Providing a good Quality of Service (QoS) for all users is a big challenge in Cellular Networks, as soon as the number of users increases the demand on Internet service increases too especially with using the current technology of today. While on mov
e a user needs Internet connectivity with good Quality of Service and minimum call dropping probability.
Cellular IP presents a good solution mobility as it supports highly mobile users, users' needs are becoming larger and more multifarious (files downloading, video streaming, sending an e-mail….) there for the need for efficient way to improve QoS is necessity.
Bandwidth is the most important factor in Cellular IP Networks, for improving QoS in Cellular IP Networks a model for bandwidth management is presented in this paper, the model presented here is based on borrowing bandwidth reserved to non-real-time users using Particle Swarm Optimization (PSO) the proposed model preserves a low bandwidth threshold for the ongoing non-real-time calls. This threshold is the security limit that keeps non-real-time calls from being dropped. This research models handoff process and proposes a technique that gives the lowest percentage of dropped and blocked hand offs. Simulation results show the efficacy of the proposed model.
This Paper discusses the mathematical modeling of the source traffic using Poisson, Pareto, and Weibull distributions along with performance comparison considering these three types of traffic generators: (1) Poisson distribution for modeling the BL
( Pos BL ) and Exponential distribution for modeling the GT ( Exp GT ), the corresponding traffic generator represented by / Pos Exp BL GT ; (2) Pareto distribution for modeling the BL ( Par BL ) and Pareto distribution for modeling the GT ( Par GT ), the corresponding traffic
generator represented by / Par Par BL GT ; and (3) Pareto distribution for modeling the BL ( Par BL ) and Weibull distribution for modeling the GT ( Wb GT ), the traffic generator represented by / Par Wb BL GT . Nonbursty traffic was modeled vsing Poisson distribution for burst length and exponential distribution for gap
time whereas bursty traffic modeling was achieved through heavy tailed Pareto and Weibull distributions.
The comparison between the three traffic generators has been verified through simulation for six sources Examining the simulation results for Allowed Cell Rate (ACR) and Memory Access which indicate the performance of the switch under / Pos Exp BL GT , / Par Par BL GT , and / Par Wb BL GT traffic generators, It is seen that the switch offers best performance under / Par Wb BL GT traffic generators.
Real-time multimedia transport over MANET has stringent bandwidth, delay, and loss requirements. It is
a great challenge to support such applications in wireless ad hoc networks, which are characterized by
frequent link failures, congestion, and lack of central administration.
The study aims to investigate hotel service quality effect on customer loyalty, by determining service quality dimensions (responsiveness, tangibility, sympathy) effect on customer loyalty. The study conducted on convenient sample of hotel customers
in Lattakia.
The study results show that hotel service quality affects customer loyalty. Whereas there is a positive relationship between hotel service quality and customer loyalty. Tangibility has the largest effect of service quality dimensions on customer loyalty, then responsiveness and finally sympathy.
This research aims to study the relation between the usage of computer and the quality of service in the managerial office in TISHREEN university by measuring the. A questionnaire of (169) copies has distributed to employees in the university, and an
other questionnaire has distributed to (247) college students in the university.
The main finding of the research can be summarized as follows:
- The average of usage the computer in the office and the average of service’s responsiveness and service’s reliability is low.
- There is a positive relation between the usage of computer and the quality of services that produce in the managerial office in TESHREEN University.
The study aimed to investigate labor turnover rate effect on tourism service quality, by determining labor turnover rate effect on service quality dimensions (reliability, sympathy). The study conducted on sample of managers ,labor and hotel customer
s in in the Syrian Coast.
The study results show that labor turnover rate affects tourism service quality. Whereas there is a relationship between labor turnover rate and service quality. and that there is an acceptable relationship between reliability and the labor turnover rate and a weak relationship between sympathy and the labor turnover rate.
In given the great developments in the banking environment and
increased competition between banks, maintaining the existing
customers of the banks has a great interest by the banks, in the sense
that they prevent their move to deal with other ban
ks, as well as attract
new customers.
this research attempts to examine The impact of some of factor like
trust and service quality on customer loyalty in BBSF.
The desire to improve the overall performance of IP network leads to designing new
QoS achitectures. The new Enhancement in providing quality of service (QoS) on the
Internet is based on the Different Services (DiffServ). DiffServ divides traffic i
nto small
classes and allocates network resources on a per-class basis. In this architecture, packets
are marked with different DiffServ code points (DSCP) at edge routers, and the priority for
packets is given via the value of this field. On the other hand, MPLS is a fast forwarding
mechanism that depends on Label's. The main advantage of MPLS is its support for traffic
engineering which results in best utilization of network's resources like link capacity. The
integration of using MPLS (as a forwarding mechanism) with DiffServ (as a QoS
mechanism) offer high Quality of service especially for real time applications (such as
VoIP, Video Conference).
We evaluate the performance of MPLS-DiffServ networks in our research. We study
QoS metrics as delay, variation of delay, upload response time, link utilization, packet loss
for several kinds of traffic (Voice, Video, FTP) by using OPNET Simulator and we
showed its superiority over MPLS network and pure IP ones. We compare our results with
MPLS networks and pure IP ones. Our results showed superiority of MPLS-DiffServ over
other kinds of networks. This is clear in decreasing delay ,delay variation, upload response
time, queuing delay, reduction of lost packets and best utilization of link capacity.
The research aims at finding out the role of the electronic banking services provided
by the Commercial Bank of Syria in increasing customers' satisfaction, as well as focusing
on customers' satisfaction because of its importance and its role in ac
hieving the
competitive advantage in the delivery of services in the banking sector, which represents
an area of competition between public banks and private banks. Also, it aims at stating the
extent of the employees' participation in the bank under study regarding their eagerness to
achieve customers' satisfaction.
At the end, the research presents a summary of the most important findings. It also
presents some proposals and recommendations that will further improve the level of
electronic banking services and achieving customers' satisfaction inorder to compete at a
global level through a field study using a questionnaire designed for this purpose.
This research aims at evaluating service quality at tartous call
center in Syrian Coast. This is achieved by concentrating on the
service performance ( SERVPERF) to measure the recognized
service quality. The data for this research were collected using a
questionnaire . 200 had been distributed. 179 were returned, which
amounts for 89.5% of the distributed questionnaires.
