Ghulam Ishaq Khan Institute of Engineering Sciences and Technology

About: Ghulam Ishaq Khan Institute of Engineering Sciences and Technology is a education organization based out in Topi, Pakistan. It is known for research contribution in the topics: Thin film & Quantum efficiency. The organization has 618 authors who have published 940 publications receiving 10674 citations.

Affine Normalized Invariant Feature Extraction using Multiscale Gabor Autoconvolution

Abstract: The paper presents a hybrid technique for affine invariant feature extraction with the view of object recognition. The proposed technique first normalizes an input image by removing affine distortions from it and then spatially re-samples the affine normalized image across multiple scales, next the Gabor transform is computed for the resampled images over different frequencies and orientations. Finally autoconvolution is performed in the transformed domain to generate a set of 384 invariants. Experimental results conducted using four different standard datasets confirm the validity of the proposed approach. Beside this the error rates obtained in terms of invariant stability are significantly lower when compared to Fourier based MSA, which has proven itself to be better than moment invariants

Impact of drying temperature on the photovoltaic performance and impedance spectra of hole transport material free air processed perovskite solar cells

Abstract: Due to the rapid increase in power conversion efficiency (PCE) of organic–inorganic perovskite solar cells (PSCs) and exceeding the PCE achieved in conventional single-junction silicon solar cells this technology has become the focus of research. The quality of perovskite film plays a vital role in developing the high performance PSCs and depends upon many factors, such as, composition of the perovskite, growth method, drying temperature, etc. In this work, hole transport material free (HTM-free) glass/FTO/c-TiO2/m-TiO2/m-ZrO2/Carbon electrode based PSCs are fabricated. Effect of prevoskite drying temperature on the photovoltaic performance and impedance spectra of these devices is studied by varying temperature from 50 to 70 °C. The photovoltaic and impedance spectra of the devices are observed to be highly dependent on the drying temperature. The best power conversion efficiency is obtained for drying temperature of 60 °C. These results show that determining the optimum drying temperature is crucial to ensure formation of perovskite crystals, highest surface coverage of perovskite, highest light harvesting and successful charge extraction from the fabricated devices in order to achieve highest performance.

Fast mean shift and particle filtering based visual human tracking

Abstract: This paper presents a technique to detect and track multiple humans in a video sequence. Human detection is done using Fast Mean Shift approach. Multiple humans in a video sequence are differentiated on the basis of their color and appearance. The occlusion issue is also addressed in the paper and is removed using the particle filtering and appearance matching techniques. The technique presented for detecting and tracking are efficient and computationally inexpensive. Experimental work shows that in case of low image quality and occlusion, this approach works properly.

Closed Form Approximations For The Three Body Problem

Abstract: In this paper, an approach is developed to solve the three body problem involving masses which posses spherical symmetry. The problem dates back to the times of Poincare, and is undoubtedly one of the oldest of unsolved problems of classical mechanics. The Poincares Dictum comprehensively proves that the problem is truly insolvable as a result of the nature of the instabilities involved. We therefore refute the idea of finding exact solutions. Instead, we develop closed form analytical approximations in place of exact solutions. We will solve the problem for the case when all the masses involved have spherically symmetric mass distributions. The method of solution would include the use of a single mass to replicate the effect of two individual masses on each body. The derivation of solutions will involve the use of the Lamberts wave function and the solution will comprise of the position vectors expressed as explicit time functions.

mmW Rotman Lens-Based Sensing: An Investigation Study.

Abstract: A Rotman lens is a wideband true-time delay device. Due to its simplistic structure with wave/signal routing capabilities, it has been widely utilized as a beamforming device in numerous communication systems. Since the basic Rotman lens design incorporates multiple input, output, and dummy ports, in this study, and for the first time, we utilized a Rotman lens as a sensor. The main idea was to gather abundant information from available Rotman lens ports to obtain better sensing performance. The realized lens is optimized to work in the millimeter wave (mmW) band from 27 to 29 GHz with a focus on a central frequency of 28 GHz. The design has a footprint of 140 × 103 × 0.8 mm3. The polarity correlator was used to characterize the material under investigation.