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2,290 results on '"Zhang, Guohua"'

1. Short Regular Girth-8 QC-LDPC Codes From Exponent Matrices with Vertical Symmetry

Author

Zhang, Guohua, Sun, Aijing, Liu, Ling, and Fang, Yi

Subjects
Computer Science - Information Theory
Abstract

To address the challenge of constructing short girth-8 quasi-cyclic (QC) low-density parity-check (LDPC) codes, a novel construction framework based on vertical symmetry (VS) is proposed. Basic properties of the VS structure are presented. With the aid of these properties, existing explicit constructions for column weights from three to five which can be transformed into the VS structure are sorted out. Then two novel explicit constructions with the VS structure which guarantee short codes are presented for column weights of three and six. Moreover, an efficient search-based method is also proposed to find short codes with the VS structure. Compared with the state-of-the-art benchmarks, both the explicit constructions and the search-based method presented in this paper can provide shorter codes for most cases. Simulation results show that the new shorter codes can perform almost the same as or better than the longer existing counterparts. Thus, the new shorter codes can fit better with the low-latency requirement for modern communication systems., Comment: 17 pages, 5 figures; This paper has been accepted by IEEE ISIT2024

Published
2024

2. Factors Influencing Depression and Mental Distress Related to COVID-19 Among University Students in China: Online Cross-sectional Mediation Study

Author

Yu, Yanqiu, She, Rui, Luo, Sitong, Xin, Meiqi, Li, Lijuan, Wang, Suhua, Ma, Le, Tao, Fangbiao, Zhang, Jianxin, Zhao, Junfeng, Li, Liping, Hu, Dongsheng, Zhang, Guohua, Gu, Jing, Lin, Danhua, Wang, Hongmei, Cai, Yong, Wang, Zhaofen, You, Hua, Hu, Guoqing, and Lau, Joseph Tak-Fai

Subjects
Psychology, BF1-990
Abstract

BackgroundThe COVID-19 epidemic may elevate mental distress and depressive symptoms in various populations in China. ObjectiveThis study investigates the levels of depression and mental distress due to COVID-19, and the associations between cognitive, behavioral, and psychosocial factors, and depression and mental distress due to COVID-19 among university students in China. MethodsA large-scale online cross-sectional study (16 cities in 13 provinces) was conducted among university students from February 1 to 10, 2020, in China; 23,863 valid questionnaires were returned. The Patient Health Questionnaire-9 was used to assess depression. Structural equation modeling was performed to test mediation and suppression effects. ResultsOf the 23,863 participants, 47.1% (n=11,235) reported high or very high levels of one or more types of mental distress due to COVID-19; 39.1% (n=9326) showed mild to severe depression. Mental distress due to COVID-19 was positively associated with depression. All but one factor (perceived infection risks, perceived chance of controlling the epidemic, staying at home, contacted people from Wuhan, and perceived discrimination) were significantly associated with mental distress due to COVID-19 and depression. Mental distress due to COVID-19 partially mediated and suppressed the associations between some of the studied factors and depression (effect size of 6.0%-79.5%). ConclusionsBoth mental distress due to COVID-19 and depression were prevalent among university students in China; the former may have increased the prevalence of the latter. The studied cognitive, behavioral, and psychosocial factors related to COVID-19 may directly or indirectly (via mental distress due to COVID-19) affect depression. Interventions to modify such factors may reduce mental distress and depressive symptoms during the COVID-19 epidemic.

Published
2021
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11. Mean topological dimension of induced amenable group actions

Author

Shi, Ruxi and Zhang, Guohua

Subjects
Mathematics - Dynamical Systems
Abstract

In this paper we generalize [BS22, Main Theorem] from actions of a single transformation to amenable group actions, which answers affirmatively the question raised in [BS22] by Burguet and the first-named author of the paper., Comment: 16 pages

Published
2023

12. Effect of prophylactic analgesia with esketamine on postoperative status in patients with thoracolumbar fracture

Author

JI Hongxia*, ZHANG Guohua, ZHANG Bin, CHEN Yonghong

Subjects
thoracolumbar fracture， esketamine， prophylactic analgesia， pain， hemodynamics， stress response, Medicine
Abstract

Objective To explore the effects of prophylactic analgesia with esketamine on pain, hemodynamics, and stress response in patients with single-segment thoracolumbar fracture after percutaneous pedicle screw fixation (PPSF). Methods From April 2021 to April 2023, 85 patients with single-segment thoracolumbar fracture undergoing PPSF at The Sixth People's Hospital of Nantong were enrolled as the research objects. All patients underwent PPSF under tracheal intubation and general anesthesia, routine anesthesia induction, maintenance and patient controlled intravenous analgesia. Among all the patients, 42 cases in obeservation group were given intravenous injection of esketamine (10 mg) at 20 min before the end of the surgery, 43 cases in control group did not receive any other treatment. The postoperative pain ［visual analogue scale (VAS)］, hemodynamics ［heart rate (HR), mean arterial pressure (MAP), oxygen saturation (SpO2), respiratory rate］, stress response ［eosinophils (EOS), platelet count (PLT)］ and adverse reactions were compared between the two groups. Results Compared with control group, obeservation group had higher HR and lower MAP immediately after surgery(T1), lower VAS scores at 2 h (T2) and 6 h (T3) after surgery, and lower frequency of analgesic pump compression at 48h after surgery (P＜0.05). There was no significant difference in SpO2, respiratory rate between two groups (P＞0.05). At T1 and T3, EOS was higher, while PLT was lower in observation group than control group (P＜0.05). There was no statistically significant difference in the incidence of adverse reactions between the observation group and the control group (9.52% vs4.65%, χ2=0.206, P=0.433). Conclusion Prophylactic analgesia with esketamine is beneficial to relieve short-term pain, stress response and stabilize hemodynamics in patients with single-segment thoracolumbar fracture after PPSF, which has few effects on postoperative cognitive function and good safety.

Published
2024
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13. Experimental Analysis on Thermal Performance of Radially Rotating Heat Pipes at Different Filling Ratios

Author

Zhang, Guohua, Li, Guo, Zhang, Yuchen, Huang, Shiyu, Tang, Yuhang, Ceccarelli, Marco, Series Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, Agrawal, Sunil K., Advisory Editor, and Zhou, Kun, editor

Published
2024
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14. Thermal Load Sensitivity Analysis and Mass Reduction Design of Heat Pipe Turbine Disk

Author

Zhang, Yuchen, Li, Guo, Zhang, Guohua, Ding, Shuiting, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, and Fu, Song, editor

Published
2024
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20. Prospective Relationships between College Adjustment, Self-Esteem, and Mental Health Status among Chinese Undergraduates

Author

Zhang, Guohua, Tu, Xiaolian, Ding, Nani, Lau, Joseph T. F., Wang, Pengcheng, and Yang, Xue

Abstract

Objective: This three-wave longitudinal study tested the prospective relationships between college adjustment, self-esteem, and mental health status (ie, subjective well-being, anxiety, and depression). Participants: The study recruited 265 Chinese undergraduate students. Methods: Demographic, college adjustment, self-esteem, and mental health status data were collected. Results: College adjustment and self-esteem were moderate in magnitude and maintained a reasonable stability over time. College adjustment and self-esteem at Year 1 and Year 2, and mental health status at Year 3, were significantly correlated with each other. College adjustment at Year 1 and Year 2, and self-esteem at Year 1 significantly predicted mental health status at Year 3. Conclusions: Interventions to improve self-esteem and college adjustment may benefit long-term mental health outcomes.

Published
2023
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21. Tail variational principle and asymptotic $h$-expansiveness for amenable group actions

Author

Downarowicz, Tomasz and Zhang, Guohua

Subjects
Mathematics - Dynamical Systems
Abstract

In this paper we prove the tail variational principle for actions of countable amenable groups. This allows us to extend some characterizations of asymptotic $h$-expansiveness from $\mathbb{Z}$-actions to actions of countable amenable groups., Comment: to appear in "Israel Journal of Mathematics" (a special volume in honor of Professor Benjamin Weiss)

Published
2022

33. Multiorders in amenable group actions

Author

Downarowicz, Tomasz, Oprocha, Piotr, Więcek, Mateusz, and Zhang, Guohua

Subjects
Mathematics - Dynamical Systems, 37A15, 37A35 (Primary), 43A07 (Secondary)
Abstract

The paper offers a thorough study of multiorders and their applications to measure-preserving actions of countable amenable groups. By a~{\em multiorder} on a~countable group we mean any probability measure $\nu$ on the collection $\tilde{\mathcal{O}}$ of linear orders of type $\mathbb Z$ on $G$, invariant under the natural action of $G$ on such orders. Every free measure-preserving $G$-action $(X,\mu,G)$ has a~multiorder $(\tilde{\mathcal{O}},\nu,G)$ as a factor and has the same orbits as the $\mathbb Z$-action $(X,\mu,S)$, where $S$ is the \emph{successor map} determined by the multiorder factor. Moreover, the sub-sigma-algebra $\Sigma_{\tilde{\mathcal{O}}}$ associated with the multiorder factor is invariant under $S$, which makes the corresponding $\mathbb Z$-action $(\tilde{\mathcal{O}},\nu,\tilde S)$ a factor of $(X,\mu,S)$. We prove that the entropy of any $G$-process generated by a finite partition of $X$, conditional with respect to $\Sigma_{\tilde{\mathcal{O}}}$, is preserved by the orbit equivalence with $(X,\mu,S)$. Furthermore, this entropy can be computed in terms of the so-called random past, by a formula analogous to $ h(\mu,T,\mathcal P)=H(\mu,\mathcal P|\mathcal{P}^-)$ known for $\mathbb Z$-actions. The above fact is then applied to prove a variant of a result by Rudolph and Weiss. The original theorem states that orbit equivalence between free actions of countable amenable groups preserves conditional entropy with respect to a~sub-sigma-algebra $\Sigma$, as soon as the ``orbit change'' is measurable with respect to $\Sigma$. In our variant, we replace the measurability assumption by a~simpler one: $\Sigma$ should be invariant under both actions and the actions on the resulting factor should be free. In conclusion we provide a characterization of the Pinsker sigma-algebra of any $G$-process in terms of an appropriately defined remote past arising from a multiorder., Comment: 36 pages, 2 figures, Changes: slightly changed formulation and proof of Theorem 7.4, some remarks added

Published
2021

42. Activation of the 5-hydroxytryptamine 4 receptor ameliorates tight junction barrier dysfunction in the colon of type 1 diabetic mice

Author

Hu Shasha, Kou Yueting, Liu Xiaochen, Rong Weifang, Han Hongxiu, and Zhang Guohua

Subjects
5-HT4R, diabetes, tight junction barrier, MLCK, ROCK1, Biochemistry, QD415-436, Genetics, QH426-470
Abstract

Hyperglycemia drives dysfunction of the intestinal barrier. 5-Hydroxytryptaine 4 receptor (5-HT4R) agonists have been considered therapeutics for constipation in clnic. However, the roles of 5-HT4R activation in mucosa should be fully realized. Here, we investigate the effects of 5-HT4R activation on diabetes-induced disruption of the tight junction (TJ) barrier in the colon. Not surprisingly, the TJ barrier in diabetic mice with or without 5-HT4R is tremendously destroyed, as indicated by increased serum fluorescein isothiocyanate (FITC)-dextran and decreased transepithelial electrical resistance (TER). Simultaneously, decreased expressions of TJ proteins are shown in both wild-type (WT) and 5-HT4R knockout (KO) mice with diabetes. Notably, chronic treatment with intraperitoneal injection of a 5-HT4R agonist in WT mice with diabetes repairs the TJ barrier and promotes TJ protein expressions, including occludin, claudin-1 and ZO-1, in the colon, whereas a 5-HT4R agonist does not improve TJ barrier function or TJ protein expressions in 5-HT4R KO mice with diabetes. Furthermore, stimulation of 5-HT4R inhibits diabetes-induced upregulation of myosin light chain kinase (MLCK), Rho-associated coiled coil protein kinase 1 (ROCK1), and phosphorylated myosin light chain (p-MLC), which are key molecules that regulate TJ integrity, in the colonic mucosa of WT mice. However, such action induced by a 5-HT4R agonist is not observed in 5-HT4R KO mice with diabetes. These findings indicate that 5-HT4R activation may restore TJ integrity by inhibiting the expressions of MLCK, ROCK1 and p-MLC, improving epithelial barrier function in diabetes.

Published
2023
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