산뽕잎 및 은행잎 차의 항산화 활성과 플라보노이드 함량

황인욱,김지은,정신교 경북대학교 농업과학기술연구소 2010 慶北大農學誌 Vol.28 No.-

산뽕잎, 은행잎 및 혼합차의 침출시간에 따른 항산화 활성을 DPPH 라디칼 소거 활성과 FRAP 방법으로 조사하였으며, 총 페놀 화합물의 함량은 Folin-Ciocalteu법, 플라보노이드 함량은 HPLC로 분석하였다. 침출시간에 따라서 DPPH 라디칼 소거활성과 FRAP 활성은 은행잎차, 혼합차, 산뽕잎차 순으로 높게 나타났다. 총 페놀 성분 함량은 은행잎차, 혼합차, 산뽕잎차 순으로 높았으며 산뽕잎에 은행잎을 2:1로 혼합하였을 때 항산화 활성이 증가하였다. 침출시간 3분 정도에서 산뽕잎차 및 혼합차는 비교적 항산화 활성이 높았으며 은행잎차는 6분 까지 활성이 증가하였다. HPLC로 분석한 플라보노이드 성분 함량은 quercetin이 모든 차에서 가장 함량이 높았으며, 은행잎차, 혼합차, 산뽕잎차 순으로 플라보노이드의 총 함량이 높게 나타났다. 제조한 침출차 들의 항산화 성분 함량과 항산화 활성의 상관계수는 0.87 이상으로 상관성이 상당히 높았다. The antioxidant activities and flavonoid contents of the mulberry leaves and the ginko leaves teas were investigated. The antioxidant activities were examined by FRAP and DPPH radical scavenging assays, and total phenolic content and the flavonoid contents by HPLC were also determined. The ginko leaves tea showed the highest antioxidant activities and antioxidant contents, while the wild mulberry leaves tea showed the lowest. The antioxidant activities of the mixture tea of wild mulberry leaves and ginko leaves were increased more than the wild mulberry leaves tea. The flavonoid contents of the leaves(ginko, wild mulberry and mixture) powders were higher than those of infusion teas. Compared with wild mulberry tea, the mixture tea showed a little increase of flavonoid contents. The total phenolic contents and the flavonoid contents of the teas showed good correlations with their antioxidant activities, such as FRAP and DPPH radical scavenging activities(). The antioxidant capacities of wild mulberry leaves tea could be enhanced by the addition of the ginko leaves.

중고령 은퇴가구의 소득구성과 의료비 지출의 관계 분석

황인욱,이태진 한국보건사회연구원 2018 保健社會硏究 Vol.38 No.2

Although the theory of Mental Accounting by Shefrin & Thaler (1988)’s work on the Behavioral Life Cycle Hypothesis provided a theoretical framework on the distinguishing effects of the source of income on household expenditure, studies using real world data are rare. This study aimed to estimate effects of the source of household income on health care expenditure of the retirees. Based on the Korean Retirement and Income Survey (KReIS) data in 2011 and 2013, households were classified into one of the four groups―Asset income, Public pension income, Private transfer income, or Social security dependent―based on the income composition using K-means cluster analysis. Next, the effect of the major source of income on health care utilization of the retirees was estimated using the Two-Part Model analysis, after controlling for the determinants of health care utilization suggested by the Andersen Model. The results that, compared to the asset income dependent households, the health care expenditure of the pension income dependent households was 18.2% lower. In addition, the odds of using health services and the health care expenditure of the social security income dependent were 0.044 times and 53.6% lower, respectively. This results suggest that the source of household income is an important determinant of health care utilization alongside the income level. Shefrin과 Thaler(1988)의 연구가 주창한 행동학적 생애주기 가설의 심리계정(mental accounting) 이론은 일찍이 유형별 소득원이 의료비 등 소비 비목에 서로 다른 영향을 미치는 점을 지적했으나 우리나라에서 가구 소득원과 의료비의 관계를 살펴본 연구는 매우 드물다. 본 연구는 은퇴 중고령 가구를 대상으로 가구의 주요소득원이 의료비지출에 미치는 영향을 살펴보았다. 국민노후보장패널조사(KReIS)의 2011, 2013년도 자료에서 K-평균 군집분석을 통해 대상 가구를 자산소득 의존형, 사적이전소득 의존형, 공적연금소득 의존형, 사회보장급여 의존형 등 네 집단으로 분류한 후, 투파트 모델(Two-Part Model)을 이용해 앤더슨 모형이 제시한 의료이용의 결정요인을 통제한 뒤 주요소득원이 은퇴 중고령 가구의 의료이용에 미치는 영향을 추정하였다. 그 결과, 자산소득 의존형 가구에 비해 공적연금소득 의존형 가구의 의료비가 18.2% 유의하게 감소했다. 또한, 사회보장급여 의존형 가구의 경우 의료이용을 경험할 odds 및 의료비가 각각 0.044배 및 53.6% 유의하게 감소했다. 사적이전소득 의존형 가구의 의료비는 유의한 차이를 보이지 않았다. 위 결과는 유형별 소득원이 가구 의료비에 서로 다른 영향을 미칠 수 있음을 실증적으로 보여준 것으로, 은퇴 중고령 가구의 경우 가구 소득뿐만 아니라 소득원 역시 의료비 지출에 중요한 영향을 미치는 점을 시사한다.

Inter-Generational Effects of Basic Pension on Adult Children’s Subjective Well-Being

황인욱,이태진 한국보건사회연구원 2023 保健社會硏究 Vol.43 No.1

This study aimed to estimate the inter-generational effect of Basic Pension on adult children’s overall life satisfaction using the propensity score matching (PSM) and generalized difference-in-differences (GDD) design with an event study framework and 2007~2019 Korean Welfare Panel Study data. The findings of this study showed that although overall life satisfaction of the adult children was relatively improved following their parents’ receipt of Basic Pension among those whose education level was university graduation or higher, the effect was not generally found in the sample. The absence of statistically significant improvement in overall life satisfaction among the adult children in the entire sample was presumably due to the low level of Basic Pension benefits and the absence of household income pooling and resource allocation to the adult children. Further investigation of the within-household distribution of Basic Pension income in Korea is needed to understand the true effect of the policy on households. This study is the first to provide empirical evidence on the inter-generational effect of Basic Pension policies in Korea on adult children’s well-being by benefit duration, using a quasi-experimental study design.

시간 상관 단일 광자 계수법

황인욱,안태규,고다미,김동호 한국광학회 2004 광학과 기술 Vol.8 No.4

국내산 단삼의 수확시기에 따른 지표 성분과 항산화능

황인욱,성기운,김보민,서영진,김미연,정신교 한국식품영양과학회 2015 한국식품영양과학회 학술대회발표집 Vol.2015 No.8

비접촉식 촉감 디스플레이 기술 동향

황인욱,김진용,윤성률 한국전자통신연구원 2018 전자통신동향분석 Vol.33 No.5

With the widespread use of multifunctional devices, haptic sensation is a promising type of sensory channel because it can be applied as an additional channel for transferring information for traditional audiovisual user interfaces. Many researchers have shed new light on non-contact haptic displays for their potential use on ambient and natural user interfaces. This paper introduces several of the latest schemes for creating a mid-air haptic sensation based on their transfer medium: ultrasonic phased arrays, air nozzles, thermal and plasmonic lasers, and electromagnets. We describe the principles used in delivering haptic sensation in each technology, as well as state-of-the-art technologies from leading research groups, and brief forecasts for further research directions.

Optimization of Enzymatic Hydrolysis of Persimmon Peels for Vinegar Fermentation

황인욱,정신교,정문철,정호철,정헌식 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.4

Response surface methodology (RSM) was used to determine the treatment conditions of optimal enzymatic hydrolysis for vinegar preparation from persimmon peel. Persimmon peel was hydrolyzed with different concentrations of Viscozyme L (0–4%) at different temperatures (40–60oC) for different lengths of time (2–10 h) followed by vinegar fermentation. Reducing sugar and soluble solids of the hydrolyzed juice were significantly affected by the hydrolysis conditions. Optimal condition was obtained with the enzyme concentration of 2.38 g/100 mL,reaction temperature of 49.19oC, and reaction time of 6.32 h. The titratable acidity of vinegar prepared from the juice hydrolyzed under the optimized condition increased by 276% (4.25 g/100 g). Acetic acid, citric acid, oxalic acid, and succinic acid were identified in the vinegar. Results suggest that the enzymatic hydrolysis pretreatment could be used for increasing the yield of the vinegar fermentation.

Ultra fast dynamics of photo-generated mobile carriers polymer

황인욱,이창렬 한국고분자학회 2010 한국고분자학회 학술대회 연구논문 초록집 Vol.2010 No.4

한국인 집단 내에서 5 개 Alu 삽입/결실 다형 분석

황인욱,신예은,이지연,홍준호,진한준 한국법과학회 2015 한국법과학회지 Vol.16 No.1

Improvement in b-glucan extraction from Ganoderma lucidum with high-pressure steaming and enzymatic pre-treatment

황인욱,김보민,김영찬,이상한,정신교 한국응용생명화학회 2018 Applied Biological Chemistry (Appl Biol Chem) Vol.61 No.2

In this study, the high-pressure steaming and enzymatic pre-treatment (SET) was used to improve bglucan extraction from Ganoderma lucidum (G. lucidum), an oriental medicinal mushroom. Response surface methodology and central composite design were used to determine the optimum pre-treatment conditions: highpressure steaming, enzymatic hydrolysis, and Viscozyme L concentrations. The optimal conditions were 15.51 min for high-pressure steaming, 0.84 g/100 mL of Viscozyme L, and 4.16 h for hydrolysis. The predicted b-glucan content in G. lucidum extract at optimal conditions, approximately twofold (8.05 g/100 g) of the control treatment value, was consistent with the empirical value. The total sugar and protein contents through SET were higher than those values of the control treatment. The cell migration assay showed that SET-processed G. lucidum extracts significantly suppressed B16F10 murine melanoma cell growth. SET process using Viscozyme L could be utilized for bglucan extraction from G. lucidum to develop the functional food.