S. Sivakumar

S. Sivakumar
Saint Mary's University | SMU · Department of Finance, Information Systems, and Management Science

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29
Publications
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386
Citations

Publications

Publications (29)
Conference Paper
The paper introduces two novel algorithms, one each for static and dynamic traffic types, to improve the availability of high priority connection requests over shared mesh optical networks. The proposed algorithms are a complementary study to the previous work. The paper also proposes a new metric, maximum path availability, by which the proposed a...
Conference Paper
The paper presents a dynamic provisioning mechanism through which service providers can exploit the unused allowable down time of the connections to serve the additional upcoming requests. The algorithm work based on the holding time of the connections and the failure arrival rate over the selected primary or backup paths. The proposed mechanism in...
Article
This chapter presents a multiple constraint optimization algorithm called routing decision system (RDS) that uses the concept of preference functions to address the problem of selecting paths in core networks that satisfy traffic-oriented QoS requirements while simultaneously satisfying network resource-oriented performance goals. The original cont...
Article
Network multimedia applications constitute a large part of Internet traffic and guaranteed delivery of such traffic is a challenge because of their sensitivity to delay, packet loss and higher bandwidth requirement. The need for guaranteed traffic delivery is exacerbated by the increasing delay experienced by traffic propagating through more than o...
Conference Paper
Full-text available
Clustered wireless sensor network models typically assume that a clear line-of-sight path separates the transmitter and receiver within a cluster; an accurate assumption for relatively short distances. For longer distances, and in environments that are obstructed, the log-distance path loss model agrees better with measurements. In this paper, comm...
Conference Paper
Extended network life is one of the fundamental objectives in the design of wireless sensor network systems. Clustering protocols help in achieving this objective in an efficient and scalable manner by organizing nodes into small hierarchical groups. In single hop clustering protocols, assumptions are made about direct communication from the cluste...
Conference Paper
Full-text available
Networking, communications and computing research employ state-of-the-art infrastructure and facilities to develop and test next generation Internet applications including electronic education and electronic health. With this focus, the Internetworking Program at Dalhousie University has established an Advanced Internetworking Laboratory (AIL) rese...
Conference Paper
This paper derives an algorithm for minimizing energy spent by a hierarchical wireless sensor network in transmitting data to a sink, referred to as a base station. The network model considered is a single-hop multi-level clustered network. We draw on results from stochastic geometry to analytically determine the optimum number of clusters at each...
Article
Full-text available
A Web-based remote interactive laboratory (RIL) developed to deliver Internetworking laboratory experience to geographically remote graduate students is presented in this paper. The onsite Internetworking program employs hands-on laboratories in a group setting that correlates with the constructivist and collaborative pedagogical approach. This pap...
Conference Paper
TCP is the widely used transport protocol across the Internet but it was originally designed for wired networks. In satellite networks, TCP encounters serious problems due to the physical properties of the wireless medium. The high delays in GEO networks and high variability of delay in LEO systems are the most significant factors affecting TCP per...
Conference Paper
Heuristic QoS algorithms under strict constraints perform poorly in terms of finding a path that is suitable for a user's QoS needs-the multiple constraint path problem (MCP). Exact QoS algorithms, on the other hand, guarantee that a path satisfying user needs would be found and offer a more realistic approach for solving the MCP problem in view of...
Conference Paper
Customer churn is a vexing problem in the telecom industry. Data mining techniques play an important role in churn prediction. However, most of these techniques can only provide a result that customers may churn or not, but seldom tell why they churn. Therefore even an accurate prediction result is of minimal use to telecom management, especially t...
Article
This paper compares the performance of face recognition systems based on principal component analysis (PCA), Gabor wavelets (GW) and discrete wavelet transform (DWT). The three techniques are implemented in the MATLAB programming environment, and their performance is investigated using frontal facial images from the FERET database. The images are p...
Conference Paper
The core of any quality of service (QoS) scheme is how to monitor and manage traffic flows that have guaranteed QoS. The two QoS approaches used in the literature are, IntServ (integrated service) (White, P.P., 1997) and DiffServ (differentiated service) (Blake, S. et al., 1998). IntServ uses the resource reservation protocol (RSVP) for signaling t...
Conference Paper
The problem of finding QoS paths involving several combinations of network metrics is NP-complete. This motivates the use of heuristic approaches for finding feasible QoS paths. Many constraint based routing algorithms find QoS paths by first pruning resources that do not satisfy the requirements of the traffic flow and then running a shortest path...
Conference Paper
Full-text available
The Faculty of Engineering at Dalhousie University, Halifax, Canada has been offering a Master's degree program in Internetworking since 1997. The program also provides comprehensive "hands-on" laboratory experience in configuring, maintaining, troubleshooting and simulating networks. The university intends to increase its student base through onli...
Conference Paper
With the growth of the Internet and intranets, and the use of multimedia applications, video and audio streams, QoS (quality of service) technology has become more relevant and important Yoram Bernet (2000). The next generation Internet protocol (IPv6) provides more features than IPv4 such as more address space and new fields that can be used to en...
Conference Paper
With the proliferation of alternate power sources such as fuel cells and photovoltaic systems in the distributed power system architecture it is important to design inverters to support seamless bi-directional power flow between the inverter and the grid. For this the inverter should work in voltage control mode in stand alone operation; current co...
Conference Paper
End-to-end quality of service (QoS) is defined as the capability of a network to provide better service to selected network traffic over various network technologies such as IP, ATM or frame relay networks. Recently users are beginning to combine real-time applications such as voice and video, which have a limited tolerance for network latency and...
Conference Paper
This paper presents the optimized conditions for stepped wave inverters in order to minimize the total harmonic distortion present in the output waveform. It is shown that one- and two-level waveforms do not have sufficient degrees of freedom to meet harmonic standards like the IEEE 519. However three-level waveforms can be constructed, which meet...
Conference Paper
This paper addresses the dynamic modelling and control design of interleaved parallel DC-DC buck (or buck derived) converters with circuit parameter imbalance. It is shown that the imbalance in the filter inductance of the individual converter stages has a great impact on the differential mode stability of the overall system. Control strategies to...
Conference Paper
The objective of this paper is to recognize speech based on speech prediction techniques using a discrete time recurrent neural network (DTRNN) with a block diagonal feedback weight matrix called the block diagonal recurrent neural network (BDRNN). The ability of this network has been investigated for the TIMIT isolated digits spoken by a represent...
Article
This paper deals with a discrete-time recurrent neural network (DTRNN) with a block-diagonal feedback weight matrix, called the block-diagonal recurrent neural network (BDRNN), that allows a simplified approach to online training and to address network and training stability issues. The structure of the BDRNN is exploited to modify the conventional...
Conference Paper
This paper deals with a discrete time recurrent neural network (DTRNN) with a block-diagonal feedback weight matrix, called the block-diagonal recurrent neural network (BDRNN), that allows a simplified approach to online trajectory learning. The BDRNN is a sparse but structured architecture in which the feedback connections are restricted to betwee...
Conference Paper
This paper considers the construction method for the block-diagonal recurrent neural network (BDRNN) that is capable of modelling plants with complex eigenvalues. If nonlinear dynamics can be decoupled into a dominant dynamic and several less dominant dynamics, then it is feasible to employ blocks of BDRNNs, one each, to automatically learn each of...
Conference Paper
The authors deal with increasing the amount of temporal information that can be extracted by a time delay neural network in speech recognition problems. In addition to input time windows, frequency windows are considered for connection to the hidden units. Frequency windows are included to extract more information, such as the change in the energy...
Article
This paper proposes an ANN architecture for consonant recognition in continuous speech that utilizes cues in the neighbouring vowels, in addition to cues in the consonants themselves. The additional cues are due to coarticulatory effects and enhance the recognition capability, especially for stop consonants which have weak speech cues. Simulation r...

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