A social relationship-based energy efficient routing scheme for Opportunistic Internet of Things

Rani,Amita Malik 한국통신학회 2023 ICT Express Vol.9 No.4

Opportunistic Internet of Things (OppIoT) combines Opportunistic Networks and the Internet of Things to provide opportunistic communication between IoT devices and human-created communities in order to improve network connectivity, reliability, and longevity. This is significant because it introduces a new approach to connect and communicate smart devices in situations where there is no end-to-end connectivity. Due to the non-stable existence of connectivity between nodes, building a scalable, flexible, interoperable, and energy efficient routing protocol is a difficult issue. This study presents a new routing protocol for the Opportunistic Internet of Things called Social relationship based Energy Efficient Routing (SEER), which bases routing decisions on the forwarding feasibility degree, residual energy, and buffer capacity of nodes. SEER surpasses EBR and EDR in terms of delivery probability, hop count, and overhead ratio, according to simulation results utilizing the Opportunistic Network Environment (The ONE) simulator.

ID- Based Authentication for WiMAX

Pushpi Rani1,Brijesh Kumar Chaurasia,Geetam Singh Tomar 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.2

WiMAX is broadband wireless system being used for long range wireless networking, which makes this system vulnerable to security breaches. In this paperwe present authentication scheme using ID-based signature scheme for WiMAX, which offers a certificate-less public key verification. The proposed scheme has also increased message processing throughput as it has used elliptic curve cryptosystem, sigencryption and identity based cryptography.

Excess molar enthalpies of binary mixtures of formamide with butanol at 298.15 K: Application of Prigogine–Flory–Patterson theory and Treszczanowicz–Benson association model

Manju Rani,Sanjeev Maken,Shalu Agarwal,Priyanka Lahot 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5

Excess molar enthalpies (HEm ) of formamide (1) + 1-butanol or 2-methyl-1-propanol or 2-methyl-2-propanol (2) mixtures have been measured at 298.15 K over the entire composition range using flow micro calorimeter. The excess enthalpy data along with previously published excess volumes data (VEm )(M. Rani, S. Maken, J. Ind. Eng. Chem. 18 (2012) 1694) have been utilised to study the thermodynamics of molecular interactions in terms of Prigogine–Flory–Patterson theory and Treszczanowicz–Benson association model with a Flory contribution term. The Treszczanowicz–Benson model was developed for alkane + alkanol systems considering Mecke–Kempter type of association in alkanol. In this paper the Treszczanowicz–Benson association model was applied, for the first time, to binary mixtures containing both components associated (butanol and formamide) through hydrogen bonding. In both the cases,when either of formamide or butanol was assumed to be associated, the calculated HEm and VEm values compared reasonably well with the corresponding experimental data, but the agreement is not very impressive for excess enthalpy in formamide + 2-methyl-2-propanol mixtures. Extent of inter-molecular H-bonding in formamide and butanols in their binary mixtures was also reflected in their molar enthalpy of association of H-bonding Dh0H.

Evaluation of anti-diabetic activity of glycyrrhizin-loaded nanoparticles in nicotinamide-streptozotocin-induced diabetic rats

Rani, Ruma,Dahiya, Shakti,Dhingra, Dinesh,Dilbaghi, Neeraj,Kim, Ki-Hyun,Kumar, Sandeep Elsevier 2017 European journal of pharmaceutical sciences Vol.106 No.-

<P><B>Abstract</B></P> <P>Glycyrrhizin is an active constituent of the roots and rhizomes of <I>Glycyrrhiza glabra</I> and has anti-hyperglycemic effects. In this study, nanoparticles (NPs) loaded with glycyrrhizin or metformin were evaluated <I>in vivo</I> for their anti-hyperglycemic potency towards type-II diabetes in rats. The NPs were produced <I>via</I> the ionotropic gelation method using the biocompatible polymers chitosan and gum arabic. The polymer concentration was optimized using the 3<SUP>2</SUP> factorial method to acquire both minimum particle size and maximum encapsulation efficiency. The NPs were then characterized with respect to particle size, encapsulation efficiency, stability, chemical interactions, and <I>in vitro</I> drug dissolution profiles using spectroscopic and microscopic analysis. Furthermore, glycyrrhizin and metformin and their nanoformulations were administered for 21 successive days to diabetic rats. Glycyrrhizin-loaded NPs had significant anti-diabetic effects even though they contained approximately one quarter of the dosage relative to the pure form.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Qualitative Analysis of Additives in Plastic Marine Debris and Its New Products.

Rani, Manviri,Shim, Won Joon,Han, Gi Myung,Jang, Mi,Al-Odaini, Najat Ahmed,Song, Young Kyong,Hong, Sang Hee Springer-Verlag 2015 Archives of environmental contamination and toxico Vol.69 No.3

<P>Due to their formulation and/or processing, plastics contain additives and impurities that may leach out under conditions of use and accumulate in the environment. To evaluate their role as vectors of chemical contaminants in marine environment, plastic debris (n??=??19) collected from coastal beaches along with new plastics (n??=??25; same or same brand) bought from local markets were screened by gas chromatography-mass spectrometry in full scan mode. Detected peaks were identified using NIST library in different polymers (polypropylene (PP)??>??polyethylene (PE)??>??PP??+??PE??>??polyethyl terephthalate??>??poly(acylene:styrene) with different use (food, fishery, and general use). A database on the presence of 231 different chemicals were grouped into hydrocarbons, ultra-violet (UV)-stabilizers, antioxidants, plasticizers, lubricants, intermediates, compounds for dyes and inks, flame retardants, etc. The UV326, UV327, UV328, UV320, UvinualMC80, irganox 1076, DEHP, antioxidant no 33, di-n-octylisophthalate, diisooctyl phthalate, hexanoic acid 2-ethyl-hexadecyl ester, and hydrocarbons were most frequently detected. Finding of toxic phthalates and UV stabilizers in those products having moisture contact (like bottles with short use) raised concern to humans and indicated their irregular use. The comparison between new and debris plastics clearly indicated the leaching and absorption of chemicals and supports our assumption of plastic as media for transferring these additives in marine environment.</P>

Releasing of hexabromocyclododecanes from expanded polystyrenes in seawater -field and laboratory experiments

Rani, Manviri,Shim, Won Joon,Jang, Mi,Han, Gi Myung,Hong, Sang Hee Pergamon Press 2017 Chemosphere Vol.185 No.-

<P><B>Abstract</B></P> <P>Expanded polystyrene (EPS) is a major component of marine debris globally. Recently, hazardous hexabromocyclododecanes (HBCDDs) were detected in EPS buoys used for aquaculture farming. Subsequently, enrichment of HBCDDs was found in nearby marine sediments and mussels growing on EPS buoys. It was suspected that EPS buoys and their debris might be sources of HBCDDs. To confirm this, the release of HBCDDs from EPS spherules detached from a buoy to seawater was investigated under field (open sea surface and closed outdoor chambers with sun exposure and in the dark) and laboratory (particle-size) conditions. In all exposure groups, initial rapid leaching of HBCDDs was followed by slow desorption over time. Abundant release of HBCDDs was observed from EPS spherules exposed to the open sea surface (natural) and on exposure to sunlight irradiation or in the dark in controlled saline water. Water leaching and UV-light/temperature along with possibly biodegradation were responsible for about 37% and 12% of HBCDDs flux, respectively. Crumbled EPS particles (≤1 mm) in samples deployed on the sea surface for 6 months showed a high degree of weathering. This implies that surface erosion and further fragmentation of EPS via environmental weathering could enhance the leaching of HBCDDs from the surface of EPS. Overall, in the marine environment, HBCDDs could be released to a great extent from EPS products and their debris due to the cumulative effects of the movement of large volumes of water (dilution), biodegradation, UV-light/temperature, wave action (shaking), salinity and further fragmentation of EPS spherules.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Field and laboratory observations for leaching of HBCDDs from EPS into seawater. </LI> <LI> EPS debris/small fragments as source of hazardous chemicals in marine environment. </LI> <LI> Rapid initial leaching of HBCDDs from EPS fragments is followed by slow desorption. </LI> <LI> Water leaching, UV-light/temperature and fragmentation enhanced the release of HBCDD. </LI> </UL> </P>

${\pi}G{\alpha}$-LOCALLY CLOSED SETS AND ${\pi}G{\alpha}$-LOCALLY CONTINUOUS FUNCTIONS

Rani, I. Arockia,Balachandran, K.,Janaki, C. The Youngnam Mathematical Society Korea 2008 East Asian mathematical journal Vol.24 No.4

In this paper we introduce ${\pi}G{\alpha}$-LC sets, ${\pi}G{\alpha}-LC^*$ sets and ${\pi}G{\alpha}-LC^{**}$ sets and different notions of generalizations of continuous functions in topological space and discuss some of their properties. Further we prove pasting lemma for ${\pi}G{\alpha}-LC^{**}$ continuous functions and ${\pi}G{\alpha}-LC^{**}$ irresolute functions.

Controlling the luminescence emission from palladium grafted graphene oxide thin films via reduction.

Rani, J R,Oh, Juyeong,Park, Ji-Eun,Lim, Juhwan,Park, Byeongho,Kim, Kyung,Kim, Sung-Jin,Chan Jun, Seong RSC Pub 2013 Nanoscale Vol.5 No.12

<P>The role of palladium (Pd) in the reduction of graphene oxide (GO) thin films was investigated using a Pd assisted grafting technique. The structural and optical characteristics of these thin films were obtained from various spectroscopic analyses, which confirmed increased C[double bond, length as m-dash]C-C aromatic ring vibration and oxidation of Pd with Ar annealing. In Pd free GO, annealing of films resulted in restoration of sp(2) clusters; however, Pd grafting with non-annealed film enhanced the possibility of restoration and further annealing dramatically increased the restoration rate with enhanced blue photoluminescence (PL) emission. The blue PL emission originates from sp(2) cluster sites and the yellow-green PL from defect trapped states. As reduction of GO increased, yellow-green emission decreased and blue PL became the prominent emission. These experimental findings open up a new feasible pathway for controlling the luminescence emission from graphene oxide that furthers the technological advancement of graphene based optoelectronic devices.</P>

Development of Functional Jackets Considering the Working Posture of Rebar Workers

( Rani Eom ),( Yejin Lee ) 한국감성과학회 2021 한국감성과학회 국제학술대회(ICES) Vol.2021 No.-

This study was a functional jacket was manufactured by designing work clothes considering the working postures of rebar workers. As a result of developing stretchy jacket with a large pattern area, it was a suitable for rebar workers.

Photoluminescence characterizations in phase transition alumina with boehmite nanostructures

Rani Geeta 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.6

The phase transition alumina γ, ẟ, θ, α with boehmite nanostructure have been prepared, and a relative study between the crystal structure, annealing temperature, and photoluminescence properties are reported in this paper. The eff ects of diff er- ent temperatures up to 1600 on the boehmite nanostructure revealed diff erent phases of alumina which are characterized using X-ray diff raction (XRD) technique. The evolution of crystal micrographs and grain size during the transformation are studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The emission spectra of the obtained samples are investigated using photoluminescence (PL) spectroscopy in which the traces of inherent impuri- ties of Cr 3+ are detected in the α-Al 2 O 3 without any doping. The XRD and SEM/TEM analysis show that with increasing temperature, the transformation of boehmite into a well-crystallized α-Al 2 O 3 and the micrographs from nanoplatelets with spindle-like edges to vermicular structure take place. Thus, this paper reports an important role of temperature in the phase transition, morphologies, and in the photoluminescence properties of the obtained samples. The optical properties investi- gate the defects associated with each phase of alumina in the transition alumina material system. The considerable sign of the crystal phase found that the emission band spectra of the corresponding phase vary greatly due to the presence of traces of uncontrolled impurity like Cr 3+ found in the sample. The most prominent peak corresponding to the ruby laser has been found due to these Cr 3+ ions in the most stable phase, α-Al 2 O 3 which is the final product.