Many applications, including communications, test and measurement, and radar, require the generation of signals with a high degree of spectral purity. One method for producing tunable, low-noise signals is to combine the outputs of multiple direct digital synthesizers (DDSs) arranged in a parallel configuration. In such an approach, if all noise is uncorrelated across channels, the noise power ...

This paper proposes Design and Implementation of CORDIC algorithm for Direct Digital Synthesizer. COordinate Rotation DIgital Computer (CORDIC) algorithm is an interesting technique for phase to sine amplitude conversion. The algorithm proposed in this design is to utilize dynamic transformation rather than ROM static addressing. The proposed CORDIC design is based on Pipeline data path Archite...

In this paper the development of mathematical model of voltage-input and current-input active magnetic bearing (AMB) system in deterministic form is presented. The AMB system, which is open-loop unstable and highly coupled due to nonlinearities inherited in the system such as gyroscopic effect and mass imbalance, requires a dynamic controller that can stabilize the system. In order to synthesiz...

rangeland ecosystems shift across dynamic thresholds between differentecological states in response to natural or human-induced factors. these differentecological states are the result of interactions among climate, soils, grazing history,and management practices. the notion of a single ‘‘pristine’’ final state is onlyconceptual in nature, and because of this, dynamic thresholds and the effects...

OBJECTIVE Dopamine dysregulation syndrome (DDS) refers to a compulsive pattern of dopaminergic drug misuse complicating Parkinson's disease (PD). To date, few data are available on DDS risk factors, cognitive profile and long-term outcome. METHODS In this retrospective case-control study, consecutive PD outpatients fulfilling criteria for DDS were assessed over a 6-year period (2005-2011). Th...

OBJECTIVE Impulse control disorders (ICDs) and dopamine dysregulation syndrome (DDS) are important behavioral problems that affect a subpopulation of patients with Parkinson's disease (PD) and typically result in markedly diminished quality of life for patients and their caregivers. We aimed to investigate the effects of subthalamic nucleus (STN) and internal globus pallidus (GPi) deep brain st...

OBJECTIVE To evaluate the safety and efficacy of an intraocular biodegradable polymer dexamethasone drug delivery system (DEX DDS) in treating postoperative inflammation after cataract surgery. STUDY DESIGN Multicenter, randomized, double-masked, parallel group study comparing two dose levels of the DEX DDS to concurrent placebo and no treatment control subjects. PARTICIPANTS Ninety patient...

We provide a framework for the design and analysis of dynamic programming algorithms for H-minor-free graphs with branchwidth at most k. Our technique applies to a wide family of problems where standard (deterministic) dynamic programming runs in 2O(k·log k) · n steps, with n being the number of vertices of the input graph. Extending the approach developed by the same authors for graphs embedde...