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Intelligent Systems and Agents 2008, MCCSIS'08 - IADIS Multi Conference on Computer Science and Information Systems

作者： Ahmad, Munir Qadir, Muhammad Abdul Razaque, Abdul Ullah, Muhammad Sana Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

ISBN: (纸本)9789728924607

semantic cache reduces the latencies of retrieving of data over distributed system by reusing already retrieved data. It improves the performance (response time) of the system with limited bandwidth. Cache management and query processing over semantic cache are two major activities which should be handled carefully. Query processing plays a major role to reuse the retrieved data efficiently. Efficient query processing algorithms made the semantic cache more efficient. This paper identifies four issues that became the cause of decreasing the efficiency of query processing's algorithm. Solution is also provided to identified issues to improve the efficiency of query processing. Improvement in efficiency is discussed along each of the issue. Efficiency analysis for enhanced algorithm is also provided. © 2008 IADIS.

关键词： Query processing

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A framework for ontology evaluation

A framework for ontology evaluation

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16th International Conference on Conceptual Structures, ICCS 2008

作者： Fahad, Muhammad Qadir, Muhammad Abdul Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

Mapping and merging of multiple ontologies to produce consistent, coherent and correct merged global ontology is an essential process to enable heterogeneous multi-vendors semantic-based systems to communicate with each other. To generate such a global ontology automatically, the individual ontologies must be free of (all types of) errors. We have observed that the present error classification does not include all the errors. This paper extends the existing error classification (Inconsistency, Incompleteness and Redundancy) and provides a discussion about the consequences of these errors. We highlight the problems that we faced while developing our DKP-OM, ontology merging system and explain how these errors became obstacles in efficient ontology merging process. It integrates the ontological errors and design anomalies for content evaluation of ontologies under one framework. This framework helps ontologists to build semantically correct ontology free from errors that enables effective and automatic ontology mapping and merging with lesser user intervention.

关键词： Ontology

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ACID: Adaptive, convergent, and intelligent fault monitoring for distributed systems

ACID: Adaptive, convergent, and intelligent fault monitoring...

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International Conference on Emerging Technologies, ICET

作者： Shujaat Hussain Muhammad Abdul Qadir Center for Distributed & Semantic Computing Mohammed Ali Jinnah University Islamabad Pakistan

Fault monitoring is an important issue to be addressed for fault tolerant distributed system. With the help of an efficient fault monitoring scheme, it would be easy to determine the crash and quickly take the recovery steps. Fault monitor typically detects faults by sending and receiving messages to remote objects. One of the major responsibilities of the monitor is to adapt timeouts according to the dynamic network and system conditions, and set timeouts very close to the real delays in the system. The timeouts must not fluctuate with large amplitudes around the actual time delays. It should not adapt with sudden transients behaviors. Otherwise the number of false alarms would increase, which may trigger a heavy fault recovery mechanisms. The relationship between timeouts and monitoring intervals need to be managed intelligently. Our technique adapts the timeout on the previous history which gives us a fair idea about the work load and we use it to our advantage. When we tested the existing schemes against the three points just mentioned, to our surprise, none of the scheme complies with these points. We experimented with our technique along with some other proposed techniques, our scheme; ACID gave very good results when compared with the schemes.

关键词： Remote monitoring Fault tolerant systems Computer crashes Object detection Fault detection Condition monitoring Delay systems Delay effects History Testing

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SCAD-XML: semantic Cache Architecture for XML data files using XPath with cases and rules

SCAD-XML: Semantic Cache Architecture for XML data files usi...

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IEEE International Conference on Multi Topic

作者： Muhammad Sanaullah M. Abdul Qadir Munir Ahmad Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

The importance of the cache is very apparent in the field of computer science. The semantic cache increases its significance by attaching additional meaningful information with the queried data in the cache. XML is used to provide the structure for the data available on the Web. Therefore it is widely used in many organizations for transmitting the data. The structure of XML data files is different from traditional databases. XML data files stores the information in the form of tree. With the recommendation of W3C XPath is used for queering the information which contained in XML data files. For storing the information related to the XML data files, semantic cache should be maintain in such a way that will support the structure of the XML data files as well as the meaning of the queried data. In this paper an architecture known as SCAD-XML is presented which support the semantic cache for XML data files. A new scheme is introduces to support the data and the related information of the data in the cache. This scheme is based upon semantic overlay tree. An algorithm of the imperative component of query processing is also represented, which works under the certain rules. The rules are defined by viewing all the aspects of the queries that are posted by the user.

关键词： XML Database languages Computer architecture distributed computing Computer science Joining processes Query processing

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Enhanced adaptive, convergent and intelligent fault monitoring in distributed systems (eACID): Working and analysis

Enhanced adaptive, convergent and intelligent fault monitori...

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IEEE International Conference on Multi Topic

作者： Shujaat Hussain Muhammad Abdul Qadir Center for Distributed & Semantic Computing Mohammed Ali Jinnah University Islamabad Pakistan

Fault monitoring is an important concern to be addressed for distributed system. With the help of an efficient fault monitoring scheme, it would be easy to determine the crash and quickly take the recovery steps. Fault monitor typically detects faults by sending and receiving messages to remote objects. We enhanced our technique ACID further with experimenting with giving precedence to the most recent response in the queue and reducing the influence factor of the last response. We tested the enhanced technique eACID to the parameters i.e. adaptiveness to the environment, convergence to the optimal value of timeout and self intelligence for not loading or pushing the object that is being monitored . We experimented with our technique along with some other proposed techniques, our scheme; eACID gave better results when compared with the schemes.

关键词： Condition monitoring Remote monitoring Detectors Computer crashes Fault detection distributed computing Object detection Delay effects Vehicle crash testing Automatic testing

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Analyis of TCP variants at various link error rates under mobility aware Anchor Point Node Hybrid Network

Analyis of TCP variants at various link error rates under mo...

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Proceedings of the Mosharaka International Conference on Communications, Signals and Coding, MIC-CSC

作者： Abdul Razaque S. Hammad Khalid Banuri Khurram Shahzad M. Abdul Qadir Munir Ahmad Center for Distributed & Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

The explosion of new promising technology and their requirement to communicate transparently has signified the need of efficient mobility management in the communication. The emerging networks have not controlled the communication gap between urban and rural territories. To remove the gap of data communication in both territories, we have introduced Hybrid Network with Anchor Point Node (APN), which is particularly effective for rural areas. The proposed network has been simulated with different static & mobility based scenarios with some existing TCP flavors. Therefore, to analyze the taxonomy & behaviors of TCP variants, as various link error rates are created in APN Hybrid Network. The main focus of the paper is to report the good put performance of TCP flavors at different link error rate and effect of link error rate in loss of good put.

关键词： Error analysis Data communication Wireless networks Web and internet services distributed computing Explosions Mobile radio mobility management Communication system control Taxonomy Focusing

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S-point A semantic based E-learning content development tool

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Journal of Applied Sciences 2008年第1期8卷 127-133页

作者： Ihsan, Imran Rehman, Mohib Ur Ahmed, Mobin Uddin Qadir, M. Abdul Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Jinnah Avenue Blue area Islamabad Pakistan

Microsoft® PowerPoint is the most popular e-learning content development tool. The effectiveness and easy to use of PowerPoint together with third party tools seems to make the idea to develop-e-learning with PowerPoint work but PowerPoint carmot be considered as a premier e-learning tool. The reason might be the drawbacks of PowerPoint in terms of its file size, inter-operability and openness. This research describes architecture of a new e-learning content development tool that not only has the look and feel of PowerPoint but also overcomes the drawbacks of PowerPoint. We call! this tool as S-Point-A semantic Based eLearning Content Development tool that is based on the Open Reusability Benchmark. With help of this tool teachers can develop learning objects that are more semantically meaningful and semantically searchable. © 2008 Asian Network for Scientific Information.

关键词： Reusability

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Automated model based software Test Data Generation System

Automated model based software Test Data Generation System

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International Conference on Emerging Technologies, ICET

作者： Muhammad Farhan Bashir Syed Hammad Khalid Banuri Center for Distributed and Semantic Computing (CDSC) Mohammed Ali Jinnah University Islamabad Pakistan

Testing is an important construct of software development lifecycle. It validates that the application under test is doing exactly what it was developed for. In other words, testing ensures the reliability of software. On contrarily, testing is the most difficult, time consuming and costly construct of software development, where as test data is the back bone of testing because it decides the actual test. Generating inputs (test data) to test software is really a difficult process. This paper on one hand covers a survey on code based test data generation techniques and their weaknesses. On the other hand it extends the paradigm of Test Data Generation System allowing it to incorporate both specifications and model based testing. This helps us to perform the reclassification of code, specification or model based techniques. The enhancement in the test data generation system allows us to perform testing of these three classes on the same platform. We have also presented the case study in order to validate the discussions.

关键词： Automatic testing Software testing System testing Programming Application software distributed computing Performance evaluation Computer architecture Bones Humans

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Warnings for disjoint knowledge omission in ontologies

Warnings for disjoint knowledge omission in ontologies

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2nd International Conference on Internet and Web Applications and Services, ICIW'07

作者： Qadir, Muhammad Abdul Noshairwan, Wajahat Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

ISBN: (纸本)0769528449

Structured knowledge is the most important component of semantic based information systems required to automate intelligent tasks which are normally performed by expert humans. The knowledge about a domain is typically structured in the form of Ontologies. An ontology organizes basic terms and the rules for combining these terms in the form that is machine-interpretable and machine-understandable. Therefore, defining an ontology should be considered an important and serious task with well-defined tools and techniques to verify and validate it. A considerable work is being done to define the processes to develop Ontologies for every phase of its life-cycle [1]. Automated tools to evaluate the contents of an ontology are a great help for large scale ontology developers. We formulated some ontologies to represent real life situations and left certain errors in those ontologies intentionally to see whether these tools would raise the alarm or not. To our surprise, there were some important situations where the alarm should have been raised, but we did not get any warning. In this paper, we report those situations and present algorithms to raise the alarm. We have surveyed the available literature with reference to these situations, and unfortunately could not found satisfactory answer. This paper also summarizes the survey. One of the most difficult situation to detect with automated tools is the incompleteness. This requires the intervention of the domain experts / ontology developers. We discovered that disjoint knowledge and exhaustive knowledge omissions are not being handled by existing tools to raise an alarm for the developers. Algorithms have been proposed to tackle these situations. These algorithms have been executed on a number of case studies. We found them working properly. © 2007 IEEE.

关键词： Ontology

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Terminal Mobility Services in the Middleware Environment

Terminal Mobility Services in the Middleware Environment

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ACS/IEEE International Conference on Computer Systems and Applications

作者： Syed Zubair Ahmad Mohammad Abdul Qadir Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan Center for Distributed and Semantic Computing Islamabad campus

Terminal Mobility is a much more common activity today then it was anticipated a few years back. Mobility itself is a complex phenomenon which is further complicated in a distributed application environment due to abstraction of cross-platform details and cross-realm handoffs. CORBA is a widely used middleware service used for remote method invocation in distributed applications. Vertical handoffs in cross-realm environment puts a serious constraint on effective resolution of resource names and hence CORBA utility in mobile heterogeneous environment. We propose a robust middleware architecture which takes into account multiple access services at link-layer performs optimization of connectivity services at middleware with the help of decision making support provided by application needs and network status. The proposed architecture promises resilient middleware services for terminal mobility.

关键词： Middleware distributed computing Mobile radio mobility management Mobile communication Application software Computer networks Resource management Robustness Computer architecture Telecommunication network reliability

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