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Register a new userLocalization of fourth generation wireless networks using WiMAX technology Implementing a wireless network throughout Syria
توطين الشبكات اللاسلكية الجيل الرابع باستخدام تقنية wimax تطبيق شبكة لاسلكية على كامل الاراضي السورية
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Added by
Syrian Virtual University رسالة ماجستير
Publication date
2015
fields
Network Engineering
and research's language is
العربية
Created by
Shamra Editor
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يشكل النطاق العريض اللاسلكي نقطة الالتقاء بين اثنتين من اكثر قصص النمو أهمية في صناعة الاتصالات . حيث حققت خدمات النطاق العريض نجاحاً كبيراً في السنوات الأخيرة وهو الأمر ذاته الذي حصل مع تقنيات الاتصالات اللاسلكية.
Wireless broadband is the meeting point between two of the most important growth stories in the telecommunications industry. Broadband services have achieved great success in recent years, as has wireless communication technologies.
References used
الشركة السورية للاتصالات . (2011) التقرير السنوي
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The current researches are moving towards more development in order to provide the
growing the needs of users such as support real-time applications, quality of service,
particularly; the high data rate transfer and other. That prompts the network
service
providers to integrate many properties for different networks resource, and support
providing the service "anywhere and anytime".
Hence, the importance of this research, which aims to study the vertical handover as
very important and necessary step to provide the mobility of mobile nodes between the
different networks by using Media Independent Handover (MIH) IEEE802.21standard
which is developed in January 2009. In this paper, the performance of vertical handover
between these two networks is evaluated taking into account many parameters such as
packet loss, handover latency, and throughput, using NS2 simulator (Network Simulator
version2) which includes a support for MIH technology by the National Institute of
Standard and Technology (NIST).
Wireless Broadband is the meeting point between two of the most important growth stories in telecommunications industry . The broadband technologies have achieved great success in recent years , which is the same thing that happened with wireless com
munication technologies
The fourth fillial generation with their parents p1 and p2 for four crosses in
six row barley (Hordium vulgare L.): Jezera1 x Badya, Tadmer x Arivat,
Rehan x Bendict and Rum x Forest. The seeds were planted in 2007 using
R.C.B.D. with four replica
tions. The data were recorded for the traits; maturity
time, number of spikes, spike length, grain yield, weight of 1000 grains and
number of grains per spike, to estimate average degree of dominance,
heritability and expected genetic advance from selection.. The results showed
that over dominance were presence for the studied traits. The values of broad
sense heritability were high for the studied traits in the all crosses. The values
of narrow sense heritability were (1) high for number of spikes in the all
crosses, maturity time, grain yield and spike length in the second and fourth
crosses and weight of 1000 grains in the second cross(2) low for the weight of
1000 grains and number of grains per spike in the fourth cross.(3) moderately
for the other traits. The results of this study indicated that selection will be
effective to obtain superior strains in the four crosses for the studied traits
except spike length and weight of 1000 grains in the second cross. Therefore
recurrent selection will be suggested to increase the desirable genes.
في هذا المشروع سوف نستثمر مجموعظة من الأدوات الرياضية من خوارزميات تعلم الآلة machine learning و الأمثلة المحدبة convex optimization و "النماذج الاحتمالية البيانية" probabilistic graphical model في إطار "الشبكات المعرفية" cognitive networking وذلك
لأمثلة optimize أنواع مختلفة من الشبكات اللاسلكية مثل: شبكات الحساسات اللاسلكية WSN ، و الشبكات التكتيكية الهجينة
tactical networks ، و الشبكات المحلية اللاسلكية WLAN . تتمثل "الشبكات المعرفية" في تطبيق "معرفة"
cognition على كامل مكدس البروتوكولات protocol stack لتحقيق أهداف الأداء، بخلاف "الراديو المعرفي"
cognitive radio الذي يطبق المعرفة فقط على الطبقة الفيزيائية.
Mobile Ad-Hoc Networks are used for data transfer. The nodes of such
networks do not require presetting. They are characterized by dynamic
data transfer during their movement of the nodes. MANET could be
targeted by potential security breaches. Bl
ack hole attack is one of the
serious attacks targeting wireless AD_HOC networks through a false
point whichcan absorb data and send them to another place or neglect
them. This is due to the lack of central control node which is able to
manage communications. This research investigates the effects of the
black hole on the performance of hybrid routing protocol Temporally
Ordered Routing Algorithm (TORA) and proactive routing protocol
Optimized Link State Routing (OLSR) for a variable number of mobile
nodes in different speeds in a high load environment.
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