This paper presents a novel three-DOF robotic finger that enables fast tapping motion applicable in piano playing and keyboard typing, which consists of metacarpophalangeal(MCP), proximal ...interphalangeal(PIP), and distal interphalangeal(DIP) joints. In previous study, we developed Twisted Round-belt Actuator(TbA) capable of producing contraction force by twisting a small-diameter round-belt having high elasticity, and empirically derived a contraction force model applicable only to two-DOF robotic finger. This study, therefore, derives such force model available for an extended three-DOF finger mechanism that is containing Variable-pitch Screw Module(VpSM) newly designed in this paper. This module is able to eliminate irregular twist phenomenon resulting in unexpected discontinuous movement in finger joints. Thus, we first describe the detail mechanism of the three-DOF robotic finger and indicate great advantage of the finger, which is obtained by combining the TbA and VpSM. Finally, we demonstrate a new force feedback method based on fingertip force estimation without any force/pressure sensors, in which the fingertip force can be accurately estimated by using mathematical model of the contraction force by TbA with VpSM.
Privacy and security are the main concern of any social media network sites such as Facebook, Twitter, and Linked In etc. The primary purpose of these sites is to allow people to share interests, ...activities, real-life connections. Lack of attention to privacy and security on social media does seem to be odds with the belief as individual responsibility. Network virtualization, media independence and FAME etc., are the technologies which are used for protecting the user's information over the internet. In this paper, we describe various methods for securing the data with some threats and solution. Finally, concludes with a few suggestions as future research direction.
