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 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1047—1399Download front and back covers
 On the period of $\beta$-expansion of Pisot or Salem series over $\mathbb{F}_{q}((x^{-1}))$ Ghorbel Rim and Zouari Sourour MSC numbers : 11R06, 37B50 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1047—1057
 Existence and large time behavior of solutions to a fourth-order degenerate parabolic equation Bo Liang, Meishan Wang, and Ying Wang MSC numbers : Primary 35G20, 35G30, 35G61, 35Q35 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1059—1068
 Permanence of a two species delayed competitive model with stage structure and harvesting Changjin Xu and Yusen Zu MSC numbers : Primary 34K20, 34C25, 92D25 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1069—1076
 Equivariant crossed modules and cohomology of groups with operators Pham Thi Cuc and Nguyen Tien Quang MSC numbers : 18D10, 18D30, 20E22, 20J06 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1077—1095
 Non-abelian tensor analogues of 2-auto Engel groups Mohammad Reza R. Moghaddam and Mohammad Javad Sadeghifard MSC numbers : Primary 20F28, 20F45; Secondary 20F99 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1097—1105
 The extended real line as a Julia set Monireh Akbari and Maryam Rabii MSC numbers : 37F50 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1107—1112
 Spiral wave generation in a diffusive predator-prey model with two time delays Wenzhen Gan and Peng Zhu MSC numbers : 35B35, 35B40, 92D40 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1113—1122
 Derivations on convolution algebras Mohammad Javad Mehdipour and Zahra Saeedi MSC numbers : Primary 47B47, 46H40, 16W25 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1123—1132
 On the Diophantine equation $(an)^{x}+(bn)^{y}=(cn)^{z}$ Mi-Mi Ma and Jian-Dong Wu MSC numbers : 11D61 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1133—1138
 Cyclic branched covers of alternating knots and $L$-spaces Masakazu Teragaito MSC numbers : Primary 57M25 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1139—1148
 Variational result for the bifurcation problem of the Hamiltonian system Tacksun Jung and Q-Heung Choi MSC numbers : 35Q70, 35F50 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1149—1167
 Generalized Cayley graphs of rectangular groups Yongwen Zhu MSC numbers : 05C25, 20B25, 08B15, 20M17 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1169—1183
 Optimal control of the viscous weakly dispersive Benjamin-Bona-Mahony equation Lei Zhang and Bin Liu MSC numbers : 35D40, 35Q53, 49J20, 49L25, 93C20 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1185—1199
 Some monomial sequences arising from graphs Maurizio Imbesi, Monica La Barbiera, and Zhongming Tang MSC numbers : 13A30, 13C15, 13P10 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1201—1211
 Symplectic 4-manifolds via symplectic surgery on complex surface singularities Heesang Park and Andr\'{a}s I. Stipsicz MSC numbers : 57R17, 14B05 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1213—1223
 On positiveness and contractiveness of the integral operator arising from the beam deflection problem on elastic foundation Sung Woo Choi MSC numbers : Primary 34L15, 47G10, 74K10 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1225—1240
 Dynamical bifurcation of the one dimensional modified Swift-Hohenberg equation Yuncherl Choi MSC numbers : Primary 37G35, 35B32 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1241—1252
 Kaplansky-type theorems in graded integral domains Gyu Whan Chang, Hwankoo Kim, and Dong Yeol Oh MSC numbers : 13A02, 13A15, 13F05, 13G05 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1253—1268
 Skew complex symmetric operators and Weyl type theorems Eungil Ko, Eunjeong Ko, and Ji Eun Lee MSC numbers : Primary 47A10, 47A53 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1269—1283
 The strong Mori property in rings with zero divisors Dechuan Zhou and Fanggui Wang MSC numbers : 13A15, 13F05 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1285—1295
 Samelson products in function spaces Jean-Baptiste Gatsinzi and Rugare Kwashira MSC numbers : 55P62, 55Q15 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1297—1303
 Hyperbolic notions on a planar graph of bounded face degree Byung-Geun Oh MSC numbers : Primary 05C10, 53C23; Secondary 53C45, 05B45, 52C20 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1305—1319
 The limiting case of semicontinuity of automorphism groups Steven G. Krantz MSC numbers : 32M05, 32H02 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1321—1325
 The $w$-weak global dimension of commutative rings Fanggui Wang and Lei Qiao MSC numbers : Primary 13D05, 13A15; Secondary 13F05 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1327—1338
 Non-developable ruled surfaces with timelike ruling in Minkowski 3-space Yun Yang and Yanhua Yu MSC numbers : 53A35, 53A55, 53B30 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1339—1351
 On some subgroups of $D^*$ which satisfy a generalized group identity Mai Hoang Bien MSC numbers : 16K99, 16R99, 20E28, 20D35 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1353—1363
 On the holonomization of semiholonomic jets W{\l}odzimierz M. Mikulski MSC numbers : 58A05, 58A20, 58A32 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1365—1373
 On the retracts and recodings of continuing codes Jisang Yoo MSC numbers : Primary 37B10 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1375—1382
 Product-type operators from weighted Bergman-Orlicz spaces to weighted Zygmund spaces Zhi-Jie Jiang MSC numbers : Primary 47B38; Secondary 47B33, 47B37 Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1383—1399