining for the precession rates of gyro units in addition to choosing the relative position of spin (precession) axes of their gyromotors (gyronodes). Traditional "geometric" configuring is restricted to this factor, by the way. Reliability verification to solve the singularity problem with the proposed method is based on ensuring controllability of the boundary conditions in the problem of the spacecraft re-orientation with the help of virtually synchronized precession rates of the gyro units. A simple working example is provided for the basic idea not to be overlooked.
A nonlinear second-order parabolic equation with two variables is considered. Under additional conditions, this equation can be interpreted as the porous medium equation in case of dependence of the unknown function o...
A nonlinear second-order parabolic equation with two variables is considered. Under additional conditions, this equation can be interpreted as the porous medium equation in case of dependence of the unknown function on two variables: time and distance from the origin. The equation has a wide variety of applications in continuum mechanics, for example, it is applicable for mathematical modeling of filtration of ideal polytropic gas in porous media or heat conduction. The authors deal with a special solutions which are usually called heat waves. A special feature of such solution is that it consists of two continuously joined solutions. The first of them is trivial and the second one is nonnegative. The heat wave solution can have discontinuous derivatives on the line of joint which is called the front of heat wave, i.e. smoothness of the solution, generally speaking, is broken. The most natural problem which has such solutions is the so-called 'the Sakharov problem of the initiation of a heat wave'. New solutions of the problem in the form of multiple power series for physical variables are constructed. The coefficients of the series are obtained from tridiagonal systems of linear algebraic equations. Herewith, the elements of matrices of this systems depend on the matrix order and the condition of the diagonal dominance is not fulfilled. The recurrent formulas for the coefficients are suggested.
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