NUST Institutions Library Catalogue Search for 'an:"16358"'

Introduction to computer science

By Bartee, Thomas C.. 1975

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Agent-based Crowd Simulations, Analysis and Optimization of Pedestrians Flow during Hajj /

By Haris, Muhammad. Islamabad : SEECS - NUST, 2018 . xi, 66 p. : ill. ; , Hardcover. 30cm..

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Next-Generation Botnets /

By Haris Muhammad.. Isalamabad: SEECS - NUST, 2019 . 59 p. : ill. ; 36cm..

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Energy Harvesting by Bio Inspired Fins Using Rectangular Cylinders of Different Aspect Ratio /

By Haris, Muhammad . . 64p. , In order to operate a micro electromechanical device, we need a small amount of energy. In this research, we suggested an energy harvesting system based on wake flow for these types of devices. Energy harvesting using piezoelectric flag is a renewable energy source which attain a lot of interest in the research field. The flag oscillates when the fluid force at certain velocity strikes the bluff body. It is positioned at the wake of the cylinder, and it functions as cantilever beam. When the water strikes the bluff body vortices is generated which tend to oscillate the flag and energy is transferred. The kinetic energy of the fluid is converted into electric energy using the piezoelectric flag and supplied directly to the small sensors when needed. Cross section area of the cylinders and different parameters strongly influenced on the power output. To investigate the impact of parameter on the energy harvesting, a flexible flag is used. Detail experimentation was performed to investigate the influence of parameter with change in aspect ratio of cylinder on the power output. In this study, rectangular cylinder of different aspect ratio (1, 1.2 and 1.4) with bio inspired fins (Dorsal, Pectoral and Pelvic) were used. Apart from bluff body, other parameter like streamwise gap (Gx), stiffness of the flag and velocity plays an Important role in the energy harvesting. Total 63 cases were performed in our study and in each case 1 – 1.5min video was recorded to investigate the flapping of the eel. Total nine different type of cylinders was used in our study on which experimentation was done at different streamwise gaps. Streamwise gap (Gx) varies from 1 - 4. By varying the Gx we have found out that at some position the coupling of the wake with the piezoelectric flag is good enough and produce maximum strain. The results concluded that by using Dorsal fins having 1.2 A.R rectangular cylinder gives maximum power. Maximum power was achieved at Gx = 3.5 which is 82.74µW. Minimum power was shown in 1 A.R rectangular cylinder in Dorsal fin at Gx = 1 which is 7.63µW. We had compared the hollow circular cylinder with our study, 5-10% more power was harvested. 30cm.

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Design and Development of an Air-Driven Posture Correction Device /

By Haris, Muhammad. . 129p. , The prevalence of postural kyphosis continues to rise across all demographics because of inactive lifestyles and extended screen time usage which has established itself as a major musculoskeletal issue. The current solutions including static braces and feedback-only wearables, fail to provide adaptability and comfort with active correction features. This restricts their ability to achieve longterm success and user adherence. The research introduces a new wearable air-driven posture correction device which combines real-time sensing with pneumatic actuation to treat flexible thoracic kyphosis. The proposed wearable tech device focuses on posture correction by integrating multiple features into one compact device. The system includes an MPU-6050 inertial measurement unit which tracks the user’s trunk in real time in six degrees of freedom. A microcontroller processes this data and determines if changes to posture exceed a calibrated angular threshold. If so, the system triggers a pneumatic actuation module within an orthopedic vest that has been altered for this purpose. This module includes butyl rubber chambers which are constrained but designed to inflate and mechanically stress the upper back by simulating the action of scapular retractor muscles. To measure the corrective force, force-sensitive resistors (FSRs) are placed where the actuators and the body interface. A closed-loop control system dynamically adaptive and responsive to real time conditions with sensor fusion guarantees timely action and feedback. The prototype was tested by means of both objective and subjective methods, with a full-scale experimental protocol involving 24 healthy participants. Data collected in this study included realtime pitch angle vs actuator force, and subjective user feedback through standardized ergonomic surveys such as the Borg CR10 scale, Corlett & Bishop discomfort map, and the System Usability Scale (SUS). Results indicate that the system successfully minimized thoracic pitch deviation while maintaining safe tactile force levels, achieving average corrective pressures of 7–12 kPa, resulting in notable postural enhancement. The system reliably attained enhancements in posture, surpassing 85% in 22 out of 24 participants. This work contributes a fully automated, textile-integrated pneumatic solution for posture correction, combining real-time sensing, adaptive actuation, and ergonomic design. The proposed xix system offers a replicable framework for intelligent musculoskeletal rehabilitation wearables and lays the groundwork for future closed-loop personalization strategies in postural health technologies. 30cm..

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