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Improving the Self-adaptive Rate Control to Wireless Multicast for Virtual Environment
Liu Li,Chen Hong-qian,ChenYi,YaoChun-Lian 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.11
Distributed virtual environment requires high stability and low delay to support real-time data transmission for large number of users. In wireless network-based virtual environment, traditional transmission protocol fails to meet the requirements of virtual environment due to variety of nodes distribution, complexity, and difference of bandwidth. Based on our research of rate control for distributed virtual environment, we hereby propose a bandwidth self-adaptive rate control algorithm based on layers of interest. According to effective bandwidth of proxy gateway in distributed virtual environment, this method solving the problem of time inconsistency between publishers and subscribers, constraining occupied bandwidth within the range of effective bandwidth of gateways. Our experiments prove that this algorithm can solve the problem that users’needs of interactive with each other very frequently in wireless network virtual environment. The algorithm automatically match data transmission based on bandwidth and the received datagram is smooth and much more stable. The prime performances meet our expected research objectives.
Hong, Min,Xin, Huanhai,Liu, Weidong,Xu, Qian,Zheng, Taiying,Gan, Deqiang The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.2
The introduction of renewable energy sources into the AC grid can change and weaken the strength of the grid, which will in turn affect the stability and robustness of the doubly-fed induction generator (DFIG) wind farm. When integrated with weak grids, the DFIG wind turbine with vector power control often suffers from poor performance and robustness, while the DFIG wind turbine with synchronized control provides better stability. This paper investigates the critical short circuit ratios of DFIG wind turbine with vector power control and synchronized control, to analyze the stability boundary of the DFIG wind turbine. Frequency domain methods based on sensitivity and complementary sensitivity of transfer matrix are used to investigate the stability boundary conditions. The critical capacity of DFIG wind farm with conventional vector power control at a certain point of common coupling (PCC) is obtained and is further increased by employing synchronized control properly. The stability boundary is validated by electromagnetic transient simulation of an offshore wind farm connected to a real regional grid.
Study on Deformation Behavior at Intersection of Adit and Major Tunnel in Railway
Hong-liang Liu,Shucai Li,Li-Ping Li,Qian-qing Zhang 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
Behavior of rock mass in the intersection between adit and major tunnel is a complicated three-dimensional problem, the increasing support load and additional tunnel deformation may endanger tunnel stability during construction. To understand the deformation behavior of rock mass in the intersection, a 3D numerical analysis was conducted. Comparing the monitoring data, the distribution of the plastic zone, the extrusion displacement of working face and the deformation of the sidewall in the adit and major tunnel were studied. Following analysis results, the distribution and potential influenced area of the intersection in the adit and major tunnel were analyzed. The principle of detection and reinforcement in the intersection were also discussed.
Liu, Mei,Wang, Qian,Geng, Yuanyuan,Wang, Changwei,Lee, Yong-Ill,Hao, Jingcheng,Liu, Hong-Guo American Chemical Society 2014 Langmuir Vol.30 No.34
<P>An aqueous solution of AgNO<SUB>3</SUB> (upper phase) and a DMF/CHCl<SUB>3</SUB> solution of polystyrene-<I>b</I>-poly(acryl acid)-<I>b</I>-polystyrene (PS-<I>b</I>-PAA-<I>b</I>-PS) or PS-<I>b</I>-PAA-<I>b</I>-PS/1,6-diaminohexane (DAH) (lower phase) constituted a planar liquid/liquid interface. The lower phase gradually transformed to a water-in-oil (W/O) emulsion via spontaneous emulsification due to the “ouzo effect”. Polymer molecules, DAH molecules, and Ag<SUP>+</SUP> ions assembled into microcapsules around emulsion droplets that adsorbed at the planar liquid/liquid interface, resulting in formation of a foam film. DAH acted as a cross-linker during this process. Transmission electron microscopic observations indicated that Ag nanoclusters that were generated through reduction of Ag<SUP>+</SUP> ions by DMF were homogeneously dispersed in the walls of the foam structure. X-ray photoelectron spectroscopic investigations revealed that Ag(I) and Ag(0) coexisted in the film, and Ag(I) transformed to Ag(0) after further treatment. The film formed without DAH was not stable, while the film formed with DAH was very stable due to intermolecular attraction between PAA and DAH and formation of amides, as revealed by FTIR spectra. The film formed with DAH exhibited high and durable catalytic activity for hydrogenation of nitro compounds and, very interestingly, exhibited thermoresponsive catalytic behavior.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2014/langd5.2014.30.issue-34/la502738j/production/images/medium/la-2014-02738j_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la502738j'>ACS Electronic Supporting Info</A></P>
Liu Nai-Hua,Liu Hong-Qian,Zheng Jia-Yi,Zhu Meng-Lu,Wu Li-Hao,Pan Hua-Feng,He Xing-Xiang 한국미생물학회 2023 The journal of microbiology Vol.61 No.8
Accumulating studies have raised concerns about gut dysbiosis associating autism spectrum disorder (ASD) and its related symptoms. However, the effect of gut microbiota modification on the Chinese ASD population and its underlying mechanism were still elusive. Herein, we enrolled 24 ASD children to perform the first course of fresh washed microbiota transplantation (WMT), 18 patients decided to participate the second course, 13 of which stayed to participate the third course, and there were 8 patients at the fourth course. Then we evaluated the effects of fresh WMT on these patients and their related symptoms. Our results found that the sleeping disorder symptom was positively interrelated to ASD, fresh WMT significantly alleviated ASD and its sleeping disorder and constipation symptoms. In addition, WMT stably and continuously downregulated Bacteroides/ Flavonifractor/Parasutterella while upregulated Prevotella_9 to decrease toxic metabolic production and improve detoxification by regulating glycolysis/myo-inositol/D-glucuronide/D-glucarate degradation, L-1,2-propanediol degradation, fatty acid β-oxidation. Thus, our results suggested that fresh WMT moderated gut microbiome to improve the behavioral and sleeping disorder symptoms of ASD via decrease toxic metabolic production and improve detoxification. Which thus provides a promising gut ecological strategy for ASD children and its related symptoms treatments.
Hong Ren,Rui Liu,Li Chen,Tianjiao Zhu,Wei Ming Zhu,Qian Qun Gu 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.4
Two new hetero-spirocyclic γ-lactams, azaspirofurans A (1) and B (2), had been isolated from a marine sediment-derived fungus Aspergillus sydowi D2-6. Their structures were determined by the chemical evidence and spectral analyses. Compound 1 exhibited cytotoxicity against A549 cell line with the IC50 value of 10 μM by MTT method.
Hong-juan Zhang,Wei-guo Zhang,Zhi-yuan Wang,Yue-ping Zhan,Li-sheng Xu,Jun-zhong Liu,Qian Liu,Qing-cai Jiao 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.2
In order to investigate the catalytic mechanism of Escherichia coli γ-glutamyltranspeptidase, ten para- and meta- substituted γ-glutamyl anilides were chemically prepared and employed as substrates to synthesize L-theanine to assay the activity of γ-glutamyltranspeptidase. The reaction was optimized for γ-glutamyl-p-nitroanilide. Key factors such as substrate specificity, pH, temperature, and the substrate mole ratio were all investigated. Kinetic studies of the acyl transfer reaction were described and the Hammett plot was constructed. This study indicated that the ratelimiting acylation reaction of γ-glutamyltranspeptidase can apparently be accelerated by either the electron-withdrawing or electron-donating substituents of γ-glutamyl anilides. The reaction could be catalyzed by the general acid and carboxy of Asp-433 or phenolic hydroxyl Tyr-444 may be the acid by autodock simulation for all prepared γ-glutamyl anilides.
RASAL1 Attenuates Gastric Carcinogenesis in Nude Mice by Blocking RAS/ERK Signaling
Chen, Hong,Zhao, Ji-Yi,Qian, Xu-Chen,Cheng, Zheng-Yuan,Liu, Yang,Wang, Zhi Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.3
Recent studies have suggested that the RAS protein activator like-1 (RASAL1) functions as a tumor suppressor in vitro and may play an important role in the development of gastric cancer. However, whether or not RASAL1 suppresses tumor growth in vivo remains to be determined. In the present study, we investigated the role of RASAL1 in gastric carcinogenesis using an in vivo xenograft model. A lentiviral RASAL1 expression vector was constructed and utilized to transfect the human poorly differentiated gastric adenocarcinoma cell line, BGC-823. RASAL1 expression levels were verified by quantitative real-time RT-PCR and Western blotting analysis. Then, we established the nude mice xenograft model using BGC-823 cells either over-expressing RASAL1 or normal. After three weeks, the results showed that the over-expression of RASAL1 led to a significant reduction in both tumor volume and weight compared with the other two control groups. Furthermore, in xenograft tissues the increased expression of RASAL1 in BGC-823 cells caused decreased expression of p-ERK1/2, a downstream moleculein the RAS/RAF/MEK/ERK signal pathway. These findings demonstrated that the over-expression of RASAL1 could inhibit the growth of gastric cancer by inactivation of the RAS/RAF/MEK/ERK pathway in vivo. This study indicates that RASAL1 may attenuate gastric carcinogenesis.