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.

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.

Graphene Oxide–Phosphor Hybrid Nanoscrolls with High Luminescent Quantum Yield: Synthesis, Structural, and X-ray Absorption Studies

Rani, Janardhanan R.,Oh, Se-I,Woo, Jeong Min,Tarwal, Nilesh L.,Kim, Hyun-Woong,Mun, Bongjin Simon,Lee, Sungbae,Kim, Ki-Jeong,Jang, Jae-Hyung American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.10

<P>Highly luminescent graphene oxide (GO)-phosphor hybrid thin films with a maximum quantum yield of 9.6% were synthesized Via a simple chemical method. An intense luminescence emission peak at 537 nm and a broad emission peak at 400 nm were observed from the GO-phosphor hybrid films. The maximum quantum yield of the emissions from the hybrid films was found to be 9.6%, which is 48 times higher than that of pristine GO films. The GO-phosphor hybrids were prepared via spin-coating and subsequent postannealing of the films, resulting in scrolling of the GO sheets. The resulting GO nanoscrolls exhibited a length of similar to 2 mu m with nanoscale interior cavities. Transmission electron microscopy and selected-area electron diffraction analyses revealed that the lattice structure of the tubular scrolls is similar to that of carbon nanotubes. While pristine GO films are p-type, in the GO-phosphor hybrids, the Fermi level shifted upward and fell between the HOMO-LUMO gap due to phosphor attachment via C-N bonding. The highly luminescent GO-phosphor hybrids will find important applications in graphene-based optoelectronic devices.</P>

Behavioural Determinants for Obesity: A Cross-sectional Study Among Urban Adolescents in India

Rani, M. Anitha,Sathiyasekaran, B.W.C. The Korean Society for Preventive Medicine 2013 예방의학회지 Vol.46 No.4

Objectives: To measure the prevalence of behavioural risk factors for obesity among urban adolescent school children in Chennai, India. Methods: This study was performed as a cross-sectional study using a World Health Organization-designed Global School-based Student Health Survey questionnaire (modified for India) among adolescent school children studying in 30 randomly selected secondary and higher secondary schools in Chennai city. 1842 adolescents studying in the VIII to XII standards were randomly selected for the study. Results: In the present study, 40.7% of the students ate fruit one or more times per day and 74.5% of the students ate vegetables one or more times per day. Nearly 20% of the students ate fast food items on 4 to 7 days during the previous week. Among the students, 30.4% watched television for more than two hours per day. Nearly 68% of the girls and 22% of the boys did not participate in outdoor sports activities. When the pattern of physical activity of the students was assessed, it was observed that 15.6% were inactive, 43.4% were minimally active, and the remaining 41.0% belonged to the category of health enhancing physical activity. Among the students, 6.2% were overweight and 5.2% were obese. Conclusions: The prevalence of risk factors for obesity was quite high among the adolescents. This study also showed that a great proportion of overweight/obese adolescents had a correct perception of their body weight and they were making efforts to modify risk factors such as television viewing, computer use, a sedentary lifestyle, and unhealthy dietary habits.

Genomic potential of Marinobacter salinus Hb8^T as sulfur oxidizing and aromatic hydrocarbon degrading bacterium

Rani, S.,Jeon, W.J.,Koh, H.W.,Kim, Y.E.,Kang, M.S.,Park, S.J. Elsevier Science B.V. Amsterdam 2017 MARINE GENOMICS Vol.34 No.-

Marinobacter salinus Hb8<SUP>T</SUP> was isolated from a tidal flat and its complete genome sequence was obtained using the PacBio RS II platform. The length and G+C content of the complete circular chromosome were about 4.12Mbp and 55.9%, respectively. Genomic analysis showed the strain has degradation capabilities for urea, aromatic and reduced sulfur compounds. These results reveal its potential application in biotechnology. Finally, the genome sequence of M. salinus Hb8<SUP>T</SUP> provides the fundamental genomic information for future studies.

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.

Graphene Oxide-Oxynitride Hybrid Nanoscrolls for Supercapacitor Electrodes with Enhanced Specific Capacitance

Rani, J. R.,Oh, Se-I,Woo, Jeong Min,Jang, Jae-Hyung The Electrochemical Society 2016 Journal of the Electrochemical Society Vol.163 No.5

<P>Graphene oxide-oxynitride hybrid nanoscrolls (GOXNs) were synthesized by embedding oxynitride molecules onto the graphene oxide (GO) sheets through a simple solution-based reduction of GO. The synthesized GOXNs exhibit good structural stability and high specific capacitance when they are used as supercapacitor electrodes. All the films were prepared via spin coating, and the post deposition annealing of the films transformed GO sheets into nanoscrolls. X-ray photoelectron spectroscopy (XPS) analyses of the hybrid film reveal that GO sheets are transformed to nanoscrolls by C-N bonding and various nitrogen based functional groups are attached to the GO sheets. The electrochemical performance of GOXNs is much better than that of pristine GO. The high specific capacitance and energy density of 260 F/g and 36.2 Wh/kg, respectively, were exhibited by GOXNs, whereas the pristine GO exhibited specific capacitance and energy density of 215 F/g and 29.86 Wh/kg, respectively, at a current density of 2 A/g. The GOXNs show good cyclic stability for more than 2000 cycles at a current density of 5 A/g. The observed high specific capacitance of GOXNs is due to the pseudo-capacitive contribution of the nitrogen functional groups along with quinone oxygen (residual oxygen functional groups) that accelerates the faradaic reactions and facilitates faster wetting. The results suggest that GOXNs are a promising electrode material for supercapacitors and batteries. (C) 2016 The Electrochemical Society. All rights reserved.</P>

Effects of high glucose with or without other metabolic substrates on alpha-adrenergic contractions in rat mesenteric and femoral arteries

Rany Vorn Hae Young Yoo 대한생리학회-대한약리학회 2017 The Korean Journal of Physiology & Pharmacology Vol.21 No.1

Hyperglycemia is associated with an increased risk of cardiovascular diseases. It has been demonstrated that chronic exposure to high glucose impaired endothelial functions. However, specific effects of short-term exposure to high glucose on vascular reactivity are controversial. Moreover, the combined effects of other metabolic substrates such as free fatty acids (FFA) on vascular reactivity remain poorly understood. Here we investigate the effects of short-term exposure to high glucose with or without other metabolic substrates including FFAs termed “nutrition full” (NF) solution, on mesenteric (MA) and deep femoral arteries (DFA) of rats. Arterial ring segments were mounted in a double-wire myograph. Contraction in response to phenylephrine (PhE) was determined in control (5 mM) and high glucose (23 mM, HG) environments over a 30 min period. In both arteries, PhE-inducedvasocontraction was enhanced by pre-incubation of HG solution. A combined incubation with HG and palmitic acid (100 mM) induced similar sensitization of PhE-contractions in both arteries. In contrast, high K⁺-induced contractions were not affected by HG. Interestingly, pre-incubation with NF solution decreased PhE-induced contraction in MA but increased the contraction in DFA. In NF solution, the HG-induced facilitation of PhE-contraction was not observed in MA. Furthermore, the PhE-induced contraction of DFA was attenuated by HG in NF solution. Our results demonstrate that the sensitization of PhE-induced arterial contraction by HG is differentially affected by other metabolic substrates. The conversation of skeletal arterial contractility by HG in NF solution requires careful interpretation of the previous in vitro studies where only glucose is included in physiological salt solutions. Further studies are required to elucidate the mechanism underlying the inconsistent effect of NF solution on MA and DFA.