Performances analysis of image encryption for medical applications

This work is interested in securing transmission of digital images on the Internet, in public or local networks such as medical images, military or biometrics (authentication retina or fingerprint). We will implement three famous algorithms which are the RSA, DES and AES. The first one uses an asymmetric method for generating the keys (public and private) hence the second and the third algorithms are symmetric cipher block and use only private key for ciphering and deciphering. The simulation results will be presented and discussed in function of two main security parameters which are the length of the information blocks and the key length. Finally, a comparative study between the three techniques is conducted in order to classify everyone by the best performances of robustness especially with the presence of different kinds of attacks

Innovative Grid-Connected Photovoltaic Systems Control Based on Complex-Vector-Filter

The research presented in this paper explains how the complex-vector-filter (CVF) method can help in minimizing the current harmonic of a grid-tied photovoltaic system. In fact, the harmonic-free positive sequence (HFPS) load current is used to produce referential sinusoidal currents. This control stabilizes the grid’s currents under unbalanced load currents, as well as mitigates undesirable harmonic load currents, while feeding clean active power to the grid. Thanks to the proposed controller, the performance, such as robustness, as well as the stability and dynamics of the CVF are more effective compared to the proportional-integral (PI) with phase-locked-loop (PLL) controller. Moreover, the CVF ensures robustness and stability during the synchronization between the photovoltaic (PV) generator and the utility grid system. The PI&PLL control presents higher active and reactive power fluctuations during synchronization. On the other hand, the CVF ensures the elimination of the reactive power fluctuations during synchronization. The performance of the proposed CVF is validated by simulation through MATLAB software. Under all conditions, the grid current, considering harmonics, is within the limits set by the IEEE-519 power quality standard, where a total harmonic distortion (THD) of 1.56% was achieved in the case of feeding a non-linear load

Evolution insolite d’une plaie complexe de la voie biliaire principale post cholécystectomie coelioscopique

Depuis l'avènement de la chirurgie coelioscopique de la lithiase biliaire le nombre de plaies des voies biliaires a sensiblement augmenté dans la littérature en rapport avec la courbe d'apprentissage des opérateurs. Les plaies méconnues peuvent avoir des conséquences immédiates dramatiques et évoluer vers la péritonite biliaire. Ailleurs la réparation des fistules biliaires externes au stade de dilatation des voies biliaires nécessite une anastomose bilio digestive ou des résections hépatiques réglées.Pan African Medical Journal 2016; 2

Cystadénome séreux du pancréas associe à une hétérotopie pancréatique

Les hétérotopies pancréatiques (HP) sont rares. Elles peuvent se voir à tout âge avec une légère prédominance masculine.ces lésions sont le plus souvent asymptomatiques, de découverte fortuite lors d'une endoscopie digestive haute ou basse ou lors de l'examen anatomopathologique d'un organe réséqué pour d'autres motifs, et peuvent être isolée ou associée à une pathologie digestive. Nous rapportons, à travers notre observation, l'association d'une HP à un cystadénome séreux du pancréas découverte lors de l'exploration des douleurs épigastriques isolées. A travers cette observation nous nous proposons d'étudier les particularités cliniques et histologiques de cette pathologie rare.Pan African Medical Journal 2016; 2

How to avoid partial implantation of people with cochlear malformation

Many advances have been made in recent years in the development of hearing and cochlear implants. These use acoustic and electrical stimulation technologies to improve speech intelligibility for the hearing impaired. However, for cochlear prostheses, the results are not very promising and vary from one patient to another. Certain technical and sometimes physiological problems have limited the expected performances of these devices, especially for children and the elderly. These problems include cochlear malformation and ossification of the auditory channels. This led us to reduce the number of electrodes in order to allow quality deep insertion while preserving the low-frequency acoustic bands of the operated patient

A Theoretical Study on the Simultaneous Hydrogen Production and Consumption in Proton Exchange Membrane Fuel Cell/Battery Electric Vehicles

Abstract: Hybrid electric vehicles are new technologies that will be used in future transportation networks in response to the need for sustainable development of environmentally friendly processes. Some of the energy sources used to develop these vehicles are batteries and proton exchange membrane (PEM) fuel cells (FCs), which cannot guarantee the energy required for life in the long term. Electricity storage systems (ESSs) such as the Ultra Batteries (UBs) are suitable candidates for solving the FC transient response issues. The combination of FCs and UBs in electric vehicles is called Fuel Cell Batteries Electric Vehicles (FCBEVs). In this work, an energy consumption model is adopted to simulate the performance of a FCBEV, by considering the power losses of various components, such as the FC, electric motor, the state of charge (SOC) of the battery, and breaks as well as by implementing a reinforcement-learning energy management strategy (EMS), pursuing this scope through the optimization of the hydrogen fuel consumption. In this regard, the motor prototype, after a transient period of around 2.5 min, was able to reach a number of runs equal to 2000, remaining stable for 10 min before coming down to zero. Keywords: Fuel cell, Fuel cell battery electric vehicle modeling, Energy management, Hydrogen

Large photovoltaic power plants integration: A review of challenges and solutions

Renewable energy systems (RESs), such as photovoltaic (PV) systems, are providing increasingly larger shares of power generation. PV systems are the fastest growing generation technology today with almost ~30% increase since 2015 reaching 509.3 GWp worldwide capacity by the end of 2018 and predicted to reach 1000 GWp by 2022. Due to the fluctuating and intermittent nature of PV systems, their large-scale integration into the grid poses momentous challenges. This paper provides a review of the technical challenges, such as frequency disturbances and voltage limit violation, related to the stability issues due to the large-scale and intensive PV system penetration into the power network. Possible solutions that mitigate the effect of large-scale PV system integration on the grid are also reviewed. Finally, power system stability when faults occur are outlined as well as their respective achievable solutions