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M. Vijay Sekhar Babu,N. Ashokkumar,Anjali Joshi,Pallavi Sagar Deshpande,Ismail Keshta,Renato R. Maaliw III 대한공간정보학회 2024 Spatial Information Research Vol.32 No.2
The Publisher has retracted this article in agreement with the Editor-in-Chief. The article was submitted to be part of a guest-edited issue. An investigation by the publisher found a number of articles, including this one, with a number of concerns, including but not limited to compromised editorial handling and peer review process, inappropriate or irrelevant references or not being in scope of the journal or guest-edited issue. Based on the investigation's fndings the publisher, in consultation with the Editor-in-Chief therefore no longer has confdence in the results and conclusions of this article. Authors N. Ashokkumar, Anjali Joshi, Pallavi Sagar Deshpande and Renato R. Maaliw III disagree with this retraction. Author M. Vijay Sekhar Babu has not responded to correspondence regarding this retraction. The publisher has been unable to obtain a current email address for author Ismail Keshta. The online version of this article contains the full text of the retracted article as Supplementary Information.
Electrical and electronic properties of nitrogen doped amorphous carbon (a-CNx) thin films
Sekhar C. Ray,W. Mbiombi,P. Papakonstantinou 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Nitrogen-doped amorphous carbon thin films (a-CNx) were prepared on silicon substrate by pulsed laser deposition process using methane (CH4) and nitrogen (N2) as source gas. The electrical properties of a- CNx films changes with nitrogen concentration in the film structure. The intensity ratio of the D and G peak (ID/IG) increases with higher nitrogen concentration, which means that sp2-clusters were formed in these films and is responsible for the enhancement of conductivity of the a-CNx films. We observed that the amorphous carbon (a-C) films becoming more graphitic in nature yielding higher conductivity/lower resistivity with increase of nitrogen concentration. Electron field emission result shows that the emission current density enhances with nitrogen doping that indicates the useful in electron field emission devices application.
MAC Layer Based Certificate Authentication for Multiple Certification Authority in MANET
Sekhar, J. Chandra,Prasad, Ramineni Sivarama The Institute of Electronics and Information Engin 2014 IEIE Transactions on Smart Processing & Computing Vol.3 No.5
In this study, a novel Randomly Shifted Certification Authority Authentication protocol was used in ad hoc networks to provide authentication by considering the MAC layer characteristics. The nodes achieve authentication through the use of public key certificates issued by a CA, which assures the certificate's ownership. As a part of providing key management, the active CA node transfers the image of the stored public keys to other idle CA nodes. Finally the current active CA randomly selects the ID of the available idle CA and shifts the CA ownership by transferring it. Revoking is done if any counterfeit or duplicate non CA node ID is found. Authentication and integrity is provided by preventing MAC control packets, and Enhanced Hash Message Authentication Code (EHMAC) can be used. Here EHMAC with various outputs is introduced in all control packets. When a node transmits a packet to a node with EHMAC, verification is conducted and the node replies with the transmitter address and EHMAC in the acknowledgement.
Synthesis of Triazoloquinoxalines as Antitubercular Agents
Sekhar, Kondapalli Venkata Gowri Chandra,Rao, Vajja Sambasiva,Kumar, Dalip Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
1,2,4-Triazoles and quinoxalines were found to display various pharmacological activities. Hence a series of 1-aryl-4-methyl-1,2,4-triazolo[4,3-a]quinoxalines were synthesized. Due to various advantages of organic reactions under solvent-free conditions these compounds were developed using iodobenzene diacetate under solvent-free conditions. The synthesized compounds were characterized by elemental microanalysis, infrared spectroscopy, $^1H$ NMR, $^{13}C$ NMR and HRMS. All the synthesized compounds were investigated for their antitubercular activity and 5g was found to the most active compound.
Sekhar, S. Chandra,Nagaraju, Goli,Cha, Sung Min,Yu, Jae Su The Royal Society of Chemistry 2016 Dalton Transactions Vol.45 No.48
<▼1><P>A cost-effective composite electrode featuring MnO2 NSAs@VCFs exhibits good electrochemical performance as an electroactive material for pseudocapacitors.</P></▼1><▼2><P>Manganese dioxide nanosheet arrays with interconnected arrangements are easily synthesized on vapor grown carbon fibers (MnO2 NSAs@VCFs) by a simple wet-chemical method at low temperature. The conductive nature of the VCFs serves as a scaffold and easily reduces potassium permanganate species for the formation of hierarchical MnO2 NSAs@VCFs. When utilized as an electroactive material for pseudocapacitors, the sophisticated configuration of the nanocomposite provides an effective electrochemical activity and an electron pathway for higher electrochemical performance in 1 M Na2SO4 aqueous solution. The hierarchical MnO2 NSAs@VCFs exhibit a maximum specific capacitance of 115.3 F g<SUP>−1</SUP> at a current density of 0.5 A g<SUP>−1</SUP> with an excellent cycling stability of 85.6% after 2000 cycles at a current density of 5 A g<SUP>−1</SUP>. Such facile and cost-effective fabrication of a metal oxide nanocomposite with improved electrochemical performance allows it to be considered as a promising electroactive material for energy storage devices.</P></▼2>
Sekhar, S. Chandra,Nagaraju, Goli,Yu, Jae Su Elsevier 2017 Nano energy Vol.36 No.-
<P><B>Abstract</B></P> <P>Silver nanowires (Ag NWs) have attracted particular interest in the development of various electronic and energy storage devices due to their one-dimensional structure, good conductivity, fast charge transportation and direct contact to the current collector. Herein, we have successfully deposited the binder-free nickel-cobalt layered double hydroxide nanosheets on Ag NWs-fenced carbon cloth (NC LDH NSs@Ag@CC) by a facile electrochemical deposition method with a chronoamperometry voltage of −1.0V for 120s. The electrically conductive and superhydrophilic nature of the hybrid nanocomposite electrode led to relatively high areal capacitance (1133.3 mF cm<SUP>−2</SUP> at 1mAcm<SUP>−2</SUP>) and good cycling stability (80.47% after 2000 cycles) compared to the electrode prepared without Ag NWs. Using such hierarchical NC LDH NSs@Ag@CC as a positive electrode, we further fabricated a flexible asymmetric supercapacitor (ASC) with activated carbon coated CC as a negative electrode. The as-assembled ASC exhibited maximum operational potential window of 1.6V, high areal capacitance of 230.2 mF cm<SUP>−2</SUP> and excellent cycling stability of 88.1% with remarkable energy densities at all the charge-discharge conditions (78.8 μWh cm<SUP>−2</SUP> at the power density of 785 μW cm<SUP>−2</SUP> and 40 μWh cm<SUP>−2</SUP> at the high power density of 12.1mWcm<SUP>−2</SUP>, respectively)</P> <P><B>Highlights</B></P> <P> <UL> <LI> Conductive Ag NWs are uniformly decorated on carbon cloth fibers (Ag@CC). </LI> <LI> The highly conductive features and hydrophilicity of Ag@CC induce the dense growth of NC LDH NSs. </LI> <LI> Ag NWs provide the effective pathways for electron transportation during the redox process of NC LDH NSs. </LI> <LI> The areal capacitance of the electrode with Ag NWs is 2.3 times higher than the electrode without Ag NWs. </LI> <LI> The assembled asymmetric supercapacitor delivers high energy and power densities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Sekhar S. Pindiprolu,Mark S. Innocenti KOREA INSTITUTE FOR SPECIAL EDUCATION 2005 The Asia-Pacific Journal of Inclusive Education Vol.2 No.-
individualized early intervention plans (referred to as Plans) are required in the United States (U.S.) for young children with disabilities. In this study, individual early intervention plans (i.e., Individualized Family Service Plans or IFSPs and Individualized Education Programs or IEPs) from a western U.S. state were examined for their compliance, quality, and appropriateness. A total of 127 IFSPs and 244 IEPs were obtained from five early intervention programs and six local education agency preschool special education programs as part of a statewide evaluation of early intervention services. Compliance was measured by noting the presence of mandated components, as specified in the Individuals with Disabilities Education Act, in the Plans. Quality was measured by nothing the presence of components advocated by professionals as best practices in the literature. Further, the goals/outcomes and objectives were coded for their quality using an adapted evaluation criteria (Notari & Bricker, 1990; Notari and Shuster, 1994). Appropriateness was measured in terms of the relationship between the childs classification and goals/outcome domains listed on the Plans. Results suggest that (a) the Plans, in general, were in compliance with the mandated components, (b) there were discrepancies in the quality of various aspects of the Plans, and (c) the goal/outcomes were congruent with the childrens disability classification. Issues for improving the quality of the Plans and the need for research demonstrating the Plans are linked to child progress are discussed.
Sekhar, J. Chandra,Prasad, Ramineni Sivarama The Institute of Electronics and Information Engin 2015 IEIE Transactions on Smart Processing & Computing Vol.4 No.2
This paper presents a Cuckoo search algorithm to secure adversaries misdirecting multi-hop routing in Mobile ad hoc networks (MANETs) using a robust Trust Predicated Routing Framework with an optimized cluster head selection. The clustering technique designed in this framework leads to efficient routing in MANETs. The heavy work load in the node causes an energy drop in cluster head, which leads to re-clustering of the group, and another cluster head is selected to avoid packet loss during data transmission. The problem in the re-clustering process is that the overall efficiency of the routing process is reduced and the processing time is increased. A Cuckoo search based optimization algorithm is proposed to solve the problem of re-clustering by selecting the secondary cluster head within the initially formed cluster group and eliminating the reclustering process. The proposed framework enables a node to select a reliable and secure route for MANET and the performance can be evaluated by comparing the simulated results with the AODV routing protocol, which shows that the performance of the proposed routing protocol are improved significantly.