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Abid M.R.,Alakhawayn University in Ifrane | Biaz S.,Auburn University
Computing | Year: 2015

Airtime is set as the default routing metric for the ongoing IEEE 802.11s wireless mesh networking standard. The metric is designed to minimize channel resource consumption by accounting for loss rate, bandwidth, and channel characteristics. However, the metric exhibits a noticeable ping–pong effect whose nature is still vague, and the very few references to this in the literature condemn it for being a perilous behavior. In this paper, we present a thorough study of the Airtime ping–pong effect, and highlight its correlation to the underlying rate control algorithms. Using different rate control algorithms (e.g., ARF, AARF, ONOE, AMRR and Constant rate), we establish that transmission rate adaptation is the principal cause behind the effect. We show that the effect is an inherent behavior, and that an accurate characterization of it can help improve network performance. We present a ping–pong-aware mechanism that, by detecting when a link undergoes such an effect, adapts the routing protocol for better network performance. The mechanism is O(1), decentralized, and can be easily integrated into the IEEE 802.11s routing protocol. © 2013, Springer-Verlag Wien. Source


Al Assaf M.M.,University of Jordan | Jiang X.,Auburn University | Abid M.R.,Alakhawayn University in Ifrane | Qin X.,Auburn University
Journal of Signal Processing Systems | Year: 2013

In this paper, we present an energy-aware informed prefetching technique called Eco-Storage that makes use of the application-disclosed access patterns to group the informed prefetching process in a hybrid storage system (e.g.; hard disk drive and solid state disks). Since the SSDs are more energy efficient than HDDs, aggressive prefetching for the data in the HDD level enables it to have as much standby time as possible in order to save power. In the Eco-Storage system, the application can still read its on-demand I/O reading requests from the hybrid storage system while the data blocks are prefetched in groups from HDD to SSD. We show that these two steps can be handled in parallel to decreases the system's power consumption. Our Eco-Storage technique differs from existing energy-aware prefetching schemes in two ways. First, Eco-Storage is implemented in a hybrid storage system where the SDD level is more energy efficient. Second, it can group the informed prefetching process and quickly prefetch the data from the HDD to the SSD to increase the frequent HDD standby times. This will makes the application finds most of its on-demand I/O reading requests in the SSD level. Finally, we develop a simulator to evaluate our Eco-Storage system performance. Our results show that our Eco-Storage reduces the power consumption by at least 75 % when compared with the worst case of non-Eco-Storage case using a real-world I/O trace. © 2013 Springer Science+Business Media New York. Source


Adhoni Z.A.,Qassim University | Hamad H.A.,Qassim University | Siddiqi A.A.,Taibah University | Mortaji L.E.,Alakhawayn University in Ifrane
Proceedings - 2013 Taibah University International Conference on Advances in Information Technology for the Holy Quran and Its Sciences, NOORIC 2013 | Year: 2013

This paper aims to provide a detailed account of the research and development efforts put in the design and development of a complete and comprehensive online cloud Qur'an portal. This portal will make all the reading and resource sections accessible to the audience whether they are using laptops, PCs, mobile, tablet, or personal digital assistants. In its completed form, the portal will cover almost all themes related to Qur'an, such as 'Al-Mus'haf', 'reciter', 'translation', 'search', 'study materials', and 'videos of scholars on Tajweed'. The application will provide a specific widget interface on a mobile phone, enabling quick access and implementing the specific multimedia features of a mobile phone. A Qur'an authentic translation for non-Arabic users is also available, and transliteration of Qur'an in Urdu for people who cannot read Urdu but understand it will also be included. It will also promote the research and study of Qur'an through an easy Qur'an search tools. © 2015 IEEE. Source


Abid M.R.,Alakhawayn University in Ifrane | Biaz S.,Auburn University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

Airtime is set as the default routing metric for the ongoing IEEE 802.11s wireless mesh networking standard. The metric is designed to minimize channel resource consumption by accounting for loss rate, bandwidth, and channel characteristics. However, the metric exhibits a noticeable ping-pong effect whose nature is still vague, and the very few references to this in the literature condemn it for being a perilous behavior. In this paper, we present a thorough study of the Airtime ping-pong effect, and highlight its correlation to the underlying rate control algorithms. Using different rate control algorithms (e.g., ARF, AARF, ONOE, AMRR and Constant rate), we establish that transmission rate adaptation is the principal cause behind the effect. We show that the effect is an inherent behavior, and that an accurate characterization of it can help improve network performance. We present a ping-pong-aware mechanism that, by detecting when a link undergoes such an effect, adapts the routing protocol for better network performance. The mechanism is O(1), decentralized, and can be easily integrated into the IEEE 802.11s routing protocol. © 2013 Springer-Verlag. Source


El Khaddar M.A.,Mohammed V University | Chraibi M.,Ecole Mohammedia des Ingenieurs | Harroud H.,Alakhawayn University in Ifrane | Boulmalf M.,International University of Rabat | And 2 more authors.
Proceedings of 2014 Science and Information Conference, SAI 2014 | Year: 2014

RFID and WSN technologies are widely used in today's pervasive computing. In Wireless Sensor Networks, sensor nodes sense the physical environment and send the sensed data to the sink by multi-hops. WSN are used in many applications such as military and environment monitoring. In Radio Frequency Identification, a unique ID is assigned to a RFID tag which is associated with a real world object. RFID applications cover many areas such as Supply Chain Management (SCM), healthcare, library management, automatic toll collection, etc. The integration of both technologies will bring many advantages in the future of ubiquitous computing, through the provision of real-world tracking and context information about the objects. This will increase considerably the automation of an information system. In order to process the large volume of data captured by sensors and RFID readers in real time, a middleware solution is needed. This middleware should be designed in a way to allow the aggregation, filtering and grouping of the data captured by the hardware devices before sending them to the backend applications. In this paper we demonstrate how our middleware solution called FlexRFID handles large amount of RFID and sensor scan data, and executes applications' business rules in real time through its policy-based Business Rules layer. The FlexRFID middleware provides easy addition and removal of hardware devices that capture data, as well as uses the business rules of the applications to control all its services. We demonstrate how the middleware controls some defined healthcare scenarios, and deals with the access control security concern to sensitive healthcare data through the use of policies. © 2014 The Science and Information (SAI) Organization. Source

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