Abstract: A method includes performing, by a terminal with an access card, a first relay attack check for the access card in accordance with a local value associated with the terminal and a local value associated with the access card; determining, by the terminal, that the access card has passed the first relay attack check, and based thereon, performing, by the terminal with the access card, an authentication check of the access card in accordance with the local value associated with the terminal, the local value associated with the access card, and a local challenge value associated with the terminal; and determining, by the terminal, that the access card has passed the first relay attack check and the authentication check, and based thereon, validating, by the terminal, the access card.

Abstract: A method includes identifying, based on sensor data received by a motion sensor, a physical activity performed by a user of the computing system during a time period and determining whether the user consumed media during the time period that the user performed the physical activity. The method also includes responsive to determining that the user consumed the media during the time period that the user performed the physical activity, determining, based on data indicative of the media consumed by the user, an updated physical activity performed by the user during the time period; and outputting data indicating the updated physical activity.

Abstract: The present technology is directed to easily and more accurately acquiring output signals relating to a plurality of inertial sensors. Provided is an information processing device including a combining unit that stepwisely combines output signals relating to a plurality of inertial sensors, in which the combining unit clusters a plurality of the output signals into a plurality of clusters and stepwisely combines the output signals in each of the clusters, and at least one of the clusters includes a plurality of the output signals. Furthermore, provided is an information processing method including stepwisely combining, by a processor, output signals relating to a plurality of inertial sensors, in which the combining further includes clustering a plurality of the output signals into a plurality of clusters and stepwisely combining the output signals in each of the clusters, and at least one of the clusters includes a plurality of the output signals.

Abstract: A method is described for determining the state of a vehicle equipped with an electric charge accumulator assembly adapted to power at least one starter device of a thermal engine and/or accessory devices of the vehicle and rechargeable by means of the kinetic energy of said engine, including the detection of the voltage available across the electric charge accumulator assembly of the vehicle in a predetermined succession of moments in time; at least one binary classification of the voltage value available across the accumulator assembly by comparison with a reference voltage value; and the determination of the operating state of the vehicle as a function of the outcome of the binary classification of the value of the voltage available across the accumulator assembly.

Abstract: Disclosed is a medical data processing method for determining an indicator relating to an injury of an anatomical structure (1) of a patient, wherein the method comprises executing, on at least one processor (5) of at least one computer (3), steps of: a) acquiring (S1) acceleration data describing an energy of a set of one or more signals in dependence on both time and frequency, the set of signals acquired by measuring the acceleration of the anatomical structure (1) over time; b) acquiring (S2) analysis data describing an analysis rule for determining at least one of b1) an overall energy level of at least one signal of the set of signals, b2) a correlation between at least two signals of the set of signals in the frequency domain, the at least two signals respectively measured at at least two different respective regions of the anatomical structure (1), or b3) a relationship between energies given for at least two different frequency ranges of at least one signal of the set of signals; c) determining (S3)

Abstract: In accordance with an aspect of the present disclosure there is provided an interactive system. The interactive system may include communication medium between a user and a computer rendered environment. The interactive system may include an image rendering unit to render any of the computer rendered environment. The interactive system may include a sensory signal generating unit providing, to the user, one or more sensory signals. The interactive system may include a sensory response processing unit as a body monitoring unit configured to time provisions of the sensory signals and to acquire/process one or more sensory responses of the user to the sensory signals.

Abstract: This measurement device for measuring the angular velocity or acceleration of a two-wheel vehicle, is provided with a main detection unit which detects the three-axis angular velocity or three-axis acceleration, a support unit which can support the main detection unit on the body of the two-wheel vehicle, and a correction unit which cancels the lean of the body to the left and right in the main detection unit.

Abstract: A control may obtain first data related to a plurality of positions of an implement of a work machine during a first time period and may determine, based on the first data, a first noise value related to at least one velocity of the implement for the first time period. The control device may obtain second data related to a plurality of positions of the implement during a second time period and may determine, based on the second data, a second noise value related to at least one velocity of the implement for the second time period. The control device may determine, based on the first noise value and the second noise value, a start of motion of the implement. The control device may cause, based on determining the start of motion of the implement, the implement to be calibrated.

Abstract: Methods for controlling an aspect of an application in a mobile or wearable device and a mobile or wearable device user's representation in real time are described, where the user is performing a gait activity with a gait cadence, and the gait cadence is used for control. Additional user's mobility characteristics leveraged for control may include velocity and stride length, and the sensors utilized to obtain any contextual information may be accelerometers.

Abstract: A numerical controller is provided with a control unit configured to control a machine tool and acquire feedback data in relative positions of a tool and a workpiece, a machining simulation unit configured to perform simulation processing for machining based on a machining program and create the shape of the machined workpiece, and a display unit configured to display the machined workpiece shape created by the machining simulation unit. The machining simulation unit performs machining simulation processing using the feedback data acquired by the control unit, in place of relative movement paths for the tool and the workpiece based on a command by the machining program.

Abstract: A system and method for controlling compressor inlet guide vanes of a gas turbine engine in an aircraft includes supplying, to a compressor inlet guide vane control algorithm, an inlet temperature value that is at least representative of sensed engine inlet total temperature. One or more gas turbine engine parameters are sensed with one or more sensors during operation of the gas turbine engine. The one or more gas turbine engine parameters are processed in the engine control unit to determine an inlet temperature modifier value that is an estimate of a difference between the sensed engine inlet total temperature and actual engine inlet total temperature. The inlet temperature modifier value is added to the inlet temperature value to derive a modified engine inlet total temperature. The modified engine inlet total temperature is used in the compressor inlet guide vane control algorithm, which controls the compressor inlet guide vanes.

Abstract: A method for managing smart alarms in an electrical system includes processing electrical measurement data from or derived from energy-related signals captured or derived by at least one intelligent electronic device of a monitoring and control system to identify at least one of power events in the electrical system, or alarms triggered in response to any identified power events. Information related to the identified power events and the identified alarms may be aggregated, and relevant event and/or alarm management groups and/or relevant event and/or alarm periods may be identified from the aggregated information. One or more actions may be triggered, avoided or avoid triggering in response to the identified event management groups and/or the identified event and/or alarm periods. Systems for managing smart alarms are also provided herein.

Abstract: A computing device and method for reducing memory usage in a runtime. The method is performed in a computer system having a non-volatile memory (ROM) containing initial states of objects for the runtime and volatile memory (RAM). An alias table in RAM is accessed corresponding with an object in ROM. If the there is an alias referenced in RAM, then computation is performed upon the alias rather than the object in ROM. Otherwise, if there is no alias then computation is performed upon the one in ROM. If the object is required to be updated, then it is stored as an alias referenced by the alias table stored in RAM.

Abstract: Systems and methods are provided for planning a procedure. A display device is configured to display a first virtual element. A controller device having a processor is configured to be in communication with the display device, and the controller device is further configured to direct the display device to display the first virtual element. A physical control element is in communication with the controller device, and is configured to correspond to the first virtual element such that an actual manipulation of the control element is displayed, via the processor of the controller device and on the display device, as a corresponding response of the first virtual element to the actual manipulation of the control element. Associated systems, methods, and computer program products are also provided.

Abstract: A method of providing gait coaching is disclosed. Run data is received and stored regarding runs of a broad and diverse population of users, as well as a more narrow set of expert users. A gait metric model is developed for determining an ideal stride length or cadence based on pace and at least one physiological characteristic. Regression coefficients for at the model are determined based on a regression of the run data from the broad and diverse population of users. In contrast, a regression constant for the model is determined based on a regression of the run data from expert users. Using the model, an ideal stride length or cadence for a particular user on a particular run can be determined and utilized to provide useful monitoring, comparison, and feedback to the user regarding his or her stride length or cadence.

Abstract: The described technology regards an augmented reality system and method for estimating a position of a location of interest relative to the position and orientation of a display, including receiving and selectively filtering a plurality of measurement vectors from a rate-gyroscope. Systems of the described technology include including a plurality of sensors, a processing module or other computation means, and a database. Methods of the described technology use data from the sensor package useful to accurately render graphical user interface information on a display.

Abstract: Systems and methods are disclosed for receiving and transmitting accelerometer data and/or usage data, and analyzing the data to detect movement or usage of the device within a vehicle. A device, such as a mobile device, may detect a device movement event or a device usage event associated with the device. Based on the detection of the device movement event or the device usage event, a time associated with the event may be stored. The device may determine whether another event associated with the device occurs within a threshold amount of time from the time associated with the event. Based on a determination of whether the other event occurs within the threshold amount of time, the device may determine an event session associated with the device. The event session may comprise an instantaneous event or a continuous event. Data indicative of the event session may be transmitted to a server.

Abstract: An information processing system includes processing circuitry that is configured to receive input data from a shock sensor which outputs data based on a shock on the shock sensor, and identify a target segment of time-series data that is output from a motion sensor that senses a motion of an object. The target segment includes a pre-shock portion that occurs before the shock event and a post-shock portion that occurs after the shock event, the shock event is recognized based on the data from the shock sensor.

Abstract: A launch monitor for golf training includes both a continuous wave radar transmitter and a frequency modulated continuous wave radar transmitter. A first set of golf ball trajectory parameters are estimated with the continuous wave radar transmitter and a second, different set of golf ball trajectory parameters are estimated with the frequency modulated continuous wave radar transmitter. The array of transmitters and receivers may be non-uniform.

Abstract: This invention is smart clothing which enables human motion capture through combined analysis of data from dual inertial sensors and dual stretch (or bend) sensors. In a preferred embodiment, a first inertial motion sensor is located proximal to a body joint, a second inertial sensor is located distal to the body joint, and two stretch sensors span the body joint in different configurations.

Abstract: An apparatus and method determine movement information for a user that carries an accelerometer whilst moving. The apparatus receives acceleration data from the accelerometer defined relative to a frame of reference of the accelerometer. A transformation is determined and applied to the acceleration data or to data derived from the acceleration data to determine acceleration data is a user frame of reference that includes a user direction of travel and a side to side direction transverse to the user direction of travel. The acceleration data or data derived from the acceleration data is analyzed to determine a time period corresponding either to a user stride period or to a step period as the user is walking or running; and information about accelerations in the side to side direction are used to disambiguate whether the determined time period corresponds to the user stride period or to the user step period.

Abstract: The present disclosure pertains to detection of a broken conductor in an electric power system. In one embodiment, a broken conductor detector may be configured to be mounted to an electrical conductor and may comprise a communication subsystem configured to transmit a signal configured to indicate that the conductor is broken. A sensor may determine a plurality of vectors. A processing subsystem may be configured to receive the plurality of vectors from the sensor and to identify when the vector is outside of a range defined by a threshold value. The processing subsystem may determine that the conductor is falling based on the plurality of vectors remaining outside of the threshold for a period of time determined by the timer subsystem. A signal may be transmitted by the communication subsystem to indicate that the conductor is falling.

Abstract: A method for detecting a collision of a vehicle, using a measuring device rigidly connected to the vehicle, including the following features: —in each instance, an acceleration of the measuring device with regard to a plurality of device coordinate axes specific to the measuring device is measured; in each instance, an installation position angle of the measuring device with respect to a plurality of vehicle coordinate axes specific to the vehicle is calculated and/or measured and/or programmed from outside; with the aid of the installation position angles, a vehicle acceleration along the vehicle coordinate axes is ascertained, and an evaluation of the accelerations is undertaken; and the degree of determination of the installation position is ascertained by the device and taken into consideration for weighting the accelerations. the collision is detected in light of the evaluation of the vehicle acceleration.

Abstract: An equipment diagnosis system and method, which use abnormal data and normal data of equipment and accurately and effectively perform diagnosis on the equipment, are provided. The equipment diagnosis system includes a data acquisition unit to acquire time series data of equipment, a preprocessing unit convert the time series data into frequency data including a temporal component through a Fourier transform, a deep learning unit to perform deep learning through a convolution neural network (CNN) by using the frequency data, and a diagnosis unit to determine a state of the equipment to be a normal state or a breakdown state based on the deep learning.

Abstract: A method for ascertaining a transverse-velocity-component (TVC) of a radar-target (RT), including: periodically sending modulated, transmitted signals with a transmitting device (TD) having transmission-elements, into a sensing-region of the radar-device (RD), during a measuring-period; receiving a radar-signal (RS) reflected by the RT, using a receiving-device having receiving-elements; transmitting the received (RS) to an evaluation-device and converting it; performing a two-dimensional Fourier-transformation (FT) to generate a velocity-distance spectrum (VDS) of the digital-measured values for each transmission/receiving element; detecting a target reflection of the RT in light of, peak values in a magnitude-spectrum of the VDS; ascertaining a distance of the RT from the RD, and a radial-velocity-component relative to the RD, from the VDS; determining an angle of the RT relative to the antenna; selecting the RT; performing an inverse FT of the target reflection of the RT, and ascertaining the transverse-ve

Abstract: A holder for a sensor unit, has at least two bus bars, wherein an internal electrical interface to a measuring transducer is formed at first ends of the at least two bus bars, and an external electrical interface for a connector module is formed at second ends of the at least two bus bars. An alignment component surrounds the at least two bus bars and is arranged between the internal electrical interface and the external electrical interface, wherein an alignment of the alignment component defines an outgoing direction of the second ends of the at least two bus bars and of the external electrical interface.

Abstract: Embodiments of the present disclosure relate to a method and apparatus for controlling equipment. The method includes: acquiring an electrical signal collected by a displacement sensor; determining a displacement of a movable rod of a hydraulic cylinder relative to a cylinder tube of the hydraulic cylinder according to the electrical signal; determining, according to the displacement, a rotating angle of a mechanical arm connected to the movable rod relative to a mechanical arm connected to the cylinder tube; and controlling equipment according to the rotating angle.

Abstract: A system for pattern-based identification of a driver of a vehicle includes a mobile device; and a server configured to communicate with the mobile device. The mobile device collects movement information during a driving trip via one or more sensors in the mobile device, and communicates the collected movement information to a server. The server analyzes the movement information via a classifier, identifies driving features for the driver based at least in part on the analysis of the movement information, creates an identification model for the driver based on identified driving features, and stores the identification model.

Abstract: A method for reporting data and related products are provided. The method is applicable to an electronic device and includes the following. A timer of the electronic device records a continuous weightlessness duration of the electronic device when the electronic device is in a weightlessness state. A fall detection sensor of the electronic device collects falling data of the electronic device in real time when the electronic device is in the weightlessness state. A processor of the electronic device coupled with the timer and the fall detection sensor obtains falling data from the fall detection sensor when the continuous weightlessness duration is longer than a preset duration. A communication module of the electronic device coupled with the processor reports the falling data obtained by the processor to a preset device.

Abstract: Methods and machines involve detecting when a mobile device is in a first area and a second area at different times, collecting pressure data from the mobile device and reference sensor(s) to estimate altitudes of the mobile device within the first area and the second area, collecting terrain altitudes associated with the first area and the second area, and using a difference between the estimated altitudes and a difference between the terrain altitudes to determine a height of a floor. The estimated floor height may be used to calibrate a pressure sensor of a mobile device.

Abstract: A system for monitoring injuries comprising a plurality of wearable user input devices and a wireless transceiver. Each of the plurality of wearable user input devices may be configured to detect motion patterns of a user. Each of the plurality of wearable user input devices may be configured as performance equipment. The wireless transceiver may be configured to communicate the motion patterns to a user device. The user device may be configured to (i) develop and store reference patterns related to impacts, (ii) compare the detected motion patterns with the reference patterns, (iii) estimate a location and direction of an impact based on the comparison, (iv) accumulate data from the estimated impact with previously suffered impact data, (v) aggregate results based on the accumulated impact data and context information and (vi) generate feedback for the user based on the aggregated results.

Abstract: A system to provide direct communication between a computing device and an external movement sensor is herein provided, the system including an external movement sensor having a sensor communication unit; and a computing device with a *Nix OS configured to selectively utilize data/information received from the movement sensor via the movement sensor's communication unit.

Abstract: A travelling direction calculation apparatus includes an acceleration sensor, a period identification unit, an action determination unit, a vector calculator, and a travelling direction decision unit. The period identification unit identifies a stable measurement period and an idling leg period based on change in a vertical component of acceleration detected by the acceleration sensor. The action determination unit discriminates between walking and running by using the minimum value of the vertical component of the acceleration in the idling leg period. The vector calculator calculates a velocity vector from a horizontal component of the acceleration in the stable measurement period. The travelling direction decision unit decides a direction of traveling of a user based on a result of determination performed by the action determination unit and the velocity vector calculated by the vector calculator.

Abstract: A method and apparatus for detecting a wearing state of a smart wearable device, which utilizes the characteristic that there is a difference in the reflection of infrared rays having different light intensities by different objects, acquires a first effective mean value of light intensities of reflection signals of a first infrared ray and a second effective mean value of light intensities of reflection signals of a second infrared ray, and judge the wearing state of the smart wearable device by the difference between the first and second effective mean values, thereby avoiding misjudgment caused by judging the wearing state by distance and misjudgment caused by judgment conditions such as temperature difference and capacitance difference which are greatly affected by the surrounding environment. The reflection signals of two infrared rays having different light intensities are used in comparing, which improves the accuracy of judgment.

Abstract: A method for estimating the external radius Re of a tire fitted to a wheel of a motor vehicle, the wheel including a radial acceleration sensor. The method includes: acquiring, by the sensor, a signal S when the vehicle is in motion under non-steady-state conditions, detecting local extrema of the signal S which are respectively associated with phase values and with detection instants, determining a variation in frequency F? of rotation of the wheel as a function of said phase values and of said detection instants, determining, for at least one detection instant, a discrepancy between the local extremum associated with said detection instant and a reference signal obtained by eliminating the fluctuations in the signal S, determining a value for the longitudinal acceleration Val of the vehicle as a function of the at least one discrepancy, estimating the external radius Re as a function of Val and F?.

Abstract: A method for imbalance warning to be implemented by a wearable electronic device positioned on a body part of a user includes steps of: obtaining acceleration data during a calibration period; obtaining an angle threshold based on the acceleration data thus obtained; obtaining angular velocity data during a unit of time; calculating a sway angle based on the angular velocity data; determining whether the sway angle thus calculated exceeds the angle threshold; and when it is determined that the sway angle exceeds the angle threshold, outputting a signal that indicates imbalance of the user.

Abstract: Techniques are provided for unification of classifier models across device platforms of varying form factors and/or sensor calibrations. A methodology implementing the techniques according to an embodiment includes extracting classification features from data provided by sensors associated with a first device platform. The method also includes applying a feature mapping function to the extracted features. The feature mapping function is configured to transform the features such that the are suitable for use by a classifier model that is trained on data provided by sensors associated with a second device platform. The method further includes executing the classifier model on the transformed features to generate classifications, for example recognized activities associated with use of the first device. The feature mapping function is based on application of a statistical distribution distance minimization between a sampling of data provided by sensors of the first device and sensors of the second device.

Abstract: An emergency management method comprising a device (1) for emergency calls and a central management information centre (30); said method comprises the steps of: recognizing a danger situation on the basis of processing of the signals provided by at least one movement sensor (13) and by a GPS module (11), positioned in said device (1); said step of recognizing a state of danger comprises the steps of: verifying a variation of the position obtained by said GPS module (11), verifying that the value of said at least one movement sensor (13) has exceeded a predefined limit; entering a state of attention if said checks are positive; said method, having recognized said state of attention, comprises the steps of: activating a timer for a first time; and if the position obtained by said GPS module (11) has not varied within said first time, and the value of said at least one movement sensor (13) is below a given predefined sensitivity threshold, within said first time, said method enters a state of alarm; said method

Abstract: A system and method wherein ball spin rate and axis orientation are determined according to an electronic circuit that includes a magnetometer spin sensor module and, in the alternative, an electronic circuit that includes a spin sensor module with a plurality of accelerometers.

Abstract: The systems and methods provided herein are directed to a device for tracking a jumper's elevation during a parachute jump. The device includes an active sensor for monitoring a distance to the ground, which is disposed at an angle and transmitted from the jumper's calf to reduce the chance of self-obstruction. The device notifies the jumper in one of several ways when a threshold elevation is reached, and may take additional automated actions at particular elevation thresholds.

Abstract: An activity classification device is disclosed. The activity classification device comprises one or more motion sensors and a memory configured to receive signals from the one or more motion sensors. The device further includes a processor in communication with the memory. Finally, the device includes a classification algorithm executed by the processor, the classification algorithm for identifying activities that a user is engaged in. The memory may also record a user's activity log, calorie count and an RF module, which transmits the recorded data to a host either upon request or continuously.

Abstract: Estimating fluid related quantities of a first fluid compartment and a second fluid compartment disposed in or connected to a moveable platform. Measurements from the first fluid level sensor, the second fluid level sensor, the third fluid level sensor, the fourth fluid level sensor are combined into a unified calculation. The fluid related quantities are calculated from the unified calculation, the fluid related quantities comprising all of: (1) a fluid orientation estimate which is common to both the first fluid compartment and the second fluid compartment, (2) a first fluid height estimate for the first fluid compartment, and (3) a second fluid height estimate for the second fluid compartment, whereby (1), (2), and (3) form a set of results.

Abstract: Facilitating dynamic adjustment of a click/unclick threshold corresponding to a force-based tactile sensor is presented herein. A system can comprise a tactile sensor comprising force-based sensor(s); and a motion detection component that can determine a rate of change of a movement that has been detected via a group of sensors comprising the force-based sensor(s), and based on the rate of change of the movement, modify a defined sensitivity of the force-based sensor(s) with respect to detection of a click and/or unclick event corresponding to the tactile sensor. Further, the motion detection component can decrease the defined sensitivity with respect to detection of the click and/or unclick event in response to the rate of change being determined to satisfy a defined condition representing an increase in the speed at which the stylus or the finger has moved across the tactile sensor.

Abstract: A system for automatically detecting an operational event for a bulk material hauler vehicle. The system includes a sensor mounted on the bulk material hauler vehicle, which is adapted for hauling a bulk material such as an aggregate. The system further includes a telematics system provided on the bulk material hauler vehicle. The telematics system includes a processor running software (or executing instructions or code) for detecting the operational event (e.g., providing functions of a load and unload detection module or discriminator as described herein). During vehicle operations, the sensor transmits sensor data to the telematics system, and the detecting of the operational event includes retrieving a signature definition for the operational event and then verifying the sensor data meets requirements of the signature definition. In some embodiments of the system, the operational event is loading the bulk material on or unloading the bulk material from the vehicle.

Abstract: A computing system includes a first hardware element having a first accelerometer and a first gyroscope, and a second hardware element having a second accelerometer and a second gyroscope. The first and second hardware elements are moveable with respect to each other. The computing system recursively generates a result signal indicative of a relative orientation of the first and second hardware elements with respect to each other. The result signal may be generated by generating a first intermediate signal indicative of a angle between the first and second hardware elements based on signals generated by the first and second accelerometers and generating a second intermediate signal indicative of the angle based on signals generated by the first and second gyroscopes. The result signal indicative of the angle may be generated as a weighted sum of the first intermediate signal and the second intermediate signal. At least one of the first and second hardware elements is controlled by on the result signal.

Abstract: Physiological signal processing systems include a photoplethysmograph (PPG) sensor that is configured to generate a physiological waveform, and an inertial sensor that is configured to generate a motion signal. A physiological metric extractor is configured to extract a physiological metric from the physiological waveform that is generated by the PPG sensor. The physiological metric extractor includes an averager that has an impulse response that is responsive to the strength of the motion signal. Related methods are also described.

Abstract: The present invention provides a system for monitoring a physiological parameter of players engaged in a sporting activity. The system includes a plurality of reporting units, a controller, and a signaling device. The reporting unit has an arrangement of sensing devices that measure the physiological parameter of an individual player and generate parameter data. The controller receives the parameter data transmitted from each reporting unit and then processes the parameter data to calculate a parameter result. When the parameter result exceeds a predetermined value, the controller communicates with a signaling device that provides an alert to sideline personnel to monitor the player(s) in question. The system also includes a remote storage device for holding historical data collected by the system which permits subsequent analysis.

Abstract: A swing analysis device includes: an acquisition unit (swing video acquisition unit) acquiring a swing video of a user; a processing unit deciding an impact timing and a tempo, based on the swing video; and a display unit displaying the swing video and the tempo. The display unit, while displaying the swing video, displays the tempo when the impact timing is reached in the swing video.

Abstract: This disclosure relates to systems and methods to analyze gait, balance or posture information extracted from data collected by one or more wearable and connected sensor devices with sensors embedded therewithin. The embedded sensors include a three-axis accelerometer, a three-axis gyroscope and an array of pressure sensors. Sensor data detected by the sensors can be received by a mobile computing device, which can analyze the sensor data to identify a pattern related to gait, balance or posture within the sensor data; and apply a statistical/machine learning-based classification to the pattern related to gait, balance or posture to assign a clinical parameter to the pattern characterizing a risk of a slip, trip and fall event.

Abstract: The present invention relates to an apparatus (100), system (200), method (300), and computer program for distinguishing between active and inactive time periods of a subject. An input unit (110) receives time-dependent activity data (120) (e.g., corresponding to a level of activity). An activity threshold providing unit (130) provides an activity threshold (140) for the subject. An activity assessment unit (150) classifies the time-dependent activity data (120) based on the activity threshold (140). The activity threshold providing unit (130) provides the activity threshold (140) individually for said subject. The present invention provides an approach to patient-tailor the activity threshold (140) for periods of activity and inactivity.