TẠP CHÍ KHOA HỌC TRƯỜNG ĐẠI HỌC TRÀ VINH

The Timoshenko beam theory is widely used in various fields due to its ability to accurately model the behavior of beams with specific characteristics. However, when it comes to analyzing large deflection beams, the Timoshenko beam theory becomes less precise. This paper introduces a proposed discrete Timoshenko beam model to predict the mechanical behavior of slender beams subjected to large deflections under various loadings. A mathematical analysis was developed and validated using finite element analysis in conjunction with a compliant mechanism. The modeling results demonstrate that the force-displacement behavior of a bistable mechanism can be accurately captured by the discrete Timoshenko beam model. In particular, when comparing the discrete Timoshenko beam model and finite element analysis, the maximum and minimum forces exhibited a strong agreement, with a percentage difference of less than 3% and 5%, respectively. In terms of the total elastic strain energy and maximum principal stress, the deviations between the discrete Timoshenko beam model and finite element analysis were approximately 2% and 7%, respectively. The proposed model can be integrated into an optimization algorithm for designing compliant mechanisms.

The research was conducted to understand the reality of integrating testing and assessment of students’s soft  skills in teaching specialized knowledge at the Department of Office Administration - Library of Tra Vinh  University. The results show that this work has advantages such as the person who performs the evaluation is experienced; the facilities for this work are relatively adequate; some specific subjects have flexible testing and evaluation forms. There are still limitations that are the assessment is still qualitative; only focus on testing and assessment some key skills; assessment tests have not been conducted on all students. Since then, it is  necessary to have solutions to overcome the above limitations and the first important premise is to properly evaluate the importance of soft skills to make changes for improving the effectiveness of testing and assessment of students’s soft skills in teaching specialized knowledge.

One critical measurement of success in workplaces is the abilities of graduates in applying the knowledge, skills and values into the needs of their job. This study was conducted to seek the gap of soft skills of Tra Vinh  University students compared to labour-market standard. The quantitative data was collected at School of Economics and Law with a sample of 362 students and 300 graduates to measure their soft skills. Generally, both students and graduates are still unconfident of their own soft skills, this affacts their self-affirmation. Moreover, the importance of soft skills is also acknowledged, namely critical thinking, problem-solving,  selflearning, work-management skills and teamwork as well as communication skills which need to beprioritized equipped for any kinds of workplaces. Nonetheless, the aforementioned skill gap is significantly remarkable, especially regarding the communication skills. Based on these analyzes, some solutions are proposed to the work recruitment, schools and graduates to lessen the skill gap and meet the demands of labour markets.

Tetralogy of Fallot is a common cyanotic congenital heart disease. Early surgery treatment gives patients a chance to have normal physical and mental health due to preventing complications of cyanosis and even death as a natural history of tetralogy of Fallot. This study aimed to show short-term outcomes (including the time of postoperative hospital stay and 30 days after discharge) of tetralogy of Fallot complete repair at the Department of Pediatric Cardiac Surgery, Cho Ray Hospital. A retrospective study was performed on the dataof medical documents of 38 patients, who underwent complete repair for tetralogy of Fallot with full sternotomy and cardiopulmonary bypass from March 2017 to December 2019, following a collection form. The results showed the average age and weight were 33.89±13.02 months and 11.77±2.48 kg. The cardiopulmonary bypass time was 147.74±12.48 mins, the aortic cross-clamp time 104.84±9.73 mins, the mechanical ventilation time 31.14±10.75 hours, the duration of stay in the intensive care unit 58.03±13.56 hours, the postoperative hospital stay time 10.12±1.5 days, and the mortality rate 2.6%. The study concludes that the short-termsurgical outcome of complete repair for tetralogy of Fallot in lightweight children is safe and effective with a low mortality rate.

The genie characters in Vietnamese legends are a topic that attracts many scientists, especially in studying genie characters from the historical-cultural perspective because Vietnamese folk legends are mostly associated with historical stories and national heroes. Moreover, the study of genie characters in the integration  between the study of legend and history is the source of feelings of honor, praise and nationalpride. From this perspective, it shows that the genie characters are historicized, deified, worshiped, and the legends about genies become documents for national history. Folk festivals have become vivid symbols of genies’s beliefs. This signifies the particularly important position of the genies in the legend as well as in theprocess of national history and also in the minds of Vietnamese people for a long time.

This article is to review researches in Vietnam on the behavioral culture of medical staff towards patients in Ho Chi Minh City. As a result, the study summarizes the achievements and limitations of researches on behavioral culture in general as well as researches on behavioral culture of medical staff in particular. This is the basis for the author to build a theoretical framework, gaps in research on behavioral culture of medical staff towards patients in Ho ChiMinh City.

The Khmer language vocabulary is not only inherent in the Khmer language but is also characterized by the fact that it is composed of elements from other languages and gradually becomes an indispensable part of the language system in Khmer language. If the concept of Khmer is just the word available in the Khmer language at the newly formed stage, it will be difficult to see the change and development of the Khmer itself and not reflect the true nature of the Khmer language. In terms of origin, the SanscritPali words have been high-level Khmerized, so Khmer language users do not consider them as extrinsic words but native words - pure Khmer words.

In order to improve the quality of life for handicapped people, push-pull tricycle is designed to transform into solar tricycle. It has a 24 V – 250 W electric motor on the front wheel installed which is powered by two 12 V – 30 Ah storage batteries and a bracket with four 12 V – 55 W solar panels. The bracket with solar panels also works as a hood to cover the driver. The transmission has been modified from hard to sliding link so that when the tricycle runs by electrical power, the push-pull motion of the steering wheel does not move according to the front wheel. The solar tricycle operates in one of three modes: only by the electric engine when traveling on flat roads, by combining electricity and hands in case of uphill or weak power, using the push–pull function when running out of power or moving short distances. Tests and calculations show that the tricycle can cover a distance of 24.7 km by only relying on the batteries or 48 km by mixing batteries with solar panels on asunny day. Single unit production cost is 10 million VND and mass production is about 7 million VND. Compared to other tricycles for people with disabilities, this model has the advantages in both operation and price.

This article is to provide technical solutions to improve the working environment for workers operating fabric-cutting machines in the textile industry. The author's team surveyed a large number of workers in textile and garment enterprises in Long An, Ben Tre, Ho Chi Minh City, Hanoi, and Da Nang. From the collected data, the author assessed the current situation and classified working conditions for workers operating fabric cutters, and then proposed technical solutions about the recommended working environment for the workers. The research results can be considered a reference for further research related to workers' working condition improvement, particularly in the textile industry in Vietnam.

Anti-lock Braking System is one of the vital safety features in modern cars and trucks that can prevent the wheels from locking while the brakes are applied in the moving vehicles. During a braking condition, speed sensors in ABS send signals to the Anti-lock Braking System control unit to estimate the wheel slip ratio, and if the ratio is different from the desired value, the control unit will send a message to the braking actuator to control braking torque. In this paper, the dynamics and subsystems of the Anti-lock Braking System are presented and a model of the Anti-lock Braking System is developed in MATLAB/SIMULINK software. Different types of controllers, including the Bang-Bang controller, proportional-integral, proportional derivative, and proportional integral derivative controllers, are integrated into the model to investigate the effects of controlling strategies on the stopping distance, vehicle velocity, slip ratio, and braking torque. The simulation results show that the proportional derivative and proportional integral derivative controllers provide the shortest stopping distances and stopping times as compared with Bang-Bang and proportional-integral controllers on different types of roads. Furthermore, it also observed that the slip ratio during braking is kept similar to the desired value (20%) with the proportional derivative and proportional integral derivative controllers while it fluctuates between 10% and 30% for BangBang and proportional-integral controllers. The trend of the braking torque is also similar to the slip ratio. The model can be used to predict the braking performance of the Anti-lock Braking System under different conditions.