Abstract: A multi-mode interference (MMI) device includes a substrate layer, a core layer grown on the substrate layer for propagating an optical signal, and a cladding layer grown on the core layer for guiding the optical signal. The MMI device also includes a non-uniform pattern of patches forming a non-uniform refractive index distribution within the MMI device.

Abstract: A device includes a source and a drain for transmitting and receiving an electronic charge. The device also includes a first stack and a second stack for providing at least part of a conduction path between the source and the drain, wherein the first stack includes a first gallium nitride (GaN) layer of a first polarity, and the second stack includes a second gallium nitride (GaN) layer of the second polarity, and wherein the first polarity is different from the second polarity. At least one gate operatively connected to at least the first stack for controlling a conduction of the electronic charge, such that, during an operation of the device, the conduction path includes a first two-dimensional electron gas (2DEG) channel formed in the first GaN layer and a second 2DEG channel formed in the second GaN layer.

Abstract: A signal is reconstructed by first producing complex-valued measurements of the signal by measuring the signal using a linear complex measurement system, and retaining only a phase of the complex-valued measurements. Then, the signal is reconstructed from the phase of the complex measurements within a scaling factor using a sparse reconstruction method.

Abstract: Source signals emitted in a reverberant environment from different locations are processed by first receiving input signals corresponding to the source signals by a set of sensors. Then, a sparsity-based support estimation is applied to the input signals according to a reverberation model to produce estimates of the source signals and locations of a set of sources emitting the source signals.

Abstract: Power flow in an electric power network is optimized during multiple time periods of operation of the electric power network by solving an optimization problem represented by an objective function by first initializing variables and constraints of a branch and bound (BB) tree, wherein nodes in the BB tree represent feasible regions of the optimization problem. Upper and lower bounds on the objective function are solved using the BB tree. A lowest upper bound and a lowest upper bound are updated. If difference between the lowest lower bound and the lowest upper bound is less than a threshold, the power flow is outputted based on the lowest lower bound and the lowest upper bound.

Abstract: A method determines a location of a single-phase-to-ground fault in an ungrounded power distribution system. The method detects the faulty phase of the distribution system having the fault and compares a difference between an angle of a voltage and an angle of a current measured at a root of a faulty feeder and boundaries of each section of the faulty feeder to determine a faulty section of a faulty feeder having the fault. A line segment of the faulty section is tested for a change of a sign of a voltage on the faulty phase in the faulty section to determine a faulty line segment. The location of the fault is determined based on a distance from a terminal bus of the faulty line segment to a location along the faulty line segment having a value the voltage on the faulty phase equals zero.

Abstract: Four-dimensional (4D) computed tomography (CT) is simulated by first generating a surface mesh from a single thoracic CT scan. Tetrahedralization is applied to the surface mesh to obtain a first volume mesh. Finite element analysis, using boundary constraints and load definitions, is applied to the first volume mesh to obtain a lung deformation according to an Ogden model. Constrained tetrahedralization, using control points, is applied to the lung deformation to obtain a second volume mesh, which is then deformed using mass-spring-damper simulation to produces the 4DCT.

Abstract: An input segment of an input video is encoded by first extracting and storing, for each segment of previously encoded videos, a set of reference features. The set of input features are matched with each set of the reference features to produce a set of scores. The reference segments having largest scores are selected to produce a first reduced set of reference segments. A rate-distortion cost for each reference segment in the first reduced set of reference segments is estimated. The reference segments in the first reduced set of reference segments is selected to produce a second reduced set of reference segments. Then, the input segment are encoded based on second reduced set of reference segments.

Abstract: A node includes a receiver for receiving a first packet from a first node at a first time and a second packet from a second node at a second time, a processor for determining the first time and the second time and for comparing the first time with the second time to produce a ratio of workloads of the first node and the second node, and a transmitter for transmitting packets to the first and the second nodes based on the ratio.

Abstract: Videos of a scene are processed for view synthesis. The videos are acquired by corresponding cameras arranged so that a view of each camera overlaps with the view of at least one other camera. For each current block, motion or disparity vector is obtained from neighboring blocks. A depth block is based on a corresponding reference depth image and the motion or disparity vector. A prediction block is generated based on the depth block using backward warping of a motion field. Then, predictive coding for the current block using the prediction block. Backward mapping can also be performed in the spatial domain.

Abstract: Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a metamaterial arranged within the EM near-field such that the coupling is enhanced.

Abstract: Distances between data are encoded by per a random projection, followed by dithering and scaling, with a fixed scaling for all values. The resulting dithered and scaled projection is quantized using a non-monotonic 1-bit quantizer to form a vector of bits representing the signal. The distance between signals can be approximately calculated from the corresponding vectors of bits by computing the hamming distance of the two vectors of bits.

Abstract: A scene is reconstructed by receiving pulses transmitted by a virtual array of transducers. The pulses are reflected by the scene. The virtual array has a set of configurations subject to positioning errors. Each received pulse is sampled and decomposed to produce frequency coefficients stacked in a set of linear systems modeling a reflectivity of the scene. There is one linear system for each configuration. A reconstruction method is applied to the set of linear systems. The reconstruction method solves each linear system separately to obtain a corresponding solution. The corresponding solutions share information during the solving. Then, the solutions are combined to reconstruct the scene.