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 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, : 1007—1315
 On generalized Krull power series rings Le Thi Ngoc Giau, Phan Thanh Toan Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1007—1012
 $\eta$-parallel H-contact 3-manifolds Jong Taek Cho Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1013—1022
 Morphisms of varieties over ample fields Lior Bary-Soroker, Wulf-Dieter Geyer, Moshe Jarden Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1023—1035
 A note on the units of Mantaci-Reutenauer algebra Hasan Arslan, Himmet Can 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 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 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1065—1092
 Pullbacks of $\mathcal{C}$-hereditary domains Yongyan Pu, Gaohua Tang, Fanggui Wang 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 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1103—1107
 Approximate and Character amenability of Vector-valued Lipschitz algebras Emamgholi Biyabani, Ali Rejali Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1109—1124
 Thickly syndetic sensitivity of semigroup actions Huoyun Wang Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1125—1135
 Disjoint supercyclic weighted composition operators Yu-Xia Liang, Ze-Hua Zhou Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1137—1147
 A generalization of Gauss' triangular theorem Jangwon Ju, Byeong-Kweon Oh Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1149—1159
 Global solutions for a class of nonlinear sixth-order wave equation Ying Wang Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1161—1178
 Weakly tripotent rings Simion Breaz, Andrada Cimpean Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1179—1187
 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 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 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1209—1219
 Note on the decomposition of states Donghoon Hyeon, Jaekwang Kim Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1221—1230
 On conformal transformations between two almost regular $(\alpha,\beta)$-metrics Guangzu Chen, Lihong Liu Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1231—1240
 Generating sample paths and their convergence of the geometric fractional Brownian motion Hi Jun Choe, Jeong Ho Chu, Jongeun Kim Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1241—1261
 Weighted gDMP inverse of operators between Hilbert spaces Dijana Mosic 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 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 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 Bull. Korean Math. Soc. 2018 Vol. 55, No. 4, 1303—1315