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Reliability Evaluation of a Microgrid Considering Its Operating Condition
Xufeng Xu,Joydeep Mitra,Tingting Wang,Longhua Mu 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
Microgrids offer several reliability benefits, such as the improvement of load-point reliability and the opportunity for reliability-differentiated services. The primary goal of this work is to investigate the impacts of operating condition on the reliability index for microgrid system. It relies on a component failure rate model which quantifies the relationship between component failure rate and state variables. Some parameters involved are characterized by subjective uncertainty. Thus, fuzzy numbers are introduced to represent such parameters, and an optimization model based on Fuzzy Chance Constrained Programming (FCCP) is established for reliability index calculation. In addition, we present a hybrid algorithm which combines scenario enumeration and fuzzy simulation as a solution tool. The simulations in a microgrid test system show that reliability indices without considering operating condition can often prove to be optimistic. We also investigate two groups of situations, which include the different penetration levels of microsource and different confidence levels. The results support the necessity of considering operating condition for achieving accurate reliability evaluation.
Effects of quercetin derivatives from mulberry leaves
Xufeng Sun,Masayuki Yamasaki,Takuya Katsube,Kuninori Shiwaku 한국영양학회 2015 Nutrition Research and Practice Vol.9 No.2
BACKGROUND/OBJECTIVES: Mulberry leaves contain quercetin derivatives, which have the effects of reducing obesity and improving lipid and glucose metabolism in mice with obesity. It is not clear whether or not mulberry leaves can directly affect metabolic disorders, in the presence of obesity, because of the interaction between obesity and metabolic disorders. The aim of the current study was to assess the direct action of quercetin derivatives on metabolic disorders in non-obese conditions in short-term high-fat diet fed mice. MATERIALS/METHODS: C57BL/6N mice were fed a high-fat diet, supplemented with either 0% (control), 1%, or 3% mulberry leaf powder (Mul) or 1% catechin powder for five days. Anthropometric parameters and blood biochemistry were determined, and hepatic gene expression associated with lipid and glucose metabolism was analyzed. RESULTS: Body and white fat weights did not differ among the four groups. Plasma triglycerides, total cholesterol, and free fatty acids in the 1%, 3% Mul and catechin groups did not differ significantly from those of the controls, however, plasma glucose and 8-isoprostane levels were significantly reduced. Liver gene expression of gp91phox, a main component of NADPH oxidase, was significantly down-regulated, and PPAR-α, related to β-oxidation, was significantly up-regulated. FAS and GPAT, involved in lipid metabolism, were significantly down-regulated, and Ehhadh was significantly up-regulated. Glucose-metabolism related genes, L-PK and G6Pase, were significantly down-regulated, while GK was significantly up-regulated in the two Mul groups compared to the control group. CONCLUSIONS: Our results suggest that the Mul quercetin derivatives can directly improve lipid and glucose metabolism by reducing oxidative stress and enhancing β-oxidation. The 1% Mul and 1% catechin groups had similar levels of polyphenol compound intake (0.4 × 10<SUP>-5</SUP> vs 0.4 × 10<SUP>-5</SUP> mole/5 days) and exhibited similar effects, but neither showed dose-dependent effects on lipid and glucose metabolism or oxidative stress.
Three new sesquiterpene lactones from Inula britannica
Xufeng Zhang,Jing-Ling Du,Jie Ren,Feng-Mei Ye,Yang-Guo Xie,Xiangrong Cheng,Shi Kai Yan,Huizi Jin 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.5
One new 1,10-secoeudesmanolide (1), twoeudesmanolides (2 and 3), together with nine knowncompounds (4–12) were isolated from the aerial parts ofInula britannica. The structures of the new compoundswere elucidated by detailed spectroscopic analysis,including HRESIMS and 2D-NMR spectroscopic method. In addition, compounds 1–4 were tested for their inhibitoryeffects against LPS-induced NO production in RAW264.7macrophages.
Threshold Setting for LOS/NLOS Identification Based on Joint TOA and RSS
Xufeng Guan,Soojung Hur,박용완 대한임베디드공학회 2010 대한임베디드공학회논문지 Vol.5 No.3
Non-line-of-sight (NLOS) propagation is one of the challenges in radio positioning. Distinguishing the transmission status of the communication as line-of-sight (LOS) or NLOS is of great importance for the wireless communication systems. This paper focuses on the identification of NLOS based on time-of-arrival (TOA) distance estimates and the received signal strength (RSS) measurements. We set a path loss threshold based on the joint TOA and RSS based NLOS detection method to determine LOS or NLOS. Simulation results show that the proposed method ensures the correct of detection for the LOS condition and can improve the NLOS identification for the weak noise and long distance.
Xufeng Xiao,Caijun Wu,Zhiyun Xu,Yingui Yang,Shuying Fan,Heng Wang 한국유전학회 2015 Genes & Genomics Vol.37 No.4
Bolting and flowering enhance the commercial value of flowering Chinese cabbage. FLOWERING LOCUS C (FLC) and FRIGIDA (FRI) are two key flowering time genes in Arabidopsis thaliana. Here we reported on the cloning and characterization of three ‘classical’ genes from the autonomous pathway from flowering Chinese cabbage, BrcuFCA, BrcuFLD and BrcuFVE. The results of expression analysis showed BrcuFLC was a gradually up-regulated with the developmental stages. However, temporal mRNA expression of BrcuFRI, BrcuFCA, BrcuFVE, and BrcuFLD were found to follow the opposite transcription patterns. The spatial expression patterns of BrcuFCA, BrcuFLD, and BrcuFVE were similar with the highest levels in flowers, whereas the highest transcription levels of BrcuFLC occurred in leaves and stems and that of BrcuFRI in roots. We presumed that the main pathway of bolting– flowering regulation in flowering Chinese cabbage might be the autonomous pathway and different from the vernalization pathway and FRI-dependent pathway.