ji:s paper 1081--1088 1] 1) Pick up 1000 points at random 2) If at least one of the detecors created by the algorithm detect the point as non-self then plot it with black circle; non-self points not detected is plotted with blanc circle: all the self points are plotted with points. self radius is termed by the author but it is somehow misunderstandable. self cell, per ce, is difined as point and radius implys the area in which detector can sense the point. Why the number of detectors depend on self radius? => because algorithm terminate in three difernt ways. experiments are carried out not performed They claimed the variable-sized detector outperformed their other previous proposals (1) constant-cized detector constant-sized detector does not have a boundary-dilemma All of these tecniques can train themselves only with using self/normal patterns. if we converge a -> 0 the problem is a needle