Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface. Reflectances of room surfaces are used in determining coefficient of utilization values for luminaires.
The last three lines show you how to define your own awk function. The format is simple -- type function, then the function name, and then the parameters separated by commas, inside parentheses. After this, a { } code block contains the code that you'd like this function to execute.
PPK vs CPK. PPK and CPK are mainly process capability indices. When PPK stands for Process Performance Index, CPK stands for Process Capability Index. Both PPK and CPK have very wide impacts on the performance strategy of organisations and they are very closely watched. CPK or Process Capability Index is an index that measures how a process is running to its specification limits in relation to the natural variability of the process.