통계적 에너지 해석법을 이용한 저궤도 지구관측위성의 음향-진동 연성 해석

이대은,장해원,한재홍,우성현,Lee, Dae-Eun,Jang, Hae-Won,Han, Jae-Hong,U, Seong-Hyeon 한국전산구조공학회 2009 전산구조공학 Vol.22 No.6

오토캠핑객의 방문동기와 행동의도 간의 몰입 역할 검증 - 조절효과와 매개효과를 중심으로 -

이대은,이수연,박득희 한국호텔관광학회 2016 호텔관광연구 Vol.18 No.1

Increasing leisure time Auto-camping is one of the outdoor recreation activities has been upwards in Korea. In this respect, this paper addresses the need to better understand auto camper’s behavior. The purposes of this study are three folds: 1) to identify visit motivation, flow, revisit intention of Auto-Campers; 2) to find relationship between the visit motivation and intention to revisit; and 3) to examine the mediator or moderator role of Flow in the relationship between the visit motivation and revisit intention. To this end, an online survey was conducted to auto campers who participated in auto-camping within 12 months. Data were analyzed using exploratory factor analysis, hierarchial multiple regression analysis with the SPSS program. The followings are the main results. First, factor analysis delineated 7 dimensions of auto-camping visit motivations from 35 items of motives: ‘Socialization’, 'Novelty', 'Dignity and Achievement', 'Escape', 'Nature Friendship', 'Convenience of Facilities', and 'Accessibility'. Second, this study confirmed the relationships between visit motivation and revisit intention. The results from the regression analysis indicated that there were significant effect of visit motivations on revisit intention. Third, the mediating effect of flow existed between ‘socialization and escape’ and revisit intention. Finally, the flow also played a role as a moderator variable between visit motivation, socialization, Dignity & Achievement, Convenience of Facilities, and Accessibility, and revisit intention of auto campers. Based on the results of this study, marketing implications and strategies for auto-camping developer were provided in the conclusion section.

Theoretical Migration Estimation of Acetaldehyde and Butyraldehyde from Polyethylene Terephthalate (PET) into Fermented Food Simulants

이대은,전현표,김상훈 한국환경보건학회 2016 한국환경보건학회지 Vol.42 No.3

Objectives: Materials coming into contact with food may result in the migration of chemical substances into thefood. To protect consumers from exposure, Regulation (EU) No. 10/2011 specifies the use of standard migrationtests. Polyethylene terephthalate (PET), widely used for food packaging materials, has drawn the attention ofresearchers because unwanted migration of PET into food might occur when consumers reuse packagingmaterial. The aim of this study was to predict and develop a migration model for two components, acetaldehydeand butyraldehyde in PET, into food simulants under conditions of changing pH and solvents, such as thoseobserved in fermented foods like kimchi or sauerkraut. Methods: Using a migration model based on Fick’s second law of diffusion in one dimension, the migration ofacetaldehyde and butyraldehyde from PET into a simulant of fermented food at 20 °C over 10 days wasevaluated. The simulant for fermented food was modelled as 10% ethanol for three days, followed by 3% aceticacid for seven days. Results: The migration of acetaldehyde into the 10% ethanol was 0.36 times that of a simulated fermented foodsystem, while that of butyraldehyde was 1.34 times greater. These results may have been influenced by thechemical interactions among the migrants, polymers and simulants, as well as by the solubilities of the migrantsin polymers and simulants. Conclusion: Because food simulants have a limited capacity to mimic real food systems under the currentmigration model, an appropriate simulant and migration test should be considered in the case of increasingacidity. Furthermore, since the accuracy of the worst-case estimation of migration predicted by the current modelis severely limited under changing food conditions, food simulants and their interactions should be furtherinvestigated with respect to conservative migration modelling.

제2형 당뇨병 환자의 1일과 3일 평균 식이섭취량의 일관성과 혈당, 당화혈색소, 체질량지수, 지질과의 관련성

이대은,이해정,이상은,이민진,강아름 한국기초간호학회 2023 Journal of korean biological nursing science Vol.25 No.1

Purpose: This study aimed to determine the consistency of 1-day and 3-day average dietary intake using the 24-hour diet recall method and to investigate the relationship of diet intake with physiological indicators potentially associated with diabetic complications in patients with diabetes. Methods: This study conducted a secondary data analysis using pretest data of a nursing intervention study entitled “Development of deep learning based AI coaching program for diabetic patients with high risk and examination of its effects.” Data were analyzed through descriptive analysis, one-way repeated-measures analysis of variance, and Pearson correlation coefficients using SPSS 26.0. Results: The average total daily calorie intake over 3 days was 1,494.48 ± 436.47 kcal/day: 1,510.90 ±547.76 kcal/day on the first day, 1,414.22 ± 527.58 kcal/day on the second day, 1,558.34 ± 645.83 kcal/day on the third day, showing significant differences (F = 3.59, p = .031). The correlation coefficient between the 1-day and 3-day average dietary intake was 0.41-0.77 for each nutrient and 0.62-0.80 for each food group. Vegetable intake showed negative correlations with body mass index (BMI; r = -.19, p = .023) and triglycerides (r = -.18, p = .036), whereas dairy intake was positively associated with low-density lipoprotein-cholesterol (LDL; r = -0.18, p = .034) and triglycerides (r = .40, p<.001). Conclusion: This study demonstrated that 1-day dietary intake was highly correlated with 3-day average dietary intake using the 24-hour diet recall method. Food groups showed significant associations with physiological indicators of potential diabetic complications such as BMI, triglycerides, and LDL levels. Further studies are needed to improve the knowledge base on the relationships between physiological indicators and food groups.

차륜교환주기 예측을 통한 차륜교환량 수급계획 신뢰성확보에 대한 연구

이대은,구정서 한국안전학회 2021 한국안전학회지 Vol.36 No.6

Planning of the annual demand and supply of wheel exchanges should be based on accurate data. However, in several cases, supply and demand exceed the planned amounts every year. To manage such cases, six linear regression models were designed using Scikit-Learn, a Python-based machine learning library, to identify characteristics such as wheel thickness (mm), mileage (km), number of trips, flange thickness (mm), and flange wear (mm). Among these models, RandomForestRegressor, which yielded the best performance evaluation index for the model and the most accurate prediction in the verification of new data in terms of root mean square error and R-Squared values, was selected as the predictive model. By using this final model to accurately predict the wheel exchange cycle, we intend to secure the reliability of the wheel exchange demand and supply plan. -

외래관광객의 한옥 방문동기와 만족도 및 행동의도에 관한 연구 - 동․서양간 비교를 중심으로 -

이대은,이충기 한국관광학회 2012 관광학연구 Vol.36 No.9

Korean Traditional Houses (Hanok) provide unique heritage experience for visitor in South Korea. In light of the increasing popularity of Hanok’s, this study aims to further identify foreign tourists’ motivation for Hanok experiences, to examine any significant differences in motivation between Asian and Western visitors, and to investigate the relationships between motivation, satisfaction, and behavioral intention. To this end, an online survey was conducted to foreign visitors who stayed at T-Guest house in Bukchon, Seoul. Factor analysis delineated six dimensions of Hanok motivations from 24 items of motives: Cultural exploration, Escape, Socialization, Family togetherness, Hanok experience, and Novelty. The results of t-test indicate that there was a significant difference in motivation between Asian and Western visitors. The results of regression analysis reveal that the motivation factors of Cultural exploration, Socialization, Hanok experience and Novelty had a significant effect on visitors’ satisfaction and behavioral intention. Furthermore, Z-test show that the coefficient of Hanok experience was significantly different between Asian and Western visitors. 본 연구의 목적은 1) 한옥 게스트하우스를 찾는 외래관광객의 방문동기를 확인해내고, 2) 동양인과 서양인 방문객의 인구통계적 및 관광행동적 특성과 방문동기에 있어서 어떠한 차이가 있는지를 검정하며, 3) 동기와 만족도 및 행동의도와의 상호 영향관계를 규명하는데 있다. 이러한 목적을 달성하기 위하여, 설문조사는 한옥 게스트하우스 중 하나인 북촌 티게스트하우스를 방문한 외래관광객을 대상으로 온라인조사를 실시하였다. 요인분석결과 24개의 항목으로 구성된 한옥 방문동기는 ‘문화탐험성’, ‘일상탈출성’, ‘사교성’, ‘가족친화성’, ‘한옥체험성’, ‘신기성’의 6개 동기요인으로 도출되었다. 또한 한옥 방문동기와 문화권별 차이를 검정하기 위하여 t-test를 실시한 결과, ‘문화탐험성’, ‘가족친화성’, ‘한옥체험성’, ‘신기성’ 동기에 있어서 동양인과 서양인 방문객 간에 통계적으로 유의한 차이가 있는 것으로 나타났으며, 동양인에 비해 서양인의 방문동기가 더 높았다. 마지막으로, 한옥 방문동기와 만족도 및 행동의도 간의 영향관계를 분석한 결과, 동․서양 방문객간 공통적으로 ‘문화탐험성’, ‘신기성’, ‘한옥체험성’, ‘사교성’이 한옥 방문 만족도를 설명하는 중요한 요인으로 나타났다. 이중에서 ‘한옥체험성’이 동양인과 서양인 방문객 사이에서 유의한 차이가 있음을 Z-test를 통해 검정되었다.

저궤도 지구관측위성 발사체 분리 시 충격응답 해석

이대은,장해원,한재흥,우성현 한국항공우주학회 2010 한국항공우주학회 학술발표회 논문집 Vol.2010 No.4

통계적 에너지 해석 기법을 활용한 다목적 실용위성 5호의 음향-진동 연성 해석

이대은,장해원,한재흥,우성현,은희광 한국항공우주학회 2009 한국항공우주학회 학술발표회 논문집 Vol.2009 No.4

FE-BEM 및 SEA 해석 기법을 활용한 샌드위치 복합재 구조물의 전 주파수 대역 음향 해석

이대은,이윤규,김홍일,김재영,Lee, Dae-Oen,Lee, Yoon-Kyu,Kim, Hong-Il,Kim, Jae-Young 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.4

Increase in use of lightweight structures, coupled with the increased acoustic loads resulting from larger and longer range guided missiles, has made missile more susceptible to failures caused by acoustic loads. Thus, accurate prediction of acoustic environment and the response is becoming ever more important for mission success. In this paper, the acoustic response of a sandwich composite skin structure to diffuse acoustic excitation is predicted over a broad frequency range. For the low frequency acoustic analysis, coupled FE-BEM method is used where the structure is modeled using FEM and the interior and exterior fluid is modeled using BEM. For the high frequency region, statistical energy analysis is applied. The predicted acoustic level inside the structure is compared with the result from acoustic test conducted in reverberation chamber, which shows very good agreement.

노작교육이 초등학교 특수학급 정신지체 아동의행동 변화에 미치는 효과 분석

이대은,방기혁 한국실과교육학회 2002 한국실과교육학회지 Vol.15 No.1

이 연구는 초등학교에 재학중인 정신지체 아동을 위한 노작교육의 필요성에 따라 프로그램을 작성·운영함으로써 아동들의 행동에 어떠한 변화가 나타나는가를 관찰한 후 노작교육의 효과를 분석하는 것을 목적으로 수행하였다.이를 위하여 구체적인 연구 목표는 먼저, 정신지체 아동의 특성 및 학습 원리를 이해하고 그에 따른 노작교육의 필요성을 밝히며, 제 7차 실과 및 특수학교 교육과정에서 정신지체 아동에게 적합한 노작교육 활동을 분석·추출하여 정신지체 아동을 위한 노작교육활동 프로그램을 개발한 후 아동들에게 적용하는 가운데 행동 변화를 관찰하고 노작 교육의 효과를 분석하는 것으로 설정하였다.