In an electrophotographic photosensitive member having a surface layer containing a polymer obtainable by polymerization of a compound having a chain-polymerizable functional group, the compound having a chain-polymerizable functional group includes a compound represented by formula. However, when there are two sampling points identical in power P but different in variance V in a region low in power P, the luminance of a pixel corresponding to the sampling point relatively large in variance is set higher than that of a pixel corresponding to the sampling point relatively small in variance V. In one embodiment of the invention, the switching may occur adaptively. Finally, the method performs a R-P link setup using the prepared list of PDSN in accordance with a determined result. The agent selects one of the contacts in the contact queue. This design greatly reduces stresses on the system and increases energy output relative to a Darrieus turbine fully immersed in water flow.