Distributed Denial of Service attack (DDOS) on Vehicular Ad Hoc Networks
(VANETs) is considered to be one of the most serious types of attacks that can be targeted
to those networks. The danger of this attack is in the difficulty of detection becau
se of the
cooperation of several attacking nodes in the network, and its impact on the availability
requirement that is one of the most important security requirements in a network offering
real-time applications .In our research, we study the effect of this attack on VANET
network in the city, taking into consideration two cases. In the first case the target of the
attack is the nodes, while in the second one, the target is the road side units (RSU).
Simulation results have shown that this attack has a significant impact on both cases, by
comparing the basic parameters of the network, such as throughput in/out and the number
of dropped packets, before and after the attack.
A lot of research directed its concern to the reliability of Wireless Sensor Networks
(WSNs) used in various applications, especially in early detection of forest fires to ensure
the reliability of warning alarms sent by sensors and reduce the aver
age of false warnings.
In this research we have tried to evaluate the reliability of WSN used in early
detection of fires in Fir and cedar preserve, mainly. By designing hybrid WSN network,
similar to the terrains of the preserve and modeling it using program Opnet14.5. We have
studied several scenarios, to allow increasing malfunction of the network resulting from
fire break out and spreading: starting in allowance of 0% and comparing its results the
results of mathematical equations of reliability according to the same scenarios. In
addition, we have calculated the final availability through suggesting a mechanism to
improve WSN reliability using the redundancy, i.e add sensitive spare nodes, which
replace the damaged ones as the result of fire. The results have proved the remarkable
increasing of reliability. Also, it has been predicted of the reliability of the network
designed according to reliability of different values of the nodes used by using one of the
reliability devices "the Block Diagram".
This research includes evaluating the work of maintenance of themachines through
their own key performance indicators (KPI), and approved byindustrial and service
companies, We mention reliability, readiness ,average time between failures, average
Repair time ,average time of periodic maintenance of their production and
serviceequipment.
After the data processing of emergency failures and periodic maintenanceof
machines , we extracted values for maintenance performanceindicators, we measured
their performance and correlation to evaluateits compatibility with global indicators.
The research aim to assess the current situation through the use ofquantitative
methods pattern which is used to access the values of theprevious mentioned performance
indicators and their interdependence tobe used in support of maintenance decisionsin the
container terminal later.
We noticed a strong inverse association between periodic maintenance TPMtime and
breakdown TBD, and reached a value rERS = -0.99, and thereforewe must focus on
increasing periodic maintenance to reduce breakdowntime, and replace parts that cause
recurringproblems which caused about intensive breakdowns, thus reducing
periodicmaintenance time.
Also we were able to classify the quality of maintenance and machinesthrough the
readiness and reliability indicators and the mean timebetween failures.
