RESEARCH NOTES : Molecular Taxonomy of Ganoderma cupreum from Southern India Inferred from ITS rDNA Sequences Analysis

( Malarvizhi Kaliyaperumal ) 한국균학회 2013 Mycobiology Vol.41 No.4

Ganoderma is a cosmopolitan wood-rot basidiomycete that has been extensively studied for its pathogencity and medicinal properties. Identification of Ganoderma based on macro-microscopic features led to large number of synonyms which resulted in 250 taxonomic names. A Ganoderma species collected from Courtallam, Tamil Nadu was identified as G. cupreum. Phylogenetic analysis inferred from internal transcribed spacer rDNA region resolved the Indian isolate MYC1 as Ganoderma cupreum which clustered with Australian and Asian “cupreum” clade with 85% bootstrap support BS and shared 99% and 98% nucleotide similarity with Malaysian and Australian ‘cupreum’ respectively. This study represents the first molecular evidence of G. cupreum from Asian origin.

Enhancing Cell Edge Performance in Cellular Mobile System

C. Malarvizhi,V. Nithya 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.6

Cell edge effect has been recently paid much attention in the development of new mobile communication systems because it can cause serious performance degradation in the cell edge. The cell edge problem is essentially due to non-uniform distribution of the radio power of cellular systems. It can be softened to a certain extent by using new radio architecture called distributed antenna system (DAS). In traditional collocated antenna system (CAS), multiple antennas are centrally located at the BSs, while in the DAS, multiple antennas of BS called remote antenna unit (RAUs) are separately and remotely located in a cell and connected to a baseband processing unit (BPU) via high speed backbone links. Since the distance between the mobile terminals (MTs) and the antenna of the BS is greatly reduced by introducing RAUs, the large path loss of the radio signals can be avoided. The objective is to tackle the shortcomings due to the cell edge effects in a cellular system by suitably changing the existing collocated antenna system (CAS) to a distributed antenna system (DAS) and to compare its performance. The performance analysis namely bit error rate (BER) and capacity were performed and the results are shown. It is inferred from the results that the proposed DAS scheme outperforms the existing CAS scheme.

Genotypic Variations in Phosphorus Acquisition and Utilization Efficiency in Rice

Palaniappa Pillai Malarvizhi,Viswanathan Sanjivkumar 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Phosphorus Acquisition by Maize and Cotton in Low Phosphorus Soil

Meena Sadasivam,Rajeswari Ramanathan,Malarvizhi Palaniappan 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Tensile and impact toughness properties of various regions of dissimilar joints of nuclear grade steels

K. Karthick,S. Malarvizhi,V. Balasubramanian,S.A. Krishnan,G. Sasikala,Shaju K. Albert 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.1

Modified 9Cr-1Mo ferritic steel is a preferred material for steam generators in nuclear power plants fortheir creep strength and good corrosion resistance. Austenitic stainless steels, such as type 316LN, areused in the high temperature segments such as reactor pressure vessels and primary piping systems. So,the dissimilar joints between these materials are inevitable. In this investigation, dissimilar joints werefabricated by the Shielded Metal Arc Welding (SMAW) process with Inconel 82/182 filler metals. Thenotch tensile properties and Charpy V-notch impact toughness properties of various regions of dissimilarmetal weld joints (DMWJs) were evaluated as per the standards. The microhardness distribution acrossthe DMWJs was recorded. Microstructural features of different regions were characterized by optical andscanning electron microscopy. Inhomogeneous notch tensile properties were observed across theDMWJs. Impact toughness values of various regions of the DMWJs were slightly higher than the prescribedvalue. Formation of a carbon-enriched hard zone at the interface between the ferritic steel andthe buttering material enhanced the notch tensile properties of the heat-affected-zone (HAZ) of P91. Thecomplex microstructure developed at the interfaces of the DMWJs was the reason for inhomogeneousmechanical properties

A vacuum pressure sensor based on graphene/ZnO nanorod Schottky junction

Sakthivel P.,Ramachandran K.,Malarvizhi M.,Karuppuchamy S.,Manivel P. 한국탄소학회 2024 Carbon Letters Vol.34 No.1

We present a practical vacuum pressure sensor based on the Schottky junction using graphene anchored on a vertically aligned zinc oxide nanorod (ZnO-NR). The constructed heterosystem of the Schottky junction showed characteristic rectifying behavior with a Schottky barrier height of 0.64 eV. The current–voltage (I–V) features of the Schottky junction were measured under various pressures between 1.0 × 103 and 1.0 × 10−3 mbar. The maximum current of 38.17 mA for the Schottky junction was measured at – 4 V under 1.0 × 10−3 mbar. The high current responses are larger than those of the previously reported vacuum pressure sensors based on ZnO nanobelt film, ZnO nanowires, and vertically aligned ZnO nanorod devices. The pressure-sensitive current increases with the vacuum pressure and reaches maximum sensitivity (78.76%) at 1.0 × 10−3 mbar. The sensitivity and repeatability of the Schottky junction were studied by the current–time (I–T) behavior under variation of vacuum pressure. The sensing mechanism is debated from the surface charge transfer doping effect by oxygen chemisorption. The results suggest that this simple graphene/ZnO-NR Schottky junction device may have potential in the fabrication of vacuum pressure sensor with high sensitivity.

Reduced-Complexity k-best Decoder for LTE Standard

Shirly Edward.A,Malarvizhi.S 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.3

This paper presents a VLSI implementation of reduced -complexity and reconfigurable MIMO(Multiple-Input Multiple-Output) signal detector targeting 3GPP-LTE standard. In recent wireless communication system, MIMO technology is considered as the key technique in LTE to meet the target. Maximum Likelihood (ML) detection is the optimal detection algorithm for MIMO systems. FPGA implementation of ML detector becomes infeasible as its complexity grows exponentially with the increase in number of antennas. Therefore, we propose a modified K-best detector algorithm which employs parallel and distributed sorting strategy combined with bitonic sorter that has near-ML detection solution. The design was implemented targeting Xilinx Spartan 6 device and the resource utilization results are presented and the performance comparison with the literature was also done. The total on-chip power estimated is 213mW.

MIMO Cognitive Radio Spectrum Sharing Using Spatial Coding and User Scheduling for Fading Channels

Vijayakumar Ponnusamy,Dr. S. Malarvizhi 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.3

Spectrum scarcity is one of the issue in wireless communication. Dynamic spectrum sharing is the solution for this problem in which the underutilized spectrums are utilized efficiently. Multiple Input Multiple Output (MIMO) based cognitive radio using spatial coding is used to dynamically share the spectrum which allows simultaneous usage of spectrum by more than one user. The drawback of spatial coding is the achievable capacity get reduced with the increased number of cognitive users which limits the number of users to share the spectrum. In order to maximize the number of secondary users sharing the spectrum of the primary user, this paper presents a cluster based multiple primary and secondary user’s MIMO spatial coding which provides higher capacity. The entire network is divided into number of cluster based on the location such that each cluster will be interference free from other. Each cluster is designed with one primary user and many secondary users and a User Scheduling algorithm called Cluster Based Max Signal Power User Scheduling (CBMSPUS) is proposed to select two best secondary users in each cluster. Since the performance of spatial coder depends on the channel matrix, this paper analyze the spatial pre-coder under Rayleigh, Rican and Nakagami fading channels with multiple users and evaluate the capacity of users under CBMSPUS scheduling algorithm. The results show that the Nakagami fading channel achieves high capacity than others. Primary user calculated capacity is 10.8bits/HZ /channel at low SNR region and 14.2 bits/HZ/channel at high SNR region. The secondary user archives maximum capacity of 9.8bits/HZ /channel at low SNR and 13 bits/HZ/channel at high SNR. The Proposed Scheduling method offers maximum of 15dB gain comparing FIFO scheduling algorithm.

A Survey on Detection and Prevention of Cross-Site Scripting Attack

V. Nithya,S. Lakshmana Pandian,C. Malarvizhi 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.3

In present-day time, securing the web application against hacking is a big challenge. One of the common types of hacking technique to attack the web application is Cross-Site Scripting (XSS). Cross-Site Scripting (XSS) vulnerabilities are being exploited by the attackers to steal web browser’s resources such as cookies, credentials etc. by injecting the malicious JavaScript code on the victim’s web applications. Since Web browsers support the execution of commands embedded in Web pages to enable dynamic Web pages attackers can make use of this feature to enforce the execution of malicious code in a user’s Web browser. The analysis of detection and prevention of Cross-Site Scripting (XSS) help to avoid this type of attack. We describe a technique to detect and prevent this kind of manipulation and hence eliminate Cross-Site Scripting attack.

Morinda pubescens J.E. Smith (Morinda tinctoria Roxb.) Fruit Extract Accelerates Wound Healing in Rats

Narayanasamy Mathivanan,Gangadharan Surendiran,Krishnamurthy Srinivasan,Kannan Malarvizhi 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.4

This study investigated the wound healing properties of the chloroform extract of Morinda pubescensfruit inrats. Topical application of M. pubescensfruit extract at 20 mg/mL and 10 mg/mL concentrations appreciably acceleratedwound healing in rats compared with controls. Complete wound contraction was achieved, and fresh hair began to grow inthe entire wounded area within 15 days in animals treated with the 20 mg/mL chloroform fruit extract of M. pubescenscom-pared with only 60% contraction without hair growth in control rats.