### CONTENTS
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Characterizations of the gamma distribution by independence property of random variables
Hyun-Woo Jin and Min-Young Lee |
157 |

Rado's and Poponov's inequalities of probability measures for positive real numbers
Hosoo Lee and Sejong Kim |
165 |

Frequently convergent solutions of a difference equation
Hui Li, Fanqiang Bu, and Yuanhong Tao |
173 |

On continued fractions, fundamental units and class numbers of real quadratic function fields
Pyung-Lyun Kang |
183 |

Galois structures of defining fields of families of elliptic curves with cyclic torsion
Daeyeol Jeon |
205 |

A note on surfaces in the normal bundle of a curve
Doohann Lee and HeungSu Yi |
211 |

An optimal consumption and investment problem with labor income and regime switching
Yong Hyun Shin |
219 |

On generalized derivations of $BE$-algebras
Kyung Ho Kim |
227 |

Pricing multi-asset derivatives with regime-switching volatilities
Kum-Hwan Roh |
237 |

On characterizations of Pareto and Weibull distributions by considering conditional expectations of upper record values
Hyun-Woo Jin and Min-Young Lee |
243 |

Relationship between the Wiener integral and the analytic Feynman integral
of cylinder function
Byoung Soo Kim |
249 |

The generalized Hyers-Ulam stability of quadratic functional equation with an involution in non-Archimedean spaces
Chang Il Kim and Chang Hyeob Shin |
261 |

A note on a regularized gap function of QVI in Banach spaces
Sangho Kum |
271 |

The pentagonal fuzzy numbers
Bongju Lee and Yong Sik Yun |
277 |

Representations of the automorphism group of a supersingular K3 surface of Artin-invariant 1
over odd characteristic
Junmyeong Jang |
287 |

Some properties of derivations on $CI$-algebras
Yong Hoon Lee and Min Surp Rhee |
297 |

Chemical hyperstructures for vanadium
Sang-Cho Chung |
309 |

Chemical hyperstructures of chemical reactions for iron and indium
Kang Moon Chun |
319 |

The Riemann delta integral on time scales
Jae Myung Park, Deok Ho Lee, Ju Han Yoon, Young Kuk Kim, and Jong Tae Lim |
327 |

Boundedness in nonlinear perturbed functional differential systems
Sang Il Choi, Dong Man Im, and Yoon Hoe Goo |
335 |

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