This note presents a frequency domain method to solve the standard control problem for processes with a single delay. For a given bound on the closed-loop norm, there exist proper stabilizing controllers that achieve this bound if and only if both the corresponding delay-free problem and an extended Nehari problem with a delay (or a one-block problem) are all solvable. The solvability of the ex...

In this paper, we present a geometric method for describing the effects of the delay induced uncertainty on the stability of a standard Smith Predictor control scheme. The method consists of deriving the stability crossing curves in the parameter space defined by the nominal delay, and delay uncertainty, respectively. More precisely, we start by computing the crossing set, which consists of all...

This paper presents a non-linear control scheme to deal with dead-time (DT) processes where small rise times are required. The control scheme is based on the combination of two strategies appeared in the literature to deal with DT processes, the Filtered Smith Predictor (FSP), which is a Smith Predictor (SP) including a filter to improve the robustness, and the PI+CI, a PI with a partial reset ...

In this paper, a comparative study of Picard method, Adomian method and Predictor-Corrector method are presented for fractional integral equation. In Picard method [6] a uniform convergent solution for the fractional integral equation is obtained. Also, for Adomian method, we construct a series solution see ([1], [5] and [7]). Finally, Predictor-Corrector method is used for solving fractional i...

Ransomware, a type of malicious software that encrypts a victim’s files and only releases the cryptographic key once a ransom is paid, has emerged as a potentially devastating class of cybercrimes in the past few years. In this paper, we present RAPTOR, a promising line of defense against ransomware attacks. RAPTOR fingerprints attackers’ operations to forecast ransomware activity. More specifi...

The perceptron branch predictor has been recently proposed by Jiménez and Lin as an alternative to conventional branch predictors. In this paper, we build upon this original proposal in three directions. First, we show that the potential accuracy that can be achieved by perceptron-like predictors was largely underestimated. The accuracy of the redundant history skewed perceptron predictor (RHSP...

We describe a new branch predictor that is designed to balance multiple constraints—predicting branch biases versus predicting specific branch instance behavior. Most branch instances only require branch bias information for accurate predictions while a select few require more sophisticated prediction structures. Our predictor uses a cache mechanism to classify branches and dynamically adjust t...

From the moment of conception, we begin to age. A decay of cellular structures, gene regulation, and DNA sequence ages cells and organisms. DNA methylation patterns change with increasing age and contribute to age related disease. Here we identify 88 sites in or near 80 genes for which the degree of cytosine methylation is significantly correlated with age in saliva of 34 male identical twin pa...