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Association of Coffee or Green Tea with Ferritin or Hemoglobin in Premenopausal Women
Dagyeong Lee,Wonyoung Jung,Dong Wook Shin 대한가정의학회 2023 Korean Journal of Family Medicine Vol.44 No.2
Background: This study aimed to examine the association between coffee or green tea consumption and ferritin or hemoglobin levels in premenopausal women.Methods: We used the fifth Korea National Health and Nutrition Examination Survey (2010–2012), and a total of 4,322 individuals were surveyed. In women of reproductive age, average ferritin and hemoglobin levels were calcu-lated according to coffee or green tea consumption. Covariates included in the analysis were demographic vari-ables, such as age, body mass index, education, drinking, smoking, history of hypertension, history of diabetes di-agnosis, physical activity, total energy intake, and daily iron intake.Results: In 4,322 participants, the average hemoglobin level was 12.90±0.02 g/dL, and the average level of ferritin was 31.95±0.67 ng/mL. As a result of testing, correlation between ferritin and coffee intake and difference in ferritin levels according to coffee consumption was significant (P<0.05). In this study, a post hoc test indicated that ferritin level significantly differed between one and two cups, two and three cups, and three and one cup groups (overall P<0.001). Additionally, there was a negative correlation between ferritin level and coffee intake; ferritin level de-creased by 2.09 ng/mL with a one-cup increase in daily coffee consumption.Conclusion: In premenopausal women, coffee intake is associated with low serum ferritin levels. Our results indi-cate that drinking >2 cups of coffee significantly affect ferritin levels in Korean premenopausal women.
Effect of MgO-CaO-Al2O3-SiO2 glass additive on densification of Al2O3 ceramics
Dagyeong Lee,Hyun Seon Hong,Hyeondeok Jeong,Sung-Soo Ryu 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.2
We investigated the effect of the MgO-CaO-Al2O3-SiO2 (MCAS) additive on the densification of Al2O3 ceramics. MCAS wassynthesized using a polymeric-complex method. We analyzed the densification behavior, using dilatometric analysis up to1600 oC, and the results showed that sinterability increased with increasing MCAS content. Al2O3 samples were prepared byisothermal sintering at 1400, 1500, and 1600 oC. The microstructure, phase formation, and hardness of the samples wereanalyzed and discussed in relation to both the MCAS content and sintering temperature. The density of the MCAS-dopedsamples sintered at 1500 and 1600 oC was over 98%, and the maximum relative density was 99.7%. The highest hardness (18GPa) was achieved for the sample prepared with 3 wt.% MCAS and sintered at 1500 oC for 1 h because further dopingresulted in excessive grain growth. These results elucidate the conditions required for pressure-free sintering.
과열증기 조리에 따른 버섯의 기능성 성분 함량 및 잔존율에 미치는 영향
김다경(Dagyeong Kim),김민주(Minju Kim),강민정(Min-Jung Kang),김영화(Younghwa Kim) 한국식품영양과학회 2021 한국식품영양과학회지 Vol.50 No.8
본 연구에서는 국내 다소비 버섯 6종(양송이버섯, 팽이버섯, 만가닥버섯, 표고버섯, 새송이버섯, 느타리버섯)의 일반찜 및 과열증기 조리에 따른 수분함량, 수용성 비타민, 기능성 성분의 함량 변화를 알아보고 이에 대한 영양소 잔존율을 비교하였다. 버섯의 조리수율은 중량이 감소함에 따라 조리된 모든 버섯에서 감소를 나타내었다. 버섯 6종의 수용성비타민(비타민 B₁, 비타민 B₂, 비타민 B₃, 비타민 C)의 잔존율은 대부분 일반찜보다 과열증기 조리에서 높은 수준을 나타냈다. 과열증기 조리를 실시한 대부분의 버섯은 일반찜에 비해 유의적으로 높은 총 폴리페놀 및 플라보노이드 잔존율을 나타내었고, ABTS 및 DPPH 라디칼 소거능도 과열증기 조리 시 일반찜에 비해 높게 나타났다. 본 연구를 통해 일반찜과 과열증기 조리에 의한 국내 다소비 버섯 6종에 대한 수용성 비타민 및 기능성 성분 함량과 잔존율에 대한 변화를 알 수 있었으며, 과열증기 조리에 의한 식품 중 영양성분 및 기능성 성분의 잔존율에 대한 긍정적인 효과를 알 수 있었다. This study sought to investigate the effect of superheated steam on the contents and the true retention of bioactive compounds in mushrooms. The results showed that the true retention of water-soluble vitamins B1 (thiamin), B2 (riboflavin), B3 (niacin), and C (ascorbic acid) were higher in mushrooms after superheated steaming as compared to the conventional steaming method. The content of total polyphenols and flavonoids in the cooked mushrooms except for Hypsizygus tessellatus increased with both superheated steaming and conventional steaming methods as compared to uncooked mushrooms. Also, the true retention of total polyphenols and flavonoids in superheated steamed mushrooms was higher than the conventional method. In general, the contents and the true retention of ergothioneine and glucan were higher in mushrooms with superheated steaming compared to the conventional steaming method. The free radical scavenging activity of the superheated steamed samples except for Pleurotus eryngii increased compared to that of the conventional steamed samples. These results suggest that superheated steaming causes positive changes in the nutritional and functional components of mushrooms compared to conventional steaming.
Choi, Dagyeong,Ahn, Soonjae,Ryu, Jeseong,Nagao, Mitsuo,Kim, Youngho MYU K.K. 2018 Sensors and materials Vol.30 No.8
<P>Osteoarthritis (OA) is one of the most common causes of disability in elderly individuals. Although X-rays, MRIs, and arthroscopy are widely used to examine OA, they do not provide dynamic information on activity-based joint integrity. In this study, acoustic emission (AE) in healthy individuals and OA patients was determined using piezoelectric sensors. Twenty normal subjects and fourteen OA patients were asked to perform weight-bearing (stand-to-sit) and non-weight-bearing (extension to flexion) exercises for 4 s each. Sensors were attached to the medial and lateral epicondyles of the tibia and the front of the patella. An AE event was defined as the threshold crossing based on AE signals. The results indicated that OA and healthy groups exhibited signals at a frequency range corresponding to approximately 100 Hz-10 kHz and less than 1 kHz, respectively. The OA group exhibited an amplitude of AE signals and a number of AE events that exceeded those of the healthy group (p < 0.05). AE signals from lesions exhibited a higher dB value and a larger number of AE events than those at other locations. However, most patients exhibited significant increases in AE signal characteristics at the front of the patella. The results of this study can be helpful in the early diagnosis or easy monitoring of knee OA in daily lives.</P>
유리드믹스 교수법에 의거한 시니어 대상의 우쿨렐레 연주 지도법
이다경 ( Lee Dagyeong ) 한국달크로즈유리드믹스학회 2017 국내학술심포지엄 Vol.2017 No.-
본 연구는 빠르게 노령사회로 진입하고 있는 한국의 시니어들에게 음악교육을 통하여 정서적인 안정과 삶의 활력을 주고, 자아실현을 통해 보다 나은 시니어들의 생활을 영위하는데 큰 도움을 주고자 한다. 그 중 기악수업에서 다양화 되고 있는 악기들 중, 다양한 연령층이 배우기 용이하며 여러 가지 장점을 가지고 있는 우쿨렐레를 선택하여, 처음 접하는 시니어 학습자들에게 우쿨렐레 악기를 체계적이고, 올바른 연주 지도방안을 모색하고자 달크로즈 유리드믹스 교수법을 적용해서 지도 할 수 있게 하는 데 목적이 있다. 유리드믹스 교수법에 의거한 시니어 대상의 우쿨렐레 연주 지도법의 연주 지도안에 대한 이론적 배경으로는 시니어 교육에 대한 연구와 시니어 교육의 필요성과 유의점을 살펴본 후, 시니어 교육에서의 음악의 역할, 시니어를 위한 우쿨렐레 악기의 역사, 악기의 구조와 명칭 그리고 우쿨렐레의 음악적 교육의 의미와 필요성을 구체적으로 살펴보았다. 또한 우쿨렐레의 지도 연주곡 현황을 유아·어린이, 중·고등학생, 성인, 시니어로 나누어 조사하였으며, 그 중 시니어를 위한 우쿨렐레 연주 지도법을 제시하였다. 달크로즈 유리드믹스 교수법에 의거한 시니어 대상의 우쿨렐레 지도 연주법을 처음 접하는 시니어들에게 우쿨렐레의 특성과 구조를 알게 하고 정확한 주법의 연주능력을 기르게 하며, 연주를 통해 음악의 흥미를 느끼고 리듬감 음악성 등의 능력을 향상 시키고자 한다. 또한 합주나 앙상블을 통하여 타인의 소리를 듣고 협동심, 사회성을 향상시키고자 한다. 출판사 교재들 중 많이 연주되는 곡 들을 선정하여 코드를 중심으로 리듬 수업을 진행하고 노래 부르기에서 달크로즈 유리드믹스에 나오는 리듬을 적용한 게임을 통하여 지도 할 수 있게 제시 하였다. 또한 클래식 감상&예술을 통하여 명화와 미술작업을 등, 다양한 방법으로 우쿨렐레 연주 지도법으로 접근하였다. 이 학습을 통해 기대되는 효과는 다음과 같다. 첫째, 처음 접하는 초급 단계에 따라 우쿨렐레 지도 연주곡을 선택하여 지도방법과 수업지도안을 제시하였고, 달크로즈 유리드믹스 교수법에 의거한 리듬 지도법에 맞춰 노래하기, 신체 표현하기, 음악놀이 등으로 자신이 즐겁고 자발적으로 활동과 함께 수업 진행함으로써 즐겁게 악기를 배울 수 있다. 둘째, 우쿨렐레는 크기가 작고 다른 악기에 비해 배우기가 쉬워 누구나 거부감 없이 음악을 보다 가깝게 느낄 수 있으며, 연주 활동을 통해 학습하는 과정에서 음악적 감각이 향상되어 음악에 대한 관심과 흥미도가 높아지고, 다양한 음악적 경험을 하게 된다. 셋째, 우쿨렐레는 독주와 앙상블, 그리고 합주가 가능한 악기 이다. 달크로즈 유리드믹스의 목표에 접목시켜 집중력과 음악적 감각을 향상 시킬 수 있고 서로 협동하는 음악활동을 통하여 양보심과 협동심 타인과 조화를 이루는 사회성에 대한 긍정적인 경험을 하게 된다. 본 연구에서 제시한 유리드믹스 교수법에 의거한 시니어 대상의 우쿨렐레 연주 지도법은 시니어들이 우쿨렐레를 통하여 음악을 보다 쉽게 이해하고 표현하며, 음악적 능력을 발전시켜 음악적 감각이 향상 될 수 있는 방안을 제시하는데 주력하였다. 시니어들이 우쿨렐레에 많은 흥미와 관심을 가지는 것은 물론이거니와 다양하고 의미 있는 음악 경험을 할 수 있는 발판이 되기를 바란다. The purpose of this study is to provide emotionally stable and revitalized life through the music education to seniors who are rapidly entering the aging society and to help the seniors to live better life through self - realization. among them. This study aimed to select an ukulele which is easy to be learned by various age groups and has various advantages, among instruments diversified in instrumental classes, and teach new senior learners by applying the Dalcroze-Eurhythmics Teaching Method in order to find a systematic and correct playing instruction method of the ukulele instrument. As a theoretical background for a playing instruction plan of the ukulele's playing instruction method for the seniors according to the Eurhythmics Teaching Method, a research on the senior education, and the necessity and the importance of the senior education were examined. Then, roles of the music in the senior education, a history of the ukulele instrument for the seniors, structures and names of the musical instrument, and the meaning and the necessity of the ukulele's musical education were examined in detail. In addition, status of the ukulele's instruction playing songs was surveyed by dividing the subjects into infants, children, middle and high school students, adults and seniors, and methods of ukulele instruction playing for seniors out of them, were suggested. Therefore, this study aims to let the seniors identify the structures and the characteristics of the ukulele, let them develop the ability to play the accurate playing styles, let them feel the interest on the music through playing and improve the ability such as rhythmic sense and musicality. Furthermore, this study aims to improve team work and sociality by listening to the sounds of others through concerted music or ensemble. In this study, rhythm lessons were performed focused on chords by selecting a lot of songs frequently played from the publishing materials, and they were suggested in order to teach through games applying the rhythms presented in the Dalcroze-Eurhythmics Method in the singing songs. In addition, ukulele's various playing instruction methods such as masterpieces and artworks through classical appreciation & art also were used for the approach. The expected effects from this are as follows. First, this study suggests the instruction methods and the lesson instruction plans by selecting the ukulele's instruction playing songs according to the beginner's level, and enable people to learn musical instruments happily by conducting class with activities such as singing songs, body expression and music play according to the rhythmic instruction method based on Dalcroze-Eurhythmics Teaching Method. Second, the ukulele is small in size and easy to learn compared to other musical instruments, so that everyone can feel closer to the music without repulsion, and in the process of learning through playing activities, the musical sense is improved and interest in music is enhanced so that various musical experiences can be obtained. Third, the ukulele is a musical instrument capable of solo, ensemble and concerted music. It can enhance the concentration and the musical sense by combining with the goal of the Dalcroze-Eurhythmics, and through the musical activities of mutual cooperation, it gives a positive experience for the sociability for harmonizing with other people. The ukulele's playing instruction method based on the Eurhythmics Teaching Method proposed in this study, focuses on suggesting a method for seniors to understand and express music easily through the ukulele and to improve musical sense by developing musical ability. This study intends to enable seniors to have a lot of interest in the ukulele and be a stepping stone for various and meaningful music experiences.
에탄올로 유도된 간세포 손상에 대한 조리방법에 따른 자색고구마의 보호 효과
김윤정(Yoonjeong Kim),김다경(Dagyeong Kim),김나은(Naeun Kim),김영화(Younghwa Kim) 한국식품영양과학회 2023 한국식품영양과학회지 Vol.52 No.12
본 연구에서는 에탄올로 유도된 간 손상에 대한 자색고구마의 조리방법에 따른 간세포 보호 효과를 연구하였다. 자색고구마는 찌기, 굽기, 전자레인지의 세 가지 방법으로 조리되었고 생것과 함께 연구에 사용되었다. 자색고구마의 조리방법에 따른 수용성 비타민 B군의 함량을 분석한 결과, 대체로 증가하는 경향을 보였고, 특히 비타민 B7은 굽기와 전자레인지 조리 후 유의적으로 증가하였다. 조리방법에 따른 자색고구마 추출물은 모두 간세포에서 독성을 나타내지 않았으며, 에탄올 자극에 대해 고구마 추출물은 간세포의 생존율을 증가시켰다. 특히, 생것과 찐 자색고구마 추출물은 유의적으로 높은 간세포 보호 효과를 나타내었다. 그뿐만 아니라, 에탄올 단독 처리구에 비해 모든 자색고구마 추출물은 ROS의 생성을 억제하였으며, 특히 생것과 찐 자색고구마 추출물이 굽거나 전자레인지로 조리한 자색고구마에 비해 ROS 생성을 유의적으로 억제하였다. 간세포의 손상 지표로 알려진 ALT 및 AST의 활성과 MDA 함량을 확인하였을 때 에탄올 처리는 이들 지표를 모두 증가시켰으나 자색고구마 추출물과 함께 처리 시 유의적으로 감소시켰다. 특히 생것과 찐 자색고구마는 ALT 및 AST 활성과 MDA의 함량을 크게 감소시켰다. 또한 체내 항산화 방어 시스템에 작용하는 효소인 GST의 활성은 에탄올에 의해 감소하였으나, 생것과 찐 자색고구마 추출물에 의해 대조군과 유사한 활성을 나타내었다. 따라서 본 연구를 통해 에탄올로 유도된 간세포 손상에 대해 자색고구마는 긍정적인 효과가 있음을 확인하였으며, 자색고구마는 기능성 식품 소재로 활용될 수 있을 것으로 기대된다. Present study aimed to investigate the effects of three methods, namely, steaming, roasting, and microwaving, of cooking purple sweet potatoes (Ipomoea batatas L.) on hepatoprotective effects against ethanol-induced oxidative stress in HepG2 cells. Vitamin B1 and B7 contents were altered more after steaming than microwaving. The methanolic extracts of raw and cooked purple sweet potato had no cytotoxic effects on HepG2 cells, and raw and steamed potatoes had the greatest cytoprotective effects against ethanol damage. All samples significantly inhibited the generation of reactive oxygen species against ethanol-induced stress after 60 min compared to ethanol-treated controls. Ethanol treatment increased the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), and malondialdehyde (MDA). However, pretreatment with raw and/or steamed purple sweet potatoes significantly inhibited ALT, AST, and MDA levels. Moreover, pretreatment with raw or steamed purple sweet potato significantly increased glutathione S-transferase levels compared to ethanol treatment alone. Overall, these results suggest that purple sweet potatoes have potential use as a functional food ingredient to ameliorate ethanol-induced liver damage.
Ahn, Soonjae,Choi, Dagyeong,Kim, Jongman,Kim, Seongjung,Jeong, Youngjae,Jo, Min,Kim, Youngho MYU K.K. 2018 Sensors and materials Vol.30 No.8
<P>In this study, a pre-impact fall detection algorithm using a custom-made inertial sensor was optimized, and a spring-trigger airbag system was developed for preventing injuries from falls. Four different types of simulated falls were performed by 20 healthy volunteers (age 23.4 +/- 4.4 years), and six different daily activities were tested in 14 elderly subjects (age 71.8 +/- 4.0 years). An inertial sensor unit was used to measure acceleration, angular velocity, and vertical angle during all activities. Thresholds of 0.9 g acceleration, 47.3 degrees/s angular velocity, and 24.7 degrees vertical angle were determined on the basis of optimizing lead time and accuracy in pre-impact fall detection. A belt-type airbag system consisted of a polyurethane inner skin, an artificial leather outer shell, and a spring-trigger inflator. To evaluate the accuracy of the airbag system, 10 healthy adult males (age 28.5 +/- 2.7 years) wore the system and performed three sets of simulated falls. Fall detection was achieved 401.9 +/- 46.9 ms before impact on average, and the airbag inflated without fail during the falls (100% sensitivity). In all daily activities, no airbag inflation occurred (100% specificity).</P>