Artificial neural network (ANN) model has been used for years to conduct research in stock price prediction for three reasons. First, it has a higher prediction accuracy rate in empirical research. Second, it is not subject to the assumption of having samples from a normal distribution. Third, it can deal with non-linear problems. Nevertheless, the accuracy of prediction relies on the parameter settings of neural network as well as the complexities of problems and the neural network architecture; the results of the analysis could be even more significant with the selection of optimal parameters and network architecture. Currently, as a way of setting parameters, most researchers employed the trial and error method. However, this method is very time-consuming and labor-intensive and may not result in the optimal parameters. Therefore, this research took advantage of a back propagation neural network (BPNN) for the purpose of parameter optimization through constructing a model of stock price prediction, applying design of experiment (DOE) to systematize experiment scheduling, and methods of main effects analysis and interaction analysis. The research used two datasets of financial ratios from 50 blue chip companies in Taiwanese stock market and 40 listed American banks in New York stock exchange as experimental samples. Research results showed that the correlation forecasting, root mean squared error (RMSE), and computing time, which can effectively increase the accuracy of stock price prediction, are better than traditional statistical methods and conventional neural network model.
One of the most recent and perspective gas detectors is a smart wave\-guide acoustic detector, in which chromatogram represents the mass concentration of the gas to be detected. On the other hand, with respect to design criterions and limits (cost and size), an alternative numerical-based detector has been designed, using a multi-layer perceptron neural network to estimate the frequency and mass concentration of the unknown gas (sample). Experimental data were used for designing the database of the neural network-based detector. The proposed NN-based detector was compared with the real one to validate the proposal. Finally, numerical results were obtained to evaluate its performance.
A model for the design of rectangular microstrip antennas, based on
artificial neural networks, is presented. The multiple output design parameters are calculated by using only one network. The extended delta-bar-delta algorithm is used to train the network. The neural model is simple and is useful for the computer-aided design (CAD) of microstrip antennas. The design results obtained by using the neural model are in very good agreement with the results available in the literatuře.
This paper is devoted to robust gain scheduled PID controller design with L2 performance for the linear time varying (LPV) uncertain system with polytopic uncertainties. The novel approach of robust controller design ensures that the obtained design procedure is convex with respect to both plant uncertainties (polytopic system) and gain scheduling parameters and gives less conservative results. Modified design procedure should be used to obtain a robust controller or robust switched controller (ideal, non-ideal switching) with arbitrarily switching algorithm. The effectiveness of the proposed approach is illustrated on the simulation examples.
We have been asked to design and manufacture a wide-field and fast photographic camera for many times in the past. The manufacture of these devices mostly was not realized because the customers finally bought a commercial Newtonian telescope and fitted it by a field corrector. The manufacture of a fast first class camera requires great accuracy and takes a lot of time. That is the main reason why the prices of these devices are very high. The good results can be obtained with the cameras based on the aspherical plates of commercial Schmidt-Cassegrain telescopes. In this paper we publish several designs of optical systems composed of a corrector plate of commercial eight inch Schmidt-Cassegrain telescope and a new mirror part. and V minulosti jsme byli mnohokrát žádáni o návrh a výrobu světelné širokoúhlé fotografické komory. Výroba těchto přístrojů nebyla realizována, protože zákazníci si nakonec koupili komerční Newtonův dalekohled a vybavili jej korektorem pole. Výroba kvalitní světelné komory vyžaduje vysokou přesnost optické a mechanické práce a zabere mnoho času. To je hlavní důvod, proč jsou ceny těchto přístrojů vysoké. Dobré výsledky mohou být získány s komorami založenými na asférických deskách komerčních Schmidtových-Cassegrainových dalekohledů. V této práci publikujeme několik návrhů optických přístrojů s korekční deskou komerčního osmipalcového dalekohledu typu Schmidt-Cassegrain a nově dopočítané zrcadlové části.
The design, build and test of a re-programmable neural switch (RNS) are carried out. The function of such a switch is to operate as a synaptic processor behaving in an adaptive manner and suitable to be used as a compact programmable device with other artificial neural network hardware. Interaction between constituent materials forming the switch is discussed and carrier interaction during the Programming cycles is explained. Programmability of the switch is proved to be bi-directional and reversible with hysteresis effect which is due to excess charge storage.
The present paper is a reply to the article Perspektivy korpusové lingvistiky: deskripce, nebo explanace by František Štícha (2015) which is a critique of recent studies by Radek Čech (2014) and Jan Chromý (2014). It is shown that Štícha’s argumentation is based on an inaccurate reading of the two criticized studies. Also, Štícha’s conception of corpus linguistics as a discipline which aims to capture the morphological and syntactical norm of well-educated people is rather limited. This narrow-minded view seems to be another reason of Štícha’s misunderstanding of the criticized papers.
The article deals with geodynamical phenomena of marginal parts of sandstone plateaus. The area of interest consists of several partial areas in the Bohemian Paradise natural reserve. These areas rise above terrain as relics of a once uniform sandstone plateau. The current relief developed mainly in the Pleistocene, when the Jizera River carved present day wide valley and the underlying soft clay rocks were uncovered. Thus favorable conditions were created for slow destruction of sandstone plateaus. Here, the slope movements occur up to the present days in the form of landsliding and slow block movements and their epiphenomena. Due to this continuing activity of the slope movements, human settlements and cultural monuments are endangered. Research in this area helps us to clarify the relation between slope movements and other factors, such as the presence of a significant tectonic failure in the vicinity or the influence of the water regime., Ingrid Forczek., and Obsahuje bibliografii
Studie je koncipována jako komplexní vyhodnocení mimořádně objemné destrukce gotických kamen, nalezené v roce 1997 při archeologickém výzkumu zámku v Pardubicích. Kamna zanikla patrně následkem požáru na přelomu 15. a 16. století. V destrukci převažují komorové a nádobkové kachle běžné tvarové škály. Početně výrazně jsou zastoupeny i jiné kamnové konstrukční prvky, ponejvíce desky několika tvarových a metrických formátů. Soubor keramických desek je z dvojího pohledu (dočasně) unikátní, což platí i v mezinárodním měřítku. Nemá obdobu ani co do celkového množství, ani co se týče druhové pestrosti. Zatím ale scházejí vodítka pro bližší funkční interpretaci desek. Hodnocení nálezu končí diskusí nad sociálním kontextem. Odpověď na klíčovou otázku, zda se do podoby předmětných kamen promítlo společenské postavení vrchnostenského rodu, však není možné jednoznačně zformulovat, vyznívá spíše záporně. and The study is conceived as a complex evaluation of a very large volume of debris from a Gothic stove found in 1997 during an archaeological excavation of the château in Pardubice. The stove was destroyed likely in a fire at the turn of the 16th century. The debris is composed mostly of panel and vessel tiles in the standard formal range. Stove construction elements are also represented in large numbers, especially panels of several formal and size formats. The assemblage of ceramic panels is unique from a pair of perspectives (temporarily), even on an international scale. It is also unparalleled with respect to the overall quantity and formal variety. However, evidence for a more detailed functional interpretation of the panels is missing for now. The evaluation of the find is concluded with a discussion on the social context. However, an answer to the key question as to whether the social standing of the noble family was projected into the appearance of the stove cannot be positively formulated, though it seems rather unlikely.
This paper describes limestone body situated in the northern part of the Branná group near Vápenná village in Javorník area. The body is confined by two major tectonic zones of this area - Sudetic Marginal Fault on the east and Ramzová overthrust on the south. Detailed tectonic analysis has been performed in two big limestone quarries named quarry I and II. Strikes and dips of fault planes and joints were measured. In the quarry I just one important orientation of the fault planes was found - WE mostly vertical. In the quarry II two main fault plane orientations were observed - vertical NW-SE Sudetic and NE-SW Moravo-Silesian. The senses of movements in the fault planes were determined using the calcite steps mainly as the kinematic indicators. Presence of the kinematic indicators allowed performing of paleostress analysis. Several different tectonic phases were identified and discussed., Lucie Nováková., and Obsahuje bibliografii