Author

Shamala Subramaniam

Universiti Putra Malaysia, Malaysia

9 articles in our journals

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Research ArticleOpen accessAN EVENT DRIVEN SIMULATION FOR ADAPTIVE GENTLE RANDOM EARLY DETECTION (AGRED) ALGORITHMOmid Seifaddini, Azizol Abdullah, Shamala SubramaniamSimulations are used to find optimum answers for problems in wide areas. Active queue management algorithms such as RED, GRED, typically use simulators like ns2 which is an open source simulator or OPNET, OMNET which are commercial simulators. However, beside the benefits of using simulators like having defined modules, parameters. There are problems such as complexity, large integrated components and … …Journal of Computer Science, Vol. 10, Issue 10 · 13 May 2014 · 7,009 accessesView PDF Cite

Research ArticleOpen accessPerformances of Partition Utility Accrual Real Time Scheduling AlgorithmIdawaty Ahmad, Shamala Subramaniam, Mohamed Othman, Zuriati ZulkarnainProblem statement: This study proposed a TUF/UA real time scheduling algorithm known as Partition Preemptive Utility Accrual Scheduling (PUAS) also known as PPUAS algorithm. This algorithm addressed the overloaded problem that was identified in a uniprocessor scheduling environment and the necessity to design the scheduling algorithm in a multiprocessor environment. Approach: The PUAS algorithm was enhanced into the partitioned multiprocessor … …Journal of Computer Science, Vol. 8, Issue 8 · 12 Jul 2012 · 7,009 accessesView PDF Cite

Research ArticleOpen accessA Discrete Event Simulation Framework for Utility Accrual Scheduling Algorithm in Uniprocessor EnvironmentIdawaty Ahmad, Shamala Subramaniam, Mohamed Othman, Zuriati ZulkarnainProblem statement: The heterogeneity in the choice of simulation platforms for real time scheduling stands behind the difficulty of developing a common simulation environment. A Discrete Event Simulation (DES) for a real time scheduling domain encompassing event definition, time advancing mechanism and scheduler has yet to be developed. Approach: The study focused on the proposed and the development of an … …Journal of Computer Science, Vol. 7, Issue 8 · 14 Jul 2011 · 7,224 accessesView PDF Cite

Research ArticleOpen accessCohesive Token Passing Algorithm Utilizing Software AgentsA. Fua’ad Abdulrazzak, Shamala SubramaniamProblem statement: The communications domain has utilized the implementation of protocols for a wide spectrum of applications. This encompasses Medium Access Control (MAC) protocols. MAC protocols have been extensively researched from several angles. This encompasses the implementation in the area of Wave Division Multiplexing (WDM) networks and Mobile Adhoc Networks (MANET). The relevance of intelligence in sustaining the pre-requisites for … …Journal of Computer Science, Vol. 6, Issue 3 · 31 Mar 2010 · 7,111 accessesView PDF Cite

Research ArticleOpen accessExperimental Evaluation of Bottleneck Link Utilization with New-Additive Increase Multiplicative Decrease Congestion Avoidance and Control AlgorithmHayder Natiq Jasem, Zuriati Ahmad Zukarnain, Mohamed Othman, Shamala SubramaniamProblem statement: As the Internet becomes increasingly heterogeneous, the issue of congestion control becomes ever more important. And the link utilization is one of the important things in term of congestion avoidance and control mechanisms. And we can define the utilization as simply the throughput divided by the access rate. And also all the developments for the congestion control and … …Journal of Computer Science, Vol. 5, Issue 12 · 31 Dec 2009 · 7,133 accessesView PDF Cite

Research ArticleOpen accessLoad Allocation Model for Scheduling Divisible Data Grid ApplicationsMonir Abdullah, Mohamed Othman, Hamidah Ibrahim, Shamala SubramaniamProblem statement: In many data grid applications, data can be decomposed into multiple independent sub-datasets and distributed for parallel execution and analysis. Approach: This property had been successfully employed by using Divisible Load Theory (DLT), which had been proved as a powerful tool for modeling divisible load problems in data-intensive grid. Results: There were some scheduling models had been studied … …Journal of Computer Science, Vol. 5, Issue 10 · 31 Oct 2009 · 6,900 accessesView PDF Cite

Research ArticleOpen accessClosed form Solution for Scheduling Arbitrarily Divisible Load Model in Data Grid Applications: Multiple SourcesMonir Abdullah, Mohamed Othman, Hamidah Ibrahim, Shamala SubramaniamScheduling an application in data grid was significantly complex and very challenging because of its heterogeneous in nature of the grid system. When the Divisible Load Theory (DLT) model had emerged as a powerful model for modeling data-intensive grid problem, Task Data Present (TDP) model was proposed based on it. This study presented a new Adaptive TDP (ATDP) for scheduling … …American Journal of Applied Sciences, Vol. 6, Issue 4 · 30 Apr 2009 · 8,433 accessesView PDF Cite

Research ArticleOpen accessEmpirical Analysis of Virtual Carrier Sense Flooding Attacks Over Wireless Local Area NetworkMina Malekzadeh, Abdul Azim Abdul Ghani, Jalil Desa, Shamala SubramaniamProblem statement: Wireless Local Areas (WLANs) are subject to different types of vulnerabilities. Denial of Service (DoS) attack is the most current challenging issue on the WLANs. The objectives of the study were to (i) Provide an empirical analysis to conduct a series of wireless virtual carrier sense DoS attacks using wireless control frames vulnerabilities, (ii) Design a testbed to … …Journal of Computer Science, Vol. 5, Issue 3 · 31 Mar 2009 · 7,650 accessesView PDF Cite

Research ArticleOpen accessIncorporating Multiple Sources into AMTree ProtocolAli M. Al-Sharafi, Mohamed Othman, Md. N. Sulaiman, Shamala SubramaniamAMTree protocol is an active network based protocol that makes sending packets to receivers-after source migration-an efficient process. AMTree protocol was designed and tested for one mobile source sending to the multicast group. In this research we introduce a method that allows more than one mobile source to send to the multicast session. The results show that end-to-end latencies are … …Journal of Computer Science, Vol. 4, Issue 1 · 31 Jan 2008 · 6,870 accessesView PDF Cite