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Periocular Recognition Using uMLBP and Attribute Features
( Zahid Ali ),( Unsang Park ),( Jongho Nang ),( Jeong-Seon Park ),( Taehwa Hong ),( Sungjoo Park ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.12
The field of periocular biometrics has gained wide attention as an alternative or supplemental means to conventional biometric traits such as the iris or the face. Periocular biometrics provide intermediate resolution between the iris and the face, which enables it to support both. We have developed a periocular recognition system by using uniform Multiscale Local Binary Pattern (uMLBP) and attribute features. The proposed system has been evaluated in terms of major factors that need to be considered on a mobile platform (e.g., distance and facial pose) to assess the feasibility of the use of periocular biometrics on mobile devices. Experimental results showed 98.7% of rank-1 identification accuracy on a subset of the Face Recognition Grand Challenge (FRGC) database, which is the best performance among similar studies.
Face Spoofing Attack Detection Using Spatial Frequency and Gradient-Based Descriptor
( Zahid Ali ),( Unsang Park ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.2
Biometric recognition systems have been widely used for information security. Among the most popular biometric traits, there are fingerprint and face due to their high recognition accuracies. However, the security system that uses face recognition as the login method are vulnerable to face-spoofing attacks, from using printed photo or video of the valid user. In this study, we propose a fast and robust method to detect face-spoofing attacks based on the analysis of spatial frequency differences between the real and fake videos. We found that the effect of a spoofing attack stands out more prominently in certain regions of the 2D Fourier spectra and, therefore, it is adequate to use the information about those regions to classify the input video or image as real or fake. We adopt a divide-conquer-aggregate approach, where we first divide the frequency domain image into local blocks, classify each local block independently, and then aggregate all the classification results by the weighted-sum approach. The effectiveness of the methodology is demonstrated using two different publicly available databases, namely: 1) Replay Attack Database and 2) CASIA-Face Anti-Spoofing Database. Experimental results show that the proposed method provides state-of-the-art performance by processing fewer frames of each video.
Ali, Zahid,Cha, Seung Nam,Sohn, Jung Inn,Shakir, Imran,Yan, Changzeng,Kim, Jong Min,Kang, Dae Joon The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.34
<P>We report Zn doped mesoporous TiO<SUB>2</SUB> microspheres synthesized <I>via</I> a combined sol–gel and solvothermal method exhibiting excellent Li-ion insertion–extraction properties. The specific capacity of Zn doped mesoporous TiO<SUB>2</SUB> microspheres was significantly higher than that of TiO<SUB>2</SUB> nanopowder at high charge–discharge rates. The superior rate performance offered by Zn doped mesoporous TiO<SUB>2</SUB> microspheres may be attributed to enhanced electronic and ionic conductivity, which was achieved by improving the donor density <I>via</I> Zn doping and by providing a well interconnected mesoporous network of nanoparticles for the effective diffusion of Li ions. Zn doped mesoporous TiO<SUB>2</SUB> microspheres showed more than an 87% capacity retention after 100 cycles at a charge–discharge rate of 1 C, demonstrating it to be a promising approach for the development of high-performance Li ion batteries.</P> <P>Graphic Abstract</P><P>Zn doping in mesoporous TiO<SUB>2</SUB> microspheres exhibited excellent electronic and ionic conductivity for the realization of a highly stable lithium ion battery with superior rate performances. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm33315e'> </P>
Real-time Safety Monitoring Vision System for Linemen in Buckets Using Spatio-temporal Inference
Zahid Ali,Unsang Park 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
Linemen risk falls, electric shocks, burns, and other injuries during the daily job and these incidents canoften be fatal. In this paper, we present a novel vision-based real-time system for detection and tracking of variousnon-rigid safety wearables worn by linemen, in a highly cluttered environment. We set up four imaging sensors onthe repair truck’s bucket to robustly monitor the linemen from four different viewpoints. In the monitoring system,we firstly apply a novel fast background segmentation method to suppress false positives and reduce search space. Next, we represent each safety wearable with a Gaussian mixture model and track them with an LK-tracker. Inorder to track occluded or out-of-camera-view safety wearables, we propose a novel human pose inference method. The proposed method is an extension from the existing CNN-based human pose inference by utilizing light-weightcolor, shape, and space-based human pose inference mechanism. The proposed human pose inference method showsimproved performance in terms of precision, recall, and speed. Experimental results on a number of challengingsequences demonstrate the effectiveness of the proposed scheme, under complex background, prolonged occlusions,and varying color, shape, and lighting.
Ali Zahid,Mushtaq M. Asim,Abbas Yasir,Liu Wei,Wu Zhanpeng 한국탄소학회 2023 Carbon Letters Vol.33 No.3
The development of heteroatoms doped inorganic nanocrystal-carbon composites (INCCs) has attained a great focus for energy applications (energy production and energy storage). A precise approach to fabricate the INCCs with homogenous distribution of the heteroatoms with an appropriate distribution of metal atoms remains a challenge for material scientists. Herein, we proposed a facile two-step route to synthesize INCC with doping of metal (α-Fe2O3) and non-metals (N, P, O) using hydrogel formed by treating hexachlorocyclotriphosphazene (HCCP) and 3, 4, 5-trihydroxy benzoic acid (Gallic acid). Metal oxide was doped using an extrinsic doping approach by varying its content and non-metallic doping by an intrinsic doping approach. We have fabricated four different samples (INCC-0.5%, INCC-1.0%, INCC-1.5%, and INCC-2.0%), which exhibit the uniform distribution of the N, P, O, and α-Fe2O3 in the carbon architecture. These composite materials were applied as anode material in water oxidation catalysis (WOC); INCC-1.5% electro-catalyst confirmed by cyclic voltammetry (CV) with a noticeable catholic peak 0.85 V vs RHE and maximal current density 1.5 mA.cm−2. It also delivers better methanol tolerance and elongated stability than RuO2; this superior performance was attributed due to the homogenous distribution of the α-Fe2O3 causing in promotion of adsorption of O2 initially and a greater surface area of 1352.8 m2/g with hierarchical pore size distribution resulting higher rate of ion transportation and mass-flux.
Risk of Breast Cancer among Young Women and Importance of Early Screening
Memon, Zahid Ali,Kanwal, Noureen,Sami, Munam,Larik, Parsa Azam,Farooq, Mohammad Zain Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.17
Background: Breast cancer is the most common type of cancer in women throughout the world. However, in comparison with Western women, it presents relatively early in women of Asian ethnicity. Early menarche, late menopause, use of OCP's, family history of benign or malignant breast disease, exposure to radiation and BMI in the under-weight range are well known risk factors for the development of breast cancer in premenopausal women. Early detection with the use of breast self-examination (BSE) and breast cancer screening programs can lead to a reduction in the mortality rates due to breast cancer. The aim of our study was to assess the risk factors for breast cancer among young women and to emphasize the importance of early screening among them. Materials and Methods: We conducted a cross-sectional study among women aged 18 to 25 using a self-administered questionnaire. Data was collected over a period of 6 months from June to December, 2014. A total of 300 young women selected randomly from Dow Medical College and various departments of Karachi University successfully completed the survey. Results: Respondents were 18-25 years of age (mean age=21.5). Out of the 300 young females, 90 (30%) had at least one risk factor, 90 (30%) had two, 40 (13%) had three, 8 (2.7%) had four, 2 (0.7%) had five while one female was found to have six positive risk factors for breast cancer. Some 66 women (22%) experienced symptoms of breast cancer such as non-cyclical pain and lumps. While 222 women (74%) had never performed breast self-examination, 22 (7.3%) had had a breast examination done by a health professional while 32 (10.7%) had participated in breast screening programs. A total of 223 (74.3%) women considered breast cancer screening important for young women. Conclusions: The percentage of young women with risk factors for breast cancer was found to be alarmingly high. Therefore, screening for breast cancer should start at an early age especially in high risk groups. Awareness about breast self-examination should be emphasized. Moreover, screening programs should be started to ensure early detection and reduction of mortality rates caused by breast cancer also in young Pakistani females.