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A public version of the software is available on request from the authors.

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SUMMARYIn this paper, an analytical model is proposed to calculate the network throughput of dedicated control channel protocols that are designed to schedule multiple packets to be transmitted on different data channels simultaneously. Based on the analytical model, a scheme by tuning the initial contention window size is proposed to maximize the network throughput. We also present a novel multi-channel MAC protocol for single-hop scenario. Simulation results show that the proposed model is capable of modeling the behaviors of dedicated control channel protocols accurately. Furthermore, the proposed scheme can reduce the cost of collisions and enhance the network throughput up to 22% for 1 kB packet size and 80 nodes. Compared with other dedicated control channel protocols, the proposed protocol can schedule more control packets and use multiple channels more efficiently.

A large number of researchers, academia, government sectors, and business enterprises are adopting the cloud environment due to the least upfront capital investment, maximum scalability, and several other features of it. Despite the multiple features supported by the cloud environment, it also suffers several challenges. Data protection is the primary concern in the area of information security and cloud computing. Numerous solutions have been developed to address this challenge. However, there is a lack of comprehensive analysis among the existing solutions and a necessity emerges to explore, classify, and analyze the significant existing work for investigating the applicability of these solutions to meet the requirements. This article presents a comparative and systematic study, and in-depth analysis of leading techniques for secure sharing and protecting the data in the cloud environment. The discussion about each dedicated technique includes: functioning for protecting the data, potential and revolutionary solutions in the domain, the core and adequate information including workflow, achievements, scope, gaps, future directions, etc. about each solution. Furthermore, a comprehensive and comparative analysis of the discussed techniques is presented and the research gaps and future directions are reported in the field. The authors believe that this article's contribution will operate as a catalyst for the potential researchers to carry out the research work in the area.

This work presents a band‐notched ultra‐wideband (UWB) circular slot antenna free from interference with existing wireless systems. The antenna has an indented circular stub embedded inside the circular slot. The desired band‐notched UWB operation can be obtained by choosing the size of the pie‐slot cut in the circular stub. Details of the proposed design and experimental results of the constructed antennas are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2444–2446, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21958

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