Delay-dependent Robust Stabilization for Systems with Time-varying Delays

고정완,박부견 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.5

This paper extends the results of the stability criterion, introduced in the literature, to the problem of stabilization for systems with time-varying delays. Unfortunately, the delay-dependent stabilization conditions using state/output-feedback controllers are not formulated as LMIs. To achieve a better degree of freedom in relaxing the resultant nonlinear terms, we do not assume any restriction on the form of variables, which is a generally adopted procedure in the structure-imposing relaxation methods. Instead, we develop a congruence transformation that has the effect of gathering the dispersed nonlinear terms and bundling them together into fewer and more intensive non-convex conditions. To relax these, an efficient iterative algorithm is proposed in the form of two-phase-based convex optimization problem. Numerical examples show that the results obtained by these criteria improve the allowable maximal delays over the existing results in the literature.

유아의 정서읽기능력이 친사회적 행동에 미치는 영향: 얼굴표정을 중심으로

고정완 한국디지털정책학회 2019 디지털융복합연구 Vol.17 No.6

This study investigated the effects of young children's emotional reading ability on prosocial behavior. The participants in this study were 192 young children's. From December 17, December 27, 2018, after conducting a survey on emotional reading ability and prosocial behavior of infants, the data was analyzed using the SPSS WIN 22.0 program for pearson correlation analysis and regression analysis. The results of the analysis suggest the following: First, there were significant relationships between young children's emotional reading ability and prosocial Behavior. Second, young children’s emotional reading ability affected prosocial behavior. In conclusion, this study is believed to be the basis for the development of programs to improve emotional reading ability and promote prosocial behavior. 본 연구에서는 유아의 정서읽기능력이 친사회적 행동에 미치는 영향을 알아보고자 하였다. 연구대상은 G시에 위치하고 있는 사립유치원 만 5세 192명이다. 2018년 12월 17일부터 12월 27일까지 유아의 정서읽기능력과 친사회적 행동에 관한 조사를 실시하였다. 수집된 자료는 Pearson의 상관관계분석과 다중회귀분석을 실시하였으며, SPSS WIN 22.0 프로그램을 사용하였다. 자료 분석 결과 첫째, 유아의 정서읽기능력과 친사회적 행동은 유의미한 상관관계가 있는 것으로 나타났다. 둘째, 유아의 정서읽기능력은 친사회적 행동에 유의미한 영향을 미치는 것으로 나타났다. 결론적으로 본 연구는 정서읽기능력 향상과 친사회적 행동 증진을 위한 프로그램 개발에 대한 기초자료가 될 것으로 사료된다.

상황역할극 중심의 안전교육이 유아의 안전문제해결사고와 자기조절력에 미치는 영향

고정완,최미숙 한국유아교육학회 2015 정기학술대회 논문집 Vol.2015 No.1

본 연구는 상황역할극 중심의 안전교육이 유아의 안전문제해결사고와 자기조절력에 미치는 영향을 알아보는데 있다. 연구 대상은 G시에 위치한 사립유치원 만 5세 유아 46명으로 실험집단과 비교집단을 각각23명씩 선정하였다. 실험집단은 상황역할극 중심의 안전교육을 실시하였고, 비교집단은 이야기나누기를 활용한 안전교육을 실시하였다. 실험의 효과를 검증하기 위해 Scott(1992)의「Preventing Injury; A Safety Curriculum」내용을 중심으로 곽은복(2000)이 수정.보완한 것을 본 연구자가 연구목적에 맞게 수정.보완한 안전문제해결사고검사와 Kendall과 Wilcox(1979)가 개발한 SCRS를 유혜정(1998)이 번안하고, 이지현 (2001)이 수정한 자기조절력 검사를 실시하였다. 자료분석은 SPSS WIN 21.0 프로그램을 사용하여 ANCOVA를 실시하였다. 연구결과, 상황역할극 중심의 안전교육은 유아의 안전문제해결사고 총점과 하위 영역인 안전하게 놀이하기, 교통안전 규칙 지키기, 비상시 적절히 대처하기를 향상시켰으며, 유아의 자기조절력 총점과 하위영역인 자기통제력, 충동성 감소에 긍정적인 영향을 미치는 것으로 나타났다. 이러한 연구 결과는 상황역할극 중심의 안전교육이 유아의 안전문제해결사고 및 자기조절력을 향상시키는데 효과적임을 시사한다.

음낭수종에 대한 임상적 고찰

고정완,권성원 梨花女子大學校 醫科大學 醫科學硏究所 1981 EMJ (Ewha medical journal) Vol.4 No.4

A hydrocele is a common disease and it can be caused by etiological factors such as congenital anomaly, inflammation, trauma or parasitic infection. The great majority of hydroceles are idiopathic variety. Hydrocele of the tunica vagunalis is common in the new born and most of these fluid collection subside spontaneously during the first week of life. A hydrocele may develop secondary to local injury, tuberculous epididymitis or testicular neoplasm. Chronic hydroceles are common in tropical and subtropical areas where the incidence of filariasis is high. A clinical observation was made on 50 cases with hydrocele who had been admitted to department of urology, during the period from Apr. 1, 1976 to Mar. 31, 1981. The results were as fllows; 1. The incidence of hydrocele was 4.9% to total number of in-patient, 7.2% to total number of mail in-patient and 29.2% to total number of scrotal disease. 2. The most common population was 0-10 years of age giving a rate of 68%. 3. There were 28 cases in the right(56%), 19 cases in the left(38%) and 3 cases bilateral(6%). 4. There were 22cases of primary(44%), 15 cases congenital(30%), and 13 cases of secondry hydrocele(26%).

양측 원발성 고환종양 1례

고정완,윤종목,이호선,권성원 梨花女子大學校 醫科大學 醫科學硏究所 1980 EMJ (Ewha medical journal) Vol.3 No.1

Most of the testicular tumors are malignant and metastasis occurs relatively early. They are usually developed during the age of greatest sexual activity, between the ages of 18~35 years, and they account for about 0.5% of all malignancies in men and 4% of all tumors affecting the genitourinary tract. Bilateral primary testicular tumors account for 0.6~3.8% of all testis tumors. Up to date 40 cases of bilateral primary testicular tumors thar proved histologically to be primary tumor have been reported. Recently authors have experienced in the right testicle and seminoma developed in the left underscended testicle. A brief review of the literature and a disccusion concerning bilateral primary testicular tumors are presented in this paper.

신우에 발생한 진주종 2례

고정완,권성원 大韓泌尿器科學會 1981 Korean Journal of Urology Vol.22 No.5

미술감상을 통한 유아 언어교육 프로그램 개발 및 효과

고정완,최미숙 한국유아교육학회 2019 정기학술대회 논문집 Vol.2019 No.1

음낭질환에 대한 임상적 고찰

고정완,권성원 大韓泌尿器科學會 1982 Korean Journal of Urology Vol.23 No.3

보육교사가 인식하는 사회적지지가 직무만족도에 미치는 영향과 심리적안녕감의 매개효과

고정완 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.19

Objectives The purpose of this study was to examine the mediating effect of psychological well-being on the effect of child care teachers' social support on job satisfaction. Methods To this end, a survey was conducted on social support, psychological well-being, and job satisfaction with 246 child care teachers located in G city, and the mediating effect of regression analysis was verified using the SPSS 21.0 program and Sobel test, and statistical significance was Confirmed. Results First, social support, psychological well-being, and job satisfaction perceived by child care teachers showed significant positive correlations as a whole. The relationship between social support and job satisfaction, as well as the relationship between social support and psychological well-being, and psychological well-being and job satisfaction of child care teachers were found to be significantly positively correlated overall. Second, social support of child care teachers was found to be a variable that significantly predicted job satisfaction, and psychological well-being was shown to have a mediating effect in this process. In other words, psychological well-being has a partial mediating effect on the effect of social support on job satisfaction. Conclusions The significance of this study is that it revealed that social support recognized by child care teachers is a psychological characteristic that strongly predicts job satisfaction through psychological well-being.

XPS와 XRD 분석을 이용한 ITO 박막의 결정성과 비정질 특성에 관한 연구

고정완,정보영,오데레사 한국반도체디스플레이기술학회 2015 반도체디스플레이기술학회지 Vol.14 No.4

This study was explained the correlation between the O 1s spectra and the crystallization of ITO thin films. The crystal structure of ITO thin films changed with various annealing temperatures and annealing methods such as atmosphere or vaccum conditions. The amorphous structure observed from XRD pattern showed the O 1s spectra with 531.2 eV, and the crystal structure of annealed ITO films analyzed by XRD pattern had the O 1s spectra of 529.8 eV as lower binding energy then the 531.2 eV. Oxygen in view of ITO films was related to the crystallization, and the ITO films annealed in an atmosphere pressure showed higher crystal structure than the ITO annealed in a vacuum. It was indicated that the amorphous structure had higher binding energy than the crystal structure analyzed by O 1s spectra of ITO films.