Network Coding: Connections Between Information Theory And Estimation Theory

In this paper, we prove the existence of fundamental relations between information theory and estimation theory for network-coded flows. When the network is represented by a directed graph G=(V, E) and under the assumption of uncorrelated noise over information flows between the directed links connecting transmitters, switches (relays), and receivers. We unveil that there yet exist closed-form relations for the gradient of the mutual information with respect to different components of the system matrix M. On the one hand, this result opens a new class of problems casting further insights into effects of the network topology, topological changes when nodes are mobile, and the impact of errors and delays in certain links into the network capacity which can be further studied in scenarios where one source multi-sinks multicasts and multi-source multicast where the invertibility and the rank of matrix M plays a significant role in the decoding process and therefore, on the network capacity. On the other hand, it opens further research questions of finding precoding solutions adapted to the network level.Comment: IEEE Wireless Communications and Networking Conference (WCNC), April, 201

Piggybacking Codes for Network Coding: The High/Low SNR Regime

We propose a piggybacking scheme for network coding where strong source inputs piggyback the weaker ones, a scheme necessary and sufficient to achieve the cut-set upper bound at high/low-snr regime, a new asymptotically optimal operational regime for the multihop Amplify and Forward (AF) networks

Accountability and Moral Competence Promote Ethical Leadership

Accountability and moral competence are two factors that may have a positive effect on ethical leadership in organizations. This study utilized a survey methodology to investigate the relationship among accountability, moral competence and ethical leadership in a sample of 103 leaders from a variety of industries and different countries. Accountability was found to be a significant positive predictor of ethical leadership. Moral competence was also found to moderate this relationship such that increases in moral competence enhanced the positive effects of accountability on ethical leadership. The results of the study suggest that organizations can increase ethical leadership throughout the company via accountability (especially self-accountability) and moral competence by training their leaders to use self-monitoring behaviors and increasing moral education

Botanical gardens as objects of metropolises for ecological tourism

Botanical gardens are becoming more important in the planning of modern metropolises and major urban concentrations, because they can function as recreational and educational facilities to the general public in addition to their importance in the environmental aspect of big cities. This paper approaches the issue of the botanical garden in the Ural region and its role in preserving the ecological system

The intervening impact of mas effectiveness on the relationship between contingent variables and organization performance: a study of Libyan banking and petroleum organizations. / Naser Bashir A. Ghanem

This study is undertaken with the purpose of examining the relationship between management accounting system effectiveness (MASE) and organization performance (OP). Specifically the research seeks to figure out what are the benefits derived from MAS that OP could have from what expected to be the main influences in MASE. Moreover, the research concentrates on MASE that resulted from contingent factors, organizational coordination and control requirements (OCCR) and information quality IQ. In particular, examine the effect of MASE arising from OCCR and IQ on OP with regard to individual impact (INIM) in developing countries’ concept, the case of Libya. More specifically, IQ as one of the MAS requirement and OCCR which consist of information interdependence (INFIN), formalization (FO) and information inter-organization (INFORG) are the selected contingent variables, with MASE modelled as intervening mechanism between these contingent variables, and OP. This study also looks for evidences about the effectiveness of suitability of MAS’ information from system users’ perspective (perceptions of MAS’s end users such as CEOs). Previous researchers have realized the contribution of information technology (IT) in improving the individual performance chiefly in terms of productivity and effectiveness (Iivari, 2005a). The study is beneficial and significant because it supports the need to consider individual and environmental factors together. The expected outcome of the research is that MASE that rose from the impact of the contingent variables has a direct positive impact on OP. Also the relation between system effectiveness and performance may effected by INIM

Energy Efficient Adaptive Network Coding Schemes for Satellite Communications

In this paper, we propose novel energy efficient adaptive network coding and modulation schemes for time variant channels. We evaluate such schemes under a realistic channel model for open area environments and Geostationary Earth Orbit (GEO) satellites. Compared to non-adaptive network coding and adaptive rate efficient network-coded schemes for time variant channels, we show that our proposed schemes, through physical layer awareness can be designed to transmit only if a target quality of service (QoS) is achieved. As a result, such schemes can provide remarkable energy savings.Comment: Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 24 March 201