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Jalandhar, India

Bhandari P.,Doaba College | Gujral M.S.,Punjabi University
2014 Recent Advances in Engineering and Computational Sciences, RAECS 2014 | Year: 2014

This paper presents an ontological approach to perceive the current security status of the network. Computer network is a dynamic entity whose state changes with the introduction of new services, installation of new network operating system, and addition of new hardware components, creation of new user roles and by attacks from various actors instigated by aggressors. Various security mechanisms employed in the network does not give the complete picture of security of complete network. In this paper we have proposed taxonomy and ontology which may be used to infer impact of various events happening in the network on security status of the network. Vulnerability, Network and Attack are the main taxonomy classes in the ontology. Vulnerability class describes various types of vulnerabilities in the network which may in hardware components like storage devices, computing devices or networks devices. Attack class has many subclasses like Actor class which is entity executing the attack, Goal class describes goal of the attack, Attack mechanism class defines attack methodology, Scope class describes size and utility of the target, Automation level describes the automation level of the attack Evaluation of security status of the network is required for network security situational awareness. Network class has network operating system, users, roles, hardware components and services as its subclasses. Based on this taxonomy ontology has been developed to perceive network security status. Finally a framework, which uses this ontology as knowledgebase has been proposed. © 2014 IEEE. Source

Singh A.,Doaba College | Singh A.,National Institute of Technology Jalandhar | Jayoti D.,National Institute of Technology Jalandhar | Khushboo,Thapar University | Malik P.,National Institute of Technology Jalandhar
Liquid Crystals | Year: 2016

In the present work, polymer-stabilised blue phase liquid crystal ***(PS-BPLC) that exhibit the blue phase (BP) in a temperature range of 312.15 K to 298.15 K has been prepared. The textural and electro-optic studies were performed in the BP range using an in-plane switching (IPS) cell. Platelet-type textures of cubic BP having an average domain size of ~12 µm were observed. The on-state voltage increased with increasing the temperature due to reduced value of the Kerr constant. Further, the hysteresis was found to be reduced from 19.2% to 5.1% by operating the PS-BPLC sample cell at an elevated temperature. © 2016 Informa UK Limited, trading as Taylor & Francis Group Source

Sharma J.P.,Doaba College | Yamada K.,Nihon University | Sekhon S.S.,Guru Nanak Dev University
Ionics | Year: 2012

The effect of the addition of propylene carbonate (PC) on the ion transport behaviour of nanocomposite polymer electrolytes having composition of polyethylene oxide-hexafluorophosphoric acid-fumed silica has been studied. The ionic conductivity of 6. 89 × 10 -4 S cm -1 at 298 K has been obtained for these electrolytes along with good mechanical and thermal properties. The variation of 1H NMR linewidth with temperature shows line narrowing at the glass transition and melting temperature of the electrolytes which suggests the onset of long-range ion translational motion. The increase in ionic conductivity with the addition of PC is related to the transformation of these electrolytes to the amorphous phase which has been supported by X-ray diffraction results. The polymer electrolytes are thermally stable up to around 498 K and hence are suitable for various applications. © 2011 Springer-Verlag. Source

Singh A.,Doaba College | Malik P.,National Institute of Technology Jalandhar | Jayoti D.,National Institute of Technology Jalandhar
International Journal of Modern Physics B | Year: 2016

In the present work, we report the blue phase (BP) in a binary mixture of cholesteryl nonanoate (CN) and N-(4-ethoxybenzylidene)-4-butylaniline (EBBA). The mixture exhibits BP over a temperature range of 2.3 K at optimum composition (50:50) of liquid crystals (LCs). The effect of silica nanoparticles (SNPs) doping on thermal stability of BPs has also been demonstrated and nearly 6 K wide BP temperature range was achieved at 0.5 wt.% of SNPs. A porous type texture was also observed during the BP formation process in the doped samples. © 2016 World Scientific Publishing Company. Source

Jayoti D.,National Institute of Technology Jalandhar | Khushboo,Thapar University | Malik P.,National Institute of Technology Jalandhar | Singh A.,Doaba College
Liquid Crystals | Year: 2016

Photocurable polymer-dispersed ferroelectric liquid crystal were prepared by polymerisation-induced phase separation (PIPS). Morphological behaviour was analysed by polarising optical microscopy (POM) and scanning electron microscopy (SEM). FLC droplet size was found in the range of ~ 2–70 µm and decreases with an increase in polymer content. Relaxation frequency, dielectric strength and ac conductivity were evaluated as a function of polymer concentration and it was concluded that the polymer concentration has a significant effect on these parameters. The energy band gap ((Formula presented.)) increases with polymer concentration and was found in the range of ~ 3.3 eV at higher concentration of polymer. © 2016 Taylor & Francis Source

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