“…To overcome the oscillations in recovering of the particle size distribution function n(r), various techniques have been developed, e.g., direct regularization methods (Bockmann, 2001;Phillips, 1962;Shaw, 1979;Shifrin & Zolotov, 1996;Twomey, 1963;Wang, Fan, Feng, Yan, & Guan, 2006) and iterative methods (Bockmann & Kirsche, 2006;Chahine, 1970;Ferri, Bassini, & Paganini, 1995;Grassl, 1971;Lumme & Rahola, 1994;Twomey, 1975;Voutilainenand & Kaipio, 2000;Wang, Fan, & Feng, 2007;Yamamoto & Tanaka, 1969). We consider an entropy constrained regularization model in this paper, which is usually used for moment problems in different applications (Wang, 2007).…”