Performance evaluation of two-fuzzy based cluster head selection systems for wireless sensor networks

Sensor networks supported by recent technological advances in low power wireless communications along with silicon integration of various functionalities are emerging as a critically important computer class that enable novel and low cost applications. There are many fundamental problems that sensor networks research will have to address in order to ensure a reasonable degree of cost and system quality. Cluster formation and cluster head selection are important problems in sensor network applications and can drastically affect the network’s communication energy dissipation. However, selecting of the cluster head is not easy in different environments which may have different characteristics. In this paper, in order to deal with this problem, we propose two fuzzy-based systems for cluster head selection in sensor networks. We call these systems: FCHS System1 and FCHS System2. We evaluate the proposed systems by simulations and have shown that FCHS System2 make a good selection of the cluster head compared with FCHS System1 and another previous system.Peer ReviewedPostprint (published version

Implementation of CAVENET and its usage for performance evaluation of AODV, OLSR and DYMO protocols in vehicular networks

Vehicle Ad-hoc Network (VANET) is a kind of Mobile Ad-hoc Network (MANET) that establishes wireless connection between cars. In VANETs and MANETs, the topology of the network changes very often, therefore implementation of efficient routing protocols is very important problem. In MANETs, the Random Waypoint (RW) model is used as a simulation model for generating node mobility pattern. On the other hand, in VANETs, the mobility patterns of nodes is restricted along the roads, and is affected by the movement of neighbour nodes. In this paper, we present a simulation system for VANET called CAVENET (Cellular Automaton based VEhicular NETwork). In CAVENET, the mobility patterns of nodes are generated by an 1-dimensional cellular automata. We improved CAVENET and implemented some routing protocols. We investigated the performance of the implemented routing protocols by CAVENET. The simulation results have shown that DYMO protocol has better performance than AODV and OLSR protocols.Peer ReviewedPostprint (published version

The University of Alaska Anchorage experience

In the fall 2005, when two faculty librarians at the University of Alaska Anchorage’s (UAA) Consortium Library realized that three people on the library staff were enrolled in library school, they saw the perfect opportunity to start a discussion group that would benefit both currently employed librarians and students entering the information field. The original three students were enrolled in the MLIS distance program at the University of Washington, working in the Consortium Library, and taking classes part-time. The two faculty librarians had been out of library school for more than ten years by then, so the intent was to organize a forum with an informal, relaxed atmosphere that would be an engaging way to keep up with current curricula, to learn about class projects the students were working on, and to hear about their experiences. While the librarians learned from the students, the students could, in turn, share their new expertise with the library faculty. That was the beginning of what came to be known as FLIP: Future Library and Information Science People.1 Now, nearly seven years later, FLIP is still going strong. What the name stands for has changed slightly—to Future Librarians and Information Professionals—and the membership has expanded to include anyone considering a career as a librarian or enrolling in an MLS or MLIS program. Characterizing FLIP as a “mentoring” program misses the mark, since so much more than just mentoring is happening. Because the benefits go both ways, we prefer the term “un-mentoring” to describe FLIP. Regardless of its definition or description, however, the original purpose remains the same: to provide an informal discussion forum that enriches library school studies with librarian expertise, advice, and insight

Enforcing reputation constraints on business process workflows

The problem of trust in determining the flow of execution of business processes has been in the centre of research interst in the last decade as business processes become a de facto model of Internet-based commerce, particularly with the increasing popularity in Cloud computing. One of the main mea-sures of trust is reputation, where the quality of services as provided to their clients can be used as the main factor in calculating service and service provider reputation values. The work presented here contributes to the solving of this problem by defining a model for the calculation of service reputa-tion levels in a BPEL-based business workflow. These levels of reputation are then used to control the execution of the workflow based on service-level agreement constraints provided by the users of the workflow. The main contribution of the paper is to first present a formal meaning for BPEL processes, which is constrained by reputation requirements from the users, and then we demonstrate that these requirements can be enforced using a reference architecture with a case scenario from the domain of distributed map processing. Finally, the paper discusses the possible threats that can be launched on such an architecture

2010-2011 Drake Memorial Library Annual Report

The 2010-2011 annual report of Drake Memorial Library of The College at Brockport, as compiled by Mary Jo Orzech, Bob Cushman, Pam O\u27Sullivan and Jennifer Smathers with contributions from the Drake Faculty and Staff

Mandatory Audit Firm Rotation and Audit Quality in Zimbabwe

This research was intended to assess the effects of Mandatory audit firm rotation on audit quality in Zimbabwe. The suspicion that auditors’ independence has been compromised as some companies do not rotate their auditors has prompted the researcher to carry out this study. The focus of this study, objectives, were to identify the effects of Mandatory audit firm rotation on audit quality, to determine the effects of audit tenure length on audit quality and to suggest measures that can be put in place to promote Mandatory audit firm rotation. A descriptive research design was adopted as it provides a picture of a situation as it naturally happens. A sample of 33 companies was selected out of the study population of 77 companies which is made up of 15 auditing firms listed on ZSE directory under category of auditing service and 62 companies which represented all the firms that are listed on the Zimbabwe Stock Exchange. Primarydata was collected using questionnaires whereas secondary data was mainly collected from journals and other prior researchers work.  Pearson regression and correlation analysis from the SPSS revealed that there is a strong positive linear relationship between Mandatory audit firm rotation and audit quality, while a strong negative correlation of existsbetween the length of audit tenure and audit quality. The study also reveal that that law enforcement, conducting workshops and training stakeholders are the possible measures that can be put in place to promote mandatory audit firm rotation. Keywords: Mandatory audit rotation, Audit tenure, Audit quality.

Software Defined Networks based Smart Grid Communication: A Comprehensive Survey

The current power grid is no longer a feasible solution due to ever-increasing user demand of electricity, old infrastructure, and reliability issues and thus require transformation to a better grid a.k.a., smart grid (SG). The key features that distinguish SG from the conventional electrical power grid are its capability to perform two-way communication, demand side management, and real time pricing. Despite all these advantages that SG will bring, there are certain issues which are specific to SG communication system. For instance, network management of current SG systems is complex, time consuming, and done manually. Moreover, SG communication (SGC) system is built on different vendor specific devices and protocols. Therefore, the current SG systems are not protocol independent, thus leading to interoperability issue. Software defined network (SDN) has been proposed to monitor and manage the communication networks globally. This article serves as a comprehensive survey on SDN-based SGC. In this article, we first discuss taxonomy of advantages of SDNbased SGC.We then discuss SDN-based SGC architectures, along with case studies. Our article provides an in-depth discussion on routing schemes for SDN-based SGC. We also provide detailed survey of security and privacy schemes applied to SDN-based SGC. We furthermore present challenges, open issues, and future research directions related to SDN-based SGC.Comment: Accepte

Future Ground-Based Gravitational-Wave Observatories: Synergies with Other Scientific Communities

Planning for the development of a 3rd generation global gravitational-wave detector array is a multifaceted and complex effort that will necessarily need a high level of community input. Interfacing to extant and new stakeholders in the broader scientific constituencies is necessary to keep them aware of the activities taking place in the ground-based gravitational-wave community and receive input to inform and evolve the planning. In this report, we present the approaches GWIC and gravitational-wave collaborations and projects should consider taking to engage with broader community. This report is the fifth in a six part series of reports by the GWIC 3G Subcommittee: i) Expanding the Reach of Gravitational Wave Observatories to the Edge of the Universe, ii) The Next Generation Global Gravitational Wave Observatory: The Science Book, iii) 3G R&D: R&D for the Next Generation of Ground-based Gravitational Wave Detectors, iv) Gravitational Wave Data Analysis: Computing Challenges in the 3G Era, v) Future Ground-based Gravitational-wave Observatories: Synergies with Other Scientific Communities (this report), and vi) An Exploration of Possible Governance Models for the Future Global Gravitational-Wave Observatory Network

Implementation and performance evaluation of two fuzzy-based handover systems for wireless cellular networks

Wireless mobile networks and devices are becoming increasingly popular to provide users the access anytime and anywhere. We are witnessing now an unprecedented demand for wireless networks to support both data and real-time multimedia traffic. The wireless mobile systems are based on cellular approach and the area is covered by cells that overlap each other. In mobile cellular systems the handover is a very important process. Many handover algorithms are proposed in the literature. However, to make a better handover and keep the QoS in wireless networks is very difficult task. For this reason, new intelligent algorithms should be implemented to deal with this problem. In this paper, we carried out a comparison study of two handover systems based on fuzzy logic. We implement two Fuzzy-Based Handover Systems (FBHS) called FBHS1 and FBHS2. The performance evaluation via simulations shows that FBHS2 has better behavior than FBHS1 and can avoid ping-pong effect in all simulation cases.Peer ReviewedPostprint (published version