الشبكات المعرفة برمجيا SDN هي عبارة عن بنية شبكية جديدة توفر التحكم المركزي بكامل الشبكة. يعمل هذا المتحكم كنظام تشغيل يقوم بإرسال التعليمات وتطبيق التغييرات من خلال الواجهات التخاطبية بينه وبين الأجهزة المسؤولة عنها ويدعى بالمتحكم.
The demand growing of energy is offset by the weakening of the generating capacity of
power due to the war conditions in Syria. As the windows are the means of optical
communication between inside and outside of the building, the source of the vent
ilation
and the natural lighting, thus having an important effect on the thermal performance of the
building, which affects the consumption of energy.
so the search relied on proposing alternatives for glass to test its thermal performance, the
choice of alternatives was based on the diversity between the values of solar radiation
permeability and the visual light in addition to enumeration of the layers, to which end the
computer simulation method was adopted and the results were compared to a model
Standard (single-transparent).
The results of the comparison showed that the amount of energy saving could be as high as
35% for the face of the sun-exposed facades directly. By reducing the permeability of the
total glass of solar radiation and increasing the permeability of the visible light to increase
the amount of natural illumination, plus the adoption of a Multi-layered glazing system ,
the study recommended that appropriate glass selection must be taken into account in the
early design phase
Decoupling the decision-making process from the data forwarding process is the heart of
software-defined networks technology. One of the most important components of this
technology is the controller, which is the smartest component in the network.
Many of the
controllers have been developed since the technology originated, and many researches
have been done to compare the performance of these controllers for productivity, delay and
protection.
And due to the importance of selecting the appropriate controller according to different
parameters and network states, we studied the performance of four controllers: Floodlight,
Beacon, Nox, RYU in terms of productivity, RTT, time of establishing connection with an
OpenFlow switch and the time for adding an input to the switch flow table. The results
showed that the Beacon control was superior in performance when the number of switches
in the network was equal to the number of processor cores used by the controller. For RTT
and the time needed to add an input to the flow table, the NOX controller achieved less
time. Finally, the Floodlight controller was the best in terms of establishing connection
with the switch because it needed less time.
Software engineering is an important concept for the development of information
systems, which is more than coding or writing of programs, that it includes quality,
scheduling, economics and knowledge of the application of principles. Software is s
ubject
to errors in manufacturing and operation and needs to be evaluated like any other product.
In this research paper, we present a development of the traditional programmatic model
of software engineering using the CRISP-DM methodology, which is primarily used in
data extraction engineering systems, that aims to improve software quality. We study the
effect of introducing this methodology in terms of reducing the number of errors
discovered in software and its impact on error detection at an early stage of the software
life cycle.
The results showed that the use of this methodology helped to reduce the errors
discovered in the software after the development process. It also helped to detect a greater
percentage of errors in the early stages of the software life cycle, which helps to increase
the quality of the software, compared to a relatively low number of lines. Code because of
applying the proposed methodology.
The research aimed to identifying the relationship between the use of information technology and enhance of market share in Syrian commercial Banks. By identifying the extent of the impact of each dimensions of information technology, by determining
the extent to which both the information technology dimensions and the basic requirements of the application of information technology affect market share, the researchers relied on the prescriptive approach and the descriptive approach as a general approach to research, the questionnaire was distributed to 250 senior management in public and private commercial banks, and this study concluded several results, the most important of which was a moral relationship between the use of information technology and the market share, and this relationship is acceptable and positive, and is due to the lack of human resource skills and modern material components, especially in senior management, the researchers have reviewed many important results and made several suggestions and recommendations, the most important of which was the need to develop an appropriate strategy for the use of information technology supporting its operations within the overall strategy of the bank and following up on its implementation and evaluation in order to achieve the basic objectives of the Bank.
Current traditional IP networks start to be complex as the demands of the users are ever-growing. Software Defined Network (SDN) is a new paradigm to ease the management of the network and make the network programmable by decoupling the control plane
and forwarding plane (such as switch and router). A centralized controller is used to manage the control plane, and it interacts with the forwarding plane using a standardized OpenFlow protocol. However, many controllers are used recently such as POX, Ryu, ONOS, and OpenDaylight. The important question is which is the best controller to use in our network and fits our network’s goals? To answer this question, a decision-making method is proposed in this paper. First, four SDN controllers are selected, and five criteria are analyzed to collect these controllers’ properties. Then a Multi-Criteria Decision Making method named TOPSIS is used to rank the controllers and choose the best one. By applying this method, a comparative study is done to evaluate the four controllers in an environment of LAN topology, and “Ryu” controller is selected as the best one based on our criteria.
Device to device Communications (D2D Communications) is a new promising
technology, that is used to increase data exchanged volume, to expand the
coverage area of base stations, core network data offloading, and to move to
new frequency bands that have not been used in mobile networks before.
This study highlights the STEP standard as important standard in
information modeling to model necessary information throughout
the lifecycle of any product exchanging this information among
different systems. During this study, we will try to hig
hlight some
parts of this standard used in software engineering domain and
compare them with used ways in this domain.
This study divides to two parts. The first one highlights the antipatterns
in comparison with design patterns. By the second part,
we suggest a new tool which is able to detect anti-patterns in
early phases of software lifecycle.
In this paper we introduce a specification model for the host migration
process in Software Defined Network, and for verifying the reachability
property for packets that do not change after the migration, and achieve
the required modifications to
meet the same properties.
The model is designed by TLA+ language and verified by TLC which is
correlated with it. The model is implemented by few states to meet the
required property.
