This paper shows the coordinates influence on singularity of a three degree-of-freedom structure, namely, three-Universal-Prismatic-Spherical (3-UPS) parallel manipulator. Rotational coordinates, which are chosen to define the orientation of the platform, affect the singularity of the manipulator. Euler parameters, which don't have any inherent geometrical singularity are utilized, however they...

The chewing of betel nut is prevalent throughout the Asia-Pacific region, especially in the Pacific subregion. Consumed for its stimulant properties, there is concern over this habit’s association with negative health consequences. The present study examines the case of Honiara in Solomon Islands where the prevalence of betel nut consumption has increased in recent years, especially among schoo...

This study compared the biomechanics of 3 fixation techniques: bilateral pedicle screw (BPS) fixation, unilateral pedicle screw (UPS) fixation, and UPS supplemented with translaminar facet screw (UPS+TLFS) fixation. The study was conducted in an L3-L5 finite element model. Three different finite element models were created by adopting different fixation techniques after removal of the left L3-L...

In this paper, a parallel mechanism with two rotational degrees of freedom is proposed. It could rotate freely and continuously around the coordinate axes at fixed origin frame. The structure second-order over constraint moving platform base are connected by five kinematic chains. motion characteristics analyzed reciprocal screw equation. Then, kinematics dynamics modelling carried out systemat...