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International Conference on Network-Based Information systems (NBIS)

作者： Nawsher Khan A. Noraziah Tutut Herawan Elrasheed Ismail Zakira Inayat Faculty of Computer Systems and Software Engineering University Malaysia Pahang Kuantan Pahang Malaysia

Reliability, efficiency (in term of time consumption) and effectiveness in resources utilization are the desired quality attributes of Cloud Scheduling System, the main purpose of which is to execute jobs optimally, i.e. with minimum average waiting, turnaround and response time. Replication provides improved availability, decreased bandwidth use, increased fault tolerance, and improved scalability. To speed up access, file can be replicated so a user can access a nearby replica. In this paper, we propose architecture to convert Globally One Cloud to Locally Many Clouds. By combining replication and scheduling, this architecture will improve efficiency, accessibility and reliability. In the case of failure of one sub cloud or one cloud service, clients can start using another cloud under "failover" techniques. As a result, no one cloud service will go down.

关键词： Cloud computing computer architecture Mathematical model Bandwidth Reliability Servers Scheduling

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CBARS: Cluster Based Classification for Activity Recognition systems

CBARS: Cluster Based Classification for Activity Recognition...

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作者： Abdallah, Zahraa Said Gaber, Mohamed Medhat Srinivasan, Bala Krishnaswamy, Shonali Centre for Distributed Systems and Software Engineering Monash University Melbourne Australia School of Computing University of Portsmouth Portsmouth Hampshire PO1 3HE United Kingdom Singapore Faculty of Computer and Information Science Ain Shams University Cairo Egypt

ISBN: (纸本)9783642353253

Activity recognition focuses on inferring current user activities by leveraging sensory data available on today's sensor rich environment. Supervised learning has been applied pervasively for activity recognition. Typical activity recognition techniques process sensory data based on point-by-point approaches. In this paper, we propose a novel Cluster Based Classification for Activity Recognition systems, CBARS. The novel approach processes activities as clusters to build a robust classification framework. CBARS integrates supervised, unsupervised and active learning and applies hybrid similarity measures technique for recognising activities. Extensive experimental results using real activity recognition dataset have evidenced that our new approach shows improved performance over other existing state-of-the-art learning methods. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Pattern recognition

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A Case Analysis of IEEE 802.11 CSMA/CA Protocol via Sequence Diagrams

A Case Analysis of IEEE 802.11 CSMA/CA Protocol via Sequence...

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International Conference on Computational Intelligence, Modelling and Simulation (CSSIM)

作者： Mohamed Ariff Ameedeen Behzad Bordbar Faculty of Computer Systems & Software Engineering Universiti Malaysia Pahang Pahang Malaysia School of Computer Science University of Birmingham Birmingham United Kingdom

Unified Modelling Language (UML) has been conferred as the de facto standard in modeling by majority in the software system development community. Among the various types of diagrams that exist under the umbrella of UML is Sequence Diagram. Sequence Diagrams are capable of modeling interactional behaviours as well as dynamic happenings in a system, and as such are generally used in the modeling of complex software systems. However in this paper, Sequence Diagrams are used in the modeling of the IEEE 802.11 Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol. The Sequence Diagram representing this protocol will then be used for formal, mathematical analysis by first transforming the Sequence Diagram through the MDA model transformation tool called SD2PN, and performing analysis such as liveness analysis, boundedness analysis and reach ability analysis of the resulting Petri Net.

关键词： Unified modeling language Protocols Petri nets Multiaccess communication IEEE 802.11 Standards Mathematical model Computational modeling

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Evaluation of dynamic conflict avoidance algorithm

Evaluation of dynamic conflict avoidance algorithm

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International Conference on computer Sciences and Convergence Information Technology (ICCIT)

作者： Abdehamid Abdelhadi Mansor Wan M. N. Wan Kadir Toni Anwar Hidayah Elias Department of Computer Science Faculty of Mathematical Sciences University of Khartoum Khartoum Sudan Department of Software Engineering Faculty of Computer Science & Information Systems Universiti Teknologi Malaysia Johor Malaysia

ISBN: (纸本)9781467308946

Dynamic system management may involve interaction between independent decision-making components which can lead to conflicts. Policy-based Managers Coordination (PobMC) was proposed as an adaptive framework that may handle such conflicts. In PobMC, policies are used to adapt the system behavior, coordinate managers' tasks and allow us to decouple the adaptation concerns from the application code. Thus, it is required to ensure whether the governing policies are enforced correctly. In this paper we check and evaluate the dynamic conflict avoidance algorithm proposed in our previous works. Policy combination algorithms (PACs) concepts are used in the analysis and the evaluation to avoid policy conflicts and to reach a unique decision.

关键词： Dynamic conflict detection Policy-conflict Policy-based system management Adaptive software Conflict (Psychology) Policies System management Avoidance manager

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Threshold concepts and threshold skills in computing 12

Threshold concepts and threshold skills in computing

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9th Annual International Conference on International Computing Education Research, ICER 2012

作者： Sanders, Kate Boustedt, Jonas Eckerdal, Anna Mccartney, Robert Moström, Jan Erik Thomas, Lynda Zander, Carol Mathematics and Computer Science Department Rhode Island College Providence RI United States Faculty of Engineering and Sustainable Development University of Gävle Gävle Sweden Department of Information Technology Uppsala University Uppsala Sweden Department of Computer Science and Engineering University of Connecticut Storrs CT United States Department of Computing Science Umeå University 901 87 Umeå Sweden Department of Computer Science Aberystwyth University Aberystwyth United Kingdom Computing and Software Systems University of Washington Bothell WA United States

ISBN: (纸本)9781450316040

Threshold concepts can be used to both organize disciplinary knowledge and explain why students have difficulties at certain points in the curriculum. Threshold concepts transform a student's view of the discipline;before being learned, they can block a student's progress. In this paper, we propose that in computing, skills, in addition to concepts, can sometimes be thresholds. Some students report finding skills more difficult than concepts. We discuss some computing skills that may be thresholds and compare threshold skills and threshold concepts. Copyright 2012 ACM.

关键词： Students

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Self-directed learning: Stories from industry 12

Self-directed learning: Stories from industry

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12th Koli Calling International Conference on Computing Education Research, Koli Calling 2012

作者： Zander, Carol Boustedt, Jonas Eckerdal, Anna Mccartney, Robert Moström, Jan Erik Sanders, Kate Thomas, Lynda Computing and Software Systems University of Washington Bothell Bothell WA United States Faculty of Engineering and Sustainable Development University of Gävle Gävle Sweden Department of InformationTechnology Uppsala University Uppsala Sweden Department of Computer Science and Engineering University of Connecticut Storrs CT United States Department of Computing Science Umeå University 901 87 Umeå Sweden Mathematics and Computer Science Department Rhode Island College Providence RI United States Department of Computer Science Aberystwyth University Aberystwyth United Kingdom

ISBN: (纸本)9781450317955

We report preliminary results from an ongoing investigation of how computing professionals perceive and value selfdirected learning, based on a qualitative analysis of interviews with ten computing professionals. The professionals expect that future colleagues will have a well-developed ability to learn on their own. They indicate that professionals use a range of resources, strategies, and collaborators to help them learn. They find their work-related self-directed learning enjoyable, expressing a sense of confidence and pride;yet they often also find it to be a stressful never-ending process. Copyright 2012 ACM.

关键词： informal learning self-directed learning industry perspective

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Developmental Issues of web-based decision support system

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Journal of Applied Sciences 2012年第19期12卷 2059-2064页

作者： Ahmad, Fadhilah Noraziah, A. Safei, Suhailan Abidin, Azrul Amri Bharun Ahmed Abdalla, N. Mohamad, Aznida Hayati Zakaria Faculty of Informatics University Sultan Zainal Abidin UniSZA 21300 Gong Badak Campus Kuala Terengganu Malaysia Faculty of Computer Systems and Software Engineering University Malaysia Pahang Gambang 26300 Malaysia Faculty of Electrical and Electronic Engineering University Malaysia Pahang Gambang 26300 Malaysia

Decision Support systems (DSS) are computer programs that aid users in a problem solving or decision-making environment. DSS contains decision making information and other related data that may be of interest to unscrupulous competitors and stakeholders. Therefore, a DSS that is developed for web-based environment has to be secured from unauthorized access or malicious attacks. This study describes a framework of a secured DSS suitable to support decision making activities. Security issues are discussed from various perspectives with the proposed mechanisms to ensure a secured DSS implementation in distributed environment. Issues in web-based application development that include data growth, system performance and appearance compatibility are also presented together with their proposed solutions. Considering security and development issues could contribute towards successful implementation in the decision making process. © 2012 Asian Network for Scientific Information.

关键词： Locks (fasteners)

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Architecture and design flow for a debug event distribution interconnect

Architecture and design flow for a debug event distribution ...

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IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： Arnaldo Azevedo Bart Vermeulen Kees Goossens Department of Software and Computer Technology Delft University of Technology Delft Netherlands NXP Semiconductors Eindhoven Netherlands Electronic Systems Group Faculty of Electrical Engineering Eindhovan University of Technology Eindhoven Netherlands

In this paper, we describe and analyze the architecture of the proposed Debug Event Distribution Interconnect (EDI). The EDI transmits debug events, which are 1-bit signals, between debug entities in different areas of the Network-on-Chip based Multi-Processor System-on-Chip. The EDI replicates the NoC topology with an EDI node instantiated for each underlying NoC data module. Contention in the EDI node is handled by replicating the EDI in layers. The EDI generation is automatic, and uses as input the cross-triggering patterns that are not required to follow the communication patterns in the NoC. The generation and routing tool is also presented in this paper. The EDI is evaluated with four different implementations varying complexity and handling of contention. The area of a single EDI Layer is around 0.9% of the area occupied by the tested NoCs, using the lower area implementation. These results show that the proposed implementation of the EDI incurs low cost on the overall system.

关键词： Monitoring Topology Routing Registers Complexity theory IP networks

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A novel binary vote assignment grid quorum algorithm for distributed database fragmentation

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International Conference on Digital Enterprise and Information systems, DEIS 2011

作者： Che Fauzi, Ainul Azila Noraziah, Ahmad Mohd Zin, Noriyani Faculty of Computer Systems and Software Engineering University Malaysia Pahang Pahang Malaysia

ISBN: (纸本)9783642226021

Data replication is one of the mechanisms in data grid architecture since it improves data access and reliability. Therefore, the storage, availability, and consistency are important issues to be addressed in order to allow distributed users efficiently and safely access data from many different sites. This paper propose a new algorithm namely Binary Vote Assignment on Grid Quorum (BVAGQ) in order to handle data replication and transaction management. We address how to build reliable system by using the proposed BVAGQ algorithm for distributed database fragmentation. The result show that managing replication and transaction through proposed BVAGQ able to prepare data consistency. © 2011 Springer-Verlag.

关键词： Digital storage

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Generation of discrete frequency and wavelength for secured computer networks system using integrated ring resonators

Generation of discrete frequency and wavelength for secured ...

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International Conference on computer and Communication engineering, ICCCE

作者： I. S. Amiri k. Sarkhanlou A. Nikoukar A. Shahidinejad J. Ali P. P. Yupapin Institute of Advanced Photonics Science Nanotechnology Research Alliance Universiti Teknologi Malaysia (UTM) Johor Bahru Malaysia Department of Computer Software Engineering Comprehensive University of Applied and Practical Sciences Ardebil Iran Faculty of Computer Science & Information Systems (FCSIS) Universiti Teknologi Malaysia (UTM) Johor Bahru Malaysia Advanced Research Center for Photonics Faculty of Science King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

In this study, a system of discrete optical pulse generation via a series of microring resonator (MRR) is presented. Chaotic signals can be generated by an optical soliton or a Gaussian pulse within a MRR system. Large bandwidth signals of optical soliton are generated by input pulse propagating within the MRRs, which can be used to form continuous wavelength or frequency with large tunable channel capacity. Therefore, distinguished discrete wavelength or frequency pulses can be generated by using localized spatial pulses via a networks communication system. Selected discrete pulses are more suitable to generate high-secured quantum codes because of the large free spectral range (FSR). Quantum codes can be generated by using a polarization control unit and a beam splitter, incorporating to the MRRs. In this work, frequency band of 10.7 MHz and 16 MHz and wavelengths of 206.9 nm, 1448 nm, 2169 nm and 2489 nm are localized and obtained which can be used for quantum codes generation applicable for secured networks communication.

关键词： Optical solitons Optical filters Optical pulses Optical ring resonators Nonlinear optics Optical polarization

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