iosr-jmca   Volume-1 ~ Issue-2 ~ Nov – Dec 2014

ABSTRACT: Nowadays, Wireless Sensor Networks (WSNs) succed in domain of technology trends; new require'sare continuously have more complex challenging, such as the real time location. The MAC layer plays a crucial role in these networks; it controls the communication module and manages the medium sharing. In this work, we integrate the received signal strength path-loss exponent estimation (RSS PLE) based on location technique in Real Time Hybrid MAC (RTHMAC) protocol in goal to minimize the delay phase's and get more life time node's. It combinesalso the advantages of both TDMA and FDMA in order to give a soft real time communication for WSN.

Keywords: Duty cycle, RSS, PLE, FDMA, TDMA, WSN, Cluster

[1]. IEEE Standard 802.15.4: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area Networks (LR-WPANs), 2003.
[2]. A. Bachir, M. Dohler, T. Watteyne, and K. K. Leung, "MAC Essentials for Wireless Sensor Networks," IEEE Communications Surveys and Tutorials, vol. 12, no. 2, pp. 222-248, 2010.
[3]. Paramvir Bahl and Venkata N. Padmanabhan, "RADAR: An InBuilding RF-based User Location and Tracking System,", In the Proc. of IEEE Infocom, vol. 2, pp.775-784, Mar. 2000.
[4]. Veljo Otsason, Alex Varshavsky, Anthony LaMarca, and Eyal de Lara, "Accurate GSM Indoor Localization,", In the Proc. of UbiComp, pp.272-287, Sep. 2005.
[5]. Shwetak N. Patel, Khai N. Truong, and Gregory D. Abowd, "PowerLine Positioning: A Practical Sub-Room-Level Indoor Location System for Domestic Use,", In the Proc. of UbiComp, pp. 441-458, Sep. 2006.

ABSTRACT: An Ad-Hoc network deals with the collection of mobile nodes without any centralized structure. This can be well suited for environment where changes are frequent and establishment of infrastructure is not very cost effective. In short it can turn the dream of 'anytime anywhere' into reality[1]. Here we deal with the VHDL implementation of DSDV(destination sequenced distance vector) routing protocol to fulfill these requirements of Ad-hoc network more effectively.
Keywords: Adhoc, DSDV,FPGA,VHDL,Routing.

[1]. P. Ramamoorthy , A. Shanmugametal, 'Performance Analysis of Congestion Aware Distance Vector Routing Protocol in MANET', International Journal of Systemics, Cybernetics and Informatics, pp-78 to 80, January 2006.
[2]. J. Broch, D. Maltz, D. Johnson, Y.C.Hu, and J. Jetcheva, 'A Performance Comparison of Multi-hop Wireless Ad-hoc Network Routing Protocols', Proc. Of Mobicom 1998, pp.85-97.
[3]. M. Ramakrishnan, Dr. S. Shanmugavel, 'New Approaches to Routing Techniques of MANET Node for Optimal Network Performance', IJCSNS International Journal of Computer Science and Network Security, VOL.8 No.11, November 2008.
[4]. M. Ramakrishnan, Dr. S. Shanmugavel, 'FPGA Implementation of DSDV Based Router In Mobile Ad-hoc Network', IEEE, ICIIS, August 2006, Sri Lanka.
[5]. Charles E. Perkins and Pravin Bhagwat, 'Highly Dynamic Destination Sequenced Distance Vector Routing for Mobile Computers' In Proceedings of the SIGCOMM '94 Conference pages 234-244, August 1994.

ABSTRACT:The study assessed the perceived effects of Facebook on academic activities of Agricultural students in the University of Port Harcourt, Nigeria. Data were collected with the use of structured questionnaire from randomly selected 80 agriculture students and analyzed using descriptive statistical tools namely frequency, mean and percentages. Result shows that 64% of the agriculture students were females and fall mostly (87.4%) within the age brackets of 21-30years. Facebook (94%), blackberry messenger (90%) and Whatsapp (72.5%) were found to be the most frequently used social media by the students. Result on frequency of use of facebook shows that students visit facebook page mainly once in three days (60%). Majority (60%) spends an hour or less on Facebook daily while the major action mostly performed is chatting (36.25%). The agriculture students agree that facilitation of networking with other agric students (Mean = 3.00), collaboration with other students (Mean = 3.00 and ease of information flow ( Mean = 3.41) were the major effects of facebook on their academic activities. The overall rating of effect of facebook shows that facebook affect the academic activities of agriculture students positively (67%). Based on the findings of the study, it was recommended that the positive effect of facebook among students should be encouraged while the excessive use of facebook for recreational purposes should be discouraged. Keywords: Facebook, perceived effects, agriculture students

[1]. Arnold, N., & Paulus, T. (2010). Using a social networking site for experiential learning: Appropriating, lurking, modeling and community building. Internet and Higher Education, Vol 13, Pp188-196.
[2]. Asemah, E.S and Edegoh, L.O.N. (2013). Influence of new media sexual contents on the sexual behaviour of Kogi State University Students. Journal of Research and Contemporary Issues. Vol. 7 (1& 2).
[3]. Asemah, E.S, Okpanachi, R.A and Edegoh, LO.O.N (2013). Influence of social media on the academic performance of undergraduste students of kogi state university, Anyigba. Research Humanities and social sciences. Vol 3(12)
[4]. Chen, B., & Bryer, T. (2012). Investigating instructional strategies for using social media in formal and informal learning. International Review of Research in Open and Distance Learning, 13(1), 87-104. Retrieved fromhttp://www.irrodl.org/index.php/irrodl/article/view/1027/2073