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Nowadays data sharing over the internet is a major and critical issue due to security problems. So more security mechanisms are required to protect the data while sharing through an unsecured channel. Open network transactions of messages be they of any kind demands the digital signature technique. Being one of the most important developments in public key cryptography, the digital signature provides a collection of security patches that help in providing at most authenticity and security. The digital signature is related to the secure Hash function. In this paper, we have reviewed the most recent and efficient Digital signature algorithms in digital communications and summarized the respective gaps.&nbsp

Psychosocial factors influence a person psychologically or socially. Psychosocial problems include mood changes, anxiety, fatigue, sleepiness, depression, urinary infection, panic disorders and others. In this study researcher had taken 50 respondents from Kadaba taluk, Dakshina Kannada district, Karnataka State. Study used structured questionnaire among 5 to 9 months pregnant women. Researcher used both primary and secondary sources of data and this study shows that 98% of respondents are having back pain problem and were well treated by in- laws. This research revealed almost 80% respondents were economically poor. The study result showed that 82% of the pregnant women got sufficient care from the family.

Wireless mesh network (WMN) is a new trend in wireless communication promising greater flexibility, reliability, and performance over traditional wireless local area network (WLAN). Test bed analysis and emulation plays an essential role in valuation of software defined wireless network and node mobility is the prominent feature of next generation software defined wireless network. In this study, the mobility models employed for moving mobile stations in software defined wireless network are explored. Moreover, the importance of mobility model within software defined wireless mesh network for enhancing the performance through handover-based load balancing is analyzed. The mobility models for the next generation software defined wireless network are explored. Furthermore, we have presented the mobility models in the mininet-Wi-Fi test bed, and evaluated the performance of Gauss Marko’s mobility model.

The energy system performance could be enhanced by using the Flexible AC transmission System (FACTS) devices such as, Interline Power Flow controller (IPFC) and Static Series Synchronous Compensator (SSSC). Because of its considerable cost, it is very important to limit the amount of these controllers and locate them optimally in the ability system to be able to achieve an improved utilization of FACTS devices. Firstly, we've applied optimization techniques, namely, Artificial Neural Network (ANN), Elitist Nondominated Sorting Genetic Algorithm(NSGA-II) and Perturb and Observe Method Algorithm (P&O) to learn the perfect amount of multi-devices of Interline Power Flow Controller and Static Series Synchronous Compensator to be able to improve the device loadability and to ensure the steady state security of the network. Secondly, we performed a contingency analysis procedure based on severity index (SI) to spot and classify the absolute most severe line contingencies. Then, we determined the perfect placement and parameter setting of FACTS devices in power system by using the above optimization approach to ease the line overloads. To guarantee the robustness and effectiveness of the proposed method, the optimization problem presented in this paper aims at reducing FACTS installation cost and decreasing total real and reactive power losses. &nbsp

The road to a successful introduction of vehicularcommunications has to pass through the analysis of potential security threats and the design of a robust security architecture able to cope with these threats. Broadcast communications are critically important, as many safety-related applications rely on single-hop beacon messages broadcast to neighbor vehicles. It becomes a challenging problem to design a broadcast authentication scheme for secure vehicle-to-vehicle communications.In this paper, we undertake this challenge. In this paper, communication technique is used for improved road safety with aid of Secure Prediction based authentication scheme. Here, Beacons are used for secure V2V and V2R communication. When a large number of beacons arrive in a short time, vehicles are vulnerable to computation-based Denial of Service (DoS) attacks that excessive signature verification exhausts their computational resources. In contrast to most existing authentication schemes, our SPBAis an efficient and lightweight scheme since it is primarily built on symmetric cryptography. To further reduce the verification delay for some emergency applications, SPBA is designed to exploit the sender vehicles ability to predict future beacons in advance. In addition, to prevent memory-based DoS attacks, SPBA only stores shortened re-keyed Message Authentication Codes (MACs) of signatures without decreasing security.

Department of Chemistry, Nagpur University, Nagpur-440 010 Manuscript received 23 June 1995, revised 28 February 1996, accepted 30 April 1996 Polarographic Determination of Metronidazole and Chloramphenicol.