Deborah Ebem

University of Nigeria, Nsukka, Computer Science, Faculty Member

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Bill Warters

Wayne State University

George Nicholas

Simon Fraser University

Adam Gaudry

University of Alberta

Ashraf M. Salama

Northumbria University

David Seamon

Kansas State University

Renee Spencer

Boston University

Ursula Kilkelly

University College Cork

Dr. Sandeep Jagdale

Solapur university

Viacheslav Kuleshov

Stockholm University

Jesus Granados Sanchez

Universitat de Girona

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Papers by Deborah Ebem

Masking Release for Igbo and English

by Deborah Ebem, Louis Braida, and Joseph Desloge

African journal of computing and ICT, 2013

In this research, we explored the effect of noise interruption rate on speech intelligibility. Sp... more In this research, we explored the effect of noise interruption rate on speech intelligibility. Specifically, we used the Hearing In Noise Test (HINT) procedure with the original HINT stimuli (English) and Igbo stimuli to assess speech reception ability in interrupted noise. For a given noise level, the HINT test provides an estimate of the signal-to-noise ratio (SNR) required for 50%-correct speech intelligibility. The SNR for 50%-correct intelligibility changes depending upon the interruption rate of the noise. This phenomenon (called Masking Release) has been studied extensively in English but not for Igbo - which is an African tonal language spoken predominantly in South Eastern Nigeria. This experiment explored and compared the phenomenon of Masking Release for (i) native English speakers listening to English, (ii) native Igbo speakers listening to English, and (iii) native Igbo speakers listening to Igbo. Since Igbo is a tonal language and English is a non-tonal language, this ...

Validating Perceptual Objective Listening Quality Assessment Methods on the tonal Language Igbo

In recent years a great deal of effort has been expended to develop methods that determine the qu... more In recent years a great deal of effort has been expended to develop methods that determine the quality of speech through the use of comparative algorithms. These methods are designed to calculate an index value of quality that correlates to a mean opinion score given by human subjects in evaluation sessions. In this work, we validate PESQ (ITU-T Recommendation P. 862) and the TNO proposal (called PSQM2010) on the Perceptual Objective Listening Quality Assessment (POLQA) benchmark, which is the new ITU-T ...

The Impact of Tone Language and Non-Native Language Listening on Measuring Speech Quality

Models that represent objective speech quality should include the influence of the cultural backg... more

Evaluating the Performance of Heterogeneous Distributed Memory Parallel Computer System Using Recursive Models

2011 Second International Conference on Intelligent Systems, Modelling and Simulation, 2011

ABSTRACT In a heterogeneous distributed memory parallel computer system, each of the processors h... more ABSTRACT In a heterogeneous distributed memory parallel computer system, each of the processors has its own memory. Describing the system using queuing network, each of the processors has its own ready queue. Since the system has many I/O queues and I/O processors, therefore, the various processors with their various ready queues and the various I/O processors and their various I/O queues form the queuing network of such a system. Using a round robin scheduling algorithm for the processor queues, we aim at evaluating the performance of the system from the time jobs arrive into the system to the time jobs depart from the system. This paper uses recursive models to evaluate the performance of the whole queuing network of a heterogeneous distributed memory parallel computer system.

Performance of Heterogeneous Parallel Computer System with Distributed Memory Using Analytic and Simulation Techniques

2011 Third International Conference on Computational Intelligence, Communication Systems and Networks, 2011

ABSTRACT A heterogeneous parallel computer system with distributed memory can be described as a p... more ABSTRACT A heterogeneous parallel computer system with distributed memory can be described as a parallel computer system where each processor has its own queue and different departure rate. A good way of modeling the performance of the system is to consider the whole queuing network of the system, including the I/O queuing systems. Analytic queuing method of modeling performance has its limitation because of its inability to determine the exact convergence of some mathematical series that are involved in the modeling. Simulation queuing method that is based on recursive models can be used in performance modeling, but it has the limitation of exponential time complexity, especially when a recursive model has more than one recursive calls. This paper uses a combination of analytic queuing method and simulation queuing method to eliminate the above limitations.

Performance Metrics of Compute Intensive Applications of a Single Processor Computer System

2011 Fifth Asia Modelling Symposium, 2011

ABSTRACT From queuing system approach, a compute intensive application of a single processor comp... more ABSTRACT From queuing system approach, a compute intensive application of a single processor computer system can be defined as any application of a single processor computer system where the arrival rate of processes into the processor queue is greater than the departure rate of the processes from the processor. on the other hand, a non-compute intensive application can be defined as any application where the arrival rate is less than the departure rate. A single processor computer system can be used for compute intensive and non-compute intensive applications. In a compute intensive application, the processor is busy most of the time because there is always job to be executed. This paper, therefore, aims at using a novel and efficient queuing approach to model some of the performance metrics of compute intensive applications of a single processor computer system.

Evaluating the Performance of Parallel Computer System Using Recursive Models

2010 Fourth UKSim European Symposium on Computer Modeling and Simulation, 2010

A shared memory parallel computer system can be considered as a parallel computer system with a s... more A shared memory parallel computer system can be considered as a parallel computer system with a shared single ready queue. This can depict a single queue parallel server queuing model. Some models that are based on probability density function have been used to model the performance of the queuing system. This paper uses recursive to evaluate the performance of a

Modeling the Performance of Computer Intensive Applications of a Parallel Computer

2010 Second International Conference on Computational Intelligence, Modelling and Simulation, 2010

From the queuing system approach, a compute intensive application can be defined as any applicati... more From the queuing system approach, a compute intensive application can be defined as any application where the arrival rate of processes into the processors queue is greater than the overall departure rate of the processes from the processors. Such a compute intensive application is ideal for a parallel computer because there are always processes for the processors to execute. This paper, therefore, aims at using a novel and efficient queuing approach to model some of the performance metrics of the parallel processors, for compute intensive applications.

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Modeling Variation of Performance Metric of Distributed Memory Heterogeneous Parallel Computer System Using Recursive Models

2011 Third International Conference on Computational Intelligence, Modelling & Simulation, 2011

In a heterogeneous parallel computer system, the computational power of each of the processors di... more In a heterogeneous parallel computer system, the computational power of each of the processors differs from one another. Furthermore, with distributed memory, the capacity of the memory, which is distributed to each of the processors, differs from one another. Using queuing system to describe a distributed memory heterogeneous parallel computer system, each of the heterogeneous processors will have its own heterogeneous queue. The variation of a performance metric of heterogeneous parallel computer system with distributed memory needs to be modeled because it will help designers of parallel computer system to determine the extent of variation of a performance metric. It will also help users to know when to realize minimum variation of a performance metric. This paper models the variation of a performance metric of distributed memory heterogeneous parallel computer system using analytic and recursive models.