A5078933656- Phytochemicals and Antioxidant Activities
- solar cell performance optimization
- Photovoltaic System Optimization Techniques
- Solar Thermal and Photovoltaic Systems
- Food Quality and Safety Studies
- Solar Radiation and Photovoltaics
- Dyeing and Modifying Textile Fibers
- Free Radicals and Antioxidants
- Polysaccharides and Plant Cell Walls
- Agriculture, Soil, Plant Science
- Essential Oils and Antimicrobial Activity
- Chemotherapy-induced organ toxicity mitigation
- Olfactory and Sensory Function Studies
- Ecology and Conservation Studies
- Internet of Things and Social Network Interactions
- Fungal Biology and Applications
- Cancer Treatment and Pharmacology
- melanin and skin pigmentation
- Cynara cardunculus studies
- Skin Protection and Aging
- Pharmacological Effects of Natural Compounds
- Ginseng Biological Effects and Applications
- Natural product bioactivities and synthesis
- Phytochemistry and Biological Activities
- Engineering Applied Research
Kyungpook National University
2023-2024
Sunchon National University
2012-2021
National Development Institute of Korean Medicine
2018
Black ginseng (BG) is processed traditionally made in Korea via the steaming and drying of root through three or more cycles, leading to changes its appearance due Maillard reaction on surface, resulting a dark coloration. In this study, we explored markers for differentiating by analyzing chemical characteristics BG. We elucidated new method structural identification ginsenoside metabolites described features using UPLC-QTOF-MS positive ion mode. confirmed that maltose, glucose, fructose,...
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The aim of this study was to identify the optimal extraction conditions for leaves Osmanthus fragrans var. aurantiacus. Inhibitory effects various extracts on NO production were compared. Antioxidant evaluations total phenol and flavonoid contents carried out using O. aurantiacus obtained under that showed greatest effect production. method extracting resulted in an extract named OP OFLE. OFLE DPPH ABTS radical scavenging activities a concentration-dependent manner. Phillyrin (PH) isolated...
The succulent plant Aeonium sedifolium leaves contain several compounds that are of interest for their cosmetic uses on the skin. This study measured inhibitory effects enzyme production and antioxidant, astringent skin wrinkles using (ASL). total phenolics (TPC) content ASL under optimal extraction conditions was 34.49 mg/g hot water extract (ASLW) 61.64 50% ethanol (ASLE). ASLW ASLE extracts were freeze-dried, powdered, used as solids. TPC content, 2,2-diphenyl-1-picrylhydrazy (DPPH)...
This paper proposes the active module considering shadow influence of photovoltaic system. The PV system is consisted series-parallel connection module. voltage and current between modules become imbalance when occurs to If series module, output limited shaded Also if parallel These problems are caused power loss. Therefore, this that fixed variable can compensates by changing a occurred A validity proposed in proves through comparing with performance conventional
This study was designed to compare the effects on antioxidant, whitening, and anti-wrinkle improvement of 60% ethanol extracts from Trigonotis radicans var. sericea (TR) Lactobacillus brevis-fermented T. (FTR). The total phenolics contents TR 18.6 mg/g, FTR 18.2 mg/g. HPLC analysis confirmed more phenolic compounds were produced in by bioconversion than TR. showed higher 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity results 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic...
This study was designed to compare the whitening effects of 60% ethanol extracts Trigonotis radicans var. sericea (TR) and Lactobacillus brevis-fermented T. (FTR). Measurement cytotoxicity in B16-F10 melanoma cells confirm effect, FTR showed higher cell viability than TR. inhibitory activity on melanin contents similar normal group at concentrations 50 100 μg/mL. MITF expression used effect melanogenesis-related protein expression. TR significant concentration-dependent decrease, lower...
This paper proposes a variable step size incremental conductance(VSSIC) method for the maximum power point tracking(MPPT) control of photovoltaic. The conventional perturbation & observation(PO) and IC MPPT algorithm generally uses fixed size. A small will cause tracking speed to decrease accuracy MPP due large Therefore, this VSSIC that adjusts automatically according operating conditions. To improve accuracy, when is far from point(MPP), value near MPP, adjust slope curve. validity...
This paper proposes novel MPPT method of photovoltaic system with temperature coefficient. The conventional CV(Constant Voltage) and PO(Perturbation Observation) methods have the weak problem about radiation change. Thus, in this paper, order to improve problem, optimal voltage current is determined control performed. algorithm proposed analyzes performance change proves validity.
Fresh mushrooms are vulnerable to browning and tissue changes after harvest. This study monitored the external appearance, physicochemical quality indicators, nutritional functional components of a white beech mushroom (Hypsizygus marmoreus) variety (EG2020) newly developed in Korea during cold storage for up 42 days. Two existing varieties H. marmoreus, namely H6 from HKT Japan, were used comparison. The mechanical texture EG2020 was superior due increasing hardness pileus with time....