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- 저자 : Dandan Liu (검색결과 47 건)
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Research of the Mechanism of Low Frequency Oscillation Based on Dynamic Damping Effect
Liu, Wenying,Ge, Rundong,Zhu, Dandan,Wang, Weizhou,Zheng, Wei,Liu, Fuchao The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
For now, there are some low frequency oscillations in the power system which feature low frequency oscillation with positive damping and cannot be explained by traditional low frequency oscillation mechanisms. Concerning this issue, the dynamic damping effect is put forward on the basis of the power-angle curve and the study of damping torque in this article. That is, in the process of oscillation, damping will dynamically change and will be less than that of the stable operating point especially when the angle of the stable operating point and the oscillation amplitude are large. In a situation with weak damping, the damping may turn negative when the oscillation amplitude increases to a certain extent, which may result in an amplitude-increasing oscillation. Finally, the simulation of the two-machine two-area system verifies the arguments in this paper which may provide new ideas for the analysis and control of some unclear low frequency phenomena.
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Dandan Liu,이찬호 한국유통경영학회 2024 유통경영학회지 Vol.27 No.1
Purpose: This paper analyzes whether corporate social responsibility (CSR) affects executive compensation-performance sensitivity. Furthermore, it analyzes whether there are differences in the effect of CSR on executive compensationperformance sensitivity between state-owned (SOEs) and non-state-owned enterprises (NSOEs), based on the ownership structure of Chinese companies. This provides a foundation for the implementation of performance evaluation systems tailored to ownership types in enterprises. Research design, data, and methodology: This paper uses data from 9,984 manufacturing companies listed on the China Securities Exchange from 2015 to 2020 for empirical analysis. The ownership structures of Chinese enterprises are categorized into state-owned and non-state-owned, while executive compensation is defined as the total compensation of executives based on previous studies. CSR is measured by reference to the Hexun Corporate Social Responsibility Rating System, using the total CSR score. And enterprise performance is measured by return on assets (ROA). Results: Firstly, there is a significant positive correlation between CSR and the sensitivity of executive compensation-accounting performance. The results support the principal-agent theory, indicating that executives may use the fulfillment of CSR as a pretext to leverage their power in increasing personal compensation and subsequently enhancing the sensitivity of executive compensation-performance. Secondly, in comparison to NSOEs, the fulfillment of CSR by executives in SOEs is significantly negative correlation with the sensitivity of executive compensation-accounting performance at the 1% level. Implications: In analyzing the relationship between CSR and the executive compensation-performance sensitivity for Chinese A-share listed companies, this p aper i s unique in that i t analyzes t he d if efrential e f efcts o f CSR fulfillment by executives in SOEs and NSOEs. It suggests that the effect of CSR on executive compensation-performance sensitivity varies based on the ownership structure. These differences may hold practical significance for executive compensation and CSR decision-making.
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Research of the Mechanism of Low Frequency Oscillation Based on Dynamic Damping Effect
Wenying Liu,Rundong Ge,Dandan Zhu,Weizhou Wang,Wei Zheng,Fuchao Liu 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
For now, there are some low frequency oscillations in the power system which feature low frequency oscillation with positive damping and cannot be explained by traditional low frequency oscillation mechanisms. Concerning this issue, the dynamic damping effect is put forward on the basis of the power-angle curve and the study of damping torque in this article. That is, in the process of oscillation, damping will dynamically change and will be less than that of the stable operating point especially when the angle of the stable operating point and the oscillation amplitude are large. In a situation with weak damping, the damping may turn negative when the oscillation amplitude increases to a certain extent, which may result in an amplitude-increasing oscillation. Finally, the simulation of the two-machine two-area system verifies the arguments in this paper which may provide new ideas for the analysis and control of some unclear low frequency phenomena.
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Fuchen Liu,Zonglai Liang,Jingwen Xu,Wei Liu,Dandan Zhao,Yuying Zhao,Chuanzhu Yan 대한신경과학회 2016 Journal of Clinical Neurology Vol.12 No.3
Background and PurposezzTe wnt/β-catenin signaling pathway plays a critical role in embryonic development and adult-tissue homeostasis. Recent investigations implicate the importance of wnt/β-catenin signaling in normal wound healing and its sustained activation being associated with fbrogenesis. We investigated the immunolocalization and activation of wnt/β-catenin in polymyositis (PM), dermatomyositis (DM), and Duchenne muscular dystrophy (DMD). MethodszzImmunofuorescence staining and Western blot analysis of β-catenin were performed in muscle specimens from 6 PM, 8 DM, and 6 DMD subjects. Te β-catenin/Tcf4 DNA-binding activity in muscle was studied using an electrophoretic mobility shif assay (EMSA), and serum wnt/β-catenin/Tcf transcriptional activity was measured using a luciferase reporter gene assay. ResultszzImmunoreactivity for β-catenin was found in the cytoplasm and nuclei of muscle fbers in PM, DM, and DMD. Te protein level of β-catenin was elevated, and EMSA analysis confrmed the activation of wnt/β-catenin signaling. Te transcriptional activities of β-catenin/ Tcf in the circulation were increased in patients with PM, DM, and DMD, especially in those with interstitial lung disease, and these transcriptional activities decreased when PM or DM patients exhibited obvious clinical improvements. ConclusionszzOur fndings indicate that wnt/β-catenin signaling is activated in PM, DM, and DMD. Its activation in muscle tissue and the circulation may play a role in modulating muscle regeneration and be at least partly involved in the process of muscle and pulmonary fbrosis.
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KRAB family is involved in network shifts in response to osmotic stress in camels
Dandan Cao,Shenyuan Wang,Dong Zhang,Yanru Zhang,Junwei Cao,Yongbin Liu,Huanmin Zhou 한국통합생물학회 2022 Animal cells and systems Vol.26 No.6
A feature of the camel is its tolerance to osmotic stress. However, few studies of osmotic stress in vivo or comparative analyses between different tissues of the camel have been performed. Here, we report the roles of Krüppel-associated box domain containing zinc-finger repressor proteins (KRAB-ZFPs) in transcriptional networks under osmotic stress in camels by analyzing transcriptomes of four different tissues under various osmotic conditions. We found that 273 of 278 KRAB-ZFPs were expressed in our data set, being involved in all of the 65 identified networks and exhibiting their extensive functional diversity. We also found that 110 KRAB-ZFPs were hub genes involved in more than half of the networks. We demonstrated that the osmotic stress response is involved in network shifts and that KRAB-ZFPs mediate this process. Finally, we presented the diverse mechanisms of osmotic stress responses in different tissues. These results revealed the genetic architecture of systematic physiological response in vivo to osmotic stress in camels. Our work will lead to new directions for studying the mechanism of osmotic stress response in anti-arid mammals.
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Dandan Zhang,Nan Liang,Zhongping Shi,Liming Liu,Jian Chen,Guocheng Du 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.2
This manuscript aimed at increasing the production of α-ketoglutarate by the multi-vitamin auxotrophic yeast Torulpsis glabrata CCTCC M202019. The carbon flux was redistributed from pyruvate to α-ketoglutarate node by manipulating the specific activity of pyruvate dehydrogenase complex (PDH), pyruvate carboxylase (PC), pyruvate decarboxylase (PDC), and α-ketoglutarate dehydrogenase complex (KGDH). By proper increase of PDH, PC, and PDC activities, α-ketoglutarate in fermentation broth could be accumulated to the levels of 17.1 g/L, 21.6 g/L, and 31.2 g/L, respectively. In addition, decrease in the specific activity of KGDH also resulted in an enhanced α-ketoglutarate synthesis. With a proposed combinational enzymes regulation strategy, the highest α-ketoglutarate concentration of 37.7 g/L was achieved This manuscript aimed at increasing the production of α-ketoglutarate by the multi-vitamin auxotrophic yeast Torulpsis glabrata CCTCC M202019. The carbon flux was redistributed from pyruvate to α-ketoglutarate node by manipulating the specific activity of pyruvate dehydrogenase complex (PDH), pyruvate carboxylase (PC), pyruvate decarboxylase (PDC), and α-ketoglutarate dehydrogenase complex (KGDH). By proper increase of PDH, PC, and PDC activities, α-ketoglutarate in fermentation broth could be accumulated to the levels of 17.1 g/L, 21.6 g/L, and 31.2 g/L, respectively. In addition, decrease in the specific activity of KGDH also resulted in an enhanced α-ketoglutarate synthesis. With a proposed combinational enzymes regulation strategy, the highest α-ketoglutarate concentration of 37.7 g/L was achieved
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Granulation of Activated Sludge in a Continuous Flow Airlift Reactor by Strong Drag Force
Dandan Zhou,Mengyuan Liu,Jun Wang,Shuangshi Dong,Ning Cui,Linlin Gao 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.2
Most aerobic granule cultivation has been based on the sequencing batch reactor (SBR) and then the factors that affect aerobic granulations were developed in the SBR. However, little work has been done to cultivate aerobic granules in a continuous-flow bioreactor with simple structure that is realistic for engineering. This work is the first to cultivate aerobic granules in a continuous flow airlift fluidized bed reactor (CAFB) possesses a very simple structure and without settling time and starvation time controlling. The configuration of CAFB was the simplest continuous-flow aerobic granular bioreactor reported by now. The majority of granules could be formatted in the CAFB after 12 days cultivation. The effluent COD concentration maintained at 50 ± 10 mg/L for the variable COD loading rate of 3.5 g COD/L/d and 4.8 g COD/L/d, which confirmed that the CAFB performed good anti-shock abilities. CAFB performed good nitrification ability, however, little denitrification was found under the operating conditions of this study. The shear stress acting on the solid phase were hundreds of times stronger in the CAFB than in the SBR at the same aeration strength. It seems CAFB is very efficient for granulation due to the strong shear-force exertion,which is promising for continuous-flow aerobic granular bioreactor. Protein, positive to the hydrophobicity, was predominant in extracellular polymeric substances in the granules, and favored the granules formation in the CAFB combined with the polysaccharides. However, filamentous bulking always happened in 35 days operation of the CAFB, thus further study on the stability of this bioreactor is urgently necessary.
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