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THERA: Two-level Hierarchical Hybrid Road-Aware Routing for Vehicular Networks
( Muhammad Tahir Abbas ),( Wang-cheol Song ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.7
There are various research challenges in vehicular ad hoc networks (VANETs) that need to be focused until an extensive deployment of it becomes conceivable. Design and development of a scalable routing algorithm for VANETs is one of the critical issue due to frequent path disruptions caused by the vehicle’s mobility. This study aims to provide a novel road-aware routing protocol for vehicular networks named as Two-level hierarchical Hybrid Road-Aware (THERA) routing for vehicular ad hoc networks. The proposed protocol is designed explicitly for inter-vehicle communication. In THERA, roads are distributed into non-overlapping road segments to reduce the routing overhead. Unlike other protocols, discovery process does not flood the network with packet broadcasts. Instead, THERA uses the concept of Gateway Vehicles (GV) for the discovery process. In addition, a route between source and destination is flexible to changing topology, as THERA only requires road segment ID and destination ID for the communication. Furthermore, Road-Aware routing reduces the traffic congestion, bypasses the single point of failure, and facilitates the network management. Finally yet importantly, this paper also proposes a probabilistical model to estimate a path duration for each road segment using the highway mobility model. The flexibility of the proposed protocol is evaluated by performing extensive simulations in NS3. We have used SUMO simulator to generate real time vehicular traffic on the roads of Gangnam, South Korea. Comparative analysis of the results confirm that routing overhead for maintaining the network topology is smaller than few previously proposed routing algorithms.
Muhammad Ajaz Hussain,Khawar Abbas,Muhammad Sher,Muhammad Nawaz Tahir,Wolfgang Tremel,Mohammad Saeed Iqbal,Muhammad Amin,Munair Badshah 한국고분자학회 2011 Macromolecular Research Vol.19 No.12
This article presents the synthesis of novel hydroxypropylmethylcellulose (HPMC)-aspirin (ASP) conjugates,i.e. macromolecular prodrugs, through the reaction of HPMC with ASP after its in situ activation by 4-methylbenzenesulfonyl chloride. The highly pure ASP prodrugs obtained by this homogeneous and elegant esterification method were characterized using different spectroscopic and chromatographic techniques. Nanoparticulate drug design was successfully achieved by the conversion of free hydroxyls of the polymer into acetates. Transmission electron microscopy and scanning electron microscopy showed nanoparticle formation with the major population size distribution of around 450 nm. Nevertheless, the pharmacokinetics of the HPMC conjugates were studied using high performance liquid chromatography. The pharmacokinetic data indicated that a single dose of 132.6 mg of HPMC-ASP was well tolerated in animal studies without any adverse effects. The maximum plasma concentration (C_max) of HPMC-ASP was found to be 14.6 μg·L^-1 with a t_max of 1 h. The plasma half-life and clearance and the volume of HPMC-ASP distribution were 4.6 h, 3.23 L·h^-1, and 21.8 L·kg^-1, respectively. The elimination of HPMC-ASP followed first-order kinetics with r^2 of 0.9643. The results presented in this paper show the great potential of HPMCASP as a more effective, safe, and stable prodrug.
Muhammad Hayat,Nadeem Raza,Umair Jamal,Suryyia Manzoor,Naseem Abbas,Muhammad Imran Khan,Jechan Lee,Richard J. C. Brown,김기현 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
As a key member of benzoylurea insecticides, lufenuron exhibits a strong potential for bioaccumulationin ecosystems. Here, we report the synthesis of a molecularly imprinted polymer (MIP) and its applicationfor selective extraction of lufenuron from agricultural runoff samples. The morphology and thermalstability of the prepared MIP was characterized by SEM and TGA, respectively. The experimental conditionsfor lufenuron detection were optimized through batch binding assay and response surface methodology(RSM). The MIP showcased a two-fold enhancement in binding capacity of lufenuron (74 mg g1)relative to non-imprinted polymer (36 mg g1), when measured through batch binding assay. Using aRSM based on central composite design, the qe value was predicted as 73.6 mg g1 under optimal experimentalconditions (e.g., pH 8). Furthermore, the percentage recovery of lufenuron was estimated as98.8 ± 1.8% (n = 9). The adsorption kinetics of the MIP followed the pseudo-first-order model with v2value of 0.004 (correlation coefficient of 0.99). The limit of detection for lufenuron using MIP-basedmethod was 3 106 mg mL1. There was no significant decrease in the performance of MIP against lufenuronover five successive cycles.
Abbas, Muhammad A.,Kim, Tea-Yon,Lee, Sang Uck,Kang, Yong Soo,Bang, Jin Ho American Chemical Society 2016 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.138 No.1
<P>Gold nanodusters (Au NCs) with molecule-like behavior have emerged as a new light harvester in various energy conversion systems. Despite several important strides made recently, efforts toward the utilization of NCs as a light harvester have been primarily restricted to proving their potency and feasibility. In solar cell applications, ground-breaking research with a power conversion efficiency (PCE) of more than 2% has recently been reported. Because of the lack of complete characterization of metal cluster-sensitized solar cells (MCSSCs), however, comprehensive understanding of the interfacial events and limiting factors which dictate their performance remains elusive. In this regard, we provide deep insight into MCSSCs for the first time by performing in-depth electrochemical impedance spectroscopy (EIS) analysis combined with physical characterization and density functional theory (DFT) calculations of Au NCs. In particular, we focused on the effect of the size of the Au NCs and electrolytes on the performance of MCSSCs and reveal that they are significantly influential on important solar cell characteristics such as the light absorption capability, charge injection kinetics, interfacial charge recombination, and charge transport. Besides offering comprehensive insights, this work represents an important stepping stone toward the development of MCSSCs by accomplishing a new PCE record of 3.8%.</P>
Predicting the Financial Behavior of the Religious Organization Board in Indonesia
ABBAS, Djamila,ALI, Muhammad,NOHONG, Mursalim,SOBARSYAH, Muhammad Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.12
The religious organization members have a unique take on the spiritual factors related to their daily life. The present study contributed to the lack of discussion investigating this particular pool of data's financial behavior. This article regressed several predictors of economic behavior, i.e., the locus of control, financial attitude, income, and religiosity, with 460 respondents. The results of the research are as follows: Financial attitude partially influences the financial behavior of Muhammadiyah committee members. Income partially influences the financial behavior of Muhammadiyah committee members. This research indicates that income is one of the factors that plays an essential role in determining the merits of improvement of the financial behavior of Muhammadiyah committee members. The higher the level of income received by Muhammadiyah members, the higher the desire to spend the money. Religiosity partially influences the financial behavior of the religious board of Muhammadiyah members in Indonesia. The higher the religiosity of Muhammadiyah committee members will encourage better financial management. Religiosity indicates how often individuals or Muhammadiyah members practice the religious sharia that they embrace. The findings of this study reveal that locus of control, financial attitude, income, and religiosity are the strong predictors of the board of the religious organization's financial behavior in Indonesia.