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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

內部人交易行為對股票報酬之影響--門檻模型之運用

蔡禮聰 Unknown Date (has links)
本研究採用門檻迴歸模型 (Threshold Autoregression Model),試圖找出董監事等內部人之申報轉讓比率、持股比率及質押比率等門檻值,進而分析門檻值以內及以外,指標對於代理變數:融資成長率、營收成長率以及本益比與加權指數報酬率的影響程度與方向。本研究實證結果發現: 一、在申報轉讓比率方面: 當申報轉讓比率低於門檻值,存在所謂的群聚效果。當申報轉讓比率高於門檻值時,市場動能與加權指數報酬率無顯著關係,投資人於此階段進行投資決策時應該要謹慎小心。 二、在持股比率方面: 在持股比率低於門檻值時,加權指數報酬率對於前期營收成長率表現的修正幅度較大,意謂著董監事等內部人根據其對未來營收資訊掌握的優勢,反應其對營收資訊的真實性,而藉由持股轉讓的行為,使加權指數大幅度的修正。 三、在質押比率方面: 不管高於或低於門檻值,均無法利用董監事等內部人質押比率為門檻變數來分析本益比效果對加權指數報酬率的影響。造成其檢定失效的原因,可能是樣本小且模型受到極端值的影響所造成。
22

Metody analýzy přenosových struktur v časové oblasti. / Techniques of time-domain analysis of interconnects.

Lábsky, Balázs January 2009 (has links)
This work deals with techniques of time-domain analysis of interconnects. After a studying crucial issue of time-domain analysis of interconnects methods of modeling and simulation simple interconnects in electrotechnics are described. For transient effect analysis two elementary methods can be used: the state variable method and the FDTD (Finite - Difference Time - Domain) method. The FDTD method can be used to solve partial differential equations in time domain, for instance equations of transmission lines. The method is very effective and delivers satisfactory results in case of linear and non-linear lines with a single “live” conductor. The method can be easily programmed in Matlab.
23

Digitálně řízený rezistor / Digital controlled resistor

Sedlář, Petr January 2009 (has links)
This master´s thesis deals with the design of the control circuits for digital potentiometers and their application in analog systems. Digital potentiometers are three-terminal resistors with an adjustable center connection. The digital potentiomneters enable to drive logic gates, LED drivers, LCD drivers, analog switches etc. Controlling of these mentioned devices is possible by the I2C 2- wire serial bus (invented by Philips). The digital potentiometers are used to control of the primary parameters like cut-off frequency and quality factor in the state variable filter and cut-off frequency in a passive filter. Both filters are simulated in PSpice and then compared with the measured results. Next parts of this master's thesis are a computer program and a exemplary protocol.
24

Analogové pole pro realizaci programovatelného filtru / Analog array for programable filter realization

Shadrin, Aleksandr January 2014 (has links)
The state-variable analog filter topologies are described. Using the transfer function theory and operational configurations suitable for integration and derivation, a new universal filter topology are proposed. The circuit has been implemented in CMOS technology by using six operational amplifiers, eight analog switches and five programming resistor array. Tunable corner frequencies, quality factors and gain are realized. Using the serial peripheral interface or digital memory can be realized this real-time digitally programmable first- and second-order analog filter with the tunable parameters.
25

Estimace rychlosti vozidla / Vehicle speed estimation

Roštek, Martin January 2018 (has links)
Rýchlosť vozidla je jednou z kľúčových stavových premenných, ktorej znalosť je potrebná v reálnom čase a s vysokou presnosťou, aby mohla slúžiť ako vstupná veličina pre systémy kontroly dynamiky vozidla. Jej priame meranie vo vozidle je však finančne náročné. Riešením tohoto problému môže byť použitie meraní zo senzorov bežne dostupných na palube vozidla a ich následný prepočet na rýchlosť vozidla. Tieto merania sú však veľmi zaťažené procesným šumom, čo vyplýva z komplexnosti pohybu vozidla. Preto je nutné vyvinúť algoritmus so schopnosťou vysporiadať sa s týmito negatívnymi vplyvmi. Algoritmus prezentovaný v tejto práci odhaduje pozdĺžnu rýchlosť vozidla s použitím meraní uhlových rýchlostí štyroch kolies, pozdĺžnej akcelerácie, momentov motora, rýchlosti otáčania okolo zvislej osi a natočenia volantu. Algoritmus bol testovaný na veľkom počte situácií považovaných za kritické na odhad rýchlosti vozidla, ako napríklad prudká akcelerácia na vozovke s nízkym koeficientom trenia, núdzové brzdenie s aktiváciou ABS, či jazda v kopci s kolesami v preklze, prinášajúc uspokojujúce výsledky.

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