Interference management in OFDMA femtocell networks: issues and approaches

Saquib, N.,Hossain, E.,Long Bao Le,Dong In Kim IEEE 2012 IEEE wireless communications Vol.19 No.3

<P>One of the effective techniques of improving the coverage and enhancing the capacity and data rate in cellular wireless networks is to reduce the cell size (i.e., cell splitting) and transmission distances. Therefore, the concept of deploying femtocells over macrocell has recently attracted growing interests in academia, industry, and standardization forums. Various technical challenges towards mass deployment of femtocells have been addressed in recent literature. Interference mitigation between neighboring femtocells and between the femtocell and macrocell is considered to be one of the major challenges in femtocell networks because femtocells share the same licensed frequency spectrum with macrocell. Further, the conventional radio resource management techniques for hierarchical cellular system is not suitable for femtocell networks since the positions of the femtocells are random depending on the users' service requirement. In this article, we provide a survey of the different state-of-the-art approaches for interference and resource management in orthogonal frequency-division multiple access (OFDMA)-based femtocell networks. A qualitative comparison among the different approaches is provided. To this end, open challenges in designing interference management schemes for OFDMA femtocell networks are discussed.</P>

Directional Random Access Technique for Millimeter-Wave Cellular Systems with Multiple Antenna Arrays

Saquib, Khan Mohammed,Arana, Jasper Meynard,Cho, Yong Soo AMERICAN SCIENTIFIC PUBLISHERS 2017 Journal of nanoelectronics and optoelectronics Vol.12 No.9

Fractional frequency reuse for interference management in LTE-advanced hetnets

Saquib, N.,Hossain, E.,Dong In Kim IEEE 2013 IEEE wireless communications Vol.20 No.2

<P>Improvement of cell coverage and network capacity are two major challenges for the evolving 4G cellular wireless communication networks such as LTE-Advanced networks. In this context, hierarchical layering of cells with macro base stations coexisting with low-power and shortrange base stations (corresponding to picocells or femtocells) in a service area is considered to be an efficient solution to enhance the spectral efficiency of the network per unit area. Also, such a hierarchical cell deployment, which is referred to as a heterogeneous network, or Het- Net, provides significant improvement in the coverage of indoor and cell edge users and ensures better QoS to the users. Interference mitigation between different layers is one of the key issues that needs to be resolved for successful deployment of HetNets. To this end, fast frequency response, FFR, is considered to be an efficient intercell interference coordination technique for OFDMA-based HetNets. This article focuses on evaluating three state-of-the-art FFR deployment schemes: strict FFR, soft FFR, and FFR-3 schemes for OFDMA-based two-tier HetNets comprising macrocells overlaid with femtocells. Also, a variation of the FFR-3 scheme, which is referred to as the optimal static FFR (OSFFR) scheme, is proposed. A broad comparison among all these FFR schemes is performed by using Monte Carlo simulations considering performance metrics such as outage probability, average network sum rate, and spectral efficiency. Simulation results show that, the average gains in spectral efficiency (b/s/Hz) of the network are significantly higher for the proposed scheme when compared to the strict FFR, soft FFR, and FFR-3 schemes.</P>

Enhancing consumer satisfaction and retail patronage through brand experience, cognitive pleasure, and shopping enjoyment: A comparison between lifestyle and product-centric displays

Ahmad Saquib Sina,Hye-Young Kim 한국마케팅과학회 2019 Journal of Global Fashion Marketing Vol.10 No.2

Despite the importance of retail atmospherics documented in the literature, little empirical research has been done on the issue of what specific aspects of retail atmospherics can enhance experiential marketing. As an attempt to address this research void, the primary purpose of this study is to compare the effect of product display (lifestyle vs. product-centric) on consumer satisfaction and retail patronage intentions. In so doing, this study examines the mediating role of hedonic shopping experiences operationalized through three separate sub-dimensions (i.e. brand experience, shopping enjoyment, and cognitive pleasure) while controlling a brand effect (i.e. testing two types of product display in a single brand context). The results showed that the lifestyle display creates higher brand experience, shopping enjoyment, cognitive pleasure, satisfaction, time spent, and patronage intentions compared to the product-centric display. This study provides empirical evidence supporting the importance of experiential marketing. The implications of fashion retailing are discussed, as well as limitations and areas for future research.

Voiceprint Recognition Systems for Remote Authentication-A Survey

Zia Saquib,Nirmala Salam,Rekha Nair,Nipun Pandey 보안공학연구지원센터 2011 International Journal of Hybrid Information Techno Vol.4 No.2

ENHANCING CONSUMER SATISFACTION AND RETAIL PATRONAGE THROUGH BRAND EXPERIENCE, COGNITIVE PLEASURE, AND SHOPPING ENJOYMENT: A COMPARISON BETWEEN LIFESTYLE AND PRODUCT-CENTRIC DISPLAYS

Ahmad Saquib Sina,Hye-Young Kim 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07

Despite the importance of retail atmospherics documented in the literature, little empirical research has been done on the issue of what specific aspects of retail atmospherics can enhance experiential marketing. Therefore, the primary purpose of this study is to compare the effect of product display (lifestyle vs. product-centric) on consumer satisfaction and retail patronage intentions. In so doing, this study examines the mediating role of hedonic shopping experiences operationalized through 3 separate subdimensions (i.e., brand experience, shopping enjoyment, and cognitive pleasure) while controlling a brand effect (i.e., testing two types of product display in a single brand context). Demminga et al. (2012) state that lifestyle display is a cross-merchandised, integrated, aesthetically attractive theme or scene through which consumers could envisage themselves in the scene or nature. On the other hand, product-centric display does not necessarily present a coherent theme. Instead, this type of product display is frequently used in a traditional retail format focuses on merchandise presentation appealing to target customers (Foster and Mclelland, 2015). This study was conducted using two product display stimuli: lifestyle and product-centric displays in the context of a specialty apparel store, Anthropologie. One image of Anthropologie was selected as a lifestyle display because it contained a thematic prop, which illustrates a natural scenario in that store. The results showed that the lifestyle display creates higher brand experience, shopping enjoyment, cognitive pleasure, satisfaction, time spent, and patronage intentions compared to the product centric display. This study provides empirical evidence supporting the importance of experiential marketing. Theoretically, this study demonstrates that lifestyle display could be applied in an apparel store. Rather than focusing only on products retailers could easily develop thematic props in a store because they are easy to set up, cost-effective, and less time-consuming. By setting up a lifestyle display, retailers could easily differentiate their brands from other competing brands.

ZEITLUPE Contributes to a Thermoresponsive Protein Quality Control System in Arabidopsis

Gil, Kyung-Eun,Kim, Woe-Yeon,Lee, Hyo-Jun,Faisal, Mohammad,Saquib, Quaiser,Alatar, Abdulrahman A.,Park, Chung-Mo Americ 2017 The Plant cell Vol.29 No.11

<P>The E3 ligase ZEITLUPE mediates the clearance of denatured protein aggregates under heat stress conditions, thereby enhancing thermotolerance and the thermal stability of the circadian clock.</P><P>Cellular proteins undergo denaturation and oxidative damage under heat stress, forming insoluble aggregates that are toxic to cells. Plants possess versatile mechanisms to deal with insoluble protein aggregates. Denatured proteins are either renatured to their native conformations or removed from cellular compartments; these processes are often referred to as protein quality control. Heat shock proteins (HSPs) act as molecular chaperones that assist in the renaturation-degradation process. However, how protein aggregates are cleared from cells in plants is largely unknown. Here, we demonstrate that heat-induced protein aggregates are removed by a protein quality control system that includes the ZEITLUPE (ZTL) E3 ubiquitin ligase, a central circadian clock component in <I>Arabidopsis thaliana</I>. ZTL mediates the polyubiquitination of aggregated proteins, which leads to proteasomal degradation and enhances the thermotolerance of plants growing at high temperatures. The ZTL-defective <I>ztl-105</I> mutant exhibited reduced thermotolerance, which was accompanied by a decline in polyubiquitination but an increase in protein aggregate formation. ZTL and its interacting partner HSP90 were cofractionated with insoluble aggregates under heat stress, indicating that ZTL contributes to the thermoresponsive protein quality control machinery. Notably, the circadian clock was hypersensitive to heat in <I>ztl-105</I>. We propose that ZTL-mediated protein quality control contributes to the thermal stability of the circadian clock.</P>

CoO Thin Nanosheets Exhibit Higher Antimicrobial Activity Against Tested Gram-positive Bacteria Than Gram-negative Bacteria

( Shams Tabrez Khan ),( Rizwan Wahab ),( Javed Ahmad ),( Abdulaziz A. Al-khedhairy ),( Maqsood A. Siddiqui ),( Quaiser Saquib ),( Bahy A. Ali ),( Javed Musarrat ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.5

Envisaging the role of Co in theranautics and biomedicine it is immensely important to evaluate its antimicrobial activity. Hence in this study CoO thin nanosheets (CoO-TNs) were synthesized using wet chemical solution method at a very low refluxing temperature (90 oC) and short time (60 min). Scanning electron microscopy of the grown structure revealed microflowers (2~3 μm) composed of thin sheets petals (60~80 nm). The thickness of each individual grown sheet varies from 10~20 nm. Antimicrobial activities of CoO-TNs against two Gram positive bacteria (Micrococcus luteus, and Staphylococcus aureus), and two Gram negative bacteria (Escherichia coli and Pseudomonas aeruginosa) were determined. A 98% and 65% growth inhibition of M. luteus and S. aureus respectively, was observed with 500 μg/ml of CoO-TNs compared to 39 and 34% growth inhibition of E. coli and P. aeruginosa, respectively with the same concentration of CoO-TNs. Hence, synthesized CoO-TNs exhibited antimicrobial activity against Gram negative bacteria and an invariably higher activity against tested Gram positive bacteria. Therefore, synthesized CoO-TNs are less prone to microbial infections.