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Gopalan, Anantha Iyengar,Lee, Kwang-Pill,Hong, Mung-Hwa,Santhosh, Padmanabhan,Manesh, Kalayil Manian,Kim, Sang-Ho American Scientific Publishers 2006 Journal of nanoscience and nanotechnology Vol.6 No.6
<P>Hollow spheres of poly(diphenylamine) (PDPA) was prepared by confining PDPA in the galleries of montmorillonite organo clay modified with organoammonium cations (MMT). At first instant, diphenylamine (DPA) was loaded into the galleries of MMT and subjected to subsequent oxidative polymerization to form PDPA. beta-naphthalene sulfonic acid (NSA) was used as medium to influence self-assembly of DPA inside the galleries of MMT. Polymerization of self assembled structure resulted hollow spheres of PDPA inside galleries of MMT. X-ray diffraction analysis (XRD), field emission transmission electron microscopy (FETEM), Fourier transform infra-red spectroscopy (FT-IR) and thermogravimetric analysis (TGA) were used to characterize the composites. Transmission emission microscopy of the composite shows the hollow spherical morphology of PDPA. FT-IR, UV-Visible spectroscopy, conductivity measurement and X-ray photoelectron spectroscopy were used to characterize the PDPA extracted from MMT galleries. PDPA extracted from MMT galleries was found to have difference in electronic property than PDPA formed by the conventional method, due to the confinement effect.</P>
N. Ch. S. N. Iyengar,Gopinath Ganapathy 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.7
Cloud computing is a technology which completely shifts the data to unaware Datacenter (DC) where the cloud service provider (CSP) is responsible for the subscribers’ data and its protection. Distributed Denial of Service (DDoS) is a kind of overload threat aims to subvert DC and their resources which leads to resource unavailable to legitimate requestors. In this paper we proposed an effective layered load balancing mechanism which scrutinizes the incoming requestors’ traffic at various layers and each layer outwits some kind of attack traffic. The early network traffic condition prediction paves the way to detect the threats earlier which in turn improves the availability. The significance of the proposed mechanism is detecting the higher rate of overload threats at earlier layers. Constant monitoring and stringent protocol setup for incoming traffic strengthens the proposed mechanism against several kinds of overload threats. Based on the traffic pattern of incoming requestors, the vulnerability is observed and outwitted at various layers. The simulation proved that the mechanism proposed is deployable at an attack-prone DC for resource protection, which would eventually benefit the DC economically as well.
N. Ch. S. N. Iyengar,Gopinath Ganapathy 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.9
Cloud computing is an advantageous technology, which allows any enterprises to shift their data towards Cloud Service Provider (CSP) end. This shift poses an essential necessity for data being available all the time with a considerable level of security. Availability is an important concern for any subscribers as their sensitive data are prone to attack threats. Resource and data availability are most important security measure. So, blocking the attack traffic towards Data Center (DC) improves availability, but passive outwitting leads to high false positive and negative rate. This affects the legitimate requestors being outwitted. So, the proposed chaotic theory based defense mechanism considers the stability state of traffic and detects the anomaly traffic condition. The anomaly traffic condition is just the passive way of diminishing the effect of overload, but classifying them appropriately and allowing the non-attack case of overload improves the availability and utilization and reduces the false case rates. Considering several cases of overload threats and allowing the legitimate overload case improves efficiency. The simulation results proved that the mechanism proposed is deployable at an attack-prone DC for resource protection, which would eventually benefit the DC economically as well.
Ubiquitous Cloud Based Bookcafé
Imran Ahmed,Satish Janghel,N. Ch. S. N. Iyengar 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
Cloud services provide platform for multiple users to remotely store , share and update data items. Mobile virtual environment and effective use of cloud computing made this great success. . This paper is an implemented real time web and mobile application named BookCafé using cloud database storage (common for both web and mobile) provided by Amazon web service. BookCafé is a storage where all the books will be stored with year wise and subject wise classification for student’s purpose. Update’s can be done at any time. They can have like laptops, smart phones, and tablet computer devices. Users of Online web application (non smart) access through user interface for signing, reading and uploading new books category wise. By uploading the android application on Google Play store, smart phone users can avail all the facilities on their handheld devices. The students either through mobile (android based) or through web, share and upload new books from anywhere in the campus by connecting to cloud.
Natural frequency characteristics of composite plates with random properties
Salim, S.,Iyengar, N.G.R.,Yadav, D. Techno-Press 1998 Structural Engineering and Mechanics, An Int'l Jou Vol.6 No.6
Exercise of complete control on all aspects of any manufacturing / fabrication process is very difficult, leading to uncertainties in the material properties and geometric dimensions of structural components. This is especially true for laminated composites because of the large number of parameters associated with its fabrication. When the basic parameters like elastic modulus, density and Poisson's ratio are random, the derived response characteristics such as deflections, natural frequencies, buckling loads, stresses and strains are also random, being functions of the basic random system parameters. In this study the basic elastic properties of a composite lamina are assumed to be independent random variables. Perturbation formulation is used to model the random parameters assuming the dispersions small compared to the mean values. The system equations are analyzed to obtain the mean and the variance of the plate natural frequencies. Several application problems of free vibration analysis of composite plates, employing the proposed method are discussed. The analysis indicates that, at times it may be important to include the effect of randomness in material properties of composite laminates.
Patil, Seema,Iyengar, Asha R,Kotni, Ramya Madhuri,BV, Subash,Joshi, Revan Kumar The Korean Pain Society 2016 The Korean Journal of Pain Vol.29 No.1
Background: The study aimed to determine if ultrasonography of masseter can be used to evaluate the outcome of transcutaneous electrical nerve stimulation (TENS) in subjects with temporomandibular disorders (TMDs) such as myositis and myofascial pain. Methods: Fifteen TMD subjects with myofascial pain/myositis who satisfied the RDC/McNeil criteria were included in the study. All the subjects were administered TENS therapy for a period of 6 days (30 minutes per session). The mouth opening (in millimeters) and severity of pain (visual analogue scale score) and ultrasonographic thickness of the masseter (in millimeters) in the region of trigger/tender areas was assessed in all the subjects both prior and post TENS therapy. A comparison of the pre-treatment and post-treatment values of the VAS score, mouth opening and masseter thickness was done with the help of a t-test. Results: There was a significant reduction in the thickness of masseter muscle (P = 0.028) and VAS scores (P < 0.001) post TENS therapy. There was also a significant improvement in the mouth opening (P = 0.011) post TENS therapy. Conclusions: In the present study, ultrasonography was found to be an effective measuring tool in the assessment of TENS therapy in subjects with myositis and myofascial pain.
Ragupathy, Dhanusuraman,Gopalan, Anantha Iyengar,Lee, Kwang-Pill The Korean Society of Analytical Sciences 2008 분석과학 Vol.21 No.1
Organic disulfide compounds are having higher theoretical capacity than the conventional cathode material and are considered as the important storage material. Here, we are reporting the preparation of poly (2,2'-dithiodianiline) PDDA/multiwall carbon nanotubes, (MWCNTs) composites under different experimental conditions. Amine functionalized and unfunctionalized MWCNTs were independently used for the preparation of composites. Composites were prepared in the presence of cetyl trimethyl bromide (CTAB), a cationic surfactant, and also in the absence of CTAB. A physical mixture of PDTDA and MWCNTs was formed with unfunctionalized MWCNTs. Grafting of PDDA onto MWCNTs was performed by chemical oxidative polymerization of 2, 2'-dithiodianiline in the presence of amine functionalized MWCNTs. The composites of MWCNTs and PDTDA were characterized for structure, morphology and thermal properties through Fourier transform infrared spectroscopy, Fourier transform Raman spectroscopy, scanning electron microscopy and UV-visible spectroscopy. The composite materials prepared by this method are expected to find applications as electrode materials for lithium batteries.