The weakness of the orthogonal freuency division multiplexing (OFDM) system is susceptible to the existence of carrier frequency offset (CFO) which causes the emergence of inter carrier interference (ICI) which causes a degradation of performance OFDM systems. This study aims to apply the suggested rectangular (REC) pulse and improved sinc-power (ISP) pulse shaping methods on OFDM system and determines ICI reduction with the effects of CFO over flat fading Rayleigh channels. The performance of each pulse shaping method is evaluated and compared based on parameter ICI power vs. normalized frequency offset, signal to interference ratio (SIR) vs. normalized frequency offset and bit error rate (BER) vs. energy bit per noise (Eb/No). The simulation result in terms of BER vs. Eb/No indicated that REC and ISP pulse shaping has better performance dealing with ICI reduction compared to OFDM system no applied pulse shaping. In addition, the ISP is able to mitigate ICI better than REC.

Evaluation of bids by WG ULP has an important role in the selection of providers of construction work to determine the potential winner. A group decision support system is a system that can help the Working Group ULP Bali provincial government in making decisions with the ability to analyze the construction work provider selection criteria with AHP and Borda method. With GDSS bid evaluation, all members of the Working Group can evaluate the ULP provider offering construction work optimally based on the criteria of administrative, technical prices so as to improve the quality of the repair process of group decision-making. Both methods are used because there are two stages in the decision-making that decision of individual and group decision. The test results show that the system can be applied GDSS as decision support systems in the bid evaluation provider of construction work and decided the company's most worthy to be a winner

This paper presents an innovative application of wireless, mobile and ubiquitous technologies to support informal and collaborative learning in Kenyan rural farming communities. Such an approach is achieved by the development of a Knowledge Management System (KMS) integrated with existing local community communication channels, together with experimental Knowledge Management (KM) initiatives employing the VeSeL (Village e-Science for Life) distributed resource kits (DRKs). The initiatives support illiterate and semiliterate farming community groups, in learning new agriculture practices, and also enable the use of advanced digital technology to improve their agricultural practices and literacy levels. Results of a recent field trip to Kenya are presented and an application sketch is developed. The process of applying wireless and Internet technologies for the education of local farming communities, using irrigation and water management as the application, concludes the paper.

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Nowadays the use of TCP / IP networks at this time is very crucial, where almost all companies, government and private agencies depend on this network to facilitate business and communication to grow up the companies. Network failure caused by link failure or devices failure is very intolerable because it will disrupt business and communication activities that last 24 days, 7 days a week. To overcome the problem of network failure this study is using three methods which will be discussed, namely: VRRP, HSRP and GLBP. It is expected that the use of these three methods can provide a solution to overcome network failures for the smooth running of business and telecommunications activities. The results of the tests that have been done, GLBP method looks better when compared to the VRRP and HSRP methods, especially in testing packet loss and throughput.