A control system for controlling a refrigeration system having an operating point, comprising: a memory configured to store a relationship of at least an evaporator efficiency, an evaporator heat load, a refrigerant amount in the evaporator, and a variable dependent on a non-volatile liquid mixed with refrigerant in the evaporator an input port configured to receive a signal corresponding to at least a measured evaporator heat load during operation; an output port configured to present an output to selectively alter an operating point of the evaporator, by altering the refrigerant amount in the evaporator and thereby changing the variable; and a processor, configured to receive the signal, access the memory; and generate the output to selectively move toward an optimum operating point. A corresponding method and refrigeration system are provided.

Method and apparatus for optimizing refrigeration systems

In accordance with the teachings described herein, systems and methods are provided for analyzing transactional data. A similarity analysis program may be used that receives time-series data relating to transactions of an organization and performs a similarity analysis of the time-series data to generate a similarity matrix. A data reduction program may be used that receives the time-series data and performs one or more dimension reduction operations on the time-series data to generate reduced time-series data. A distance analysis program may be used that performs a distance analysis using the similarity matrix and the reduced time-series data to generate a distance matrix. A data analysis program may be used that performs a data analysis operation, such as a data mining operation, using the distance matrix to generate a data mining analysis of the transactional data.

Systems and methods for mining transactional and time series data

Computer-implemented systems and methods for processing time series data that is indicative of a data generation activity occurring over a period of time. A model specification hierarchical data structure is used for storing characteristics that define a time series model. A fitted model hierarchical data structure stores characteristics that define a fitted time series model. The characteristics of the fitted time series model are defined through an application of the time series model to the time series data.

Computer-implemented system and method for storing data analysis models

A computer-implemented method and system for large-scale automatic forecasting. The method and system determine which forecasting models in a pool of forecasting models may best predict input transactional data. Candidate models are selected from the pool of forecasting models by comparing characteristics of the models in the pool with characteristics of the input transaction data. To further reduce the number of models, hold-out sample analysis is performed for the candidate models. The candidate model(s) that best perform with respect to the hold-out sample analysis are used to generate forecasted output.

System and method for large-scale automatic forecasting

Systems and methods are provided for evaluating performance of forecasting models. A plurality of forecasting models may be generated using a set of in-sample data. Two or more forecasting models from the plurality of forecasting models may be selected for use in generating a combined forecast. An ex-ante combined forecast may be generated for an out-of-sample period using the selected two or more forecasting models. The ex-ante combined forecast may then be compared with a set of actual out-of-sample data to evaluate performance of the combined forecast.

Computer-Implemented Systems and Methods for Testing Large Scale Automatic Forecast Combinations

A method and apparatus that utilize time-domain measurements of a nonlinear device produce or extract a behavioral model from embeddings of these measurements. The method of producing a behavioral model comprises applying an input signal to the nonlinear device, sampling the input signal to produce input data, measuring a response of the device to produce output data, creating an embedded data set, fitting a function to the embedded data set, and verifying the fitted function. The apparatus comprises a signal generator that produces an input signal that is applied to the nonlinear device, the device producing an output signal in response. The apparatus further comprises a data acquisition system that samples and digitizes the input and output signals and a signal processing computer that produces an embedded data set from the digitized signals, fits a function to the embedded data set, and verifies the fitted function.

Method and apparatus for extraction of nonlinear black-box behavioral models from embeddings of the time-domain measurements

A method and apparatus precondition an analog signal and convert the preconditioned signal into a digital representation. The method includes preconditioning the analog signal, generating a quantity N of reference signals, comparing an amplitude of the preconditioned signal to an amplitude of the reference signals to determine whether the preconditioned signal amplitude is greater than, less than or equal to reference signal amplitudes, and producing a timestamp at a time that the preconditioned signal and reference signal amplitudes are equal. The apparatus includes a preconditioner, a reference signal generator and a quantity N of comparators. A comparator of the quantity N of comparators receives the preconditioned signal from the preconditioner, separately receives a reference signal, and produces a digital signal. The preconditioned signal or the analog signal may be reconstructed from the digital representation.

Signal preconditioning for analog-to-digital conversion with timestamps

A method and apparatus converts an analog signal into a digital representation The method comprises the steps of generating a quantity N of time-varying reference signals, where N is an integer greater than or equal to one, comparing an amplitude of the analog signal to an amplitude of each of the reference signals to determine whether the analog signal amplitude is greater than, less than or equal to reference signal amplitudes, and producing a timestamp each time the analog signal and reference signal amplitudes are equal The apparatus comprises a reference signal generator and a quantity N of comparators, each of the comparators being connected to receive the analog signal, separately to receive a different one of the reference signals, and to produce a digital signal The analog signal may be reconstructed from the digital representation

Method and apparatus for analog to digital conversion using time-varying reference signal

Ein Verfahren und eine Vorrichtung wandeln ein analoges Signal in eine digitale Darstellung um. Das Verfahren weist die Schritte des Erzeugens einer Quantitat N von zeitvariierenden Referenzsignalen auf, wenn N eine Ganzzahl groser als oder gleich 1 ist, des Vergleichens einer Amplitude des analogen Signals mit einer Amplitude von jedem der Referenzsignale, um zu bestimmen, ob die analoge Signalamplitude groser als, kleiner als oder gleich den Referenzsignalamplituden ist, und des Erzeugens eines Zeitstempels, jedesmal, wenn das analoge Signal und die Referenzsignalamplituden gleich sind. Die Vorrichtung weist einen Referenzsignalgenerator und separat eine Quantitat N von Komparatoren auf, wobei jeder der Komparatoren verbunden ist, um das analoge Signal zu empfangen, um ein unterschiedliches der Referenzsignale zu empfangen und um ein digitales Signal zu erzeugen. Das analoge Signal kann aus der digitalen Darstellung rekonstruiert werden.

Verfahren und Vorrichtung zur Analog-Digitalumwandlung unter Verwendung eines zeitvariierenden Referenzsignals

Verfahren (100) zum Umwandeln eines analogen Signals (S) in eine digitale Darstellung, wobei das Verfahren (100) folgende Schritte aufweist: The method (100) for converting an analog signal (S) into a digital representation, the method (100) comprising the steps of: Erzeugen (110) einer Quantitat N von zeitvariierenden Referenzsignalen, deren Amplitudenwerte eine vorbekannte Funktion der Zeit sind, wenn N eine Ganzzahl groser als 1 ist; Generating (110) a quantity of N time-varying reference signals, the amplitude values ​​are previously known a function of time, when N is an integer greater than 1; Vergleichen (120; 120') einer Amplitude des Analogsignals mit einer Amplitude von jedem Referenzsignal, um zu bestimmen, ob die Analogsignalamplitude groser als, kleiner als oder gleich jeder Referenzsignalamplitude ist; Comparing (120; 120 ') of an amplitude of the analog signal with an amplitude of each reference signal to determine whether the analog signal amplitude is greater than, less than or equal to any reference signal amplitude; und and Erzeugen (130, 130') eines Zeitstempels, wenn die Analogsignalamplitude gleich der Amplitude von jedem Referenzsignal ist, wobei jeder Zeitstempel der Zeit des Auftretens eines Amplitudengleichheitsereignisses entspricht, und wobei die digitale Darstellung ein Satz von Zeitstempeln ist. Generating (130, 130 ') a time stamp when the analog signal amplitude is equal to the amplitude of each reference signal, wherein each time stamp of the time of occurrence of amplitude equality event, and wherein the digital representation is a set of time stamps.

Verfahren und Vorrichtung zur Analog-Digitalumwandlung unter Verwendung eines zeitvariierenden Referenzsignals Method and apparatus for analog to digital conversion using a time-varying reference signal

Linda Argon Kamas

Papers

Method and apparatus for extraction of nonlinear black-box behavioral models from embeddings of the time-domain measurements

Signal preconditioning for analog-to-digital conversion with timestamps

Method and apparatus for analog to digital conversion using time-varying reference signal

Verfahren und Vorrichtung zur Analog-Digitalumwandlung unter Verwendung eines zeitvariierenden Referenzsignals

Verfahren und Vorrichtung zur Analog-Digitalumwandlung unter Verwendung eines zeitvariierenden Referenzsignals Method and apparatus for analog to digital conversion using a time-varying reference signal