Precision beam pointing is the key indicator for APT (acquisition, and tracking) system in space laser communication. The travels inside optical vector will be affected by an assembly error of axis reflectors. In this paper, model path coaxiality induced are established; distribution given a quantitative analysis performed. results show that magnitude assembling greatly but its susceptible to r...

The goal of this study is to develop, test, and compare multinomial logistic regression (MLR) and support vector machines (SVM) in classifying preschool-aged children physical activity data acquired from an accelerometer. In this study, 69 children aged 3-5 years old were asked to participate in a supervised protocol of physical activities while wearing a triaxial accelerometer. Accelerometer c...

Background. It is well known that overarm throwing is one of the most performed activities in the handball. Shoulder and glenohumeral injuries incidence are high in handball because of both pass, and shooting activity was executed repeatedly in high angular speed. Objectives. This study set out to investigate the usefulness of inexpensive commercial inertial movement sensors for prediction of ...

The Internet of Things (IoTs) will change the requirements for wireless connectivity significantly, mainly with regard to service coverage, data rate, and energy efficiency. Therefore, to improve robustness and reliability, WiFi-enabled IoT devices have been developed to use narrowband communication. However, narrowband transmission in WiFi such as IEEE 802.11ah causes relatively higher frequen...

Ensuring a high accuracy when measuring the parameters of devices under testing is an important task conducting research in terahertz-frequency range. The purpose this paper practical study thermal drift errors vector network analyzer using low-terahertz-frequency extender modules. For this, change measurement error, which function time, was analysed system, based on Keysight N5247B and coverin...

Adaptive algorithms are used in updating the filter coefficients for active noise cancellation applications reduction of vehicle cabin noise. The performance adaptive low-frequency depends on how efficiently it alters coefficient to minimize difference between approximated signal and original one. Here is proposed an model, using low pass fixed before filter, order improve algorithm. Convergenc...