Samuel Ouya

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In this paper, we propose a predictive method to construct regular column-weight-three LDPC codes with girth g = 8 so that their Tanner graphs contain a minimum number of small trapping sets. Our construction is based on improvements of the Progressive Edge-Growth (PEG) algorithm. We first show how to detect the smallest trapping sets (5; 3) and (6; 4) in(More)
In this paper, we present an improvement of the PEG algorithm for constructing quasi-cyclic low-density parity-check (QC-LDPC) codes with large girth. We introduce the concept of PEG-undetectable cycles on the computation tree in the PEG algorithm for QC-LDPC codes and give a predictive method to avoid these undetected cycles. The aim is to select only the(More)
In this paper, we consider the influence maximization problem in social networks. The aim is to find a subset of k -- nodes called seeds, which maximizes the influence spread. We propose a new approach based on the Independent Cascade Model (ICM) which extracts an acyclic spanning graph from the social network. The extraction method used to build the(More)
In parallel to the using of resources implemented for distance learning, learners appreciate send and receive SMS. Although 4G offers very high data rates and adaptable quality of service, it does not support the SMS legacy service of GSM. 3GPP is currently specifying two architectures for SMS transmission: SMS over SGs, and SMS over IMS. However, when the(More)
In this paper, we consider the influence maximization problem in social networks. There are various works to maximize the influence spread. The aim is to find a k - nodes subset to maximize the influence spread in a network. We propose a new algorithm (BRST-algorithm) to determine a particular spanning tree. We also propose a new centrality measure. This(More)
In this paper, we propose a solution to reduce the dropout rate of students of distance learning platforms, while improving social contact between users. This solution consists of the design and development of a middleware application and a BigBlueButton Moodle plugin allowing access to social networks such as Facebook / Twitter to share information in a(More)
Risk management in banking sector is a key issue linked to financial system stability and its importance has been elevated by technological developments and emergence of new financial instruments. In this paper, we improve the model previously defined for quantifying internal control impact on banking risks by automatizing the residual criticality(More)
This paper proposes a collaborative system based on WebRTC technology to improve digital universities e-Learning environment. It allows teachers and students, through a web browser, to communicate via chat, audio and camera. It also supports file transfer and screen sharing for computer connected lab equipment. All these features are functional in an IP(More)
This paper deals with a numerical solution enabling universities to extend the functionality of their distance learning platform to improve not only their model of delivery of educational content but also their evaluation of learners' knowledge. Indeed, this paper proposes a solution for e-learning platform Moodle, to create virtual classrooms, integrating(More)