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BACKGROUND Health professional schools are responsible for producing graduates with competencies and attitudes to address health inequities and respond to priority health needs. Health professional schools striving towards social accountability founded the Training for Health Equity Network (THEnet). AIM This article describes the development of THEnet(More)
In this paper, a hardware equivalent of an organic light-emitting diode (OLED) was designed and investigated. This substitution OLED device is based on a circuit-equivalent OLED model and can be used to design and test OLED dedicated drivers. Indeed, OLEDs are available on the market, but they are still very expensive and hard to obtain. Compared to a real(More)
In this paper, we demonstrate how driving current affects photometric performances of a white light organic light emitting diode (OLED) for general lighting purpose. Experiments reveal that a ripple current with 40% amplitude, 50-Hz-100-kHz frequency, and sinusoidal and triangle waveform has little influence on the test OLED. In the pulse-width modulation(More)
We have developed a 3D model, based on the resolution of the propagation of acoustic waves, in the real geometry of the lamp burner. This model provides the frequency spectrum of the different modes which can take place in the lamp. It helps in the understanding of the coupling between the acoustic modes and the arc geometry. Especially, it has shown that(More)
Fluorescent lamps operated on low frequency AC (50 Hz or 60 Hz) might present striated instability especially when ambient temperature is low. Experimental results reveal that moving striations are not due to the disturbances in the electrode region; rather, they have a very close relation with cold spot temperature of the tube. When a non-striated tube is(More)
This paper presents an organic light-emitting diode (OLED) equivalent circuit model with a temperature coefficient and an intrinsic capacitor. In order to precisely describe the OLED nonlinear V-I characteristic at different ambient temperatures, four parameters, i.e., the maximum operating point, the rated operating point, the knee point, and the(More)
This paper presents a bidirectional OLED buck driver with the proposed variable-frequency control mechanism. The bulky parasitic capacitor of the OLED causes the significant delay on the dimming response of the OLED. Therefore, the bidirectional OLED buck driver with the variable-frequency control mechanism is proposed to increase the dimming response.(More)
We have implemented a predictive experimental tool to determine fluorescent lamp lifetime according to its operating conditions. This tool, based on an electrical measurement, provides an indication of the physical state of fluorescent lamps electrodes (hot cathodes). It may be used to shorten lifetime test and therefore to get a faster evaluation of the(More)
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