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Song Zhao,Wei-Dong Tong 대한소화기 기능성질환∙운동학회 2023 Journal of Neurogastroenterology and Motility (JNM Vol.29 No.3
Background/Aims The interstitial cells of Cajal (ICC) are pacemaker cells in the gastrointestinal (GI) tract. We examined whether the activity of ICC could be stimulated to control colonic contractions. An optogenetics-based mouse model in which the light-sensitive protein channelrhodopsin-2 (ChR2) was expressed was used to accomplish cell specific, direct stimulation of ICC. Methods An inducible site-specific Cre-loxP recombination system was used to generate KitCreERT2/+;ROSAChR2(H134R)/tdTomato/+ mice in which ChR2(H134R), a variant of ChR2, was genetically expressed in ICC after tamoxifen administration. Genotyping and immunofluorescence analysis were performed to confirm gene fusion and expression. Isometric force recordings were performed to measure changes in contractions in the colonic muscle strips. Results ChR2 was specifically expressed in Kit-labeled ICC. The isometric force recordings showed that the contractions of the colonic muscle strips changed under 470 nm blue light. Light stimulation evoked premature low-frequency and high amplitude (LFHA) contractions and enhanced the frequency of the LFHA contractions. The light-evoked contractions were blocked by T16Ainh-A01, an antagonist of anoctamin 1 channels that are expressed selectively in ICC in colonic muscles. Conclusions Our study demonstrates a potentially feasible approach to stimulate the activity of ICC by optogenetics. The colonic motor patterns of muscle strips, especially LFHA contractions, can be regulated by 470 nm light via ChR2, which is expressed in ICC.
Dong Xie,Jiexiong Ding,Fumin Liu,Zhong Jiang,Li Du,Wei Wang,Zhiyong Song 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
The complex surface machining quality is related to the capacity of the control system, servo drive and mechanical transmission infive-axis CNC machining. The unsuitable parameters result in surface contour errors and other processing abnormal phenomena such astool marks and corrugated surface. In this paper a twisted ruled surface in flank milling is analyzed. The construction features of surfaceand the tool path characteristic of the specimen are listed. The surface cutting velocity is deduced considering the constraints of the acceleration,jerk and other control parameters and the smoothness is modeled. The individual tracking error acquired from servo feed systemmodel is converted to the contour error by homogeneous transformation matrix and Frenet frame, and abnormal tool marks in flank millingare suggested. The cutting experiments conform to simulation; the effect of the dynamic indicators of the CNC machine tool is exploredby the abnormal marks on the machined parts. This approach provides a support for designing specimens and investigating machinetool dynamics performance in working accuracy test.
THE APPLICATION OF THE ADAPTIVE NOISE ELIMINATOR IN OIL LOGGING
Xu, Song Yuan,Zhou, Wei Dong,Xu, Shao Qing 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
This paper presents the principle of the adaptive noise eliminator, addaptive algorithm, and simulation results. The simulation results display that useful signals can be efficiently extracted from strong noises by the adaptive noise eliminator on the condition that we have little prior knowledge about signal and noises.
A new hybrid method for bearing fault diagnosis based on CEEMDAN and ACPSO-BP neural network
Shanshan Song,Shuqing Zhang,Wei Dong,Xiaowen Zhang,Wei Ma 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.11
As an important part of rotating machinery, the failure of bearings will cause serious vibration and noise of mechanical equipment, which will affect the normal operation of the equipment and even lead to economic losses and casualties. To accurately and efficiently diagnose the working state and fault category of bearings, a new fault diagnosis method for rolling bearings based on the complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN), weighted permutation entropy (WPE) and adaptive chaotic particle swarm optimization back propagation (BP) neural network (ACPSO-BP) was proposed. CEEMDAN and WPE were used to extract fault features and optimize the feature vector by mean domain specification principles. ACPSO optimizes the convergence speed and recognition accuracy of the BP neural network by introducing an adaptive tent mapping interval. The experimental results on bearing data from Western Reserve University and actual wind turbine data show that the proposed diagnosis method can achieve high fault recognition accuracy with a small number of training samples.
Wang, Wei,Bae, Tae-Sung,Park, Yeon Hyun,Kim, Dong Ho,Lee, Sunghun,Min, Guanghui,Lee, Gun-Hwan,Song, Myungkwan,Yun, Jungheum RSC Pub 2014 Nanoscale Vol.6 No.12
<P>A three-dimensional (3D) transparent conducting electrode, consisting of a quasi-periodic array of discrete indium-tin-oxide (ITO) nanoparticles superimposed on a highly conducting oxide-metal-oxide multilayer using ITO and silver oxide (AgOx) as oxide and metal layers, respectively, is synthesized on a polymer substrate and used as an anode in highly flexible organic solar cells (OSCs). The 3D electrode is fabricated using vacuum sputtering sequences to achieve self-assembly of distinct ITO nanoparticles on a continuous ITO-AgOx-ITO multilayer at room-temperature without applying conventional high-temperature vapour-liquid-solid growth, solution-based nanoparticle coating, or complicated nanopatterning techniques. Since the 3D electrode enhances the hole-extraction rate in OSCs owing to its high surface area and low effective series resistance for hole transport, OSCs based on this 3D electrode exhibit a power conversion efficiency that is 11-22% higher than that achievable in OSCs by means of conventional planar ITO film-type electrodes. A record high efficiency of 6.74% can be achieved in a bendable OSC fabricated on a poly(ethylene terephthalate) substrate.</P>
ITGA1 polymorphisms and haplotypes are associated with gastric cancer risk in a Korean population.
Yim, Dong-Hyuk,Zhang, Yan-Wei,Eom, Sang-Yong,Moon, Sun In,Yun, Hyo-Yung,Song, Young-Jin,Youn, Sei-Jin,Hyun, Taisun,Park, Joo-Seung,Kim, Byung Sik,Lee, Jong-Young,Kim, Yong-Dae,Kim, Heon WJG Press 2013 World journal of gastroenterology Vol.19 No.35
<P>To evaluate the association between the genetic polymorphisms and haplotypes of the ITGA1 gene and the risk of gastric cancer.</P>
Cong Chen,Wei Zhong Li,Yongchen Song,Lin Dong Weng,Ning Zhang 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
Molecular dynamics simulations have been performed to investigate hydrogen bonding characteristics of hydroxyl groups in glucose aqueous solutions with different concentrations. The hydrogen bonding abilities and strength of different O and H atom types have been calculated and compared. The acceptor/donor efficiencies have been predicted and it has been found that: (1) O2-HO2 and O3-HO3 are more efficient intramolecular hydrogen bonding acceptors than donors; (2) O1-HO1, O4-HO4 and O6-HO6 are more efficient intramolecular hydrogen bonding donors than acceptors; (5) O1-HO1 and O6-HO6 are more efficient intermolecular hydrogen bonding acceptors than donors while hydroxyl groups O2-HO2 and O4-HO4 are more efficient intermolecular hydrogen bonding donors than acceptors. The hydrogen bonding abilities of hydroxyl groups revealed that: (1) the hydrogen bonding ability of OH2-Hw is larger than that of hydroxyl groups in glucose; (2) among the hydroxyl groups in glucose, the hydrogen bonding ability of O6-HO6 is the largest and the hydrogen bonding ability of O4-HO4 is the smallest; (3) the intermolecular hydrogen bonding ability of O6-HO6 is the largest; (4) the order for intramolecular hydrogen bonding abilities (from large to small) is O2-HO2, O1-HO1, O3-HO3, O6-HO6 and O4-HO4.
Feng, Xiao-Dong,Song, Qi,Li, Chuan-Wei,Chen, Jian,Tang, Hua-Mei,Peng, Zhi-Hai,Wang, Xue-Chun Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.21
Background: Structural maintenance of chromosomes 4 (SMC-4) is a chromosomal ATPase which plays an important role in regulate chromosome assembly and segregation. However, the role of SMC-4 in the incidence of malignancies, especially colorectal cancer is still poorly understood. Materials and Methods: We here used quantitative PCR and Western blot analysis to examine SMC-4 mRNA and protein levels in primary colorectal cancer and paired normal colonic mucosa. SMC-4 clinicopathological significance was assessed by immunohistochemical staining in a tissue microarray (TMA) in which 118 cases of primary colorectal cancer were paired with noncancerous tissue. The biological function of SMC-4 knockdown was measured by CCK8 and plate colony formation assays. Fluorescence detection has been used to detect cell cycling and apoptosis. Results: SMC-4 expression was significantly higher in colorectal cancer and associated with T stage, N stage, AJCC stage and differentiation. Knockdown of SMC-4 expression significantly suppressed the proliferation of cancer cells and degraded its malignant degree. Conclusions: Our clinical and experimental data suggest that SMC-4 may contribute to the progression of colorectal carcinogenesis. Our study provides a new therapeutic target for colorectal cancer treatment.