Daniela Ghiculescu

Customer Matrix with Different Time Horizons Applied to Electrodischarge Machines

A very effective method to evaluate the products is the Customer Matrix (CM) that uses two coordinates: Perceived Used Value (PUV) and Perceived Price. Our researches extend this basic concept by adding the time variable, creating CM with different time horizons that assures a better understanding of competitive environment. In the first stage, the Customer Matrix is associated with a forecast method. The relevance tree method was used to predict the most probable evolution paths of electrodischarge machines. In the second stage, the CM with different time horizons is constructed, considering products evaluation for short, medium and long time. Finally, a strategy is conceived for an organization that attempts to ameliorate and consolidate its long term position against the main competitors, aiming at obtaining sustainable competitive advantage.

On Romanian SMEs Development Using Concentrated Energies Technologies Based on Updated Greiner's Model

The paper deals with an updated Greiners model, defining its final stage, Development through Alliance, in the frame of actual knowledge based economy, and with introduction and characterization of its final crisis, Incompatibility crisis. The research method is based on analysis of SMEs characteristics that use concentrated energies technologies, correlated with characteristics of actual economy. This led to some elements of the final stage of Greiners model, which were developed together with managerial methods of organizational development as well as solutions to avoid or ameliorate the final crisis of Incompatibility, applied to SMEs, using the approached technologies. It was also identified a trend concerning small and medium enterprises (SMEs) evolution from Romania, which use concentrated energies technologies. Some generic development solutions for the mentioned organizations in actual economy are provided.

Aspects of Finite Element Analysis of Microdrilling by Ultrasonically Aided EDM and Related Knowledge Management

Ultrasonic vibrations of electrode-tool and workpiece were applied successfully in specific cases to increase some parameters at micro-EDM, this working mode being characterized through machining instability due to vary narrow working gap. Our researches proved that all main technological parameters of micro-EDM can be improved by ultrasonic aiding (μEDM+US) in terms of machining rate, volumetric relative wear and surface roughness if some optimization conditions of working parameters are fulfilled. A multiphysics Finite Element Analysis (FEA) of material removal mechanism was achieved using two time dependent modules of Comsol 4.2 in order to attain the working parameters optimization. The FEA results compared to experimental data aiming at model validation led to some useful measures to optimize the working parameters. The knowledge management process was approached in order to suggest how human resource from an organization that uses μEDM+US can apply and improve the research results. Our EDM+US strategy is based on relative long pulse time with very low current overlapped on collective bubbles implosion occurring at the final of a liquid ultrasonic stretching semiperiod, and relative low consumed power on ultrasonic chain, contributing to increase the main output technological parameters mentioned above.