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اختيار السمات في مصادقة التواقيع الديناميكية
No full textنقوم في هذا البحث بمعالجة مشكلة تحديد مجموعة السمات المناسبة التي تساعد على استخدام التواقيع في مصادقة الهوية بطريقة صحيحة. هناك مجموعة كبيرة من السمات التي يمكن الحصول عليها إما مباشرة من الإشارة الأصلية أو تشتق منها. وإذا أخذنا بعين الاعتبار كامل المجموعة فإن عملية مصادقة التواقيع تكون مستهلكة للوقت. وعلاوة على ذلك، ليس كل السمات ذات علاقة بهذه العملية، وبعضها يشكل فائضاً. وبالتالي فإن تقليص مجموعة السمات بهدف الحفاظ على السمات ذات العلاقة وغير الفائضة فقط هو شرط أساسي لتحقيق مستوى أفضل من الدقة. هذه المشكلة هي مسألة توافقية في طبيعتها وتتطلب إيجاد الحل الأمثل لها. في هذا العمل، تم استخدام استراتيجية تحسين سرب الجسيمات كمية الحركة (كيو بي اس او) لتنفيذ اختيار السمات، حيث تم تمثيل كل مجموعة ممكنة بالقيم الثنائية. كما تم اختبار النظام المقترح من خلال عدة تجارب، باستعمال قاعدة بيانات التواقيع الديناميكية اس في سي 2004 و تم الحصول على نتائج مذهلة. إن عدد السمات المميزة المستخلصة بواسطة هذا البحث يساوي 51 سمة من أصل 110 تم استعمالها في الحل المقترح. النظام المقترح يعطي مقياس معدل الخطأ المتساوي (اي اي ار) بمقدار 0.19 ٪ ، مما يثبت فعالية النظام المقترح و يجعله منافساً لغيره من الأنظمة الموجودة
A Review of Malcious Code Detection Techniques for Mobile Devices
No full textWith the advent and rising popularity of wireless systems, there is a proliferation of small-enabled devices such as PDAs, mobile phones, etc. While these devices are becoming more and more preferable by all age groups, they also pose the threat of being vulnerable to malicious code (e.g.: viruses, trojans, worms, etc). In fact, the mobile devices rely on open and public transmission media. Besides, open platforms are becoming popular in smart phones. In this context, these devices have become more capable, providing users with all conveniences, ranging from traditional phone usage to supporting multiple features like e-mail access, playing games, software downloading and also e-banking. As the capabilities of these devices increase, the threat of malicious code (also called malware) targeting them also increased. It is believed that the evolution of mobile malware will take a similar direction as the PC malware. In this paper, we conducted a questionnaire based survey to know about the mobile device security concern among the users. The results indicate a high awareness but a low use of strong security measures. Then, we explore the various mobile phone vulnerabilities. A review of malicious code detection techniques for mobile devices are presented and discussed
Arabic Educational Programs for Children with Learning Difficulties
No full textIn this paper, we describe the design of interactive educational programs for Arabic-speaking children with Learning Difficulties (LDs). The programs were developed in the context of a software engineering course and focused on two reading and writing skills that are known to be challenging for school-aged children with LDs. Using this computer-based learning program enables a profile of achievement and progress to be automatically generated, and has the potential to be an affordable and targeted method of remedial learning for children receiving support for their LDs in resource rooms of schools
Improved CBIR through Combined Indexing Techniques
No full textMultimedia databases get larger and larger in our days. There are various aspects that affect the demand for efficient database techniques to manage the flood of
multimedia data, namely the increasing number of objects, the increasing complexity of objects. Whereas traditional indexing structures cope with large numbers of simple objects, complex multimedia objects require more sophisticated indexing
techniques. In this paper we discuss the current state-of-theart of various indexing technique as seen from content-based image retrieval point of view and proposed a novel approach named Hierarchical Hash Grid Indexing structure which has excellent performance and capable of handling huge number of images with less response time
Power-Aware Linear Programming Based Scheduling for Heterogeneous Computer Clusters
No full textIn the past few years, scheduling for computer clusters has become a hot topic. The main focus has been towards achieving better performance. It is true that this goal has been attained to a certain extent, but on the other hand, it has been at the expense of increased energy consumption and consequent economic and environmental costs. As these clusters are becoming more popular and complex, reducing energy consumption in such systems has become a necessity. Several power-aware scheduling policies have been proposed for homogeneous clusters. In this work, we propose a new policy for heterogeneous clusters. Our simulation experiments show that using our proposed policy results in significant reduction in energy consumption while performing very competitively in heterogeneous clusters
Distributed Denial of Service Attacks Detection Using Support Vector Machine
No full textNeural Network Intrusion Detection (NNID), Support Vector Machine (SVM), Cooperative Association for Internet Data Analysis (CAIDA), Distributed Denial of Service (DDOS
TOWARDS ABET ACCREDITATION FOR A SWE PROGRAM: ALTERNATIVE STUDENT ASSESSMENT TECHNIQUES
No full textThis paper describes assessment techniques utilized for assessing undergraduate students studying in a software engineering program. The purpose behind this work is to get the program accredited by the Accreditation Board for Engineering and Technology (ABET). Therefore, a number of applied direct and indirect assessment techniques are described. These techniques are implemented towards the end of the semester to assess the extent to which the student and course outcomes are satisfied. Consequently, results are obtained and analyzed and various learning issues are eventually identified. Finally, the paper provides suggestions for improvement in course delivery as well as student learning mechanism
مسألة استجابة القارئ وتلقيه عند : ياوس – إيزر – بليخ – ستانلي فيش
No full textيحاول هذا المقال أن يسهم في تتبع مسألة القراءة النقدية للقارئ وتوليد الدلالة, وفعالية تلقيه للنصوص, وبلورة مفهوم " أفق الانتظار", ثم موقع القارئ في العملية النقدية ومغامرة القراءة والتفاعل بينه وبين النص وتجربته الذوقية للنصوص, التي نريد أن نسلك بها من خلال منظري نظرية القراءة واستراتيجية التأويل ومن خلال نظرة مشاريعهم النقدية للقارئ, محاولين أن نستشرف آفاق محطات النقد والقراءة والتأوي
Power law fluid model for blood flow through a tapered artery with a stenosis
No full textIn the present paper, blood flow through a tapered artery with a stenosis is analyzed, assuming the flow is steady and blood is treated as non-Newtonian power law fluid model. Exact solution has been evaluated for velocity, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different types of tapered arteries (i.e. converging tapering, diverging tapering, non-tapered artery) have been examined for different parameters of interest. Some special cases of the problem are also presented. (c) 2011 Elsevier Inc. All rights reserved
Arab Students’ Perceptions of Strategies to Reduce Memorization
No full textThis paper addresses student perceptions of the effectiveness of strategies that encourage understanding and retention of information, and reduce dependence on memorization. This work is of particular importance in Saudi Arabia where students are taught to memorize information throughout their schooling, beginning in elementary school (Al-Mohanna, 2010; Al-Rashudi, 2002; Rugh, 2002).
Inside classrooms that encourage memorization, the teacher’s role is quite clear: the teacher dominates, decides what students should learn and is seen as the only source of information. There is no attempt made to engage the student in any interaction with the teacher or other students.
To reduce dependence on memorization, students need to actively engage with the material, reflect on it and finally retain the material because it is understood. To achieve this with university students, it has been suggested that teachers should not depend solely on the lecture as the method of instruction (Luckey [in Fasko, 2003]; Underwood & Wald, 1995). Having students read before class, respond to and use effective questioning, and work in groups, helps facilitate student comprehension. These strategies were among the ones used in the classes under study.
Research was done in the female section of the English Department at a University in Riyadh, Saudi Arabia. One hundred fifty-six students were involved in the project in classes conducted over two semesters. Student perceptions of the effectiveness of strategies are based on an analysis of questionnaire responses and student comments. The paper also addresses the study implication