Polytechnic University of Milan

About: Polytechnic University of Milan is a education organization based out in Milan, Italy. It is known for research contribution in the topics: Computer science & Finite element method. The organization has 18231 authors who have published 58416 publications receiving 1229711 citations. The organization is also known as: PoliMi & L-NESS.

Recovery and Drift Dynamics of Resistance and Threshold Voltages in Phase-Change Memories

Abstract: The electronic behavior of the chalcogenide material used in phase-change memory (PCM) plays a key role in defining the operation voltages and times of the memory cell. In particular, the threshold voltage for electronic switching of the amorphous chalcogenide determines the boundary between programming and readout operation, while its resistance allows the recognition of the bit status. This paper present a time-resolved analysis of threshold voltage and resistance in a PCM. Both dynamics of threshold voltage and resistance display a fast transient, named recovery behavior, in the first 30 ns after programming. A slower, nonsaturating drift transient is found for longer times. The two transients are discussed referring to electronic and structural rearrangements in the amorphous chalcogenide. Finally, the impact on the device level is considered

The Linkage Between Supply Chain Integration And Manufacturing Improvement Programmes

Abstract: Purpose – While the attention of most OM scholars has shifted to supply chain management, there is still a need to understand how supply chain strategies are linked with internal manufacturing strategies. The literature shows some studies in this field, but a deep investigation of the linkages between these two areas is still missing. The purpose of this study is to investigate on an empirical basis the relationship between two supply chain integration dimensions – the integration of information flows and the integration of physical flows – and two manufacturing improvement programmes – lean production and enterprise resource planning (ERP) systems.Design/methodology/approach – Evidence is drawn from a sample of 297 European companies from the third edition of the International Manufacturing Strategy Survey. Data are analysed using exploratory factor analysis and hierarchical regression.Findings – Results show that the adoption of the lean production model has a strong influence on the integration of both...

Electronic switching effect and phase-change transition in chalcogenide materials

Abstract: The threshold switching mechanism in amorphous chalcogenides is investigated, showing experimental data that once and for all demonstrate its electronic nature. The physical mechanisms responsible for the switching to the highly conductive state are discussed and the impact of cumulative read-out pulses is also investigated, showing that phase-change transitions induced by usual reading operations in phase-change memory cells are completely negligible.