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http://hdl.handle.net/2440/292
Sat, 30 May 2015 02:04:43 GMT2015-05-30T02:04:43ZHistogram probabilistic multi-hypothesis tracker with colour attributes
http://hdl.handle.net/2440/91375
Title: Histogram probabilistic multi-hypothesis tracker with colour attributes
Author: Davey, S.J.; Vu, H.X.; Arulampalam, S.; Fletcher, F.; Lim, C.C.
Abstract: The histogram probabilistic multi-hypothesis tracking (H-PMHT) algorithm is a multi-target track-before-detect method that has been demonstrated to be scalable and efficient and shows good performance on video imagery. However, its application has been limited to intensity-only imagery. In practice, colour and information, such as texture, are often available and can be very helpful when targets are close together. This study compares two alternative methods that incorporate colour information in the H-PMHT: an existing method referred to as spectral H-PMHT and a new approach that treats the colour information as attribute data. The methods are compared with intensity-only H-PMHT on simulations and benchmark data from the VS-PETS03 archive.Wed, 31 Dec 2014 13:30:00 GMThttp://hdl.handle.net/2440/913752014-12-31T13:30:00ZConsistency of probability decision rules and its inference in probability decision table
http://hdl.handle.net/2440/91348
Title: Consistency of probability decision rules and its inference in probability decision table
Author: Pei, Z.; Zou, L.; Karimi, H.R.; Shi, P.
Abstract: In most synthesis evaluation systems and decision-making systems, data are represented by objects and attributes of objects with a degree of belief. Formally, these data can be abstracted by the form (objects; attributes; P), where P represents a kind degree of belief between objects and attributes, such that, P is a basic probability assignment. In the paper, we provide a kind of probability information system to describe these data and then employ rough sets theory to extract probability decision rules. By extension of Dempster-Shafer evidence theory, we can get probabilities of antecedents and conclusion of probability decision rules. Furthermore, we analyze the consistency of probability decision rules. Based on consistency of probability decision rules, we provide an inference method to finish inference of probability decision rules, which can be used to decide the class of a new object . The conclusion points out that the inference method of the paper not only deals with precise information, but also imprecise or uncertain information as well.
Description: Research articleSat, 31 Dec 2011 13:30:00 GMThttp://hdl.handle.net/2440/913482011-12-31T13:30:00ZCylindrical RF network antennas for coupled plasma sources copper legs delayed in time system stability analysis
http://hdl.handle.net/2440/91320
Title: Cylindrical RF network antennas for coupled plasma sources copper legs delayed in time system stability analysis
Author: Aluf, O.
Abstract: In this article, Very Crucial subject discussed cylindrical (closed) RF network antennas for coupled plasma sources copper legs delayed in time system stability analysis. Resonant RF network antennas are important to plasma sources with many applications. The cylindrical resonant RF network antennas run as large volume plasma sources and have stability switching due to system's copper legs parasitic effects. The cylindrical RF network antenna structure is 16-leg cylindrical (Birdcage) RF antenna which has electrical circuit and opposite points of RF feeding and grounding. The vacuum vessel is a glass cylinder closed at the top and bottom by grounding metal plates. Generally there are two popular different resonant RF network assemblies: a cylindrical and a planar RF antenna. The cylindrical RF antenna is built as a high-pass Birdcage coil. The antenna is mounted outside a glass tube. The RF antenna consists of 16 copper legs equally spaced interconnected with capacitors. Due to RF antenna copper leg parasitic effect we get copper leg's current and current derivative with delay tau1-k and tau2-k (k is leg number index, k=1,...,16). The uncooled antenna is fed at the midpoint and operated with opposite grounded. Alternatively, it can be fed by another transmitter unit. Due to cylindrical antenna parasitic delayed in time, there is a stability issue by analyzing its operation. We consider for simplicity that all copper leg's current parasitic time delayed are equal (tau₁-₁= tau₁-₂=... =tau₁-₁₆) and current derivative parasitic time delayed are equal (tau₂-₁= tau₂-₂=... =tau₂-₁₆). The cylindrical RF network antennas delayed in time equivalent circuit can represent as a delayed differential equations which depend on variable parameters and delays. The investigation of our cylindrical network antenna with copper leg system, a differential equation is based on bifurcation theory [1], a study of possible changes in the structure of the orbits of a delayed differential equation depending on variable parameters. Cylindrical RF network antenna analysis is done under two series of different time delays respect to antenna's copper legs current and current derivative. All of that for optimization of a cylindrical RF network antenna circuit parameter analysis to get the best performance. The cylindrical network antenna with copper leg system can be represented as delayed differential equations which, depending on variable parameters and delays. There is a practical guideline that combines graphical information with analytical work to effectively study the local stability of models involving delay dependent parameters. The stability of a given steady state is determined by the graphs of some function of tau і-₁, ..,tau i-₁₆ (i=1, 2) [2] [3] [4].Tue, 31 Dec 2013 13:30:00 GMThttp://hdl.handle.net/2440/913202013-12-31T13:30:00ZPerformance of token ring protocols for real-time message transmission
http://hdl.handle.net/2440/91316
Title: Performance of token ring protocols for real-time message transmission
Author: YAO, L.J.; ZHAO, W.; LIM, C.C.
Abstract: We study the average case performance of three token ring protocols through simulation. The first is the token passing protocol which does not adhere to the EDF policy but has a minimal overhead. The second is a modified priority-driven protocol which only approximates the EDF policy with a moderate overhead. The third is the window protocol which implements the exact EDF policy, but its contention overhead might be potentially high. It is found that under the current network technology, the window protocol achieves the best performance in supporting urgent real-time messages. We have also noted that when the ring gets faster, the difference in the performance of the three protocols is reduced. Therefore, the average case performance of a real-time protocol is determined by both the transmission policy employed and the contention overhead incurredFri, 31 Dec 1993 13:30:00 GMThttp://hdl.handle.net/2440/913161993-12-31T13:30:00Z