iosr-JCE   Volume-17 ~ Issue-2 ~ March-April 2015

Abstract: In this paper, we propose a Multihop Multi-Channel Distributed QoS Scheduling MAC scheme (MMDQS-MAC) to improve the network performance of WSNs, which selects the best channel for an individual wireless sensor node. MMDQS-MAC supports dynamic channel assignment mechanism where each sensor node is equipped with a directional antennas. The proposed protocol helps to decrease the probability of collision, interferences and improves the overall network performance of Wireless Sensor Networks (WSNs). The protocol is most suitable for short packet transmission under low traffic networks and has ability to utilize parallel transmission among neighboring nodes and achieves increased energy efficiency when multi-channels are available. Simulation result shows that the proposed protocol improves the performance of aggregate throughput, probability of successful transmission, packet delivery ratio, energy consumption and average end-to-end delay.

Keywords: Medium Access Control (MAC); Quality of Service (QoS); Wireless Sensor Networks (WSNs); Multi-Channel (MC)

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Abstract: While email is fairly reliable, messages do get lost. This can be due to the store-and-forward nature of e- mail, which passes responsibility for delivering email from one mail server to another, but in doing so exposes messages to loss, should a server not fulfil its responsibility. Some end users are more sensitive to email unreliability than others, and seek tools with which they can detect and recover from email failures. This paper describes tools that allow email sending software to automatically respond to reports of undeliverability by persisting with retransmission or retransmitting to alternate recipients.

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Abstract: Mobile forensic is fast becoming an abbreviated term that describes the process of applying digital forensics in mobile phones world. The rapid development in mobile phones industry has led to the emergence of the so-called smart phones which have become nearly the same as computers. Android Smartphones refer to all types of smartphones that use Android operating system. This paper aims to survey the tools and techniques that are used to forensically investigate Android mobile and then provides comparison between the tools according to their roles in the investigation process. Finally, the paper gives recommendation for following the best practices for investigating Android smartphones.

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[3]. E. H. S. Brian D. Carrier. 02/02/2015). An Event-Based Digital Forensic Investigation Framework. Available: http://www.digital-evidence.org/papers/dfrws_event.pdf
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Abstract: This paper discusses a propose cloud infrastructure that combines On-Demand allocation of resources with improved utilization, opportunistic provisioning of cycles from idle cloud nodes to other processes.Because for cloud computing to avail all the demanded services to the cloud consumers is very difficult. It is a major issue to meet cloud consumer's requirements. Hence On-Demand cloud infrastructure using Hadoop configuration with improved CPU utilization and storage utilization is proposed using splitting algorithm by using Map-Reduce. Henceall cloud nodes which remains idle are all in use and also improvement in security challenges and achieves load balancing and fast processing of large data in less amount of time. Here we compare the FTP and HDFS for file uploading and file downloading; and enhance the CPU utilization and storage utilization. Cloud computing moves the application software and databases to the large data centres, where the management of the data and services may not be fully trustworthy. Therefore this security problem is solve by encrypting the data using encryption/decryption algorithm and Map-Reducing algorithm which solve the problem of utilization of all idle cloud nodes for larger data.

Keywords: CPU utilization, Storage utilization, Map-Reduce,Splitting algorithm, Encryption/decryption algorithm.

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