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Wei Cui,Wei Yan,Wei-Jen Lee,Xia Zhao,Zhouyang Ren,Cong Wang 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
The increasing of wind power penetration level presents challenges in classical optimal reactive power dispatch (ORPD) which is usually formulated as a deterministic optimization problem. This paper proposes a two-stage stochastic programming model for ORPD by considering the uncertainties of wind speed and load in a specified time interval. To avoid the excessive operation, the schedule of compensators will be determined in the first-stage while accounting for the costs of adjusting the compensators (CACs). Under uncertainty effects, on-load tap changer (OLTC) and generator in the second-stage will compensate the mismatch caused by the first-stage decision. The objective of the proposed model is to minimize the sum of CACs and the expected energy loss. The stochastic behavior is formulated by three-point estimate method (TPEM) to convert the stochastic programming into equivalent deterministic problem. A hybrid Genetic Algorithm-Interior Point Method is utilized to solve this large-scale mixed-integer nonlinear stochastic problem. Two case studies on IEEE 14-bus and IEEE 118-bus system are provided to illustrate the effectiveness of the proposed method.
Cui, Wei,Yan, Wei,Lee, Wei-Jen,Zhao, Xia,Ren, Zhouyang,Wang, Cong The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
The increasing of wind power penetration level presents challenges in classical optimal reactive power dispatch (ORPD) which is usually formulated as a deterministic optimization problem. This paper proposes a two-stage stochastic programming model for ORPD by considering the uncertainties of wind speed and load in a specified time interval. To avoid the excessive operation, the schedule of compensators will be determined in the first-stage while accounting for the costs of adjusting the compensators (CACs). Under uncertainty effects, on-load tap changer (OLTC) and generator in the second-stage will compensate the mismatch caused by the first-stage decision. The objective of the proposed model is to minimize the sum of CACs and the expected energy loss. The stochastic behavior is formulated by three-point estimate method (TPEM) to convert the stochastic programming into equivalent deterministic problem. A hybrid Genetic Algorithm-Interior Point Method is utilized to solve this large-scale mixed-integer nonlinear stochastic problem. Two case studies on IEEE 14-bus and IEEE 118-bus system are provided to illustrate the effectiveness of the proposed method.
Yan-Li Ji,Wei-Jie Qian,Quan-Fu An,Kueir-Rarn Lee,Cong-Jie Gao 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
We have designed a novel type of thin-film nanocomposite (TFN) membranes with embedded polyelectrolyte nanoparticles (PNPs) and investigated their applicability in the separation of amino acids. PNP particles were mixed with piperazine (PIP) and interfacial polymerized with trimesoyl chloride (TMC), allowing for simultaneous improvement in water permeability, amino acid selectivity, and anti-fouling property. Separation performance could be conveniently tuned by modulating the chemical structure of PNPs and their content in TFN membranes, as well as adjusting the feed pH value. This work would promote the application of polyelectrolyte nanoparticles based TFN membranes in the separation and purification of amino acids.
Malondialdehyde Level by Ethanol Exposure in Mouse According to the ALDH2 Enzyme Activity
Lee, Chung-Jong,Kim, Yong-Dae,Kim, Sung-Hoon,Eom, Sang-Yong,Zhang, Yan Wei,Kim, Heon 대한의생명과학회 2008 Biomedical Science Letters Vol.14 No.1
Excessive alcohol consumption is associated with increased risks of many diseases including cancer. Individuals who regularly consume excessive quantities of alcohol have a greater risk of developing head and neck cancers such as esophageal, pharyngeal and oral cavity cancers if they are deficient in ALDH2 expression compared to normal populations. We evaluated lipid peroxidation in Aldh2 +/+ and Aldh2 -/- mice after they had been subjected to acute ethanol exposure. Malondialdehyde(MDA) level in liver tissue was evaluated as a biomarker of oxidative lipid peroxidation. Although the ethanol treatment did not increase the hepatic MDA level both in Aldh2 +/+ mice and in Aldh2 -/- mice, the MDA level was significant higher in the Aldh2 -/- mice than in the Aldh2 +/+ group. The MDA level was also significantly correlated with olive tail moment in blood and the level of 8-OHdG in liver tissue. This is a strong evidence to support our hypothesis that oxidative stress is more intense in Aldh2 -/- mice than in Aldh2 +/+ mice. Our results suggest that ALDH2-deficient individuals may be more susceptible than wild-type ALDH2 individuals to ethanol-mediated liver disease, including cancer.
Response of plasma rotation to resonant magnetic perturbations in J-TEXT tokamak
Yan, W,Chen, Z Y,Huang, D W,Hu, Q M,Shi, Y J,Ding, Y H,Cheng, Z F,Yang, Z J,Pan, X M,Lee, S G,Tong, R H,Wei, Y N,Dong, Y B IOP 2018 Plasma physics and controlled fusion Vol.60 No.3
<P>The response of plasma toroidal rotation to the external resonant magnetic perturbations (RMP) has been investigated in Joint Texas Experimental Tokamak (J-TEXT) ohmic heating plasmas. For the J-TEXT’s plasmas without the application of RMP, the core toroidal rotation is in the counter-current direction while the edge rotation is near zero or slightly in the co-current direction. Both static RMP experiments and rotating RMP experiments have been applied to investigate the plasma toroidal rotation. The core toroidal rotation decreases to lower level with static RMP. At the same time, the edge rotation can spin to more than 20 km s<SUP>−1</SUP> in co-current direction. On the other hand, the core plasma rotation can be slowed down or be accelerated with the rotating RMP. When the rotating RMP frequency is higher than mode frequency, the plasma rotation can be accelerated to the rotating RMP frequency. The plasma confinement is improved with high frequency rotating RMP. The plasma rotation is decelerated to the rotating RMP frequency when the rotating RMP frequency is lower than the mode frequency. The plasma confinement also degrades with low frequency rotating RMP.</P>
Li, Wei,Sun, Ya Nan,Yan, Xi Tao,Yang, Seo Young,Song, Seok Bean,Lee, Young Mi,Kim, Young Ho American Chemical Society 2013 Journal of agricultural and food chemistry Vol.61 No.29
<P>Twelve compounds, including six sucrose fatty acid esters (<B>1</B>–<B>6</B>), four galactosyl acylglycerols (<B>7</B>–<B>10</B>), and two sphingolipids (<B>11</B> and <B>12</B>), were isolated from the roots of Astragalus membranaceus. Their structures were identified on the basis of spectroscopic analysis. Among the isolated sucrose fatty acid esters, 6′-<I>O</I>-linoleyl sucrose (<B>1</B>) was identified as a new compound, and 6′-<I>O</I>-palmitoyl sucrose (<B>2</B>) and 6-<I>O</I>-palmitoyl sucrose (<B>3</B>) were isolated from nature for the first time. This is the first report on sucrose fatty acid ester components from <I>A. membranaceus</I>. The nuclear factor-κB (NF-κB) inhibitory activity of isolated compounds was measured in HepG2 cells stimulated with TNF-α using a luciferase reporter system. Among them, compounds <B>1</B>–<B>6</B> exhibited significant inhibition of NF-κB activation in a dose-dependent manner, with IC<SUB>50</SUB> values ranging from 4.4 to 24.7 μM. Compounds <B>1</B>–<B>6</B> also exhibited inhibition of TNF-α-induced expression of iNOS and ICAM-1 mRNA and dose-dependent inhibition of iNOS promoter activity, with IC<SUB>50</SUB> values ranging from 3.3 to 5.0 μM. These data demonstrate the potential of sucrose fatty acid esters from <I>A. membranaceus</I> to prevent and treat inflammatory diseases.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2013/jafcau.2013.61.issue-29/jf4017509/production/images/medium/jf-2013-017509_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jf4017509'>ACS Electronic Supporting Info</A></P>
Li, Wei,Ding, Yan,Quang, Tran Hong,Nguyen, Thi Thanh Ngan,Sun, Ya Nan,Yan, Xi Tao,Yang, Seo Young,Choi, Chun Whan,Lee, Eun Jung,Paek, Kee Yoeup,Kim, Young Ho Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
A new compound, perforaphenonoside A (1), along with 11 known compounds (2-12) were isolated from a methanol extract of adventitious roots of Hypericum perforatum. Their chemical structures were elucidated using chemical and physical methods as well as comparison of NMR and mass spectral data with previously reported data. Their inhibition of NF-${\kappa}B$ and activation of PPAR was measured in HepG2 cells using a luciferase reporter system. Among the compounds 3, 6, 7 and 12 inhibited NF-${\kappa}B$ activation stimulated by TNF${\alpha}$ in a dose-dependent manner, with $IC_{50}$ values ranging from 0.85 to $8.10{\mu}M$. Moreover, compounds 1-3, 7, 11 and 12 activated the transcriptional activity of PPARs in a dose-dependent manner, with $EC_{50}$ values ranging from 7.3 to $58.7{\mu}M$. The transactivational effects of compounds 1-3, 7, 11 and 12 were evaluated on three individual PPAR subtypes. Among them, compound 2 activated $PPAR{\alpha}$ transcriptional activity, with 153.97% stimulation at $10{\mu}M$, while compounds 1, 2 and 11 exhibited transcriptional activity of $PPAR{\gamma}$, with stimulation from 124.76% to 126.91% at $10{\mu}M$.