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Publications (31)
The development of context-aware applications is a complex process that involves context management. A context life cycle implies 4 essential steps: context acquisition, context modeling, context reasoning and context dissemination [1]. In [2], we tackled the issue of context modeling and reasoning by proposing an approach based on Relational Conce...
As the notion of context-awareness evolves in different paradigms, the development of context-aware systems involves several processes. These processes include, inter alia, context modeling and reasoning as well as adaptation. In [1], we presented an approach that consists of context modeling and reasoning hand in hand based on relational concept a...
Due to advances in wireless network technology, new applications are designed in medical and health care domain. Medical personnel efficiency has increased by using these new tools and applications. Patient of young and elderly people as well as smart houses equipped with sensors and information technologies are subject to discussion. Patients wear...
Clustering in wireless sensor networks is an important technique to improve routing, reduce the communication overhead in several cases and reduce the energy consumption. In this paper, we propose a new clustering algorithm for mobile wireless sensor networks. The objective of our proposed algorithm is improving the network stability and saving the...
This work was carried out in the context of information modeling of social networks information and its use in the area of medical applications. The ontology of a social network (namely Facebook) is determined. This modeling together with specific ontology in the health domain, allowed us to build an ontology-based system for context dependant appl...
This work was done in the context of information exchange between websites for online bookings of air tickets, hotel rooms and car rentals, such as travelocity.com, expedia.com, etc. These sites obtain their data from hotel data providers or specific centers (known as Central Reservation Systems (CRS)), airline companies and car rental agencies. Th...
This paper proposes strategies for query execution in mobile databases distributed over a mobile network. The underlying network architecture of the database is based on 3G telephone networks.
This paper describes architecture for mobile databases where data is distributed over mobile devices. We propose strategies for query execution during mobility. The underlying architecture is based on 3G telephone networks.
The Web services family of standards promotes the interoperability of heterogeneous distributed systems by separating the definition of a service from, 1) its implementation language, 2) its internal data representation, and 3) the communication protocol used to access it. The UDDI standard addresses aspects related to the publication and querying...
In this paper, we describe a strategy for service discovery and publication coupled with routing protocols. We propose a new protocol for services discovery called SEDIRAN (Service Discovery and Interaction with Routing protocols in Ad hoc Networks), on top of a reactive routing protocol, namely, AODV (Ad hoc On demand Distance Vector). However, we...
A low current front-end transimpedance amplifier (TIA) circuit for a high-speed light emitting diode (LED) and photodetector (PD) pair is presented. It mitigates PD capacitance effects by using a low input impedance buffer between the PD and the amplifier's input stage. Our simulation results show that a bandwidth in excess of 100 MHz can be reache...
Traffic grooming received a lot of attentions in last few years and can be considered under two views, locally for each separate grooming entity and globally in a group of grooming entities. However, optimization of traffic grooming at each separate grooming entity sometime doesn't bring about an optimal solution for global traffic grooming, if not...
Wireless data services are expected to see in the forth generation (4G) network the same growth in demand that Internet services and wireless voice services have seen in recent years. This paper presents twofold purposes. The former, an architecture for heterogeneous networks that relies on mobile stream control transmission protocol to reach mobil...
Considering the possibilities and strengths of the current telecommunication systems and the associate emergent technologies, it has become imperative to address concerns to open opportunities aiming at popularizing the access to education systems. This work proposes an API architecture to services for the discovery of educational contents using th...
General Packet Radio Service (GPRS) is a new service which provides packet radio access for users based on the Global System in Mobile Communications (GSM) technology. It is an important step towards packet switching paradigms in mobile communications. The integration of GPRS into GSM has created conditions to extend mobile communications over publ...
Recent advances in telecommunication allow for a large variety of new communication means. Users are now able to access Internet contents through various devices such as laptops, PCs, PDAs, cellular phones, Web TV, etc. These devices can connect through new networks and protocols (e.g. GSM, GPRS. WAP, WiFi, etc). These networks and access protocols...
Traffic grooming in optical networks is attracting so much the attention of many telecom researchers now. Traffic grooming can be considered separately at each individual node basing on only local information (local grooming), or in cooperation between nodes participating in grooming (global grooming). In the second case, nodes must exchange their...
Fourth generation (4G) mobile devices and services will transform wireless communications into a realtime connectivity. Our paper aims to present twofold solutions, a proposal architecture for the Internet content adaptation for the mobile and heterogeneous environments. We aim to provide adapted Internet contents to the users of various devices by...
The web services family of standards is meant to deliver on the promise of inter-operability of heterogeneous distributed systems by separating the definition of a service from, 1) its implementation language, 2) its internal data representation, and 3) the communication protocol used to access it. The UDDI standard addresses aspects related to the...
The web services family of standards is meant to deliver on the promise of inter-operability of heterogeneous distributed systems by separating the definition of a service from, 1) its implementation language, 2) its internal data representation, and 3) the communication protocol used to access it. The UDDI standard addresses aspects related to the...
The integration and the implementation of Internet transport protocols over wireless networks has increasingly proven to be unavoidable. However, the environments over which wireless protocols act are very different from those found on wired networks. Several contributions were proposed to adapt the current protocols such as TCP to the wireless env...
A Hoare-style proof system for LOTOS, defined in terms of proof rules based on the structure of processes, is presented. Hoare's satisfaction relation is used to define these rules. This system is based on the failures model. It is shown to be adequate to allow proofs of correctness of compound processes to be constructed from proofs of correctness...
Trace theory concepts are added to LOTOS and appropriate composition functions on traces are defined. The result is a trace theory that is suitable for reasoning about communication sequences of LOTOS behavior expressions. This is illustrated by defining a trace set semantics and a trace-based proof system for LOTOS. An example, consisting of the p...
INDO-molecular orbital calculations have been performed on a number of amino acids, namely, alanine, phenylalanine, some tyrosines and histidine. Computations on N-acetylhistidine are included for comparison. The results obtained for the charge densities and dipole moments were used to get a “structurefunction” correlation.
The effects of gamma radiations on the kinetic parameters of the three stages of isothermal decomposition of calcium oxalate monohydrate were investigated. Radiation did not modify the mechanism of thermal decomposition reactions and kinetic analysis of data showed that the random nucleation and the two-dimensional phase boundary reaction models gi...
Solids of 3-iodo-, 3-5 di-iodotyrosine and 3,5-di-iodothyronine were irradiated by 60Co-gamma irradiation for a period of about twenty hours. The effects of irradiation were investigated through a study of the UV and IR spectra of irradiated samples. UV spectra showed the presence of a new band at 360 nm which was assigned to the formation of IO−....
Organizations build software systems to support their business processes. There are different levels of support, ranging from simply recording the activities of an essentially manual process, to performing the clerical tasks of the process, leaving decisions to humans, to fully automating the business process, with rule based decision making. We pr...
Web services are emerging as a key infrastructure for providing inter-operation between applications and systems and for providing support for the deployment of e-commerce business processes. One important issue for ensuring the growth of Web services is having ways of describing the available Web services in a precise way. Various languages and no...
