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고분해능 투과전자현미경을 이용한 $A^{2+}$(Mg$_{1/3}$Nb$_{2/3}$)O$_3$,(A$^{2+}$=Sr$^{2+}$ and $Ca^{2+}$) 세라믹스의 구조연구
류현,남산,변재동,이확주,박현민,Ryu, Hyun,Nahm, Sahn,Byun, Jae-Dong,Lee, Hwack-Joo,Park, Hyun-Min 한국세라믹학회 1999 한국세라믹학회지 Vol.36 No.7
The crystal structure of A2+(Mg1/3Nb2/3)O3,(A2+=Sr2+ and Ca2+)ceramics was studied usig X-ray diffraction (XRD) and high resolution transmission electrion microscopy(HRTEM). Ba(Mg1/3Nb2/3)O3 (SMN) has the 1:2 ordered monoclinic structure which has the anti-phase tilt of octahedra. The type of tilting in SMN was considered to be a$^{\circ}$a$^{\circ}$c- or aac$^{\circ}$ Ca(Mg1/3Nb2/3)O3 (CMN) also has the 1:2 ordered monoclinic structure which was distorted by the anti-phase tilt or in-phsae tilt of octahedra. A unit cell containing both the in-phase tilt axis and anti-phase tilt axis was not observed in the CMN. Therefore CMN has the mixed phase consisting of the 1:2 ordered monoclinic phase with anti-phase tilt of octahedra and the one with in -phase tilt of ocatahedra,. The anti-parallel shift of cation was also observed in the CMN.
통합형 수리논술 지도 사례 -구체물과 공학적 도구를 활용한 원뿔곡선 수업-
류현아 ( Hyun Ah Ryu ) 한국수학교육학회 2013 수학교육논문집 Vol.27 No.4
대학 입학 전형에서 통합 논술이 시행되면서 학교 교사나 학생들은 통합 논술의 중요성을 인식하고 필요하다고 생각하지만 실제 교사들은 지도 방법의 어려움을 갖고 있다. 본 연구는 예비수학교사를 대상으로 통합 논술 지도를 위한수업의 사례를 통해 교육적 시사점을 도출해보고자 한다. 수업은 내용 지식으로서 수학에서의 원뿔곡선의 정의와 안테나 반사판의 설계에 적용된 원뿔곡선의 반사 성질을 주제로 하고, 수학사, 구체물, 종이접기, 컴퓨터 등을 이용하여학생들이 원뿔곡선의 정의와 성질을 발견하게 하였다. 이러한 교수·학습 과정에서 학생들은 수학사를 통해 수학적지식이 인간에 의해서 발명되었음을 이해할 수 있고, 정의나 명제를 만들고 정당화 해봄으로써 수학적 명제의 타당성을 평가할 수 있을 것이다. 또한, 발견한 성질들 사이의 관계를 논리적으로 기술할 수 있으며, 정당화 과정에서 이유나 근거를 설득력 있게 기술할 수 있다. 통합 논술을 지도함에 있어서 내용에 따라 다양한 접근의 수업 자료와 지도 방법에 대한 연구가 계속되어야 할 것이다. As integrated essay writing is performed in university entrance examinations, teachers and students recognize the importance of integrated essay, but teachers have still difficulties of teaching methods. The purpose of this study is to derive educational implications through case of mathematics instruction for integrated essay education to pre-service mathematics teachers. The content knowledge of this class is a definition of conic section in mathematics and properties of conic section in an antenna reflector. The students have to discover them using the history of math,manipulative material, paper-folding and computer simulation. In this teaching and learning process the students can realize mathematical knowledge invented by humans through history of mathematics. The students can evaluate the validity of that as create and justify a mathematical proposition. Also, the students can explain the relation between them logically and descript cause or basis convincingly in the process of justifying. We should keep our study to instructional materials and teaching methods in integrated essay education
커피전문점 직원의 언어적 · 비언어적 커뮤니케이션이 고객감정과 행동의도에 미치는 영향
류현아(Ryu, Hyun A),박기용(Park, KI Yong) 한국호텔외식관광경영학회 2015 한국호텔외식경영학회 학술발표논문집 Vol.- No.-
The purpose of this study is to reveal the influence of employee’communications on customer"s emotional response and behavioral Intention in coffee shop. through research, customer-centric service environment by presenting the elements as part of an effective marketing of the coffee shop want to be helpful. These hypotheses were conducted by using the statistics programs SPSS21.0 with 302 samples obtained from the empirical research. The results can be summarized as follows: First, an employee’communication is sensitive to impact customer sentiment. Second, customers have experienced emotions affect in the future. Implications of the study, as communication with the customers and employee aware of the sensitive topics with a focus on training manual requires the utilization of a continuous staff training.
접지판과 방사 패치 사이의 간격 변화에 따른 QMSA의 특성 연구
류현,박성교,박종백,Ryu, Hyun,Park, Sung-Kyo,Park, Chong-Baek 한국음향학회 1999 韓國音響學會誌 Vol.18 No.4
본 논문에서는 CHUKOH사의 CGP-500 PTFE 기판상에(유전율 2.6, 두께 1.6mm(±0.08)) 접지판의 폭과 방사 패치의 폭이 동일한 850MHz 대의 QMSA(Quarter-Wavelength Microstrip Antenna)를 설계·제작하였다. 실험에 의하여 가장 양호한 급전점을 선정하여 프로브 급전한 다음, 방사 패치와 그라운드 판과의 간격 L₃을 단계적으로 5mm씩 잘라가면서 QMSA의 공진 주파수와 반사 손실을 측정하였다. 그 결과, 간격 L₃이 좁아질수록, 특히 10mm 이하에서는 예상과 달리 공진 주파수는 증가하고 반사 손실은 감소하는 것을 알 수 있었다. In this paper, we designed and fabricated QMSA(Quarter-Wavelength Microstrip Antenna) for 850MHz band on the CGP-500 PTFE substrate(by CHUKOH company) with ε/sub r/=2.6, H=1.6mm(±0.08), where width of the radiation patch is .identical with that of the ground plane. A well matched feed point was obtained by experiments and this QMSA was fed by using prove feed method. The resonant frequencies and the return losses were mcasured by cutting the gap L₃ between the radiation patch and the ground plane, with a 5mm cutting length, step by step. As a result, we found that the measured return losses were decreased and the resonant frequencies were increased when the gap L₃ was shorter, especially under 10mm, unlike we had expected.
최승현,류현아,박지현,Choe, Seung Hyun,Ryu, Hyunah,Park, Ji Hyun 영남수학회 2015 East Asian mathematical journal Vol.31 No.2
Character means a person's nature and the mind and behavior to lead a desirable life personally and socially. Also character can be changed with education and environment. Therefore character education will be possible to do practice through various educational activities and life experiences in school. In other words, we think that students will get person's character required to lead a desirable life personally and socially beyond what they just learn knowledge and skill, enter the higher schools and succeed one's way. This study accepts merits of existing character education policy through subject(mathematics) education and focus on direction for character education through subject(mathematics) education for systematic and synthetic approach for practice of character education. For this, we will see applicability of the plan for character education in the whole subject education, in particular focusing on cases of character education in mathematics subject.
내용 : 초등 수학 학습 부진아 지도를 위한 맞춤형 학습 자료 개발 연구
최승현 ( Seung Hyun Choe ),조성민 ( Seong Min Cho ),류현아 ( Hyun Ah Ryu ) 한국수학교육학회 2012 初等 數學敎育 Vol.15 No.2
In this research, we observed how students perform as they followed the teachers`` instruction, and consequently perform their realized potential. As the accountability of school education is emphasized, various attempts try to disconnect the vicious cycle of producing low achievers. Efforts are allocated into developing a method to minimize cumulative effect of the lag in educational benefit by focusing on the elementary education. Based on the 2007 revised curriculum, mathematics achievement level and assessment criteria were developed. These criteria were used to standardize the course and assessment objectives for 4th through 6th grade students`` mathematics studies, and to assess lower performing students and the lag in their mathematical understanding. The educational materials and assessment criteria can be expected to lead lower performing students by giving them the personalized lesson plans to minimize the lag of mathematical understanding, and eventually expedite their progress and prevent cumulative effect of the lag in the following curriculum.
CRESST 형성평가 프로그램(PowerSource(c))의 효과성 - 중학교 1학년 대수 관련 내용을 중심으로 -
최승현,황혜정,류현아,Choe, Seung-Hyun,Hwang, Hey-Jeang,Ryu, Hyun-Ah 한국학교수학회 2010 韓國學校數學會論文集 Vol.13 No.2
미 연방정부 교육부로부터 재정지원을 받고 있는 평가 기준 검사 전문연구센터인 CRESST(The National Center for Research on Evaluation, Standards, and Student Testing at UCLA)에서는 지속적인 형성평가 실시에 따른 결과 반영을 통하여 교사의 수업 개선과 학생의 내용 숙달을 지원하고, 투입한 형성평가 프로그램의 교육 효과성을 검증하고자 하는 5년 일정(2007년~2011년)의 장기적 연구를 수행 중에 있다. 이를 위하여, 일차년도인 2007년에 대수 영역의 내용을 중심으로 중학교 1학년 자료를 개발하였으며, 개발한 자료를 그 해 7월부터 우리나라와 공유하면서 본격적으로 공동 연구가 착수되었다. 이차년도인 2008년도에는, 2009년의 본 연구에 앞서 사전적 의미에서의 연구가 실시되었다. 본 논문에서는 CRESST의 PowerSource(c) 프로그램을 토대로, 우리나라 중학교 1학년 학생들을 대상으로 하는 대수 영역 성취도를 분석하고, 해당 프로그램의 활용에 대한 교사와 학생의 반응을 탐색하고자 하였다. CRESST(the National Center for Research on Evaluation, Standards, and Student Testing at UCLA) is now carrying out the research, which was scheduled for a five year period from 2007 to 2011. This research aimed at testing the effectiveness of the formative assessment program by continuously conducting the program on the target group and steadily applying the recurring feedback, in order to reform the teachers' teaching and to facilitate students' learning. To do this, CRESST has set out to develop the material for 7th graders since January 2007, and KICE(Korea Institute of Curriculum and Evaluation) have been running a collaborated research since July 2007, while sharing the instructional materials developed by CRESST. In 2008, the pre-test was conducted prior to this study in 2009. Especially, this paper deals with the Korean 7th graders' scholastic achievements in algebra domain measured by PowerSource(c). In addition, this study would examine the responses of teachers and students on its application.