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Search Results: 1 - 10 of 200712 matches for " P. Valarmathi "
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P. Valarmathi,S. Thirumaran,S. Selvanayagam
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811050550
Abstract: The NiII atom in the mononuclear title compound, [Ni(C10H10NS2)(NCS)(C18H15P)], exists within a S2PN donor set that defines a distorted square-planar geometry. A significant asymmetry in the Ni—S bond lengths support the less effective trans effect of SCN over PPh3.
A Raja,G. Valarmathi,P. Gajalakshmi,P. Prabakaran
International Journal of Biomedical and Advance Research , 2012, DOI: 10.7439/ijbar.v3i5.423
Abstract: The present study reveals that the effect of extra cellular protein isolated from Psychrophilic Actinomcetes against clinical pathogens. Totally 13 Actinomycetes were isolated from glacier soil. Among them the genus Streptomycetes and Micromonospora were isolated highly. MM9 medium was used as fermentation medium and the antimicrobial peptide activity was performed by disc diffusion method. Out of 14 isolated actinomycetes C2, I and J were found to be effectively produce antimicrobial Extracellular protein active against 3 test pathogens. The most important significant finding of this work is antimycobacterial activity of extracellular protein produced by Streptomycetes (C2) and Micromonospora sp (J) were active against Mycobacterium tuberculosis. The zone of inhibition was 20 mm (C2) and 22mm (J) respectively. Among the C2, I and J isolates Micromonospora sp (J) is most effective towards all three test organism. The molecular weight of antimycobacterial protein was 39,000 Da (C2) and 3000 Da (J)
Rajni Kant,Vivek K. Gupta,Kamini Kapoor,P. Valarmathi
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811051348
Abstract: In the centrosymmetric title compound, [Cd2(C13H12NOS2)4], pairs of dithiocarbamate ligands exhibit different structural functions. Each of the terminal ligands is bidentately coordinated to one CdII atom and forms a planar four-membered CS2Cd chelate ring, whereas pairs of the tridentate bridging ligands link two neighbouring CdII atoms, forming extended eight-membered C2S4Cd2 tricyclic units whose geometry can be approximated by a chair conformation. The coordination polyhedron of the CdII atoms is a distorted square-pyramid. The five-membered furan ring and the benzene ring are disordered over two sets of sites with an occupancy ratio of 0.62 (8):0.38 (8).
P. Valarmathi,S. Thirumaran,Kamini Kapoor,Vivek K. Gupta
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811054791
Abstract: In the title complex, [Cd(C6H11N2S2)2(C5H5N)2], the CdII ion is hexacoordinated by two N atoms from two pyridine ligands and by four S atoms from two dithiocarbamate ligands in a distorted octahedral geometry. The CdII ion lies on a twofold axis. The piperazine ring is in chair conformation and its least-squares plane makes a dihedral angle of 81.4 (1)° with that of the pyridine ring.
An Enhanced Scheme for Improving Packet Retransmission over Mobile Ad-Hoc Networks Using TCP
S. Karthik,S. Kannan,V.P. Arunachalam,T. Ravichandran,M.L. Valarmathi
Journal of Engineering and Applied Sciences , 2012, DOI: 10.3923/jeasci.2010.234.238
Abstract: Denial of Service (DoS) attacks constitutes one of the major threats and among the hardest security problems in today's Internet. Of particular concern are Distributed Denial of Service (DDoS) attacks whose impact can be proportionally severe. With little or no advance warning, a DDoS attack can easily exhaust the computing and communication resources of its victim within a short period of time. Because of the seriousness of the problem many defense mechanisms have been proposed to combat these attacks. This study aims to provide an understanding of the existing attack methods, tools and defense mechanisms, so that a better understanding of DDoS attacks can be achieved. The goal of the study is to simulate an environment by extending NS2, setting attacking topology and traffic which can be used to evaluate and compare the methods of DDoS attacks and tools. Based on the simulation and evaluation results, more efficient and effective algorithms, techniques and procedures to combat these attacks may be developed.
A Priority Based Bandwidth Reservation Protocol for Wireless Mesh Networks
K. Valarmathi,N. Malmurugan
International Journal of Computer Science Issues , 2012,
Abstract: In wireless mesh networks, when compared with traditional applications, multimedia application requires the need of inflexible Quality of services (QoS) for high speed digital audio and videos. Under such a condition, the need of proper resource allocation is extremely handy. In this paper, we propose to develop a Priority Based Bandwidth Reservation Protocol (PBRP) for wireless mesh networks. Our protocol consists of two phases namely Bandwidth Request phase and Bandwidth Reply phase. In the former Phase, a Bandwidth Request (BREQ) message is forwarded from the node that requests the admission of a new traffic flow to its destination. In the later Phase, a Bandwidth Reply (BREP) message proceeds backwards, hop-by-hop, from the destination node to the node that originated the request along the path laid down by the corresponding (BREQ) message. The destination node precedes the reply according to the priority of traffic classes and reserves the bandwidth on the reply path. By simulation results, we show that our proposed protocol achieves high bandwidth utilization and throughput with reduced delay, when compared with existing technique.
R. Valarmathi et al.
International Journal of Pharmaceutical Sciences and Research , 2011,
Abstract: The potential antioxidant effect ethanol induced liver damage was investigated using crude methanolic extract of the whole plant of Mollugo pentaphylla Linn. The standard drug used was ascorbic acid mg / kg/day. Serum cholesterol, triglycerides aspartate amino transferase (AST) and alanine amino transferase (ALT) levels were measured as antioxidant indicators. There was a significant reduction in the elevated serum enzymes, triglycerides and total cholesterol levels. The histopathologial studies revealed that the liver cells undergoing hydrobic and fatty changes indicating hepato cellular damage in the case of ethanol administration while extract treated animals showed mostly normal hepatocytes and mild hydrobic changes. Hence the study concluded that the plant exhibits antioxidant property.
Knowledge of nurses towards dengue fever in a tertiary care teaching hospital in Nepal
S Valarmathi,S Parajulee
Journal of College of Medical Sciences-Nepal , 2013, DOI: 10.3126/jcmsn.v9i1.9667
Abstract: Background:? Nurses are important health care professionals and should have wide knowledge about common diseases especially infectious diseases like dengue. Dengue is associated with shock and can lead to death. Aim:? To assess the knowledge of nurses regarding dengue fever and to study the association between the demographic variables. Setting and design:? A cross sectional study was conducted at the College of Medical Sciences-Teaching Hospital, Nepal among the nurses during December, 2010. Study tool:? Semi structured question was prepared to assess the knowledge of nurses in which there was objective question and Yes or No type questionnaire. Statistical analysis:? The filled questionnaires were collected and data were entered in Microsoft excel sheet and analyzed as per study objectives. Descriptive statistic was used to calculate the median (IQR) and non parametric tests (Kruskal Wallis test and Mann Whitney test) to compare the total scores with demographic profile of the subjects. Results:? Of the study members 89% were from Proficiency Certificate level (PCL) background and the mean (IQR) age of the respondents was 21 years (20-22.75). Overall score of the nurses was 11 (9-13) with a maximum possible score of 17. There were no association between the respondents knowledge scores with age (p=0.14); educational qualifications (p=0.86); duration of experience (p=0.59); ward (p=0.28). Conclusion:? The study findings report a low knowledge among the nursing practitioners on dengue fever and its complications and their knowledge did not have any association with their demographic variables. Journal of College of Medical Sciences-Nepal, 2013, Vol-9, No-1, 7-13 DOI: http://dx.doi.org/10.3126/jcmsn.v9i1.9667
Knowledge of nursing students towards HIV/AIDS in Nepal
Sita Parajulee,Valarmathi Selvaraj
Journal of College of Medical Sciences-Nepal , 2012, DOI: 10.3126/jcmsn.v8i4.8697
Abstract: Aims First case of Acquired Immuno Deficiency Syndrome (AIDS) in Nepal was reported in the year 1988. Nurses are an integral part of the healthcare system and should be knowledgeable in providing care to AIDS patients. This study assessed the knowledge of nursing students towards HIV/AIDS, and the association (if any) between the knowledge scores of the nursing students with their selected demographic variables. Materials and methods A cross sectional study was conducted evaluating the nursing student knowledge using a self designed questionnaire. The correct answers were given a score of ‘1’ and wrong answers were given a score of ‘0’ (total possible maximum score ‘18’). Results Among the total 165 nursing students, 121 of them filled the questionnaire (response rate of 73.33%) and all of them were females. The mean ± SD age of the respondents was 18.3 ±1.75 years. The median (IQR) of the overall total scores was 13.0 (11.5-15.0). There was an association between the knowledge scores of the respondents with ‘age’ (p=000), ‘course of the study’ (p=0.001). However, there was no statistically significant association between the knowledge scores with the ‘year of study’ of the respondents (p=0.109), ‘mode of finance’ (0.611) and ‘native’ of the students (0.173). Conclusion The study suggested that nursing students have a poor overall knowledge on AIDS and especially areas such as post exposure prophylaxis.The findings also suggested the need for providing adequate knowledge to the students during their regular class room teaching and clinical postings. Journal of College of Medical Sciences-Nepal, 2012, Vol-8, No-4, 27-33 DOI: http://dx.doi.org/10.3126/jcmsn.v8i4.8697
Joint Design of Congestion Control Routing With Distributed Multi Channel Assignment in Wireless Mesh Networks
K. Valarmathi,N. Malmurugan
Computer Science , 2010,
Abstract: In Wireless Mesh Networks (WMN), a channel assignment has to balance the objectives of maintaining connectivity and increasing the aggregate bandwidth. The main aim of the channel assignment algorithm is to assign the channels to the network interfaces, from the given expected load on each virtual link. From the existing work done so far, we can examine that there is no combined solution of multi-channel assignment with routing and congestion control. In this paper, we propose a congestion control routing protocol along with multi-channel assignment. We use a traffic aware metric in this protocol in order to provide quality of service. The proposed protocol can improve the throughput and channel utilization to very high extent because it provides solution for multi-channel assignment and congestion control. The proposed algorithm assigns the channels in a way that, congestion is avoided and co-channel interference levels among links with same channel are reduced. By our simulation results in NS2, we show that the proposed protocol attains high throughput and channel utilization along with reduced latency.
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