In this paper, a simple frame size adjustment of dynamic framed slotted Aloha for tag identification in RFID networks is proposed. In dynamic framed slotted Aloha, the reader is required to announce the frame size for every frame. To achieve maximum system efficiency, it is essential to set the frame size according to the number unidentified tags appropriately. The proposed approach utilizes th...

Slotted waveguide antennas (SWA) are often employed in radar applications where design specifications commonly require high gains and mechanical robustness. Since the peak power transmitted by radar antennas is usually very high, waveguide antennas present a practical alternative to planar arrays. While numerous design references and guidelines exist for planar arrays, there are far fewer for s...

Silvano Pupolin , Luciano Tomba , Michele Zorzi Dipartimento di Elettronica e Informatica, University of Padova Via G. Gradenigo 6/A, I-35131 Padova (Italy) Dipartimento di Elettronica e Informazione, Politecnico of Milano Piazza Leonardo da Vinci 32, I-20133 Milano (Italy) Abstract—The actual trend towards Personal Communication Systems suggests to devote considerable research efforts to find ...

In this paper, bin-slotted hybrid search algorithm (BHS) combined slotted ALOHA procedure with bin-tree procedure is proposed and analyzed. Also, the performance of proposed anti-collision algorithm is evaluated as comparing the BHS algorithm with a standard bin-slotted algorithm (BSA) through the simulation. The performance of the proposed BHS algorithm is improved by dynamically identifying t...

Three basic helix-loop-helix proteins regulate sequential steps in the formation of stomata: SPEECHLESS initiates entry into the stomatal lineage; MUTE controls asymmetric divisions of stomatal precursor cells; and FAMA promotes guard cell differentiation.

Generating one-month-ahead systematic (beta) risk forecasts is common place in financial management. This paper evaluates the accuracy of these beta forecasts in three return measurement settings; monthly, daily and 30 minutes. It is found that the popular Fama-MacBeth beta from 5 years of monthly returns generates the most accurate beta forecast among estimators based on monthly returns. A rea...

This paper empirically analyzes the effect of the inclusion of German corporations in the Dow Jones STOXX Sustainability Index (DJSI STOXX) and the Dow Jones Sustainability World Index (DJSI World) on stock performance. In order to receive robust estimation results, we apply an (short-term) event study approach that is based on both a modern asset pricing model, namely the three-factor model ac...

The Fama-Macbeth (1973) rolling-β method is widely used for estimating risk premiums, but its inherent errors-in-variables bias remains an unresolved problem, particularly when using individual assets or macroeconomic factors. We propose a solution with a particular instrumental variable, β calculated from alternate observations. The resulting estimators are unbiased. In simulations, we compare...

In this study, the validity of five-factor model in developing and underdeveloped countries was investigated 2012-2020, as well to be created by using inflation rate instead risk-free interest rate, answers questions its comparison with original model. seeking an answer question, Pakistan, Malaysia, Indonesia Turkey were selected interest-sensitive investors. Kuala Lumpur Composite Index (KLCI)...