We illustrate the use of the recent approach by P. Albrecht to the derivation of order conditions for partitioned Runge-Kutta methods for ordinary differential equations.
We illustrate the use of the recent approach by P. Albrecht to the derivation of order conditions for partitioned Runge-Kutta methods for ordinary differential equations.
We study an important subclass of quasicircles, namely, symmetric quasicircles. Several characterizations for quasicircles, such as the reverse triangle inequality, the M-condition and the quasiconformal extension pro...
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We study an important subclass of quasicircles, namely, symmetric quasicircles. Several characterizations for quasicircles, such as the reverse triangle inequality, the M-condition and the quasiconformal extension property, have been extended to symmetric quasicircles by Becker and Pommerenke and by Gardiner and Sullivan. In this paper we establish several relations among various domain constants such as quasiextremal distance constants, (local) reflection constants and (local) extension constants for this class. We also give several characterizations for symmetric quasicircles such as the strong quadrilateral inequality and the strong extremal distance property. They correspond to the quadrilateral inequality and the extremal distance property for quasicircles.
A multiprogrammed (or partitionable) parallel computer system can be partitioned into subsystems which are allocated to independent jobs. The performance of such a parallel processing system is determined by the syste...
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A multiprogrammed (or partitionable) parallel computer system can be partitioned into subsystems which are allocated to independent jobs. The performance of such a parallel processing system is determined by the system partitioning strategy and the job scheduling policy adopted. In this paper, we consider the impact of a job scheduling algorithm on the system performance, mainly the average job response time. A refined First-Come-First-Serve (FCFS) queueing discipline called FCFS/SJE is studied, which, when there are not enough processors available for large jobs in the front of a waiting queue, schedules small jobs behind these large jobs earlier. We develop a multi-server queueing system for modelling multiprogrammed parallel processing systems. A system is specified by the number of processors and jobs are characterized by a probability distribution of the number of processors requested, a Poisson arrival process, and an exponential distribution of execution time. Our analysis as well as simulation indicate that FCFS/SJE results in a noticeable improvement on system performance compared with FCFS.
It is well known that for the case of a countable partial order, the ideal completion and the chain completion coincide. We investigate the boundary at which the chain and ideal completion do not coincide. We show in ...
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We investigate the asymptotic behavior, the oscillatory character, and the periodic nature of solutions of the difference equation xn+1 = max{xn, A}/xnxn-1, n = 0, 1, . . . where A is a real parameter and the initial ...
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We investigate the asymptotic behavior, the oscillatory character, and the periodic nature of solutions of the difference equation xn+1 = max{xn, A}/xnxn-1, n = 0, 1, . . . where A is a real parameter and the initial conditions are arbitrary nonzero real numbers.
The study of the shapes of sedimentary particles was presented. The shape of the particle was described by using the roundness as the measurement factor. The analysis study utilized a Fourier transform method to obtai...
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ISBN:
(纸本)0964345692
The study of the shapes of sedimentary particles was presented. The shape of the particle was described by using the roundness as the measurement factor. The analysis study utilized a Fourier transform method to obtain coordinates on the edge of the profile of the fragment being measured. The proposed method described the difference between the low pass filtered radii and original radii as the measure of roundness.
A weak decomposition of an incompletely specified function f is a decomposition of some completion of f. Using a graph-theoretical characterization of functions that admit such decompositions, we present a technique d...
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A weak decomposition of an incompletely specified function f is a decomposition of some completion of f. Using a graph-theoretical characterization of functions that admit such decompositions, we present a technique derived from the a priori algorithm that allows a data mining approach to identifying these decompositions.
In order to model and analyze the data traffic behaviors with feedback mechanism in high-speed data communication system, we start from the feedback control model proposed by Rauf Izmailov, which is based on different...
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In order to model and analyze the data traffic behaviors with feedback mechanism in high-speed data communication system, we start from the feedback control model proposed by Rauf Izmailov, which is based on differential delay equations. But, instead of specifying the processing rate to be constant, we extend it to a general functional model. We also add a random item for describing the uncertainties in a real communication system. We analyze the stability and robust stability of systems with these models. Theoretically the results show that the system can be stabilized and that the buffer size can be controlled even if the system is suffering from a large delay or has variations in its delay, or if some other uncertain situations are present.
The electronic markets vs. electronic hierarchies debate initiated by (Malone et al. 1987) has been superseded by the discussion about dis- or reintermediation in the electronic marketplace. Many of the arguments give...
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The electronic markets vs. electronic hierarchies debate initiated by (Malone et al. 1987) has been superseded by the discussion about dis- or reintermediation in the electronic marketplace. Many of the arguments given for either side are equally correct - because the arguments have been applied to different domains in different situations from specific perspectives - and yet the debate falls short of covering the complexity and dynamics of the ongoing market structure change. The goal of this paper is therefore to develop a more differentiated framework that facilitates the understanding of chances and threats resulting from inter- and cybermediation. The framework suggests to distinguish roles, opportunities and threats for cybermediaries in different situations. While the framework is meant to structure the debate in general, we will focus on public sector procurement to show its application.
The paper presents an approach for establishing correspondences in time and in space between two different video sequences of the same dynamic scene, recorded by stationary uncalibrated video cameras. The method simul...
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The paper presents an approach for establishing correspondences in time and in space between two different video sequences of the same dynamic scene, recorded by stationary uncalibrated video cameras. The method simultaneously estimates both spatial alignment as well as temporal synchronization (temporal alignment) between the two sequences, using all available spatio-temporal information. Temporal variations between image frames (such as moving objects or changes in scene illumination) are powerful cues for alignment, which cannot be exploited by standard image-to-image alignment techniques. We show that by folding spatial and temporal cues into a single alignment framework, situations which are inherently ambiguous for traditional image-to-image alignment methods, are often uniquely resolved by sequence-to-sequence alignment. We also present a "direct" method for sequence-to-sequence alignment. The algorithm simultaneously estimates spatial and temporal alignment parameters directly from measurable sequence quantities, without requiring prior estimation of point correspondences, frame correspondences, or moving object detection. Results are shown on real image sequences taken by multiple video cameras.
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