Content-based Image Retrieval Using Haar Wavelet Transform and Color Moment

Iqbal Hasan Sarker,Shahed Iqbal 한국산학기술학회 2013 SmartCR Vol.3 No.3

Content-based image retrieval (CBIR) deals with the retrieval of most similar images corresponding to a query image from an image database by using visual contents of the image itself. It requires feature extraction and computation of similarity. In this paper, we propose a content-based image retrieval method that uses a combination of color and texture features. The Haar wavelet transform is used for texture feature extraction, and for color feature extraction we use color moments. The distance between the query image features and the database images’ features is computed by using Canberra distance. We assign weights to texture feature distance and color feature distance and calculate the similarity with combined feature distance. Experiment results reflect the importance of the Haar wavelet transform and color moments in the performance of our proposed CBIR method.

Sampling, pretreatment, and analysis of particulate matter and trace metals emitted through charcoal combustion in cooking activities

Iqbal, M.A.,Kim, K.H. Elsevier Scientific Pub. Co 2016 Trends in analytical chemistry Vol.76 No.-

<P>Charcoal is widely used today for both indoor and outdoor cooking activities such as household cooking, grilling, barbecuing, and broiling. As such, its combustion has been designated as sources of a diverse range of pollutants containing particulate matter (PM) and a list of hazardous trace metals (TMs) in both indoor/outdoor ambient air. In this work, we review the current status of technical tools and approaches to measure the pollution of PM and TMs emitted due to charcoal combustion with respect to available sampling, pretreatment, and analytical techniques. The reported concentration levels of those pollutants were compared in reference to guideline values. Finally, the potential health hazards of PMs and TMs emitted from charcoal are evaluated. Based on this approach, a concise view is provided to describe the diversity, level, and health hazards of particulate and metallic pollutants emitted through the combustion of charcoal in cooking activities. (C) 2015 Elsevier B.V. All rights reserved.</P>

Visible-Light-Mediated Synthesis of Amides from Aldehydes and Amines via in Situ Acid Chloride Formation

Iqbal, Naeem,Cho, Eun Jin American Chemical Society 2016 Journal of organic chemistry Vol.81 No.5

<P>An efficient visible-light photocatalysis-based one-pot amide synthesis method was developed; visible-light irradiation of a mixture of an aldehyde, tert-butyl hydrogen peroxide, and N-chlorosuccinimide using a Ru(bpy)(3)Cl-2 photocatalyst afforded an acid chloride, which subsequently reacted with amine to yield the corresponding amide. The reaction was used to synthesize modobemide and a D3 receptor intermediate.</P>

Enhanced Dielectric Constant, Ultralow Dielectric Loss, and High-Strength Imide-Functionalized Graphene Oxide/Hyperbranched Polyimide Nanocomposites

Iqbal, Asma,Lee, Seok Hwan,Siddiqi, Humaira Masood,Park, O. Ok,Akhter, Toheed American Chemical Society 2018 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.122 No.12

<P>We achieved for the first time the formation of a charge-transfer complex (CTC) between a novel hyperbranched polyimide (PI) and oligo-imide-functionalized graphene oxide (FGO), aiming for enhancing the dielectric properties of resulting PI-FGO nanocomposites. This novel hyperbranched PI was derived from a new diamine <I>N</I><SUP>1</SUP>,<I>N</I><SUP>1</SUP>′-(4,4′-oxybis(4,1-phenylene))bis(<I>N</I><SUP>1</SUP>-(4-aminophenyl)benzene-1,4-diamine). The imide moieties were integrated on amine-FGO via a step-by-step condensation and thermal imidization approach. This FGO exhibited excellent compatibility with hyperbranched PI because of the formation of a CTC between two domains. In viscoelastic measurements, the dynamic storage modulus and glass-transition temperature of flexible PI-FGO nanocomposites increased linearly with increasing FGO contents. The synthesized nanocomposites revealed high mechanical properties with a tensile strength as high as 1.122 GPa. Thermogravimetric analysis demonstrates that these nanocomposite films exhibit high thermal stability up to 550 °C. Remarkably, the dielectric constant increases up to 42.47 at 8 wt % FGO loading with a dielectric loss as low as 0.0018 while maintaining the breakdown strength as high as 147.3 ± 4.5 MV/m.</P> [FIG OMISSION]</BR>

A STUDY ON INVARIANT REGIONS, EXISTENCE AND UNIQUENESS OF THE GLOBAL SOLUTION FOR TRIDIAGONAL REACTION-DIFFUSION SYSTEMS

IQBAL M. BATIHA,NABILA BARROUK,ADEL OUANNAS,ABDULKARIM FARAH The Korean Society for Computational and Applied M 2023 Journal of applied mathematics & informatics Vol.41 No.4

In this article, we are devoted to study the problem of the existence, uniqueness and positivity of the global solutions of the 3 × 3 reaction-diffusion systems with the total mass of the components with time. We also suppose that the nonlinear reaction term has a critical growth with respect to the gradient. The technique that we used to prove the global existence is the method of the compact semigroup.

An enhanced synthesis of gold nanorods by the addition of Pluronic (F-127) <i>via</i> a seed mediated growth process

Iqbal, Muhammad,Chung, Yong-Il,Tae, Giyoong Royal Society of Chemistry 2007 Journal of materials chemistry Vol.17 No.4

<P>The synthesis of stable gold nanorods with higher aspect ratios (∼15–20) and more enhanced uniformity by a modified seed mediated growth approach is reported. A binary surfactant system consisting of CTAB and Pluronic F-127 was used to overcome limitations of the previous approach prepared in the presence of AgNO<SUB>3</SUB>: the continuous blue-shifting of the plasmon absorption peaks and the reshaping of the gold nanorods upon storage. The addition of Pluronic F-127 resulted in higher yield and better uniformity of the synthesized nanorods. It also led to the enhanced production of higher aspect ratio nanorods prepared in the absence of AgNO<SUB>3</SUB>. The growth conditions were optimized by varying the concentrations of reactants, mainly surfactants and gold seed. The formation, and the stability of the synthesized nanorods were characterized by VIS-NIR absorption spectra and electron microscopy.</P> <P>Graphic Abstract</P><P>We report the synthesis of stable gold nanorods with higher aspect ratios and more enhanced uniformity by a modified seed mediated growth approach using Pluronic F-127 as a co-surfactant. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b610761c'> </P>

Modulation Set Optimization for the Improved Complex Quadrature SM

Iqbal, Asif,Mohaisen, Manar,Kwak, Kyung Sup Hindawi Limited 2018 WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Vol.2018 No.-

<P>At each channel use, the complex quadrature spatial modulation (CQSM) transmits two signal symbols drawn from two disjoint modulation sets. The indices of the antennas from which symbols are transmitted also carry information. In the improved CQSM (ICQSM), an additional antenna is used to transmit the second signal symbol only when the indices of the antennas to be used for transmission are equal. Conventionally, the second modulation set is a rotated version of the first, where the rotation angle is optimized such that the average unconditional error probability (AUP) is reduced. In this paper, we propose a low-complexity method to design the PSK modulation sets based on reducing the AUP. After introducing min-BER and max- <TEX>$ d_{\mathrm{m}\mathrm{i}\mathrm{n}}$</TEX> , two exhaustive search methods, we analytically show that the AUP depends on Euclidean distance between transmitted vectors, which in turn depends on the power of signal symbols, the Euclidean distance between the symbols of each modulation set, and the Euclidean distance between the symbols of the two sets. The optimal rotation angle is analytically derived for any modulation order and the radii of the modulation sets are optimized such that AUP is reduced for a wide range of system configurations. The simulation results show that more than 3 dB of power gain is achieved in the case of 16PSK, where higher gains are achieved for higher modulation orders. These gains are achieved at no computational cost because the optimization does not depend on the channel realization.</P>

Spatially Concatenated Channel-Network Code for Underwater Wireless Sensor Networks

Iqbal, Zafar,Lee, Heung-No IEEE 2016 IEEE TRANSACTIONS ON COMMUNICATIONS Vol.64 No.9

<P>Underwater environment monitoring is an important application of wireless sensor networks (WSNs). However, WSNs face challenges, such as erroneous communication, ensuring the lifetime and robustness of the network, and cost constraints. The underwater acoustic channel (UAC) is highly frequency-selective, and the channel response changes over time because of variations in the channel conditions. Therefore, designing a cooperative coded orthogonal frequency division multiplexing (COFDM) system that is suitable for the doubly selective UAC and has reduced power consumption is very challenging. We propose a cooperative spatial-domain coding scheme combined with the low-density parity-check-coded OFDM system, called spatially concatenated channel-network code, for underwater acoustic WSNs. The designed underwater acoustic WSN exhibits a significant advantage regarding the required number of sensors, bit error rate (BER), and power consumption over the non-cooperative COFDM communication system. We also analyze sensor deployment schemes and find out the area in which our proposed scheme can be beneficial in terms of reduced power consumption and enhanced BER.</P>

MALDI-MS: A Powerful but Underutilized Mass Spectrometric Technique for Exosome Research

Iqbal Jalaludin,David M. Lubman,김정권 사단법인 한국질량분석학회 2021 Mass spectrometry letters Vol.12 No.3

Exosomes have gained the attention of the scientific community because of their role in facilitating intercellular communi- cation, which is critical in disease monitoring and drug delivery research. Exosome research has grown significantly in recent decades, with a focus on the development of various technologies for isolating and characterizing exosomes. Among these efforts is the use of matrix-assisted laser desorption ionization (MALDI) mass spectrometry (MS), which offers high-throughput direct analysis while also being cost and time effective. MALDI is used less frequently in exosome research than electrospray ionization due to the diverse popu- lation of extracellular vesicles and the impurity of isolated products, both of which necessitate chromatographic separation prior to MS analysis. However, MALDI-MS is a more appropriate instrument for the analytical approach to patient therapy, given it allows for fast and label-free analysis. There is a huge drive to explore MALDI-MS in exosome research because the technology holds great potential, most notably in biomarker discovery. With methods such as fingerprint analysis, OMICs profiling, and statistical analysis, the search for biomarkers could be much more efficient. In this review, we highlight the potential of MALDI-MS as a tool for investigating exo- somes and some of the possible strategies that can be implemented based on prior research.

Analysis and design of coding and interleaving in a MIMO-OFDM communication system

Iqbal, Zafar,Nooshabadi, S.,Heung-No Lee IEEE 2012 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS - Vol.58 No.3

<P>Use of Wireless communications for Metropolitan Area Network (MAN) in consumer electronics has increased significantly in the recent past. This paper, presents the performance analysis of four different channel coding and interleaving schemes for MIMO-OFDM communications systems. A comparison is done based on the BER, hardware implementation resources requirement, and power dissipation. It also presents a memory-efficient and low-latency interleaver implementation technique for the MIMO-OFDM communication system. It is shown that among the four coding and interleaving schemes studied, the cross-antenna coding and per-antenna interleaving performs the best under all SNR conditions and for all modulation schemes. It is also the best scheme as far as the hardware resource implication and power dissipation are concerned, which are particularly important in the context of consumer electronics. Next, using the proposed interleaver, a MIMO-OFDM based transmitter employing a double data stream 2×2 MIMO spatial multiplexing system is built.</P>