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3 자유도 비행체 시스템의 이벤트 트리거 기반의 H<sub>2</sub> 자세 제어기 설계
정혜인,한승용,이상문,Jung, Hyein,Han, Seungyong,Lee, Sangmoon 대한임베디드공학회 2020 대한임베디드공학회논문지 Vol.15 No.3
This paper is concerned with the H<sub>2</sub> attitude controller design for 3 degree of freedom (DOF) Hover systems with an event-triggered mechanism. The 3 DOF Hover system is an embedded platform for unmanned aerial vehicle (UAV) provided by Quanser. The mathematical model of this system is obtained by a linearization around operating points and it is represented as a linear parameter-varying (LPV) model. To save communication network resources, the event-triggered mechanism (ETM) is considered and the performance of the system is guaranteed by the H<sub>2</sub> controller. The stabilization condition is obtained by using Lyapunov-Krasovskii functionals (LKFs) and some useful lemmas. The effectiveness of the proposed method is shown by simulation and experimental results.
광경화성 알파-메톡시아크릴레이트 단량체의 경화특성에 관한 연구
정혜인(Hyein Jung),서해민(Haemin Seo),연애진(Aejin Yeon),이미혜(Mi Hye Yi),김은경(Eunkyoung Kim),가재원(Jae-Won Ka) 한국고분자학회 2018 폴리머 Vol.42 No.3
광가교형 시스템에 많이 사용되는 아크릴레이트 또는 메타아크릴레이트(MA)는 일반적인 광조사 파장인 365 nm 자외선 영역에서의 낮은 광반응성으로 인해 광개시제 혹은 높은 에너지 조사가 필요하였다. 아크릴레이트의 365 nm에서의 반응성을 증가시키기 위해 분자설계를 통한 이중결합의 HOMO 에너지가 조절된 알파-메톡시아크릴레이트(aMA)를 합성하였다. 새로이 합성한 aMA의 광반응성을 조사하기 위해 일정량의 UV 조사후 FTIR 스펙트럼 변화를 관찰하였으며, 알킬기로만 이루어진 1,6-헥산다이올(Hx)을 이용하여 에스테르화 반응을 통해 화합물 HxaMA와 비교군으로서 Hx-MA를 합성하였다. 합성한 화합물에 0에서 50 J/cmc² 365 nm 자외선을 조사한 후 FTIR 스펙트럼의 변화로부터 전환율을 계산하였고, 이로부터 aMA 가교기의 광반응성이 MA에 비해 약 3배 높음을 확인하였다. 높은 광반응성의 aMA RM(reactive mesogen)은 광개시제 사용이 제한되는 바이오 응용, 디스플레이 또는 광학부품용 소재로 응용이 가능하다. The acrylate or methacrylate (MA) group which is often used in photo-crosslinking systems requires high energy or photoinitiator because of its low photoreactivity under 365 nm. In order to increase the photoreactivity of acrylate group at 365 nm, we designed and synthesized the α-methoxyacrylate (aMA) with controlled HOMO energy level of double bond. The compounds (Hx-aMA and Hx-MA) were synthesized from 1,6-hexandiol (Hx) via esterification reaction. The degree of conversion of the synthesized compounds were calculate from the FTIR spectral change after UV irradiation of 0 to 50 J/cm² at 365 nm. The photoreactivity of aMA crosslinker was about 3 times higher than that of MA. A high photoreactive aMA RM (reactive mesogen) can be utilize to bio-applications, display or optical component applications where the use of photoinitiators are limited.
2020 한국인 영양소 섭취기준 활용 자료를 이용한 영양교육 프로그램의 적용 및 효과: 경상남도 및 경기도 지역 대학생을 대상으로
최미주(Mijoo Choi),정혜인(Hyein Jung),김나영(Nayoung Kim),신상아(Sangah Shin),우태정(Taejung Woo),박은주(Eunju Park) 한국영양학회 2023 Journal of Nutrition and Health Vol.56 No.6
Purpose: The 2020 Dietary Reference Intakes for Koreans (KDRIs) serves as a foundation for daily nutrient and energy recommendations aiming to enhance public health and prevent chronic diseases. They act as guidelines for maintaining proper nutrition and overall health. Using KDRIs is crucial for promoting healthier lifestyles and making informed dietary choices. Thus, this study explores the influence of a nutrition education program, based on the 2020 KDRIs, on the nutrition knowledge and dietary habits of undergraduates in Gyeongsangnam-do and Gyeonggi-do. Methods: The nutrition education program, designed with diverse instructional materials, was executed across a wide range of universities. The education group (n = 75) engaged in the program for a 6-week instructional period, while the control group (n = 53) underwent the survey without participating in the education program. Nutrition Quotient (NQ) and knowledge assessments were administered to both groups immediately before and after the instructional period. Results: Within the education group, the nutrition education program positively impacted responses to NQ practice items, including knowledge of nutrition, daily intake, and portion sizes (p < 0.05). In contrast, there were no significant differences between the before and after responses of the control group for most survey items. Post-program evaluations showed significantly higher self-assessment scores and increased satisfaction levels (p < 0.05), with the satisfaction rate for the education program using the 2020 KDRIs reaching 99.2%. Conclusion: This study has demonstrated the positive impact of an effective nutrition education program. However, there is a need for the continuous development and implementation of nutrition education programs to sustain these outcomes and further enhance the nutritional education experience.