Communication network analysis of the enterprise grid systems

This paper addresses the problem of performance analysis based on communication modelling of largescale heterogeneous distributed systems with emphases on enterprise grid computing systems. The study of communication layers is important because the overall performance of a distributed system is often critically hinged on the effectiveness of this part. This model considers processor as well as network heterogeneity of target system. The model is validated through comprehensive simulation, which demonstrates that the proposed model exhibits a good degree of accuracy for various system sizes and under different working conditions. The proposed model is then used to investigate the performance analysis of typical systems.

Secure connectivity model in wireless sensor networks (WSN) using first order Reed-Muller codes

In this paper, we suggest the idea of separately treating the connectivity and communication model of a Wireless Sensor Network (WSN). We then propose a novel connectivity model for a WSN using first order Reed-Muller Codes. While the model has a hierarchical structure, we have shown that it works equally well for a Distributed WSN. Though one can use any communication model, we prefer to use the communication model suggested by Ruj and Roy [1] for all computations and results in our work. Two suitable secure (symmetric) cryptosystems can then be applied for the two different models, connectivity and communication respectively. By doing so we have shown how resiliency and scalability are appreciably improved as compared to Ruj and Roy [1].

Medication communication during handover interactions in specialty practice settings

AIMS AND OBJECTIVES: To investigate what and how medication information is communicated during handover interactions in specialty hospital settings. BACKGROUND: Effective communication about patients' medications between health professionals and nurses at handover is vital for the delivery of safe continuity of care. DESIGN: An exploratory qualitative design and observational study. METHODS: Participant observation was undertaken at a metropolitan Australian public hospital in four specialty settings: cardiothoracic care, intensive care, emergency care and oncology care. A medication communication model was applied to the data and thematic analysis was performed. RESULTS: Over 130 hours of observational data were collected. In total, 185 (predominately nursing) handovers were observed across the four specialty settings involving 37 nurse participants. Health professionals communicated partial details of patients' medication regimens, by focusing on auditing the medication administration record, and through the handover approach employed. Gaps in medication information at handover were evident as shown by lack of communication about detailed and specific medication content. Incoming nurses rarely posed questions about medications at handover. CONCLUSIONS: Handover interactions contained restricted and incomplete medication information. Improving the transparency, completeness and accuracy of medication communication is vital for optimising patient safety and quality of care in specialty practice settings. RELEVANCE TO CLINICAL PRACTICE: For nurses to make informed and rapid decisions regarding appropriate patient care, information about all types of prescribed medications is essential, which is communicated in an explicit and clear way. Jargon and assumptions related to medication details should be minimised to reduce the risk of misunderstandings. Disclosure of structured medication information supports nurses to perform accurate patient assessments, make knowledgeable decisions about the appropriateness of medications and their doses, and anticipate possible adverse events associated with medications. In addition, benefits of patient and family member contributions in communicating about medications at handover should also be considered.

Performance of smart antennas with receive diversity in wireless sensor networks

In this paper we propose a Geometrically Based Single Bounce Elliptical Model (GBSBEM) for multipath components involving randomly placed scatterers in the scattering region with sensors deployed on a field. The system model assumes a cluster based wireless sensor network (WSN) which collects information from the sensors, filters and modulates the data and transmit it through a wireless channel to be collected at the receiver. We first develop a GBSBE model and based on this model we develop our channel model. Use of Smart antenna system at the receiver end, which exploits various receive diversity combining techniques like Maximal Ratio Combining (MRC), Equal Gain Combining (EGC), and Selection Combining (SC), adds novelty to this system. The performance of these techniques have been proved through matlab simulations and further ahead based on different number of antenna elements present at the receiver array, we calculate the performance of our system in terms of bit-error-rate (BER). Based on the transmission power we quantify for the energy efficiency of our communication model.

Place-based knowledge networks : the case of water management in South-West Victoria, Australia

This article aims to investigate the need for effective exchanges between knowledge generators and knowledge users in water management. Firstly, we explore the use of adaptive management for water governance and then outline the communication issues of water-management knowledge at a regional scale. Central to this approach is the need to harness 'local' knowledge that can be used to develop community participation in local water governance. Accordingly, we propose a three-network communication model to illustrate the process and identify the issues of concern for developing place-based strategies. Since research plays a central role in knowledge generation, one of the first ways to proceed is to recognise local research and incorporate it into an inclusive decision-making process. One way to achieve this is through the development of regional networks that are openly available to all, and we explore this by focusing on the place of 'network thinking' at local scale using a newly developed regional network for local knowledge dissemination in south-west Victoria, Australia. We conclude that so far this new network is too heavily reliant upon one web-based tool and outline a broader range of strategies that can be used to achieve its aims.

An agent architecture for managing data resources in a grid environment

The agent paradigm has been successfully used in a large number of research areas. MAPFS, a parallel file system, constitutes one successful application of agents to the I/O field, providing a multiagent I/O architecture. The use of a multiagent system implies coordination and cooperation among its agents. MAPFS is oriented to clusters of workstations, where agents are applied in order to provide features such as caching or prefetching. The adaptation of MAPFS to a grid environment is named MAPFS-Grid. Agents can help to increase the performance of data-intensive applications running on top of the grid.

This paper describes the conceptual agent framework and the communication model used in MAPFS-Grid, which provides the management of data resources in a grid environment. The evaluation of our proposal shows the advantages of using agents in a data grid.

Multi-input-multi-output antennas for radio frequency identification systems

In this chapter the authors discuss the physical insight of the role of wireless communication in RFID systems. In this respect, this chapter gives a brief introduction on the wireless communication model followed by various communication schemes. The chapter also discusses various channel impairments and the statistical modeling of fading channels based on the environment in which the RFID tag and reader may be present. The chapter deals with the fact that the signal attenuations can be dealt with up to some level by using multiple antennas at the reader transmitter and receiver to improve the performance. Thus, this chapter discusses the use of transmit diversity at the reader transmitter to transmit multiple copies of the signal. Following the above, the use of receiver combining techniques are discussed, which shows how the multiple copies of the signal arriving at the reader receiver from the tag are combined to reduce the effects of fading. The chapter then discusses various modulation techniques required to modulate the signal before transmitting over the channel. It then presents a few channel estimation algorithms, according to which, by estimating the channel state information of the channel paths through which transmission takes place, performance of the wireless system can be further increased. Finally, the Antenna selection techniques are presented, which further helps in improving the system performance.

Complex network theoretical analysis on information dissemination over vehicular networks

How to enhance the communication efficiency and quality on vehicular networks is one critical important issue. While with the larger and larger scale of vehicular networks in dense cities, the real-world datasets show that the vehicular networks essentially belong to the complex network model. Meanwhile, the extensive research on complex networks has shown that the complex network theory can both provide an accurate network illustration model and further make great contributions to the network design, optimization and management. In this paper, we start with analyzing characteristics of a taxi GPS dataset and then establishing the vehicular-to-infrastructure, vehicle-to-vehicle and the hybrid communication model, respectively. Moreover, we propose a clustering algorithm for station selection, a traffic allocation optimization model and an information source selection model based on the communication performances and complex network theory.

Supportng Chinese distance learners through computer-mediated communication- revisting Salmon`s model

Salmon’s (2000) proposed model for the effective development of on-line communication and collaboration between student suggests that on-line socialisation forms an early and important component of establishing required levels of comfort and skill. In this paper we review research with Chinese learners that suggests that some adjustments to Salmon’s model may be advisable for these students. Specifically, the model is redeveloped to provide a more structured experience, and to use that structure to develop online skills, such that comfortable socialisation is seen as an end-point rather than as an early enabler.

Analytical communication networks model for enterprise grid computing

This paper addresses the problem of performance analysis based on the communication modeling of large-scale heterogeneous distributed systems, with an emphasis on enterprise Grid computing systems. The study of communication layers is important, as the overall performance of a distributed system often critically hinges on the effectiveness of this part. We propose an analytical model that is based on probabilistic analysis and queuing networks. The proposed model considers the processor as well as network heterogeneity of the enterprise Grid system. The model is validated through comprehensive simulations, which demonstrate that the proposed model exhibits a good degree of accuracy for various system sizes, and under different working conditions.

A model of superiors and subordinates' aggressive communication in the workplace

In the workplace, superiors and subordinates may engage in a spiral of aggressive communication and emotional reaction that can lead to negative attitudes and unproductive organisational outcomes and higher staff turnover. In the manuscript, we develop and propose a model of superiors' and subordinates' aggressive communication and emotional reactions. In our model we suggest that organisational context (culture) and individual personal characteristics (personality, trust, self-esteem) influence superiors' and subordinates' aggressive communication. We also suggest that individual emotional characteristics (positive/negative affect, emotional intelligence) influence the protagonists' emotional reactions. Finally, we propose that subordinates' emotional reactions and organisational culture influence their attitudes (organisational identity, perception of a masculine vs. feminine organisation) and their considered behaviours (performance, turnover). We conclude with a discussion of potential limitations, and implications for theory, research, and practice.

Understanding cross-cultural negotiation : A model integrating affective events theory and communication accommodation theory

Business interactions are increasingly crossing boundaries. Boundary crossing is a process of joining or parting people. Negotiation is the media of this process. This paper is an attempt to bridge the boundaries of strategic business negotiation, communication and emotion in a cross-cultural context. In particular, we argue that miscommunications are ‘boundary crossing mishaps’. Such mishaps are affected by negotiators’ understanding of the respective cultures of the parties, negotiation skill, affective cultural background of the parties, cultural differences, emotional awareness and regulation, negative affect and discrepancy in convergence divergence between the interactants. When too many of these hassles or mishaps occur, negotiation breaks down. In this way, it is the accumulation of many little things, many little misunderstandings, that break negotiation.