In the layout design of analog integrated circuits, common centroid constraints can effectively reduce parasitic mismatch and thermal gradients, which may otherwise degrade circuit performance. In this paper, we first survey the frontline research of common-centroid-aware layout placement algorithms and implement a graph-based packing approach to handle common centroid constraints in the analog...

S U M M A R Y We determine centroid-moment tensor (CMT) solutions by minimizing waveform differences between observed and simulated seismograms based on an adjoint method. Synthetic seismograms and Fréchet derivatives are calculated based on a spectral-element method. The non-linear adjoint CMT inversion algorithm requires three simulations for each iteration: one ‘forward’ simulation to obtain...

The method of centroids is an approach to the analysis of three-dimensional whole-brain positron emission tomography (PET) metabolic images. It utilizes the brain's geometric centroid and metabolic centroid so as to objectively characterize the central tendency of the distribution of metabolic activity in the brain. The method characterizes the three-dimensional PET metabolic image in terms of ...