Latest Articles - Volume 9 No. 2

  • Improving WLAN Quality of Services (Qos) Using Opnet

    Ishwar Baidari1 , S. P. Sajjan2 and Ajeet Kumar Singh2

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    Wireless local area networks (WLANs) are in a period of great expansion and there is a strong need for them to support multimedia applications. With the increasing demand and penetration of wireless services, users of wireless networks now expect Quality of Service (QoS) and performance comparable to what is available from fixed networks. Providing QoS requirements like good throughput and minimum access delay are challenging tasks with regard to 802.11 WLAN protocols and Medium Access Control (MAC) functions.
    This research is done to study, the presently implemented schemes (the Point Coordination Function (PCF) of IEEE 802.11, the Enhanced Distributed Coordination Function (EDCF) of the proposed IEEE 802.11e extension to IEEE 802.11), solves these issues and what can be done to improve them further.  The metrics used were Throughput, Data Drop, Retransmission and Medium Access Delay, to analyze the performance of various MAC protocols in providing QoS to users of WLAN.
    Two scenarios, with same Physical and MAC parameters, one implementing the DCF and other EDCF, were created in the network simulation tool (OPNET MODELER) to obtain the results. The results showed that the performance of EDCF was better in providing QoS for real-time interactive services (like video conferencing) as compared to DCF, because of its ability to differentiate and prioritize various services. Index Terms - Wireless local area networks (WLANs),

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  • Load Balancing the Network Traffic in the Nth Mode of IP Tables

    Anupama*1 and O. P. Gupta2

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    In this paper, we present the network load balancing to optimize the network interfaces that are present in the cluster. We know, everything belongs to internet now a days. With the increase in the popularity of the web, network traffic increases and need for fast access to the internet is also on demand. For smooth services, redundancy of the servers is required. As a result, load balancing has become a very critical job. A single server is not able handle all the traffic which results into a server crash. Network is divided into different paths on which the transmission of packets is done. They are distributed on all the interfaces simultaneously. We investigate the performance of per-packet load balancing in different servers. Simulation results reveal that it is always beneficial to use load balancing and backup of other servers are always present in case of any failure in network.

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  • Application of Multi-Angle Imaging Spectro Radiometer in Agricultural in Middle Gujarat for Wheat Crop

    H. K. AHIR and B. M. Mote

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    The present analysis was carried out using the satellite image from the Multi-angle Imaging Spectro Radiometer (MISR) was acquired over Middle Gujarat on 9 and 18 February 2015. The MISR is one of the five instruments on board the EOS/ Terra spacecraft. The Rahaman-Pinty-Verstraete inversion and Forward semi-empirical three parameters leaf reflectance shape (rho0), the curve convexity (k) and the dominant forward scattering (Ɵ) model were used to simulate angular patterns of BRF for wheat on 18 February 2015. The potential of the RPV model to represent the BRF of leaves in the 400-1100 nm spectral range was investigated in this study. The results revealed that the variety of tests are shown in order to document and analyse software performance against simulated BRF fields by RPV anis view model as well as against actual MISR-derived satellite BRF was blue, green and red good match with each but mismatched with NIR and all MISR band blue, green and red and NIR for mature wheat.

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  • Fdi (Foreign Direct Investment) in India ; the Major Monetary Source for Economic Development With Special Emphasis on Computer Sector

    Bushra Sarwar

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    Foreign direct investment (FDI) is an investment in a business by an investor from another country for which the foreign investor has control over the company purchased. The need for foreign capital for a developing country like India could arise on account of the following reasons reasons. Foreign capital is usually essential atleast as temporary measure during the period of development. Foreign capital  usually  brings with it with other scarce productive factors like technical know how. Domestic capital is inadequate for purpose of the economic growth and it is necessary to invite foreign capital as per the requirement. At many times, domestic capital and entrepreneurship may not flow into certain lines of production. Foreign capital can show the way for domestic capital. There can be potential savings in a developing economy like India but this may come forward only at a higher level of economic activity. Therefore it is necessary that foreign capital should help in speeding up economic activity in the initial phase of development.

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  • Moodle (Electronic Learning System) Community

    Shathaghazal  and Raina Salkhlailah

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    Moodle(Electronic learning system )   is a learning platform designed to provide educators, administrators and learners with a single robust, secure and integrated system to create personalized learning environments. You can download the software onto web server .

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