大學生 隱語考

徐炳國,柳基龍 慶北大學校 師範大學 1979 敎育硏究誌 Vol.21 No.-

The aim of this thesis is. to study 2700 pieces of the secret language collected from collegians. The collegian secret language is characteristic of secrecy, taboo, novelty, the desire to break stereotype, humorousness, ostentation, and simplicity. It consists of neologism, popular tongue, vulgarism, slang, and abbreviation. It is also fresh and refined, and much of it has resulted from the knowledge and culture of high level. Besides, the secret language concerning smoking, drinking, speculative games, hetrosexual group meeting, date, festival, part-time job, and examination is productive.

성별 및 수준별 10학년 학생들의 과학 성취도 분석

이병국,강용희,유계화 慶北大學校 科學敎育硏究所 2004 科學敎育硏究誌 Vol.28 No.-

The purpose of this study is to examine the differences of science achievement by gender and by level of academic achievement. The subjects are consisted of 211 male and 212 female 10th graders in Daegu Metropolitan City and are also divided into three groups: low-, average-, and high-academic achievement level. All kinds of examinations which the subjects had taken during 2003 academic year were analyzed (e.g., the regular, trial, entrance diagnostic evaluation and formative examinations). The results indicate that statistically significant differences exist on the scores between male and female students. In general, the scores of female students (both low- and average-academic achievement level) are higher than male students. However, the scores for male students who had high level of academic achievement are higher than those of female students who had high level of academic achievement. Specifically, the scores of the regular examinations for female students are higher than those of male student. However, female students have no higher scores in the trial examinations than male students compared to the other examinations. This corresponds to Kimball(1989)'s hypothesis that female students are poor at the external examinations. In addition, the variation of scores is very steep in the entrance diagnostic evaluation and formative tests compared to regular and trial examinations. It seems that the achievement on tests does not determined by gender, however, the students' state of seriousness related to the tests. Additional analysis reveals that male students have made weaker achievement on scores of biology in the regular and trial examinations. Female students who had high-academic achievement level have made higher scores on the regular examination. In general, it seems that males had been more affirmative than females in the attitude related scientific subjects. However, there is no significant correlation between scientific attitude and science achievement. Based on the results of this study, there are no gender differences in the attitude for learning science. It appears that students who had high-academic achievement level are tended to have more positive attitude toward studying science.

사후적 이윤율 규제에 대한 이론적 평가

김재철,유병국 한국경영과학회 1989 韓國經營科學會誌 Vol.14 No.2

The present paper analyzes performance of a variable of rate-of-return regulation called the ex-post adjustment regulation put in effect in the Korean petroleum refinery sector. Unlike the traditional rate-of-return regulation on a monopoly, the regulation is first for the oligopolistic industry as a whole and second of the ex post nature. Under the regulation, at the end of each year, each firm is responsible to pay allowed profits. It is shown that if the excess profits are completely collected (including the interests), the social optimum can realized. When only a portion of the excess profits can be collected, the regulation generally increases consumer surplus by making the firms more competitive. Each individual firm's production under the regulation depends on whether the firm's output is regarded as a strategic substitute or complement of other firm's output.

퍼지 補償器를 利用한 로봇의 適應制御

金炅鎬,兪炳國 木浦大學校 情報産業硏究所 1998 情報産業硏究誌 Vol.6 No.-

In this note, an adaptive controller for the robot menipulator which has the parametric uncertainties in its dynamic model is designed. In order to compensate this uncertainties, we use the fuzzy logic that has the capability to approximate any nonlinear function with the compact input space. The stability of the proposed control scheme is proved and the adaptive law are derived by using Lyapunov stability theory. The validity of this controller is shown through the computer simulations of two-link rigid robot manipulator.

한국에서의 간질의 사회적 낙인

이상암,유희정,허경,박형국,신동진,송홍기,정원영,권오영,이성수,김요식,김성은,이병인 대한간질학회 2002 대한간질학회지 Vol.6 No.2

노년기 치매와 우울증의 유병률 및 위험인자

서국희,김장규,연병길,박수경,유근영,양병국,김용식,조맹제 大韓神經精神醫學會 2000 신경정신의학 Vol.39 No.5

경기도 연천군에 거주하는 만 65세이상 노인 1,037명을 대상으로 1996년 12월부터 1997년 8월까지 9개월간에 걸쳐 치매와 노년기 우울장애의 유병률과 위험인자에 관한 이 단계 역학조사(일차선별검사후 이차 진단적 면접)를 수행하였다. 다단계 층화집락표본추출에 의한 확률표본법으로 대상자 선정을 하였고, 반응률은 85.2%이 었다. 일차선별검사에는 노인정신장애 평가척도 한국어판(K-PAS)을 사용하였고, 일상생활 능력척도(ADL) 및 수단적 일상생활 능력척도(IADL)를 사용하여 기능을 평가했고, 지지도 척도(APGAR)를 사용하여 사회적 지지정도를 평가하였다. 이차 진단적 면접에서는 진 신장애의 진단 및 통계편람 제3판 개정판(DSM-III-R)의 진단기준을 따라 임상 진단을 확정하였다. 감별진단 및 장애 정도의 평가를 위하여 보조적인 진단도구들을 사용하였다. 1) 연령 보정된 치매의 유병률(%)[95% 신뢰구간]은 6.83[6.12∼7.54](남자 6.34[5.29∼7.40], 여자7.09[6.14∼8.04]이었다. 이중 알쯔하이머형 치매의 유병률(%)[95% 신뢰구간]은 4.17[3.61∼4.74] (남자 2.42[1.76∼3.08], 여자 5.31[4.48∼6.14]이었고, 혈관성치매의 유별률(%)[95% 신뢰구간]은2.38[1.95∼2.81](남자 3.46[2.67∼4.25], 여자 1.63[1.16∼2.10])이었다. 2) 연령 보정된 우울장애의 유병률(%)[95% 신뢰구간]은 10.99[10.11∼11.87](남자 7.59[6.44∼8.73], 여자 13.46[12.20∼14.73])이었다. 진단별로는 주요 우울장애의 유병률(%)[95% 신뢰구간] 이 7.50[6.76∼8.26](남자 4.42[3.54∼5.31], 여자 9.78[8.68∼10.88]), 기분부전장애의 유병률(%)[95% 신뢰구간]이 2.02[1.62∼2.42](남자 1.37[0.86∼1.87], 여자 2.46[1.88∼3.03], 달리 특정되지 않은 우울장애 유병률 (%)[95% 신뢰구간]이 1.49[1.15∼1.83](남자 1.85[1.47∼2.23], 여자 1.28[0.96∼1.60])이었다. 3) 알쯔하이머형 치매의 통계적으로 유의한 5가지 위험인자는 85셍상의 고령(O.R.= 10.27), 무학(O.R.= 4.01), 흡연[흡연년수 0.1∼30년(O.R.= 3.11), 흡연년수 30년 이상 (O.R.= 4.60)], 알코올남용(O.R.= 2.98)과 치매의 가족력 (O.R.= 4.85)이었다. 4) 혈관성 치매의 통계적으로 유의한 3가지 위험인자는 '무학' (O.R.= 3.78), 흡연[40년 이상 흡연년수 (O.R.= 11.15)]과 '뇌졸중의 과거력 (O.R.= 26.76)'이었다. 5) 우울장애의 통계적으로 유의한 3가지 위험인자는 '75∼79세 연령군' (O.R.= 2.87), '뇌졸중의 과거력' (O.R.= 3.33)과 '우울장애의 가족력' (O.R.= 7.16)이었다. 중심단어:알쯔하이머형 치매·혈관성 치매·우울장애·유병률·위험인자·흡연. An epidemiological survey was conducted to estimate the prevalence of and identify the risk factors of dementia and depression in the elderly between December 1997 and August 1998 in Yonchon County, Korea. A total of 1,037 elderly aged 65 years and over underwent a two phase diagnocstc procedure. Multiple stage, random cluster sampling method was used to select the subjects. Response rate was 85.4%. For the Ist stage screening survey, the Korean Psych-ogeriatric Assessment Scale was used as a primary screening tool, which had already been standardized in Korea, and functioning and social support were assessed by ADL, IADL and APGAR. At the 2nd stage, diagnoses were confirmed according to the DSM-Ⅲ-R. And several other scales were used as supporting information for differential diagnoses and for evaluating severity. 1) Age-sex adjusted prevalence(%)[95% C.I] of dementia was 6.83[6.12-7.54](male 6.34 [5.29-7.40], female 7.09[6.14-8.04]). Prevalence of the dementia of the Alzheimer's type was 4.17[3.61-4.74](male 2.42[1.76-3.08], female 5.31[4.48-6.14]) and that of the va-scular dementia was 2.38[1.95-2.81](male 3.46[2.67-4.25],female 1.63[1.16-2.10]). 2) Age-sex adjusted prevalence(%)[95% C.I.] of depressive disorder was 10.99[10.11-11.87](male 7.59[6.44-8.73], female 1346[12.20-14.73]. Among depressive disorders, prev-alence(%)[95% C.I.] of major depressive disorder was 7.50[6.76-8.26](male 4.42[3.54-5.31], female 9.78[8.68-10.88]), that of dysthymic disorder was 2.02[1.62-2.42](male 1.37[0.86-1.87], female 2.46[1.88-3.03]) and that of depressive disorder NOS was 1.49[1.15-1.83](male 1.85[1.47-2.23], female 1.28[0.96-1.60]). 3) Five statistically significant risk factors of the dementia of the Alzheimer's type were identified : age over 85(O.R. = 10.27), illiteracy (O.R. = 4.01), alcohol abuse (O.R. = 2.98), smoking [0 < pack year ≤30(O.R. = 3.11), pack year>30(O.R. = 4.60)] and family history of dementia (O.R. = 4.85). 4) Three statistically significant risk factors of the vascular dementia were identified : illiteracy (O.R. = 3.78), history of CVA(O.R. = 26.76) and smoking over 40 pack year(O.R. = 11.15). 5) Three statistically significant risk factors of the depressive disorder were identifed : age between 75 and 79(O.R. = 2.87), past history of CVA(O.R. = 3.33) and family history of depressive disorder(O.R. = 7.16). KEY WORDS:Dementia of the Alzheimer's Type·Vascular dementia·Depressive disorder·Prevalence·Risk factor·Smoking.

Adaptive Fuzzy Sliding Mode Control

Byung Kook Yoo(유병국),Sa Cheul Jeoung(정사철),Woon Chul Ham(함운철) 제어로봇시스템학회 1996 제어·로봇·시스템학회 논문지 Vol.2 No.4

제어이득의 하한을 이용한 새로운 슬라이딩 모드제어

유병국(Byung Kook Yoo) 제어로봇시스템학회 2003 제어·로봇·시스템학회 논문지 Vol.9 No.9

T-S 퍼지 모델을 이용한 비선형 시스템의 퍼지 슬라이딩 모드 제어

유병국(Byung Kook Yoo),양근호(Keun Ho Yang) 한국지능시스템학회 2004 한국지능시스템학회논문지 Vol.14 No.1

본 논문에서는 Takagi-Sugeno(T-S) 퍼지 시스템 모델을 이용한 비선형 시스템의 퍼지 슬라이딩 모드제어방식을 제안한다. 이 방식에서는 하나의 T-S 퍼지 모델을 구성하는 각 선형 동력학의 입력 이득행렬을 단일화 하는 과정을 필요로 한다. 이 과정에서 생성되는 입력 불확실성은 슬라이딩 모드 제어의 외란에 대한 처리 방법으로 해결될 수 있다. 또한 기존의 T-S 퍼지 모델에 대한 제어방식에서 처리하지 못했던, 상태변수에 독립적이기 때문에 선형화되지 않는 비선형 항에 대한 문제를 해결할 수 있다. 제안된 제어시스템의 안정도를 보이며 제어 입력이 슬라이딩 평면에 대한 도달조건을 만족함을 보인다. 제안된 제어방식의 타당성과 제어기 설계과정을 보이기 위하여 역진자 시스템에 적용한 시뮬레이션 결과를 보인다. This paper suggests the design and analysis of the fuzzy sliding mode control for a nonlinear system using Takagi-Sugeno(T-S) fuzzy model. In this control scheme, identifying procedure that the input gain matrices in a T-S fuzzy model are manipulated into the same one is needed. The input disturbances generated in the identifying procedure are resolved by incorporating the disturbance treatment method of the conventional sliding mode control. The proposed control strategy can also treat the input disturbances that can not be linearized in the linearization procedure of T-S fuzzy modeling. Design example for the nonlinear system, an inverted pendulum on a cart, demonstrates the utility and validity of the proposed control scheme.

퍼지제어구조 기반 적응 슬라이딩 제어

유병국(Byung Kook Yoo),함운철(Woon Chul Ham) 대한전자공학회 1999 대한전자공학회 학술대회 Vol.1999 No.6