West Jerusalem, Israel

Jerusalem College of Engineering

West Jerusalem, Israel

Azrieli College of Engineering Jerusalem is an Israeli academic college that trains engineers. It is located in the Ramat Beit HaKerem neighborhood of Jerusalem, between Jerusalem's two major high-tech industrial areas, Har Hotzvim and the Jerusalem Technology Park. Wikipedia.

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Pereg D.,Technion - Israel Institute of Technology | Ben-Zvi D.,Jerusalem College of Engineering
2016 IEEE International Conference on the Science of Electrical Engineering, ICSEE 2016 | Year: 2016

In this paper we present an algorithm for identifying a parametrically described destructive unknown system based on a non-gaussianity measure. It is known that under certain conditions the output of a linear system is more gaussian than the input. Hence, an inverse filter is searched, such that its output is minimally gaussian. We use the kurtosis as a measure of the non-gaussianity of the signal. A maximum of the kurtosis as a function of the deconvolving filter coefficients is searched. The search is done iteratively using the gradient ascent algorithm, and the coefficients at the maximum point correspond to the inverse filter coefficients. This filter may be applied to the distorted signal to obtain the original undistorted signal. While a similar approach has been used before, it was always directed at a particular kind of signals, commonly of impulsive characteristics. In this paper a successful attempt has been made to apply the algorithm to a wider range of signals, such as to process distorted audio signals and destructed images. The experimental results show very good performance in terms of recovering audio signals and blurred images, both for an FIR and IIR distorting filters. © 2016 IEEE.

Gur E.,Jerusalem College of Engineering
44th Annual Conference of the European Society for Engineering Education - Engineering Education on Top of the World: Industry-University Cooperation, SEFI 2016 | Year: 2016

In this paper the author examined EE undergraduate students with respect to the academic year they are in, the willingness to submit HW during the semester, and the success in the final exams. The results shown above indicate a correlation between submitting HW assignments and passing the finals, however, the correlation and the measure of success changes from one year to another. © 2016, European Society for Engineering Education (SEFI). All rights reserved.

Exman I.,Jerusalem College of Engineering
Communications in Computer and Information Science | Year: 2017

Many “theoretical” frameworks have been proposed for software systems design with a plethora of techniques, scopes and degrees of sophistication. However, a clear delineation of the forbidden in software design terms is almost universally absent in all these frameworks. This absence is surprising, as other engineering disciplines obviously display forbidden regions. This paper claims that an acceptable software design theory should clearly demarcate the forbidden in contrast to the possible. Algebra is argued to be the mathematical field appropriate to determine boundaries of forbidden regions. To this end, a spectral approach is demonstrated, in which matrix eigenvectors play a central role. Such boundaries of forbidden regions are illustrated by a case study. © Springer International Publishing AG 2017.

Vaithiyanathan R.,Jerusalem College of Engineering
Materials Today: Proceedings | Year: 2016

Photocatalytic decolourization of four different commercial textile azo dyes was studied under UV irradiation (365 nm) using titania catalysts, synthesized via sol gel method. In order to improve the photocatalytic activity of bare TiO2, silver metal impregnated titania catalysts containing varying amount of silver metal from 0.5-2.0% were synthesized and their photocatalytic activities towards the decolourization of selected dyes was studied. Result revealed that all the silver metal modified catalysts were found to have a superior photocatalytic activity than bare TiO2 and also it was observed that at higher loading of silver metal (beyond 1%), photocatalytic activity of titania was suppressed. Among the catalysts, 1% Ag impregnated titania was found to be the best one in the decolourization of all the dye solutions which may be due its lower band gap value (3.07 eV) and effective separation of electron-hole recombination by silver metal. All the synthesized photocatalysts were characterized by XRD and DRS techniques. © 2016 Elsevier Ltd. All rights reserved.

Ben-Av R.,Jerusalem College of Engineering | Exman I.,Jerusalem College of Engineering
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2011

A multiparty protocol for distributed quantum clock synchronization has been claimed to provide universal limits on the clock accuracy, viz., that accuracy monotonically decreases with the number n of party members. But this is only true for synchronization when one limits oneself to W states. This work shows that the usage of Z (Symmetric Dicke) states, a generalization of W states, results in improved accuracy, having a maximum when n/2 of its members have their qubits with a |1 eigenstate. © 2011 American Physical Society.

Exman I.,Jerusalem College of Engineering
Communications in Computer and Information Science | Year: 2013

Modularity is essential to obtain well-composed software systems from COTS (Commercial Off-The-Shelf) components. But COTS components do not necessarily match the modules of the designed software system. A clear-cut procedure is needed for the choice of the necessary and sufficient components providing the required functionalities. Linear Software Models are rigorous theoretical standards of modularity. These models are proposed as formal criteria for well-composed software systems. The paper lays down theoretical foundations - upon linear independence and reducible matrix concepts - providing precise meanings to familiar software concepts, such as coupling and the single responsibility theorem. The theory uses a Modularity Matrix - linking linearly independent software structors to composable software functionals. The theory has been tested by applying it to small canonical systems and to large software systems found in the literature. © Springer-Verlag Berlin Heidelberg 2013.

Rosenfeld A.,Jerusalem College of Engineering | Kraus S.,Bar - Ilan University
Autonomous Agents and Multi-Agent Systems | Year: 2012

Creating agents that realistically simulate and interact with people is an important problem. In this paper we present strong empirical evidence that such agents should be based on bounded rationality, and specifically on key elements from Aspiration Adaptation Theory (AAT). First, we analyzed the strategies people described they would use to solve two relatively basic optimization problems involving one and two parameters. Second, we studied the agents a different group of people wrote to solve these same problems. We then studied two realistic negotiation problems involving five and six parameters. Again, first we studied the negotiation strategies people used when interacting with other people. Then we studied two state of the art automated negotiation agents and negotiation sessions between these agents and people. We found that in both the optimizing and negotiation problems the overwhelming majority of automated agents and people used key elements from AAT, even when optimal solutions, machine learning techniques for solving multiple parameters, or bounded techniques other than AAT could have been implemented. We discuss the implications of our findings including suggestions for designing more effective agents for game and simulation environments. © 2010 The Author(s).

Driben R.,Jerusalem College of Engineering | Driben R.,Tel Aviv University | Malomed B.A.,Tel Aviv University
Optics Letters | Year: 2011

Families of analytical solutions are found for symmetric and antisymmetric solitons in a dual-core system with Kerr nonlinearity and parity-time (PT)-balanced gain and loss. The crucial issue is stability of the solitons. A stability region is obtained in an analytical form, and verified by simulations, for the PT-symmetric solitons. For the antisymmetric ones, the stability border is found in a numerical form. Moving solitons of both types collide elastically. The two soliton species merge into one in the " supersymmetric" case, with equal coefficients of gain, loss, and intercore coupling. These solitons feature a subexponential instability, which may be suppressed by periodic switching ("management"). © 2011 Optical Society of America.

Exman I.,Jerusalem College of Engineering
KEOD 2012 - Proceedings of the International Conference on Knowledge Engineering and Ontology Development | Year: 2012

Often objects with removed parts or functionality also lose their identity. But, there are situations in which this is not the case: identity is preserved. We refer to such objects, by means of Non-concepts, nonimplying partial negation and concept implying preserved identity. In this work Non- concepts are defined and pluggable ontologies are proposed for their representation. These ontologies are made pluggable by sockets, a novel kind of class. These are abstract place-holders for removed/added parts, functionalities or identities. The space of Non- concepts has been extensively explored. Pragmatic implications of Nonconcepts include manageable design of products with a multitude of models. Non- concepts are also relevant to the formal controversy whether composition is/isn't identity. The resolution is not sharp. Identity is entangled with composition, such that identity is preserved to a certain extent, until further removal causes identity break-down.

Exman I.,Jerusalem College of Engineering
ICSOFT 2012 - Proceedings of the 7th International Conference on Software Paradigm Trends | Year: 2012

Modularity is essential for automatic composition of real software systems from ready-made components. But given ready-made components do not necessarily correspond exactly to the units and functionality of designed software system architecture modules. One needs a neat composition procedure that guarantees the necessary and sufficient components to provide required units. Linear Software Models are rigorous theoretical standards subsuming modularity. The Linear-Reducible model is proposed as a model of wellcomposed software systems, above and beyond software variability. Indeed, case studies of representative systems recognized as well-composed, be they small, intermediate building blocks or large scale, are shown to be Linear-Reducible. The paper lays down theoretical foundations - upon exact linear independence and reducible matrix concepts - providing new precise meanings to familiar modularity ideas, such as the single responsibility theorem. The theory uses a Modularity Matrix - linking independent software structors to composable software functionals in a Linear Model.

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