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양기숙,김지연 숙명여자대학교 약학연구소 2001 약학논문집-숙명여자대학교 Vol.17 No.-
Acanthopanax species(Araliaceae) traditionally has been used as analgesics, stimulant of immune system, and replenishment of body functions. Acanthopanax divaricatus var. albeofructus is a new variety and indigenous plant to Korea. The antioxidant activities of leaf and root bark of A. divaricatus var. albeofructus were determined by l,l-diphenyl-2-picrylhydrazyl (DPPH) method and thiobarbituric acid reactive substance (TBARS) assay on human plasma low density lipoprotein (LDL) in vitro system. The extracts of leaf and root bark showed antioxidant activities and the leaf exhibited more potentially in Cu^(2+) induced LDL oxidation than root bark.
데이터 증강 방법을 이용한 정상데이터 기반 베어링 이상 진단법
배재웅(Jaewoong Bae),정원호(Wonho Jung),박용화(Yonghwa Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
최근 데이터 불균형 문제를 해결하기 위해 고장데이터 증대 연구가 활발하다. 하지만 분포 학습기반 고장데이터 증대 기법은 데이터 특성에 따라 크게 변해 고장 진단 방법론에 적용이 어렵다. 본 연구에서는 고장 데이터 없이 정상 데이터 기반 베어링 이상 진단 기법을 제안한다. 제안된 방법은 세 단계로 구성된다: (1) 정상데이터 기반 데이터 증강, (2) 컨볼루션 신경망 기반 특성인자 추출, 그리고 (3) 이상 기준치 설계. 정상데이터 기반 데이터 증강 방법은 데이터 특성에 맞춰 노이즈 추가, 진폭 변조 등을 활용한다. 특성인자 추출을 위해 ResNet 을 이용하여 정상데이터 특성인자를 추출한다. 마지막으로 추출된 특성인자를 이용하여 정상데이터와 이상데이터 간의 거리를 계산하여 이상 기준치를 선정한다. CWRU 베어링 결함 데이터셋을 이용하여 제안된 방법을 검증하였고 약 95% 이상 진단 정확도를 보였다. 본 연구는 정상데이터만을 이용하여 데이터 불균형 환경 속에서도 이상 진단이 가능함을 보였다. A research on data augmentation has been actively conducted to solve the data imbalance problem. However, data distribution learning based data augmentation method is difficult to apply to fault diagnosis methodology because fault data distribution varies under the characteristics of their dataset. This paper proposes ball bearing anomaly detection method based on normal data only. The proposed method consists of three stages: (1) data augmentation based using normal data, (2) feature extraction using convolutional neural networks, and (3) design anomality threshold. The normal data-based augmentation method utilizes adding noise, amplitude variation under consideration of the data characteristics. ResNet architecture is used for feature extraction. Finally, anomality threshold is selected by calculating the distance between normal data and abnormal data. The proposed method was verified using the CWRU bearing dataset and presented a diagnostic accuracy of about 95%. This study expects that it is possible to diagnose abnormalities even in a data imbalance using only normal data.
머위메탄올 추출물이 사염화탄소에 의한 간독성에 미치는 영향
양기숙 숙명여자대학교 약학연구소 2004 약학논문집-숙명여자대학교 Vol.21 No.-
Petasites japonicus(Compositae) is a perennial herb which has been used as analgesic, antitussive, expectorant, sedative in folk remedies. We examined anti-lipid peroxidative and liver protective effects of MeOH extract of it on CCI₄ induced lipid peroxidation and hepatotoxicity in rats. The anti-lipid peroxidation activity of them showed by dose dependency and especially, administration group 2.0 g/kg was recovered as normal group. Serum transaminase, GOT, GPT and A1P activities increased by carbontetrachloride were significantly decreased by administration of MeOH extract. From the above results, it can be summerized that Petasites japonicus has anti-lipid peroxidative and liver protective effects.
천연자원약물개발에 관한 연구 : 담쟁이덩굴이 흰쥐 신기능에 미치는 영향 Effect of Parthenocissus tricuspidata on rat kidney function
양기숙 숙명여자대학교 약학연구소 1996 약학논문집-숙명여자대학교 Vol.12 No.-
The Stem and the Radix of Parthenocissus tricuspidate (Vitaceae) have been used in arthrities laryngitis, jundice, neuralgia, renal insufficiency in folk remedies. In order to investigate the effects of their water extractums. on kidney function of normal and acute renal failure rats induced by the single s.c. injection of 2mg/kg HgCl_2, urinary volume, excretion rates of Na, K, Cl, serum chemical parameters were measured. The radix ex. 1.0g/kg showed significant diuretic action at 1-2hr. after administration. In renal failure group, the stem rather than the radix increase urin volume, electrolyte excretion at 2-5hr. after administration compared with 4-5hr. of furosemide and they didn't affect the level of serum parameters.
양기숙 숙명여자대학교 약학연구소 2004 약학논문집-숙명여자대학교 Vol.20 No.-
Arctium lappa(Compositae) has been used as antiinflammatory, antitoxic and diuretic in folk remedies. It was examined diuretic action of seed, root and leaf of it in normal and mercuric chloride intoxicated rat. Urine volume, urinary electrolyte and chemical parameters in blood serum were determined. MeOH extracts of seed and leaf showed the significant diuretic activities.
큰개별꽃의 flavonoid분리 및 생물학적효능에 관한 연구
양기숙(Ki-Sook Yang),김태희(Tea-Hee Kim) 한국생약학회 1982 생약학회지 Vol.13 No.4
Pseudostellaria palibiniana Ohwi (Caryophyilaceae) plant is perennial hero which is growing uprightly in the mountains, and characteristicaily bloom in closed flower. This plant has been used for foods as wild greens or the relief famining foods in the folk and medicinally used for galactogogue, emmenagogue and hemorrhoidal remedy. An attempt was made to identify the flavonoid compound and biological activity. Compound A was isolated by silicagel and sephadex LH-20 column chromatography. Compound A, C_(21)H_(22)O<sub>11</sub> mp 220∼222˚, [α]_(20)^0 -182 (in Methanol) flavone-C-glycoside was islated by silicagel and sephadex LH-20 column chromatography. It was identified to be 6-C-β-D-glucopyranose apigenin through physicochemical approaches compared with literated data and UV, IR, NMR spectra.