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A Photovoltaic Power Management System using a Luminance-Controlled Oscillator for USN Applications
정지은,배준한,이지웅,이선영,전정훈,권기원 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.1
This paper presents a power managementsystem of the dye-sensitized solar cell (DSSC) forubiquitous sensor network (USN) applications. Thecharge pump with a luminance-controlled oscillatorregulates the load impedance of the DSSC to track themaximum power point (MPP) under various lightintensities. The low drop-out regulator with ahysteresis comparator supplies intermittent powerpulses that are wide enough for USN to communicatewith a host transponder even under dim lightconditions. With MPP tracking, approximately 50%more power is harvested over a wide range of lightintensity. The power management system fabricatedusing 0.13 μm CMOS technology works with DSSC toprovide power pulses of 36 μA. The duration of pulsesis almost constant around 80 μs (6.5 nJ/pulse), whilethe pulse spacing is inversely proportional to the lightintensity.
정지은,신승미,김혜민,이상현,최경,박광우,구자정,조은주 대한암예방학회 2011 Journal of cancer prevention Vol.16 No.1
This study was conducted to screen of Korean folk plants (KFP) with radical scavenging effect and prevention effect from gastric cancer. Scavenging activities on 1,1-diphenyl-2-picrylhydrazyl (DPPH) and hydroxyl radical (ㆍOH), microbial inhibition activity against Helicobacter pylori (H. pylori) and growth inhibitory effects in human gastric adenocarcinoma cells (AGS) were investigated. In DPPH scavenging activity at 50μg/ml, 18 plants showed over 80% scavenging activity, particularly Adriana acerifolia (leaf and branch) and Camellia synaptica (leaf, branch and seed) showed over 90% scavenging effect against DPPH. In addition, Chrysanthemum boreale (leaf and branch), Zanthoxylum schinifolium (branch), Clerodendrum trichotomum (branch), Rumex crispus (rachis), Sambucuss williamsii var. coreana (unbloom flower), Lespedeza cuneate (branch), Chrysanthemum indicum (flower) and Hibiscus hamabo (leaf) showed over 60% ㆍOH scavenging activity at 100μg/ml. Z. schinifolium (branch) showed the strongest antimicrobial activity (clear zone>17 mm) against H. pylori and the 15 plants including Z. schinifolium (branch), showed strong antimicrobial effect (clear zone >11 mm) at 10 μg/30μl. C. indicum (flower), Cedrela sinensis (leaf), Chrysanthemum pallasianum (leaf and branch), Adriana acerifolia (leaf and branch), Antithriscus sylvestris, Allium victorialis var. platyphyllum and Chelidonium majus var. asiaticum inhibited the growth of AGS cell by up to 80% at 100μg/ml. In conclusion, Among KFP, Z. schinifolium (branch), C. boreale (leaf and branch), C. indicum (flower) and A. tataricus (flower) showed strong radical scavenging activity and prevention effect against H. pylori and gastric cancer, suggesting as new resources for development of many purposes including functional food or drug with preventive effect from degenerative diseases. (Cancer Prev Res 16, 65-73, 2011)
정지은,우한영,우신재,Van Sang Le,최혜진 한국고분자학회 2014 Macromolecular Research Vol.22 No.5
Conjugated polyelectrolytes (CPEs) have been studied extensively as the optical platform for chemo- andbiosensor applications with high sensitivity by virtue of their light harvesting effect. A range of fluorescent CPEsbasedsensing schemes have been developed by utilizing fluorescence quenching via photo-induced electron transferand fluorescence resonance energy transfer, etc. Highly sensitive and selective detection assays can be realized bycombining the tunable optical properties of synthetic CPEs with specific binding characteristics of biomolecules(such as aptamer, antibody, protein, etc.). This article reviews the range of fluorescence-based optical assays with theCPEs-biomolecule complex as a signaling platform with in situ detection, remarkable sensitivity and selectivity, etc.
인공광 식물공장에서 수경 재배한 삼채 잎과 뿌리의 기능성
정지은,허정욱,김지수,정운율,배의진,장하나,심창기,정윤조,이성현 한국식품영양과학회 2022 한국식품영양과학회지 Vol.51 No.12
본 연구에서는 인공광 식물공장에서 수경 재배한 삼채의 항산화, 면역증진 및 항당뇨 효과를 평가하고, 노지 재배된 삼채의 생리활성과 비교하였다. 인공광원으로 형광등과 LED를 이용하여 재배한 삼채는 잎과 뿌리 부위로 나눠 분석하였다. 연구 결과, 사이클로알린 함량은 노지에서 재배된 삼채에서 많았고 총 페놀 함량은 잎에서 뿌리보다 2배 이상 많았으며, 노지 재배된 삼채 잎과 인공광 재배된 뿌리 추출물에서 총 페놀 함량이 많게 나타났다. DPPH 및 ABTS 라디칼 소거능을 포함한 항산화 활성도 잎에서 뿌리보다 높았고, 형광등 조사한 삼채 잎에서 높은 경향을 보였다. 본 실험에 사용된 잎과 뿌리의 추출물은 RAW264.7 세포에 대해 독성을 나타내지 않았고, 삼채 뿌리에서 잎보다 NO 생성량이 많았다. 또한 α-amylase와 α-glucosidase 저해 활성은 형광등을 조사한 삼채 잎 추출물(100 μg/mL)과 LED를 조사한 삼채 뿌리 추출물에서 가장 높은 경향을 보였다. 따라서 인공광원의 조절로 기능 성분 및 기능성을 개선할 수 있을 것으로 기대되며, 동물실험 등의 확인을 통해 연중 안정적 공급이 가능한 소비자 맞춤형 농산물 생산에 기여할 수 있을 것으로 보인다.