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CEO experience and adjustment speed toward target leverage: The case of Vietnam CEO经验与目标杠杆调整速度:以越南为例
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.071e
Võ Thị Thúy Anh, Thai Thi Thuy An
{"title":"CEO experience and adjustment speed toward target leverage: The case of Vietnam","authors":"Võ Thị Thúy Anh, Thai Thi Thuy An","doi":"10.31130/ud-jst.2023.071e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.071e","url":null,"abstract":"This paper studies the connection between CEO experience and Vietnamese listed firms’ capital adjustment behavior. In the context of Vietnam, we find that experienced CEOs slow down the speed of obtaining the desired ratio of debt, after analyzing a sample of 694 public companies from 2010 to 2019. This pattern can be seen for both under- and over-the-target enterprises when leverage is measured by book and market value. Our findings are in line with other research that shows a negative correlation between CEOs' years of experience and debt levels. We expect that for experienced CEOs, the adjustment benefits are not large enough to substitute for adjustment costs, so they choose not to offset the deviation to the target leverage quicker.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"265 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":"123404114","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 exploration of customer satisfaction model for municipal solid waste collection performance – a case study in Saravane city, Saravane province, Laos 城市生活垃圾收集绩效的顾客满意度模型探索——以老挝萨拉文省萨拉文市为例
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.570e
Le Hoang Son, Lasitthiphon Phudvilai, Pham Thi Ngoc Tho
{"title":"The exploration of customer satisfaction model for municipal solid waste collection performance – a case study in Saravane city, Saravane province, Laos","authors":"Le Hoang Son, Lasitthiphon Phudvilai, Pham Thi Ngoc Tho","doi":"10.31130/ud-jst.2023.570e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.570e","url":null,"abstract":"This study was conducted to assess the customers’ satisfaction level with solid waste collection service in Salavane city, Salavane province, Laos. The interviewed data from 132 households have been tested and analyzed for the correlations between influencing factors and customers’ satisfaction. Through testing Cronbach's alpha coefficient and KMO and Bartlett test, as well as exploratory factor analysis, from 36 observed variables, the authors reduced to 18 significant observed variables. Multivariate regression analysis was applied to build a model to assess the level of satisfaction with solid waste collection services. The results show that “Responsiveness of workers”, “Responsiveness of facility”, and “Reliability” have a great influence on customer's satisfaction.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"18 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":"125549433","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
Barriers affecting the development of logistics systems in Vietnam in the period 2015-2021 2015-2021年期间影响越南物流系统发展的障碍
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.399e
Nguyen Thi Thanh Binh, Le Tram Anh, Tran Thu Thao, Luu Thanh Truc
{"title":"Barriers affecting the development of logistics systems in Vietnam in the period 2015-2021","authors":"Nguyen Thi Thanh Binh, Le Tram Anh, Tran Thu Thao, Luu Thanh Truc","doi":"10.31130/ud-jst.2023.399e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.399e","url":null,"abstract":"The objective of this study is to analyze the barriers that have affected the development of Vietnam's logistics system during the period of 2015-2021 and propose solutions for the future growth of the country's logistics industry. To achieve the above goals, the authors conducted a comprehensive literature review of the barriers to Vietnam's logistics system. We then used content analysis to extract the necessary data for the Interpretive Structural Model (ISM) and the Cross-Impact Matrix Multiplication Applied to Classification method (MICMAC). The research results indicate that barriers related to customs procedures and infrastructure investment capital, and accessibility of logistics enterprises to governmental capital were the most crucial barriers to the development of Vietnam's logistics system from 2015 to 2021.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"477 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":"116380446","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
Developing a teaching model for reading comprehension skills with advertising text 广告文本阅读理解技能教学模式的构建
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.119
Dao Thi Thanh Phuong
{"title":"Developing a teaching model for reading comprehension skills with advertising text","authors":"Dao Thi Thanh Phuong","doi":"10.31130/ud-jst.2023.119","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.119","url":null,"abstract":"A study based on the basic characteristics of language and culture expressed through each element constituting advertising materials, we have come up with a pedagogical model including how to choose, how to prepare lessons, how to build activities, design content and build a system of exercises on this teaching material. Through the teacher's assessment of the pedagogical scenario with a sequence corresponding to the specific language and cultural contents mentioned above, the survey results have shown positive results. Survey results from learners have also demonstrated a change in awareness and progress in the accumulation of communication capacity. The above two survey results affirm the effectiveness and rationality of the teaching model based on advertising text that the goal of this study is to contribute to improve the quality of teaching and learning of the foreign languages by action method.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"239 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":"128146024","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
α-glucosidase inhibitors from the leaves and stems of Erythrina Variegata L. collected in Hanoi 河内市赤藓叶和茎中α-葡萄糖苷酶抑制剂的研究
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.040e
P. Nguyen, Savanchith Xayavong, N. Trinh, D. N. Quang, L. Hoa, Thi-Thuy Do, T. Vu, Thi-Thuc Bui, T. Trinh
{"title":"α-glucosidase inhibitors from the leaves and stems of Erythrina Variegata L. collected in Hanoi","authors":"P. Nguyen, Savanchith Xayavong, N. Trinh, D. N. Quang, L. Hoa, Thi-Thuy Do, T. Vu, Thi-Thuc Bui, T. Trinh","doi":"10.31130/ud-jst.2023.040e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.040e","url":null,"abstract":"Four secondary metabolites, including daidzein (1), genistein (2), glycitein (3), and daidzin (4) have been isolated and structural elucidated from the methanolic extract of the stems and leaves of Erythrina variegata L. collected in Hanoi city, Vietnam. These compounds showed good in vitro inhibition on α-glucosidase enzyme with IC50 values of 97.6 ± 0.6, 230.4 ± 0.4, 34.3 ± 0.9, and 217.2 ± 0.2 µM, respectively as compared with that of acarbose (IC50 value of 125.8 ± 1.2 µM). This finding suggests the possible application of product containing high content of these compounds from the leaves and stems of E. variegata L. for research and development of anti-obese agent.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"7 5 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":"124295888","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
Triterpenoids from Dischidia alboflava whole plant 全株三萜
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.079e
Nguyen Thi Thuy Linh, B. Cham, D. V. Hung, G. T. Kim Lien, T. D. Quan, Trinh Thi Thuy, N. Anh
{"title":"Triterpenoids from Dischidia alboflava whole plant","authors":"Nguyen Thi Thuy Linh, B. Cham, D. V. Hung, G. T. Kim Lien, T. D. Quan, Trinh Thi Thuy, N. Anh","doi":"10.31130/ud-jst.2023.079e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.079e","url":null,"abstract":"In this report, phytochemical constituents of Dischidia alboflava (Asclepiadaceae) collected in Bidoup Nui Ba National Park, Lamdong province, Vietnam were investigated for the first time. The isolation process, as well as structure elucidation, have been supported by modern techniques like chromatographic (TLC, CC) and spectroscopic (ESI MS, 1D and 2D NMR) methods to result six triterpenoids, including β-amirin acetate (1), friedelin (2), 3α-hydroxyglutin-5-en (3), lupeone (4), lupeol (5), and 30-norcyclopterospemol (6). Among these, compounds 3, 4, and 6 have not been recorded to occur in other Dischidia species before. Notably, the identification of compound 6 indicated the presence of cyclotriterpene in Dischidia chemical components, which has not been reported to date.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"158 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":"127159536","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
Geometrically nonlinear bending mesh-free analysis of functionally graded porous sandwich beam 功能梯度多孔夹层梁的几何非线性弯曲无网格分析
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.091e
Tran Quang Hung, T. M. Tu, D. M. Duc
{"title":"Geometrically nonlinear bending mesh-free analysis of functionally graded porous sandwich beam","authors":"Tran Quang Hung, T. M. Tu, D. M. Duc","doi":"10.31130/ud-jst.2023.091e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.091e","url":null,"abstract":"In this work, geometrically nonlinear static bending analysis of sandwich beams with a porous core and two skins made of functionally graded materials using a mesh-free method is presented. The material types of the core and face sheets of the beam are chosen so that the material continuity between the layers is guaranteed. The nonlinear governing equation including geometric nonlinearity is established via the principle of virtual work. This equation is discretized into a system of algebraic equations by the mesh-free approach, which is based on the C1 point interpolation method and polynomial basis functions, and then solved by the direct iterative method. The convergence of the mesh-free method is tested to determine the sufficient mesh level for the analysis. Comparative and comprehensive studies are performed to investigate both the correctness and the influences of several important parameters and boundary conditions on the linear and nonlinear deflections of the beam.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"24 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":"132040140","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
Suffusion prediction model based on physical parameters for gap-graded and well-graded soils 基于物性参数的间隙级配与均匀级配土壤渗流预测模型
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.010e
T. Minh, Ha Anh Duc
{"title":"Suffusion prediction model based on physical parameters for gap-graded and well-graded soils","authors":"T. Minh, Ha Anh Duc","doi":"10.31130/ud-jst.2023.010e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.010e","url":null,"abstract":"Suffusion is one of the four types of internal erosion and accounts for 46% of erosion phenomena in earth dams. Suffusion is an erosion of fine particles inside the soil structure that move out of the voids between coarse particles caused by permeability flow. Identification of internal erosion is necessary to mitigate the loss of humans and property as underground erosion occurs. However, determining suffusion susceptibility in situ is complex and takes a lot of time. This study proposed a fine-grained erosion prediction model based on physical parameters related to the grading curve and the dry density. Using the principal component analysis (PCA) tool evaluated the influence of these parameters on suffusion. The proposed predictive model of the erosion resistance index (ERI) supports stakeholders in quickly determining the extent of erosion and then taking appropriate measures to maintain the earth dams.","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":"128790457","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
Modeling of Synchronous Reluctance Motors by Analytical and Finite Element Approaches for Electric Vehicle Applications 基于解析和有限元方法的电动汽车同步磁阻电机建模
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.085ict
H. B. Duc, Dung Dang Chi, P. Do, V. D. Quoc
{"title":"Modeling of Synchronous Reluctance Motors by Analytical and Finite Element Approaches for Electric Vehicle Applications","authors":"H. B. Duc, Dung Dang Chi, P. Do, V. D. Quoc","doi":"10.31130/ud-jst.2023.085ict","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.085ict","url":null,"abstract":"The design and analysis of synchronous reluctance motor (SynRM) with a distributed type winding is an alternative to replace the permanent magnet synchronous motors (PMSM), which is commonly used in electric vehicle applications. The use of a SynRM eliminates the need for permanent magnets (PMs), reducing the dependence on rare earth materials and potentially lowering costs. In this paper, there are two approaches: a new approach of step-skewing rotor (SSR) is proposed to improve eletromagnetic parameters such as minimization of the active volume, maximization of the output power and reduction of the torque ripple of the SynRM. Then, a finite element technique is developed to analyse and simulate the distribution of magnetic flux and map efficiency of the proposed SynRM. Additionally, the paper has also investigated the distribution of temparature and machnical stress in the region of flux barries of the rotor.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"274 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":"116069282","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
What leads to online review helpfulness on e-commerce platform? Examining the moderating effect of high and low prices 是什么导致电子商务平台上的在线评论有用?考察高、低价格的调节作用
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2023-06-30 DOI: 10.31130/ud-jst.2023.532e
Chu My Giang, Dinh Thi Le Tram, Phan Thi Phu Quyen, N. Thao
{"title":"What leads to online review helpfulness on e-commerce platform? Examining the moderating effect of high and low prices","authors":"Chu My Giang, Dinh Thi Le Tram, Phan Thi Phu Quyen, N. Thao","doi":"10.31130/ud-jst.2023.532e","DOIUrl":"https://doi.org/10.31130/ud-jst.2023.532e","url":null,"abstract":"Using signaling theory, this study unpacked the mechanisms through which online review information quality and reviewer information credibility influence online review helpfulness, in e-commerce context. Conducting a survey with users in Danang having read online reviews on Shopee.vn, 244 valid responses were used to evaluate the research model via PLS-SEM software. The study found that the information quality of online reviews strongly influences the helpfulness of online reviews compared to the information credibility of previous reviewers. Additionally, priced goods have a moderating effect on the relationship between online information credibility and online reviews helpfulness; and that relationship will be significant in high-priced products. This study makes a theoretical contribution to online reviews by elucidating the mechanisms of impact of review/reviewer information on reviews helpfulness and the moderating effect of product prices.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"10 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":"121845951","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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