A rehabilitation robot is a device that has been proving its positive effectiveness in the process of helping patients recover quickly after a stroke. Researching, designing, and manufacturing robot models in general and upper limb rehabilitation robots in particular are very practical. In this study, we proposed to combine the use of an algorithm and a physical modeling method to shorten the calculation process and design an upper limb rehabilitation robot. First, an exoskeleton upper limb rehabilitation robot model (UExosVN) was briefly described. Next, in turn, all the important problems including inverse kinematics, inverse dynamics for this robot model were proposed and solved by using optimization algorithms and physical modeling methods. The model was evaluated in the critical movement of daily operations. The results after the testing process have proven the accuracy and effectiveness of the proposed methods.
This paper presents and analyses characteristics of the excitation control of DFIG connected to the grid basing on the rotor similar signal method. It also identifies the control object and then proposes the controllers of the active power and the reactive power of DFIG fed into grid. There are two PID controllers used to independently control the active power and the reactive power. The parameters of the PID can be changed and adjusted by the fuzzy tuner to improve the quality of system. Basing on this control system, the quality of the system is good; such as time transition and time response of this system are very small in comparison with those of the system of previous researches.
We present a multi-physics simulation associated with experimental investigation for an electrohydrodynamic gyroscope based on ion wind corona discharge. The present device consisting of multiple point-ring electrodes generates a synthetic jet flow of ions for inertial sensing applications. Meanwhile the residual charge of jet is neutralized by an external ring electrode to guarantee the ion wind stable while circulating inside the device's channels. The working principle including the generation and then circulation of jet flow within the present device is firstly demonstrated by a numerical simulation and the feasibility and stability of the device are then successfully investigated by experimental work. Results show owing to the ion wind corona discharge based approach associated with new configuration, the present device is robust and consumes low energy.
Objective: This study was conducted with the objective of describing the current status of surgical safety at Gia Dinh People Hospital in Ho Chi Minh City in 2021. Method: this study used cross-sectional description, quantitative method. The period time was from February 2021 to September 2021 at Gia Dinh People Hospital, Ho Chi Minh City. The sample size was 135 surgeries and related health staffs and documents. The study used a checklist to assess the safety level, classified according to Decision No.7482/QD-BYT. Collected data were entered using SPSS 25.0 software to analyse frequency and mean. Results: the hospital scored a safety level of 89.5/111, reaching level 4 - ensured surgical safety. All 8 criteria obtained partial pass, criterion 5 has the highest rate of surgery meet its requirements (76.3%) while 3 criteria 2, 4 and 6 have no surgery meeting their requirements. 43 of 67 sub-items were assessed as passing, 21 of 67 sub-items were assessed as partial pass, and 3 of 67 sub-items failed. Keywords: Surgical safety, hospital, 7482/QD-BYT, safety level, criteria.
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