비위관 영양 수기술 표준지침 개발 및 적용 효과

유연아,안선지,옥자은,김정애 한국의료QA학회 2008 가을학술대회 Vol.2008 No.2

콜라겐을이용한 생체재료의 특허동향

유연아,Yu, Yeon-A 한국특허정보원 2005 Patent 21 Vol.63 No.-

어머니의 言語形態가 幼兒의 言語能力에 미치는 影響

유연자(Yen Ja You)(劉蓮子),이달석(Dal Seok Lee)(李達錫) 조선대학교 교과교육연구소 2002 敎科敎育硏究 Vol.23 No.1

The purpose of this study is to clarify the relationship between the mother s language pattern and infant s language ability and to analyze this by age and sex. The research problems of this study are as following : 1. In what shape does the mother s language pattern appear? 2. In what shape does the infent s language ability appear? 3. To what difference do the mother s lenguage patterns result in infent s language ability? 4. To what difference do the mother s lenguage patterns result in infent s language ability by sex? 5. To what difference do the mother s lenguage patterns result in infent s language ability by age? 91 children of kindergarten aged 3 and 5 age, and their mothers 91 persons in Gawng-Ju were enployed for subjects of this study, so total subjects of this study were 182 persons. Mother s language pattern was categorized with Jung Ji-Ja s mother language pattern inventorg(1984). Infant s language abilities were got by Joo Young-Uis infant s language ability test(1982). Data were treated with using the package of Descriptives and T-test in SPSS/PC+ Major findings of this study were as follows : 1. In present situation of mother s language pattern, there is the most mother s normative-oriented language pattern, the second order oriented and the third person-oriented language pattern, so mother s persen-oriented language pattern is educated with parent s edu cation. 2. In present situation of infant s language ability, there is the highest perception ability and analusis, reasoning, integration in order. because infants is staged in preoperational period according to Jean Piaget s theory. 3. The infants interading with mothers using persen-oriented language have higher language ability than them with mothers using order-oriented language. 4. In case of male, mother s person-oriented language pattern let them cevelope their perception ability and in case of female, mother s person-oriented language pattern let then develope their reasning ability. 5. In case of 3 age of infants, mother s person-oriented language pattern let them develope perception abilty and in 5 ago of infonts, mother s person-oriented language pattern let Them develope their perception, analgsis, integration and reasning. 6. Comparing 3 with 5 ago of infant s language ability, 5 ago of imfant s language ability is far the best then 3 ago of infant s According to resalts of this study, mother s person-oriented language patter is the best instrument for developing infant language ability.

태양돛을 탑재한 초소형 위성 CNUSAIL-1의 궤도변화 분석

유연아,구소연,김승균,석진영 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11

태양돛은 태양 복사압을 이용하여 추진력을 얻는 추진체이며 다른 우주비행체와 달리 연료 없이 연속적으로 가속이 가능하다. 본 논문에서는 저궤도의 3U 큐브위성에서 전개된 태양돛의 수직축이 태양지향 또는 위성의 속도방향을 지향 할 경우의 큐브위성의 수명과 궤도 변화를 분석하였다. 먼저 태양돛 면적에 따른 임무수명을 분석하고 최적의 면적을 선정 하였다. 이를 통해 J2 섭동력과 자세 변화에 따른 태양 복사압 및 대기항력에 의한 궤도 운동 모델 알고리즘을 구현하였다. 또한 이를 토대로 태양지향모드와 궤도 재진입 모드에 대한 궤도 변화 시뮬레이션을 수행하고 이를 분석하였다. 위성수명은 태양지향 모드 모드의 경우 270일, 궤도 재진입 모드의 경우 120일로 확인되었다. Solar sails propel using solar radiation pressure that they can provide continuous accelerations without any chemical propellant. This paper describes the orbital variation for the cubesat in low Earth orbit when its normal axis to sail plane faces the Sun or parallel to the satellite velocity vector. First, the lifetime by changing sail area is analyzed and optimal area is determined. Algorithms for orbit dynamics considers J2 perturbation, solar radiation pressure, and aerodynamic drag. Based on this, the orbital variation is simulated for Sun-pointing and de-orbit mode. The lifetime is expected to be 270 days in Sun-pointing mode and 120 days in de-orbit mode.

아동의 모발 내 무기물 농도와 주의력결핍 및 과잉행동장애와의 상호연관성에 관한 연구

유연아,정문호 한국환경보건학회 2004 한국환경보건학회지 Vol.30 No.1

Attention Deficit Hyperactivity Disorder (ADHD) is one of the most general childhood problems occurs locally and internationally, but the causes of ADHD are not cleared yet. Therefore, this study tried to examine some parts of the causes of ADHD closely, and finally contribute to the medical treatment of ADHD and its precautionary measures, by measuring and comparing concentration of minerals in hairs of the patients of ADHD and their control group's children. which can analyze the relevance to ADHD and the mineral content in human bodies, and mutual relations between toxic minerals and essential minerals in human bodies. After collection of hairs from 200 children(5 to 7-year-old, boys: 159 girls:41) diagnosed as ADHD by medical specialists based on the standard of DSM-IV diagnosis and their control group's 177 children(boys: 138 girls:39), the mineral concentration of samples was measured through ICP-MS and compared. And correlations between toxic minerals and essential minerals in human bodies among patients group was analyzed. All the toxic minerals(Pb, Hg, Al, Cd, As) of hairs analyzed in the study showed more higher range of concentration in patients group in comparison with their control group. Among them, the concentration of Pb(3.27 $\pm$ 3.82 ppm) and As(0.16 $\pm$ 0.15 ppm) in patients group were significantly high compared to their control group. And in this study Pb among toxic minerals showed negative correlation with Zn(r = -0.43), Mg(r = -0.15) among essential minerals. Cd among toxic minerals showed negative correlation with Zn(r = -0.20) among essential minerals. As among toxic minerals showed negative correlation with Ca(r = -0.14) among essential minerals.

수인성 질산 급성 노출에 의한 향어, Cyprinus carpio nudus의 반수치사농도, 혈액학적 성상 및 혈장성분에 미치는 독성 영향

유연아,박슬기나라,김준환 (사)한국해양생명과학회 2023 한국해양생명과학회지 Vol.8 No.2

수인성 질산 노출에 대한 향어의 독성 영향을 확인하기 위해 96시간 동안 0, 4, 20, 100, 500 및 2,500 mg NO3-/L의 수인성 질산에 노출을 실시하였다. 질산 96시간 급성 노출에 의한 향어의 반수치사농도(LC50)는 1,433.54 mg NO3-/L로 나타났다. 혈액학적 성상을 통해 수인성 질산 노출이 향어에게 미치는 생리학적 변화를 평가하였으며, RBC count는 유의적인 감소를 나타내었다(p < 0.05). 혈장 무기성분을 통해 수인성 질산 노출에 따른 향어의 이온 조절 능력 변화를 평가하였으며, 혈장 무기성분에서 calcium과 magnesium은 유의적으로 감소하였다(p < 0.05). 혈장 유기성분을 통해 수인성 질산 노출로 인한 향어의 건강도와 스트레스 상태를 평가하였으며, 혈장 유기성분인 glucose는 유의적인 증가를 나타내었다(p < 0.05). 혈장 효소성분을 통해 수인성 질산 노출로 인한 간 손상도 및 효소 활성의 변화를 평가하였으며, 혈장 효소성분인 AST, ALT 및 ALP는 높은 수준의 수인성 질산 노출에서 유의적으로 감소하였다(p < 0.05). 본 연구의 결과는 C. carpio nudus에 대한 수인성 질산 노출이 생존율, 혈액학적 성상 및 혈장성분에 독성으로 영향을 미칠 수 있음을 의미한다. To determine the toxic effects of the mirror carp, Cyprinus carpio nudus on waterborne nitric acid exposure, they were exposed to waterborne nitric acid at 0, 4, 20, 100, 500, and 2,500 mg NO3-/L for 96 h. The semi-lethal concentration (LC50) of the scented fish by 96 hours of acute exposure to nitric acid was 1,433.54 mg NO3-/L. The physiological changes of waterborne nitric acid exposure on mirror carp were evaluated through hematologic properties, and RBC count showed a significantly decreased (p < 0.05). The change in the ion control ability of the mirror carp according to exposure to waterborne nitric acid was evaluated through the plasma inorganic component, and calcium and magnesium were significantly decreased (p < 0.05) in the plasma inorganic component. The health and stress status of the mirror carp due to exposure to waterborne nitric acid were evaluated through plasma organic ingredients, and the plasma organic component glucose showed a significantly increase (p < 0.05). Changes in liver damage and enzyme activity due to waterborne nitric acid exposure were evaluated through plasma enzyme components, the enzymatic activities of plasma AST, ALT, and ALP were significantly decreased (p < 0.05) in high levels of waterborne nitric acid exposure. The results of the present study suggest that waterborne nitric acid exposure to C. carpio nudus can toxicly affect survival, hematologic properties, and plasma components.

Attitude Control System Design & Verification for CNUSAIL-1 with Solar/ Drag Sail

유연아,김승균,석진영,김종래 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4

CNUSAIL-1, to be launched into low-earth orbit, is a cubesat-class satellite equipped with a 2 m × 2 m solar sail. One of CNUSAIL’s missions is to deploy its solar sail system, thereby deorbiting the satellite, at the end of the satellite’s life. This paper presents the design results of the attitude control system for CNUSAIL-1, which maintains the normal vector of the sail by a 3-axis active attitude stabilization approach. The normal vector can be aligned in two orientations: i) along the antinadir direction, which minimizes the aerodynamic drag during the nadir-pointing mode, or ii) along the satellite velocity vector, which maximizes the drag during the deorbiting mode. The attitude control system also includes a B-dot controller for detumbling and an eigen-axis maneuver algorithm. The actuators for the attitude control are magnetic torquers and reaction wheels. The feasibility and performance of the design are verified in high-fidelity nonlinear simulations.

언어의 유연성과 단어 형성

유연창 ( Yeon Chang You ) 한국스페인어문학회 2003 스페인어문학 Vol.0 No.26

El concepto de motivacio´n aparece en el Curso de lingu¨i´stica General estrechamente vinculado al problema de la arbitrariedad lingu¨i´stica. Alude Saussure con la motivacio´n relativa del signo al feno´meno gramatical de la composicio´n y derivacio´n de palabras. La palabra, rebelde a todo intento de definicio´n en lingu¨i´stica general, es el punto de partida de la hipo´tesis de Saussure, segu¨n la cual, cualquier lengua humana forma un entramado de relaciones y un sistema. En este marco de intereses teo´ricos situ´a Saussure su concepto de motivacio´n lingu¨i´stica. El motivo por el que `localizacio´n`, por ejemplo, no es un signo completamente arbitrario o inmotivado radica en el hecho de que podemos establecer asociaciones semiolo´gicas con otros signos, `localizar`, `reservacio´n,`instalacio´n, etc., con lo cual, tanto el sintagma mi´nimo como sus componentes pertenecen como entidades lingu¨i´sticas al plano de la lengua. La motivacio´n lingu¨i´stica se circunscribe en Saussure al ana´lisis de las unidades morfolo´gicias de las palabras complejas, mientras que las relaciones asociativo-sintagma´ticas guiara´n la construccio´n de la grama´tica un pincipio superior a la morfologi´a, a la sinaxis y a la sema´ntica: todo lo que compone un estado de lengua debe poderse reducir a una teori´a de los sintagmas y a una teori´a de las asociaciones. Estudiamos unos aspectos sinta´cticos y sema´nticos de los adjetivos en `-ble` y `-al`, las formas apreciativas y las palabras compuestas, siguiendo las directrices de la motivacio´n lingu¨i´stica.

새로운 것은 없다, 실현이 문제다

유연아 현대미학사 2011 공연과 리뷰 Vol.- No.73

곤충모방 초소형 날갯짓 비행체의 동역학 모델링 및 자세제어

유연아,서건희,김승균,조성봉 제어로봇시스템학회 2015 제어로봇시스템학회 국내학술대회 논문집 Vol.2015 No.5