Talpur A.,Mehran UET |
Newe T.,University of Limerick |
Shaikh F.K.,Mehran UET |
Sheikh A.A.,Mehran UET |
And 2 more authors.
International Conference on Information Networking | Year: 2017
Wireless sensor networks are emerging systems that can be used to monitor a variety of environments and communicate data to the relevant destination. This work scrutinizes the broadcast overhead problem in distributed sensor networks and propose a probabilistic structure (bloom filter) based technique, a new broadcast structure that attempts to reduce the number of duplicate copies of a packet at every node. This work shows that bloom based structure comes with a solution of a decreased energy consumption in the broadcast while achieving a full network coverage. The bloom filter is used for two purposes. First, to maintain the record of nodes requiring services from the central system in the form of an urgent member filter and communicate it reliably to the end node. Second, to create a neighbor filter. The unique idea of bloom based network uses a neighbor filter to incorporate the neighbor information on taking a forwarding decision and reduce broadcast overhead, i.e., the amount of duplication of packets at nodes. The simulation results show that use of bloom filter can achieve reduction in broadcast overhead by a minimum factor of 8 compared with the conventional broadcast system. In addition, it helps to reduce energy usage evenly throughout the network with 1/10 times and increases the lifetime of a network by having control over network density usage. The network density usage is compared with some existing broadcast control algorithms. © 2017 IEEE.
Memon T.D.,Mehran UET |
Baig S.F.,Mehran UET |
Deshi M.,Mehran UET |
Kalwar I.H.,Mehran UET
2017 6th Mediterranean Conference on Embedded Computing, MECO 2017 - Including ECYPS 2017, Proceedings | Year: 2017
Recently single-bit ternary FIR-like filter (SBTFF) hardware synthesize in FPGA is reported and compared with multi-bit FIR filter on similar spectral characteristics. Results shows that SBTFF dominates upon multi-bit filter overall. In this work, we have adopted ternary sigma-delta modulated arithmetic adder (i.e., improved ternary adder (ITA)) and simulated it in ModelSim for functional verification. Further, it is synthesized in Xilinx for chip cost and its maximum performance measured in (FMAX) compared to conventional adder module used in SBTFF. The synthesize results show that ITA performs excellent while inputs are higher than 64 with lower chip areas, whereas its performance is poor at lower inputs compared to conventional adder. These results enhance the usefulness of existing short word length DSP algorithms for fast and efficient mobile communication. © 2017 IEEE.
Qureshi N.M.F.,Sungkyunkwan University |
Shin D.R.,Sungkyunkwan University |
Siddiqui I.F.,Mehran UET
Journal of Theoretical and Applied Information Technology | Year: 2017
By virtue of its built-in processing capabilities for large datasets, Hadoop ecosystem has been utilized to solve many critical problems. The ecosystem consists of three components; client, Namenode and Datanode, where client is a user component that requests cluster operations through Namenode and processes data blocks at Datanode enabled with Hadoop Distributed File System (HDFS). Recently, HDFS has launched an add-on to connect a client through Network File System (NFS) that can upload and download set of data blocks over Hadoop cluster. In this way, a client is not considered as part of the HDFS and could perform read and write operations through a contrast file system. This HDFS NFS gateway has raised many security concerns, most particularly; no reliable authentication support of upload and download of data blocks, no local and remote client efficient connectivity, and HDFS mounting durability issues through untrusted connectivity. To stabilize the NFS gateway strategy, we present in this paper a Key Exchange Authentication Protocol (KEAP) between NFS enabled client and HDFS NFS gateway. The proposed approach provides cryptographic assurance of authentication between clients and gateway. The protocol empowers local and remote client to reduce the problem of session lagging over server instances. Moreover, KEAP-NFS enabled client increases durability through stabilized session and increases ordered writes through HDFS trusted authorization. The experimental evaluation depicts that KEAP-NFS enabled client increases local and remote client I/O stability, increases durability of HDFS mount, and manages ordered and unordered writes over HDFS Hadoop cluster. © 2005 – ongoing JATIT & LLS.
Hamid S.,Mehran UET |
Talpur A.,Mehran UET |
Shaikh F.K.,Mehran UET |
Sheikh A.A.,University of Umm Al - Qura |
Felemban E.,University of Umm Al - Qura
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST | Year: 2017
The Wireless Body Area Networks (WBANs) are a specific group of Wireless Sensor Networks (WSNs) that are used to establish patient monitoring systems which facilitate remote sensing of patients over a long period of time. In this type of system, there is possibility that the information accessible to the health expert at the end point may divert from the original information generated. In some cases, these variations may cause an expert to make a diverse decision from what would have been made specified to the original data. The proposed work contributes toward overcoming this foremost difficulty by defining a quality of information (QoI) metric that helps to preserve the required information. In this paper, we analytically model the QoI as reliability of data generation and reliability of data transfer in WBAN. © ICST Institute forComputer Sciences, Social Informatics andTelecommunicationsEngineering 2017.
Kaloi G.S.,Shanghai JiaoTong University |
Wang J.,Shanghai JiaoTong University |
Baloch M.H.,Mehran UET
Journal of Electrical Engineering and Technology | Year: 2016
This paper presents a dynamic modeling and control of doubly fed induction-generator (DFIG) based variable speed wind-turbine. The dynamic model of DFIG is incorporated with all system components which provide simple design and controls. The penetration of wind power is increasing into electrical networks, which necessitates more comprehensive studies to recognize the interaction between the wind farms and the power grid. This paper presents the dynamic model of a DFIG based wind turbine connected to the grid system in the dq-synchronous reference frame. In this article, the feedback linearization method has proposed a controller in order to reduce the oscillation and stabilize the wind turbine system parameters based on feedback linearization concepts. Based on the nonlinear control system, the proposed approach is applied to the rotor side converter and grid side converter. The damping of the DFIG is improved in transient response. In addition, the oscillation of the stator current and DC link voltage during the generator voltage dip are reduced. To the best of author’s knowledge, the proposed control outcomes compared with conventional controller verified the effectiveness, having better performance through simulation tool Matlab. © The Korean Institute of Electrical Engineers.
Ali M.A.,Sukkur IBA |
Kumar W.,Mehran UET |
Arif M.,Mehran UET
2016 IEEE 6th International Conference on Communications and Electronics, IEEE ICCE 2016 | Year: 2016
Direct conversion transceivers are the preferred choice for the RF front-end in modern communication devices. They are simple and cheap to implement but for the case of sensitive multicarrier systems these devices may not maintain the required level of performance as regards image rejection (IR), carrier frequency offset (CFO) and direct current offset. In the presence of this non-ideal behaviour it is not possible to achieve a high signal to interference ratio (SIR). This situation necessitates the use of DSP schemes to efficiently mitigate these effects and also to relax the stringent requirements on transceiver design. In this paper we study the design of a receiver architecture which can jointly estimate the channel impulse response (CIR) as well as transmit and receive (Tx/Rx) IQ imbalance. We have proposed a simple system model for two-step iterative channel and IQ imbalance estimation using long training sequences (LTS) which are already a part of WLAN standards. In summary the proposed scheme provides an excellent low complexity solution for joint channel and Tx/Rx IQ imbalance parameter estimation. © 2016 IEEE.
Korai M.S.,Institute of Environmental Engineering & Management |
Mahar R.B.,Us Pakistan Center For Advance Studies In Water Us Pacasw |
Uqaili M.A.,Mehran UET
Energy Conversion and Management | Year: 2016
Improper disposal of municipal solid waste (MSW) has created many environmental problems in Pakistan and the country is facing energy shortages as well. The present study evaluates the biochemical and thermochemical treatment options of MSW in order to address both the endemic environmental challenges and in part the energy shortage. According to the nature of waste components, a number of scenarios were developed to optimize the waste to energy (WTE) routes. The evaluation of treatment options has been performed by mathematical equations using the special characteristics of MSW. The power generation potential (PGP) of biochemical (anaerobic digestion) has been observed in the range of 5.9–11.3 kW/ton day under various scenarios. The PGP of Refuse Derived Fuel (RDF), Mass Burn Incinerator (MBI), Gasification/Pyrolysis (Gasi./Pyro.) and Plasma Arc Gasification (PAG) have been found to be in the range of 2.7–118.6 kW/ton day, 3.8–164.7 kW/ton day, 4.2–184.5 kW/ton day and 5.2–224 kW/ton day, respectively. The highest values of biochemical and all thermochemical technologies have been obtained through the use of scenarios including the putrescible components (PCs) of MSW such as food and yard wastes, and the non-biodegradable components (NBCs) of MSW such as plastic, rubber, leather, textile and wood respectively. Therefore, routes which include these components are the optimized WTE routes for maximum PGP by biochemical and thermochemical treatments of MSW. The findings of study lead to recommend that socio-economic and environmental feasibility of WTE conversion technologies should be performed in the context of the country. © 2016 Elsevier Ltd
Rauf Ab.,Mehran UET |
Faisal H.,Mehran UET |
Asadullah M.,Mehran UET
IET Conference Publications | Year: 2015
Methane Hydrates is the future of natural gas to meet its growing needs. For decades, gas hydrates have been discussed as a potential resource, particularly for countries with limited access to conventional hydrocarbons. But now it is of prime importance to know the value of Ice that burns and follow the Japan Oil, Gas, and Metals National Corporation techniques to produce methane hydrates. Methane hydrates are a potential energy resource: A frequently quoted estimate of the global methane hydrate resource is 20,000 trillion cubic meters, or about 700,000 Tcf. However, only a small portion of this enormous resource should be harvested as an energy fuel.
Memon R.A.,Mehran UET |
Khaskheli G.B.,Mehran UET |
Dahani M.A.,National Highway Authority
International Journal of Civil Engineering | Year: 2012
Present study is an extension of earlier work carried out on two-lane two way roads in the two provinces of Pakistan i.e. N-25, N-55 and N-5 regarding the measure of operating speed and development of operating speed prediction models. Curved sections of two-lane rural highways are the main location of run-off road accidents. In addition to that the road alignment having combination of geometric elements may be more harmful to the drivers than the successive features with adequate separation. This study is carried out on two-lane two-way road along N-65 (from Sibi to Quetta). Three sections are selected for study with thirty three horizontal curves. Continuous speed profile data was recorded with the help of VBox (GPS based device) which was attached with a vehicle to detect vehicle position through satellite signals. VBox is new equipment with modern technology in this field and it helps in recording continuous speed profile and saving of this information on the computer as a permanent record. Through the regression analysis, models were developed for estimation of operating speed on horizontal curves and on tangent, and estimation of maximum speed reduction from tangent to curve. The validation of developed model shows compatibility with the experimental data.
Mahar F.,Iqra University |
Ali S.A.,Iqra University |
Hussain A.,Korea University |
Bhutto Z.,Mehran UET
International Conference on Control, Automation and Systems | Year: 2011
Thus far, researchers test several heuristic in order to produce the optimal solutions of the cost function and controller parameters. In this paper, an implementation of the Ant Colony Optimization (ACO) algorithm for the optimization of cost function and controller parameters has been discussed. To implement the ACO algorithm with a problem requires defining; cost function and the constraint. All simulation has been performed using a software program developed in the MATLAB environment. The simulation results show that ACO algorithm can be used to counterbalance the effect and improve the performance of any control system. Moreover, the proposed scheme overcomes the weaknesses of conventional fixed gain controller and improvement is accomplished in terms of settling time, oscillations and overshoot. © 2011 ICROS.