超音速 流動場에 垂直 噴射되는 제트 特性硏究

김경련 忠南大學校 大學院 2003 국내석사

The conventional control systems of missile obtained flight control by using the controling wing with creating the moment. These systems have had two disadvantages ; the first is a time delay from the steering command to the target. Secondly, The effectiveness is decreased at high altitude because an aerodynamic control force is proportional to the air density and speed. But the use of side-jet can overcome these two disadvantages. When a secondary gaseous flow is injected vertically into supersonic flows through circular nozzle, it expands rapidly in freestream. The interaction of the two streams produces a strong bow shock wave on the upstream side of the side-jet. The bow shock wave and boundary layer interaction produces a region of boundary layer separation upstream of the side-jet. Separation shock wave produced by separation is sufficiently strong to be observed. A recompression shock wave is generated downstream the side-jet. The purpose of this study is to analyze the structure of flow fields and distribution of surface pressure on the flat plate which is produced by the interaction happened around the side-jet with total pressure ratio. The experiments are carried out in the supersonic cold flow system. The nozzle of main flow was designed at the exit in a Mach 2.88 and the shape of side-jet was a circular and sonic nozzle of 4mm diameter at the exit. In the experiments the flow fields are visualized by the schlieren method. The oil flow visualizations using a silicone oil and ink were conducted to analyze a flow field. Numerical simulation was also performed to study flow characteristics and interactions near the side-jet. The results are summarized as follows : 1. When underexpanded side-jet was injected normally into a supersonic flow, positive pressure on the upstream of side-jet and negative on the downstream of side-jet are occurred respectively. 2. If a secondary gaseous flow is injected vertically into supersonic flows a strong bow shock wave is displayed on the upstream of side-jet because the side-jet does a duty such as cylinder and pressure of the surface is increased quite due to happened separation shock wave and bow shock wave. 3. According to various P_(c)/P_(o) ; (P_(c) : total pressure of injected secondary flow, P_(o) : total pressure of freestream), The location of separation shock wave can be showed as follows : ◁표삽입▷ (원문을 참조하세요) 4. The more increased stagnation pressure of side-jet, the expander widely a gaseous flow of side-jet into a freestream, furthermore, it is easily a penetration into a freestream due to a high momentum. 5. The more distant toward Z-axis of side-jet, the decliner the distribution of surface pressure because separation shock wave and bow shock wave were occurred such as a parabola shape.

건축실내마감재에 따른 실내공기질 비교연구

김경련 경운대학교 산업정보대학원 2014 국내석사

This study is a comparison of indoor air qualities for three(3) different architectural interior finish composition contents based on measurement of six(6) important elements which are formaldehyde(HCHO), benzene, toluene, ethyl benzene, xylene, and styrene in between a normal wallpaper and hwangtoh(ocher) mortar finish material used in architectural structure made of cement blocks and cement mortar, and hwangtoh mortar finish material used in architectural structure made of hwangtoh blocks. As a result of the study, all three(3) different case of multi dwelling unit meet indoor air quality(IAQ) standard requirements. However, hwangtoh dwelling unit test result came out to be higher IAQ than the other materials, especially a normal wallpaper finish material used in a cement block wall and a cement mortar wall contains total volatile organic compounds(TVOCs) approximately 31 times more than hwangtoh mortar finish material used in hwangtoh block wall. From the perspective of hwangtoh dwelling unit with hwangtoh mortar finish that looks most excellent IAQ in buildings that do appear, but when hwangtoh mortar finish used in common cement architectural wall also have very close air quality levels of IAQ environment that may have be identified through this study. For information on the results of this study to comprehensively sum up as follows: 1) Indoor levels of formaldehyde(HCHO) measured in building #3(5.9㎍/㎥), building #2(11.7㎍/㎥), building #1(70.39㎍/㎥) in the order of superior indoor air quality and all three building IAQ satisfied with IAQ standard(210㎍/㎥). 2) Indoor levels of benzene measured in building #3(0.4 ㎍/㎥), building #2(0.5㎍ /㎥), building #1(1.1㎍/㎥) in the order of superior indoor air quality and all three building IAQ satisfied with IAQ standard(30㎍/㎥). 3) Indoor levels of toluene measured in building #3(31.6㎍/㎥), building #2(33.7㎍/ ㎥), building #1(328.0㎍/㎥) in the order of superior indoor air quality and all three building IAQ satisfied with IAQ standard(1,000 ㎍/㎥). 4) Indoor levels of ethyl benzene measured in building #3(N/A), building #2(0.1㎍/ ㎥), building #1(91.8㎍/㎥) in the order of superior indoor air quality and all three building IAQ satisfied with IAQ standard(360㎍/㎥). 5) Indoor levels of xylene measured in building #3(N/A), building #2(1.5㎍/㎥), building #1(77.9㎍/㎥) in the order of superior indoor air quality and all three building IAQ satisfied with IAQ standard(700㎍/㎥). 본 연구는 건축물의 실내 마감 재료에 따른 실내공기질의 차이를 살펴보고자 하는 것으로서 시멘트벽돌과 시멘트모르타르로 조성된 건축물에 일반적인 벽지로 마감한 경우와 황토모르타르로 마감한 경우, 그리고 황토벽돌과 황토모르타르로 만들어진 3가지 경우를 포름알데히드와, 벤젠, 톨루엔, 에틸벤젠, 자일렌, 스티렌 등의 6가지 주요요소를 바탕으로 상호 비교하였다. 연구의 결과를 살펴보면 실험대상인 3가지 유형 모두 공동주택에 대한 실내 공기질 권고 기준을 충족하는 것으로 측정되었지만 측정요소별로는 황토주택에 비해 높은 수치를 보이고 있으며 특히, 총 휘발성 유기화합물(TVOCs)의 측정량을 보면 시멘트벽돌과 시멘트모르타르로 벽체를 구성하고 벽지로 마감한 경우가 황토벽체와 황토모르타르로 마감한 경우보다 약31배나 더 많은 휘발성 유기화합물을 방출하고 있는 것으로 나타났으므로 실내 마감 재료의 적극적인 개선노력이 필요한 분명한 이유인 것으로 사료된다. 전체적으로 볼 때 황토주택에서 황토모르타르로 마감한 것이 가장 우수한 실내 공기질을 보이는 것으로 나타났지만 일반적인 시멘트로 건축물을 짓더라도 실내 마감 재료를 황토모르타르로 마감한 경우는 황토주택의 실내 공기질 수준에 가까워서 아주 좋은 실내 공기질 환경을 가질 수 있다는 것을 본 연구를 통해 확인 할 수 있었다. 본 연구의 결과에 대한 내용을 종합적으로 정리해보면 아래와 같다. 1) 실내의 포름알데히드(HCHO) 수준은 실험체 #3(5.9㎍/㎥), 실험체 #2(11.7㎍/㎥), 실험체 #1(70.39㎍/㎥)의 순으로 우수하였으며 3개의 실험체 모두 실내 공기질 권고기준(210㎍/㎥)을 충족하는 것으로 나타났다. 2) 실내의 벤젠 수준은 실험체 #3(0.4㎍/㎥), 실험체 #2(0.5㎍/㎥), 실험체 #1(1.1㎍/㎥)의 순으로 우수하였으며 3개의 실험체 모두 실내 공기질 권고기준(30㎍/㎥)을 충족하는 것으로 나타났다. 3) 실내의 톨루엔 수준은 실험체 #3(31.6㎍/㎥), 실험체 #2(33.7㎍/㎥), 실험체 #1(328.0㎍/㎥)의 순으로 우수하였으며 3개의 실험체 모두 실내 공기질 권고기준(1,000㎍/㎥)을 충족하는 것으로 나타났다. 4) 실내의 에틸벤젠 수준은 실험체 #3(불검출), 실험체 #2(0.1㎍/㎥), 실험체 #1(91.8㎍/㎥)의 순으로 우수하였으며 3개의 실험체 모두 실내 공기질 권고기준(360㎍/㎥)을 충족하는 것으로 나타났다. 5) 실내의 자일렌 수준은 실험체 #3(불검출), 실험체 #2(1.5㎍/㎥), 실험체 #1(77.9㎍/㎥)의 순으로 우수하였으며 3개의 실험체 모두 실내 공기질 권고기준(700㎍/㎥)을 충족하는 것으로 나타났다. 6) 실내의 스티렌 수준은 실험체 #3(불검출), 실험체 #2(3.7㎍/㎥), 실험체 #1(18.2㎍/㎥)의 순으로 우수하였으며 3개의 실험체 모두 실내 공기질 권고기준(300㎍/㎥)을 충족하는 것으로 나타났다.

키랄성 1,3 -Oxazolidin -2 -one을 이용한 α-아미노산의 비대칭 합성

김경련 고려대학교 1994 국내석사

海藻에 關한 化學的 硏究 : 褐藻類中의 灰分量및 鐵分定量

김경련 東亞大學校 1965 국내석사

노즐출구에 설치된 Ramp tab 형상에 따른 공기역학적 특성

김경련 忠南大學校 大學院 2016 국내박사

기계식 편향판인 램프 탭이 초음속 노즐 후류에 설치되면 배출가스를 가로막기 때문에 비행체의 추력손실을 크게 일으킨다. 이에 램프 탭은 초음속 노즐출구의 중심선을 기준으로 위쪽과 아래쪽 방향으로 움직여 램프 탭의 유동면적을 가변시킴으로써 추력크기를 조절할 수 있기 때문에 비행체의 호버링 상태를 유지할 수 있다. 이와 관련된 연구는 상대편을 속이기 위한 기만기를 개발한 호주를 제외하고 미국은 물론 일본, 러시아, 중국 그리고 국내에서도 아직 시도된 적이 없는 것으로 알려져 있다. 본 논문에서는 초음속 노즐 출구에 램프 탭을 대칭과 비대칭으로 설치한 상태에서 비행체의 추력크기, 방향전환과 공기역학적 특성을 고찰하기 위해 실험과 유동해석을 수행하였다. 특히 초음속 노즐 출구로부터 분출된 유동이 램프 탭에 충돌하여 램프 탭의 각 방향(Fx, Fy, Fz)에 작용한 유동하중, 추력손실 및 측력 분석 등을 통해 비행체의 방향전환과 호버링의 가능성을 확인하였다.

아버지의 양육참여도와 유아의 사회성 발달과의 관계

김경련 동국대학교 2016 국내석사

본 연구에서는 아버지의 양육참여가 유아의 사회성 발달에 미치는 영향을 알아보고자 하였다. 이에 본 연구의 연구 문제는 다음과 같다. 1. 아버지의 양육참여도와 유아의 사회성 발달의 일반적 경향성은 어떠한가? 2. 아버지의 일반적 특성(연령, 학력, 소득 등)에 따라 양육참여도는 어떠한가? 3. 아버지의 양육참여도(여가활동, 생활지도, 가사활동, 학습지도)와 유아의 사회성 발달과의 관계는 어떠한가? 이러한 연구문제를 검증하기 위하여 최경순(1992)에 개발한 아버지 양육참여도 척도가 본 연구의 목적에 맞게 수정, 보완된 것을 사용하였고, 유아의 사회성 발달에 대한 측정도구는 이위환(1994)이 사용한 유아사회성발달검사지를 사용하였다. 본 연구는 경주시와 울산시, 포항시에 소재한 유아교육기관(어린이집, 유치원)에 재원 중인 만4, 5세의 유아와 그 아버지를 대상으로 설문조사 방법을 실시하였다. 수집된 자료의 분석은 SPSS 20.0을 이용하여, 아버지와 유아의 일반적 특성과 아버지의 양육참여 실태를 파악하기 위하여 빈도분석을 실시하였고, 아버지의 일반적 특성에 따라 양육참여도에는 차이가 있는지, 유아의 일반적 특성에 따라 사회성 발달 수준에 차이가 있는 지를 알아보기 위해 t 검정과 일원변량분석을 실시하였다. 그리고 아버지의 양육참여도와 유아의 사회성 발달 간에의 관계를 알아보기 위해 상관분석을 실시하였다. This study discussed the impact of fathers' participation in childcare on young children's development of social skills. The topics of this study are as follows: 1. What is the relationship between fathers' participation in childcare and young children's development of social skills? 2. What is the tendency of fathers' participation in childcare based on their general demographics? 3. How does fathers' participation in childcare affect young children's development of social skills? In order to examine these topics of study, this study applied the fathers' participation in childcare index developed by Kyung Soon Choi (1992) and modified and corrected to fit the purpose of this study and the young children's social development survey form used by Wi Hwan Lee (1994) to measure young children's development of social skills. This study surveyed 4- and 5-year-old children attending early childhood institutes (daycare centers and kindergartens) located in Gyeongju, Ulsan, and Pohang, and their fathers. SPSS 20.0 was used to analyze the collected data and frequency analysis was performed to identify the general demographics of fathers and children and the fathers' participation in childcare. Then, t-test and one-way ANOVA were conducted to discuss whether the fathers' participation in childcare varies according to the general demographics and whether the young children's development of social skills varies according to their general demographics. The regression analysis was performed discuss the relationship between the fathers' participation in childcare and the young children's development of social skills. Considering the findings of this study, there was a static regression between the fathers' participation in childcare and the young children's development of social skills, but there was no statistically significant regression. However, fathers' participation in everyday guidance had a positive impact on the young children's development of social skills.

영어 문형의 연구

김경련 신라대학교 교육대학원 2006 국내석사

There are differences of sentence patterns between English and Korean. So it is necessary to teach sentence patterns to Korean students. The purpose of this study is to investigate the sentence patterns in English. Until now Onions' five sentence patterns have been applied to teaching English in middle and high schools. But his sentence patterns are not sufficient to explain various sentences. And students also have problems in studying English using Onions's sentence patterns. So this study searches complementary sentence patterns instead of Onions'. To be effective sentence patterns, it is necessary to satisfy several conditions. First, the number of sentence patterns is presented as few as possible. Second, the sentence patterns should include essential elements such as subject, object, complement etc. Third, the sentence patterns are classified to focus on not meaning but the form. Based on these conditions, in Chapter 3 several sentence patterns are presented ; sentence patterns of Onions, Honby, Cho Sung Sik and Quirk. Honby's sentence patterns can analyze various sentences and solve the problems of Onions' sentence patterns. But Honby's twenty five sentence patterns are too intricate to be adapted in English Classroom. And his sentence patterns are difficult to remember because of too many patterns. Cho Sung Sik's fifteen sentence patterns are more compact than Honby's. But they are also required to be much more compact to be applied in teaching English. In conclusion, this study suggests Quirk's seven sentence patterns. The patterns were summarized as follows; 1. S+V 2. S+V+O 3. S+V+C 4. S+V+O 5. S+V+IO+DO 6. S+V+O+OC 7. S+V+O+A Especially, he considers adverbs as indispensible in his sentence patterns. As a result, his sentence patterns can explain various sentences which are impossible to explain in the Onions' five sentence patterns. And his sentence patterns are to be easily adapted in English learning because of compact forms. Therefore this study recommend using the Quirk's sentence patterns for learning of English.

John Dewey의 民主的敎育에 關한 硏究

김경련 朝鮮大學校 敎育大學院 1989 국내석사

The purpose of this study is t o analyze b o t h the education thought and democratic education which are the Most central ideas in John Dewey's education, The concrete purpose of this study is as follows: (1) to analyze J. Dewey's tought of education, (2) to analyze J. Dewey's philosopi of education, (3) to analyze the idea of democratic education, (4) to establish the suggestiveness of J. Dewey's idea of democratic education to modern education. Dewey means 'education' as 'life' 'Social function', and 'growth' in Democracy and Enducation. Democracy is in itself regarded as an educational principle. Dewey's idea of democratic education is an idea more than a Kind of politica education and lies on the assumption that educational process is democratic. Democratic education is not a notion or an injection of viewpoint but it means using democratic method energetically and actively is democratic schools. Dewey's Concept of 'democratic education' was discussed by R. H. Hutchins and R. S. Peters, Hutchins, claim that Dewey's concept is intellectually inadequate. The writer hopes that this study will be a stimulant for the better climate of Korean education suffering from no less poverty of ideology than non-democratization of education and absence of educational policy.

舞踊 專攻 學位 取得者들의 進路에 대한 理論的 硏究

김경련 漢陽大學校 1992 국내석사

A Study of continuous function with hyperreal numbers

김경련 s.n.] 1984 국내석사