Papers by Kassiani Kotsidou
SoutheastCon 2018, 2018
Singularity functions are an important topic in undergraduate studies covered primarily in signal... more Singularity functions are an important topic in undergraduate studies covered primarily in signal processing. Some of those functions are the step function, the ramp function and the parabolic function. Using the step function, several different periodic square waves can be formed. Using the ramp function several periodic triangular waves can be formed. To achieve this, MATLAB functions called stp_fn, rmp_fn, par_fn, and cub_fn were written. This allows the study of Fourier Series of such signals which is a method of expressing a periodic signal as a sum of sinusoids. To obtain such series the complex exponential form was used. MATLAB programs were written to see how many sinusoidal terms (harmonics) are needed to approximate a square wave and a triangular wave. The Gibbs phenomenon is observed as well. The Fourier Series allows someone to observe the components of a signal which would otherwise be very difficult to observe. Moreover, Fourier Series makes filtering or manipulating the components of a signal possible. A convolution of two signals is included in this work as well.
The engineering and management of communication networks rely on the monitoring, sampling, aggreg... more The engineering and management of communication networks rely on the monitoring, sampling, aggregation and modeling of network traffic measurements and identification of invariant traffic features. Internet traffic measurement and analysis work in recent years has focussed on modeling aggregate traffic measured at end-systems, access and back-bone nodes. The results of these studies have shown that the traffic exhibits complex features that are not readily amenable for application in classical traffic engineering models. The basic problem is centered around the observation that the traffic lacks a characteristic time scale. The pervasiveness of long tails in empirically estimated distributions of arrival rates, packet counts and interarrival times has led to a number of investigations into the causality of this feature. Recent studies have shown that Internet traffic exhibits nonstationarity [1, 2, 3, 4] over a large range of time scales. This feature has been problematic for identi...
WSEAS Transactions on Information Science and Applications archive, 2018
This paper explains the pedagogical advantages of student projects and describes the project a fr... more This paper explains the pedagogical advantages of student projects and describes the project a freshman at Northern Kentucky University carried out. This project uses NI myRIO paired with third party sensors to prototype a lock opener
CIMSA. 2005 IEEE International Conference on Computational Intelligence for Measurement Systems and Applications, 2005.
... Study of Non-Uniform Link Weights on Interconnected Complex Systems with Application to Multi... more ... Study of Non-Uniform Link Weights on Interconnected Complex Systems with Application to Multi-Agent Systems Kassiani Kotsidou and Dalila Megherbi Center for Man/Machine Intelligence, Networking and Distributed Systems (CMINDS), ECE Dept. ...
Lecture Notes in Control and Information Sciences, 2009
Chapter 33 Acoustic Coupling on the Robot Motion and Control Kassiani Kotsidou 33.1 Introduction ... more Chapter 33 Acoustic Coupling on the Robot Motion and Control Kassiani Kotsidou 33.1 Introduction ... If the bit is one, the corresponding segment produces sound pressure amplitude whichKassiani Kotsidou Lafayette College, Pennsylvania, USA e-mail: [email protected] ...
The Journal of the Acoustical Society of America, 2007
Digital reconstruction of sound using array of microspeakers. [The Journal of the Acoustical Soci... more Digital reconstruction of sound using array of microspeakers. [The Journal of the Acoustical Society of America 122, 3053 (2007)]. Kassiani Kotsidou, Charles Thompson. Abstract. This work examines the digital reconstruction ...
The Journal of the Acoustical Society of America, 2009
This paper demonstrates the merit of "matched asymptotic expansions" by applying the method to th... more This paper demonstrates the merit of "matched asymptotic expansions" by applying the method to the analysis of the acoustical coupling between vibrating pistons. The accuracy of the method is verified by comparing the results of this study with existing solutions. The method uses the disparity between the characteristic length scale of the nearly incompressible fluid motion near the piston and that of the far field acoustic pressure. The velocity potential in each region is developed in terms of a singular perturbation expansion. Finally, the combination of the locally valid solutions leads to a global solution.
The Journal of the Acoustical Society of America, 2006
In this work, we will analyze fluid‐borne coupling between adjacent elements of a transducer arra... more In this work, we will analyze fluid‐borne coupling between adjacent elements of a transducer array. In the case of a transducer having low inertia mass, such coupling can result in a reduction in the radiation efficiency and the directional fidelity of the array. The coupling factor and the mutual radiation impedance have been investigated by Lord Rayleigh (1903), Wolff and Malter (1929), and R. I. Pritchard (1960) for the case of an array comprised of ideal piston radiators. These results will be used as a starting point for our work. The effect of the inertia impedance of the transducer and the control of the special distribution of the radiated field is considered.
The Journal of the Acoustical Society of America, 2007
In this work we will examine the coupling between direct sound radiators. It will be shown that a... more In this work we will examine the coupling between direct sound radiators. It will be shown that at low frequencies, the mutual impedance between a pair of transducers is analogous to that of two simple sources. Hence the magnitude of their interaction will be inversely proportional to their separation distance. The phase is proportional to the propagation time between a transducer pair. The implication of this result is explored in the design of a densely packed arrays, will be examined.
Title: Acoustical modeling of micro-transducer arrays. Authors: Kotsidou, Kassiani. Affiliation: ... more Title: Acoustical modeling of micro-transducer arrays. Authors: Kotsidou, Kassiani. Affiliation: AA(University of Massachusetts Lowell). Publication: ProQuest Dissertations And Theses; Thesis (Ph.D.)--University of Massachusetts ...
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Papers by Kassiani Kotsidou