Informatics Publishing Limited

Vishnu Sharma ¹

Affiliations
1 The Government Raja Sil' Ramaswamy Mudaliar Lylng- ln Hospital, Madras, IN

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Vishnu Sharma ¹

Affiliations
1 The Government Raja Sir Ramaswamy Mudaliar Lying-In Hospital, Madras, IN

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Vishnu Sharma ¹

Affiliations
1 Women and Children's Hospital Egmore, Madras, IN

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Ravindra Patel , Vishnu Sharma , Ratnesh Litoriya

Abstract

This paper describes the function of handheld devices in mobile computing and the consequential security issues. The paper discusses the importance of a robust security policy to meet the challenges thrown up by penetration of handheld devices in business computing. This paper outlines some of these inherent challenges of mobile applications and puts forth the urge for a strong security policy to counter them. The paper starts with a broad scenario on mobile computing and then moves on two describe a few basic terms akin to mobile commerce. In this paper, the term handheld devices are used as a common name for all pocket-sized smart-phones and PDA (Personal Digital Assistant) devices using an open operating system. The central theme of this paper is that as Wireless/mobile devices and networking technology extends the traditional wired LAN, WAN, and even the Internet to include connectivity utilizing radio technology, the very nature of wireless technology presents unique security challenges. We converse security issues and their existing solutions in the mobile ad hoc network. be obligated to the defenseless of the mobile ad ad hoc network, there are abundant security intimidation that disturb the improvement of it. We first evaluate the main vulnerabilities in the mobile ad hoc networks,which have made it much easier to go through from attacks than the long-established wired network. Then we discuss the security criteria of the mobile ad hoc network and present the main attack types that exist in it. Finally we survey the existing security solutions for the mobile ad hoc network.

Keywords

Mobile Computing, Wireless Computing, Pervasive Computing, Nomadic Computing, Mobile Devices, Handheld Devices.

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Sabyasachi Mitra ¹, Vishnu Sharma ¹, Senthil Kalyandrum ¹, Romesh Chandra ¹, Sandeep Singh ¹, Rakhee Menon ¹, Ankur Patel ¹, Amitava Roy ¹, Archana Sharma ¹, Krishna Kanakgiri ², Mayank Mishra ²

Affiliations
1 Accelerator and Power Pulse Division, Bhabha Atomic Research Centre, Mumbai, IN
2 Veermata Jijabai Technological Institute, Mumbai, IN

Abstract

In this paper effect of stray capacitance on output voltage of the Marx Generator is studied. Stray capacitances formed between high voltage metallic structures of Marx generator and its ground enclosure play a critical role in determining the voltage and rise time of the output pulse. With increase in enclosure diameter erected leakage inductance increases and stray capacitance reduces, with decrease and vice versa. Eventually in both the cases output voltage reduces and rise time increases. This effect is predominant in fast rising low energy MARX generators having low erected capacitances. In this paper effort has been made to quantify these effects. Simulations were carried out for different enclosure structures to find out their effect on output voltage and rise time with a fixed load. It was observed that conical enclosure helps in mitigating this problem in MARX generator. Simulations were also carried out to optimize the flaring angle of the conical enclosure to obtain maximum output voltage. Simulated results are experimentally validated using a 22 stage 450 kV MARX generator. Details of the analysis, simulations and experimental results are narrated thoroughly in this paper.

Keywords

Marx Generator, stray capacitance, rise time, stray inductance

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