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행복 변동성의 차이에 관한 연구: 대학생 종단 자료를 이용한 잠재계층성장 모형 접근
권유리,최인철,최종안 한국사회및성격심리학회 2019 한국심리학회지 사회 및 성격 Vol.33 No.3
The current research aimed to explore whether and how happiness varied. While previous studies mainly focused on either the stability of happiness or the variability of happiness, we took into account the possibility that there might be differences in the patterns of variability in happiness and investigated whether happiness varied in different patterns among different people. To this end, we conducted a series of latent class growth modeling analyses with longitudinal data collected from undergraduates for three years (N = 219). The results showed that there were three different subgroups in terms of patterns of happiness change: increasing vs. stable vs. decreasing. Subsequently, the results of logistic regression analyses indicated that a few demographic variables (i.e., age and major) and Big Five traits (i.e., extroversion, emotional stability, and conscientiousness) could predict the patterns of happiness change. We discussed the implications and limitations of the current research. 본 연구는 행복의 변동 여부와 변동 양상의 차이를 알아보기 위해 실시하였다. 기존의 연구들이 행복의 평균적 변화에만 주목하여 행복을 고정된 특질 혹은 유동적 상태로 이분하여 보았던 것과 달리, 본 연구는 행복 변동 양상에서의 개인차 가능성을 고려하여, 행복의 변동이 개인에 따라 상이한 형태로 나타나는지 조사하였다. 이를 위해 3년에 걸쳐 수집된 대학생 종단 자료(N = 219)를 활용하여 행복 변화에 대한 잠재계층성장모형 분석을 실시하였다. 분석 결과, 행복 변화 유형에 따라 하위-증가형, 유지형, 그리고 감소형의 세 하위 집단이 확인되었다. 추가 로지스틱 분석 결과, 일부 인구 통계학 변인과 성격 특질 변인들이 행복 변화 유형을 예측하는 것으로 나타났다. 본 연구 결과들의 시사점 및 한계점에 대해 논하였다.
추출용매에 따른 모링가(Moringa oleifera Lam.) 잎의 항산화 및 생리활성 효과
권유리,윤광섭 한국식품저장유통학회 2014 한국식품저장유통학회지 Vol.21 No.6
This study was conducted to investigate the antioxidant activity and physiological properties of Moringa (Moringa oleifera Lam.) leaves extracted with three different solvents (water, ethanol, and methanol). The extraction yield from water, methanol, and ethanol were 13.17, 9.54, and 7.48%, respectively. The highest total polyphenol content (58.04 mg/100 g) and total flavonoid contents (12.36 mg/100 g) were observed in water extract. The DPPH radical scavenging activity was the highest in the water extract (79.18%) at the 500 mg% level, similar to BHT (77.18%). Additionally the same tendency was observed with DPPH, ABTS radical scavenging ability, and ferreous ion chelating ability. The water extract showed relatively high antioxidant activities. The angiotensin Ⅰ-converting enzyme (ACE) and the HMG-CoA reductase inhibitory activity of water extract at a concentration of 500 mg% were somewhat higher than those of the other extracts. Additionally, the HMG-CoA reductase inhibitory activity of the water extract was significantly slightly lower than that of the positive control (cholorogenic acid). These results suggest that Moringa leaves extracted with water will be useful as antioxidant-rich and functional natural foods.
다양한 보행속도와 경사각에 대한 보행수 검출을 위한 필터링 조건과 역치의 결정
권유리,김지원,이재호,탁계래,엄광문,Kwon, Yu-Ri,Kim, Ji-Won,Lee, Jae-Ho,Tack, Gye-Rae,Eom, Gwang-Moon 대한의용생체공학회 2009 의공학회지 Vol.30 No.6
The purpose of this study is to determine optimal filtering condition and threshold for the detection of gait-cycles for various walkway slopes as well as gait velocities. Ten young healthy subjects with accelerometer system on thigh and ankle walked on a treadmill at 9 conditions (three speeds and three slopes) for 5 minutes. Two direction signals, i.e. anterior-posterior (AP) and superior-inferior (SI) directions, of each sensor (four sensor orientations) were used to detect specific events of gait cycle. Variation of the threshold (from -1G to 1G) and lowpass cutoff frequency (fc) were applied to the event detection and their performance was evaluated according to the error index (EI), which was defined as the combination of the accuracy and false positive rate. Optimal fc and threshold were determined for each slope in terms of the EI. The optimal fc, threshold and their corresponding EI depended much on the walkway slope so that their coefficients of variation (CV) ranged 19~120%. When all data for 3 slopes were used in the identification of optimal conditions for each sensor, the best error indices for all sensor orientations were comparable ranging 1.43~1.76%, but the optimal fc and threshold depended much on the sensor position. The result indicates that the gait-cycle detection robust to walkway slope is possible by threshold method with well-defined filtering condition and threshold.
권유리,윤광섭 한국식품저장유통학회 2014 한국식품저장유통학회지 Vol.21 No.5
To evaluate the processing adaptability of burdock (Arctium lappa L) tea, the physicochemical properties of burdock tea treated with steaming and roasting were investigated. The tea treatments included hot-air drying after roasting (HDR, drying at 60°C for 6 hr), steaming after hot-air drying (SHD, steaming at 100°C for 10 min), and steaming and then hot-air drying followed by roasting (SHDR, roasting at 250°C for 3 min). The physicochemical properties, antioxidant activities, and sensory properties of the HDR, SHD, and SHDR teas were measured in hot water, and the tea was extracted from each sample. The color values of lightness (L) and yellowness (b) were lower in the HDR and SHDR teas, and the total sugar content of the SHDR tea was significantly higher than that of the other teas. The ABTS and DPPH radical scavenging abilities of the SHDR tea with a 500 mg% concentration were significantly higher than those of the SHD tea. In the sensory evaluation, the SHDR tea was ranked significantly higher than the other samples as to its color, flavor, taste, and overall acceptability. The results suggest that SHDR can be applied to burdock tea to achieve high quality and functionality.
권유리,윤광섭,Kwon, Yu-ri,Youn, Kwang-Sup 한국식품저장유통학회 2017 한국식품저장유통학회지 Vol.24 No.5
톳의 산업적 활용도 증진을 위하여 다양한 추출방법(열수, 고온가압, 초고압)을 이용하여 항산화 및 생리활성 특성을 평가하였다. 총 폴리페놀 및 플라보노이드 함량의 경우 전체적으로 가압가열 추출물에서 각각 30.51 mg/g, 4.78 mg/g으로 높은 함량을 나타내었다. 추출방법에 따른 톳 추출물의 항산화 활성을 평가하고자 DPPH와 ABTS 라디칼 소거활성 및 환원력을 실시하였으며 그 결과, 모든 실험구에서 농도 의존적으로 증가하는 경향을 보였으며 특히 고온가압 추출물이 전체적으로 높은 활성을 보였다. 그러나 지방산패 및 XO 억제활성의 경우 초고압 처리한 톳 추출물이 1 mg/mL의 농도에서 각각 61.93%, 33.68%로 가장 높은 활성을 나타내었다. 또한 tyrosinase 및 elastase 저해활성은 1 mg/mL의 농도에서 초고압 추출물이 각각 40.51%, 73.79%로 가장 높은 활성을 보였으며 고온가압, 열수의 순으로 나타났다. 톳의 경우 온도와 압력을 가했을 때 유용물질의 용출이 용이해져 다양한 항산화 및 생리활성을 나타내는 것을 알 수 있었으며 고온가압 및 초고압 추출물은 소재 활용가치가 높은 것으로 사료되며 기능성 증진을 위한 천연 식품소재로 활용 가능할 것으로 판단된다. The physiological properties of extracts from Hizikia fusiforme with different extraction methods (hot water extraction, autoclave extraction and high pressure extraction) were investigated. The amounts of substances related to polyphenol and flavonoids contents were the highest in autoclave extract (30.51 mg/g and 4.78 mg/g, respectively). The DPPH radical scavenging activity was the highest in the autoclave extract (81.80%) at the 5 mg/mL. Autoclave extract exhibited the strongest ABTS radical scavenging activity and reducing power among the three extraction methods. However, ferrous ion chelating, TBA reactive substances and xanthine oxidase inhibition activity of high pressure extract were higher than those of the other extracts. Additionally, the tyrosinase and elastase inhibition activities of high pressure extract with a concentration of 1 mg/mL were higher than those of the other extracts. These results suggest that extracts of Hizikia fusiforme have a potential to act as functional materials, and autoclave and high pressure extractions are superior to hot water extraction for enhancement of the biological activity.