ocr: sim(x.c)ifchas any member document.mthe: ume window, sim(x,c) 0 otherwise (a) sin(x.c) : o 1-1) m Xstm(xc) ichasany member document in thet tme. wind otherwise (b) Figure 3.1 Delermining the moditied simiurity between a document X ond any duster cin the post (a) the basicfor- mulo, (b)t the formula with an added linear decaying-weight function. iis the number of documents between X and the most recent member document in a
(2000).iso/ieeei/971/yangf203.gif?details){kind=small}
(2000).iso/ieeei/971/yangf203.gif "Download"){kind=small}
(2000).iso/ieeei/971/1p51.gif){kind=link}