This paper investigates an alternative mass sensing technique based on nonlinear micro/nanoelectromechanical resonant sensors. The proposed approach takes advantage of multi-stability and bifurcations of the hysteretic frequency responses of the electrostatically-actuated resonator. For this purpose, a reduced-order model is considered. Numerical results show that sudden jumps in amplitude make...

Safety and security applications benefit from better situational awareness. Radar micro-Doppler signatures from an observed target carry information about the target’s activity, and have potential to improve situational awareness. This article describes, compares, and discusses two methods to classify human activity based on radar micro-Doppler data. The first method extracts physically interpr...

The increasing use of social networks generates enormous amounts of data that can be used for various types of analysis. Some of these data have temporal and geographical information, which can be used for comprehensive examination. In this paper, we propose a new method to analyze the massive volume of messages available in Twitter to identify places in the world where events such as TV shows,...

Micro-grid control is the key technology in the process of accessing micro-grid into regular grid. This paper summarizes several ways on coordination control in micro-grid and introduces some domestic researches on micro-grid control strategies. It is written on the basis of the achievements on micro-grid control in some developed countries and current situations on domestic micro-grid control....

In this paper, the stability of a functionally graded magneto-electro-elastic (FG-MEE) micro-beam under actuation of electrostatic pressure is studied. For this purpose Euler-Bernoulli beam theory and constitutive relations for magneto-electro-elastic (MEE) materials have been used. We have supposed that material properties vary exponentially along the thickness direction of the micro-beam. Gov...

As a new form of social media, micro-blogging marketing has became a new choice to more enterprises. At present, Marketers confuse on how to measure and analyze micro-blogging marketing results. According to combine with current situation of micro-blogging operations, The study propose a model for measuring enterprise micro-blogging marketing results based on DAGMAR model. While, methods for me...

The goal of this chapter is to show how certain results in the study of quantum chaos can be used for the design of highly directional emission semiconductor micro lasers and resonant multi-cavities. For this, we first review some basic tools of chaos theory in classical mechanics, focusing on planar billiards (two-dimensional cavities). After pointing out that under certain conditions electrom...

This paper details the development and preliminary testing of a system for 6-DOF human-machine cooperative motion using visionbased virtual xtures for applications in retinal micro-surgery. The system makes use of a calibrated stereo imaging system to track surfaces in the environment, and simultaneously tracks a tool held by the JHU Steady-Hand Robot. As the robot is guided using force inputs ...

A novel Fourier spectrometer using thin film technology was developed. The spectrometer based on a semi transparent thin film detector in combination with a tunable micro machined mirror. The semi transparent detector is introduced into a standing wave created in front of the mirror to sample the profile of the standing wave. Varying the position of the mirror results in a shift of the phase of...

With the growth of Internet, “always on” services are becoming increasingly important. Software rejuvenation is a well-known proactive technique to prevent failures due to software aging and extend the lifetime of longrunning software such as Internet Servers, billing systems, telecommunication switches [1]. However, doing a machine reboot to rejuvenate takes time in the order of minutes and ca...