Faheem Khan - Academia.edu (original) (raw)

Papers by Faheem Khan

With the rapid development of Internet and Cloud computing, there are more and more network resou... more With the rapid development of Internet and Cloud computing, there are more and more network resources. Sharing, management and on-demand allocation of network resources are particularly important in Cloud computing. Platform as a Service (PaaS) is one of the key services in Cloud computing. PaaS is very attractive for schools, research institutions and enterprises which need reducing IT costs, improving computing platform sharing and meeting license constraints. However, nearly all current available cloud computing platforms are either proprietary or their software infrastructure is invisible to the research community except for a few open-source platforms. For universities and research institutes, more open and testable experimental platforms are needed in a lab-level with PCs. In this paper, a framework for managing PaaS in a virtual Cloud computing lab is developed. The framework implements the user management, resource management and access management. The system has good expand...

JPMA. The Journal of the Pakistan Medical Association, 2021

academic institute and is the growth hormone for faculty. Almost every institute and faculty memb... more academic institute and is the growth hormone for faculty. Almost every institute and faculty member want the recognition, but few reach excellence. This is more so for developing countries, where research generally comes after service delivery and education. Pakistan has just four medical journals indexed in PubMed as compared to more than two dozen medical journals from its neighbouring country India.1,2 This explains the state-of-affairs about research in Pakistan. This paper will help in identifying the barriers that slows or stops the progress in inculcating research as the lifeline of academia, in Pakistan.

Sensors (Basel, Switzerland), 2020

The bending resonance of micro-sized resonators has been utilized to study adsorption of analyte ... more The bending resonance of micro-sized resonators has been utilized to study adsorption of analyte molecules in complex fluids of picogram quantity. Traditionally, the analysis to characterize the resonance frequency has focused solely on the mass change, whereas the effect of interfacial tension of the fluid has been largely neglected. By observing forced vibrations of a microfluidic cantilever filled with a series of alkanes using a laser Doppler vibrometer (LDV), we studied the effect of surface and interfacial tension on the resonance frequency. Here, we incorporated the Young–Laplace equation into the Euler–Bernoulli beam theory to consider extra stress that surface and interface tension exerts on the vibration of the cantilever. Based on the hypothesis that the near-surface region of a continuum is subject to the extra stress, thin surface and interface layers are introduced to our model. The thin layer is subject to an axial force exerted by the extra stress, which in turn affe...

This paper discusses a multiport converter which consists of a single power processing stage with... more This paper discusses a multiport converter which consists of a single power processing stage with multiple input ports and single output port. Here, solar energy is considered as the main source and battery as the energy storage device. The system comprises of a Photovoltaic panel, lead acid battery, triple port half bridge dc to dc converter, control circuit and the load.Simulation results of the system with synchronous regulation are discussed for low voltage application. To validate the simulation results, a laboratory prototype was developedand tested using Digital Signal Controller TMS320F28069.The experimentalresults show that the performance of the converter is as expected.

PloS one, 2017

In the past 20 years, our understanding of acute respiratory distress syndrome (ARDS) management ... more In the past 20 years, our understanding of acute respiratory distress syndrome (ARDS) management has improved, but the worldwide incidence and current outcomes are unclear. The reported incidence is highly variable, and no studies specifically characterise ARDS epidemiology in Asia. This observation study aims to determine the incidence, mortality and management practices of ARDS in a high income South East Asian country. We conducted a prospective, population based observational study in 6 public hospitals. During a one month period, we identified all ARDS patients admitted to public hospital intensive care units (ICU) in Singapore, according to the Berlin definition. Demographic information, clinical management data and ICU outcome data was collected. A total of 904 adult patients were admitted to ICU during the study period and 15 patients met ARDS criteria. The unadjusted incidence of ARDS was 4.5 cases per 100,000 population, accounting for 1.25% of all ICU patients. Most patie...

Oncotarget, Jan 13, 2017

The biology of sperm, its capability of fertilizing an egg and its role in sex ratio are the majo... more The biology of sperm, its capability of fertilizing an egg and its role in sex ratio are the major biological questions in reproductive biology. To answer these question we integrated X and Y chromosome transcriptome across different species: Bos taurus and Sus scrofa and identified reproductive driver genes based on Weighted Gene Co-Expression Network Analysis (WGCNA) algorithm. Our strategy resulted in 11007 and 10445 unique genes consisting of 9 and 11 reproductive modules in Bos taurus and Sus scrofa, respectively. The consensus module calculation yields an overall 167 overlapped genes which were mapped to 846 DEGs in Bos taurus to finally get a list of 67 dual feature genes. We develop gene co-expression network of selected 67 genes that consists of 58 nodes (27 down-regulated and 31 up-regulated genes) enriched to 66 GO biological process (BP) including 6 GO annotations related to reproduction and two KEGG pathways. Moreover, we searched significantly related TF (ISRE, AP1FJ, ...

Thenormal trendin Linear Prediction (LP) techniques is fixed frame windowing. In this paper, howe... more Thenormal trendin Linear Prediction (LP) techniques is fixed frame windowing. In this paper, however, dynamic window concept is introduced whereframe size is kept variable in order to achieve efficient outcome in terms of computational cost, mean square error and prediction gain. The three famous LP techniques namely Normal Equations, Levinson Durbin Algorithm (LDA) and Leroux Gueguen Algorithm (LGA) are briefly discusse dusing variable frame windowing and the above mentioned parameters are analyzed. Simulation results for the above three algorithms suggest that LDA and LGA have shown better performance than Normal Equation method based on reduced prediction error, low computational time and high prediction gain.

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011, 2011

This paper investigates the multiuser diversity introduced by opportunistic user selection in the... more This paper investigates the multiuser diversity introduced by opportunistic user selection in the cognitive radio parallel access channel (CR-PAC), where multiple cognitive users request to access the spectral resources of the licensed user. Assuming a simple cognitive user selection strategy based on maximizing the received signal-to-interference-plus- noise ratio (SINR), we study the statistics of the SINR at the cognitive receiver. We then use this to analytically calculate the diversity gains introduced in the system due to the selection of one cognitive user amongst multiple candidates, compared to the case when only one cognitive user exists in the network and no selection occurs. Finally, we investigate potential gains for the primary network from this user selection. The results show a close match between analytical expressions and simulation results, while a tight lower bound for the multiuser gain is derived in closed form.

P p i j i j = ∈ 1 4 6 4 z z z z z z z z z z zz zz zz zz zz z z z z z z z z z z zz zz zz zz zz z ... more P p i j i j = ∈ 1 4 6 4 z z z z z z z z z z zz zz zz zz zz z z z z z z z z z z zz zz zz zz zz z z z z z z z z 4 0 1 2 1. z z +

JPMA. The Journal of the Pakistan Medical Association, 2013

To estimate the prevalence of Benzodiazepine use in the outpatient setting of general medicine cl... more To estimate the prevalence of Benzodiazepine use in the outpatient setting of general medicine clinics at a single tertiary care centre. The prospective prevalence study was conducted in the outpatient setting of Internal Medicine Clinics at Aga Khan University Hospital, Karachi, from November to December 2009. All subjects were interviewed after informed consent and variables were recorded on a specially-designed proforma. Apart from basic demographics and comorbid conditions, duration, frequency and route of benzodiazepine use, as well as the reason and who initiated it was noted. Chi-square test and t test was applied to see the association of socio demographic or clinical factors with the use of benzodiazepine. Of the 355 patients, 129 (36.33%) reported using the drug. The majority (n=86; 24.2%) were taking it on a daily basis. The highest numbers of patients using the drug were suffering from cardiovascular problems, 32 (25%) followed by 22 (17%) from endocrinology. Diazepam eq...

Analysis in Theory and Applications, 2011

In this paper, we propose a three point approximating subdivision scheme, with three shape parame... more In this paper, we propose a three point approximating subdivision scheme, with three shape parameters, that unifies three different existing three point approximating schemes. Some sufficient conditions for subdivision curve C 0 to C 3 continuity and convergence of the scheme for generating tensor product surfaces for certain ranges of parameters by using Laurent polynomial method are discussed. The systems of curve and surface design based on our scheme have been developed successfully in garment CAD especially for clothes modelling.

We consider the problem of power allocation and linear beamforming design in overlay cognitive ra... more We consider the problem of power allocation and linear beamforming design in overlay cognitive radio (CR) networks where the cognitive user is admitted to transmit simultaneously with the primary user. To compensate the interference caused at the primary receiver (PR), the secondary transmitter (ST) uses part of its power to forward the primary user's message. The objective of cognitive user is to design a joint power allocation and beamforming scheme such that the signal-to-interference-plus-noise ratio (SINR) at the secondary receiver (SR) is maximized. We propose algorithms based on uniform quantization and sequential search to solve the corresponding non-convex optimization problems. We perform sequential search over at most three real variables for the case of single-input multiple-output (SIMO) cognitive link, and four real variables for the case of multiple-input single-output (MISO) cognitive link, respectively. It is shown that the computational complexity for solving the formulated problems does not increase significantly with the number of receive (transmit) antennas in the cognitive link. Simulation results show that the multiple-antenna configurations yield improved system performance compared to the case of single-input single-output (SISO) cognitive link. In the case of transmit beamforming, the proposed beamforming scheme shows much better performance than the traditional zero-forcing (ZF) beamforming.

Tobacco is one of the main cash crops of Pakistan. Certainly, the growers cultivate this crop for... more Tobacco is one of the main cash crops of Pakistan. Certainly, the growers cultivate this crop for economic stability. Therefore, this research is conducted to study the role of private tobacco companies in promotion of tobacco crop at Malakand division of Khyber Pakhtunkhwa province. Multi-stage sampling technique applied for selection of the sample. Thus, total 135 tobacco growers were selected for this study by the appropriate methods. Meanwhile, the results reveal that maximum 82.96, 72.59, 85.18 and 65.18% tobacco growers were young and middle age (up to 50 years), educated up to bachelor degree, well-experience of farming practices up to 20-30 years and small size up to 2.5 acres respectively. Moreover, mostly 85.18, 85.18, 75.55 and 68.14% tobacco growers had provided facilities related seeds, nursery establishment, fertilizers and pesticides application respectively by private tobacco companies. Further, the response of tobacco growers recorded that seed facilities were excel...

Amid growing concerns on the popularity of the civil service among the students, the study report... more Amid growing concerns on the popularity of the civil service among the students, the study reports the findings of a perception survey of enrolled university students. Contrary to common perceptions, the results suggest that the civil service still retains its allure among the potential entrants. Those who prefer the civil service as a career are more concerned with job security

The study has been carried out to measure the incidence of government spending on education in Pa... more The study has been carried out to measure the incidence of government spending on education in Pakistan at the provincial (both rural and urban) level, using the primary data of the Pakistan Social Standard Living Measures Survey (PSLM), 2004-2005, and by employing the three-step Benefit Incidence Approach methodology. The paper reviews the national policies emphasising provision of education in Pakistan,

PIDE-Working Papers, 2007

Provision of safe drinking water, adequate sanitation and personal hygiene are vital for the sust... more Provision of safe drinking water, adequate sanitation and personal hygiene are vital for the sustainable environmental conditions and reducing the incidence of diarrhoea, malaria, trachoma, hepatitis A & B and morbidity levels. Not having access to water and sanitation is a courteous expression for a form of deprivation that threatens life, destroys opportunity and undermines human dignity. Thus, investing in the provision of safe water supply and adequate sanitation is not only a development oriented strategy in itself, it can also yield other socio-economic benefits in terms of improved health status, quality of labour force and reduced burden-of-disease.

2010 International Conference on Signal Processing and Communications (SPCOM), 2010

Page 1. Outage Performance of Causal Cognitive Radio Z-interference Fading Channel with Cognitive... more Page 1. Outage Performance of Causal Cognitive Radio Z-interference Fading Channel with Cognitive Relaying Faheem A. Khan, T. Ratnarajah ECIT, Queen's University of Belfast Queen's Road, Queen's Island Belfast, BT3 9DT, UK Email: fkhan03@qub.ac.uk ...

Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management - CogART '11, 2011

Page 1. Interference Driven Linear Precoding for Cognitive Radio Downlink Faheem A. Khan, C. Maso... more Page 1. Interference Driven Linear Precoding for Cognitive Radio Downlink Faheem A. Khan, C. Masouros, and T. Ratnarajah ECIT, Queen&#x27;s University of Belfast Queen&#x27;s Road, Queen&#x27;s Island Belfast, BT3 9DT, UK fkhan03 ...

2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011

We consider the overlay cognitive radio channel where the cognitive user is admitted to transmit ... more We consider the overlay cognitive radio channel where the cognitive user is admitted to transmit simultaneously with the primary user provided that the instantaneous rate of primary link is not degraded. Assuming causal knowledge of the primary user's message at the cognitive transmitter (CT), we analyze the transmission rates of the cognitive user in the singleinput multiple-output (SIMO) and the multiple-input singleoutput (MISO) configurations. In particular, the CT uses a part of its transmit power to assist the primary user in delivering the primary user's message and the other part of its power is used to deliver its own message. The transmit power and the beamformers are designed to maximize the rate of the cognitive user while fixing the the rate of the primary user. Our simulation results show that the proposed scheme yields improved system performance compared to the interweave scheme where any interference to the primary user is prohibited.

2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS), 2009

Abstract In this paper, we first analyze the outage performance of two user cognitive radio chan... more Abstract In this paper, we first analyze the outage performance of two user cognitive radio channel where the cognitive user causally obtains primary user&amp;amp;amp;amp;amp;#x27;s message knowledge. Specifically, we consider cognitive rayleigh fading channel where the cognitive user uses superposition ...