نتایج جستجو برای: dynamic and deterministic states dds
تعداد نتایج: 16950258 فیلتر نتایج به سال:
A scheme of frequency hopping spread spectrum (FHSS) frequency synthesizer suitable for synthesis of radio-frequency (RF) carrier signal in very high frequency (VHF) band is proposed, implemented and tested. The synthesizer is based on the direct digital frequency synthesis (DDFS or DDS) and phase locked loop (PLL) with dynamic monitoring of varicap’s voltage to reduce switching time. The resul...
all analytical methods are generally based on the measurement of a parameter or parameters which are somehow related to the concentration of the species.an ideal analytical method is one in which the concentration of a species can be measured to a high degree precision and accuracy and with a high sensitivity. unfortunately finding such a method is very difficult or sometimes even impossible.in...
Assuring end-to-end QoS in enterprise distributed real-time and embedded (DRE) systems is hard due to the heterogeneity and transient behavior of communication networks, the lack of integrated mechanisms that schedule communication and computing resources holistically, and the scalability limits of IP multicast in wide-area networks (WANs). This paper makes three contributions to research on ov...
the images of muslims in media, literature and politics have been mostly black and white portrayals of a people alien to modernity, civilization, rationality and pluralism. since the end of the cold war and the onset of deadly terrorist attacks in different areas of the world, especially in the united states, these representations show a palpable difference: muslims are represented not only as ...
Developmental disabilities (DDs) are chronic conditions that initially manifest in persons aged < or =18 years and result in impairment of physical health, mental health, cognition, speech, language, or self-care. The majority of persons with DDs require long-term supportive care or services. In 2003, RTI International (Research Triangle Park, North Carolina) and CDC analyzed data from multiple...
In this paper we solve a finite-horizon partially observed risk-sensitive stochastic optimal control problem for discrete-time nonlinear systems and obtain small noise and small risk limits. The small noise limit is interpreted as a deterministic partially observed dynamic game, and new insights into the optimal solution of such game problems are obtained. Both the risk-sensitive stochastic con...
Texting and other cell-phone related distracted driving is estimated to account for thousands of motor vehicle collisions each year but studies examining the specific cell phone reading and writing activities of drivers are limited. The objective of this study was to describe the frequency of cell-phone related distracted driving behaviors. A national, representative, anonymous panel of 1211 Un...
This paper presents a 12 GHz direct digital synthesizer (DDS) MMIC with 9-bit phase and 8-bit amplitude resolution implemented in a 0.18 m SiGe BiCMOS technology. Composed of a 9-bit pipeline accumulator and an 8-bit sine-weighted current-steering DAC, the DDS is capable of synthesizing sinusoidal waveforms up to 5.93 GHz. The maximum clock frequency of the DDS MMIC is measured as 11.9 GHz at t...
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