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Register a new userمحاكاة عمل قواعد المعطيات الموزعة في بيئة زمن حقيقي مع تشارك الحمولة
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يلْجأُ عادة لتحسين أداء نظم الزمن الحقيقي استخدام ما يسمى بتشارك الحمولة، و ذلك لرفـع نسبة ضمان المهام المقدمة للشبكة المكونة من عدة عقد تعمل بتعاون و انسـجام مدروسـين. تقسم المهام الواردة للعقدة إلى: ١ – مهام مضمونة: يمكن ضمان تنفيذ هذه المهام خلال زمنها الحرج على العقدة نفسها. ٢ – مهام غير مضمونة: لا يمكن ضمان تنفيذ هذه المهام خلال زمنها الحرج على العقدة نفسها. لتنسيق عمل مجموعة عقد الشبكة يتم توصيل جميع هذه العقد إلى المشرف العمومي، الذي يقوم بتحصيل معلومات حالة العقد بشكل دوري و دائم. يقوم المشرف العمومي بالإشراف على نقل المهام غير المضمونة إلى عقد أخرى قادرة على ضمان تنفيذها، مما يؤدي إلى رفع نسبة ضمان المهام على الشبكة و هي البارامتر الأهم فـي الدراسة.
No English abstract
References used
Al-Dahoud, Ali,” A Dynamic Cluster Construct for Load Balance in Big Heterogeneous Distributed Systems “ , 2001 international Symposium on Performance Evaluation of Computer and Telecommunication Systems , Orlando,Florida , july
Krishna, C.M., and Shin, K.G (1997),” Real-Time Systems”, The McGraw-Hill Companies, Inc
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The volume of data being generated nowadays is increasing at
phenomenal rate. Extracting useful knowledge from such data
collections is an important and challenging issue. A promising
technique is the rough set approach, a new mathematical method
to data analysis based on classification of objects into similarity
classes, which are indiscernible with respect to some features. This
paper focuses on discovering maximal generalized decision rules
in databases based on a simple or multiple regression, generalized
theory, and decision matrix.
The mentioning relational database system term has become a synonymous to
database system, but the monopoly of big companies that work in database systems field
has become an obsession for persons who work in this field, because of the high costs o
f
this systems. For this reason the concerns turn towards the advanced technique : the native
XML database systems which are free or most of them are open source systems because of
the increasing dependency on XML files and particularly in transporting data between
different applications and the availability of collections of related files. This has
summoned towards a system to manage and organize them, for this reason the NXDs
appeared. The aim of this study is making a comparison between the capabilities of
RDBMS and NXDs in accordance to multiple standards , investing these two techniques
in practical application , make the relevant tests which reflect the use of these techniques
on the suggested application , display the results and give future suggestions.
An increasingly common requirement in distributed network environments is the need to distribute security mechanisms across several network components. This includes both cryptographic key
distribution and cryptographic computation. Most proposed se
curity mechanisms are based on threshold cryptography, which allows a cryptographic computation to be shared amongst network
components in such a way that a threshold of active components are required for the security operation to be successfully enabled. Although there are many different proposed techniques available, we feel that the practical issues that determine both what kind of technique is selected for implementation and how it is implemented are often glossed over. In this paper we thus establish a new framework for network security architects to apply when considering adoption of such mechanisms. This framework identifies the critical design decisions that need to be taken into account and is intended to aid both design and implementation. As part of this framework we propose a taxonomy of management models and application environments. We also demonstrate the utility of the framework by applying it to a VPN environment.
أصبحت جميع المواقع الموجودة على الشبكة العنكبوتية والمخدمات تهتم بأمور السرية التامة في مواقعها بالإضافة إلى عمليات تطوير حماية البيانات الخاصة بها
There was within the last 50 years a lot of database applications in which time plays an
important role. These applications revealed a lack in time support within the current DBMSs as
the application should give the data the temporal semantics rela
ted to it, also to check the
temporal constraints. Therefore, researches were made in order to embed this temporal
semantics and constraints in the DBMS itself, also to provide a new query language that can be
tagged as “temporal”.
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