DEVELOPMENT OF AUTONOMOUS QoS BASED MULTICAST COMMUNICATION SYSTEM IN MANETS

Sarangi, Sanjaya Kumar,Panda, Mrutyunjaya International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.8

Multicast Routings is a big challenge due to limitations such as node power and bandwidth Mobile Ad-hoc Network (MANET). The path to be chosen from the source to the destination node requires protocols. Multicast protocols support group-oriented operations in a bandwidth-efficient way. While several protocols for multi-cast MANETs have been evolved, security remains a challenging problem. Consequently, MANET is required for high quality of service measures (QoS) such infrastructure and application to be identified. The goal of a MANETs QoS-aware protocol is to discover more optimal pathways between the network source/destination nodes and hence the QoS demands. It works by employing the optimization method to pick the route path with the emphasis on several QoS metrics. In this paper safe routing is guaranteed using the Secured Multicast Routing offered in MANET by utilizing the Ant Colony Optimization (ACO) technique to integrate the QOS-conscious route setup into the route selection. This implies that only the data transmission may select the way to meet the QoS limitations from source to destination. Furthermore, the track reliability is considered when selecting the best path between the source and destination nodes. For the optimization of the best path and its performance, the optimized algorithm called the micro artificial bee colony approach is chosen about the probabilistic ant routing technique.

Vascular tumors of the liver: A brief review

Sujata Sarangi,Balamurugan Thirunavukkarasu,Sudeep Khera,Selvakumar B,Taruna Yadav 한국간담췌외과학회 2023 Annals of hepato-biliary-pancreatic surgery Vol.27 No.4

Vascular tumors of the liver are mesenchymal lesions from endothelial cells. They range from common benign lesions such as haemangioma, intermediate tumors like Kaposi sarcoma, and perivascular epithelioid cell tumor to malignant tumors such as hepatic epithelioid hemangioendothelioma and hepatic angiosarcoma in adults. Pediatric vascular tumors of the liver also include benign, locally aggressive, borderline, and malignant masses with haemangiomas being the most common benign tumors and epithelioid hemangioendothelioma being an uncommon pediatric malignancy. The list of these lesions is completed by nodular regenerative hyperplasia, solitary fibrous tumour, and hepatic small vessel neoplasms (HSVN). Some of these tumors are uncommon and rare. This review article aimed to enumerate hepatic vascular tumors along with their imaging, histopathology, molecular findings for accurate diagnosis that can result in better management.

Two new species of the genus Sennertia (Acari: Chaetodactylidae) phoretic on Carpenter bees from west Bengal, India

Poulami Sarangi,Salil K. Gupta,Goutam K. Saha 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.1

Two new species of Sennertia Oudemans, 1905, Sennertia punctatus sp. nov. and Sennertia xylocopi sp. nov. whichare phoretic on Carpenter bees collected from West Bengal for the first time are illustrated and described.

Description of two new species of ectoparasitic mites of Podapolipus and Podapolipoides (Acari: Podapolipidae) on Oxya sp. from West Bengal, India

Poulami Sarangi,Himani Biswas,Salil K. Gupta,Goutam K. Saha 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol.15 No.1

Two new species, Podapolipus husbandi and Podapolipoides channabasavannai, collected on Oxya sp. from West Bengal, India are described and illustrated.

An Analytical Model for the Threshold Voltage of Short-Channel Double-Material-Gate (DMG) MOSFETs with a Strained-Silicon (s-Si) Channel on Silicon-Germanium (SiGe) Substrates

Bhushan, Shiv,Sarangi, Santunu,Gopi, Krishna Saramekala,Santra, Abirmoya,Dubey, Sarvesh,Tiwari, Pramod Kumar The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.4

In this paper, an analytical threshold voltage model is developed for a short-channel double-material-gate (DMG) strained-silicon (s-Si) on silicon-germanium ($Si_{1-X}Ge_X$) MOSFET structure. The proposed threshold voltage model is based on the so called virtual-cathode potential formulation. The virtual-cathode potential is taken as minimum channel potential along the transverse direction of the channel and is derived from two-dimensional (2D) potential distribution of channel region. The 2D channel potential is formulated by solving the 2D Poisson's equation with suitable boundary conditions in both the strained-Si layer and relaxed $Si_{1-X}Ge_X$ layer. The effects of a number of device parameters like the Ge mole fraction, Si film thickness and gate-length ratio have been considered on threshold voltage. Further, the drain induced barrier lowering (DIBL) has also been analyzed for gate-length ratio and amount of strain variations. The validity of the present 2D analytical model is verified with ATLAS$^{TM}$, a 2D device simulator from Silvaco Inc.

Comparative Study of Corner and Feature Extractors for Real-Time Object Recognition in Image Processing

Mohapatra, Arpita,Sarangi, Sunita,Patnaik, Srikanta,Sabut, Sukant The Korea Institute of Information and Commucation 2014 Journal of information and communication convergen Vol.12 No.4

Corner detection and feature extraction are essential aspects of computer vision problems such as object recognition and tracking. Feature detectors such as Scale Invariant Feature Transform (SIFT) yields high quality features but computationally intensive for use in real-time applications. The Features from Accelerated Segment Test (FAST) detector provides faster feature computation by extracting only corner information in recognising an object. In this paper we have analyzed the efficient object detection algorithms with respect to efficiency, quality and robustness by comparing characteristics of image detectors for corner detector and feature extractors. The simulated result shows that compared to conventional SIFT algorithm, the object recognition system based on the FAST corner detector yields increased speed and low performance degradation. The average time to find keypoints in SIFT method is about 0.116 seconds for extracting 2169 keypoints. Similarly the average time to find corner points was 0.651 seconds for detecting 1714 keypoints in FAST methods at threshold 30. Thus the FAST method detects corner points faster with better quality images for object recognition.

Synthesis, Structural, and Spectroscopic Characterization and Reactivities of Mononuclear Cobalt(III)−Peroxo Complexes

Cho, Jaeheung,Sarangi, Ritimukta,Kang, Hye Yeon,Lee, Jung Yoon,Kubo, Minoru,Ogura, Takashi,Solomon, Edward I.,Nam, Wonwoo American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.47

<P>Metal−dioxygen adducts are key intermediates detected in the catalytic cycles of dioxygen activation by metalloenzymes and biomimetic compounds. In this study, mononuclear cobalt(III)−peroxo complexes bearing tetraazamacrocyclic ligands, [Co(12-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP> and [Co(13-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP>, were synthesized by reacting [Co(12-TMC)(CH<SUB>3</SUB>CN)]<SUP>2+</SUP> and [Co(13-TMC)(CH<SUB>3</SUB>CN)]<SUP>2+</SUP>, respectively, with H<SUB>2</SUB>O<SUB>2</SUB> in the presence of triethylamine. The mononuclear cobalt(III)−peroxo intermediates were isolated and characterized by various spectroscopic techniques and X-ray crystallography, and the structural and spectroscopic characterization demonstrated unambiguously that the peroxo ligand is bound in a side-on η<SUP>2</SUP> fashion. The O−O bond stretching frequency of [Co(12-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP> and [Co(13-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP> was determined to be 902 cm<SUP>−1</SUP> by resonance Raman spectroscopy. The structural properties of the CoO<SUB>2</SUB> core in both complexes are nearly identical; the O−O bond distances of [Co(12-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP> and [Co(13-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP> were 1.4389(17) Å and 1.438(6) Å, respectively. The cobalt(III)−peroxo complexes showed reactivities in the oxidation of aldehydes and O<SUB>2</SUB>-transfer reactions. In the aldehyde oxidation reactions, the nucleophilic reactivity of the cobalt−peroxo complexes was significantly dependent on the ring size of the macrocyclic ligands, with the reactivity of [Co(13-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP> > [Co(12-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP>. In the O<SUB>2</SUB>-transfer reactions, the cobalt(III)−peroxo complexes transferred the bound peroxo group to a manganese(II) complex, affording the corresponding cobalt(II) and manganese(III)−peroxo complexes. The reactivity of the cobalt−peroxo complexes in O<SUB>2</SUB>-transfer was also significantly dependent on the ring size of tetraazamacrocycles, and the reactivity order in the O<SUB>2</SUB>-transfer reactions was the same as that observed in the aldehyde oxidation reactions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-47/ja107177m/production/images/medium/ja-2010-07177m_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja107177m'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja107177m'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja107177m'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja107177m'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja107177m'>ACS Electronic Supporting Info</A></P>

Geometric and electronic structure and reactivity of a mononuclear ‘side-on’ nickel(iii)–peroxo complex

Cho, Jaeheung,Sarangi, Ritimukta,Annaraj, Jamespandi,Kim, Sung Yeon,Kubo, Minoru,Ogura, Takashi,Solomon, Edward I.,Nam, Wonwoo Nature Publishing Group 2009 Nature chemistry Vol.1 No.7

Metal-dioxygen adducts, such as metal-superoxo and -peroxo species, are key intermediates often detected in the catalytic cycles of dioxygen activation by metalloenzymes and biomimetic compounds. The synthesis and spectroscopic characterization of an end-on nickel(II)-superoxo complex with a 14-membered macrocyclic ligand was reported previously. Here we report the isolation, spectroscopic characterization, and high-resolution crystal structure of a mononuclear side-on nickel(III)-peroxo complex with a 12-membered macrocyclic ligand, [Ni(12-TMC)(O<SUB>2</SUB>)]<SUP>+</SUP> (1) (12-TMC = 1,4,7,10-tetramethyl-1,4,7,10-tetraazacyclododecane). In contrast to the end-on nickel(II)-superoxo complex, the nickel(III)-peroxo complex is not reactive in electrophilic reactions, but is capable of conducting nucleophilic reactions. The nickel(III)-peroxo complex transfers the bound dioxygen to manganese(II) complexes, thus affording the corresponding nickel(II) and manganese(III)-peroxo complexes. Our results demonstrate the significance of supporting ligands in tuning the geometric and electronic structures and reactivities of metal–O<SUB>2</SUB> intermediates that have been shown to have biological as well as synthetic usefulness in biomimetic reactions.

Mononuclear Metal–O₂ Complexes Bearing Macrocyclic <i>N</i>-Tetramethylated Cyclam Ligands

Cho, Jaeheung,Sarangi, Ritimukta,Nam, Wonwoo American Chemical Society 2012 Accounts of chemical research Vol.45 No.8

<P>Metalloenzymes activate dioxygen to carry out a variety of biological reactions, including the biotransformation of naturally occurring molecules, oxidative metabolism of xenobiotics, and oxidative phosphorylation. The dioxygen activation at the catalytic sites of the enzymes occurs through several steps, such as the binding of O<SUB>2</SUB> at a reduced metal center, the generation of metal–superoxo and −peroxo species, and the O–O bond cleavage of metal–hydroperoxo complexes to form high-valent metal-oxo oxidants. Because these mononuclear metal–dioxygen (M–O<SUB>2</SUB>) adducts are implicated as key intermediates in dioxygen activation reactions catalyzed by metalloenzymes, studies of the structural and spectroscopic properties and reactivities of synthetic biomimetic analogues of these species have aided our understanding of their biological chemistry. One particularly versatile class of biomimetic coordination complexes for studying dioxygen activation by metal complexes is M–O<SUB>2</SUB> complexes bearing the macrocyclic <I>N</I>-tetramethylated cyclam (TMC) ligand.</P><P>This Account describes the synthesis, structural and spectroscopic characterization, and reactivity studies of M–O<SUB>2</SUB> complexes bearing tetraazamacrocyclic <I>n</I>-TMC ligands, where M  Cr, Mn, Fe, Co, and Ni and <I>n</I> = 12, 13, and 14, based on recent results from our laboratory. We have used various spectroscopic techniques, including resonance Raman and X-ray absorption spectroscopy, and density functional theory (DFT) calculations to characterize several novel metal–O<SUB>2</SUB> complexes. Notably, X-ray crystal structures had shown that these complexes are end-on metal-superoxo and side-on metal-peroxo species. The metal ions and the ring size of the macrocyclic TMC ligands control the geometric and electronic structures of the metal–O<SUB>2</SUB> complexes, resulting in the end-on metal–superoxo versus side-on metal–peroxo structures. Reactivity studies performed with the isolated metal-superoxo complexes reveal that they can conduct electrophilic reactions such as oxygen atom transfer and C–H bond activation of organic substrates. The metal–peroxo complexes are active oxidants in nucleophilic reactions, such as aldehyde deformylation. We also demonstrate a complete intermolecular O<SUB>2</SUB>-transfer from metal(III)–peroxo complexes to a Mn(II) complex. The results presented in this Account show the significance of metal ions and supporting ligands in tuning the geometric and electronic structures and reactivities of the metal–O<SUB>2</SUB> intermediates that are relevant in biology and in biomimetic reactions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/achre4/2012/achre4.2012.45.issue-8/ar3000019/production/images/medium/ar-2012-000019_0016.gif'></P>

Application of Debye–Huckel and Bronsted-Bjerrum theory to mass transfer rate in supported liquid membrane; effect of ionic strength on separation factor, an analysis through case studies

Swain Basudev,Sarangi Kadambini,Park Jay Ryang,Lee Chan Gi 한국자원공학회 2022 Geosystem engineering Vol.25 No.6

The Debye–Huckel and Bronsted-Bjerrum theory has been applied to supported liquid membrane process to understand the effect of ionic strength on separation factor. The effect of ionic strength due to different salts and their concentration on the separation factor of Cu(II) and Zn(II) by supported liquid membrane using Di-2 ethyl-hexyl phosphoric acid (D2EHPA) as a mobile carrier has been studied. For those studies, different salts, i.e., NaCl, NaNO3, NaClO3, Na2SO4, and CH3COONa, have been used. A mathematical model for the dependency of separation factor of Cu(II) and Zn(II) on ionic strength considering Debye–Huckel theory and Bronsted–Bjerrum theory has been developed. Experiments were carried out using a batch-type permeator of micro-porous polypropylene thin sheet as the solid support for the liquid membrane in the presence of different ionic strength of anions. The calculated separation factor is well agreed with the obtained results within 95% confidence interval.