This paper investigates the effect of the variation of duty ratio on the different performance parameters of the three non-isolated dc-dc converters namely buck, boost and buck-boost converter. Five important parameters dependent on the duty ratio have been identified namely output voltage, output current, effective impedance at the input, minimum inductance and minimum capacitance for continuo...

Separation of duty constraints define mutual exclusion relations between two entities (e.g. two permissions). Thus, a software component that supports the definition of separation of duty constraints implicitly requires a means to control their definition and to ensure the consistency of the resulting runtime structures. In this paper, we present our experiences with the implementation of confl...

The capacity of servicemembers with amputation to return to duty after combat-related amputation and the associated disabilities remains largely unknown. The purpose of this study was to examine the disabling conditions and return to duty rates of servicemembers with amputation across all service branches following major limb amputations from September 2001 through July 2011. Pertinent medical ...

OBJECTIVE We assessed the relationship between active duty status and daily insufficient sleep in a telephone survey. METHODS U.S. military service status (recent defined as past 12 months and past defined as >12 months ago) and daily insufficient sleep in the past 30 days were assessed among 566,861 adults aged 18 to 64 years and 271,202 adults aged ≥ 65 years in the 2009 to 2010 Behavioral ...

The digital PWM modulator circuit is capable of varying the duty cycle of the output (PWM) according to the digital input word. A digitally controlled current starved pulse width modulator is described. The current from the power grid to the ring oscillator is controlled by a header circuit. By changing the header current, the pulse width of the switching signal generated at the output of the r...

A previous article in this Journal surveyed a psychotherapist’s legal duty to warn third parties of violent threats made by a patient. Twenty-seven states impose an actual duty to warn (as did the seminal case of Tarasoff v. The Regents of the University of California itself ): Arizona, California, Colorado, Delaware, Idaho, Indiana, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Minne...

In High speed operations the duty cycle of the clock signal is to bé calibrated at 50%. But the variations in process, voltage and temperature (PVT) influences the duty cycle and make it difficult to calibrate the duty cycle at 50%. To overcome this deviation Pulse width control loops (PWCLs) are used. This work presents a high performance and fast locking all digital pulse width control circui...

Coexistence of Wi-Fi and LTE in unlicensed spectrum (LTE-U) is recently drawing significant concern in industry. In this paper, we investigate the Wi-Fi performance in the presence of duty cycle based LTE-U transmission on the same channel. More specifically, one LTE-U cell and one Wi-Fi basic service set (BSS) coexist by allowing LTE-U devices transmit their signals only in predetermined duty ...