• Korean Journal of Mathematics
• /
• v.32 no.3
• /
• pp.545-560
• /
• 2024

In the present study, we have constructed a new Banach series space |𝛶^r|^u_p by using concept of absolute Jordan totient summability |𝛶^r, u_n|_p which is derived by the infinite regular matrix of the Jordan's totient function. Also, we prove that the series space |𝛶^r|^u_p is linearly isomorphic to the space of all p-absolutely summable sequences ℓ_p for p ≥ 1. Moreover, we compute the α-, β- and γ- duals of this space and construct Schauder basis for the series space |𝛶^r|^u_p. Finally, we characterize the classes of infinite matrices (|𝛶^r|^u_p, X) and (X, |𝛶^r|^u_p), where X is any given classical sequence spaces ℓ_∞, c, c₀ and ℓ₁.

• Journal of Convergence for Information Technology
• /
• v.8 no.6
• /
• pp.381-387
• /
• 2018

The purpose of this study is to make a lot of efforts for student employment in government or university. therefore We have developed Start-up Consulting courses that include easy to find jobs, convergence and multidisciplinary knowledge. The results of the comparison between university and graduate school, management consulting, and start-up consulting curriculum were reviewed according to STEAM 's rules. The results were divided into 5 main classes and 15 sub classes according to the 15 week subject. As a result of the study, we divided into 5 main classes and 15 sub classes in accordance with the 15 week subject. We were able to apply the understanding to the 1st stage company understanding(Arts), 2 stage consulting ability(Technology) 3 stage entrepreneurship strategy(Technology) 4 stage sub consulting(STEAM) 5 stage management case analysis(Arts).

• Journal of applied mathematics & informatics
• /
• v.40 no.1_2
• /
• pp.341-350
• /
• 2022

We introduce certain subclasses of bi-univalent functions related to the strongly Janowski functions and discuss the Taylor-Maclaurin coefficients |a₂| and |a₃| for the newly defined classes. Also, we deduce certain new results and known results as special cases of our investigation.

• Korean Journal of Mathematics
• /
• v.32 no.1
• /
• pp.183-193
• /
• 2024

In this paper, a new class of bi-univalent functions that are described by Gegenbauer polynomials is presented. We obtain the estimates of the Taylor-Maclaurin coefficients |m₂| and |m₃| for each function in this class of bi-univalent functions. In addition, the Fekete-Szegö problems function new are also studied.

• Kyungpook Mathematical Journal
• /
• v.30 no.1
• /
• pp.59-63
• /
• 1990

• Communications of the Korean Mathematical Society
• /
• v.36 no.4
• /
• pp.715-727
• /
• 2021

In this paper, we give some results an upper bound of Hankel determinant of H₂(1) for the classes of 𝓝 (𝜶). We get a sharp upper bound for H₂(1) = c₃ - c²₂ for 𝓝 (𝜶) by adding z₁, z₂, …, z_n zeros of f(z) which are different than zero. Moreover, in a class of analytic functions on the unit disc, assuming the existence of angular limit on the boundary point, the estimations below of the modulus of angular derivative have been obtained. Finally, the sharpness of the inequalities obtained in the presented theorems are proved.

• Journal of Digital Convergence
• /
• v.18 no.9
• /
• pp.423-431
• /
• 2020

The purpose of this study is to examine how the level of participation in dance classes affects the development of social skills and peer relationship. The results are as follows: First, in terms of social skill development and peer relationship based on demographic characteristics, competition-a sub-factor of peer relationship-was higher in male students. In terms of grade level, confidence-a sub-factor of peer relationship-was high in second year students. Second, in terms of the effect of dance class participation on social skill development, autonomy, achievement, and cooperation-sub-factors of social skill-were significantly influenced by the period of participation in dance classes. Participation frequency, on the other hand, was found to significantly impact accountability and activity. Such results indicate that longer dance class participation periods more significantly influences social skill development. Third, in terms of the influence of dance class participation in peer relationship, students who participated in dance classes longer experienced positive impacts regarding sub-factors of peer relationship. Longer participation periods were correlated with lower hostilities. That is, longer participation period and time, as well as, higher participation frequency, have impact on peer relationship.

• Journal of Fisheries and Marine Sciences Education
• /
• v.28 no.4
• /
• pp.1133-1142
• /
• 2016

The purpose of this study was to verify the effects of science classes using abductive strategies on the scientific concept understanding and meta-cognition. The subjects included two classes of sixth graders from K Elementary School in B Metropolitan City and they divided into two groups. Research group was composed of 21 students(10 boys, 11 girls) and comparative group was composed of 21 students(11 boys, 10 girls). In order to achieve aims of this study, proper contents to apply abductive strategies were selected from the first semester science curriculum for sixth graders. Also five-steps study papers were designed to elicit abductive reasoning. While the research group received 20 times of reframed science lessons using abductive strategies, the comparative group received common science lessons according to the teachers' manual. The results of this study are as follows. First, science classes using abductive strategies were effective for the scientific concept understanding. Also there were statistically significant differences between the research group and the comparative group in overall science sub-domain. In the process of hypothesis formulating, students tried to find out scientific causes thoroughly to present the optimal explanation and they concentrated on the analysis of each scientific concept. It is thought that this process contributed to better understanding in scientific concepts. Second, science classes using abductive strategies were effective for improving meta-cognition. There were statistically significant differences between the two groups and especially in monitoring that is one of sub-factors of meta-cognition. It indicates that hypothesis formulating process gave positive effect on meta-cognition by stimulating critical thinking and manifesting elaboration.

• Communications of the Korean Mathematical Society
• /
• v.37 no.2
• /
• pp.455-472
• /
• 2022

For j = 0, 1, 2,…, k - 1; k ≥ 2; and - 1 ≤ B < A ≤ 1, we have introduced the functions classes denoted by ST_[j,k](A, B) and K_[j,k](A, B), respectively, called the generalized (j, k)-symmetric starlike and convex functions. We first proved the sharp bounds on |f(z)| and |f'(z)|. Various radii related problems, such as radius of (j, k)-symmetric starlikeness, convexity, strongly starlikeness and parabolic starlikeness are determined. The quantity |a²₃ - a₅|, which provide the initial bound on Zalcman functional is obtained for the functions in the family ST_[j,k]. Furthermore, the sharp pre-Schwarzian norm is also established for the case when f is a member of K_[j,k](α) for all 0 ≤ α < 1.

• Journal of Magnetics
• /
• v.10 no.3
• /
• pp.122-127
• /
• 2005

New classes of LC resonators for micro magnetic sensor device were proposed and fabricated. The first type LC resonator (Type I) consists of a small piece of microwire and two cylindrical electrodes at the end of the microwire without direct contact to its ferromagnetic core. In type I resonator the ferromagnetic core of the microwire and cylindrical electrodes act as an inductor and two capacitors respectively to form a LC circuit. The second type LC resonator (Type II) consists of a solenoidal micro-inductor with a bundle of soft magnetic microwires as a core. The solenoidal micro-inductors fabricated by MEMS technique were $500\sim1,000\;\mu{m}$ in length with $10\sim20$ turns. A capacitor is connected in parallel to the micro-inductor to form a LC circuit. A tiny glass coated $CO_{83.2}B_{3.3}Si_{5.9}Mn_{7.6}$ microwire was fabricated by a glass-coated melt spinning technique. A supergiant magneto-impedance effect was found in a type I resonator as much as 400,000% by precise tuning frequency at around 518.51 MHz. In type II resonator the changes of inductance as a function of external magnetic field in micro-inductors with properly annealed microwire cores were varied as much as 370%. The phase angle between current and voltage was also strongly dependent on the magnetic field. The drastic increments of magnetoimpedance at near the resonance frequency were observed in both types of LC resonators. Accordingly, the sudden change of the phase angle, as large as $180^{\circ}C$, evidenced the occurrence of the resonance at a given external magnetic field.