Qureshi M.S.,University of Agriculture, Peshawar |
Qureshi I.H.,Center for Advance Studies in Engineering
IOP Conference Series: Materials Science and Engineering | Year: 2013
The Khyber Pakhtunkhwa province of Pakistan is rich in livestock resources, including 14.84 million sheep and goats (valued at US$1.60 billion) and a 27% share of the national poultry sector (having an investment of US$2.00 billion), and produces 834 billion kg meat. These huge assets have the potential to support the provincial economy through income generation, self employment and production of certified high-quality food items for the domestic and international Halal Food Market. A model has been developed for analyzing the gaps in the status of health, productivity, nutrition, fertility and management aspects of local farming. Improved practices would be introduced to combat the losses. The model will comprise a farming network linked to farmers' welfare centre, a central lab and an expert group. A strong sensing technology network would be introduced for data transfer and quality control of the inputs and products. The farmers will e-tag their animals for the purpose of traceability, online history and biodata. The data will be maintained in remote and central servers. A communication system would be developed utilizing mobile phones for the prices, demands and availability status of inputs and produce at local and international markets. A mobile money transfer system will be introduced to exchange, save and borrow small amounts of capital as well as take out short-term insurance policies. © Published under licence by IOP Publishing Ltd.
Naeem H.M.Y.,Center for Advance Studies in Engineering |
Mahmood A.,Center for Advance Studies in Engineering
2016 International Conference on Intelligent Systems Engineering, ICISE 2016 | Year: 2016
This paper describes a modeling and controlling of autonomous cruise control of autonomous car using bond graph modeling. We developed model using bond graph formulation by incorporating actuator dynamics and finally state space representation. We later subjected this model to robust control theory to modify the nominal model to standard format used for parametric uncertainty. We finally synthesized using LQR and H2 control technique and compared the results of a feedback system. © 2016 IEEE.
Riaz K.,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology |
Bazaz S.A.,Center for Advance Studies in Engineering |
Saleem M.M.,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology |
Shakoor R.I.,National Institute of Lasers and Optronics NILOP
Sensors and Actuators, A: Physical | Year: 2011
This paper reports the design implementation of three degree-of-freedom (3-DoF) non-resonant MEMS gyroscope having 2-DoF drive-mode oscillator. The proposed architecture utilizes structurally decoupled active-passive mass configuration to achieve dynamic amplification of oscillation in 2-DoF drive-mode. This results in higher sensitivity and eliminates the need of mode matching for resonance. A low cost standard Metal-Multi User MEMS Processes (MetalMUMPs) is used to fabricate 20 μm thick nickel based gyroscope with an overall reduced size of 2.2 mm × 2.6 mm. The experimental characterization demonstrated that the frequency response of the 2-DoF drive-mode oscillator has two resonant peaks at 754 Hz and 2.170 kHz with a flat operational region of 1.4 kHz between the peaks. The sense-mode resonant frequency lies at 1.868 kHz within this flat operational region where gain is less sensitive to structural parameters and environmental variations. This results in improved robustness to fabrication imperfections and environmental variations and long term stability without utilizing tuning and feedback control. Gyroscope dynamics and system level simulations using behavioral modeling are carried out to predict the performance of the device. Experimental results show close agreement with the behavioral simulation results due to incorporation of improved damping models in behavioral model developed in CoventorWare.
Iqbal S.,Center for Advance Studies in Engineering |
Bhatti A.I.,Center for Advance Studies in Engineering |
Akhtar M.,IDS Inc |
Ullah S.,IDS Inc
2007 European Control Conference, ECC 2007 | Year: 2015
Motion controlled stabilized platform is a 2DOF parallel manipulator which has been developed to reject angular disturbances and keep its surface horizontal. It is used for the stabilization of heavy loads such as antennas, surgery tables, etc in ocean going crafts. Use of variety of payloads causes significant changes in the dynamic properties of the plant. The controller has to be robust against the uncertainties caused by the change of payload. Two facets of this paper are the robust controller design and robustness evaluation. Traditionally such a platform is modeled through time varying nonlinear model, thus providing the rationale for a nonlinear or adaptive controller. In this paper the authors have proposed that linear identification methods may be used to establish a linear model for a particular load condition. Secondly a robust controller is designed using H∞ based method , so that the designed controller may be robust against other load variations. The method facilitates modeling of the plant with complex loads. In this work, first, a model has been identified by input/output measurements, after that a control design procedure based on H∞ optimization is used, which explicitly trade between nominal performance and robust stability. The performance and robustness is evaluated at different loads. The designed controller is compared with an existing phase lead controller and shows obvious improvements for load variations. It is shown by experiments, both in simulation and on actual rig that design through H∞ is suitable controller design method for robustness as well as performance. The design choices made are validated by simulation results and rigorous testing on the actual stabilized platform. © 2007 EUCA.
Zaidi N.A.,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology |
Bazaz S.A.,Center for Advance Studies in Engineering
Industrial Robot | Year: 2014
Purpose - The purpose of this paper is to present the design of a microgripper system that comprises a dual jaw actuation mechanism with contact sensing. Design/methodology/approach - Interdigitated lateral comb-drive-based electrostatic actuator is used to move the gripper arms. Simultaneous contact sensing of the gripper jaws has been achieved through transverse comb-based capacitive sensor. The fabricated microgripper produces a displacement of 16 μm at gripper jaws for an applied actuation voltage of 45 V. Findings - It is observed that the microgripper fails to operate for the maximum performance limits (70 μm jaws displacement) and produces uncontrolled force at the tip of the jaws > 45 V. Originality/value - A novel behavioral model of the microgripper system is proposed using the fabricated dimensions of the system to carry out a detailed analysis to understand the cause of this failure. The failure analysis shows that the microgripper system failed to operate in its designed limits due to the presence of side instability in the designed combs structure. Our proposed failure model helps in redesigning the actuator to ensure its operation above 45 V so that the gripper jaw can be displaced to its maximum limit of 70 μm and also result in the increase of the controlled force from 250 to 303 μN at the microgripper jaws. © Copyright - 2014 Emerald Group Publishing Limited. All rights reserved.
Farooq M.O.,Center for Advance Studies in Engineering |
Shah G.A.,Center for Advanced Research in Engineering
Ad-Hoc and Sensor Wireless Networks | Year: 2011
In this paper, we present an admission control with multi-path routing algorithm that establishes QoS enabled label switched paths. The algorithm provides rigorous QoS provisioning within the Differentiated Services (DiffServ) enabled mobile ad-hoc network. The proposed schemeworks by merging the signaling with the routing messages. It directs QoS sensitive traffic on multiple paths provided that each path satisfies the QoS requirements of a flow. Decision for granting admission to the flow depends upon total available bandwidth (considering the interference range), minimum delay required by an application, and delay offered by the network in a given DiffServ class. Extensive simulations are performed to measure the effectiveness of the presented idea. It is observed that our scheme meets stringent QoS requirements of real time flows compared to the existing QoS models. Each admitted flow gets low delay, low jitter and almost guaranteed bandwidth. © 2011 Old City Publishing, Inc.
Hasan A.,Air University |
Ali A.,Center for Advance Studies in Engineering
Computer Communications | Year: 2015
Scheduling algorithms in ad hoc networks allow nodes to share the wireless channel so that concurrent transmissions can be decoded successfully. On one hand, scheduling needs to be efficient to maximize spatial reuse and minimize retransmissions due to collisions. But on the other hand, the scheduling algorithm needs to be easily implementable in a distributed fashion with little, if any, coordination with other nodes in the network. In this paper we propose and evaluate a simple scheduling technique that suppresses transmissions by nodes around the desired receiver. Using stochastic geometry, we derive a near-optimal guard zone which can be easily realized in a distributed manner, and exhibits about a 2-40 fold increase in capacity compared to ALOHA; the capacity increase depending primarily on the required outage probability and node density. The capacity loss is about 15-25% compared to a well-known near-optimal centralized scheme. In contrast to centralized scheduling (which is highly impractical), our scheme lends itself to distributed implementation and also protects active links. Our derivations cleanly capture how the optimal guard zone size varies with different network parameters like path loss, outage, spreading gain, and node density, and we show how these results can be used to provide protocol design guidelines. © 2014 Elsevier B.V. All rights reserved.
Qureshi W.S.,Air University |
Alvi A.-B.N.,Center for Advance Studies in Engineering
World Academy of Science, Engineering and Technology | Year: 2011
Vision based tracking problem is solved through a combination of optical flow, MACH filter and log r-θ mapping. Optical flow is used for detecting regions of movement in video frames acquired under variable lighting conditions. The region of movement is segmented and then searched for the target. A template is used for target recognition on the segmented regions for detecting the region of interest. The template is trained offline on a sequence of target images that are created using the MACH filter and log r-θ mapping. The template is applied on areas of movement in successive frames and strong correlation is seen for in-class targets. Correlation peaks above a certain threshold indicate the presence of target and the target is tracked over successive frames.
Ali A.,Center for Advance Studies in Engineering |
Hasan A.,Air University
Proceedings of 2012 9th International Bhurban Conference on Applied Sciences and Technology, IBCAST 2012 | Year: 2012
In the absence of multi-user detection techniques in ad hoc networks, interference management is done through MAC scheduling by creating suitable exclusion zones around active receivers. Applying MAC mechanisms alters the spatial distribution Φ i of parent contending nodes to thinned daughter distribution Φ s. The knowledge of post-MAC geometrical distribution of nodes is important for efficient MAC implementation. The paper provides a thinning model to capture the MAC implementation in ad hoc networks and investigates the stochastic geometry of thinned nodes. It is shown that the thinning process results in different spatial distributions that is sensitive to the robustness of the physical layer. © 2012 IEEE.
Zareen A.,Center for Advance Studies in Engineering |
Baig S.,Center for Advance Studies in Engineering
5th International Workshop on Systematic Approaches to Digital Forensic Engineering, SADFE 2010 | Year: 2010
Mobile phones and other handheld devices are everywhere now a day. Cell phones and cellular devices can be involved in a crime or other incident. Digital forensic specialists will require specialized tools for forensics examination of mobile phones for proper recovery and speedy analysis of data present on mobile phones. Based on the various extraction methods different levels of analysis can be logically grouped for evidence acquisition from mobile phones. Based on these levels (Manual, Logical, Hex-Dump, Chip-Off and Micro Read) a pyramid of forensic tools available in international market can be sketched. Scope of this paper is to excavate into challenges associated while carrying forensic analysis of mobile phones, elaborate various analysis techniques and depict a pyramid of forensic techniques and tools. © 2010 IEEE.