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 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1007—1315Download front and back covers
 On generalized Krull power series rings Le Thi Ngoc Giau, Phan Thanh Toan MSC numbers : 13F05, 13F25 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1007—1012
 $\eta$-parallel H-contact 3-manifolds Jong Taek Cho MSC numbers : Primary 53C25; Secondary 53B20, 53D10 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1013—1022
 A note on the units of Mantaci-Reutenauer algebra Hasan Arslan, Himmet Can MSC numbers : Primary 20F55 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1037—1049
 Real polyhedral products, Moore's conjecture, and simplicial actions on real toric spaces Jin Hong Kim MSC numbers : 55Q05, 13F55, 55U10, 55U10, 14M25, 20C30 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1051—1063
 Approximate controllability of second-order nonlocal impulsive functional integro-differential systems in Banach spaces Dumitru Baleanu, Mani Mallika Arjunan, Mahalingam Nagaraj, Selvaraj Suganya MSC numbers : 93B05, 34A37, 34B10, 35R10 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1065—1092
 Pullbacks of $\mathcal{C}$-hereditary domains Yongyan Pu, Gaohua Tang, Fanggui Wang MSC numbers : 13C99, 13A15 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1093—1101
 A characterization of hyperbolic spaces Dong-Soo Kim, Young Ho Kim, Jae Won Lee MSC numbers : 53B25, 53B30 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1103—1107
 Approximate and Character amenability of Vector-valued Lipschitz algebras Emamgholi Biyabani, Ali Rejali MSC numbers : Primary 46B28, 46M05, 46J10 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1109—1124
 Thickly syndetic sensitivity of semigroup actions Huoyun Wang MSC numbers : Primary 37B20, 37B05, 54H20 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1125—1135
 Disjoint supercyclic weighted composition operators Yu-Xia Liang, Ze-Hua Zhou MSC numbers : Primary 47A16, 47B33, 47B38 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1137—1147
 A generalization of Gauss' triangular theorem Jangwon Ju, Byeong-Kweon Oh MSC numbers : Primary 11E12, 11E20 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1149—1159
 Global solutions for a class of nonlinear sixth-order wave equation Ying Wang MSC numbers : 35L60, 35K55, 35Q80 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1161—1178
 On a class of constacyclic codes of length $2p^s$ over $\frac{\mathbb F_{p^m}[u]}{\left\langle u^a \right\rangle}$ Hai Q. Dinh, Bac Trong Nguyen, Songsak Sriboonchitta MSC numbers : Primary 94B15, 94B05; Secondary 11T71 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1189—1208
 On the norm of the operator $aI+bH$ on $L^p(\mathbb R)$ Yong Ding, Loukas Grafakos, Kai Zhu MSC numbers : Primary 42A45; Secondary 42A50, 42A99 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1209—1219
 Note on the decomposition of states Donghoon Hyeon, Jaekwang Kim MSC numbers : 14L24 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1221—1230
 Generating sample paths and their convergence of the geometric fractional Brownian motion Hi Jun Choe, Jeong Ho Chu, Jongeun Kim MSC numbers : Primary 60G22 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1241—1261
 Weighted gDMP inverse of operators between Hilbert spaces Dijana Mosic MSC numbers : 47A05, 47A99, 15A09 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1263—1271
 The properties of Riemannian foliations admitting transversal conformal fields Seoung Dal Jung, Keum Ran Lee MSC numbers : 53C20, 57R30 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1273—1283
 Determinantal expression of the general solution to a restricted system of quaternion matrix equations with applications Guang-Jing Song MSC numbers : 15A09, 15A24 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1285—1301
 A stochastic variance reduction method for PCA by an exact penalty approach Yoon Mo Jung, Jae Hwa Lee, Sangwoon Yun MSC numbers : 62H25, 90C30, 15A18 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1303—1315
 Morphisms of varieties over ample fields Lior Bary-Soroker, Wulf-Dieter Geyer, Moshe Jarden MSC numbers : 12E30 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1023—1035
 Weakly tripotent rings Simion Breaz, Andrada Cimpean MSC numbers : 16R50, 16U60, 16U99 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1179—1187
 On conformal transformations between two almost regular $(\alpha,\beta)$-metrics Guangzu Chen, Lihong Liu MSC numbers : 53B40, 53C60 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1231—1240