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( Lei Zhang ),( Ji T Gong ),( Hu Q Zhang ),( Quan H Song ),( Guang H Xu ),( Lei Cai ),( Xiao D Tang ),( Hai F Zhang ),( Fang E Liu ),( Zhan S Jia ),( Hong W Zhang ) 대한소화기기능성질환·운동학회 2015 Journal of Neurogastroenterology and Motility (JNM Vol.21 No.2
Background/Aims There are increasing evidences for gastrointestinal motility disorder (GIMD) and gastric stress ulcer induced by noise stress. The present study was to investigate the reversed effect of melatonin on GIMD and gastric stress ulcer induced by noise stress and potential mechanism. Methods Noise stress was induced on rats, and melatonin (15 mg/kg) was administered to rats by intraperitoneal injection. Differences were assessed in gastric residual rate (GRR), small intestine propulsion rate (SPR), Guth injury score, cortisol, gastrointestinal hormones (calcitonin-gene-related peptide and motilin) and oxidative stress markers (superoxide dismutase and malondialde hyde) in blood plasma as well as gastric mucosa homogenate with or without melatonin. The pathological examination of gastric mucosa was also performed. Results The GRR and SPR were improved by noise stress compared with control (P < 0.05). The pathological examination and Guth injury score revealed gastric stress ulcer. Moreover, the levels of cortisol, motilin and malondialdehyde in blood plasma and malondialdehyde in gastric mucosa homogenate were increased by noise stress (P < 0.05). CGRP and superoxide dismutase activity in both of blood plasma and gastric mucosa homogenate were significantly decreased (P< 0.05). Furthermore, melatonin reversed changes in GRR, SPR, pathological examination, Guth injury score, cortisol, motilin, CGRP, superoxide dismutase activity and malondialdehyde (P < 0.05). Conclusions Melatonin is effective in reversing the GIMD and gastric stress ulcer induced by noise stress. The underlying mechanism may be involved in oxidative stress and gastrointestinal hormones. (J Neurogastroenterol Motil 2015;21:189-199)
Lei Ji,Mingquan Wei,Dunyan Yan 대한수학회 2024 대한수학회보 Vol.61 No.4
In this paper, we study the boundedness of the commutator $H_\Omega^b$ formed by the rough Hardy operator $H_\Omega$ and a locally integrable function $b$ from homogeneous Herz spaces to homogeneous weak Herz spaces. In addition, the weak boundedness of $H_\Omega^b$ on central Morrey spaces is also established.
노인 복지시설 스포츠 프로그램 참여동기와 여가만족의 관계
희뢰(Ji, Lei),진용(Chen, Yong),주관인(Zhu, Guan-Ren) 대한고령친화산업학회 2020 대한고령친화산업학회지 Vol.12 No.2
연구목적 : 본 연구는 노인 복지시설의 체육프로그램을 이용하는 노인들의 속성인 참여동기를 파악하여 여가시간의 활용을 통한 만족을 높이고자 하였다. 연구방법 : 수도권 노인 복지시설의 체육프로그램 참여자를 대상으로 설문지를 사용하였으며 수집된 자료는 SPSS 24.0을 사용하여 참여동기와 여가만족의 관계를 규명하였다. 연구결과 : 여가만족의 신체적 만족에는 건강동기가 영향을 미쳤고, 환경적 만족에는 건강, 즐거움 동기, 사회적 만족에는 즐거움 동기가 영향을 미친 것으로 나타났다. 결론 : 노인 복지시설의 체육프로그램과 여가만족의 관계가 확인되어 도출된 결과를 바탕으로 체육프로그램의 개선을 통한 참여확대와 만족감 증진이 필요하다. Objective : The purpose of this study was to increase satisfaction through the use of leisure time by identifying the motivation for the participation of seniors who participate sports programs in senior welfare center. Methods : Questionnaires were used for participants in a sports program at senior welfare center in the Seoul metropolitan area, and the collected data was analyzed by SPSS 24.0 to identify the relationship between motivation for participation and leisure satisfaction. Results : It has been shown that the physical satisfaction of leisure was influenced by health motivation, and the environmental satisfaction was influenced by health, pleasure motivation, and social satisfaction. Conclusion : Based on the results obtained after confirming the relationship between sports programs and leisure activities of welfare facilities for the elderly, it is necessary to expand participation and enhance satisfaction through the improvement of sports programs.
Qing-Lei Zeng,Bin Yang,Hong-Qi Sun,Guo-Hua Feng,Lei Jin,Zheng-Sheng Zou,Zheng Zhang,Ji-Yuan Zhang,Fu-Sheng Wang 한국분자세포생물학회 2014 Molecules and cells Vol.37 No.1
Myeloid-derived suppressor cells (MDSCs) play an important role in impairing the function of T cells. We characterized MDSCs in two chronic hepatitis C (CHC) cohorts: a cross-sectional group that included 61 treatment-naive patients with CHC, 14 rapid virologic response (RVR) cases and 22 early virologic response (EVR) cases; and a longitudinal group of 13 cases of RVR and 10 cases of EVR after pegylated-interferon-α/ribavirin treatment for genotype 1b HCV infection. Liver samples from 32 CHC patients and six healthy controls were subjected to immunohistochemical analysis. MDSCs frequency in treatmentnaive CHC was significantly higher than in RVR, EVR, or healthy subjects and was positively correlated with HCV RNA. Patients infected with HCV genotype 2a had a significantly higher frequency of MDSCs than those infected with genotype 1b. Decreased T cell receptor (TCR) ζ expression on CD8+ T cells was significantly associated with an increased frequency of MDSCs in treatment-naive CHC patients and was restored by L-arginine treatment in vitro. Increased numbers of liver arginase-1+ cells were closely associated with the histological activity index in CHC. The TCR ζ chain was significantly downregulated on hepatic CD8+ T cells in CHC. During antiviral follow up, MDSCs frequency in peripheral blood mononuclear cells was directly correlated with the HCV RNA load in the plasma and inversely correlated with TCR ζ chain expression in CD8+ T cells in both RVR and EVR cases. Notably, the RVR group had a higher frequency of MDSCs at baseline than the EVR group. Collectively, this study provides evidence that MDSCs might be associated with HCV persistence and downregulation of CD8 ζ chain expression.
Zeng, Qing-Lei,Yang, Bin,Sun, Hong-Qi,Feng, Guo-Hua,Jin, Lei,Zou, Zheng-Sheng,Zhang, Zheng,Zhang, Ji-Yuan,Wang, Fu-Sheng Korean Society for Molecular and Cellular Biology 2014 Molecules and cells Vol.37 No.1
Myeloid-derived suppressor cells (MDSCs) play an important role in impairing the function of T cells. We characterized MDSCs in two chronic hepatitis C (CHC) cohorts: a cross-sectional group that included 61 treatment-naive patients with CHC, 14 rapid virologic response (RVR) cases and 22 early virologic response (EVR) cases; and a longitudinal group of 13 cases of RVR and 10 cases of EVR after pegylated-interferon-${\alpha}$/ribavirin treatment for genotype 1b HCV infection. Liver samples from 32 CHC patients and six healthy controls were subjected to immunohistochemical analysis. MDSCs frequency in treatment-naive CHC was significantly higher than in RVR, EVR, or healthy subjects and was positively correlated with HCV RNA. Patients infected with HCV genotype 2a had a significantly higher frequency of MDSCs than those infected with genotype 1b. Decreased T cell receptor (TCR) ${\zeta}$ expression on $CD8^+$ T cells was significantly associated with an increased frequency of MDSCs in treatment-naive CHC patients and was restored by L-arginine treatment in vitro. Increased numbers of liver arginase-$1^+$ cells were closely associated with the histological activity index in CHC. The TCR ${\zeta}$ chain was significantly downregulated on hepatic $CD8^+$ T cells in CHC. During antiviral follow up, MDSCs frequency in peripheral blood mononuclear cells was directly correlated with the HCV RNA load in the plasma and inversely correlated with TCR ${\zeta}$ chain expression in $CD8^+$ T cells in both RVR and EVR cases. Notably, the RVR group had a higher frequency of MDSCs at baseline than the EVR group. Collectively, this study provides evidence that MDSCs might be associated with HCV persistence and downregulation of CD8 ${\zeta}$ chain expression.
Lei Wang,YiPing Luo,Hui Ying Liang,Meng Ji 한국자기학회 2019 Journal of Magnetics Vol.24 No.4
In order to study the temperature characteristics of magnetorheological fluid dynamometer, the torque model and working principle of magnetorheological fluid dynamometer were analyzed, the temperature experiment of magnetorheological fluid dynamometer was conducted, and the experimental data were analyzed and processed in this paper. The fitting curves between the speed of magnetorheological fluid dynamometer and the experimental temperature, the speed and the torque, the current and the torque as well as the current and the temperature were obtained. Then, the temperature field of magnetorheological fluid was simulated by FLUENT based on the experimental data. The temperature field nephograms and temperature values of test points under different working conditions were obtained. Comparing the experimental values with the simulation values, the relative error was less than 7.8 %, which was within a reasonable range. Finally, from the aspect of temperature reduction, the simulation model was optimized. Based on the principle of heat convection, the simulation model was reconstructed. The maximum temperature drop was 10℃.
Seismic behavior of cross-shaped concrete-filled steel tubular columns
Ji-Cheng Zhang,Xiao-Yu Liu,Lei Zeng,Guo-Feng Du,Jia-Hao Xiao 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.40 No.3
This paper experimentally investigated the behavior of a cross-shaped concrete-filled steel tubular (C-CFST) column subjected to a constant axial load and a low-cycle repeated loading. Nine C-CFST columns with different length-width ratio, width-thickness ratio and axial compression ratio were designed, and the failure mode, hysteresis curve, skeleton curve, ductility, stiffness degradation and energy dissipation capacity of each specimen were studied and analyzed. The results indicated that the cross-shaped steel tube had a strong restraining effect on the core concrete, and C-CFST columns of different sectional dimensions all exhibited favorable seismic behavior, which is suitable for middle-high residential buildings. An increase of length-width ratio enhanced the initial stiffness with a decrease of ductility, and more rapid stiffness degradation during loading. Specimens with smaller width-thickness ratios had higher ductility, stiffness, and energy dissipation capacity. A larger axial compression ratio could reduce the bearing capacity, and cause the stiffness to degrade faster. Moreover, a hysteretic model of C-CFST columns was also proposed based on an analysis of the test results.
Preparation and Properties of Alginate/Polyaspartate Composite Hydrogels
Lei, Jing,Kim, Ji-Heung,Jeon, Young-Sil The Polymer Society of Korea 2008 Macromolecular Research Vol.16 No.1
This study examined the swelling behavior and in vitro release of a model drug, tetracycline-HCl, from alginate and alginate-polyaspartate (Alg-PASP) composite gel beads. The alginate and Alg-PASP composite beads were prepared using an ionic crosslinking method with aqueous $Ca^{2+}$. Their microporous morphology was observed by scanning electron microscopy. The swelling ratio of the beads in different media varied according to their composition, cross-linking density ($Ca^{2+}$ concentration), and pH of the aqueous medium. The in vitro release experiment of the tetracycline-HCl encapsulated beads in different media suggests that the release of the drug is governed mainly by the swelling properties of the polymer network. The presence of PASP was found to significantly influence the swelling properties and drug release profile.