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Weixin Wang,Fengjiang Wu,Ke Zhao,Li Sun,Jiandong Duan,Dongyang Sun 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
Battery energy storage devices (ESDs) have become more and more commonplace to maintain the stability of islanded power systems. Considering the limitation in inverter capacity and the requirement of flexibility in the ESD, the droop control was implemented in paralleled ESDs for higher capacity and autonomous operation. Under the conventional droop control, state-of-charge (SoC) errors between paralleled ESDs is inevitable in the discharging operation. Thus, some ESDs cease operation earlier than expected. This paper proposes an adaptive accelerating parameter to improve the performance of the SoC error eliminating droop controller under the constraints of a microgrid. The SoC of a battery ESD is employed in the active power droop coefficient, which could eliminate the SoC error during the discharging process. In addition, to expedite the process of SoC error elimination, an adaptive accelerating parameter is dedicated to weaken the adverse effect of the constraints due to the requirement of the system running. Moreover, the stability and feasibility of the proposed control strategy are confirmed by small-signal analysis. The effectiveness of the control scheme is validated by simulation and experiment results.
Flow-based Anomaly Detection Using Access Behavior Profiling and Time-sequenced Relation Mining
( Weixin Liu ),( Kangfeng Zheng ),( Bin Wu ),( Chunhua Wu ),( Xinxin Niu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.6
Emerging attacks aim to access proprietary assets and steal data for business or political motives, such as Operation Aurora and Operation Shady RAT. Skilled Intruders would likely remove their traces on targeted hosts, but their network movements, which are continuously recorded by network devices, cannot be easily eliminated by themselves. However, without complete knowledge about both inbound/outbound and internal traffic, it is difficult for security team to unveil hidden traces of intruders. In this paper, we propose an autonomous anomaly detection system based on behavior profiling and relation mining. The single-hop access profiling model employ a novel linear grouping algorithm PSOLGA to create behavior profiles for each individual server application discovered automatically in historical flow analysis. Besides that, the double-hop access relation model utilizes in-memory graph to mine time-sequenced access relations between different server applications. Using the behavior profiles and relation rules, this approach is able to detect possible anomalies and violations in real-time detection. Finally, the experimental results demonstrate that the designed models are promising in terms of accuracy and computational efficiency.
Weixin Dong,Gang Lu,Yangling Jiang,Fan Zhou,Xia Liu,Chunxia Lu Techno-Press 2023 Advances in nano research Vol.15 No.3
Combination of novel technologies with traditional physiotherapy in rehabilitation in injured athletes have shown to provide improved time of recovery. In specific, nanodrugs delivery systems are widely utilized as a counterpart to the physiotherapy in injuries in sports. In the present study, we focus on the common injuries in dance-sports, their recovery and the effect combination of nano-particle drug delivery with the physiotherapy practices. In this regard, a comprehensive review on the common injuries in dance sport is provided. Moreover, the researches on the effectiveness of the nano-particle drug delivery in therapy of such injuries and in similar cases are provided. The possibility of using combination of nano-particle drug delivery and physiotherapy is discussed in detail. Finally, using artificial intelligence methods, predictions on the recovery time and after-treatment side-effects is investigated. Artificial Neural Network (ANN) predictions suggested that using nano-particle drug delivery systems along with physiotherapy practices could provide shortened treatment time to recovery in comparison to conventional drugs. Moreover, the post-recover effects are less than the conventional methods.
Weixin Liu,Yingjie Yang,Qianqian Liu 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.4
To preserve and propagate valuable Chinese cabbage (Brassica rapa L.) using mature vegetative organs without seeds, we established a high efficiency regeneration system from heading leaf explants and further explored its application in genetic transformation. Our results showed that maximum shoot regeneration of cultivars ‘Beijing New No. 3’ (88.46 ± 1.65%) and ‘Chengyangqing’ (73.77 ± 1.73%) were obtained in the presence of 17.76 μM 6-benzylaminopurine (BA) and 5.37 μM α-naphthylacetic acid (NAA). The addition of silver nitrate (AgNO3) at 11.77 μM was essential for shoot regeneration from heading leaf explants. Genotypic differences in shoot regeneration frequencies (from 47.24 ± 3.65 to 88.46 ± 1.65%) were observed amongst eight Chinese cabbage cultivars, in addition to the number of shoots per explant (from 1.31 ± 0.02 to 2.02 ± 0.05) in Murashige and Skoog medium containing 17.76 μM BA, 5.37 μM NAA and 11.77 μM AgNO3. Low temperature (4 °C) had an effect on in vitro preservation of leafy heads with a delay in leaf wilting, and there were no significant differences in shoot induction frequency within 24 h for cultivars ‘Beijing New No. 3’ and ‘Chengyangqing’. In the genetic transformation experiments using selection with kanamycin (17.17 μM), a transformation efficiency of 0.6–1.2% was achieved, as assessed from PCR and Southern blot results. The above results suggested that the heading leaf explants can not only achieve efficient seed-independent propagation of Chinese cabbage, but also provide a feasible platform for genetic transformation.
Weixin Li,Li-Xia Mu,Leiyan Wu,Yu-Xiao Zou,Hai-Feng Zhao,Sen-Tai Liao 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.2
The effects of silkworm pupa protein hydrolysates (SPPHs) on the apoptosis of MGC-803 gastric cancer cells were investigated in this study. The role of mitochondrial-dependent apoptosis in SPPHs-dependent inhibition of MGC-803 cell viability was also explored. SPPHs were found to induce apoptosis in MGC-803 cells with an IC 50 of 0.30 mg/ml. A series of changes in cellular organelle structural were observed during MGC-803 cell apoptosis that included mitochondrial swelling, vacuolation and rupture. These changes may ultimately impact on metabolic energy supply in MGC-803 cells. The expression of the pro- and anti-apoptotic proteins Bcl-2 and Bax, and the activation of cytochrome c (Cyt C), Caspase-3 and Caspase-9 were altered following induction of apoptosis by SPPHs in MGC-803 cells. Moreover, the increase in the ratio of Bax to Bcl-2 expression is known to play an important role in the activation of the mitochondrial-dependent apoptotic pathway.
Weixin Tao,Myung Hwan Lee,Jing Wu,Nam Hee Kim,이선우 한국미생물학회 2011 The journal of microbiology Vol.49 No.2
A novel esterase gene, estDL30, was isolated from an alluvial metagenomic library using function-driven screening. estDL30 consisted of 1,524 nucleotides and encoded a 507-amino acid protein. Sequence analysis revealed that EstDL30 is similar to many type B carboxylesterases, containing a G-E-S-A-G pentapeptide with a catalytic Ser residue. Phylogenetic analysis suggested that EstDL30 belongs to the family VII lipases, together with esterases from Bacillus subtilis (P37967), Streptomyces coelicolor A3(2) (CAA22794), and Arthrobacter oxydans (Q01470). Purified EstDL30 showed its highest catalytic efficiency toward p-nitrophenyl butyrate,with a kcat of 229.3 s^(-1) and kcat/K_m of 176.4 s^(-1)mM^(-1); however, little activity was detected when the acyl chain length exceeded C8. Biochemical characterization of EstDL30 revealed that it is an alkaline esterase that possesses maximal activity at pH 8 and 40°C. The effects of denaturants and divalent cations were also investigated. EstDL30 tolerated well the presence of methanol and Tween 20. Its activity was strongly inhibited by 1 mM Cu^(2+) and Zn^(2+), but stimulated by Fe^(2+). The unique properties of EstDL30, its high activity under alkaline conditions and stability in the presence of organic solvents, may render it applicable to organic synthesis.
Zhang Weixin,An Ning,Guo Junqi,Wang Zhixing,Meng Xiangfeng,Liu Weifeng 한국미생물학회 2021 The journal of microbiology Vol.59 No.4
The prominent protein producing workhorse Trichoderma reesei secretes a typical yellow pigment that is synthesized by a gene cluster including two polyketide synthase encoding genes sor1 and sor2. Two transcription factors (YPR1 and YPR2) that are encoded in the same cluster have been shown to regulate the expression of the sor genes. However, the physiological relevance of the yellow pigment synthesis in T. reesei is not completely clear. In this study, a yellow pigment hyper-producer OEypr1 and three yellow pigment non-producers, OEypr1-sor1, Δypr1, and OEypr2, were constructed. Their phenotypic features in mycelial growth, conidiation, cell wall integrity, stress tolerance, and cellulase production were determined. Whereas hyperproduction of the yellow pigment caused significant defects in all the physiological aspects tested, the non-producers showed similar colony growth, but improved conidiation, maintenance of cell wall integrity, and stress tolerance compared to the control strain. Moreover, in contrast to the severely compromised extracellular cellobiohydrolase production in the yellow pigment hyperproducer, loss of the yellow pigment hardly affected induced cellulase gene expression. Our results demonstrate that interfering with the yellow pigment synthesis constitutes an engineering strategy to endow T. reesei with preferred features for industrial application.