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LSTM 기반의 이상데이터가 포함된 센서 신호 예측 및 성능평가
채민선,하민호,박태형 제어·로봇·시스템학회 2023 제어·로봇·시스템학회 논문지 Vol.29 No.12
Sensors are being used in various fields such as smart factories, CPS, and digital twins. It is important to minimize and prevent losses by forecasting abnormal sensor signals when these sensors malfunction or when abnormal signals occur due to environmental effects. Recently, various studies have been conducted with LSTM, which is widely used as time series prediction, but there are not many studies that evaluate performance by applying this to sensor signals. In this study, an LSTM with excellent performance was designed with an optimal hyperparameter setting by applying a water distribution sensor containing 7-17% abnormal sensor data. In addition, as a result of performance comparison with ARIMA, it was found that LSTM was 94.29% superior on average in terms of precision and accuracy.
최기춘,황정민,방성준,김범태,김동헌,채민선,이승아,최기준,김다혜,이정채 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.5
Alfalfa (Medicago sativa L.) is commonly used as a traditional medicine and functional food. This study investigated the anti-inflammatory potential of alfalfa and the mechanisms involved. The chloroform extract of alfalfa aerial parts inhibited lipopolysaccharide (LPS)-stimulated immune responses more than ether, butanol, or water soluble extracts. Treatment with 1 μg/mL LPS increased nitrite concentrations to 44.3 μM in RAW267.4 macrophages, but it was reduced to 10.6 μM by adding 100 μg/mL chloroform extract. LPS treatment also increased the concentrations of tumor necrosis factor-α, interleukin (IL)-6, and IL-1β to 41.3, 11.6, and 0.78 ng/mL in culture supernatants of the cells, but these cytokine levels decreased to 12.5, 3.1, and 0.19 ng/mL, respectively, by pretreating with 100 μg/mL of the extract. ICR mice injected with LPS (30 mg/kg body weight) alone showed a 0% survival rate after 48 h of the injection, but 48-h survival of the mice increased to 60% after oral administration of the extract. Subfractions of the chloroform extract markedly suppressed LPS-mediated activation of the extracellular signal-regulated kinase and nuclear factor kappa-B. Cinnamic acid derivatives and fatty acids were found to be active constituents of the extract. This research demonstrated that alfalfa aerial parts exert anti-inflammatory activity and may be useful as a functional food for the prevention of inflammatory disorders.