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Insights from fund management companies in Vietnam: Evidence from financial reports 越南基金管理公司的见解:来自财务报告的证据
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-12-31 DOI: 10.31130/ud-jst.2022.201e
Nguyen Duc Quang Nguyen
{"title":"Insights from fund management companies in Vietnam: Evidence from financial reports","authors":"Nguyen Duc Quang Nguyen","doi":"10.31130/ud-jst.2022.201e","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.201e","url":null,"abstract":"This paper provides new evidence on fund industry in Vietnam, specifically the profitability and firm characteristics of a company which manages funds. Using hand-collected company information for fund management companies (FMCs), the study shows that FMCs generated a high growth in profitability and revenue from 2014 to 2020. The paper also contributes to the fund management literature by explaining cross-sectional variation in profitability. The research finds that size is the key determinant of FMCs’ profitability, where larger FMCs generate significantly higher profitability. In addition, Vietnamese FMCs have a very high liquidity ratio, a low proportion of fixed assets and a small debt ratio.","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":"125594211","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
An Automatic System for Crop Monitoring and Culture Based on IoRT 基于IoRT的作物监测与栽培自动化系统
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-12-31 DOI: 10.31130/ud-jst.2022.504
Tran Dang Khoa Phan, Van Thanh Vu
{"title":"An Automatic System for Crop Monitoring and Culture Based on IoRT","authors":"Tran Dang Khoa Phan, Van Thanh Vu","doi":"10.31130/ud-jst.2022.504","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.504","url":null,"abstract":"The development of automated farming systems in precision agriculture has been attracting increasing research interest. In this paper, we present an automatic system for crop culture and monitoring based on the Internet of RoboticThings (IoRT). The system includes: an agricultural farming robot with built-in object detection block based on deep learning to locate and classify plant and weed in the image; a device that monitors the parameters of the soil and air environment. The information from the robot and the monitoring device is combined to help the robot determine the right way to take care of the plants. Technical solutions for each component of the system are fully proposed, implemented and evaluated. The experimental results show that the robot is capable of detecting objects with high accuracy; monitoring equipment operates stably; suitable robot design, allowing precise movement of the actuator to any position in the field of view.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"131 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":"124505821","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
An optimization matching approach for digital lending using constraint satisfaction problem models 基于约束满足问题模型的数字借贷优化匹配方法
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-12-31 DOI: 10.31130/ud-jst.2022.528e
Phan Phan, Le Dien Tuan Le, Chau Thi Da Huong Chau
{"title":"An optimization matching approach for digital lending using constraint satisfaction problem models","authors":"Phan Phan, Le Dien Tuan Le, Chau Thi Da Huong Chau","doi":"10.31130/ud-jst.2022.528e","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.528e","url":null,"abstract":"Electronic brokers (e-brokers) in digital lending aim to match borrowers and lenders to conduct transactions via digital platform. The paper proposes a matching model between borrowers and lenders through electronic brokerage after determining interest rate and other requirements. The main contributions of the paper are as follows: (i) Building the framework of matching process through an e-broker;(ii) Building a formula system to calculate borrowers’ satisfaction degree for interest rate and other hard constrains attributes for loans as per lenders’ information; and (iii) building a matching model based on an artificial intelligence method to find the optimal matching solutions between borrowers and lenders to maximize borrowers’ satisfaction degree. The experimental results show that the proposed approach is flexible and effective under the different simulations using constraint satisfaction problem models (CSP).","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"2017 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":"128709807","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
Effect of biodiesel blend ratio derived from rubber seed oil on the fuel consumption when using in the diesel engine without structural modification by simulation and experiment 通过仿真和实验研究了橡胶籽油制备的生物柴油在不进行结构改造的柴油机上使用时，混合比例对油耗的影响
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-12-31 DOI: 10.31130/ud-jst.2022.312e
Nguyen Manh Cuong Nguyen, Huynh Phuoc Son Huynh, Dang Thi Loan Dang
{"title":"Effect of biodiesel blend ratio derived from rubber seed oil on the fuel consumption when using in the diesel engine without structural modification by simulation and experiment","authors":"Nguyen Manh Cuong Nguyen, Huynh Phuoc Son Huynh, Dang Thi Loan Dang","doi":"10.31130/ud-jst.2022.312e","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.312e","url":null,"abstract":"In this study, The model Mazda WL diesel engine,4-cylinder, 4 straight-line cylinder with biodiesel blends ratio of 0%, 15%, 20%, 25%, 30% derived from rubber seed oil and DO has been simulated on ANSYS FLUENT software to analyze fuel consumption characteristics. Experimental engine has been using fuel with diesel (DO) and biodiesel blends (B15, B20, B25, B30) derived from rubber seed oil for a Mazda WL diesel engine installed on Mazda 2500 and Ford Ranger cars. The simulation results show that the average increase in fuel consumption rates for all modes for B15, B20, B25 and B30 compared to DO fuel are 0.71%, 1.69%, 2.77% and 3,83% respectively. Experimental results show that the average increase in fuel consumption rates for all modes for B15, B20, B25 and B30 compared to DO fuel are 0.58%, 1.39%, 2.19% and 3,19% respectively.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"32 8 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":"123802732","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
On the Robust design for IoT-based Wireless Information and Power Transmission network 基于物联网的无线信息与电力传输网络鲁棒性设计研究
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-12-31 DOI: 10.31130/ud-jst.2022.505ict
V. Nguyen-Duy-Nhat, Mai T. P. Le
{"title":"On the Robust design for IoT-based Wireless Information and Power Transmission network","authors":"V. Nguyen-Duy-Nhat, Mai T. P. Le","doi":"10.31130/ud-jst.2022.505ict","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.505ict","url":null,"abstract":"This work investigates the robust beamforming for a multi-antenna internet of things (IoT) system using wireless information and power transmission (WIPT), given that imperfect channel state information (CSI) assumption is accounted.In particular, we investigate the problem of maximizing the worst-case energy harvested, taking into account the quality of service (QoS) constraint of user rate. The proposed problem is naturally a nonconvex problem, which is hard to tackle directly. On one hand, we rely on a classical method, that is semidefinite programming problem (SDP), to handle this by transforming the original nonconvex optimization problem with infinite number of constraints to a relaxed convex one. On the other hand, we propose another algorithm using Symbiotic Organisms Search (SOS) approach that can effciently solve the formulated problem. In the end, numerical results are provided to verify the effectiveness of the SDP-based algorithm in comparison with that of the SOS-based algorithm.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"18 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":"115419845","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 idiosyncratic momentum anomaly: A study of Vietnam stock market 特殊动量异常:对越南股市的研究
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-12-31 DOI: 10.31130/ud-jst.2022.449e
Hoang Van Hai Hoang, TrangKhanh Tran, Pham Van Son Pham
{"title":"The idiosyncratic momentum anomaly: A study of Vietnam stock market","authors":"Hoang Van Hai Hoang, TrangKhanh Tran, Pham Van Son Pham","doi":"10.31130/ud-jst.2022.449e","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.449e","url":null,"abstract":"This paper examines the relationship between idiosyncratic momentum and future returns in the Vietnam stock market. This study utilizes the Vietnam Stock market from the DataStream database, containing listed and delisted stocks from July 2010 to June 2021. Based on the portfolio-level analysis and Fama-Macbeth regressions results, we find that there is a positive and significant relationship between idiosyncratic momentum and future returns. Moreover, these results are robust after controlling for several well-known variables, such as market beta, firm size, book-to-market, and momentum. We also find that the predicted power of idiosyncratic momentum cannot be explained by crash risk, however, idiosyncratic momentum is driven by market states.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"38 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":"123533536","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 of Electromagnetic Shielding for Reduction of Magnetic Fields Generate by Underground Power Cables via a Finite Element Techinique 利用有限元技术研究电磁屏蔽对地下电力电缆磁场的抑制作用
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-12-31 DOI: 10.31130/ud-jst.2022.478ict
Hung Bui Duc, Truong Cong Trinh, M. Q. Duong, V. Dang quoc
{"title":"Study of Electromagnetic Shielding for Reduction of Magnetic Fields Generate by Underground Power Cables via a Finite Element Techinique","authors":"Hung Bui Duc, Truong Cong Trinh, M. Q. Duong, V. Dang quoc","doi":"10.31130/ud-jst.2022.478ict","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.478ict","url":null,"abstract":"Nowadays, with the development of the industries, the electrical types of equipment are used and applied widely for many different purposes. One of them is the use of power cables to transmit electricity over long distances, from generator stations to consumers. Local and global fields are usually created by the extensive presence of the types of currents following in power cables in general and underground cables in particular. Not only causes directly some unwanted effects on the body’s natural equilibrium, but electromagnetic fields can create the disturbance and cause interference with electronic devices. In this paper, a shielding plate is introduced to mitigate the local fields generated by a three phase current of underground power cables. The computation of magnetic fields is implemented with the magnetic vector potential formulations via a finite element technique. The developed method is applied to a practical problem.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"42 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":"132289902","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
Post-traumatic stress disorder among university students in the Vietnam’s fourth COVID-19 wave 越南第四波新冠肺炎疫情中大学生的创伤后应激障碍
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-06-30 DOI: 10.31130/ud-jst.2022.002e
N. Nguyen, Nguyen Tan Thach Nguyen, TrangKhanh Tran, Bui Minh Triet Bui, Ledray Le, Ledray Le, Hoang Thi Nam Giang Le
{"title":"Post-traumatic stress disorder among university students in the Vietnam’s fourth COVID-19 wave","authors":"N. Nguyen, Nguyen Tan Thach Nguyen, TrangKhanh Tran, Bui Minh Triet Bui, Ledray Le, Ledray Le, Hoang Thi Nam Giang Le","doi":"10.31130/ud-jst.2022.002e","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.002e","url":null,"abstract":"Since March 2020, the COVID-19 pandemic has become a global concern, affecting students' mental health. This study aims to explore the prevalence of post-traumatic stress disorder (PTSD), and sleep disturbance among Vietnamese students during the fourth COVID-19 wave. An online survey was performed with a questionnaire based on the Impact of Event Scale-Revised scale (IES-R). A total of 302 students were included in the study, in which there are 11.3% had PTSD. The prevalence of PTSD in female was higher than in male (p=0.006) and students who were fear of vaccine’s side effects had five times higher likelihood of PTSD compared to those who were not (p=0.009). In addition, changes in bedtime and wake-up times were associated with increased odds of PTSD in students (Adjusted Odds Ratios: 3.42, 95% Confidence Intervals: 1.90 to 6.16). The results emphasize the high prevalence of PTSD among students, which could have short- and long-term mental health impacts.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128452456","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
Chemical composition of Triumfetta pseudocana Sparague & Craib, collected in Lamdong, Vietnam 产自越南兰东的伪大闸蟹化学成分分析
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-06-30 DOI: 10.31130/ud-jst.2022.168
L. Le, Nguyen Thi Nguyen
{"title":"Chemical composition of Triumfetta pseudocana Sparague & Craib, collected in Lamdong, Vietnam","authors":"L. Le, Nguyen Thi Nguyen","doi":"10.31130/ud-jst.2022.168","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.168","url":null,"abstract":"Triumfetta pseudocana is a medicinal plant with cool properties. It is used in folk medicine to treat a number of diseases. Currently, there are not many published studies on the biological activity and especially the chemical composition of this plant. In this study, we chose to study the chemical composition from leaves and stems of Triumfetta pseudocana collected in Dalat, Lamdong province, Vietnam in July 2017. By chromatography, four compounds were isolated, include: tiliroside (1), friedelan-3-one (2), 3β-hydroxyfriedelane (3) and triumboidin (4). Their structures were determined by spectroscopic methods (1D and 2D-NMR) and in comparison with the reported data. This is the first time the chemical composition of the species Triumfetta pseudocana has been investigated.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126461984","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
Stability evaluation of a large-scale offshore wind farm integrated into a power system via an HVDC link and an HVAC line 大型海上风电场通过HVDC和HVAC线路并入电力系统的稳定性评估
Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2022-06-30 DOI: 10.31130/ud-jst.2022.249ict
Quang-Son Vo, T. Le
{"title":"Stability evaluation of a large-scale offshore wind farm integrated into a power system via an HVDC link and an HVAC line","authors":"Quang-Son Vo, T. Le","doi":"10.31130/ud-jst.2022.249ict","DOIUrl":"https://doi.org/10.31130/ud-jst.2022.249ict","url":null,"abstract":"Nowadays, offshore wind farms (OWFs) have been increasingly developed in many countries. This paper presents the comparative dynamic-stability evaluation of a large-scale OWF integrated into an onshore multi-machine power system via an HVDC link based on line-commutated converters (LCCs) and a high-voltage alternating current (HVAC) line. Both eigenvalue analysis based on a linearized model and time-domain simulations based on a nonlinear model of the studied system are carried out to compare the damping characteristics contributed by the LCC-HVDC link and the HVAC line. The comparative simulation results show that the LCC-HVDC link can provide better damping characteristics to stabilize the studied large-scale OWF integrated into an onshore multi-machine power system under disturbance conditions, particularly in cases of long-distance.","PeriodicalId":262140,"journal":{"name":"Journal of Science and Technology Issue on Information and Communications Technology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132727180","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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