The authors formally define fuzzy multivalued dep.ndencies on a chosen fuzzy database model. Since functional dep.ndencies have already been extended for fuzzy database models earlier, they only deal with an important...
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The authors formally define fuzzy multivalued dep.ndencies on a chosen fuzzy database model. Since functional dep.ndencies have already been extended for fuzzy database models earlier, they only deal with an important integrity constraint, namely multivalued dep.ndencies (MVDs), for the fuzzy relational database introduced by B.P. Buckles and F.E. Petry (1982, 1985). It is shown that the fuzzy MVDs (FMVDs) are consistent and reduce to the classic MVDs when they involve precise attribute values. Some examples are given to show how the integrity constraints imposed by the FMVDs are forced whenever a tuple is to be inserted or to be modified.< >
Power System Stabilizers (PSS) superimposed to the basic control system of an HVDC link supplying a weak AC system, in order to enhance its frequency regulation action, are proposed. To decrease the AC voltage sensiti...
A new method of a microprocessor based pulse-width modulation (PWM) inverter used for uninterruptible power supplies (UPS) is proposed to obtain high-quality sinusoidal output voltage even under a rectifier load. The ...
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The theory of the noisy-leaky integrator model of the neuron is presented and its implementation using pRAMs. Such a neuron is capable of storing temporal patterns of activity within it. With such an ability, a networ...
In this paper, a tracking scheme employing two tracking modes is proposed and its usefulness is confirmed by computer simulations. The simulation results show that our proposed scheme leads to the great improvement of...
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computer Integrated Manufacturing (CIM) systems having determining role in the modern industry. These systems contain essentially two different equipments for transporting materials between workstations: - conveyors c...
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Most discussions of hypertext usability are not founded in empirical measurement but more on conjectures based on personal experience. In this paper we report on two empirical analyses of hypertext usability, focusing...
Most discussions of hypertext usability are not founded in empirical measurement but more on conjectures based on personal experience. In this paper we report on two empirical analyses of hypertext usability, focusing on the quality of links produced by different means. We conducted two experiments to test the predicted relevance and the evaluated relevance of links, that is, where links are evaluated either before or after they are *** order to evaluate these two kinds of relevance, we conducted two experiments where a hypertext document was created from a printed text. In each experiment we compared the relevances of three different sets of links. One set was created by a human author, whereas the second set was created automatically using the HEFTI (Hypertext Extraction From Text Incrementally) model for converting text into hypertext. We also generated a third set of links by assigning links randomly between *** main goal of this research was to develop empirical tests that evaluate the usability of hypertext links. A second goal was to test the validity of automatically generated links using the HEFTI model. In this paper we detail the two experiments, and discuss their implication for methods of hypertext usability assessment and design.
It was recently shown that no data link protocol with finite sequence-numbers and deterministic finite state transmitter and receiver can tolerate transmitter and/or receiver crashes and recoveries, unless they have a...
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A steady-state mathematical model of isotopic fractionation accompanying certain nitrogen transformations in soils is developed. The model takes into account ammonification, nitrification, and immobilization; and pred...
A steady-state mathematical model of isotopic fractionation accompanying certain nitrogen transformations in soils is developed. The model takes into account ammonification, nitrification, and immobilization; and predicts that the 15 N/ 14 N ratios of nitrate and ammonium ion dep.nd in part upon the ratio of the rates of immobilization and ammonification. The ratio of the rates of immobilization to nitrification under field conditions is unlikely to be the same as under the conditions of laboratory incubation experiments. Therefore, this prediction provides a possible explanation for differences observed between the 15 N/ 14 N ratio of nitrate extracted from soil cores and that of nitrate released during laboratory incubation of the same soils. The model described is ammenable to experimental test. If verified, an expanded version of the model may be a useful aid in the study of nitrogen transformations in the field.
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