مجال
التميز
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تميز دراسي وبحثي (ماجستير ودكتواره)
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البحوث المنشورة
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البحث (1):
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عنوان البحث:
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SIP-based internetwork system between Future
IP Networks and ZigBee based )Wireless Personal Area Networks (WPAN
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رابط البحث:
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Click here
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تاريخ النشر:
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12-13/09/2012
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موجز عن البحث:
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The dynamic nature of ZigBee Wireless
Networks affect the Quality of Service (QoS) for reliable connectivity
systems over the Next Generation Network systems. For SIP based sensing and
actuating applications, there is two internetwork approaches between ZigBee
Wireless Networks and IP based Next Generation Networks; the SIP Proxy Based
approach, and the ZigBee Stack Based approach. In this paper, we proposed the
Mod-SIP, which is a modified version of SIP for ZigBee Stack Based approach,
and the Combined Approach, which is an enhanced internetwork system to
provide more reliable and flexible connectivity system between ZigBee
Wireless Networks and Next Generation IP based Network systems. The initial
simulation efforts on OPNET examined the available approaches and compared it
with the proposed approaches. The SIP Proxy Based approach shown low
efficiency for SIP based applications with high End-to-End delays because of
the poor connectivity system for SIP signalling over ZigBee WPANs.
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البحث (2):
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عنوان البحث:
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RESTful-Based
Bi-level Distribution Framework for Context-Based Mobile Web Service
Provision
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رابط إلى البحث:
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Click
here
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تاريخ النشر:
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03/03/2015
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موجز عن البحث:
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Abstract—Complex mobile Web
services can be provided from the mobile host in a light weight manner by
either partial distributing the execution tasks of the server to a stationary
device or completely migrate the execution tasks of the service logic to another
mobile host. Our approach goes beyond that and allows running more complex
services through applying a bi-level distribution of the execution tasks and
the service logic to other mobiles. The technology used is based on REST
architectural style. An Extended Mobile Host Complex Web service Framework
(EMHCF) for providing complex context-based Web services is defined and
developed. The set of mechanisms, which are deployed in the EMHCF, depends on
the REST characteristics to facilitate service distribution. Verifying the
safety properties of the system is carried out analytically based on formal
methods. This is complemented with an empirical validation of the correct
behavior of the system through proof-of-concept prototype implementation. The
running experimental tests examine the best suitable case scenario for
partial distribution.
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المؤتمرات العلمية:
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المؤتمر (1):
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عنوان المؤتمر:
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Computer
Science and Electronic Engineering Conference (CEEC), 2012 4th
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تاريخ الإنعقاد:
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12-13/09/2012
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بلد
ومكان الإنعقاد:
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Colchester,
UK
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طبيعة المشاركة:
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Research
Paper Presentation
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عنوان المشاركة:
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SIP-Based
Internetwork System Between Future IP Networks and ZigBee Based Wireless
Personal Area Networks (WPAN)
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ملخص المشاركة:
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The
internetwork system between Future IP Networks and ZigBee Wireless Networks
has two main approaches; the SIP Proxy Based approach, and the ZigBee Stack
Based approach. Because of the dynamic nature of the ZigBee devices, both
approaches need to be improved to support the connectivity system and the
Quality of Service (QoS) for different types of sensing and actuating
applications. This paper proposes an initial design for a modified version of
SIP (Mod-SIP) for ZigBee Stack Based approach. In addition, the paper
introduces the Combined Approach which is an enhanced internetwork system
used to provide more reliable and flexible connectivity system between ZigBee
WPANs, and the IP clouds. An initial design and simulation efforts on OPNET
implemented to study the current approaches and compare it with the proposed
approaches. It shows that the SIP Proxy Based approach is not efficient for
Future IP Networks applications as it has a high rate of End-to-End delays
because of the lack of flexibility between SIP signaling system and the
ZigBee WPANs. The initial investigations shown that the Combined approach can
provide more reliable connectivity system with the support for the QoS for
different types of instantaneous applications such as VoIP and video
conferencing.
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المؤتمر (2):
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عنوان المؤتمر:
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15th International
Conference on Computer Modelling and Simulation (2013 UKSim)
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تاريخ الإنعقاد:
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10-12/04/2013
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بلد
ومكان الإنعقاد:
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Cambridge,
UK
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طبيعة المشاركة:
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Research
Paper Presentation
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عنوان المشاركة:
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Evaluation
of SIP Signalling and QoS for VoIP Over OLSR MANET Routing Protocol
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ملخص المشاركة:
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This
paper evaluates the SIP based VoIP applications over the Optimized Link State
Routing protocol (OLSR) as a proactive routing protocol for Mobile Ad Hoc
Networks (MANET) using Static, Uniform, and Random mobility models. The
evaluation considered PCM, LQS, IP-Telephony, and GSM voice codecs to study
the SIP signaling performance and the voice Quality of Service (QoS) for VoIP
calls over OLSR MANET. The simulation efforts performed in OPNET Modeler
17.1. The results show that VoIP over OLSR MANET has good performance over
Static and Uniform mobility models while it has variable performance with
Random models. SIP signaling has large delays compared with the voice
signaling which reduce the VoIP performance and increases the call’s
duration. In addition, GSM and LQS based VoIP calls have an acceptable level
of QoS while PCM and IP-Telephony based VoIP calls have a low level of QoS
over different types of mobility models. Furthermore, the location and the
mobility of SIP server affect the number of hops and the SIP signaling
performance between the different parties of the VoIP call.
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المؤتمر (3):
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عنوان المؤتمر:
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2013 IEEE 14th
International Symposium and Workshops on a World of Wireless, Mobile and
Multimedia Networks (WoWMoM)
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تاريخ الإنعقاد:
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4-7/06/2013
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بلد
ومكان الإنعقاد:
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Madrid,
Spain
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طبيعة المشاركة:
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Research
Paper Presentation
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عنوان المشاركة:
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SIP
over Next Generation mobile ad hoc networks (MANETs)
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ملخص المشاركة:
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Most
of the Future Internet users will be wirelessly connected to IP clouds
through different types of wireless networks. Thus, the number of
applications and devices will be increased, and IPv6 insists to be applied.
Voice over IP (VoIP) is one of the most popular Internet applications which
provide real time voice communications between different parties and network
systems. The Quality of Service (QoS) for VoIP influenced by the performance
metrics which are signaling, bandwidth, packet loss, delay, and jitter. The
signaling is the main parameter that manages and controls VoIP calls. One of
the most efficient signaling systems for VoIP is the Session Initiation
Protocol (SIP). MANETs consist of changeable bandwidth with considerable
delays which affects the VoIP QoS. The first stage of my PhD research is to
evaluate the performance metrics of the SIP based VoIP applications over IPv6
MANET using OPNET modeler with different voice Codecs and Mobility Models.
The evaluation results showed considerable differences in the performance of
the real-time applications between different MANET routing protocols. In
conclusion, SIP acts poorly in IPv6, and both SIP signaling and IPv6 need to
be enhanced for real time applications over MANET.
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المؤتمر (4):
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عنوان المؤتمر:
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2013 Seventh
International Conference on Next Generation Mobile Apps, Services and
Technologies (NGMAST)
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تاريخ الإنعقاد:
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25-27/09/2013
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بلد
ومكان الإنعقاد:
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Prague,
Czech Republic
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طبيعة المشاركة:
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Research
Paper Presentation
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عنوان المشاركة:
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Evaluation
of SIP Signalling and QoS for VoIP over MANETs Reactive Routing Protocols
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ملخص المشاركة:
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In
Mobile Ad Hoc Networks (MANET), delays and bandwidth limitations of the wireless
network system adversely affect the performance of the Voice over IP (VoIP).
The calls setup time and the voice Quality of service (QoS) of VoIP calls
depend on the routing protocol, the mobility model, and the number of hops
between the call parties. Number of research efforts used to study the
performance metrics of VoIP over MANET with even proactive, reactive, or
hybrid routing protocols. In this paper, an evaluation of SIP signaling and
voice QoS for SIP based VoIP calls using GSM voice codec over MANETs with
Static, Uniform, and Random mobility models. This evaluation considered three
types of reactive routing protocols: DSR, AODV, and TORA over IPv4. For SIP
signaling, the evaluation examined the call setup time, the number of active
calls, the number of rejected calls, and the calls duration. For voice QoS,
the evaluation studied the End-to-End Delay, the sent traffic and the
received traffic of VoIP calls. The evaluation results show that AODV has the
best performance over different types of mobility models, then DSR with
Static and Uniform mobility models, while TORA has long delays and poor
performance over all mobility models. This evaluation helps to improve the
performance of VoIP applications over MANETs by studying the most appropriate
reactive routing protocol over different types of mobility models.
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المؤتمر (5):
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عنوان المؤتمر:
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The
8th International Conference on Modelling and Simulation (EUROSIM), IEEE
Computer Society
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تاريخ الإنعقاد:
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10-12/09/2013
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بلد
ومكان الإنعقاد:
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Cardiff,
Wales, UK
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طبيعة المشاركة:
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Research
Paper Presentation
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عنوان المشاركة:
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SIP
Signaling and QoS for ROHC Based Next Generation MANETs Reactive Routing
Protocols
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ملخص المشاركة:
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In
this paper, an evaluation of SIP signaling and voice QoS for SIP based VoIP
using GSM voice codec system over IPv6 MANETs with Static, and Random
mobility models. This evaluation study considered two types of reactive
routing protocols, AODV and DSR. The study examined IPv4, IPv6, and Robust
Header Compression (ROHC) as a compression/decompression system for IPv6
headers. The evaluation results show that SIP signaling and VoIP traffic are
acting poorly over IPv6 even when applying ROHC. In general, AODV has low
performance over different types of Random mobility models for MANET nodes,
while DSR shows better performance with Static mobility models and bad
performance with Random mobility models. When using ROHC for TCP traffic, a
level of enhanced performance had shown for SIP based VoIP calls over IPv6
MANET. However ROHC still has longer delays and poor performance compared
with SIP based VoIP over IPv4 MANET. Therefore, the SIP signaling for IPv6
MANET reactive protocols require further enhancements for SIP/TCP
registration and retransmission timers to be able to employ the capabilities
of IPv6 and ROHC system for SIP based VoIP and real-time applications over
MANET.
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المؤتمر (6):
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عنوان المؤتمر:
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2014 IEEE
International Conference on Consumer Electronics (ICCE)
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تاريخ الإنعقاد:
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10-13/01/2014
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بلد
ومكان الإنعقاد:
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Las
Vegas, NV, USA
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طبيعة المشاركة:
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Research
Paper Presentation
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عنوان المشاركة:
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Perceptual
QoE based resource allocation for mobile 3D video communications
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ملخص المشاركة:
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This
paper suggests a power and bandwidth efficient resource allocation approach
for mobile networks based on consumer’s perception of 3D video. We simulate a
mobile 3D video transmission through which we identify the correlation
between receiver’s signal-to-noise ratio and perceived quality. Our QoE-based
approach is shown to save up to 33.13% in power and grant up to 50% more data
bits for transmission, compared to QoS-based techniques.
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المؤتمر (7):
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عنوان المؤتمر:
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9th International Conference on Next Generation
Mobile Applications, Services and Technologies (NGMAST’14)
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تاريخ الإنعقاد:
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10-12/09/2014
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مكان
الإنعقاد:
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St. Anthony’s College,
University of Oxford, Oxford, UK
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طبيعة المشاركة:
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Conference Paper
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عنوان المشاركة:
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A Cross-Layer Approach to Enhance the Call
Setup Performance of SIP-Based VoIP over AODV MANET
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ملخص المشاركة:
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The implementation of SIP signaling over
MANET is still a challenging issue, as many routing factors affect SIP
performance. Node mobility and dynamic hop number changes between nodes are
considered the main routing problems within MANET routing protocols. RFC 6076
proposed end-to-end performance metrics for SIP signaling to provide a
standardized method of evaluating SIP performance over different platforms,
however, no benchmarking values for these metrics have been proposed yet. In
this paper, a cross-layer system designed to enhance the call setup
performance of SIP-based VoIP over AODV-based MANET is proposed. The approach
used is to employ the SIP performance metric to enhance the call setup time
by adjusting the Time-To-Live (TTL) parameter and the Route Request (RREQ)
message retries for the AODV route request messages to support the reach
ability ratio of SIP INVITE and re-INVITE messages to reduce the call setup
time of SIP-based VoIP. The study investigated the Session Request Delay
performance metric of SIP signaling as part of the SIP over MANET simulation
efforts. Both the call setup time and the number of SIP calls over random
waypoint mobility models were enhanced by applying instantaneous
modifications to the TTL parameter and RREQ retries, increasing the delivery
ratio of route discovery messages to about 35-40% compared with the classic
AODV routing protocol.
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المؤتمر (8):
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عنوان المؤتمر:
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The 8th Saudi Students Conference
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تاريخ الإنعقاد:
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31/01/2015
– 01/02/2015
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مكان
الإنعقاد:
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Imperial College London
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طبيعة المشاركة:
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Poster
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عنوان المشاركة:
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The Principles of Quality Management from
The Producer’s and Customer’s Prospective with a Case Study for Two
Organisations in Saudi Arabia
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ملخص المشاركة:
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The
aim of this research is to identify the quality of service that encourage
employees acceptance of organizations in Saudi Arabia. The employees decision
whether to accept or reject the quality services was studied by using the
framework of the Gap model. This
undertake the usage of service is related two factors service provider
(origination), and Service receiver (employees). This research depended on
two type of data collection, an online questionnaire and a semi-structured
interview. The number of participants in the questionnaire is 95 employees in
two different organizations (University (organization A), and the Medical
Centre (organization B)) in Saudi Arabia, where the samples of the employees
selected at random base selection system. While, the interview conducted with
the supervisor of the Employees Relation Department in the Medical Centre
(organization B). The samples selection of this research allowed for a
variance exploration by examining the previous experience of the
participants. This helped in identifying the behavioral differences employees
in Saudi Arabia to justify the results for different group of service users.
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جوائز التكريم:
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الجائزة (1):
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مسمى الجائزة:
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Research Media’s innovative PhD Portfolio Competition
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الجهة المانحة:
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Research Media, UK
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تاريخ الجائزة:
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24/04/2015
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مجال التكريم:
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PhD Research Efforts
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رابط الجائزة
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Click
here
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