[청년의 눈으로 본 협동조합 ①] 글로벌 맥락에서의 협동조합 연구, 「ICA 국제 학술 컨퍼런스와 EURICSE 방문기」

이예나 한국협동조합연구소 2015 협동조합네트워크 Vol.- No.69

Strategies for Minimizing Glial Response to Chronically-implanted Microelectrode Arrays for Neural Interface

이예나,전상범 대한의용생체공학회 2014 Biomedical Engineering Letters (BMEL) Vol.4 No.2

For several decades, the intracortical penetrating microelectrodearrays have been widely employed for the purpose of neuralrecording and stimulation in nervous system. However, thelong-term application is limited due to the tissue reaction tothe implanted electrode array. The tissue response includesthe degeneration of nerve cells as well as the formation ofdense glial sheath adjacent the implanted electrode calledgliosis. The glial encapsulation deteriorates the capacity ofelectrodes to communicate with neurons by electricallyisolating the devices from the neighboring brain regions. Toexamine and overcome these critical obstacles of microelectrodearray for chronic applications, a number of studies have beenperformed to date including the reduction of electrode geometry,the use of flexible materials for electrode substrates, thepharmacological suppression of the cellular reaction, and theoptimized surgical techniques. In this review, the studies toclarify the mechanism of the glial response in central nervesystem (CNS) will be described and a variety of strategiesfor minimizing the glial responses in CNS will be examined.

Sintering of porous ceramic of diatomite according to molding pressure and PEG content

이예나,안석환,남호석,남기우 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.6

Diatomite powder, a naturally occurring porous raw material, was used to make ceramic materials with porosity and highstrength. The sintering behavior of the diatomite powder at various sintering temperatures suggests that diatomite monolithswith a high porosity and strength can be prepared at 1100 oC. The compressive strength of the sintered diatomite monolithsincreased as the sintering temperature increased, and the molding pressure of 2MPa and the binder of 18.6 wt.% wereexcellent. When the sintering temperature rises, the diatomite powder is melted, and its pores gradually disappear. SEMimages show that strengthening begins with the formation of inter-particle bonds at a low sintering temperature.

3차원 Arbitrary Lagrangian-Eulerian 기법을 사용한 자유 대기 중 폭발 해석의 최적 격자망 크기 산정

이예나,이태희,박다원,최영준,홍정욱,Yena Lee,Tae Hee Lee,Dawon Park,Youngjun Choi,Jung-Wuk Hong 한국전산구조공학회 2023 한국전산구조공학회논문집 Vol.36 No.6

폭발 수치해석 기법 중 Arbitrary Lagrangian-Eulerian(ALE)는 구조물의 파괴뿐만 아니라 폭발 이후 충격파의 전파 과정까지 관찰할 수 있는 장점이 있다. 그러나 동적 해석 시 유한요소 모델의 격자망 크기가 일정 수준 이하로 감소하게 되면 해석 결과의 신뢰도가 부정확해진다. 본 연구에서는 ALE 수치해석 기법을 활용하여 대기의 격자망 크기가 해석의 정확도에 미치는 영향을 조사한다. 다양한 조건의 격자망 크기와 폭발 중량을 갖는 대기 중 폭발모델을 구축하고, 폭발 중심으로부터 거리에 따른 폭발압력을 관찰한다. 수치해석과 실험에서 얻은 최대 폭발압력 결과에 대해 평균 제곱 오차를 계산하여 최적의 격자망 크기를 제안하고, 제안된 크기를 바탕으로 폭발물 중량과 대기의 최적 격자망 크기에 대한 상관관계를 분석한다. 본 연구는 다양한 중량을 가진 폭발물 해석에서 최적의 격자망 크기를 제공함으로써 신뢰성이 향상된 폭발 수치해석 모델 개발에 도움이 될 것으로 기대한다. The arbitrary Lagrangian-Eulerian (ALE) method has been extensively researched owing to its capability to accurately predict the propagation of blast shock waves. Although the use of the ALE method for dynamic analysis can produce unreliable results depending on the mesh size of the finite element, few studies have explored the relationship between the mesh size for the air domain and the accuracy of numerical analysis. In this study, we propose a procedure to calculate the optimal mesh size based on the mean squared error between the maximum blast pressure values obtained from numerical simulations and experiments. Furthermore, we analyze the relationship between the weight of explosive material (TNT) and the optimal mesh size of the air domain. The findings from this study can contribute to estimating the optimal mesh size in blast simulations with various explosion weights and promote the development of advanced blast numerical analysis models.

성격장애 평가에서 MMPI-2와 MPPI-2-RF 성격병리 5요인척도의 유용성 비교

이예나,김근향,박은희,최지영 한국건강심리학회 2017 한국심리학회지 건강 Vol.22 No.1

본 연구에서는 MMPI-2와 MMPI-2-RF의 PSY-5 척도 점수를 비교한 뒤 PSY-5 성격모델에 비추어볼 때 성격장애 군집별 특징이 어떠한지 탐색하였다. 이후 두 개의 PSY-5 척도가 성격장애를 평가하는데 갖는 유용성을 비교해보았다. 성격장애로 진단받은 154명의 정신건강의학과 환자중 A, B, C 성격장애군으로 진단된 환자들(각 군집별 54, 59, 41명)의 PSY-5 점수들을 다변량분석과 사후분석으로 분석하였다. 그 결과, MMPI-2와 MMPI-2-RF 모두 PSY-5 중 내향성 척도를제외한 모든 하위 척도에서 세 군집 간에 유의한 차이를 보였다. 사후분석에서 B군은 C군에 비해AGGR(AGGR-r), PSYC(PSYC-r) 척도 점수가 유의하게 높았고 A군과 C군에 비해 DISC (DISC-r), NEGE(NEGE-r) 척도 점수가 유의하게 높았다. 또한 C군은 MMPI-2에서만 DISC 점수가 A군보다 유의하게 낮았다. MMPI-2-RF의 PSY-5는 MMPI-2의 PSY-5보다 적은 문항으로 유사한 수준의 성격병리적 정보를 제공할 수 있을 것으로 시사된다. 연구의 한계점과 후속 연구를위한 제안 등이 논의되었다. The purpose of this study was to compare the clinical utility of the PSY-5 scales in the MMPI-2-RF and MMPI-2. According to the DSM-IV-TR, the sample consisted of cluster A, B and C personality disorder groups (N = 154). The results, based on multivariate ANOVAs showed that there were significant differences among the groups in the scales except for INTR (INTR-r). Post hoc analyses, Scheffe's and Dunnett's tests, revealed that cluster B scored higher than cluster C in AGGR (AGGR-r) and PSYC (PSYC-r). The scores of DISC (DISC-r) and NEGE (NEGE-r) in cluster B were higher than those of other groups. The results of the two PSY-5 scales were generally similar, but cluster C scored lower than cluster A in DISC of MMPI-2. The results suggest that the PSY-5 scale in the MMPI-2-RF can measure clinical range personality as much as the PSY-5 in the MMPI-2 with fewer questions. Implications and limitations of these findings are also discussed.

한국어 학습자를 위한 읽기 교재에서의 텍스트 매개하기 활동 구현 - 태국인 한국어 학습자를 위한 한국어 역사 읽기 교재에서의 적용 사례

이예나,박경남,황윤정 한국 리터러시 학회 2023 리터러시 연구 Vol.14 No.2

This study outlines the mediation activities implemented in a recently published history textbook for Thai learners of Korean. It aims to explore the possibility of developing and applying mediation activities in teaching and learning in Korean language education. This study hypothesized that learners’ cognitive difficulties caused by language barriers and the subject characteristics of the text could be addressed through mediation activities. Therefore, this study examined the mediation by focusing on the “mediating a text”, which can increase the connection between “reading” and the subject, in this case, “history.” Moreover, this study discussed the characteristics of each activity for “mediating a text” and its application in Korean language classes, with examples of each sub-activity beyond the textbook design. This study is significant as it builds on the concept of mediation, which was only vaguely presented in a curriculum, and suggests specific activities applicable to teaching and learning. 본 연구는 최근 발간된 태국인 한국어 학습자를 위한 역사 읽기 교재에서 구현된텍스트 매개하기 활동을 소개하고 한국어교육 교수 학습 현장에서의 매개 활동 적용및 발전 가능성을 모색하는 데에 목적이 있다.본 연구에서는 교재의 언어 기술 영역및 주제 특성에서 기인하는 학습자의 인지적 어려움을 매개 활동으로 완충시킬 수 있을 것으로 보았다.이에 ‘읽기’라는 영역과 ‘역사’라는 주제 영역과의 연계성을 높일수 있는 ‘텍스트 매개하기’ 활동에 집중하여 매개 활동을 살폈다.또한 본 연구에서는매개 활동에 기반한 교재 설계에서 나아가 텍스트 매개하기의 하위 활동 각각의 예를들어 각각의 활동의 특성과 한국어 수업에서의 적용에 대한 논의를 펼쳤다.본 연구는그동안 교육과정으로 막연히 제시되었던 매개라는 개념과 활동을 교수 학습 현장에적용할 수 있는 구체적인 활동을 제시하였다는 점에서 의의가 있다.

학습 동기가 학업 성취도에 미치는 영향과 자기효능감의 매개 효과

이예나 한국언어연구학회 2019 언어학연구 Vol.24 No.2

The study analyzed the effect of type of learners' learning motivation on their achievement in learning English. The mediating effect of self-efficacy was analyzed as a factor influencing the academic achievement. In addition, the study analyzed the difference in the effects according to the gender, grade, and major of English learners. The results showed that all types of learning motivation, including external motivation, intrinsic motivation, ideal motivation, and inevitable motivation, had a positive influence on academic achievement. The mediating effect of self-efficacy was found to be completely mediating in the process of external motivation affecting academic achievement. In addition, self-efficacy was found to have a full mediating effect even when inevitable motivation affects academic achievement. As a result of analyzing the effect of interaction with learning motivation using three variables--gender, major, and grade--as learner’s characteristics, only gender interacted with learning motivation and affected their grades in English

A PVA Film-based Fluorescent Sensor for HCl and NH₃ Gas Dection

이예나,조은비,이택승 한국고분자학회 2018 한국고분자학회 학술대회 연구논문 초록집 Vol.43 No.2

Experiences of Nurses Caring for Hemodialysis Patients: A Qualitative Meta-Synthesis Study

이예나,김은영 한국성인간호학회 2022 성인간호학회지 Vol.34 No.2

Purpose: We aimed to systematically review and synthesize qualitative evidence on the experiences of nurses caring for hemodialysis patients. Methods: We used Noblit and Hare’s meta-ethnography. Seven databases (PubMed, EMBASE, CINAHL, Web of Science, RISS, KISS, National Assembly Electronic Library) were used for the literature search. There were no restrictions placed on publication dates. A total of 10 studies published in English and Korean up until July 2021 were finally selected for review. Results: Three themes were identified from the literature review, which were then divided into six subthemes: acquiring the technical skills of hemodialysis, responsibility for prolonging patients’ lives, and maintaining stable hemodialysis in patients’ daily lives. Conclusion: The results of this study provide basic data that emphasizes the specific role of nurses in the hemodialysis unit, a specialized area of nursing, and can be utilized as educational material for hemodialysis unit nurse education.

The Effect of Storytelling Constructs on Consumer Attitude and Purchase Intention in Consumer Cooperatives

이예나,이상훈 한일경상학회 2014 韓日經商論集 Vol.65 No.-

In marketing field, story can be used as an effective communication tool conveying information of the company. This study aims to explore the potential of storytelling methods as a marketing communication tool for consumer cooperatives, and to analyze the effect of storytelling on consumer - as well as a member of cooperatives - attitude and purchase intention using an empirical study. Generally, consumers recognize that primary products producers have many difficulties in the process of production. This cognition can be basis to elicit consumers’ emotional attitude such as sympathy or empathy. Especially, consumer cooperatives in Korea have various policies to build a close relationship between producers and consumers. Therefore we assume that members of consumer cooperatives develop distinctive producer-consumer relationship and this could serve as a one of conditions under which storytelling–especially emotional one - appeals to consumers more effectively. For these purposes, we set three constructs of storytelling - main character of storytelling, message appealing type, and the object type of the message - as independent variables. We conduct five type of survey, each of which has a different test ad that includes differently combined elements of independent variables. We can summarize the results of the survey as follow. First, any kind of producer’s emotional storytelling has more influence on consumer attitude than producer’s rational one. Second, consumers feel friendlier toward producer’s emotional storytelling of primary product than that of processed product. Third, the relation between consumer attitude and purchase intention was shown positively. By finding conditions to utilize storytelling effectively, this study provides insights to consumer cooperatives and other organizations facing similar marketing condition.