د. نصر بشير سالم عكريم

  • المؤهل العلمي: دكتوراة
  • الدرجة العلمية: استاذ مساعد
  • كلية الهندسة - جامعة الزيتونة

ملخص

تحصل الدكتور نصر بشير عكريم على درجة الدكتوراه من جامعة مدينة دبلن ، دبلن ، أيرلندا عام 2009 في مجال الهندسة الكهربائية والإلكترونية. إنضم د. نصر عكريم إلى أعضاء هيئة التدريس بجامعة الزيتونة في كلية الهندسة ، قسم الهندسة الكهربائية والإلكترونية كمحاضر في عام 2013. في يناير 2016 ، أصبح أستاذًا مساعدًا. تم نقل الدكتور نصر إلى قسم هندسة الكمبيوتر والإلكترونيات في أكتوبر 2018 بناء على طلب هذا القسم حيث أصبح رئيساً للقسم. الدكتور نصر عكريم له العديد من المنشورات العلمية في مجال تخصصه حيث أنه مؤلف أو مؤلف مشارك لأكثر من 8 ورقات في المجلات الدولية المحكة وأكثر من 8 مساهمات في عدة مؤثمرات علمية.

المؤهلات

3 ,2009

دكتوراة


المنشورات

Security Analysis and Improvement for Wireless Security protocols

Abstract: Wireless technology has been gaining rapidpopularity for some years. Adaptation of a standard dependson the ease of use and level of security it provides. In this case,contrast between wireless usage and security standards showthat the security is not keeping up with the growth paste of enduser’s usage. Current wireless technologies in use allowhackers to monitor and even change the integrity oftransmitted data. Lack of rigid security standards has causedcompanies to invest millions on securing their wirelessnetworks ,There are three major types of security standards inwireless, Weexplained the structure of WEP and WPA as first and secondwireless security protocols and discussed all their versions, problems and improvements. Now, we try to explain WPA2versions, problems and enhancements that have done solve theWPA major weakness. Finally we make a comparison amongWEP and WPA and WPA2 as all wireless security protocols inWi-Fi technology. In the next phase we hope that we willpublish a complete comparison among wireless securitytechniques by add the WiMax security technique and make awhole comparison among all security protocols in this area. Keywords: Wireless Security, WEP, WPA, WPA2, 802.11i
Nagmden Miled Naser, Nasser Bashir Ekreem, Adel Ashour Abosdel, (12-2019)
Publisher's website


Robust Fault Detection Using QQ-Plot

Abstract Because of the presence of sporadic high-intensity measurement noise (outliers), an adaptive algorithm for the robust estimation of parameters of linear dynamic discrete-time systems is proposed in this paper. First, the sorted data versus the normal quantiles is plotted, called QQ-plot. Next, the ε-contaminated normal distribution of noise is adopted. Then, a data classification procedure based on the QQ-plot approach, combined with the robustified data winsorization technique, is developed; the estimation of the unknown noise statistical parameters is solved. Moreover, an iterative procedure for estimating the contamination degree ε, which originated from an ML classification, is also proposed. Thus, a ε-contaminated noise distribution is estimated and, the suboptimal maximum likelihood criterion is defined, and the system-parameter estimation problem is solved robustly, using the proposed recursive robust parameter estimation scheme. Finally, these parameters are used to estimate water level in the steam drum and residual of the steam-drum water level sensor.
Nasar Aldian Ambark Shashoa, Sulaiman Khalifa Yakhlef, Mansour Ali W. Marei, Nasser Bashir Ekreem, (2-2004)


Measurement and FEMM Modelling of Experimentally Generated Strong Magnetic Fields

Abstract This work presents correlations between experimentally generated magnetic field strengths and computationally modeled field strengths. The experimental set-up comprised a C-shape structure designed to generate strong magnetic field strengths. The sections of the C-structure were individual solenoids made from copper-wound low carbon steel. These sections were connected such that the overall structure formed a continuous conduit for the magnetic flux and concentrated the magnetic field into an air gap. This experimental set-up could be used for magnetic annealing, or alternatively to measure the magnetostrictive strain properties of suitable materials, placed in the air gap. Magnetic field strengths of approximately 1.0 Tesla (T) were measured using a magnetic field strength meter. Finite Element Method Magnetics (FEMM) computational modeling software was used to model the design and predict field strengths. Modeled field strengths fell short of practical measurements. The efficiency of the apparatus in producing high fields is reduced due to effects related to drilling and machining of the steel core. Other reasons for discrepancies include the configuration of the C-shape, the properties of the core material, and skin effects. By building these considerations into the FEMM model, a more accurate representation of the workings of the C-shape set-up was achieved.
Nasser Bashir Ekreem, Mohamed A. S. Hassan, Nasar Aldian Ambark Shashoa, Abdurrezag S. Elmezughi, (1-2016)