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Register a new userA Study of the Physical Layer Built-in Security for CDMA systems
دراسة السرية المبنية ضمنياً في الطبقة الفيزيائية ضمن أنظمة الوصول المتعدد بتقسيم الشيفرة
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Aِl-Baath University ورقة بحثية
Publication date
2016
fields
Informatics Engineering
and research's language is
العربية
Created by
Shamra Editor
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تم في هذا البحث دراسة و تحليل سرية البيانات و سلامتها في أنظمة الوصول المتعدد بتقسيم الشيفرة IS-95 CDMA.
In this research, the reliability and security weakness of the existing CDMA are studied and analyzed.
References used
R.K. Nichols and P. C. Lekkas. Wireless Security: Models, Threats, and Solutions. McGraw-Hill Telecom, 2002
Muxiang Zhang, Christopher Carroll, and Agnes Hui Chan. Analysis of IS-95 CDMA voice privacy. In Selected Areas in Cryptography, pages 1–13, 2000
TIA/EIA/IS-95-B. Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System, 1998
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A child friendly city is a city, or any local system of governance, committed to
fulfilling children‘s rights. It is a city where the voices, needs, priorities and rights of
children are an integral part of public policies, programs and decisions.
As a result, it is a
city that is fit for all. Today, Damascus city rate poorly in terms of the child friendly status.
Due to modern planning and zoning practices, planning for the car and uncontrolled
growth, children of Damascus are growing up unhealthy, obese and depressed. This
research reviews the studies done on the built environment that is convenient for the
child‘s physical, mental and social health and safety. For the purpose of this research, 64
children (28 girls and 36 boys) aged between 10-14 years, along with their parents were
interviewed and asked to describe their perception and experience of the built environment
of the New City of Damascus to meet their needs. Then, the research analyses and
evaluates the Traditional Damascus Built Environment in order to consider key planning
and designing factors that could be learnt through looking at the way the Traditional Built
Environment providing for children‘s needs, and using this as the blueprint for designing
child friendly neighborhoods of new and damaged neighborhood of Damascus City.
The aim is to create rules to be followed by architects for economical
compund building designs. This aim is to be achieved by confirming
economy houses pattern within new environmental planning and joining
them to Islamic concepts, and confirming
the concept of economy in internal
Spaces, through a comparison between new houses and traditional ones.
This paper aims to study the distribution of free nitrogen atoms through surface of α – Fe sample using the numerical solution for linear differential equation by means of Crank – Nicolson method at a temperature range ( 550 to 950 0C) and time inter
val (0 – 8)h where the nitrogen diffusion constant is at 850 0C and 8h.
Under the supposed condition this study has illustrated that the diffusion depth of nitrogen atoms from surface towards inners reaches to ̴ 1.2mm, i.e., determining the layer thickness of the formed nitride compounds which gives the surface layer of α – Fe high resistance against corrosion processes resulting from surrounded environment.
The process of water infiltration into soil provides the soil and groundwater with
water. It also affects runoff formation and soil loss. When the soil of a site is
homogeneous, the infiltration characteristics of its surface layer depend on the ve
getation
cover and human activity. The purpose of this study is to determine the hydro-physical
properties which affect infiltration into the soil surface layer at Snoubar Jableh Plantation
Site (Lattakia). This is in order to illustrate the impact of vegetal cover and human activity
on infiltration characteristics of soil. For this purpose, 20 field infiltration experiments
using a single ring were conducted on patches of coniferous and broad-leaved trees. The
results indicate that the soil has good infiltration characteristics, except in the oak plot
which showed low Ks in comparison with other species plots due to soil compaction and
human activity. The results also indicate that the decomposed organic material layer under
conifers protect soil against compacting and improve infiltration characteristics.
There has been much interest in photonic and spectroscopic devices that are
useful for controlling transmission and reflection coefficients such as multilayer
thin films, photonic crystals, and various Bragg structures in the form of
molds or multilayer thin films.
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