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Electromechanical Modeling and Simulation of MEMS-Based Piezoelectric Vibration Energy Harvesting Device Using PZT-5H Material 基于PZT-5H材料的mems压电振动能量收集装置的机电建模与仿真
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.340ict
Tuan Ngoc Dao, Phuoc Thanh Quang Le, Tho Quang Than, Son Thanh Nguyen, Tung Thanh Huynh, Phuoc-Anh Le, Than Hong Phuc, Cong-Kha Pham
{"title":"Electromechanical Modeling and Simulation of MEMS-Based Piezoelectric Vibration Energy Harvesting Device Using PZT-5H Material","authors":"Tuan Ngoc Dao, Phuoc Thanh Quang Le, Tho Quang Than, Son Thanh Nguyen, Tung Thanh Huynh, Phuoc-Anh Le, Than Hong Phuc, Cong-Kha Pham","doi":"10.31130/ud-jst.2023.340ict","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.340ict","url":null,"abstract":"In this study, we describe the operation of piezoelectric energy converters and electromechanical modeling of piezoelectric energy harvesting (PEH) devices based on microelectromechanical systems (MEMS) for low-power sensors. Consideration is given to a piezoelectric energy harvester based on standard MEMS. The parameters are determined and optimized using a simple MEMS cantilever model. On top of a Brass substrate, the model uses a single layer of piezoelectric material. We  utilized the finite element method (FEM) models created with software tools NanoHUB and COMSOL to  analyze the electromechanical behavior of MEMS-based piezoelectric energy harvesting (PEH) devices. The electromechanical modeling was applied to predict the modal and harmonic response of the PEH devices. By using a modal analysis, the resonant frequencies are 182 Hz for the FEM models of the PZT-5H PEH device through NanoHUB and COMSOL. The simulated MEMS can provide a voltage between 1.7 and 1.9 mV, 0.074 µW of output power. The produced voltage and output power may be increased by connecting the piezoelectric layers in parallel and series. And the Internet of Things (IoT) sensors might be driven by this array of devices.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"08 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122544797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Control and determination of the kinematic model position of planar parallel mechanism 平面并联机构运动模型位置的控制与确定
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.538e
Vo Dinh Tung, Kheylo Surgey, Rakhilin Konstantin
{"title":"Control and determination of the kinematic model position of planar parallel mechanism","authors":"Vo Dinh Tung, Kheylo Surgey, Rakhilin Konstantin","doi":"10.31130/ud-jst.2023.538e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.538e","url":null,"abstract":"The mechanisms of parallel structure are the subject of many publications due to specific functional properties of these objects, such as load capacity and accuracy This paper offers a solution for the determination of the position and planar parallel two degrees mechanism control. Two problems are solved: the problem of the position of the mechanism and the problem of transition by the executive link of the mechanism through a special position and calculated the motor forces to pass through a special position. There was a proposed and tested control algorithm that offered an example of controlling. The solution for the accuracy position determination for a planar parallel mechanism with two degrees of freedom was offered.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125723174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reliability and validity of scale measuring motorcyclists’ risk perception: The case study of Hanoi, Vietnam 摩托车手风险感知量表的信度与效度:以越南河内市为例
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.444e
Vuong Xuan Can, Mou Rui-fang, Vu Trong Thuat, Nguyen Thi An
{"title":"Reliability and validity of scale measuring motorcyclists’ risk perception: The case study of Hanoi, Vietnam","authors":"Vuong Xuan Can, Mou Rui-fang, Vu Trong Thuat, Nguyen Thi An","doi":"10.31130/ud-jst.2023.444e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.444e","url":null,"abstract":"The purposes of this study are to test and verify a risk perception scale among Vietnamese motorcyclists using Cronbach's Alpha coefficient, Exploratory Factor analysis (EFA), and Confirmatory Factor Analysis (CFA) through a self-reported questionnaire. The risk perception scale is established to measure the risk perception of motorcyclists in Hanoi. The scale consists of 14 items, which are divided into three factors: Worry and Concern, Probability Assessments, and Cognition of Danger level. These factors can explain 71.586% of the variation. The factor loadings of items all meet the requirements of the tests. The risk perception scale has good reliability and validity and can be used to measure the risk perception of Vietnamese motorcyclists. The results of this study can inform the future study of risk perception and risky behaviors of Vietnamese motorcyclists.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131212391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Effects of culture conditions on the growth rate and population size of Apocyclops dengizicus (Arthropoda: Copepoda) 培养条件对登吉沙蚤(节肢动物:桡足动物)生长速率和种群规模的影响
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.172e
T. Mau, Tran-Nguyen Quynh Anh, Le Ba Nguyen Hung
{"title":"Effects of culture conditions on the growth rate and population size of Apocyclops dengizicus (Arthropoda: Copepoda)","authors":"T. Mau, Tran-Nguyen Quynh Anh, Le Ba Nguyen Hung","doi":"10.31130/ud-jst.2023.172e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.172e","url":null,"abstract":"The study aimed to investigate the growth rate and the population size of the copepod Apocyclops dengizicus under different culture conditions of salinity, temperature, and diet. Five salinities, four levels of temperature, and four diet ratios of baker’s yeast and the microalgae were employed for a 20-day experiment. The results showed that A. dengizicus could survive in every experimental concentration of salinity after 20 days of culture, of which the highest growth rate and the largest population size were recorded at a salinity of 15 ppt with values of 0.26 ± 0.01d-1 and 1221 ± 270 individuals, respectively. As for temperature, the A. dengizicus population thrived best at 34°C, with a growth rate reaching 0.29 ± 0.01d-1 and a maximum population size of 2097.0 ± 193.29 individuals obtained at the end of the experiment. Moreover, a diet with 25% Saccharomyces cerevisiae and 75% Chlorella vulgaris showed the best population development (0.25 ± 0.01d-1, 997.5 ± 1 92.09 individuals).","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122099222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the influence of degumming technological parameters on self-dyed silk 脱胶工艺参数对自染真丝影响的研究
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.082e
Tran Nguyen Tu Uyen, Hoang Thanh Thao, B. M. Huong
{"title":"Study on the influence of degumming technological parameters on self-dyed silk","authors":"Tran Nguyen Tu Uyen, Hoang Thanh Thao, B. M. Huong","doi":"10.31130/ud-jst.2023.082e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.082e","url":null,"abstract":"In this study, Marseille soap and Na2CO3 are used for self-dyed silk degumming and evaluated the influence of technological parameters on the degumming efficiency and color intensity of self-dyed silk. Self-dyed silk results from a new dyeing method; this is a green and without-water dye. Its mechanism is based on feeding silkworms with mulberry leaves supplemented by the Rhodamine B dyestuff; colored silk was then treated at different concentrations and time treatment. Xrite color i5 colorimeter, Scanning Electron Microscope (SEM), and Fourier transform infrared spectroscopy (FT-IR) were respectively used to evaluate the color intensity, the treatment efficiency, and the structural characterization of self-dyed silk. The results show that the higher the solution concentration and treatment time, the higher the weight loss ratio and the lower the color intensity. In addition, degumming with Na2CO3 retains the color of silk better than it with Marseille soap. The results are also for reference in selecting the appropriate treatment process for this new material.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134313036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The impact of csr practice on employee engagement and intention to stay in the hotel industry: An ordered logit model approach 企业社会责任实践对酒店行业员工敬业度和逗留意愿的影响:一个有序logit模型方法
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.232e
Pham T. H. Dung, Hoang Thanh Hien, Nguyen Phi Son
{"title":"The impact of csr practice on employee engagement and intention to stay in the hotel industry: An ordered logit model approach","authors":"Pham T. H. Dung, Hoang Thanh Hien, Nguyen Phi Son","doi":"10.31130/ud-jst.2023.232e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.232e","url":null,"abstract":"This study examines the impact of CSR practices on employee work engagement and intention to stay in the hotel industry during the COVID-19 pandemic. It draws on Social Exchange Theory and Stakeholder Theory to analyze the effects of CSR on employee outcomes. The empirical analysis utilizes an ordered logit model and Likert scale data collected from hotel workers. The findings contribute to understanding the role of CSR in attracting and retaining talented employees and building sustainable tourism economies. By employing the ordered logit model, this study provides a robust statistical approach to uncover the relationships between variables. The findings have implications for hotel industry practitioners and policymakers in promoting CSR practices and improving employee engagement and retention.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115740727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Amorphous plasma sprayed coating 非晶等离子喷涂涂层
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.161ict
D. Vũ
{"title":"Amorphous plasma sprayed coating","authors":"D. Vũ","doi":"10.31130/ud-jst.2023.161ict","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.161ict","url":null,"abstract":"The plasma spraying method has wide application in many industries, including the automotive industry, due to its diversity and efficiency. The interest in this technology is increasing as it is possible to replace expensive materials with iron-based alloys and use air instead of inert gas to activate plasma. There are a number of works that have emphasized the importance of properly selected spray parameters, but they used the plasma generation gas, which is an expensive inert gas such as argon, heli, or their gas mixture with a different ratio. The objective of this paper is to study the influence of the most specific parameters that affect the quality of the wear-resistant spray layer using Fe-based powder sprayed onto the steel substrate material. The experiment design with the ANOVA analysis helped to find out the nature of the elevation of the wear resistance under the influence of the particle velocity and the related technological parameters in the process. The research results provide an experimental formula that combines the main spray parameters with the evaluation of wear resistance in relation to the traditional material group.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124766386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Hybrid Model for Probabilistic Analysis of Modern Power Systems with Integration of Renewable Energy Resources 集成可再生能源的现代电力系统混合概率分析模型
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.272ict
Nguyen Thi Ai Nhi, Le Dinh Duong, Ngô Văn Dưỡng, Huynh Van Ky
{"title":"A Hybrid Model for Probabilistic Analysis of Modern Power Systems with Integration of Renewable Energy Resources","authors":"Nguyen Thi Ai Nhi, Le Dinh Duong, Ngô Văn Dưỡng, Huynh Van Ky","doi":"10.31130/ud-jst.2023.272ict","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.272ict","url":null,"abstract":"Modern power systems faces various uncertainties both from conventional sources, due to stochastic nature of both the load and the availability of generation resources and transmission assets, and from renewable resources. The increasing penetration of wind and solar power generation introduces additional uncertainty, causing more difficulties in power system analysis. To deal with uncertainties, Probabilistic Power Flow (PPF) has been introduced as an efficient tool. In this paper, we develop a hybrid model that combines scenario analysis technique and cumulant based PPF approach. It can take into account various sources of uncertainty in the power system and their correlations. The proposed approach is performed on IEEE-118 bus test system, indicating good performance in comparison with Monte Carlo approach.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116022725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Solving optimization problems in emergency evacuation 解决应急疏散中的优化问题
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.118ict
D. T. Huyen, Hoang Ha, M. Occello
{"title":"Solving optimization problems in emergency evacuation","authors":"D. T. Huyen, Hoang Ha, M. Occello","doi":"10.31130/ud-jst.2023.118ict","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.118ict","url":null,"abstract":"In this paper, we propose a method to solve the optimization problem in an emergency evacuation. Specifically, when passengers are waiting for their flight in the lounge and a fire breaks out. How to evacuate all passengers to a safe place with the minimum total evacuation time? To solve the problem, we propose a method based on the multi-agent multi-level model MAS-GiG [1], combined with the shortest path algorithm to guide passengers to evacuate to a safe place. Additionally, we address issues that arise during the evacuation process, such as reducing the speed of groups when two or more groups collide, and changing the evacuation plan when the routes to the exit are blocked. We compare the proposed method with the method in [2] to provide specific evaluations and future research directions. The testing environment is the departure hall, 1st floor of Danang International Airport.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130628727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Political connections, corruption and access to credit in Vietnamese SMEs 越南中小企业的政治关系、腐败和信贷渠道
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-12-31 DOI: 10.31130/ud-jst.2022.311e
Phuoc Vu Ha Phuoc, Kim Yen Le Kim
{"title":"Political connections, corruption and access to credit in Vietnamese SMEs","authors":"Phuoc Vu Ha Phuoc, Kim Yen Le Kim","doi":"10.31130/ud-jst.2022.311e","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.311e","url":null,"abstract":"The observation of firms’ political connections (PCs) and corruption has raised the question of their benefits to firms’ operation, especially on accessing to the financial resources. Firms with stronger political connections or informal payment willingness may get easier in approaching to formal bank loans. By using different types of PCs and bribe, the study shows that while PCs can help SMEs in getting formal bank loans, bribe does not have any effect on firms’ access to credit. The PCs can be known as the social capital, which helps the firm in accessing the resources. The paper gives a better understanding about the characteristics of SMEs in an emerging market and a network-oriented country like Vietnam.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128863035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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