This research aims to discover the key factors influencing customer acceptance of home cleaning service applications in Da Nang. Survey data collected from 400 people currently living in Da Nang city has been analyzed to provide evidence. The results from the regression analysis by the SPSS tool have shown that there are 6 factors and decreasing levels to the decision to accept the home cleaning service application, which is: Perceived usefulness, Amount of information about the application, Perceived enjoyment, Perceived risk, Security and privacy and Perceived ease of use. As a result, the author gives management implications to attract customers to use Da Nang city's home cleaning service application.

Keywords: Customer acceptance, perceived usefulness, perceived ease of use, perceived enjoyment, perceived risk, amount of application information, security and privacy.

In this paper, we suggest a structure of PID controller for trajectory tracking of two-link robot manipulator. Because PID algorithm is not guaranteed by mathematics, genetic algorithm is used to find the suitable control parameters. The ability of controller is proved through Matlab/Simulink simulation.

Keywords: PID control, genetic algorithm, robot manipulator, two-link.

Balancing inverted pendulum on cart is classical problem that is solved in many researches. However, there is no study about the operation of this model in contacting with environment to satisfy a requirement. Thence, in this paper, we suggest a problem of controlling cart and pole which needs to move through an operating pinwheel without touching the wings of pinwheel. We propse the parameters for total structure. Then, a process of calculating the requirement of velocity of rotating pinwheel is described. The process of solving this mathematical problem is a reference for similar researches.

Keywords: Cart and pole, inverted pendulum, pinwheel, balancing control.

The bicycle is a popular means of transportation. However, the bicycle is typically an unstable system, it will fall down without the assistance of rider like steering the handle or moving their upper body. Every rider needs to practice to ride a bicycle. Therefore, it is essential to develop a balanced support system for the bicycle rider. This paper presents the balance control of the bicycle with the reaction wheel. A simple model of the bicycle is generated by the Euler-Lagrange method. A Fuzzy-LQR controller is designed and compared to a popular LQR controller. The Fuzzy-LQR controller is proved to be better than the LQR controller through Matlab/Simulink simulation.

Keywords: Bicycle, Fuzzy-LQR, reaction wheel, Euler-Lagrange.

Learning is a dynamic process that requires the active participation of the student, as well as the timely intervention of the teacher and the authorities of higher education institutions. In this sense. It is important to point out that identifying learning styles from the diagnostic evaluation will allow the design of actions and strategies aimed at the formulation of novel methods for adequate didactics and meaningful learning. That is why the objective of the article is to identify the learning styles in a group of students of the degree in psychology of the University Innova. In such a way, that it allows to design actions that favor the correct teaching-learning process of psychology. Finally, it is of the utmost importance that psychology academies apply these types of activities to make agreements that allow us to continue advancing in an adequate pedagogical action for the adequate didactics of psychological science.

Keywords: learning styles, psychology students, learning strategies.

Chemical Engineering is a profession in which the knowledge of basic sciences and other natural sciences is applied to develop economic ways of using materials and energy for the benefit of mankind. Therefore, it is a core responsibility of chemical engineers to either maximize or minimize the cost of manufacturing useful products. This has to do with identifying constraints affecting variables for the purpose of optimization. Most often, engineers trust Simplex linear programming (LP) technique as it can solve multiple variable problems. Softwares readily available to do the tasks are Tora, Lingo and Excel Solver among others. C++ program based on Simplex technique will be run for solution of three literature work on chemical engineering optimization and result compared with the Lingo application.......

Keywords: Simplex method, linear programming, C++ programming, Lingo, chemical engineering optimization