## CONTENTS | |
---|---|

A note on the characterizations of the Gumbel distribution based on lower record values
Hyun-Woo Jin and Min-Young Lee |
285 |

Boundedness in functional perturbed differential systems via $t_{\infty}$-similarity
Dong Man Im, Sang Il Choi, and Yoon Hoe Goo |
291 |

Characteristic matrices of some hybrid cellular automata with rules 60 and 102
Jae-Gyeom Kim |
305 |

On $*$-semiderivations and commutativity of prime $*$-rings
Kyung Ho Kim |
313 |

Note on spectrum of linear differential operators with periodic coefficients
Soyeun Jung |
323 |

Calabi--Yau threefolds from building blocks of $G_2$-manifolds
Nam-Hoon Lee |
331 |

On Characterizations of the power distribution via the identical hazard rate of lower record values
Min-Young Lee |
337 |

A study on the set-valued discrete dynamical system $(2^X$, $\overline f )$
Kyung Bok Lee |
341 |