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Papers by Muhammad Junaid

For the first time a >65 dB dynamic range fast 2.8 microseconds fiber-optic variable optical atte... more For the first time a >65 dB dynamic range fast 2.8 microseconds fiber-optic variable optical attenuator (VOA) is proposed and demonstrated by using a single bulk-acousto-optic device. The unique double pass optical design eliminates intrinsic acousto-optic interaction-based Doppler shift while a center-path positioned halfwave plate (HWP) greatly reduces polarization dependent loss (PDL) to 0.03 dB. The current VOA insertion loss is

Computer Standards & Interfaces, 2007

The World Wide Web interconnected through the internet today offers numerous specialist topic-ori... more The World Wide Web interconnected through the internet today offers numerous specialist topic-oriented or regional search engines and systems in a largely federated heterogeneous environment. Old ones continue to exist and new ones appear in spite of the tremendous progress achieved by their generic Web-wide rival competitors, because they produce better results in their areas of specialisation. However, finding and choosing the best specialised search engines or systems for a particular information need is difficult. This is made even more complicated by the fact that these engines and systems would want to carve out a niche market that generates maximum revenue for themselves. The ADSA (Adaptive Distributed Search and Advertising) Web research project has investigated the problem at some depth and had put forward a search architecture which allows many search engines to be independently owned and controlled, offering advantages over existing centralised architectures. One aspect of the architecture has been to evaluate the service management algorithms that were designed to support competing autonomous systems in a cooperative marketplace. Here we present ADSA economic model and the service management strategies that can lead to maximum revenue generation, by making informative and intelligent decisions on search price adjustments of key quantitative parameters, as well as the results of evaluation experiments and briefly discuss the need for standardised interfaces which are required if this concept is to ease development and implementation of such a marketplace in a large scale.

IEEE Transactions on Antennas and Propagation, 2005

... 2623 On the Modeling of Reflected Energy From Building Faces in Microcellular Mobile Radio Pl... more ... 2623 On the Modeling of Reflected Energy From Building Faces in Microcellular Mobile Radio Planning Tools CC Constantinou, Member, IEEE, and MJ Mughal ... Page 3. CONSTANTINOU AND MUGHAL: MODELING REFLECTED ENERGY FROM BUILDING FACES 2625 Fig. ...

Applied Energy, 2009

The energy in flowing river streams, tidal currents or other artificial water channels is being c... more The energy in flowing river streams, tidal currents or other artificial water channels is being considered as viable source of renewable power. Hydrokinetic conversion systems, albeit mostly at its early stage of development, may appear suitable in harnessing energy from such renewable resources. A number of resource quantization and demonstrations have been conducted throughout the world and it is believed that both in-land water resources and offshore ocean energy sector will benefit from this technology. In this paper, starting with a set of basic definitions pertaining to this technology, a review of the existing and upcoming conversion schemes, and their fields of applications are outlined. Based on a comprehensive survey of various hydrokinetic systems reported to date, general trends in system design, duct augmentation, and placement methods are deduced. A detailed assessment of various turbine systems (horizontal and vertical axis), along with their classification and qualitative comparison, is presented. In addition, the progression of technological advancements tracing several decades of R&D efforts are highlighted.

In conventional DFT based orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) i... more In conventional DFT based orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) is used to avoid the inter symbol interference (ISI) caused by a time dispersive channel. A solution has been proposed in literature, which involves replacing DFT with wavelet packet transform (WPT) in communication systems. WPT does not require CP and has the attraction of having much lower side

International Journal of Circuit Theory and Applications, 2005

A new compact MAX representation for 2-D continuous piecewise-linear (PWL) functions is developed... more A new compact MAX representation for 2-D continuous piecewise-linear (PWL) functions is developed in this paper. The representation is promising since it can be easily generalized into higher dimensions. We also establish the explicit functional form of basis function and demonstrate that the proposed basis function is the elementary ‘building block’ from which a fully general 2-D PWL function can be constructed. In addition, we reveal the relationship of basis function with minimal degenerate intersection and Hinging Hyperplane, which shows that the MAX model can unify Chua's canonical expression, Li's representation, lattice PWL function and Bremann's Hinging Finding Algorithm into one common theoretical framework. Copyright © 2005 John Wiley & Sons, Ltd.

Modern induction furnace draws heavy current with considerable distortion in the current waveform... more Modern induction furnace draws heavy current with considerable distortion in the current waveform. This heavy distorted current causes distortion in the system voltage. Owing to the insulation limitations at 11 KV line, it is very taxing for modern power quality analyzers to capture the exact distorted voltage waveform. However the distorted waveform of current with high amplitude, drawn by induction furnace, can be captured by these analyzers by virtue of the appropriate CT ratios of their current clamps. By using the FFT of the distorted current waveform, a new mathematical approach using MATLAB has been developed in this paper for the exact modeling of distorted voltage waveform resulted in by distorted current waveform. Finally, this new approach has further been worked out to derive mathematical relation to compute the THDv which also shows its trend as a function of distance between the supply (utility) and Induction furnace load.

For the first time a >65 dB dynamic range fast 2.8 microseconds fiber-optic variable optical atte... more For the first time a >65 dB dynamic range fast 2.8 microseconds fiber-optic variable optical attenuator (VOA) is proposed and demonstrated by using a single bulk-acousto-optic device. The unique double pass optical design eliminates intrinsic acousto-optic interaction-based Doppler shift while a center-path positioned halfwave plate (HWP) greatly reduces polarization dependent loss (PDL) to 0.03 dB. The current VOA insertion loss is

Computer Standards & Interfaces, 2007

The World Wide Web interconnected through the internet today offers numerous specialist topic-ori... more The World Wide Web interconnected through the internet today offers numerous specialist topic-oriented or regional search engines and systems in a largely federated heterogeneous environment. Old ones continue to exist and new ones appear in spite of the tremendous progress achieved by their generic Web-wide rival competitors, because they produce better results in their areas of specialisation. However, finding and choosing the best specialised search engines or systems for a particular information need is difficult. This is made even more complicated by the fact that these engines and systems would want to carve out a niche market that generates maximum revenue for themselves. The ADSA (Adaptive Distributed Search and Advertising) Web research project has investigated the problem at some depth and had put forward a search architecture which allows many search engines to be independently owned and controlled, offering advantages over existing centralised architectures. One aspect of the architecture has been to evaluate the service management algorithms that were designed to support competing autonomous systems in a cooperative marketplace. Here we present ADSA economic model and the service management strategies that can lead to maximum revenue generation, by making informative and intelligent decisions on search price adjustments of key quantitative parameters, as well as the results of evaluation experiments and briefly discuss the need for standardised interfaces which are required if this concept is to ease development and implementation of such a marketplace in a large scale.

IEEE Transactions on Antennas and Propagation, 2005

... 2623 On the Modeling of Reflected Energy From Building Faces in Microcellular Mobile Radio Pl... more ... 2623 On the Modeling of Reflected Energy From Building Faces in Microcellular Mobile Radio Planning Tools CC Constantinou, Member, IEEE, and MJ Mughal ... Page 3. CONSTANTINOU AND MUGHAL: MODELING REFLECTED ENERGY FROM BUILDING FACES 2625 Fig. ...

Applied Energy, 2009

The energy in flowing river streams, tidal currents or other artificial water channels is being c... more The energy in flowing river streams, tidal currents or other artificial water channels is being considered as viable source of renewable power. Hydrokinetic conversion systems, albeit mostly at its early stage of development, may appear suitable in harnessing energy from such renewable resources. A number of resource quantization and demonstrations have been conducted throughout the world and it is believed that both in-land water resources and offshore ocean energy sector will benefit from this technology. In this paper, starting with a set of basic definitions pertaining to this technology, a review of the existing and upcoming conversion schemes, and their fields of applications are outlined. Based on a comprehensive survey of various hydrokinetic systems reported to date, general trends in system design, duct augmentation, and placement methods are deduced. A detailed assessment of various turbine systems (horizontal and vertical axis), along with their classification and qualitative comparison, is presented. In addition, the progression of technological advancements tracing several decades of R&D efforts are highlighted.

In conventional DFT based orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) i... more In conventional DFT based orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) is used to avoid the inter symbol interference (ISI) caused by a time dispersive channel. A solution has been proposed in literature, which involves replacing DFT with wavelet packet transform (WPT) in communication systems. WPT does not require CP and has the attraction of having much lower side

International Journal of Circuit Theory and Applications, 2005

A new compact MAX representation for 2-D continuous piecewise-linear (PWL) functions is developed... more A new compact MAX representation for 2-D continuous piecewise-linear (PWL) functions is developed in this paper. The representation is promising since it can be easily generalized into higher dimensions. We also establish the explicit functional form of basis function and demonstrate that the proposed basis function is the elementary ‘building block’ from which a fully general 2-D PWL function can be constructed. In addition, we reveal the relationship of basis function with minimal degenerate intersection and Hinging Hyperplane, which shows that the MAX model can unify Chua's canonical expression, Li's representation, lattice PWL function and Bremann's Hinging Finding Algorithm into one common theoretical framework. Copyright © 2005 John Wiley & Sons, Ltd.

Modern induction furnace draws heavy current with considerable distortion in the current waveform... more Modern induction furnace draws heavy current with considerable distortion in the current waveform. This heavy distorted current causes distortion in the system voltage. Owing to the insulation limitations at 11 KV line, it is very taxing for modern power quality analyzers to capture the exact distorted voltage waveform. However the distorted waveform of current with high amplitude, drawn by induction furnace, can be captured by these analyzers by virtue of the appropriate CT ratios of their current clamps. By using the FFT of the distorted current waveform, a new mathematical approach using MATLAB has been developed in this paper for the exact modeling of distorted voltage waveform resulted in by distorted current waveform. Finally, this new approach has further been worked out to derive mathematical relation to compute the THDv which also shows its trend as a function of distance between the supply (utility) and Induction furnace load.