• Human Ecology Research
• /
• 제51권3호
• /
• pp.333-340
• /
• 2013

The purpose of this study is to identify the influences of parental attitude, parenting attitudes, family function and peer attachment on the self-efficacy of middle school students in multicultural families. In particular, peer attachment was used as a mediator to determine the effects of self-efficacy. 302 multicultural family adolescents who enrolled in Seoul and Gyeonggi-do middle schools were surveyed. In order to measure the variables, this study used such scales as parenting attitude scale, family function scale, peer attachment scale and self efficacy scale. The results were analyzed by the PASW 18.0 program. The findings of the study led to the following conclusions; First, it has shown that peer attachment was the only variable that had significant differences by sex in middle school students of multicultural families. Second, the most influential variables of self-efficacy of middle school students in multicultural families was peer attachment among parenting attitude, family function and peer attachment. Third, there was a mediating effect of peer attachment among parenting attitude, family function and self-efficacy for adolescents of multicultural families. The notable distinction of this study was to find that peer attachment variable is the most important factor of self-efficacy. Considering the results in this study, aggressive intervention is necessary in order to improve the self-efficacy of middle school students in multicultural families.

• 대한수학교육학회지:학교수학
• /
• 제18권3호
• /
• pp.457-478
• /
• 2016

본 연구의 목적은 중학생들의 함수의 그래프 개념에 대한 이해와 발달을 탐색하는 것이다. 본 연구를 위해 일차함수를 학습한 경험이 없는 중학생 2명을 대상으로 약 7개월에 걸쳐 교수실험을 진행하였고, 수업을 진행하고 분석하는 과정에서 두 학생 모두 상황을 그래프로 표현하고 그래프를 상황에 적절하게 해석하는 초기 과제에서 두 변량 사이의 함수 관계보다 산술적인 값들에 주안점을 둔다는 것이 드러났다. 이에 본 연구에서는 함수의 그래프에 대한 이해와 발달, 학생간의 차이점이 드러나는 과제에 주목하여 교사가 학생들에게 제시한 과제의 의도 및 역할, 과제에 대한 학생의 반응을 기술하였다. 특히 학생의 반응은 Castillow-Garsow(2012)가 제안한 과제를 해결하는 방식, 그 방식을 이끌어내는 추론, 과제의 해결로 나누어 분석하였다. 그 결과, 함수의 그래프 표현 및 해석에서 양들의 변화와 연속성에 대한 인식의 중요성을 확인하였다.

• Journal of applied mathematics & informatics
• /
• 제41권2호
• /
• pp.247-263
• /
• 2023

In this article, we investigate the uniqueness problem of q-shift difference polynomial of meromorphic (entire) function with zero-order. Consequently, we prove three results with significantly generalize the results of Goutam Haldar.

• 대한수학교육학회지:수학교육학연구
• /
• 제27권3호
• /
• pp.375-389
• /
• 2017

본 연구에서는 연속성 개념에 대한 학교수학에서의 정의와 학문수학에서의 정의 사이의 차별성과 상호연결성을 네 가지 관점에서 분석하고 있다. 이에 따르면, '한 점에서의 연속 불연속'의 정의가 학교수학에서는 극한 과정에 의존하고 있고, 학문수학에서는 정의역의 위상에 의존하고 있다. 학교수학에서는 정의역이 하나의 구간이나 구간들의 합집합인 함수에 한하여 연속함수인가를 판정할 수 있으나, 학문수학에서는 어떠한 함수에 대해서도 연속함수인가를 판정할 수 있다. 본 연구에서는 이러한 결과에 근거하여, 학교수학에서의 연속성 개념 취급과 관련하여 다음 두 가지 의견을 제시한다. 첫째, 극한 과정을 기반으로 한 학교수학에서의 국소적 연속성 개념으로 볼 때, 2009 개정 교과서에서 함수의 정의역에 속하지 않는 특정한 점에서 불연속을 취급하는 것은 적절하다. 이때 불연속점으로 무한 불연속점, 제거 가능한 불연속점과 도약 불연속점의 유형이 나타난다. 둘째, 일반적인 연속함수의 정의로 "함수 y = f(x)에서 정의역에 불연속점이 없으면, f을 연속함수라 한다."를 제안한다. 이 정의는 정의역에 속하지 않은 점에서의 불연속성의 판정을 허용하면서, 학문수학에서의 정의와 일관되게 연결된다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2003년도 ICCAS
• /
• pp.921-926
• /
• 2003

This paper describes a new type of the spatial filter detector (SFD) with variable and multi-valued weighting function. This SFD called variable spatial filter detector with multi-valued weighting function (VSFDwMWF) uses current-mode circuits for noise resistance and high-resolution weighting values. Total weighting values consist of 7bit, 6-signal bit and 1-sign bit. We fabricate VSFDwMWF chip using Rohm 0.35${\mu}$m CMOS process. VSFDwMWF chip includes two-dimensional 10${\times}$13 photodiode array and current-mode weighting control circuit. Simulation shows the weighting values are varied and multi-valued by external switching operation. The layout of VSFDwMWF chip is shown.

• Journal of Magnetics
• /
• 제19권4호
• /
• pp.378-384
• /
• 2014

Optimization design and robust design are significant measures for improving the performance and reliability of electromagnetic devices (EMDs, specifically refer to relays, contactors in this paper). However, the implementation of the above-mentioned design requires substantial calculation; consequently, on the premise of guaranteeing precision, how to improve the calculation speed is a problem that needs to be solved. This paper proposes a new method for establishing an approximate model for the EMD. It builds a relationship between the input and output of the EMD with different coil voltages and air gaps, by using a user-defined interpolating function. The coefficient of the fitting function is determined based on a quantum particle swarm optimization (QPSO) method. The effectiveness of the method proposed in this paper is verified by the electromagnetic force calculation results of an electromagnetic relay with permanent magnet.

• Journal of Power Electronics
• /
• 제17권4호
• /
• pp.983-990
• /
• 2017

This paper proposes a model predictive control based on the discrete Lyapunov function to improve the performance of power electronic converters. The proposed control technique, based on the finite control set model predictive control (FCS-MPC), defines a cost function for the control law which is determined under the Lyapunov stability theorem with a control error compensation. The steady state and dynamic performance of the proposed control strategy has been tested under a single phase AC/DC voltage source rectifier (S-VSR). Experimental results demonstrate that the proposed control strategy not only offers global stability and good robustness but also leads to a high quality sinusoidal current with a reasonably low total harmonic distortion (THD) and a fast dynamic response under linear loads.

• 한국컴퓨터정보학회논문지
• /
• 제23권8호
• /
• pp.67-73
• /
• 2018

In this paper, we propose an electronic attendance management system using the bluetooth function of the beacon and BLE advertising function of the smart phone. In the beacon-only bluetooth attendance confirmation system, it is needed more than one beacons according to the class room sizes. A BLE advertising function based attendance confirmation system can not provide the information about the location of the attendances. In the proposed system, we can identify the location of the instructor using the beacon of the class room, and confirm the attendances by checking the position of the attendances's smart phone. In this system, we can achieves the goals of electronic attendance management system using only one beacon per a class room.

• Rapid Communication in Photoscience
• /
• 제3권4호
• /
• pp.79-80
• /
• 2014

We characterized the one-electron reduction of oligodeoxynucleotides with a 2-oxopropyl group on a thymine base ($d^{oxo}T$) and applied the reaction to the radiolytic activation of DNAzyme function. We designed a system in which the DNAzyme function of cleaving mRNA was suppressed by introduction of $d^{oxo}T$ into the strand of DNAzyme. Hypoxic X-irradiation led to recovery of the cleavage ability because the 2-oxopropyl group was removed to form unmodified DNAzyme. We characterized the DNAzyme function by monitoring the fluorescence change of fluorophore- and quencher-labeled target strands. We confirmed that the DNAzyme function could be regulated by hypoxic X-irradiation and the reaction of $d^{oxo}T$.

• 대한수학회논문집
• /
• 제32권3호
• /
• pp.637-651
• /
• 2017

Very recently, Mubeen, et al. [6] have obtained fifteen contiguous function relations for k-hypergeometric functions with one parameter by the same technique developed by Gauss. The aim of this paper is to obtain seventy-two new and interesting contiguous function relations for k-hypergeometric functions with two parameters. Obviously, for $k{\rightarrow}1$ we recover the results obtained by Cho, et al. [2] and Rakha, et al. [8].