Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4887
None TRAN THI THU THUY
Over the past decade, the population of Ho Chi Minh City (HCMC) has doubled, resulting in a rise in low-income hostels. Rental homes for low-income families are usually small, ranging from 12 to 15 square meters, serving as a multi-purpose space. This type of accommodation is the most suitable option for those who cannot afford larger housing. This article aims to assess the effect of ventilation-related renovations on indoor air quality through a case study of a rental house in HCMC. Fieldwork was conducted to collect information on the house's original state, followed by renovations. Air pollutants, such as CO2, CO, PM2.5, and TVOC, were measured before and after renovation. Further analysis was conducted to identify factors that could enhance ventilation conditions in the house. The findings indicated that using exhaust fans with louvers and frequently opening doors and windows significantly improved indoor air quality. Therefore, mechanical ventilation is a simple and effective intervention to improve indoor air quality in tiny homes, especially near areas where residents sleep and have at least one motorbike.
{"title":"REVAMPING FOR BETTER INDOOR AIR QUALITY IN HOUSING: A RENTAL HOUSE RENOVATION IN HO CHI MINH CITY, VIETNAM","authors":"None TRAN THI THU THUY","doi":"10.46242/jstiuh.v64i04.4887","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4887","url":null,"abstract":"Over the past decade, the population of Ho Chi Minh City (HCMC) has doubled, resulting in a rise in low-income hostels. Rental homes for low-income families are usually small, ranging from 12 to 15 square meters, serving as a multi-purpose space. This type of accommodation is the most suitable option for those who cannot afford larger housing. This article aims to assess the effect of ventilation-related renovations on indoor air quality through a case study of a rental house in HCMC. Fieldwork was conducted to collect information on the house's original state, followed by renovations. Air pollutants, such as CO2, CO, PM2.5, and TVOC, were measured before and after renovation. Further analysis was conducted to identify factors that could enhance ventilation conditions in the house. The findings indicated that using exhaust fans with louvers and frequently opening doors and windows significantly improved indoor air quality. Therefore, mechanical ventilation is a simple and effective intervention to improve indoor air quality in tiny homes, especially near areas where residents sleep and have at least one motorbike.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487003","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}
Using the Systematic Quantitative Literature Review method, this paper reviewed the literature related to engineering students’ self-efficacy in higher education from 2010 to 2020 to evaluate the existing research and suggest directions for future work. One hundred and thirty-five articles were selected for the review of the most popular research topics and four patterns of the distribution of studies, namely countries, methods, and study samples. The most popular research topics worldwide were learning performance and self-efficacy, self-efficacy and gender/race, preservice teachers’ self-efficacy, and self-efficacy and entrepreneurship. Few articles investigated engineering students’ self-efficacy in English language learning, online learning, or E-learning in the last decade. Most reviewed studies were either conducted in the USA or high-income countries and administered in single research settings. Quantitative methods outnumbered qualitative or mixed-method research. Undergraduates were the most researched participants, followed by a mix of graduates and postgraduates. The review includes only articles but not presentation papers, dissertations, and book chapters, thereby reducing the coverage of the existing research on engineering students’ self-efficacy in higher education.
{"title":"ENGINEERING STUDENTS’ SELF-EFFICACY IN HIGHER EDUCATION: A REVIEW OF THE LITERATURE","authors":"None NGA THI TUYET PHAN, None SHIH-HSIEN CHANG, None CHENG-HU CHEN","doi":"10.46242/jstiuh.v64i04.4894","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4894","url":null,"abstract":"Using the Systematic Quantitative Literature Review method, this paper reviewed the literature related to engineering students’ self-efficacy in higher education from 2010 to 2020 to evaluate the existing research and suggest directions for future work. One hundred and thirty-five articles were selected for the review of the most popular research topics and four patterns of the distribution of studies, namely countries, methods, and study samples. The most popular research topics worldwide were learning performance and self-efficacy, self-efficacy and gender/race, preservice teachers’ self-efficacy, and self-efficacy and entrepreneurship. Few articles investigated engineering students’ self-efficacy in English language learning, online learning, or E-learning in the last decade. Most reviewed studies were either conducted in the USA or high-income countries and administered in single research settings. Quantitative methods outnumbered qualitative or mixed-method research. Undergraduates were the most researched participants, followed by a mix of graduates and postgraduates. The review includes only articles but not presentation papers, dissertations, and book chapters, thereby reducing the coverage of the existing research on engineering students’ self-efficacy in higher education.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487004","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}
Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4896
None NGA THI TUYET PHAN*, None HO THI HIEN, None DO NGOC CAM TU, None HO VAN THAI
The potential of virtual exchange (VE) to improve oral communication skills of learners in non-English speaking countries has not been acknowledged in the literature. However, despite the expansion of VE programs for on-demand language practices in mainstream foreign language education and the growing number of research into VE worldwide, the potential of VE has not been recognized in Vietnam. This study explored the effects of VE on the speaking skills of non-English majors at a Vietnamese technical university. It used a survey with Likert-type options, interviews, and students' language samples to examine both the perceived and actual impact of VE. The findings show that all participants believed in the encouraging effects of VE on students' debate skills, idea exchanges, learning process, sense of improvement and achievement, confidence, interaction, and speaking motivation. Five elements of speaking skills, namely Grammar, Vocabulary, Pronunciation, Fluency, and Discourse Management, were improved, with Discourse Management showing the most progress and Grammar showing the least. Linguistic analysis indicates that student participants actually made progress in their oral communication skills. However, improvement varied depending on the topic, with participants showing more improvement in familiar or easy speaking activities compared to less common matters and complex situations. Based on the findings, recommendations are made for VE researchers, designers, teachers, and students.
{"title":"THE EFFECTS OF VIRTUAL EXCHANGE ON NON-ENGLISH MAJORS’ SPEAKING SKILLS AT IUH","authors":"None NGA THI TUYET PHAN*, None HO THI HIEN, None DO NGOC CAM TU, None HO VAN THAI","doi":"10.46242/jstiuh.v64i04.4896","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4896","url":null,"abstract":"The potential of virtual exchange (VE) to improve oral communication skills of learners in non-English speaking countries has not been acknowledged in the literature. However, despite the expansion of VE programs for on-demand language practices in mainstream foreign language education and the growing number of research into VE worldwide, the potential of VE has not been recognized in Vietnam. This study explored the effects of VE on the speaking skills of non-English majors at a Vietnamese technical university. It used a survey with Likert-type options, interviews, and students' language samples to examine both the perceived and actual impact of VE. The findings show that all participants believed in the encouraging effects of VE on students' debate skills, idea exchanges, learning process, sense of improvement and achievement, confidence, interaction, and speaking motivation. Five elements of speaking skills, namely Grammar, Vocabulary, Pronunciation, Fluency, and Discourse Management, were improved, with Discourse Management showing the most progress and Grammar showing the least. Linguistic analysis indicates that student participants actually made progress in their oral communication skills. However, improvement varied depending on the topic, with participants showing more improvement in familiar or easy speaking activities compared to less common matters and complex situations. Based on the findings, recommendations are made for VE researchers, designers, teachers, and students.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487005","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}
Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4890
None TRIEU KHOA NGUYEN, None THO NGUYEN VAN
This article presents a study on numerical simulation of the influence on operating parameters of an electrospinning device using the Taguchi method and analysis of variance (ANOVA). First, three parameters - voltage, the distance between the nozzle and collector, and collector size - that are important parameters affecting the electrospinning process are selected for the study. Through pre-feasibility simulations, three levels of values for each parameter are selected, and therefore, the L9 orthogonal array is suitable for this investigation procedure. Using this orthogonal array, nine simulations of the electrospinning process were carried out. Then, the S/N ratio and ANOVA were used to determine the optimal levels of the factors and their influence on the normal current density. The results show that voltage has the most influence, accounting for 84.09%, on the output. An additional numerical simulation was carried out to validate the efficacy of the Taguchi method. The result obtained was -154.92 A/m2, which was more optimal than the previous nine results. Hence, a conclusion could be drawn that the Taguchi method, with ANOVA, was a simple but powerful tool for studying the electrospinning process.
{"title":"NUMERICAL SIMULATION OF THE ELECTROSPINNING PROCESS USING THE TAGUCHI METHOD","authors":"None TRIEU KHOA NGUYEN, None THO NGUYEN VAN","doi":"10.46242/jstiuh.v64i04.4890","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4890","url":null,"abstract":"This article presents a study on numerical simulation of the influence on operating parameters of an electrospinning device using the Taguchi method and analysis of variance (ANOVA). First, three parameters - voltage, the distance between the nozzle and collector, and collector size - that are important parameters affecting the electrospinning process are selected for the study. Through pre-feasibility simulations, three levels of values for each parameter are selected, and therefore, the L9 orthogonal array is suitable for this investigation procedure. Using this orthogonal array, nine simulations of the electrospinning process were carried out. Then, the S/N ratio and ANOVA were used to determine the optimal levels of the factors and their influence on the normal current density. The results show that voltage has the most influence, accounting for 84.09%, on the output. An additional numerical simulation was carried out to validate the efficacy of the Taguchi method. The result obtained was -154.92 A/m2, which was more optimal than the previous nine results. Hence, a conclusion could be drawn that the Taguchi method, with ANOVA, was a simple but powerful tool for studying the electrospinning process.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487140","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}
Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4891
None HOANG THI TU UYEN
The article proposes an algorithm for trajectory tracking control problem of full actuated surface ships in the presence of state constraints, the delay of the input signal, and uncertain model parameters. During the design process, radial basis function neural networks are used to approximate the nonlinear components of uncertainty and a symmetric barrier Lyapunov function is incorporated to cope with the constraints of compensated tracking error. In particular, an auxiliary system is employed to eliminate the delay of the input signals, which often makes the control performance worse, even unstable. The adaptive controller that the article proposes is built based on the backstepping method using a command filter to avoid derivative explosion and reduce the computational burden on the controller. The article shows that tracking errors of surface ship can converge to a small neighborhood of zero, the compensated tracking error constraints of the system are not violated, the system is still stable when the input signal is delayed.
{"title":"ADAPTIVE NEURAL TRACKING CONTROL FOR SURFACE SHIP WITH COMPENSATED TRACKING ERROR-CONSTRAINS AND DELAY INPUT BASED ON COMMAND-FILTER","authors":"None HOANG THI TU UYEN","doi":"10.46242/jstiuh.v64i04.4891","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4891","url":null,"abstract":"The article proposes an algorithm for trajectory tracking control problem of full actuated surface ships in the presence of state constraints, the delay of the input signal, and uncertain model parameters. During the design process, radial basis function neural networks are used to approximate the nonlinear components of uncertainty and a symmetric barrier Lyapunov function is incorporated to cope with the constraints of compensated tracking error. In particular, an auxiliary system is employed to eliminate the delay of the input signals, which often makes the control performance worse, even unstable. The adaptive controller that the article proposes is built based on the backstepping method using a command filter to avoid derivative explosion and reduce the computational burden on the controller. The article shows that tracking errors of surface ship can converge to a small neighborhood of zero, the compensated tracking error constraints of the system are not violated, the system is still stable when the input signal is delayed.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487007","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}
Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4885
None TRUONG THI BICH HONG
This paper focuses on introducing an overview of aerobic granular sludge technology, granulation, removal efficiency and application of aerobic granules in wastewater treatment. Aerobic granular sludge has a bacterial layered structure including anaerobic, anoxic and aerobic bacteria in order from inside to outside layer, so it is capable of simultaneous chemical oxygen demand, nitrogen and phosphorus removal. Granular sludge also has capacity to remove persistent organic substances and adsorb heavy metals. As a result, aerobic granular sludge technology can be effectively applied for municipal and industrial wastewater treatment. Many wastewater treatment plants applying aerobic granular sludge technology have been deployed, most commonly in Europe and especially in the Netherlands, which is the first place to apply this technology in practical wastewater treatment with Nereda® trademark. However, aerobic granular sludge is stable on batch reactors and takes months to form stable granular sludge. Therefore, it is necessary to have further researches on the granulation mechanism and affective factors to shorten the time of aerobic granular sludge formation as well as maintain the long-term stability of the granular sludge and develop continuous reactors to maintain the stability of the aerobic granular sludge to meet the requirement of wastewater treatment plants in practice.
{"title":"REVIEW OF AEROBIC GRANULAR SLUDGE TECHNOLOGY AND APPLICATION IN WASTEWATER TREATMENT","authors":"None TRUONG THI BICH HONG","doi":"10.46242/jstiuh.v64i04.4885","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4885","url":null,"abstract":"This paper focuses on introducing an overview of aerobic granular sludge technology, granulation, removal efficiency and application of aerobic granules in wastewater treatment. Aerobic granular sludge has a bacterial layered structure including anaerobic, anoxic and aerobic bacteria in order from inside to outside layer, so it is capable of simultaneous chemical oxygen demand, nitrogen and phosphorus removal. Granular sludge also has capacity to remove persistent organic substances and adsorb heavy metals. As a result, aerobic granular sludge technology can be effectively applied for municipal and industrial wastewater treatment. Many wastewater treatment plants applying aerobic granular sludge technology have been deployed, most commonly in Europe and especially in the Netherlands, which is the first place to apply this technology in practical wastewater treatment with Nereda® trademark. However, aerobic granular sludge is stable on batch reactors and takes months to form stable granular sludge. Therefore, it is necessary to have further researches on the granulation mechanism and affective factors to shorten the time of aerobic granular sludge formation as well as maintain the long-term stability of the granular sludge and develop continuous reactors to maintain the stability of the aerobic granular sludge to meet the requirement of wastewater treatment plants in practice.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487001","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}
Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4889
None VO TAN CHAU, None TRAN DANG LONG, None HUYNH BA VANG, None DUONG HOANG LONG, None NGUYEN HUU HUONG
The combustion process in the internal combustion engine is realized as the core of the engine's power and exhaust emission formation. This paper describes the design of a constant volume combustion chamber (CVCC) to simulate the combustion process of the diesel engine with the optical approach technique. The technical design standards of the chamber were based on the actual conditions of diesel engines with a compression ratio of 16 to 28 and an injection profile with a fuel pressure varying between 400 and 1600 bar. The system included 2 quartz crystal windows that allow observing the entire process of fuel injection and combustion taking place inside the chamber. The structural strength analysis of the design under simulating pressure was carried out by ANSYS software. The results revealed that the chamber met durable standards with each type of material based on design criteria with a pressure of 200 bar selected as the ambient pressure inside the chamber.
{"title":"DESIGN OF A CONSTANT VOLUME COMBUSTION CHAMBER WITH OPTICAL APPROACH TECHNIQUE","authors":"None VO TAN CHAU, None TRAN DANG LONG, None HUYNH BA VANG, None DUONG HOANG LONG, None NGUYEN HUU HUONG","doi":"10.46242/jstiuh.v64i04.4889","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4889","url":null,"abstract":"The combustion process in the internal combustion engine is realized as the core of the engine's power and exhaust emission formation. This paper describes the design of a constant volume combustion chamber (CVCC) to simulate the combustion process of the diesel engine with the optical approach technique. The technical design standards of the chamber were based on the actual conditions of diesel engines with a compression ratio of 16 to 28 and an injection profile with a fuel pressure varying between 400 and 1600 bar. The system included 2 quartz crystal windows that allow observing the entire process of fuel injection and combustion taking place inside the chamber. The structural strength analysis of the design under simulating pressure was carried out by ANSYS software. The results revealed that the chamber met durable standards with each type of material based on design criteria with a pressure of 200 bar selected as the ambient pressure inside the chamber.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487002","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}
Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4892
None ONG MAU DUNG
Ultra-low-power wireless networks have a vast array of potential applications, which are becoming increasingly achievable as technology gets smaller. Before these systems can be used to their full potential, however, efficient methods of data transfer are imperative in order to keep power consumption low while allowing the devices to cooperate as one unit or group. The transfer of large files, such as image data, presents a particular challenge because of the size limits imposed by the 802.15.4 MAC protocol. Operating sensory nodes at larger distances than normal also results in significant data loss. This paper presents a solution to this issue using a modified sensor network that includes nodes dedicated to listening for packet recovery. A set of algorithms is devised in order to allow nodes to detect missing data from a source as well as offer the ability to request that missing data from one of the dedicated relay nodes. The methods described were tested with the iMote2 device and found to almost double the distance at which two nodes can be placed from each other while still maintaining reliable data transfer. It was also concluded that the Linux driver in charge of passing values from the 802.15.4 chip to the MAC layer does not properly pass the Cyclical Redundancy Check (CRC) result into the MAC frame. As a result, it is not possible to filter out corrupt data at the application layer.
{"title":"VIDEO SENSOR OVER ULTRA-LOW POWER RELAY WIRELESS NETWORKS","authors":"None ONG MAU DUNG","doi":"10.46242/jstiuh.v64i04.4892","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4892","url":null,"abstract":"Ultra-low-power wireless networks have a vast array of potential applications, which are becoming increasingly achievable as technology gets smaller. Before these systems can be used to their full potential, however, efficient methods of data transfer are imperative in order to keep power consumption low while allowing the devices to cooperate as one unit or group. The transfer of large files, such as image data, presents a particular challenge because of the size limits imposed by the 802.15.4 MAC protocol. Operating sensory nodes at larger distances than normal also results in significant data loss. This paper presents a solution to this issue using a modified sensor network that includes nodes dedicated to listening for packet recovery. A set of algorithms is devised in order to allow nodes to detect missing data from a source as well as offer the ability to request that missing data from one of the dedicated relay nodes. The methods described were tested with the iMote2 device and found to almost double the distance at which two nodes can be placed from each other while still maintaining reliable data transfer. It was also concluded that the Linux driver in charge of passing values from the 802.15.4 chip to the MAC layer does not properly pass the Cyclical Redundancy Check (CRC) result into the MAC frame. As a result, it is not possible to filter out corrupt data at the application layer.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487000","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}
Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4888
None AO HUNG LINH
This paper presents a new method for roller bearing fault diagnosis based on least square support vector machine (LSSVM) with parameters optimized by Backtracking Search Optimization Algorithm (BSOA), namely BSOA-LSSVM. First, roller bearing acceleration vibration signals are decomposed into functions by using Variational Mode Decomposition (VMD) method. Second, initial feature matrices are extracted from those functions by energy entropy to obtain feature matrix. Third, these values serve as input vector for BSOA - LSSVM classifier. Experimental results showed that the proposed method gave the higher classification accuracy (100%) and shorter computational time than other method.
{"title":"A NEW ROLLER BEARING FAULT DIAGNOSIS METHOD BASED ON VMD ENERGY ENTROPY AND BSOA-LSSVM","authors":"None AO HUNG LINH","doi":"10.46242/jstiuh.v64i04.4888","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4888","url":null,"abstract":"This paper presents a new method for roller bearing fault diagnosis based on least square support vector machine (LSSVM) with parameters optimized by Backtracking Search Optimization Algorithm (BSOA), namely BSOA-LSSVM. First, roller bearing acceleration vibration signals are decomposed into functions by using Variational Mode Decomposition (VMD) method. Second, initial feature matrices are extracted from those functions by energy entropy to obtain feature matrix. Third, these values serve as input vector for BSOA - LSSVM classifier. Experimental results showed that the proposed method gave the higher classification accuracy (100%) and shorter computational time than other method.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487139","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}
Pub Date : 2023-09-15DOI: 10.46242/jstiuh.v64i04.4895
None NGUYEN XUAN HONG*, None LE THI THIEN PHUOC, None QUACH THI TO NU, None NGUYEN THI DIEM THI, None LE THI THUY
The rapid social development taking place in the last decades has been inextricably linked with the evolution of technology, which has had profound impacts on various sectors and services, especially education. The incorporation of information and communication technologies (ICTs) into daily pedagogical practices has emerged as a viable solution for innovating the educational system. In this context, a quantitative study was conducted to explore how non-English majors self-perceived their English-speaking proficiency and utilized technological tools for self-development. The study surveyed 1,036 out of 3,991 (27%) second-year students who were not English majors and were attending a public university in Vietnam. The data collection and analysis revealed that while the participants had positive self-perceptions towards English learning, they also acknowledged areas that need improvements in their English-speaking skill. The study also indicated that certain educational technological tools have been used by the participants to improve their English-speaking proficiency. The findings of the study underscored the importance of incorporating technological tools into language learning to promote more engagement and opportunities for practice. Additionally, the study emphasized the crucial role of teachers in promoting the use of technological advancements in various language learning environments.
{"title":"INVESTIGATING NON-ENGLISH MAJORED STUDENTS' SELF-PERCEPTIONS OF ENGLISH-SPEAKING PROFICIENCY AND THE USE OF TECHNOLOGICAL TOOLS FOR SELF-DEVELOPMENT","authors":"None NGUYEN XUAN HONG*, None LE THI THIEN PHUOC, None QUACH THI TO NU, None NGUYEN THI DIEM THI, None LE THI THUY","doi":"10.46242/jstiuh.v64i04.4895","DOIUrl":"https://doi.org/10.46242/jstiuh.v64i04.4895","url":null,"abstract":"The rapid social development taking place in the last decades has been inextricably linked with the evolution of technology, which has had profound impacts on various sectors and services, especially education. The incorporation of information and communication technologies (ICTs) into daily pedagogical practices has emerged as a viable solution for innovating the educational system. In this context, a quantitative study was conducted to explore how non-English majors self-perceived their English-speaking proficiency and utilized technological tools for self-development. The study surveyed 1,036 out of 3,991 (27%) second-year students who were not English majors and were attending a public university in Vietnam. The data collection and analysis revealed that while the participants had positive self-perceptions towards English learning, they also acknowledged areas that need improvements in their English-speaking skill. The study also indicated that certain educational technological tools have been used by the participants to improve their English-speaking proficiency. The findings of the study underscored the importance of incorporating technological tools into language learning to promote more engagement and opportunities for practice. Additionally, the study emphasized the crucial role of teachers in promoting the use of technological advancements in various language learning environments.","PeriodicalId":471794,"journal":{"name":"Tạp chí Khoa học và Công nghệ- Trường Đại học Công nghiệp Thành phố Hồ Chí Minh","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487006","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}
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