Showing papers on "Uncertain data published in 1979"
01 Aug 1979
TL;DR: In this article, a stochastic approach for modeling uncertain and incompletely known ecosystems, using a lake modeling example, is proposed, in order to estimate the reliability and precision of model predictions based on uncertain data from ecological systems, the explicit inclusion of the uncertainty in numerical modeling approach is advocated.
Abstract: A stochastic approach for modeling uncertain and incompletely known ecosystems, using a lake modeling example, is proposed. In order to estimate the reliability and precision of model predictions based on uncertain data from ecological systems, the explicit inclusion of the uncertainty in the numerical modeling approach is advocated. Starting with a fuzzy definition of systems behavior in terms of a behaviour space region, the corresponding region in the data space of a given model is explored by Monte Carlo techniques. A set of data vectors -- random samples from the data space region corresponding to the empirical range of systems behaviour -- is then used to generate independent estimates of states or outputs for selected deterministic inputs. These estimates have to be understood as random samples from a probabilistic behaviour space which reflects the initial uncertainty in data space delimitation. The estimates are used to establish probability distributions for systems states or outputs (cross-sections of the probabilistic behaviour space) for the given input conditions. These probability distributions replace the deterministic point-estimates of a traditional approach, and reflect the incomplete knowledge about the system as well as the stochastic variability of ecosystems. The approach is extended for long-term simulations of systems behavior under changed input conditions, and estimates of prediction accuracy in time are obtained.
4 citations
Patent•
27 Sep 1979
TL;DR: In this paper, the authors present an analog data conversion scheme for two main tracks and a reserve track, where the correspondences between the appropriate part of the data of the main track and the data on the reserve track are established.
Abstract: The apparatus and technique of analog data conversion, audio signal Preferably, in digital information, digital information is preferably recorded from two main separate channels (11, 12) on the main tracks (22a, 22b) and a third reserved track or track (22c) to be saving pieces or the most important parts of this information saves e on the main tracks. The apparatus and techniques of the invention are applicable to each group of data on each main track and the reserve track; it also consists of controlling (27) codes the synchronization disposed between the data groups and controlling (30) the correspondence between the appropriate part of the data of the main track and the data on the reserve track, with, where potentially false or uncertain data are detected, the invention establishes a comparison data packs of the main track and the reserve track (31) to determine what is the correct one or, in the case where no data packs not perhaps judge as correct, the device provides the last substitution or correct the data integration between the correct data. The invention preferee incorporates the synchronization signal input to the statibilisation of data, and a system of first input circuits - the first outlet (32) at the output to reduce the effects of wow and fluctuation to produce a digital conversion / analogue of very good quality to transmit to a system of loudspeakers.
1 citations