Virtual optical buffers: a novel interpretation of OCDMA in packet switch networks [electronic resource]

, Article Journal of Lightwave Technology ; 2012, Volume 30, Issue 18, P. 2964-2975 Kazemi, R. (Reza) ; Rashidinejad, A. (Amir) ; Nashtaali, D. (Damoun) ; Salehi, J. A ; Sharif University of Technology

Abstract

Among all proposed structures for optical networks, the optical packet switching (OPS) scheme, due to its practical implementation of IPs in an optical configuration and the consequent advantages, is a prizeworthy candidate for being employed in metropolitan area network and local area network communication levels. One of the few problems frequently met using the OPS structure in the fiber-optics realm is the lack of optical buffers, thus deteriorating the system's flexibility and quality of service. For example, optical label switching networks that have been developed recently based on the generalized multiprotocol label switching protocol, profoundly suffer from this setback which is...

Virtual optical buffers: A novel interpretation of OCDMA in packet switch networks

, Article Journal of Lightwave Technology ; Volume 30, Issue 18 , July , 2012 , Pages 2964-2975 ; 07338724 (ISSN) Kazemi, R ; Rashidinejad, A ; Nashtaali, D ; Salehi, J. A ; Sharif University of Technology

IEEE 2012

Abstract

Among all proposed structures for optical networks, the optical packet switching (OPS) scheme, due to its practical implementation of IPs in an optical configuration and the consequent advantages, is a prizeworthy candidate for being employed in metropolitan area network and local area network communication levels. One of the few problems frequently met using the OPS structure in the fiber-optics realm is the lack of optical buffers, thus deteriorating the system's flexibility and quality of service. For example, optical label switching networks that have been developed recently based on the generalized multiprotocol label switching protocol, profoundly suffer from this setback which is...

Secure data over GSM based on algebraic codebooks

, Article Proceedings of IEEE East-West Design and Test Symposium, EWDTS 2013, Rostov-on-Don ; 2013 ; 9781479920969 (ISBN) Boloursaz, M ; Kazemi, R ; Nashtaali, D ; Nasiri, M ; Behnia, F ; Sharif University of Technology

2013

Abstract

This paper considers the problem of secure data communication through the Global System for Mobile communications (GSM). The algebraic codebook method for data transmission through the Adaptive Multi Rate 12.2Kbps voice channel is investigated and its maximum achievable data rate is calculated. Based on the vocoder channel properties, the method's Bit Error Rate (BER) performance is improved by repetition coding and classification methods. Simulation results show that by simultaneous application of repetition coding and clustering methods, the decoder's performance improves about 6.5% compared to the case of no clustering for 1Kbps data communication in AMR 4.75 voice codec

Design and Analysis of DNA Sequencing Methods

, Ph.D. Dissertation Sharif University of Technology Nashtaali, Damoun (Author) ; Hossein Khalaj, Babak (Supervisor) ; Abolfazl, Motahhari (Co-Advisor)

Abstract

A DNA sequence is the information source of living kinds. Information of this sequence is at its constructing bases which has four different kinds. Sequencing DNA is necessary to resolve this information. At 1977, Sanger reported the first sequence of a DNA string. Recently, a human DNA string can be sequenced with 1000 in ~2 hours. Knowing DNA sequence helps to find function of each organism, predict and cure diseases (especially in cancer). Next Generation Sequencing (NGS) methods are based on shot-gun sequencing which fragmentize DNA strings and sequence each fragment. After sequencing, processing information of DNA is performed by the processing machine in two different types: alignment...