Towards generic satellite payloads: software radio

Satellite payloads are becoming much more complex with the evolution towards multimedia applications. Moreover satellite lifetime increases while standard and services evolve faster, necessitating a hardware platform that can evolves for not developing new systems on each change. The same problem occurs in terrestrial systems like mobile networks and a foreseen solution is the software defined radio technology. In this paper we describe a way of introducing this concept at satellite level to offer to operators the required flexibility in the system. The digital functions enabling this technology, the hardware components implementing the functions and the reconfiguration processes are detailed. We show that elements of the software radio for satellites exist and that this concept is feasible

Development of Economic Water Usage Sensor and Cyber-Physical Systems Co-Simulation Platform for Home Energy Saving

In this thesis, two Cyber-Physical Systems (CPS) approaches were considered to reduce residential building energy consumption. First, a flow sensor was developed for residential gas and electric storage water heaters. The sensor utilizes unique temperature changes of tank inlet and outlet pipes upon water draw to provide occupant hot water usage. Post processing of measured pipe temperature data was able to detect water draw events. Conservation of energy was applied to heater pipes to determine relative internal water flow rate based on transient temperature measurements. Correlations between calculated flow and actual flow were significant at a 95% confidence level. Using this methodology, a CPS water heater controller can activate existing residential storage water heaters according to occupant hot water demand. The second CPS approach integrated an open-source building simulation tool, EnergyPlus, into a CPS simulation platform developed by the National Institute of Standards and Technology (NIST). The NIST platform utilizes the High Level Architecture (HLA) co-simulation protocol for logical timing control and data communication. By modifying existing EnergyPlus co-simulation capabilities, NIST’s open-source platform was able to execute an uninterrupted simulation between a residential house in EnergyPlus and an externally connected thermostat controller. The developed EnergyPlus wrapper for HLA co-simulation can allow active replacement of traditional real-time data collection for building CPS development. As such, occupant sensors and simple home CPS product can allow greater residential participation in energy saving practices, saving up to 33% on home energy consumption nationally

Corporate governance and the protection of investors: A comparative and critical perspective on the legal responses to the ultimate concern and on potential developments

This paper, after reviewing the mechanisms for the direct and indirect protection of minority shareholders in the US, France, Germany and the UK, assesses these machanisms in light of a "subjective" aspect of minority shareholders protection (protection of weaker shareholders vs. stronger shareholders and/or management) and in light of an "objective" aspect of minority shareholders protection (conditions for the long-term success of the company) that can both be extrapolated from the OECD Principles. In this assessment, the paper, after evidencing the factors pushing towards formal convergence both within the EC and at the wider international level, and the need for functional convergence, calls into discussion the usefulness itself of international comparisons based on the formal rules in place in one jurisdiction commonly used as a yardstick, and suggests that a new minority shareholders protection index could be identified, taking into consideration both the subjective aspect and the objective aspect of investors protection