We present a systematic algorithm capable of searching for optimal colors for any lightness L * (between 0 and 100), any illuminant (D65, F2, F7, F11, etc.), and any light source reported by CIE. Color solids are graphed in some color spaces (CIELAB, SVF, DIN99d, and CIECAM02) by horizontal (constant lightness) and transversal (constant hue angle) sections. Color solids plotted in DIN99d and CIECAM02 color spaces look more spherical or homogeneous than the ones plotted in CIELAB and SVF color spaces. Depending on the spectrum of the light source or illuminant, the shape of its color solid and its content (variety of distinguishable colors, with or without color correspondence) change drastically, particularly with sources whose spectrum is discontinuous and/or very peaked, with correlated color temperature lower than 5500 K. This could be used to propose an absolute colorimetric quality index for light sources comparing the volumes of their gamuts, in a uniform color space.
E-Maintenance has raised increased interest in recent years. During the last years we have seen the development of e-Maintenance techniques. The key elements are the extensive use of Internet that has exploded and rapid development of sensors and processing power. It can be claimed that the use of e-Maintenance at the moment still is at infant stage. This paper offers a generic view of e-Maintenance and points out both the benefits as well as the hurdles there still exist on the road to support the complete life cycle of a product with e-Maintenance, while providing a critical assessment of the current state of things. Based on this discussion, the paper seeks to assess how e-Maintenance will develop within the next five to ten years. Special emphasis is given on how the end users can benefit from e-Maintenance i.e. how radical the change really is and what are the financial implications related to its adoption.
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