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Optimal Design of Smart Panel Using Admittance Analysis
Lijie Zhao,Heung Soo Kim,Jaehwan Kim 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.4
Optimal configuration of piezoelectric shunt structures is obtained by analyzing admittance of the system. The dissipated energy in the shunt circuit is a function of admittance. Therefore, admittance was selected as the cost function in the process of optimization. Taguchi method was used to determine the optimal configuration of piezoceramic patch bonded on the host structure. Full three dimensional finite element models were analyzed to simulate vibration modes of smart panel and to obtain the admittances of the system. Numerical admittance was validated by experiment. After optimizing process using admittance, the optimal configuration of piezoceramic patch was obtained. It is observed that the performance of smart panel can be predicted by analyzing admittance of piezoelectric structure and admittance can be used as a design index of smart panel.
Lijie Zhao,Rong Geng,Yi Huang,Jiping Zhang,Haiying Cheng,Cankun Zhou,Yifeng Wang 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.5
Objective: As a gate-keeper enzyme link, pyruvate dehydrogenase E1 subunit alpha (PDHA1) functions as a key regulator during glycolysis and the mitochondrial citric acid cycle, which has been reported in several tumors. Nevertheless, the effects of PDHA1 on biological behaviors and metabolism remain unclear in cervical cancer (CC) cells. The study aims to explore the PDHA1 effects on glucose metabolism in CC cells and its possible mechanism. Methods: We first determined the expression levels of PDHA1 and activating protein 2 alpha (AP2α) as a PDHA1 potential transcription factor. The effects of PDHA1 in vivo were evaluated through a subcutaneous xenograft mouse model. Cell Counting Kit-8 assay, 5-ethynyl-2′-deoxyuridine (EdU) labeling assay, Transwell invasion assay, wound healing assay, Terminal deoxynucleotidyl transferase dUTP nick end labeling assay and flow cytometry were performed in CC cells. Oxygen consumption rate (OCR) levels were determined to reflect aerobic glycolysis level in gastric cancer cells. Reactive oxygen species (ROS) level was measured with 2′, 7′-dichlorofluorescein diacetate kit. The relationship between PDHA1 and AP2α was examined by conducting chromatin immunoprecipitation assay and electrophoretic mobility shift assay. Results: In CC tissues and cell lines, PDHA1 was downregulated, while AP2α was upregulated. Overexpression of PDHA1 remarkedly inhibited the proliferation, invasion and migration of CC cells, and tumor growth in vivo, as well as promoted OCR, apoptosis and ROS production. Moreover, AP2α directly bound to PDHA1 within suppressor of cytokine signaling 3 promoter region to negatively regulate PDHA1 expression level. What is more, PDHA1 knockdown could effectively reversed the AP2α silencing-mediated suppressive effects on cell proliferation, invasion, migration, and the promotive effects of AP2α knockdown on OCR, apoptosis and ROS production. Conclusions: Our findings demonstrate that AP2α negatively regulated PDHA1 via binding to PDHA1 gene promoter to promote malignant CC cell behaviors, which may provide a potential approach for CC therapeutics.
Study on Transmission Loss in Smart Panel Using Admittance
김재환(Zhao, Lijie),김흥수(Kim, Jae-Hwan) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.11
In this paper, transmission loss of smart panel was investigated using piezoelectric shunt damping. Admittance of piezoelectric system was introduced to represent electro-mechanical coupling of smart panel and to predict the performance of shunt damping. Finite element method was used to obtain numerical admittance. In order to illuminate the effect of noise reduction in the shunt system, transmission loss of the smart panel was investigated. Two models were considered to show the relation between admittance and transmission loss of smart panel. It was observed that admittance of piezoelectric system could be used as a design index of smart panel.
Research and Optimization of Lateral Compressive Performance of the 3-D Printed Beetle Elytron Plate
Caiqi Zhao,Tengteng Zheng,Lijie Shang,Haitao Lan,Shuo Yang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8
In this paper, two types of beetle elytron plates (end-trabecular beetle elytron plate (EBEP) and middle-trabecular beetle elytron plate (MBEP)) and honeycomb plate (HP) were manufactured by 3-D printed and applied to large-span spatial structure. The lateral compressive performance of the 3-D printed beetle elytron plate was investigated by lateral compression bearing capacity test and numerical analysis. The influence of number of cylinders, ratio of the radius of the cylinder to the side length of the hexagonal honeycomb core (ratio of radius-length), thickness of core layer and configuration of beetle elytron plate on the lateral compressive performance of the beetle elytron plates were studied and the optimization method for lateral compressive performance of the beetle elytron plates was proposed. The result shows that the lateral compression bearing capacity of EBEP is greater than that of MBEP, and both are greater than of HP. The lateral compression bearing capacity of the beetle elytron plate with six cylinders is about 25% higher than that of the HP without cylinders. The lateral compression bearing capacity of beetle elytron plate can be improved by increasing the thickness of plates. The results of the study will promote the application of beetle elytron plates in large-span spatial structures.
( Cheng Wu ),( Lijie Liu ),( Peng Zhao ),( Dan Tang ),( Dingkang Yao ),( Liang Zhu ),( Zhiqiang Wang ) 대한소화기학회 2015 Gut and Liver Vol.9 No.5
Background/Aims: To screen for serum protein/peptide biomarkers of hepatitis B virus (HBV)-associated chronic hepatic lesions in an attempt to profile the progression of HBV-associated chronic hepatic lesions using surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF MS) techniques. Methods: Using SELDI-TOF MS, serum protein/peptide profiles on the CM10 ProteinChip arrays were obtained from a training group including 26 HBV-associated hepatocellular carcinoma patients with liver cirrhosis (LC), 30 HBV-associated LC patients, 85 patients at different stages of liver fibrosis, and 30 asymptomatic HBV carriers. The most valuable SELDI peak for predicting the progression to LC in HBV-infected patients was identified. Results: A SELDI peak of M/Z 5805 with value for predicting LC in HBV-infected patients was found and was identified as a peptide of the C-terminal fraction of the fibrinogen a-chain precursor, isoform 1. Conclusions: The peptide of the C-terminal fraction of the fibrinogen α-chain precursor, isoform 1 with M/Z 5805, may be a serological biomarker for progression to LC in HBV-infected patients. (Gut Liver 2015;9:665-671)
Progressive Collapse Resistance Analysis of Plate-member Composite Reticulated Shell Structure
Tengteng Zheng,Caiqi Zhao,Yun Xu,Zekun Fan,Haitao Lan,Lijie Shang 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.8
In order to study the progressive collapse resistance of plate-member composite reticulated shell structure and propose an applicable analysis method, the complete and member removal experimental models of composite reticulated shell structure were designed by Alternate Path (AP) analysis method, and the progressive collapse resistance test and numerical analysis were carried out. The results show that the honeycomb plate contributes greatly to the bearing capacity of the composite structure, the ultimate bearing capacity of member removal structure is 3.64% smaller than that of the complete structure, and the ultimate displacement is 30% smaller. The average error of load-displacement curves between the progressive collapse resistance test and numerical analysis is less than 10% in the elastic stage, and the overall failure mode of the numerical analysis model and the experimental model is consistent. The anti-progressive collapse analysis method based on modal sensitivity is suitable for the plate-member composite reticulated shell structure due to high computational efficiency and accuracy, which provides a reference for progressive collapse resistance analysis of plate-member composite reticulated shell structure.
A Novel Technique for Dressing Fixed Abrasive Lapping Pad with Abrasive Water Jet
Zhankui Wang,Yakun Yang,Zhao Zhang,Minghua Pang,Mingchao Liang,Lijie Ma,Jianxiu Su 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.6
The dressing method and dressing quality of the fixed abrasive lapping pad significantly impact the processing efficiency and surface quality of the workpiece material. Aiming at the problems of poor dressing effect and high damage degree of the lapping pad in the existing fixed abrasive dressing technology, a new technology using abrasive water jet for dressing is proposed. The self-developed abrasive water jet system was used to conduct a dressing test on a fixed abrasive lapping pad with a copper content of 30%. The influence of jet pressure, nozzle target distance, abrasive concentration and injection angle on the dressing effect were discussed, and the influence mechanism was analyzed by discrete element simulation. The results show that the dressing effect of the abrasive water jet is good. The dressing quality first increases and then decreases with the increase of jet pressure, nozzle target distance and injection angle, and increases with the increase of abrasive concentration. The influence mechanism of each parameter is closely related to the residual height of the lapping pad surface after dressing. The higher the residual height, the rougher the lapping pad surface, and the better the dressing effect of the lapping pad.