3,135 research outputs found
Comparison Study of Biosignal based Computer Interfaces Based on Fitts’ Law Paradigm
No full textThis paper presents development of two different biosignal based computer interfaces for people with motor disabilities: 1) electromyography (EMG)-based computer interface (ECI) and 2) hybrid EMG-based computer interface (HECI). The ECI made both movements of a cursor and clicking from muscle contractions induced by volitional wrist movements. On the other hand, the HECI made movements of a cursor from the lower arm movements under a motion capture camera, and clicking from muscle contractions induced by volitional movements of index and middle fingers. These interfaces were tested by the experiments based on a Fitts’ law paradigm in order to provide object evaluation of the interfaces. These results were also compared to a commercial brain computer interface was evaluated under the same test setup
A CMOS frequency synthesizer block for MB-OFDM UWB systems
No full textA CMOS frequency synthesizer block for multi-band orthogonal frequency division multiplexing ultra-wideband systems is proposed. The proposed frequency synthesizer adopts a double-conversion architecture for simplicity and to mitigate spur suppression requirements for out-of-band interferers in 2.4 and 5 GHz bands. Moreover, the frequency synthesizer can consist of the fewest nonlinear components, such as divide-by-Ns and a mixer with the proposed frequency plan, leading to the generation of less spurs. To evaluate the feasibility of the proposed idea, the frequency synthesizer block is implemented in 0.18-mu m CMOS technology. The measured sideband suppression ratio is about 32 dBc, and the phase noise is -105 dBc/Hz at an offset of 1 MHz. The fabricated chip consumes 17.6 mA from a 1.8 V supply, and the die-area including pads is 0.9 x 1.1 mm(2)
Experimental Prediction of Shock Response Spectra of Point-wise Explosive Pyroshock in a Space Launcher Composite Structure using Laser Pulse Excitation and In-Line Filtering
No full textOrganic Emitting-plasmon Coupling in a Thin Film using Thermally-evaporated Ag Nanocluster layer and its
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Cw ion lasers pumped by electron beams
No full textWe have obtained cw laser radiation from singly ionized Hg, I, Cd, Se, and As by exciting He metal-vapor mixtures with a dc electron beam. The beam is generated by glow discharge electron guns located apart from the active medium. This is the first time that cw ion laser action has been obtained using electron beam excitation
CW laser action in atomic fluorine
No full textWe have obtained CW laser action on four transitions in the doublet system of atomic fluorine for the first time. All previously reported laser action was on a pulsed basis only. CW laser radiation was obtained when F2 or AgF was used as a fluorine donor in an electron beam pumped helium plasma. A multiline output power of 200 mW was obtained
CW silver ion laser with electron beam excitation
No full textA CW laser power of 140 mW was obtained in the 840.39 nm transition of Ag II by electron beam excitation. This electron beam excited metal vapor ion laser is capable of operating using metals with high vaporization temperatures and is of interest for generation of CW coherent radiation in the 220-260 nm spectral region
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