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Research on Technology of Grid-connected/Islanded Smooth Switchover of Microgrid
Jiguang Xue,Guoning Lu,Feng Di,Xianglei Xu,Dongsheng Yang 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.7
In order to solve the problem of transient oscillation of microgrid during process switching between grid-connected operation and islanded operation, the basic principle of traditional control strategy is analyzed, a novel control structure of smooth switchover for microgrid based on the double negative feedback controller is proposed. Also, to avoid the risk of voltage oscillation caused by the mutual interference of the two controllers in the traditional quasi-synchronization method, an improved quasi-synchronization controller is proposed, which is simpler and easier to implement. Finally, the simulation results verify the validity of the proposed structure. Research results show that the busbar voltage and current oscillation can be solved better with the novel structure, and lay the foundation for smooth switchover.
Jiguang Hou,Dong Ren,Yufeng Chen,Lindan Geng,Shuangquan Yao,Haotian Wu,Pengcheng Wang 대한척추신경외과학회 2023 Neurospine Vol.20 No.1
Objective: This study aimed to examine the effect of the endplate reduction (EPR) technique combined with bone grafting for treating thoracolumbar burst fractures using posterior shortsegmental fixation. Methods: Patients with thoracolumbar fractures admitted between January 2018 and October 2021 were retrospectively analyzed, and those meeting the criteria were assigned to the EPR group and the intermediate screws (IS) group. The vertebral wedge angle (VWA), Cobb angle (CA), anterior vertebral body height (AVBH), middle vertebral body height (MVBH), upper endplate line (UEPL), upper intervertebral angle (UIVA), and upper intervertebral disc height (UIDH) indices were examined and compared preoperatively, first day postoperatively, as well as at 12 months postoperatively. Results: The result indicated that the EPR group achieved better MVBH reduction (p < 0.001), UEPL reduction (p < 0.001), vertebral body fracture healing (p = 0.006), as well as implant breakage (p = 0.04) than the IS group; VWA (p < 0.001), CA (p = 0.005), AVBH (p < 0.001), MVBH (p < 0.001), UEPL (p < 0.001), and UIDH (p < 0.001) were lost after reduction less than those in the IS group. There was no significant difference in operative time (p = 0.315) and intraoperative bleeding (p = 0.274) between the 2 groups. Conclusion: The EPR group achieved better results in repositioning and maintaining MVBH and endplate morphology, with less correction loss after the reduction of the VWA, CA, AVBH, and endplate morphology. The EPR group exhibited a better healing pattern after vertebral fracture and disc degeneration was better relieved.
Analysis and Synthesis of the In-line Slider-Elliptic Crank Dwell Mechanism
Han Jiguang,Zhang Chuanyan,Zuo Weiyang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10
Elliptic crank is a planet mechanism which is able to generate elliptic curve, with elliptic crank as the driven crank of slider-crank mechanism is equal to the mechanism which has a variable length and a variable speed along the elliptical moving crank, which changed the kinematic characteristics of the slider. This paper studies the motion characteristics of the in-line slider- elliptic crank mechanism. A slider mechanism, which has approximate dwell characteristics at the limit position, is proposed. The analysis and synthesis method of the mechanism was presented. The effect on dwell performance of mechanism parameters was analyzed. The adjusting method of the dwell range was put forward. In the end, the design example was given.
Slider Crank Mechanism Design with Time Ratio and Minimum Transmission Angle
Han Jiguang,Zhang Chuanyan,Zuo Weiyang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.11
The size parameters of slider crank mechanism are directly treated as design variable. The analytical synthesis method of the mechanism with time ratio and the selecting range of design variable are presented. The mechanism synthesis method which simultaneously satisfies the conditions of time ratio and minimum transmission angle is presented. The synthesis problem of the slider crank mechanism, which makes it have maximum minimum transmission angle when time ratio is given, is completely solved. This method can not only judge the feasibility of mechanism synthesis, but also determine the parameters of mechanism one time. The ite
Analysis and Synthesis of Geneva Mechanism with Elliptic Crank
Han Jiguang Yu Kang 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8
For both internal and external Geneva mechanism, the kinematics coefficient of the Geneva mechanism is a constant if the groove number of the Geneva wheel is a constant. The elliptic crank using as the drive crank of the Geneva wheel is equal to the mechanism which has a variable length and a variable speed along the elliptical moving crank. Therefore the kinematics coefficient of the Geneva mechanism can be changed. In this paper the analysis method of the combined Geneva mechanism is presented. The synthesis method of the combined Geneva mechanism is put forward based upon the kinematics coefficients. The calculation method of the extreme kinematics coefficient is proposed. In the end, the design example is given.
Spatiotemporal genomic architecture informs precision oncology in glioblastoma
Lee, Jin-Ku,Wang, Jiguang,Sa, Jason K,Ladewig, Erik,Lee, Hae-Ock,Lee, In-Hee,Kang, Hyun Ju,Rosenbloom, Daniel S,Camara, Pablo G,Liu, Zhaoqi,van Nieuwenhuizen, Patrick,Jung, Sang Won,Choi, Seung Won,Ki Nature Pub. Co 2017 Nature genetics Vol.49 No.4
<P>Precision medicine in cancer proposes that genomic characterization of tumors can inform personalized targeted therapies1-5. However, this proposition is complicated by spatial and temporal heterogeneity6-14. Here we study genomic and expression profiles across 127 multisector or longitudinal specimens from 52 individuals with glioblastoma (GBM). Using bulk and single-cell data, we find that samples from the same tumor mass share genomic and expression signatures, whereas geographically separated, multifocal tumors and/or long-term recurrent tumors are seeded from different clones. Chemical screening of patient-derived glioma cells (PDCs) shows that therapeutic response is associated with genetic similarity, and multifocal tumors that are enriched with PIK3CA mutations have a heterogeneous drug-response pattern. We show that targeting truncal events is more efficacious than targeting private events in reducing the tumor burden. In summary, this work demonstrates that evolutionary inference from integrated genomic analysis in multisector biopsies can inform targeted therapeutic interventions for patients with GBM.</P>
Growth and Triterpenic Acid Accumulation of Cyclocarya paliurus Cell Suspension Cultures
Zhongping Yin,Xinchen Shangguan,Jiguang Chen,Qiang Zhao,Dongming Li 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.3
Cyclocarya paliurus is a unique plant growing in central China with hypoglycaemic and hypolipaemia effects. To make better use of this functional food resource,cell suspension cultures and triterpenic acid accumulation were studied. Stable and uniform cell suspension cultures were established in liquid basal Murashige and Skoog medium supplemented with 2,4-dichlorophenoxy acetic acid (0.5 mg/L), naphthalene acetic acid (0.3 mg/L) and cytokinin (1.0 mg/L). According to the growth curve and triterpenic acid accumulation curve, the 8 ~ 10th day postinoculation was the optimum time for subculture, and the 14th day was the optimum time for harvest. Murashige and Skoog medium and woody plant medium were suitable for both cell growth and triterpenic acid accumulation. 3%sucrose (w/v), 60 mM total nitrogen (NO3-/NH4+ = 2/1),1.25 mM KH2PO4, 2 mM CaCl2, and 2 mM MgSO4 were all found to be fit for cell growth and triterpenic acid accumulation in a cell suspension culture of Cyclocarya paliurus. Total triterpenic acid, ursolic acid and oleanolic acid content in suspended cultured cells were all significantly higher than that of leaves and calluses (P 0.01), with levels up to 6.24, 2.28, and 0.94% (of dry weight), respectively. The betulinic acid content of suspended cultured cells also reached 0.82%, which was significantly higher than that of calluses. These results suggest that suspended cultured cells of Cyclocarya paliurus were rich in triterpenic acids and could be used for the production of total triterpenic acid, ursolic acid, oleanolic acid and betulinic acid.