Overcoming the liability of renewal at the Saudi Railway Sector

関西学院大

Overcoming the Liability of Renewal at the Saudi Railway Sector

関西学院大

Change of size and type of patent ductus arteriosus in a one year old infant during routine echocardiographic study

There are only very few publications which document reactivity of patent ductus arteriosus. This report documentes the reactivity of a patent arterial duct in a one year old infant, 6.5 kg weight during a routine echocardiographic color Doppler study. Echocardiographic images were obtained during conscious sedation.peer-reviewe

The effect of business process re-engineering (BPR) on performance of Water Works Construction Enterprise (WWCE)

Organizational processes today are markedly different than they were several years ago. Processes are what organizations do. When processes become old and inefficient and can’t deliver results that they were originally designed to, they can’t cope up the business dynamics in the environment in which they operate, they must be replaced. Business Process Reengineering (BPR) is a process-based management tool that can deliver, redesign or replace inefficient processes, as required, with a breakthrough results. As such it can be applied to a single process, a group of processes, or the entire processes comprising the organization. The Purpose of this study is to assess the effect of BPR on organizational performance of Water works construction enterprise (WWCE). In the study, both quantitative and qualitative data collection methods were employed. The data for current study were obtained from primary and secondary sources. The instrument used to gather data for quantitative study was questionnaire whereas for that of qualitative it was key informant interview. Documentary analysis was used to augment the primary data collection tools. Data were analyzed using descriptive statistics and inferential statistics. The findings have revealed that after BPR implementation there were increased employees’ satisfaction which may increase customer satisfaction and organizational performance. Finding related to major changes after implementation of BPR in the view of Employees and the data obtained from the interview and document review, one can conclude that there were major changes regarding behavior, team work and management system; but regarding radical change in the study area it was seen only an incremental improvement. And also employees have given benefits regarding salary increment, compensation, and empowerment. However, in the enterprise, there is no implementation of strong performance evaluation system. Based on the finding of the study it has been concluded that business process reengineering has become a useful weapon for any organization that is seeking for improvement in its current organizational performance and intends to achieve organizational objective. It is recommended that reengineering process remains effective tool for WWCE to achieve its objective and also organizations striving to operate effectively and efficiently

Delay-robust distributed secondary frequency control for next-generation power systems: Stability analysis and controller synthesis

Power systems worldwide are undergoing major transformation to enable a low-carbon future. These developments require new procedures for advanced control to ensure a stable and efficient system operation. Consensus-based distributed secondary frequency control schemes have the potential to ensure real-time frequency restoration and economic dispatch simultaneously in future power systems with significant contribution of renewable energy sources. However, owing to their distributed nature, these control schemes critically depend on communication between different controlled units. Thus, robustness against communication uncertainty is crucial for their reliable operation. In this work, control design and stability analysis of delay-robust secondary frequency control in next-generation power systems are studied. The main contributions of the present thesis can be summarised as follows: (i) A design procedure for a consensus-based secondary frequency controller in microgrids is proposed that ensures robustness with respect to heterogeneous fast-varying communication delays and simultaneously provides the option to trade off the L2-gain performance against the number of required communication links; (ii) The conditions for robust stability of a consensus-based frequency control scheme applied to a power system model with second-order turbine-governor dynamics in the presence of heterogeneous time-varying communication delays and dynamic communication topology are derived; (iii) The performance of the proposed consensus-based secondary frequency controller is analysed in a detailed model capturing the dynamic behaviour of a real system. The results provide insights to the robustness of the closed-loop system with respect to unmodelled (voltage and higher-order generator) dynamics as well as communication delays