scholarly journals Haptic Soft-Keyboard for Tablet-Sized Touchscreens

2019 ◽  
Vol 9 (15) ◽  
pp. 3080
Author(s):  
Sunjin Yu ◽  
Sung Hun Jin ◽  
Kwangtaek Kim
Keyword(s):  
Optimal Design ◽  
Mobile Phones ◽  
Piezoelectric Actuator ◽  
User Study ◽  
Piezoelectric Actuators ◽  
Tactile Feedback ◽  
Force Distribution ◽  
Psychophysical Experiment ◽  
New Approach ◽  
Linear Motors

Most users are not satisfied with the typing vibration feedback from linear motors of mobile phones since it feels like buzzing rather than physical key pressing feedback. For larger touchscreens, such as 10.1 inch tablets, there is no commercial tactile soft keyboard developed yet. Therefore, there is the need to develop a haptic soft keyboard technology imitating the physical keyboard for the tablet-sized touchscreen. In the present study, we present a new approach introducing an optimal design of a multilayered piezoelectric actuator that meets the need for a haptic soft keyboard for 10.1 inch tablets, implementing stronger tactile feedback that utilizes human sensitivity to time differences obtained by a psychophysical experiment and equalizes the force distribution of the touchscreen when using multiple piezoelectric actuators. The developed system was evaluated by a user study measuring typing performance.

scholarly journals Perception-Based Tactile Soft Keyboard for the Touchscreen of Tablets

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Kwangtaek Kim
Keyword(s):  
Mobile Devices ◽  
Piezoelectric Actuators ◽  
Force Distribution ◽  
Psychophysical Experiment ◽  
Input Method ◽  
Optimal Strength

Most mobile devices equipped with touchscreens provide on-screen soft keyboard as an input method. However, many users are experiencing discomfort due to lack of physical feedback that causes slow typing speed and error-prone typing, as compared to the physical keyboard. To solve the problem, a platform-independent haptic soft keyboard suitable for tablet-sized touchscreens was proposed and developed. The platform-independent haptic soft keyboard was verified on both Android and Windows. In addition, a psychophysical experiment has been conducted to find an optimal strength of key click feedback on touchscreens, and the perception result was applied for making uniform tactile forces on touchscreens. The developed haptic soft keyboard can be easily integrated with existing tablets by putting the least amount of effort. The evaluation results confirm platform independency, fast tactile key click feedback, and uniform tactile force distribution on touchscreen with using only two piezoelectric actuators. The proposed system was developed on a commercial tablet (Mu Pad) that has dual platforms (Android and Windows).

Correlating Personality and Actual Phone Usage

2014 ◽  
Vol 35 (3) ◽  
pp. 158-165 ◽  
Author(s):  
Christian Montag ◽  
Konrad Błaszkiewicz ◽  
Bernd Lachmann ◽  
Ionut Andone ◽  
Rayna Sariyska ◽  
...  
Keyword(s):  
Big Data ◽  
Social Network ◽  
Mobile Phone ◽  
Mobile Phones ◽  
Self Report ◽  
Psychological Variables ◽  
New Approach ◽  
Report Data ◽  
Self Report Data ◽  
Voice Calls

In the present study we link self-report-data on personality to behavior recorded on the mobile phone. This new approach from Psychoinformatics collects data from humans in everyday life. It demonstrates the fruitful collaboration between psychology and computer science, combining Big Data with psychological variables. Given the large number of variables, which can be tracked on a smartphone, the present study focuses on the traditional features of mobile phones – namely incoming and outgoing calls and SMS. We observed N = 49 participants with respect to the telephone/SMS usage via our custom developed mobile phone app for 5 weeks. Extraversion was positively associated with nearly all related telephone call variables. In particular, Extraverts directly reach out to their social network via voice calls.

Compact Drive Electronics for Solid-State Actuators

2000 ◽  
Author(s):  
Jeffrey S. N. Paine ◽  
David S. Bennett ◽  
Carlos E. Cuadros
Keyword(s):  
Solid State ◽  
Power Electronics ◽  
Piezoelectric Material ◽  
Piezoelectric Actuator ◽  
Power Dissipation ◽  
Piezoelectric Materials ◽  
Piezoelectric Actuators ◽  
Linear Amplifier ◽  
Overall Efficiency ◽  
Electronics Packages

Abstract As piezoelectric actuators are developed for high strokes and/or high force applications, the amount of piezoelectric material used in the actuator must also increase. Reducing the size of drive electronics becomes difficult using traditional linear power electronics packages when applications require as much as 40 μF of piezoelectric load. In order to efficiently drive piezoelectric actuator systems, bi-directional systems (drivers that recover the energy put into the piezoelectric capacitor) must be used. Since less than 10% of the power going into the piezoelectric actuator is real versus the large reactive load used to power the piezoelectric materials, bidirectional systems have a much higher efficiency. A comparison is made between traditional linear and PWM amplifier systems and tailored piezoelectric bi-directional driver systems. Bi-directional systems have power dissipation levels up to 1/8th those of traditional linear amplifier systems. In the course of the research both linear and PWM concepts were investigated. A rationale for comparing the overall efficiency of drive electronics systems is presented. Some innovative efficient concepts for piezoelectric system drivers are presented and discussed.

Ferroelectric materials for piezoelectric actuators by optimal design

2011 ◽  
Vol 59 (10) ◽  
pp. 3770-3778 ◽  
Author(s):  
K.P. Jayachandran ◽  
J.M. Guedes ◽  
H.C. Rodrigues
Keyword(s):  
Optimal Design ◽  
Piezoelectric Actuators ◽  
Ferroelectric Materials

scholarly journals Crowdsensing – a new approach to road quality assessment

2021 ◽  
Vol 67 (1) ◽  
pp. 19-30
Author(s):  
Ivana Grujić ◽  
Marijana Petrović ◽  
Nataša Bojković
Keyword(s):  
Data Collection ◽  
Quality Assessment ◽  
Mobile Phones ◽  
Road Traffic ◽  
Embedded Sensors ◽  
Smart Devices ◽  
The Internet ◽  
New Approach ◽  
Mobile Crowdsourcing ◽  
Vibration Data

The continuous development of information and telecommunication technologies has led to the possibility of transferring data and information between people in real time, in just a few seconds, which has led to the emergence of new approaches to data collection. An example is crowdsourcing (networked mass of people), which involves collecting a large amount of defined data from a large number (mass) of people through the Internet, that is, embedded sensors in smart devices. These are most often mobile phones and then it is about the concept of mobile crowdsourcing – which is more widely accepted under the term crowdsensing. This paper shows how smart devices (mobile phones or tablets) can collect vibration data that occur while driving in road traffic – and still be used to detect irregularities in road infrastructure (potholes, bumps, etc.) in real conditions.

A new approach for optimal design of corona ring

2016 ◽  
Author(s):  
R. M. R. Barros ◽  
E. G. da Costa ◽  
T. V. Ferreira ◽  
J. F. Araujo ◽  
F. L. M. Andrade
Keyword(s):  
Optimal Design ◽  
New Approach ◽  
Corona Ring

A new approach to the optimal design of multiple field-limiting ring structures

2001 ◽  
Vol 16 (10) ◽  
pp. 849-854 ◽  
Author(s):  
Ashutosh Bhardwaj ◽  
Kirti Ranjan ◽  
Namrata ◽  
Sudeep Chatterji ◽  
Ajay K Srivastava ◽  
...  
Keyword(s):  
Optimal Design ◽  
New Approach ◽  
Ring Structures ◽  
Multiple Field

A New Approach to Compensate Oscillations of Path-Linked Presses Caused by Inertial Forces

2016 ◽  
Vol 1140 ◽  
pp. 361-368
Author(s):  
Stefan Hilscher ◽  
Richard Krimm ◽  
Bernd Arno Behrens
Keyword(s):  
Conceptual Design ◽  
Optimization Algorithm ◽  
Evolutionary Optimization ◽  
Inertial Forces ◽  
New Approach ◽  
Virtual Testing ◽  
Linear Motors ◽  
Control Signals ◽  
The Press ◽  
Mass Balancing

Presses with mechanical linkages based on levers between motor and ram (path-linked presses) tend to oscillate due to inertial forces as a consequence of the drive parts motion.In this publication a new approach for a mass-balancing system is presented. This system allows to generate the optimal compensation forces needed to counteract the inertial forces by means of four linear motors. The control signals for the linear motors are specified by an evolutionary optimization algorithm, which operates on the base of measured accelerations of the press frame. The control signals of the linear motors are created in a way that the machines oscillations are reduced to a minimum. This way the presented mass-balancing system adapts itself automatically to varying conditions during the operation of the machine, such as a tool change or a varying stroke rate.In particular, the present publication provides the results of the conceptual design and the virtual testing of this approach, which has been mainly carried out with the help of multiple-body simulations.

Performance Evaluation of Numerical Finite Element Coupled Algorithms for Structure–Electric Interaction Analysis of MEMS Piezoelectric Actuator

2019 ◽  
Vol 16 (07) ◽  
pp. 1850106 ◽  
Author(s):  
Prakasha Chigahalli Ramegowda ◽  
Daisuke Ishihara ◽  
Tomoya Niho ◽  
Tomoyoshi Horie
Keyword(s):  
Finite Element ◽  
Piezoelectric Actuator ◽  
3D Structure ◽  
Time Integration ◽  
Low Frequency ◽  
Piezoelectric Actuators ◽  
Piezoelectric Bimorph ◽  
Iterative Coupling ◽  
Electric Interaction ◽  
Numerical Finite Element

This work presents multiphysics numerical analysis of piezoelectric actuators realized using the finite element method (FEM) and their performances to analyze the structure-electric interaction in three-dimensional (3D) piezoelectric continua. Here, we choose the piezoelectric bimorph actuator without the metal shim and with the metal shim as low-frequency problems and a surface acoustic wave device as a high-frequency problem. More attention is given to low-frequency problems because in our application micro air vehicle’s wings are actuated by piezoelectric bimorph actuators at low frequency. We employed the Newmark’s time integration and the central difference time integration to study the dynamic response of piezoelectric actuators. Monolithic coupling, noniterative partitioned coupling and partitioned iterative coupling schemes are presented. In partitioned iterative coupling schemes, the block Jacobi and the block Gauss–Seidel methods are employed. Resonance characteristics are very important in micro-electro-mechanical system (MEMS) applications. Therefore, using our proposed coupled algorithms, the resonance characteristics of bimorph actuator is analyzed. Comparison of the accuracy and computational efficiency of the proposed numerical finite element coupled algorithms have been carried out for 3D structure–electric interaction problems of a piezoelectric actuator. The numerical results obtained by the proposed algorithms are in good agreement with the theoretical solutions.

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