Secure Digital Communication based on Hybrid Dynamical Systems

International audienceIn this work, a transmission scheme based on the hybrid and chaotic dynamics for private communications is proposed. The transmitter is composed of a continuoustime system and a discrete-time system in which the message is inserted by inclusion. The states of the continuous system are also included, after sampling, in the discrete system. The receiver is composed of a discrete-time delay observer and a continuous-time observer. The principle of the proposed hybrid method is to show that the reconstruction of discrete states of the receiver and the message passes at first by a synchronization of the two continuous-time chaotic systems. This new strategy makes the system of transmission robust, in particular against an attack known plaintext. Simulation results are presented to highlight the performances of the proposed method

Systèmes dynamiques hybrides pour les communications privées

International audienceDans ce travail, un schéma de transmission à base de dynamique hybride et chaotique pour les communications privées est proposé. L'émetteur est constitué d'un système en temps continu et d'un système en temps discret dans lequel le message est inséré à l'aide de la méthode dite par inclusion. Les états du système continu sont eux aussi après échantillonnage inclus dans le système discret. Le récepteur est constitué d'un observateur en temps discret retardé et d'un observateur en temps continu. Le principe de la méthode hybride proposée est de montrer que la reconstitution des états du récepteur discret ainsi que le message passe d'abord par la synchronisation des deux systèmes chaotiques en temps continu. Cette nouvelle stratégie robustifie le système de transmission, notamment à une attaque à texte clair connu. Les résultats de simulation sont présentés afin d'étudier les performances de la méthode proposée

Analysis of nucleosome repositioning by yeast ISWI and Chd1 chromatin remodeling complexes

ISWI proteins form the catalytic core of a subset of ATP-dependent chromatin remodelling activities in eukaryotes from yeast to man. Many of these complexes have been found to reposition nucleosomes, but with different directionalities. We find that the yeast Isw1a, Isw2 and Chd1 enzymes preferentially move nucleosomes towards more central locations on short DNA fragments whereas Isw1b does not. Importantly, the inherent positioning properties of the DNA play an important role in determining where nucleosomes are relocated to by all of these enzymes. However, a key difference is that the Isw1a, Isw2 and Chd1 enzymes are unable to move nucleosomes to positions closer than 15 bp from a DNA end whereas Isw1b can. We also find that there is a correlation between the inability of enzymes to move nucleosomes close to DNA ends and the preferential binding to nucleosomes bearing linker DNA. These observations suggest that the accessibility of linker DNA together with the positioning properties of the underlying DNA play important roles in determining the outcome of remodelling by these enzymes

The DNA-binding domain of the Chd1 chromatin-remodelling enzyme contains SANT and SLIDE domains

The ATP-dependent chromatin-remodelling enzyme Chd1 is a 168-kDa protein consisting of a double chromodomain, Snf2-related ATPase domain, and a C-terminal DNA-binding domain. Here, we show the DNA-binding domain is required for Saccharomyces cerevisiae Chd1 to bind and remodel nucleosomes. The crystal structure of this domain reveals the presence of structural homology to SANT and SLIDE domains previously identified in ISWI remodelling enzymes. The presence of these domains in ISWI and Chd1 chromatin-remodelling enzymes may provide a means of efficiently harnessing the action of the Snf2-related ATPase domain for the purpose of nucleosome spacing and provide an explanation for partial redundancy between these proteins. Site directed mutagenesis was used to identify residues important for DNA binding and generate a model describing the interaction of this domain with DNA. Through inclusion of Chd1 sequences in homology searches SLIDE domains were identified in CHD6–9 proteins. Point mutations to conserved amino acids within the human CHD7 SLIDE domain have been identified in patients with CHARGE syndrome

RELATIONSHIP BETWEEN CUSTOMER RELATIONSHIP MANAGEMENT (CRM) AND CONSUMER BUYING BEHAVIOUR(CBB) IN MOROCCAN BANKS: A QUALITATIVE STUDY

In view of the changes in the banking sector, the adoption of a customer relationship management (CRM) system is an important issue for banks. It contributes to the optimisation and management of customer portfolio, more precisely this system allows to acquire new customers and to increase the profitability of existing customers. This article aims to answer the following question: what is the relationship between CRM and the consumer buying behaviour (CBB) in Moroccan banks? The study we conducted among 21 bank branches. Also, the study provided insight into the direct and indirect relationships between the use of CRM systems and consumer buying behaviour. The respondents described each of the variables on the benefits of CRM systems as mediating factors and the variables on the attributes of consumer buying behaviour. JEL: M31, Z33 Article visualizations

The contribution of participation banks on the development of the mixed banking system: case of the Turkish Republic

Abstract. In this paper, we examine the impact of participation banks on the development of the hybrid banking system in the Turkish Republic, through an empirical study of independent variables that represent the development of participation banks such as allocated funds, raised funds and net profits, and the development of the mixed banking system that is represented by total assets and this is during the period of December 2011 to July 2018, it’s about 80 observations. First, we will start with the unit root test such as ADF, PP and KPSS tests to verify the stationarity of all variables, then we will apply the Johansen cointegration test for the long-term relationship to verify if there is a long-term co-integration relationship between the dependent variable and the independent ones. The results showed that all variables are stationary at the same level (2nd difference), so they are integrated in the same order (I1), while the Johansen test found that there are three long-term cointegration relationships between the variables involved. So, we concluded that participation banks contribute in the long term to the development of the mixed banking system of the Turkish Republic.Keywords. Participation banks, Mixed banking system, Turkey, Unit root test, Cointegration test.JEL. D39, E49, F69, F69, G21

DIGITALIZAÇÃO DO ENSINO SUPERIOR: IMPACTOS NAS PRÁTICAS DE GESTÃO E DESENVOLVIMENTO INSTITUCIONAL. UMA REVISÃO DE LITERATURA

For an extended period, the higher education community has been diligently endeavoring to implement technologically advanced and more efficacious methodologies. The aim is to enhance effectiveness and cultivate a generation of graduates equipped to navigate the evolving labor market dynamics and adapt to the influences of globalization. The outbreak of the Covid-19 pandemic significantly catalyzed the adoption of digital education, often referred to as "E-Learning," as a predominant mode of instruction across a majority of countries. This shift was necessitated by the imperative to adhere to social distancing measures and prevent the potential collapse of the educational infrastructure. In the wake of this transformative paradigm, educational institutions were compelled to engineer inventive management approaches to effectively traverse this altered landscape, marking the dawn of a new era. This era is characterized by a profound dependence on advanced technology and unfettered information accessibility as pivotal factors for sustaining and optimizing performance.This paper aims to explain the basic ideas behind managing higher education while exploring the existing research that supports these ideas. By breaking down the various aspects and tools involved, the goal is to shed light on the complex nature of managing higher education. This exploration eventually leads to an examination of how the digitalization of education impacts different functional areas of education management. Through this in-depth analysis, a clear connection emerges between the need for digitalization and the necessity to update management systems. This connection is crucial for not only achieving but also sustaining effective operation in this new era that combines technology and education.Durante um longo período, a comunidade do ensino superior tem-se esforçado diligentemente por implementar metodologias tecnologicamente avançadas e mais eficazes. O objetivo é aumentar a eficácia e cultivar uma geração de licenciados equipados para navegar na dinâmica do mercado de trabalho em evolução e adaptar-se às influências da globalização. O surto da pandemia de Covid-19 catalisou significativamente a adoção da educação digital, muitas vezes referida como "E-Learning", como um modo predominante de ensino na maioria dos países. Esta mudança foi necessária devido ao imperativo de aderir a medidas de distanciamento social e evitar o potencial colapso da infraestrutura educativa. Na sequência deste paradigma transformador, as instituições de ensino foram obrigadas a conceber abordagens de gestão inventivas para atravessar eficazmente esta paisagem alterada, marcando o início de uma nova era. Esta era caracteriza-se por uma profunda dependência da tecnologia avançada e da acessibilidade ilimitada à informação como factores essenciais para sustentar e otimizar o desempenho. Este documento tem por objetivo explicar as ideias básicas subjacentes à gestão do ensino superior, explorando simultaneamente a investigação existente que apoia estas ideias. Ao decompor os vários aspectos e instrumentos envolvidos, o objetivo é esclarecer a natureza complexa da gestão do ensino superior. Esta exploração acaba por conduzir a um exame da forma como a digitalização do ensino afecta as diferentes áreas funcionais da gestão do ensino. Através desta análise aprofundada, surge uma ligação clara entre a necessidade de digitalização e a necessidade de atualizar os sistemas de gestão. Esta ligação é crucial não só para alcançar, mas também para manter um funcionamento eficaz nesta nova era que combina tecnologia e educação

STRATEGIC ANALYSIS OF THE CURRENT SITUATION OF MOROCCAN PARTICIPATORY BANKING SECTOR

The Moroccan participatory banking sector is relatively new, the development and the future of this industry are still uncertain, in this study we tried to analyze from a strategic point of view the current situation of this banking sector in Morocco, several marketing tools have been used, the PEST analysis, the 5 forces of porter as well as the SWOT analysis. The results of our analysis show that the development of the participatory banking sector in Morocco is promising. JEL: M31, Z33, G21  Article visualizations

THE IMPACT OF THE AUTOMOTIVE INDUSTRY ON THE MOROCCAN ECONOMY

This study explains the relationship between the Moroccan automotive industry, employment and gross domestic product GDP, for this reason, a literature review on the subject was conducted, which allowed us to understand the relationship between all variables. After the analysis, the results show that the variables integration order allowed us to apply the error correction model (ECM), in fact, this model confirmed the relationships between the variables, and showed that the automotive industry in Morocco has a significant positive impact on employment and GDP. JEL: L60; L62 Article visualizations