M Arif - Academia.edu (original) (raw)

Papers by M Arif

Procedings of the British Machine Vision Conference 2007, 2007

Classical shape analysis methods use principal component analysis to reduce the dimensionality of... more Classical shape analysis methods use principal component analysis to reduce the dimensionality of shape spaces. The basic assumption behind these methods is that the subspace corresponding to the major modes of variation for a particular class of shapes is linearised. This may not necessarily be the case in practice. In this paper, we present a novel method for extraction of the intrinsic parameters of multiple shape classes in an unsupervised manner. The proposed method is based on learning the global structure of shape manifolds using diffusion maps. We demonstrate that the method is effective in separating the members of different shape classes after embedding them into a low-dimensional Euclidean space.

2007 International Conference on Machine Vision, 2007

The demanding step in the development of ancillary systems for the diagnosis of cancer and other ... more The demanding step in the development of ancillary systems for the diagnosis of cancer and other diseases based on nuclear morphometry is the delineation of nuclei in the images of stained tissue sections. Various constituents of the tissue section such as cellular and extra-cellular elements, staining artefacts, debris of nuclei, and clusters of overlapping nuclei apart from the image acquisition noise to name a few contribute to in the complexity of the task. In this paper, we pose the problem of selection of nuclei in tissue section as classification of shapes using manifold learning on training images followed by out-of-sample extension for unknown test images. Experimental results demonstrate the effectiveness of the proposed algorithm Index Terms-Manifold learning, diffusion maps, nuclear morphometry, out-of-sample extension.

AGE, 2014

The ageing process is strongly influenced by nutrient balance, such that modest calorie restricti... more The ageing process is strongly influenced by nutrient balance, such that modest calorie restriction (CR) extends lifespan in mammals. Irisin, a newly described hormone released from skeletal muscles after exercise, may induce CR-like effects by increasing adipose tissue energy expenditure. Using telomere length as a marker of ageing, this study investigates associations between body composition, plasma irisin levels and peripheral blood mononuclear cell telomere length in healthy, non-obese individuals. Segmental body composition (by bioimpedance), telomere length and plasma irisin levels were assessed in 81 healthy individuals (age 43±15.8 years, BMI 24.3±2.9 kg/m 2). Data showed significant correlations between log-transformed relative telomere length and the following: age (p<0.001), height (p=0.045), total body fat percentage (p=0.031), abdominal fat percentage (p=0.038), visceral fat level (p<0.001), plasma leptin (p=0.029) and plasma irisin (p=0.011), respectively. Multiple regression analysis using backward elimination revealed that relative telomere length can be predicted by age (b=−0.00735, p= 0.001) and plasma irisin levels (b=0.04527, p=0.021). These data support the view that irisin may have a role in the modulation of both energy balance and the ageing process.

$Research paper thumbnail of An interferometric technique for measuring the refractive index profile of a graded index optical fiber$

Proceedings of National Aerospace and Electronics Conference (NAECON'94), 1994

Page 1. An Interferometric Technique For Measuring The Refractive Index Profile of a Graded Index... more Page 1. An Interferometric Technique For Measuring The Refractive Index Profile of a Graded Index Optical Fiber Kamal K. Dad, Muhammad kif ' , A. F. M. Yusuf Haider' and Mohammad S. Ala3 'University of Dayton, Center for Electro-optics, Dayton, OH 45469-0227. ...

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2005

Since the early 1990s, the National Institute of Standards and Technology (NIST) Center for Neutr... more Since the early 1990s, the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR) in Gaithersburg, MD has provided neutron beam lines to an increasing number of fundamental experiments utilizing cold and ultracold neutrons. The experiments address important issues in nuclear, particle, and astrophysics such as unitarity of the Cabibbo-Kobayashi-Maskawa matrix, time-reversal invariance, the weak interaction between nucleons, nuclear three-body forces, and the abundance of 4 He in the universe. Four beams are currently in use for fundamental physics experiments. These include three monochromatic neutron beams and a high-intensity polychromatic beam. In addition, a neutron imaging station and thermal-neutron column are available for users. The thermal column provides a large-area and uniform beam of thermal neutrons for dosimetry and neutron standards work.

Proceedings of the 37th SICE Annual Conference. International Session Papers

In this paper, the problem of convergence rate in the initial iterations for iterative learning c... more In this paper, the problem of convergence rate in the initial iterations for iterative learning control schemes is addressed. Iterative learning control using information database (ILCID) is proposed for improving the convergence rate in the initial iterations. It is assumed that proper and efficient selection of initial control input can improve the convergence rate in the initial iterations. The initial control input for a new desired trajectory is constructed by using the information database based on a similarity index defined in this paper. This method is very general and can be applicable to all iterative learning algorithms

Organic Electronics

Hybrid metal-insulator-semiconductor structures based on ethyl-hexyl substituted polyfluorene (PF... more Hybrid metal-insulator-semiconductor structures based on ethyl-hexyl substituted polyfluorene (PF2/6) as the active polymer semiconductor were fabricated on a highly doped p-Si substrate with Al 2 O 3 as the insulating oxide layer. We present detailed frequency-dependent capacitance-voltage (C-V) and conductance-voltage characteristics of the semiconductor/insulator interface. PF2/6 undergoes a transition to an ordered crystalline phase upon thermal cycling from its nematic-liquid crystalline phase, confirmed by our atomic force microscope images. Thermal cycling of the PF2/6 films significantly improves the quality of the (PF2/6)/Al 2 O 3 interface, which is identified as a reduced hysteresis in the C-V curve and a decreased interface state density (D it) from 3.9•1012eVAˋ1cmAˋ2to3.9 • 10 12 eV À1 cm À2 to 3.9•1012eVAˋ1cmAˋ2to3.3 • 10 11 eV À1 cm À2 at the flat-band voltage. Interface states give rise to energy levels that are confined to the polymer/insulator interface. A conductance loss peak, observed due to the capture and emission of carriers by the interface states, fits very well with a single time constant model from which the D it values are inferred.

Minerals, 2016

The Dopolan deposit is a Mediterranean-type bauxite located in the Zagros Fold-Thrust Zone, Iran.... more The Dopolan deposit is a Mediterranean-type bauxite located in the Zagros Fold-Thrust Zone, Iran. This deposit consists of five lithological members including iron-rich, clay-rich, oolitic, pisolitic and organic matter-containing bauxites. The mineralogy of the deposit includes diaspore, boehmite, and kaolinite, nacrite, with minor pyrite, anatase and rutile. Geochemical studies show that light rare earth elements (LREEs) are enriched relative to heavy rare earth elements (HREEs) in all members, supporting an authigenic origin. Mass changes based on Ti as an immobile element indicate that conventionally-immobile elements (Al, Nb, Ta, Zr, Hf) are enriched in situ in the residual units, whereas mobile elements (K, Ca, Si) were depleted during bauxitization. This study shows that the Khaneh-Kat argillitic dolomite is the likely parent rock. The δ 18 O (7.63‰to 9.35‰) and δD values (´49.91‰to´66.49‰) for kaolinite in the bauxite samples suggest equilibration with meteoric waters which supports a supergene origin. Bauxitization occurred in a warm climate with relatively constant isotopic composition suggesting climate stability during the development of bauxite horizons and remobilization of Al (with formation of secondary boehmite). The δ 13 C values of calcite (´7.3‰) in the bauxite support the idea that the Khaneh-Kat Formation has experienced post-depositional isotope exchange with meteoric waters during the karstification process.

18th International Conference on Pattern Recognition (ICPR'06), 2006

Different features carry more or less rich and varied pieces of information to characterize a pat... more Different features carry more or less rich and varied pieces of information to characterize a pattern. The fusion of these different sources of information can provide an opportunity to develop more efficient biometric system compared when using a feature vector. Thus a new automatic fusion methodology using different sources of information (different feature sets) is presented here. Dempster-Shafer evidence theory is employed for this purpose. For performance evaluation significqntly large data sets of the biometric sources signature and hand shqpe are used. The results on combining different feature vectors compared to a single vector with our approach prove the importance of a fusion process. H' H m(H').

2009 International Conference of Soft Computing and Pattern Recognition, 2009

In this paper, Pruned Fuzzy K-nearest neighbor (PFKNN) classifier is proposed to classify differe... more In this paper, Pruned Fuzzy K-nearest neighbor (PFKNN) classifier is proposed to classify different types of Arrhythmia beats present in the MIT-BIH Arrhythmia database. We have tested our classifier on ~103100 beats for six beat types present in the database. Fuzzy KNN (FKNN) can be implemented very easily but large number of training examples used for classification which can be very time consuming and requires large storage space. Hence, we have proposed a time efficient pruning algorithm especially suitable for FKNN which can maintain good classification accuracy with appropriate retained ratio of training data. By using the pruning algorithm with Fuzzy KNN, we have achieved beat classification accuracy of 97% and geometric mean of sensitivity is 94.5% with only 19% of the total training examples. The accuracy and sensitivity is comparable to FKNN when all the training data is used.

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2015

ABSTRACT Jatropha oil was cracked over micoporous catalysts, such as HY, HZSM-5, and HMordenite, ... more ABSTRACT Jatropha oil was cracked over micoporous catalysts, such as HY, HZSM-5, and HMordenite, at the optimized conditions obtained over Hβ towards cracking of jatropha oil. The synthesized catalysts were characterized by X-ray diffraction, Brunauer-Emmett-Teller surface area analyzer, inductively coupled plasma, and temperature programmed desorption techniques. Among the microporous materials, HZSM-5 catalyst was found to be the best in terms of conversion (62%), selectivity towards green gasoline (50%), and less coke formation (0.8%) in the cracking of jatropha oil. Cracking of other oils, such as castor, neem, and pongamia, under the optimized conditions resulted in 82% conversion of castor oil; however, higher selectivity towards green gasoline (49%) was obtained in the cracking of pongamia oil.

2009 3rd International Conference on Bioinformatics and Biomedical Engineering, 2009

This paper presents a comparison of different approaches for performing baseline removal in the e... more This paper presents a comparison of different approaches for performing baseline removal in the electrocardiogram (ECG) signal for use in an ECG based decision support system for diagnosis of coronary heart disease. Our implementations of seven different algorithms for removal of baseline from the ECG signal have been compared which include methods based on use of linear Digital filters, Adaptive filters, Multiresolution analysis and Curve fitting or polynomial based approaches. The comparison was carried out using manual ST Segment level annotations in different ST segment deviation episodes from the European Society of Cardiology (ESC) ST-T database. Results indicate that the use of Wavelet Adaptive Filter for baseline removal produces ST segment levels which are the closest to those annotated by the human expert.

The international journal of occupational and environmental medicine, 2013

In India, for the high concentration of fluoride in groundwater, people are at risk of dental flu... more In India, for the high concentration of fluoride in groundwater, people are at risk of dental fluorosis. The problem is common in various states of India. The condition in Rajasthan is worse where all districts have such a problem. To study the fluoride concentration in groundwater and prevalence of dental fluorosis in Didwana block of Nagaur district, Central Rajasthan, India. The fluoride concentration in water of 54 villages was measured electrochemically, using fluoride ion selective electrode. Dental fluorosis was assessed in 1136 people residing in study area by Dean's classification for dental fluorosis. The fluoride concentration in groundwater in studied sites ranged from 0.5 to 8.5 mg/L. The concentration of fluoride was more than the maximum permissible limit set by WHO and Bureau of Indian Standards (1 mg/L) in 48 groundwater sources. Of 1136 people studied, 788 (69.4%; 95% CI: 66.7%-72.1%) had dental fluoros---252 had mild and 74 had severe dental fluorosis. High le...

Journal of the Chemical Society, Faraday Transactions 2, 1981

Saudi journal of gastroenterology : official journal of the Saudi Gastroenterology Association, 1995

Viral etiology was investigated in 133 Saudi patients with acute hepatitis seen in King Khalid Un... more Viral etiology was investigated in 133 Saudi patients with acute hepatitis seen in King Khalid University Hospital, Riyadh. between July 1993-May 1994. Out of the 133 patients, 51 (38.3%) were diagnosed as having acute hepatitis due to hepatitis A virus (HAV). Hepatitis C virus (HCV) was the second most common etiological agent (20.3%). There were 35 patients with acute hepatitis (26.3%) in whom no viral marker for HAV, HBV, HCV, CMV or Epstein-Barr virus (EBV) was detected. Among the 51 patients with acute hepatitis due to HAV, the majority (88.2%) were children (1-12 years) and only 6 (11.8%) were adults (15-24 years). This is in contrast to patients with HCV or HBV infection where the majority were adults: 74.1% and 82.3% respectively. The diagnosis of acute hepatitis due to HAV in Saudi adults, an observation not seen earlier, indicated a change in the epidemiological pattern of HAV infection in the Saudi population. This change was confirmed by the significant reduction in the ...

JPMA. The Journal of the Pakistan Medical Association, 2003

... References. 1.Arslan M. BayraktarY, Oksuzoglu G. Kayhan B. Four cases with chronic intestinal... more ... References. 1.Arslan M. BayraktarY, Oksuzoglu G. Kayhan B. Four cases with chronic intestinal pseudo-obstruction due to hollow visceral myopathy. ... News & Events. The 10th Shaukat Khanum Memorial Cancer Symposium will take place from 18-20 November, 2011 at Lahore. ...

The Journal of general virology, 1998

A monofungal culture of Spongospora subterranea was unable to acquire and transmit the T isolate ... more A monofungal culture of Spongospora subterranea was unable to acquire and transmit the T isolate of potato mop-top pomovirus (PMTV-T), which has been maintained by manual transmission in the laboratory for 30 years. A recently obtained field isolate (PMTV-S) was efficiently acquired and transmitted by the same fungus culture. Sequence analysis of the readthrough (RT) protein-coding region of PMTV-S showed the presence of an additional 543 nt in the 3' half of the coding region relative to that of PMTV-T. These additional nucleotides preserved the reading frame of the RT protein and inserted 181 amino acids into the RT protein. This was confirmed by a comparison by immunoblotting of the sizes of the RT protein of PMTV-T and other recent isolates of PMTV.

Leukemia & lymphoma, 1997

Trisomies 3, 5 and X in six Japanese patients with AILD were detected by fluorescence in situ hyb... more Trisomies 3, 5 and X in six Japanese patients with AILD were detected by fluorescence in situ hybridization (FISH). Trisomies 3 and X were detected using centromeric probes. Cosmid probes locating on 5q31.1, the commonly deleted region, was used to detect trisomy 5. FISH detected three patients with trisomy 3 alone, one with trisomy 5 alone and one with all the three trisomies analysed. The sample that showed all three aberrations was further analysed by dual color FISH. The three trisomies were present on different cells. The AILD cells with trisomy 5 tended to replicate slowly, whereas those with trisomy 3 seem to have a proliferative advantage. An increase in the histopathological stage was reflected in the increase in the percentage of trisomy 3 cells in one patient.

Zeitschrift für mikroskopisch-anatomische Forschung, 1983

4 PF-positive NSC appear for the first time in each brain hemisphere on 4th day of exclosion. B-,... more 4 PF-positive NSC appear for the first time in each brain hemisphere on 4th day of exclosion. B-, C- and D-cells appear in the pars intercerebralis region on the second day in the 2nd instar. 3 lateral NSC appear for the first time in this instar. 2 A4-cells appear in the tritocerebral region of the 4th instar. An increase in the number and size of the NSC is noted in the successive instars. A3-cells appear for the first time in 5th instar. The secretory phases in the pupal period are completed in three "stages" which last for 3.3 and 4 days respectively. Adults lack PF-positive cells in the lateral and tritocerebral regions. Females show accumulation of NSM before mating which depletes gradually as the mating time reaches.

This paper describes our progress on a neutron interferometry search for the Aharonov-Casher (A-C... more This paper describes our progress on a neutron interferometry search for the Aharonov-Casher (A-C) effect. Unpolarized neutrons are passed through a 40 kV/mm vacuum electrode system. The spin-dependent phase is set to maximum sensitivity with a magnetic field, and the spin-independent phase is adjusted to zero (modulo 2~r) using the Earth's gravitational field. Upon reversal of the electric field, the predicted A-C phase shift is 0.2 °. Currently, our results are statistically limited.