• Journal of the Korean Institute of Telematics and Electronics
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• v.16 no.3
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• pp.19-27
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• 1979

Microprocessor based digital filter was designed rising focus number system in order to increase the multiplication speed of microprocessor program. Addition and subtraction program was treated using look up table. The sampling speed was improved up to 500 samples per seconds on the third-order low- Pass digital filters.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.363-366
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• 1998

High frequency scattered fields by a double impedence wedge are computed. In the procedure of the computation, arbitrary impedence faces and wedge angles are considered. The diffraction coefficients for the single, double and triple diffraction mechanism are founded. The second-order and third-order diffracted fields are approximated via the extended spectral ray method and the modified Pauli-Clemmow method of the steepest descent. The maliuzhinets function which is very difficult to obtain accurate value is approximated by the Volakis's asymtotic expression. Numerical computations are performed for the various wedge angles and surface impedence values.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.115-118
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• 2003

This study was carried out to analyse the central functions of district-load areas (Eup or Myon in Korea) in the neighbourhood zone of Saemankeum Reclamation Area. From the calculation results of their functional indices, only 4 areas were selected as the second-order centers, while remaining 12 areas as the third-order centers. (key villages)

• Journal of applied mathematics & informatics
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• v.5 no.3
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• pp.759-770
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• 1998

In this paper we use uniform cubic spline polynomials to derive some new consistency relations. These relations are then used to develop a numerical method for computing smooth approxi-mations to the solution and its first second as well as third derivatives for a second order boundary value problem. The proesent method out-performs other collocations finite-difference and splines methods of the same order. numerical illustratiosn are provided to demonstrate the practical use of our method.

• Honam Mathematical Journal
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• v.40 no.3
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• pp.391-400
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• 2018

The object of this paper to construct a new class $$A^m_{{\mu},{\lambda},{\delta}}({\alpha},{\beta},{\gamma},t,{\Psi})$$ of bi-univalent functions of complex order defined in the open unit disc. The second and the third coefficients of the Taylor-Maclaurin series for functions in the new subclass are determined. Several special consequences of the results are also indicated.

• The Pure and Applied Mathematics
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• v.3 no.1
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• pp.47-52
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• 1996

We consider the third order linear homogeneous differential equation L$_3$(y) = y(equation omitted) ＋ P($\chi$)y' ＋ Q($\chi$)y = 0 (E) P($\chi$) $\geq$ 0, Q($\chi$) ＞ 0 and P($\chi$)/Q($\chi$) is nondecreasing on [${\alpha}$, $\infty$) for some real number ${\alpha}$. (1) In this paper we discuss the distribution of zeros of solutions and a condition of oscillatory for equation (E).(omitted)

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.10a
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• pp.275-281
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• 1996

In order to examine the validity of an asymptotic solution obtained from the method of multiple scales, we investigate a third-order subharmonic resonance response of a bar constrained by a nonlinear spring to a harmonic excitation. The motion of the bar is governed by a linear partial differential equation with a nonlinear boundary condition. The nonlinear boundary value problem is solved by using the finite difference method. The numerical solution is compared with the asymptotic solution.

• Communications of the Korean Mathematical Society
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• v.37 no.4
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• pp.977-988
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• 2022

The Padovan sequence is the third-order linear recurrence (𝓟_n)_n≥0 defined by 𝓟_n = 𝓟_n-2 + 𝓟_n-3 for all n ≥ 3 with initial conditions 𝓟₀ = 0 and 𝓟₁ = 𝓟₂ = 1. In this paper, we investigate a generalization of the Padovan sequence called the k-generalized Padovan sequence which is generated by a linear recurrence sequence of order k ≥ 3. We present recurrence relations, the generalized Binet formula and different arithmetic properties for the above family of sequences.

• Honam Mathematical Journal
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• v.45 no.1
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• pp.92-108
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• 2023

We determine the upper bounds on fourth order Hankel determinants H⁽²⁾₄(f) and H⁽³⁾₄(f) for the class S^*_L of lemniscate starlike functions defined on the open unit disk which was introduced by Sokół and Stankiewicz in [17].

• Journal of The Korea Institute of Healthcare Architecture
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• v.27 no.1
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• pp.45-51
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• 2021

Purpose: Problems related to the elderly's daily life, such as social isolation and absence of a place to go, are already widely recognized, but there are few domestic studies or support policies for this, and the elderly leisure welfare facilities provided by the state do not fully support the elderly's daily life. There are studies related to the elderly's neighborhood environment and facilities, which can be seen as the third place for the elderly in Korea, but these are mostly quantitative studies. In order to talk about the third place for daily support for the elderly in Korea, a detailed study of the use cases of the third place in Korea is needed. This study analyzes the third place of the elderly in Korea and discovers the characteristics and components. Based on the detailed analysis of the third place of the elderly, the characteristics of the third place of the elderly in Korea and the elements constituting it are found to be able to represent the specific necessary environment of the third place of the elderly. Methods: The research targets include 'A Mill' (located in Jungnang-gu, Seoul), and 'Roadside in front of Villa B'(located in Dongdaemun-gu, Seoul), 'C-dong roadside park'(located in Dobong-gu, Seoul) within the range of repeated observations and meetings among the places used as a third place for the elderly was selected. The site survey consisted of in-depth interviews, observational surveys, and participatory observations. In-depth interviews were held for a total of 5 months, from October to December 2019 and from April to May 2020. Results: As a result, a total of 11 characteristics (adjacent to the residence, an open place, an independent space, a comfortable place to stay, a pleasant space, safety is guaranteed, a place that has been operated for a long time, a place that can be used autonomously, a place where social exchange occurs, No financial burden, fun activities) was discovered. Implications: This study is significant in that unlike the existing studies focusing on the use behavior of established institutions or facilities, the elderly identified the necessary environment through their own created places.