Abstract A roaming user in ubiquitous environment should have access to different services anywhe... more Abstract A roaming user in ubiquitous environment should have access to different services anywhere anytime. In an infrastructure based smart environment, user acquires this facility from the middleware. Syntax based service discovery has proven to be inadequate for flexible interaction between user and the middleware; context based semantic matching is necessary.
Abstract: A few researches have been carried out to efficiently recognize natural Bangla sentence... more Abstract: A few researches have been carried out to efficiently recognize natural Bangla sentences. This paper proposes a technique to parse Bangla sentences in a new approach using context-free grammar rules that accepts all types of Bangla sentences including complex, compound, exclamatory and optative sentences. The proposed grammar also allows parsing all five categories of sentences according to Bangla intonation.
Abstract: In this paper we construct worst possible full heaps in terms of sum total of number of... more Abstract: In this paper we construct worst possible full heaps in terms of sum total of number of comparisons and movements when top-down variant of the sorting phase is used. This construction also gives us the worst heap within one comparison and one movement for non-full heaps.
A spectrally efficient (4 bit/s/Hz) 100 Gb/s long-reach PON is demonstrated based on 64-QAM and f... more A spectrally efficient (4 bit/s/Hz) 100 Gb/s long-reach PON is demonstrated based on 64-QAM and frequency interleaved directly detected optical OFDM that can potentially operate over 100 km of single mode fiber with a 1024-way-split.
We investigate the possibility of spectrally efficient 100 Gb/s transmission using IEEE 802.11a O... more We investigate the possibility of spectrally efficient 100 Gb/s transmission using IEEE 802.11a OFDM PHY based coherent optical OFDM and confirm that such systems may operate at 115.2 Gb/s with 26.5 GHz signal bandwidth.
Context delivery is an inevitable issue for ubiquitous computing. Context-aware middlewares perfo... more Context delivery is an inevitable issue for ubiquitous computing. Context-aware middlewares perform all the functions of context sensing, inferring and delivery to context-aware applications. But one of the major issues for these middlewares is to devise a context delivery scheme that is scalable as well as efficient. Pure unicast or pure broadcast based dissemination can not provide scalability as well as less average latency. In this paper we present a scalable context delivery mechanism for context-aware middlewares based on hybrid data dissemination technique where the most requested data are broadcasted and the rest are delivered through unicast. Our scheme is adaptive in the sense that it dynamically differentiates hot (most requested) and cold (less requested) data according to request rate and waiting time. Inclusion of lease mechanism and bandwidth division further allows us to reduce network traffic and average latency. We validated our claim through extensive simulation.
I. INTRODUCTION Despite the global economic slump in the recent past, the number of households wi... more I. INTRODUCTION Despite the global economic slump in the recent past, the number of households with fiber-to-the-home (FTTH) connections has been growing at a sustained rate close to 30% worldwide and will accumulate to the number of fiber-connected premises to 150 million by 2013 [1]. For example, 93% of Australian premises are expected to be connected with fiber by 2015 [2]. Such widespread deployment of FTTH makes broadband access a natural choice through fixed point optical network units (ONUs). FTTH network provides the best platform to ...
Abstract A roaming user in ubiquitous environment should have access to different services anywhe... more Abstract A roaming user in ubiquitous environment should have access to different services anywhere anytime. In an infrastructure based smart environment, user acquires this facility from the middleware. Syntax based service discovery has proven to be inadequate for flexible interaction between user and the middleware; context based semantic matching is necessary.
Abstract: A few researches have been carried out to efficiently recognize natural Bangla sentence... more Abstract: A few researches have been carried out to efficiently recognize natural Bangla sentences. This paper proposes a technique to parse Bangla sentences in a new approach using context-free grammar rules that accepts all types of Bangla sentences including complex, compound, exclamatory and optative sentences. The proposed grammar also allows parsing all five categories of sentences according to Bangla intonation.
Abstract: In this paper we construct worst possible full heaps in terms of sum total of number of... more Abstract: In this paper we construct worst possible full heaps in terms of sum total of number of comparisons and movements when top-down variant of the sorting phase is used. This construction also gives us the worst heap within one comparison and one movement for non-full heaps.
A spectrally efficient (4 bit/s/Hz) 100 Gb/s long-reach PON is demonstrated based on 64-QAM and f... more A spectrally efficient (4 bit/s/Hz) 100 Gb/s long-reach PON is demonstrated based on 64-QAM and frequency interleaved directly detected optical OFDM that can potentially operate over 100 km of single mode fiber with a 1024-way-split.
We investigate the possibility of spectrally efficient 100 Gb/s transmission using IEEE 802.11a O... more We investigate the possibility of spectrally efficient 100 Gb/s transmission using IEEE 802.11a OFDM PHY based coherent optical OFDM and confirm that such systems may operate at 115.2 Gb/s with 26.5 GHz signal bandwidth.
Context delivery is an inevitable issue for ubiquitous computing. Context-aware middlewares perfo... more Context delivery is an inevitable issue for ubiquitous computing. Context-aware middlewares perform all the functions of context sensing, inferring and delivery to context-aware applications. But one of the major issues for these middlewares is to devise a context delivery scheme that is scalable as well as efficient. Pure unicast or pure broadcast based dissemination can not provide scalability as well as less average latency. In this paper we present a scalable context delivery mechanism for context-aware middlewares based on hybrid data dissemination technique where the most requested data are broadcasted and the rest are delivered through unicast. Our scheme is adaptive in the sense that it dynamically differentiates hot (most requested) and cold (less requested) data according to request rate and waiting time. Inclusion of lease mechanism and bandwidth division further allows us to reduce network traffic and average latency. We validated our claim through extensive simulation.
I. INTRODUCTION Despite the global economic slump in the recent past, the number of households wi... more I. INTRODUCTION Despite the global economic slump in the recent past, the number of households with fiber-to-the-home (FTTH) connections has been growing at a sustained rate close to 30% worldwide and will accumulate to the number of fiber-connected premises to 150 million by 2013 [1]. For example, 93% of Australian premises are expected to be connected with fiber by 2015 [2]. Such widespread deployment of FTTH makes broadband access a natural choice through fixed point optical network units (ONUs). FTTH network provides the best platform to ...
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Papers by Lenin Mehedy