A photosensitive monomer including a methylene butyrolactone derivative represented by the following formula: 1wherein R1 is a hydrogen atom or alkyl group, R2 is an acid-labile group, X is a hydrogen atom, or substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and Y is a substituted or unsubstitued alkyl group or alicyclic hydrocarbon group having 1 to 20 carbon atoms. Positions in the scrollable advertisement unit are ranked based on a measure of predicted performance of an advertisement in each position. The network addresses of the resources are cached so as to generate cached network addresses, and if the user requests the content, the cached network addresses are utilized to access the resources associated with the content. The pattern may describe an occurrence of particular values at particular timestamps of the time series. Therefore, the LED floor lamp can provide a high illumination while avoiding energy waste. The extrusions with the cross sections of the same shape can be made into frames of any size.