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수확 후 LED와 UV-B 조사에 의한 아스파라거스 순의 항산화 기능 향상
유남희(Nam-Hee Yoo),정선균(Sun-Kyun Jung),이정애(Chong Ae Lee),최동근(Dong-Geun Choi),윤성중(Song Joong Yun) 한국원예학회 2017 원예과학기술지 Vol.35 No.2
아스파라거스의 기능성을 향상시키기 위하여 처리 전 그리고 12시간 암상태로 저장한 아스파라거스를 대조구로 하여 백색(색온도 45,000 k), 청색(peak 450 nm), 적색(peak 660 nm)의 발광다이오드(light-emitting diode, LED)를 이용하여 수확한 아스파라거스 순을 광합성유효광양자속밀도(photosynthetic photon flux density, PPFD) 200 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP>의 광으로 12시간 처리하고, UV-B(280 nm)를 0.5kJ 또는 1.0kJ로 처리하여 원예적 특성, 비타민C(total ascorbic acid), 루틴(rutin), 총 페놀(total phenolics) 및 총 플라보노이드(total flavonoids) 함량과 자유기 소거능에 미치는 영향을 조사하였다. 이들 처리는 아스파라거스 순의 생체중, 길이, 직경 등에 변화를 초래하지 않았으며, UV-B 0.5kJ에서는 당도와 엽록소 함량이 각각 9%와 41% 증가하였다. 비타민 C, 루틴, 총 페놀 및 총 플라보노이드 등 항산화 성분 중에서 비타민 C 함량은 대조에 비하여 백색광(114%), 적색광 (137%) 및 UV-0.5 kJ(127%) 처리에서 크게 증가하였다. 반면 루틴, 총 페놀 및 총 플라보노이드 함량은 적색광이나 UV-0.5 kJ 처리에서만 대조구에 비하여 증가하였다. 또한 DPPH라디컬 소거능으로 측정한 항산화 활성은 대조구에 비하여 백색광, 적색광 및 UV-0.5 kJ 처리구에서 각각 43, 41 및 43% 증가하였다. 이상의 결과는 적색광 12시간 처리나 UV-B 0.5kJ 처리로 아스파라거스 순의 원예적 특성의 변화가 초래되지 않는 상태에서 비타민 C, 루틴, 총 페놀, 총 플라보노이드 등의 함량이 증가되고 자유기 소거능도 향상됨을 의미한다. 따라서 수확한 아스파라서스의 순에 적색광 12시간 또는 UV-B 0.5kJ을 처리하면 채소 또는 음료의 원료로 사용되는 아스파라거스 순의 기능성 품질을 증진시킬 수 있을 것으로 생각된다. Asparagus (Asparagus officinalis L.) spears were treated with white (color temperature 4,500 k), blue (peak 450 nm), and red (peak 660 nm) light-emitting diodes (LEDs) at a photosynthetic photon flux density (PPFD) of 200 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP> for 12 h, and UV-B (280 nm) at 0.5 kJ or 1.0 kJ to determine the effect on agronomic characteristics, antioxidant phytochemicals, and antioxidant activity. The fresh weight, length, and width of spears were not affected by light quality treatments. The free sugars and chlorophyll contents were increased by 9 and 41%, respectively in the UV-0.5 kJ treatments. Among the antioxidant phytochemicals (vitamin C, total phenol, rutin, and total flavonoid), vitamin C was most greatly affected by the light treatments. Vitamin C content was significantly increased in asparagus spears subjected to the white (114%), red (137%), and UV-0.5 kJ(127%) treatments compared to the control. By contrast, rutin, total phenol, and total flavonoid content were increased only in samples subjected to the red and UV-0.5 kJ treatment. Furthermore, antioxidant activity, as measured by DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity, increased in white, red, and UV-0.5 kJ treatments by about 43, 41, and 43%, respectively, compared to the control. These results suggest that postharvest treatment of asparagus spears with red light at 200 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP> for 12 h or with UV-B (280 nm) at 0.5 kJ could enhance the functional quality of the asparagus spears by increasing the content of phytochemicals like vitamin C, rutin, total phenolics, and total flavonoids.
유남희(Nam-Hee Yoo),이상민(Sang Min Lee),구민성(Min-Seong Koo),전진용(Jin Yong Jun) 대한사회정신의학회 2017 사회정신의학 Vol.22 No.1
목 적 : 탈북민 여성들의 신체화 증상에 영향을 미치는 요인을 알아보고자 이 연구를 수행하였다. 방 법 : 국내 입국한 북한이탈주민 중 한국판 역학연구센터 우울척도(the Center for Epidemiologic Studies-Depression scale, CES-D) 21점 이상의 우울 고위험군 242명을 대상으로 한국판 역학연구센터 우울척도(the Center for Epidemiologic Studies-Depression scale, 이하 CES-D) 점수와 간이정신진단검사(Symptom Checklist-90-Revision) 신체화 차원(이하 SCL-90R-SOM) 점수를 측정하였으며, 신체화 증상에 영향을 미치는 변수들을 측정 후 이에 대한 다중회귀분석을 실시하였다. 결 과 : 다른 변수의 영향을 통제한 다중회귀분석 결과 CES-D 점수가 높아질수록(t=5.013, p<0.001), 연령이 높아질수록(t=2.167, p=0.033) 신체화 증상의 점수가 높았다. 결 론 : 이 연구는 신체화 증상을 보이는 탈북민을 이해하는데 도움을 줄 것으로 생각된다. Objectives : This study was designed for an analysis of the related factors of somatic symptoms in depressive North Korean Refugee Women. Methods : We measured the related factors with the Center for Epidemiologic Studies-Depression scale (CES-D) scores and Symptom Checklist-90-Revision (SCL-90R-SOM) scores in North Korean Refugee Women whose CES-D scores were over 21. We performed the multiple regression test in depressive North Korean Refugee Women. Results : CES-D scores (t=5.013, p<0.001) and age (t=2.167, p=0.033) were significantly correlated with SCL-90R-SOM scores. Conclusion : This study will be helpful to understand the North Korean Refugee Women who have somatic symptoms.
개선된 자동 주파수 보정회로를 이용한 광대역 클록 발생기 설계
정상훈(Sang-Hun Jeong),유남희(Nam-Hee Yoo),조성익(Seong-Ik Cho) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
In this paper, a wideband clock generator using novel Automatic frequency calibration(AFC) scheme is proposed. Wideband clock generator using AFC has the advantage of small VCO gain and wide frequency band. The conventional AFC compares whether the feedback frequency is faster or slower then the reference frequency. However, the proposed AFC can detect frequency difference between reference frequency with feedback frequency. So it can be reduced an operation time than conventional methods AFC. Conventional AFC goes to the initial code if the frequency step changed. This AFC, on the other hand, can a prior state code so it can approach a fast operation. In simulation results, the proposed clock generator is designed for DisplayPort using the CMOS ring-VCO. The VCO tuning range is 350㎒, and a VCO frequency is 270㎒. The lock time of clock generator is less then 3us at input reference frequency, 67.5㎒. The phase noise is -109dBC/Hz at 1MHz offset from the center frequency. and power consumption is 10.1㎽ at 1.8V supply and layout area is 0.384㎟.
새로운 구조의 Tunable 4차 SC Bandpass Sigma-Delta 변조기
김재붕(Jae-Bung Kim),유남희(Nam-Hee Yoo),조성익(Seong-Ik Cho) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
Tunable SC(Switched Capacitor) bandpass Σ-Δ(Sigma-Delta) modulator used in wireless system receiver occurs a signal attenuation according to tuning of center frequency in signal bandwidth. In this paper, tunable bandpass 4th order SC bandpass Σ-Δ modulator with novel structure is proposed for rejection of signal attenuation in signal bandwidth. The existing structure uses a ten variable coefficient values for rejection of signal reduction in the modulator. But the proposed structure only use a two variable coefficient values for rejection of signal attenuation in the modulator. Also, an adder and comparator is replaced with a comparator having 4 inputs in the modulator. Therefore, the existing structure has one more OP-AMP. The purposed modulator was designed in 0.18 ㎛ CMOS technology. The resolution of the modulator within 310 ㎑ bandwidth and 40 ㎒ sampling frequency under 6.67 ㎒, 10 ㎒ and 13.33 ㎒ intermediate frequency are over 10 bit.
최기쁨(Kippeum Choi),유신성(Sin-Seong Yu),유남희(Nam-Hee Yoo),오효정(Hyo-Jung Oh) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.2
With the recent creation of a new agricultural environment and changes in weather conditions, the need to predict and prevent pests has increased and many studies are being conducted. However, previous studies do not provide information intuitively and difficult to search for information on the user’s farm due to the wide range of pest prediction. For this reason, this study proposes a web visualization method of a pest prediction and prevention model based on farm-map data, which is an electronic map of agricultural land, so that users can easily search and consume information on the farm. This study utilized a pest prediction machine-learning model based on various public bigdata. It aims to visualize the disease and pest prediction and prevention model based on IPM(Integrated Pest Management) for ecological smart farm by providing information on appropriate methods to all other adjacent farms as well as the farm of the user.
능이버섯(Sarcodon aspratus)으로부터 분리한 diketopiperazine계 화합물의 화학구조 및 항산화활성
김진우 ( Jin Woo Kim ),문병식 ( Byung Sik Moon ),박영민 ( Young Min Park ),유남희 ( Nam Hee Yoo ),유인자 ( In Ja Ryoo ),유익동 ( Ick Dong Yoo ),김종평 ( Jong Pyung Kim ),( Nguyen Thi Chinh ) 한국응용생명화학회 2005 Applied Biological Chemistry (Appl Biol Chem) Vol.48 No.1