비대칭 동조질량감쇠기를 활용한 바닥진동제어의 강건성 향상 방안

고아라,이철호,김성용,Ko, A Ra,Lee, Cheol Ho,Kim, Sung Yong 한국강구조학회 2014 韓國鋼構造學會 論文集 Vol.26 No.3

최근 강재의 고강도화를 통한 부재 단면 사이즈의 절감은 종종 강성의 부족으로 이어져 과도한 처짐이나 진동문제를 야기한다. 따라서 적절한 설계나 예방을 통해 구조물의 바닥진동에 대한 보완이 필수적이다. 이러한 바닥진동 문제를 해결하기 위해 동조질량감쇠기가 종종 쓰이고 있다. 동조질량감쇠기는 바닥의 진동수에 대해 정확히 설계되었을 때에는 효율적으로 바닥진동을 제어할 수 있다. 하지만 바닥질량의 크기와 외부하중의 특성에 따라 바닥의 진동수가 수시로 변하는 경우에는 그 효율이 급격히 낮아질 가능성이 있다. 이러한 현상을 동조이탈이라고 한다. 본 연구는 실제 바닥에 가해지는 하중의 변화에 따라 바닥의 진동수가 달라지는 양상을 실험을 통해 고찰한다. 실험 바닥에 기존의 단일동조질량감쇠기를 적용하여 단일동조질량 감쇠기의 한계인 동조이탈현상을 확인한다. 또한, 바닥진동제어의 강건성을 확보하기 위해 진동수의 불확실성을 반영한 비대칭 동조질량감쇠기의 활용을 제안한다. TMD의 강건성이란 진동수가 변화하는 상황에서 바닥진동제어 성능이 얼마나 지속되느냐를 뜻한다. 제안된 비대칭 TMD는 두 개의 비대칭 강성을 가지고 있기 때문에 병진운동과 회전운동을 하면서 진동에너지를 소산한다. 제안된 비대칭TMD의 최적화 결과, 비대칭TMD는 기존 STMD에 비해 28%이상의 진동제어성능을 확보하였으며, 외부의 환경 변화에 대한 강건성은 약 1.4배 개선되었다. When floor vibration problems occur in existing buildings, TMD (tuned mass damper) can be a viable alternative to resolving the problem. Only when TMD has been exactly tuned to the natural frequency of the floor, it can control the vibration as intended in design. However, TMD gets inefficient in the situation where the natural frequency changes as a result of the uncontrollable variation of the floor mass weight. This physical phenomenon is often called as TMD-off-tuning. This study proposes asymmetric TMD for enhancing the robustness of floor vibration control against uncertain natural frequencies. The proposed TMD features two asymmetric linear springs such that the floor vibrational energy can be dissipated through both the translational and rotational motion. An easy-to-use graphical optimization method was developed in this study. The asymmetric TMD proposed outperformed in vibration control by 28% compared to that of conventional TMD. The robustness of asymmetric TMD of this study was two times higher than that of conventional TMD.

드론 산업 인재 유입 및 양성을 위한 STEAM 드론 캠프 제안

고아라(Ara Ko),배진아(JinAh Bae),조정원(Jungwon Cho) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.6

특수교육 분야 국내 내러티브 탐구 동향분석(2000~2021)

고아라(Ara Ko),홍재영(Jaeyoung Hong) 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.11

목적 이 연구는 국내 특수교육 분야의 내러티브 탐구 동향을 분석함으로써 향후 특수교육 분야에서 내러티브 연구를 실행하고자 하는 연구자들에게 기본 정보를 제공하고 연구의 방향에 대한 단초를 제공하는 것을 목적으로 한다. 방법 이를 위해 2000년부터 2021년까지의 국내 특수교육 분야의 내러티브 탐구 연구 51편을 분석하였다. 분석을 위해 선행연구를 기반으로 분석 준거를 설정하였으며, ‘학술지, 발행 연도, 연구 참여자, 참여자 수, 연구 주제, 장애 영역, 참여자 수, 자료형성 방법, 면담 기간 및 횟수’를 준거로 동향을 분석하였다. 결과 분석 결과 분석대상 논문 중 6편(11.8%)이 ‘유아특수교육연구’, 5편(9.8%)이 ‘특수교육저널: 이론과 실천’에 실려 있어 51편의 논문 중 11편(21.6%)이 2개의 학술지에 게재되어 있었다. 발행 연도는 2004년 1편을 시작으로 2021년에 8건이 발행되어 내러티브 탐구 연구의 증가 추세를 확인할 수 있었다. 연구 참여자는 특수교사 24편(40.7%), 일반교사 12(20.3%)편으로 교사 참여 연구가 많았으며, 참여자의 수는 3명(25.5%), 1명(21.6%), 2명(15.7%)으로 1~3명인 경우가 다수를 차지했다. 연구 주제는 교육과정 및 수업, 통합교육과 같은 직접적인 학생 지도를 주제로 한 연구가 많았다. 장애 영역의 경우 특정 장애 영역을 한정하지 않고 장애 전반을 다룬 연구가 26편(46.4%)으로 다수를 차지했으며 단일 장애 영역으로는 시각장애, 중복장애가 각 5편(8.9%)으로 가장 많았다. 자료형성 방법은 개별 면담과 현장 자료를 함께 수집한 경우가 33편(64.7%)으로 절반 이상을 차지했다. 면담 기간은 1개월 미만에서 12개월까지 고른 분포를 보였으며, 개별 면담 횟수는 3~4회가 17편(27.4%)으로 가장 많았다. 결론 이러한 결과를 바탕으로 향후 특수교육 분야에서의 내러티브 탐구의 발전을 위한 시사점을 논의하였다. Objectives The purpose of this study is to provide basic information to researchers who want to carry out narrative inquiry in the field of special education in the future. Methods 51 narrative studies in the field of special education in Korea were analyzed from 2000 to 2021. For analysis, analysis criteria were established through a review of prior research, and based on this, analyzed by journal, publication year, research participants, number of participants, research topics, disability area, number of participants, data formation methods, interview period and number of times. Results As a result of the analysis, 11.8% of the papers to be analyzed were published in ‘Korean Journal of Early Childhood Special Education’ and 9.8% in ‘Journal of Special Education: Theory and Practice,’ with a total of 21.6% published in two journals. The publication started with 1 paper in 2004, 8 papers were published in 2021, confirming the increasing trend of narrative inquiry research. As for the participants, 40.7% of special education teachers and 20.3% of general teachers were involved in the study. the number of participants was 1~3 people accounting for the majority. Most of the research topics were instruction and curriculum operation experiences. In the case of the disability area, 46.4% of the studies dealt with the overall disability without limiting the specific disability area, and 8.9% of the single disability area were visual impairment and Multiple disability, respectively. As for the data formation method, 64.7% of them collected individual interviews and field text together. The interview period showed an even distribution from less than 1 month to 12 months. As for the number of individual interviews, 3~4 times were the most at 27.4%. Conclusions Based on these results, implications for the development of narrative inquiry in the field of special education in the future were discussed.

직접메탄올 연료전지를 위한 박막형 나노복합 전극구조 분석

고아라(Ko, A-Ra),한상범(Han, Sang-Beom),송유정(Song, You-Jung),이종민(Lee, Jong-Min),김지연(Kim, Jy-Yeon),이영우(Lee, Young-Woo),박경원(Park, Kyung-Won) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06

RF-스퍼터링법을 사용하여 메탄올 산화반응을 위해 박막형 전극을 제조하였다. 전극은 텅스텐 탄화물(WC)과 텅스텐 산화물(WO₃), 그리고 백금(Pt) 타겟을 이용하였으며 그 구조적 특성과 전기화학적 특성을 TEM(Transmission electron microscopy와 CV(Cyclic Voltametry)를 통하여 촉매적 활성을 측정해 보았다. 같은 양의 백금과의 활성을 비교하고 활성을 확인하였다.

독자 반응 기반 그림책 리텔링 지도 모형 개발: 읽기,말하기 중심으로

고아라 ( A Ra Ko ),허근 ( Keun Huh ) 한국현대영어영문학회 2014 현대영어영문학 Vol.58 No.2

This paper aims to develop a picture book retelling Reading ; Speaking Instruction Model through the use of Reader- Response. As language teaching and learning materials, picture books are valuable resources for young language learners. When picture books are used in English teaching, they can help students to understand the stories better with picture clues. Providing the opportunity to read picture books repeatedly supports language learners in building strong background knowledge for understanding the text given. In addition, story retelling is another creative language activity. In a story retelling activity, young learners read a picture book several times with the teacher, and they try to retell it using their own words and background knowledge. It can easily lead to various language learning activities and help learners to practice speaking skills in class. In this study a practical picture book retelling, reading, and speaking model for young language learners was developed based on reader-response. It includes several activities that are designed to enhance young learners`` reading and speaking abilities. (Hannam University)

장이의 여행기에서 나타난 고향 의미와 작가 의식 ― 장이의 초기와 후기 여행기의 비교를 중심으로

高雅羅 ( Ko Ahra ) 중국어문연구회 2021 中國語文論叢 Vol.- No.105

Chiangyee had wandered all around the world, starting from England in 1933 and written many travel essay. Since 1930’s, he had presented his travel note titled ‘The Silent Traveller.’ England and US were his stomping grounds and it’s noteworthy that he started his literary career for the first time and bring the end in these two countries. From this perspective, this study aims to understand his literary world in other countries, especially targeting the England and US, and to discover his journey in the West and how his cosmopolitanism was embedded in his Diaspora literary works. He might have found his national identity and loved his homeland in the China Town located in the England and US. But the labyrinth of isolation, exclusion, and nostalgia always lingered on his heart. As he had to live separately in the England and US, it drove changes in his writing style and identity. The England was considered as ‘his second home’ but ‘somewhere he’s aware of limitation as an alien in the unfamiliar western world. However, the States can be interpreted as a place where guarantees writer’s freedom and provides opportunity to be a cosmopolitan. Chiangyee evaluated modern civilization of the US/the West on negative side, working on his writings but took balanced approach to harmonize the East and West. In fact, his writings had received attention from many readers in the West, rather than the East. But only few study was carried out enough for his accomplishment to pursue harmony of the East and West in the East Asia. Chiangyee, a Chinese writer in the States must be considered as an world-renowned writer to be focused not only by the literary world in the West, but also in S. Korea as well in the Diaspora, the supranational era. In this context, this study is expected to provide extensive, critical interpretation on Chiangyee in future.

시각장애학교에서 음악교과를 가르치는 교사의 수업 전문성 탐구 과정에 대한 자문화기술지

고아라(Ko A Ra),홍재영(Hong Jae Young) 한국시각장애교육재활학회 2021 시각장애연구 Vol.37 No.3

연구 목적: 이 연구는 시각장애학교에서 음악을 가르치는 교사가 겪은 경험을 면밀히 살펴보고, 이러한 경험을 통해 수업전문성을 탐구해가는 과정을 알아보는 데 목적이 있다. 연구 방법: 연구 목적 달성을 위해 자문화기술지 방법을 활용하였다. 연구 결과: 첫째, 연구자로서의 나는 음악수업 전문성의 부족과 특수교사로서의 전문성 부족을 마주했다. 둘째, 연구자로서의 나는 음악수업 전문성 향상을 위해 음악적 기능과 지식을 함양시켜 나갔으며 음악수업을 통해 실천적 지식을 축적해나갔다. 또한 반성적 사고를 행하며 수업의 질을 개선해나갔으며 사회적 지지 속에서 수업 전문성 계발을 지속하고 보다 다양한 수업을 시도하기 위한 토대를 마련할 수 있었다. 결론: 이러한 연구를 통하여 시각장애학교에서 음악 교과를 가르치는 교사의 수업 전문성 함양 및 시각장애학교 음악수업의 질 개선에 대한 시사점을 도출할 수 있었다. 이 연구의 결과는 향후 시각장애학교 음악수업의 질 개선에 필요한 기초 정보를 제공하는 데 기여할 수 있을 것이다. Purpose: This study closely examines the experience of teaching a music class at a school for the visually impaired and investigates the process of nurturing the expertise practical knowledge through such an experience by using autoethnography. Method: The autoethnography research method was used in order to achieve the research objective. Results: First, I was faced a lack of expertise on music classes and a lack of expertise as a special teacher. Second, I was developed musical skills and knowledge to improve my expertise in music classes and accumulated practical knowledge through music classes. It also improved the quality of the class through reflective thinking and was able to continue to develop class expertise under social support and lay the foundation to try more diverse classes. Conclusion: Through this research, I was able to draw implications on nurturing the expertise of music teachers and improving the quality of music classes at a school for the visually impaired. The research findings are expected to provide the preliminary data necessary to enhance the quality of music classes at a school for the visually impaired.

관리조방형 옥상녹화지의 동,식물상 변화

고아라 ( Ah La Ko ),이은희 ( Eun Heuii Lee ) 한국환경생태학회 2010 한국환경생태학회지 Vol.24 No.3

본 연구는 기 조성된 옥상녹화지의 동·식물상 모니터링을 통해 옥상녹화지의 생태적 변화를 관찰하기 위한 목적으로 수행되었다. 대상지는 서울여대 행정관 옥상녹화지역으로 조성 당시인 2005년과 2009년 현재 식재 식물의 생존여부와 이입식물, 출현 동물군 중 곤충을 중심으로 비교·분석하였다. 식재당시인 2005년의 경우, 식물은 식재종 26과 100종이었으나, 2009년 조사 결과 23과 62종으로 나타났다. 이 중 식재식물은 14과 40종으로 줄었으며, 이입식물은 11과 22종이 출현하였다. 곤충은 2009년 총 9목 7과 21종이 출현하였으며, 육안조사법으로 8목 15과 19종, 먹이 유인포획법으로 5목 5과 5종이 발견되었다. 곤충은 주로 비행하여 대상지에 출현한 것으로 보이며, 문헌조사로 밝혀진 곤충의 특성과 연관하여 분석한 결과 대상지의 식물을 식수로 이용하거나, 서식처로 사용하는 등 식물과 밀접한 연관성을 보였다. The purpose of this study is conducted to examine the change of flora and fauna in the extensive rooftop green area from 2005 to 2009. The experimental site is on the rooftop green area of Seoul Women`s University which was constructed in 2005. This research was consisted of four parts: soil, potted plants, invading plants and small animals especially insects. The plants were surveyed by enumeration, while animals were surveyed by two methods which are `Netting and Searching` and `Pit fall trap`. The initial group of plants planted in 2005 was 100 species of 26 families whereas in 2009 there were 62 species of 23 families including 22 invading species of 11 families. In case of insects in 2009, 21 species of 7 families (9 orders) were detected; 19 species of 15 families (8 orders) were discovered by `Netting and Searching` and 5 species of 5 families (5 orders) by `Pit fall trap`.

구조BIM 기반 철골접합부 자동화 설계시스템 개발

고아라(Ko, A-Ra),이승일(Lee, Seung-Il),조영상(Cho, Young-Sang) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.2

As a way to improve productivity in construction industry, BIM(building Information Modeling) based on parametric method is being studied and applied recently. Structural BIM among BIM enable the flexible environment promptly by providing structural analysis and design, structural member modeling, generation of drawing, quantity takeoff ect in integrated environment. Current work process of steel structure applying structural BIM has been performed for main member except connection parts. However entire steel structure including the connection has a number of limitations. Integrated work process also, is utilized as limited result of steel main member generated structural analysis result and geometric data in structural analysis and design phase. Accordingly, Generation of Integrated information model including connection and integrated structural BIM process management are required through more research on generating analysis result of steel connection and connection design, detailed model etc. This study presented work process in each stage on steel connection based on structural BIM for follow-up work through auto generation of connection information model and efficient design of steel connection in design phase of steel structure, and proposed the integrated design system for executing work process. Furthermore a case study was performed by using the process in an actual project.

중장년 1인 가구의 사회경제적 박탈이 우울에 미치는 영향에 관한 종단 연구: 다인 가구와의 비교를 중심으로

고아라 ( Ko A Ra ),정규형 ( Jeong Kyu Hyoung ),신보경 ( Shin Bo Kyoung ) 한국가족사회복지학회 2018 한국가족복지학 Vol.59 No.-

The aim of study to compare the change trajectory of socioeconomic deprivation and depression the middle-aged in the single-person household and that in the Multi-person Household and to confirm the difference between the two groups. It is to examine the Longitudinal relationship between socioeconomic deprivation and depression. To do so, we studied 4,212 single-person household and Multi-person Household cases in the 7th to 11th Korea Welfare Panel Study (2012∼2016). To verify the difference between both groups, we go on analysis with the latent growth curve model. According to our analysis, it is confirmed that the socioeconomic deprivation and depression of single-person households is higher than those of Multi-person Household and thus there is meaningful difference between both groups. Also, we reveal that the socioeconomic deprivation of Multi-person Household tends to decease while that of single-person household doesn’t decline significantly. Furthermore, it appears that the socioeconomic deprivation is directly proportional to the depression in both groups. This research has meaningful significance in that we discussed in depth the relationship between the socioeconomic deprivation and depression of both groups, suggesting that welfare approach should be needed in the middle-aged in the single-person household.