This paper describes a micro-force sensing device where a H-infinity control scheme is used to actively balance the external force and provide the measurement. The force sensing principle is based on the active control of the electrostatic bipolar actuator (comb-drive) within the sensor. An external load force acts on the sensor and displaces the probe. The controller is set to balance the appl...

When indexing large text collections minimizing the indexing time and the disk storage used to create an index remains important. Indexing optimizations applied to a prototype retrieval system at NIST are discussed in this paper. These include the organization of the index, the use of virtual memory facilities to improve indexing time, an index addressing scheme to decrease index size, and the ...

One of the bio-sensing mechanisms is mechanical. Rather than measuring shift in resonance frequency, we adopt to measure the change in spring constant due to adsorption, as one of the fundamental sensing mechanism. This study explains  determination of spring constant of a surface functionalized micro machined micro cantilever, which resonates in a trapezoidal cavity-on Silicon wafer, with the ...

One of the bio-sensing mechanisms is mechanical. Rather than measuring shift in resonance frequency, we adopt to measure the change in spring constant due to adsorption, as one of the fundamental sensing mechanism. This study explains  determination of spring constant of a surface functionalized micro machined micro cantilever, which resonates in a trapezoidal cavity-on Silicon wafer, with the ...

While compressive sensing (CS) has been one of the most vibrant research fields in the past few years, most development only applies to linear models. This limits its application in many areas where CS could make a difference. This paper presents a novel extension of CS to the phase retrieval problem, where intensity measurements of a linear system are used to recover a complex sparse signal. W...

—Touch sensing, as a major human/machine interface, is widely used in various commercial products such as smart watches, mobile phones, tablets and TVs. State-of-the-art touch detections are mainly based on mutual capacitive sensing, which requires necessary contact-touch, limiting the mobile user experience. Recently, remote gesture sensing is widely reported in both academy and industry as it...

In the recently-suggested dynamic spectrum allocation policy of cognitive radio networks [1]–[3], sensing/monitoring of spectrum availability is identified as a key requirement. To meet this requirement we address an important MAC-layer sensing issue: which of proactive and reactive sensing is more energy-efficient? An algorithm is proposed to dynamically determine which sensing mode to use. Fo...

This paper discusses the design and fabrication of a prototype MEMS microactuator and vibration sensors, and controller design for suspension vibration compensation in disk drives. The microactuator utilizes parallel-plates actuation and comb-finger position sensing. An electrical isolation MEMS fabrication technique is utilized to increase the actuation force. An LQG method is proposed for vib...

Cooperative Spectrum Sensing (CSS) has been proposed as a solution to increase accuracy of spectrum sensing in a Cognitive Radio Network (CRN), but with a few exceptions the design and performance evaluation of CSS schemes has focused so far on static networks, neglecting the role and potential impact of terminals mobility, in conjunction with channel spatio-temporal correlation. This work addr...