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Disjoint-knowledge analysis and preservation in ontology merging process

Disjoint-knowledge analysis and preservation in ontology mer...

引用

International Conference on Software Engineering Advances

作者： Fahad, Muhammad Moalla, Nejib Bouras, Abdelaziz Qadir, Muhammad Abdul Farukh, Muhammad University of Lyon2 CERRAL IUT-Lumiere Lyon II Bron France Center for Distributed and Semantic Computing M.A.J.U. Islamabad Pakistan

ISBN: (纸本)9780769541440

Ontology mapping and merging systems play a vital role that aim at promoting automatic interoperability among different heterogeneous systems, agents, web services or groups in open environments such as semantic Web. These systems help ontologists to resolve different types of conflicts among local ontologies to produce global merged ontology. This paper provides three contributions to the study and design of ontology merging systems that provides complete, consistent and coherent merged global ontology. First, we analyze that one of the important merge requirements is ignored yet by state-of-the-art ontology mapping and merging systems, i.e., Disjoint-knowledge Preservation between concepts. Second, we introduce another type of semantic conflict, which needs attention for consistent and coherent merged ontology, i.e., Alignment Conflict among disjoint relations. Third, we present an overview of our semantic-based ontology merger, DKP-OM, as a solution for the generation of global merged ontology that is consistent, coherent and complete with respect to local ontologies. We conclude that disjoint knowledge analysis for ontology merging is very much helpful for the detection of inconsistent initial mappings that originate from concept name or instance matching strategies, reduce search space for concept matching, and promote consistent computation by exploiting reliable logical inference on facts by axiomatization. © 2010 IEEE.

关键词： Ontology

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Evaluation of extended error taxonomy for OWL2

Evaluation of extended error taxonomy for OWL2

引用

International Conference on Information and Emerging Technologies, ICIET

作者： Naseer Ahmed Sajid Muhammad Abdul Qadir Tariq Ali Center for Distributed and Semantic Computing Department of Computer Science Mohammad Ali Jinnah University Islamabad Pakistan

Ontology Evaluation is one of the most critical phases in ontology engineering. Applications depending upon ontology can have serious and appalling problems if ontology itself is infected with errors. Therefore, ontology should be consistent, complete and errors free. An error taxonomy using OWL constructs and axioms was developed to overcome the possibility of occurring errors in ontology. Recently, some new features have been proposed in OWL2 specification to overcome the limitation of expressive power of OWL. In this paper we evaluate the extended error taxonomy of OWL with the new features of OWL2. We also evaluate that while using OWL2 features, occurrence of possibility of new types of errors get reduced or not. On the basis of different examples for each error, we conclude that the error taxonomy is also valid for OWL2. This is because of the fact that every OWL ontology is a valid OWL2 ontology and every OWL2 ontology (excluding new features) is also a valid OWL ontology. The zero level circulatory errors can also be removed if we use the reflexive property and self restriction (local reflexive) property of OWL2. Otherwise, we have to generate a warning omission for zero level circulatory error.

关键词： Ontologies Taxonomy Redundancy OWL semantics Animals Vocabulary

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Disjoint-Knowledge Analysis and Preservation in Ontology Merging Process

Disjoint-Knowledge Analysis and Preservation in Ontology Mer...

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International Conference on Software Engineering Advances (ICSEA)

作者： Muhammad Fahad Nejib Moalla Abdelaziz Bouras Muhammad Abdul Qadir Muhammad Farukh CERRAL / IUT University of Lyon Bron France Center for distributed and Semantic Computing M. A. J. University Islamabad Pakistan

关键词： Ontologies Merging semantics OWL Pragmatics Redundancy Cognition

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An Opportunistic Multi-server Scheduling Approach for Service Guarantees through Mobile Routers

An Opportunistic Multi-server Scheduling Approach for Servic...

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International Conference on Advances in Future Internet

作者： Syed Zubair Ahmad Muhammad Abdul Qadir Abdelaziz Bouras Center for Distributed and Semantic Computing (CDSC) Mohammad Ali Jinnah University Islamabad Pakistan Research and Research-action Lumiere (CERRAL) IUT-Lumiere University Lumiere Lyon 2 Lyon France

ISBN: (纸本)9781424475285

In this paper, we have presented an opportunistic multi-server scheduling scheme that distributes traffic on multiple wireless interfaces of a mobile router to improve service guarantees for competing flows during mobility. The proposed adaptive, scalable, multi-server (ASM) scheduling scheme extends guaranteed-rate(GR) service model to ensure bounded service delays for each packet of flows in accordance with their committed rates. The major challenges handled through ASM scheduling include the unification of mutable heterogeneous wireless links into a single virtual channel with higher capacity. This approach enhances service guarantees without resource reservation on individual wireless links for diverse traffic sources. Hence, the transmission deadlines for multiple flows are maintained through transparently hiding disconnections during mobility. The simulation results of proposed scheme show higher degree of reliability and scalability of service provisioning during mobility.

关键词： Servers Delay Schedules Scheduling Wireless communication Availability Mobile communication

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Constructing experts profiles from Linked Open Data

Constructing experts profiles from Linked Open Data

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International Conference on Emerging Technologies, ICET

作者： Atif Latif Muhammad Tanvir Afzal Klaus Tochtermann Knowledge Management Institute Graz University of Technology Graz Austria Centre for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan Knowledge Management Institute Know Center Graz University of Technology Graz Austria

Identification and assignment of (potential) experts to subject field is an important task in various settings and environments. In scientific domain, the identification of experts is normally based on number of factors like: number of publications, citation record, and experience etc. However, the discovered experts cannot be assigned reviewing duties immediately. One also need further information about expert like the country, university, service record, contributions, honors, and name of conferences/journals where the discovered expert is already serving as editor/reviewer. To some extent, this information can be found from search engines using heuristics, by applying Natural Language Processing, and Machine Learning techniques. However, the emergence of many semantically rich and structured datasets from Linked Open Data movement (LOD) can facilitate in more controlled search and fruitful results. This paper employs an automatic technique to find the required information about experts using LOD dataset. The expert profile is discovered, aggregated, clustered, structured, and visualized to the administration of peer-review system. The system has been implemented for an electronic journal such as Journal of Universal Computer Science (***). The proposed system facilitates *** administration to find potential reviewers for scientific papers to assign reviewing duties and to call new editors for computer science topics.

关键词： Book reviews semantics Computer science Data mining Spirals System analysis and design Search engines

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Detection of crashed objects in eACID and its comparision with other techniques

Detection of crashed objects in eACID and its comparision wi...

引用

2009 IEEE 13th International Multitopic Conference, INMIC 2009

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

ISBN: (纸本)9781424448722

Failure detectors are one of the key components of fault tolerant distributed systems as it is very important to determine the suspected/crashed object and take recovery steps to keep the system going. The main objective of the fault monitoring activity is to quickly and correctly identify the faults. A fault monitoring system which is quick to declare faults increases the chances of false alarms, i.e., declaration of a fault which is actually not a fault. Therefore, an ideal fault monitoring system needs to be as quick as possible in identification of faults without increasing the false alarms. One of the major responsibilities of the monitor is to adapt these intervals according to the dynamic network and system conditions, and set them close to the actual delays in the system. The adaptation of the delays, timeout and monitoring intervals, must not fluctuate with large amplitudes around the actual delays. Otherwise, the number of false alarms would increase or the identification of faults will be delayed. Our algorithm with the name of eACID (enhanced Adaptive Convergent Intelligent fault monitoring in distributed systems), when compared with the best known algorithm, ADAPTATION [Sotama et al.], yielded 16% less false timeouts and 9% more utilization of responses. eACID adapts the timeout on the previous history which gives us a fair idea about the work load and we use it to our advantage. Our scheme does not take decisions on transient behaviors of the system, moreover it has a threshold which is set after having intimate knowledge of past network behavior. These threshold depend on consecutive timeouts occurred/ If this threshold is crossed, it is declared dead. ©2009 IEEE.

关键词： Monitoring

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OntRel: An optimized relational structure for storage of dynamic OWL-DL ontologies

OntRel: An optimized relational structure for storage of dyn...

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2009 IEEE 13th International Multitopic Conference, INMIC 2009

作者： Khalid, Adnan Shah, Syed Adnan Hussain Qadir, Muhammad Abdul Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan

ISBN: (纸本)9781424448722

Ontology is one of the most important components of semantic based information systems which provides context to the document. Ontology enables us to define relationship between different terminologies from diverse domains. To interpret this information and perform reasoning we require to store Ontologies in a way that retrieval becomes easy. Ontologies are defined using OWL (Web Ontology Language) which is based on XML. All the OWL documents are stored in the form of specialized XML files. With the increase in the semantic websites number of Ontologies describing different domains also grow and with their growth there comes a problem of storing these Ontologies. With the passage of time it has been established that RDBMS (Relational Database Management Systems) is the most efficient and reliable Data Structure in terms of storage and retrieval. To store OWL documents in RDBMS multiple techniques have been proposed, but they still lack the advantages of RDBMS. All the databases in RDBMS are closed in nature, but OWL documents are inherently dynamic and semi-structured. So, there is a need to preserve the dynamic OWL documents in the Relational structure in such an way that no data or relationship is lost and advantages of RDBMS are also gained. This paper briefly presents the survey of existing ontologies with comparative analysis on the basis of Load Time and Query Performance. Secondly, this paper makes a contribution by proposing a rule based approach to improve the downside of earlier techniques. ©2009 IEEE.

关键词： Ontology

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引用

2009 2nd International Conference on Computer, Control and Communication, IC4 2009

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

ISBN: (纸本)9781424433148

One of the core tasks of mapping and merging of multiple ontologies is to produce accurate, consistent and coherent merged global ontology that promotes interoperability among heterogeneous multi-vendors semantic-based systems. Current systems for ontology mapping and merging are very restricted in terms of resolving mismatches or proposing accurate matches with no or minimum human intervention. The suggestions made by these systems do not consider all information available in the semantic knowledge of the ontologies. We developed a semantic based ontology merging system, DKP-OM that employs almost all the semantics provided in the ontologies. This paper discusses the similarity computation factors considered by DKP-OM for providing complete, consistent and coherent merged ontology. These factors find the correspondences between the concepts of ontologies and check the consistency of initial mappings found. The concept of validation during the initial stages of ontology mapping not only distinguishes our system from the existing ones' but also reduces the users' dependability for validating the consistency of the generated mappings.

关键词： Mapping

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Service optimization of in-elastic flows stripped over multiple asymmetric mobile channels

Service optimization of in-elastic flows stripped over multi...

引用

2009 IEEE 13th International Multitopic Conference, INMIC 2009

作者： Ahmad, Syed Zubair Qadir, Muhammad Abdul Akbar, Muhammad Saeed Center of Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Campus Islamabad Pakistan

ISBN: (纸本)9781424448722

In this paper, we present a stateless multi-server guaranteed rate scheduling service model that utilizes multiple, asymmetric wireless channels to maximize service guarantees for in-elastic flows. One of the major consequences of multichannel flow forwarding is the increased intra-path and interpath end-to-end delay variations between successive packets of a stream. These variations cause problems in achieving desired service levels due to increased reorder overhead, higher packet drop-rate, and higher buffer maintenance overhead. We have aggregated the capacity of available wireless channels through a link monitoring function (LMF) and has formulated a multiserver scheduling model that ensures tight delay-bounds and lower service latency to minimize inter-path delay variations and out-of-sequence arrival. The simulation results show consistently higher performance metrics of the scheme w.r.t. end-to-end delay variations, in-order arrival, and service latency that enable reliable, scalable, guaranteed rate service during mobility. ©2009 IEEE.

关键词： Quality of service

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OntRel: An Ontology Indexer to Store OWL-DL Ontologies and Its Instances

OntRel: An Ontology Indexer to Store OWL-DL Ontologies and I...

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International Conference of Soft computing and Pattern Recognition (SOCPAR)

作者： Adnan Khalid Syed Adnan Hussain Shah Muhammad Abdul Qadir Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad Pakistan Center for Distributed and Semantic Computing Mohammad Ali Jinnah University Islamabad

Ontology is one of the most important components of a semantic based information system which provides context to the document. Ontology enables us to capture the semantics of documents. To interpret information and perform reasoning we require storing ontologies in a way that is correct, consistent, scalable and efficient to retrieve. RDBMS (relational database management systems) is the most efficient and reliable data structure in terms of storage and retrieval. One of the ways is to store ontologies in RDBMS. OWL is used to represent ontologies. To store OWL documents in RDBMS multiple techniques have been proposed, but they either deal with single ontology or they do not store complete semantics expressed in OWL ontologies which compromise the correct retrieval of the data. Some of the techniques are not really scalable, as the ontology is dynamic and extensible where as the RDBMS schema is not dynamically extensible. So, there is a need to preserve the dynamic OWL documents in the Relational structure in such a way that no data or relationship is lost and advantages of RDBMS are also gained. This paper addresses the issue of storing multiple OWL ontologies in an RDBMS in a way that is correct, consistent, scalable and efficient to retrieve. A relational schema, with the name of OntRel, has been proposed along with a set of rules to populate database from OWL documents. OntRel has been implemented and tested and available as on the web for open use. Finally, we have compared the Load time, Query performance and completeness of OntRel with other indexing techniques using Lehigh University Benchmark (LUBM) and University Ontology Benchmark (UOBM).

关键词： Ontologies OWL Information retrieval Search engines Management information systems semantic Web distributed computing Relational databases Benchmark testing Crawlers

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