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Design for Robustness and Cost Effectiveness: The Case of an Optical Profilometer
Baldi, Antonio,Pedone, Paola,Romano, Daniele The Korean Society for Quality Management 2006 The Asian Journal on Quality Vol.7 No.1
The paper presents the design of an optical profilometer, a device used for the reconstruction of the micro-geometry of mechanical parts in applications where high precision is needed. The design is based on Robust Design, a major' methodology for quality improvement of engineering systems. Several design solutions, namely different hardware and software setups of the device, are compared in order to select a configuration realising a desired trade-off between performance and cost. The peculiarity of the design strategy is the use of a computer model of the measurement process where the physical part of the process is simulated. This allows for an extensive exploration of the design space, thus opening the way to product innovation.
Kim, Pansoo,Vanelli-Coralli, Alessandro,Villanti, Marco,Pedone, Raffaella,Cioni, Stefano,Neri, Massimo,Palestini, Claudio,Papaleo, Marco,Lee, Ho-Jin,Corazza, Giovanni E. John Wiley Sons, Ltd. 2010 International journal of satellite communications Vol.28 No.3
<P>The recently approved mobile version of the Digital Video Broadcasting Return Channel via Satellite (DVB-RCS+M) foresees the use of direct sequence spectrum spreading (DS-SS) in the forward link. The addition of a spreading mode, on top of the conventional time division signaling structure of the fixed DVB-S2, allows in fact for the efficient extension of DVB-S2 to mobile terminals with small aperture antennas operating in Ku (11–14 GHz) and Ka (20–30 GHz) bands. Spectrum spreading has been introduced to augment the received energy without increasing the transmitted power density, which is limited by regulatory constraints, and to enhance the waveform resilience to co-channel interference. In this paper, we report on the design and assessment of the DS-SS technique that we carried out for its inclusion in the DVB-RCS+M standard. In particular, by comparing the physical layer performance of the spread and nonspread modes in the specific DVB-RCS+M mobile scenarios, we show that the proposed DS-SS technique has no impact on the DVB-RCS+M data detection performance, while satisfying the requirements on interference resilience and received energy augmentation. In order to deal with the acquisition issues raised by the introduction of the DS-SS technique, we then propose and evaluate several synchronization sub-systems able to deal with the specific impairments of the mobile satellite scenarios, that is, large frequency offsets, phase noise, link obstructions, etc. Finally, a possible implementation of the DS-SS technique that fully accommodates the reuse of the specific hardware compatible with conventional DVB-S2 is also reported. Copyright © 2009 John Wiley & Sons, Ltd.</P>