List of Articles افزایش

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  1 - Parametric analysis of a broadband Archimedean spiral antenna with cavity
  Hamed  noroozy Shahrokh  jam
  In this article an Archimedean spiral antenna is designed and analyzed that has good operation in broadband application. By analyzing this design, the effects that different parameters have on antenna operation will be studied and ways of optimization will be found.  In More

  In this article an Archimedean spiral antenna is designed and analyzed that has good operation in broadband application. By analyzing this design, the effects that different parameters have on antenna operation will be studied and ways of optimization will be found.  Influences of cavity height and number of turns to obtain good matching and gain in a frequency interval of 4 to 18 GHz will be discussed. In addition, using cavity wall around the antenna, side lobes are decreased or deleted. By tapering the arms at feeding center, better matching will be attained. For making S11 bandwidth better, increasing the cavity height or reducing the number of turns can be used. Changing number of turns does not have a significant effect on the gain. To improve the antenna gain, the cavity height needs to be adjusted such that the reflected wave from cavity and radiated wave from spiral arms are constructing. Manuscript profile
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  2 - Increasing the value of collected data and reducing energy consumption by using network coding and mobile sinks in wireless sensor networks
  ehsan kharati
  The wireless sensor network includes a number of fixed sensor nodes that move sink nodes to collect data between nodes. To reduce energy consumption and increase the value of collected data, it is necessary to determine the optimum route and residence location of mobile More

  The wireless sensor network includes a number of fixed sensor nodes that move sink nodes to collect data between nodes. To reduce energy consumption and increase the value of collected data, it is necessary to determine the optimum route and residence location of mobile sinks, which increases the life of wireless sensor networks. Using network coding, this paper presents a Mixed Integer Linear Programming Model to determine the optimal multicast routing of source sensor nodes to mobile sinks in wireless sensor networks, which determines the time and location of sinks to collect maximum coded data and reduces the delay in sink movement and energy consumption. Solving this problem in polynomial time is not possible due to the involvement of various parameters and the constrained resources of wireless sensor networks. Therefore, several exploratory and greedy and fully distributed algorithms are proposed to determine the movement of sinks and their residence location based on maximizing the value of coded data and the type of data dead time. By simulating, the optimal method and the use of coding and proposed algorithms, reduce the runtime and energy consumption and increase the value of collected data and network lifetime than non-coding methods. Manuscript profile
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  3 - Investigating the Impact of Tourism in the Economic and Social Development of Rural Areas (Case Study: Villages in Talesh Township)
  samira asghary
  Abstract: Since the 1950s, attention has been paid to rural tourism, and the 1960s marked its economic aspect with respect to local communities and since the 1990s, new horizons have been created in the development of tourism and have been used as a tool for More

  Abstract: Since the 1950s, attention has been paid to rural tourism, and the 1960s marked its economic aspect with respect to local communities and since the 1990s, new horizons have been created in the development of tourism and have been used as a tool for the development of rural communities. So, today the most important tool for sustainable rural development is the use of tourism capacities, especially natural and cultural. Tourism development in villages, increase of job opportunities, creation of additional income and decentralization in rural areas leads to a lot of environmental and cultural benefits. The purpose of this study was to investigate the economic and social impacts of tourism development in the cities of Talesh province. In this research, villages of over 200 households and sample villages of the province have been surveyed. The research method is descriptive-analytical. The research data were obtained through library and information documents through a questionnaire and statistical documentation and field surveys. Due to the lack of reliable statistics about the number of tourists entering the area, 383 questionnaires were used using The Cochran formula was obtained during the springtime and spring seasonal periods.. The result of the research shows that in the above-mentioned sections, there is a meaningful relationship between the arrival of tourists and the creation of employment and income of rural communities. Due to the existence of unique natural attractions such as Gisum beaches, Alalan Khalifabad, taki tazeh abad,ghorough, Hawigh , Chubar and the beautiful road of Asalem to Khalkhal, , talesh to Marian, Lisar to Sutaban, and talesh to Sharsul, Investment and the creation of tourism infrastructure will have a major impact on the region's further development and sustainable employment. Manuscript profile