A control method of a sensor disposed in an exhaust system may include starting an engine; performing a first logic of checking whether moisture formed on a first sensor detecting one of the characteristics of exhaust gases emitted from the engine; when it is determined by the first logic that the moisture formed on the first sensor has evaporated, heating the first sensor; and performing a second logic of checking whether moisture formed on a second sensor disposed at the rear of the first sensor and detecting one of the characteristics of the exhaust gases.

A portable telephone includes at least one processor and the at least one processor detects a barometric pressure value (a water pressure value) based on an output from a pressure sensor. In an underwater mode, a touch panel is turned off and a function for an underwater operation is allocated to a hardware key. A guide image for notification of a function different from a function for use in atmosphere is shown in correspondence with a hardware key to which the function is allocated, on a screen shown during execution of the function.

A portable telephone includes at least one processor and the at least one processor detects a barometric pressure value (a water pressure value) based on an output from a pressure sensor. In an underwater mode, a touch panel is turned off and a function for an underwater operation is allocated to a hardware key. A guide image for notification of a function different from a function for use in atmosphere is shown in correspondence with a hardware key to which the function is allocated, on a screen shown during execution of the function.

This disclose relates to a robust method for automatic real-time monitoring or post-job evaluation of hydraulic fracturing operations based on predictive deconvolution of the wellhead pressure oscillations. Described are a method and system for determining depth of wellbore reflectors, implemented by performing a wellbore operation producing a pressure wave and its reflections from the wellbore reflectors; registering a pressure wave and its reflections; preprocessing the registered pressure wave and its reflections with a bandwidth filter; transforming the registered pressure wave and its reflections from the frequency domain into time-frequency representation with Short Time Fourier Transform (STFT); applying of a predictive deconvolution filter to STFT representation; identifying of a reflected signal on a plot in coordinates reflection timephysical time and determining the reflection time for the signal reflected from the wellbore reflector; determining the depth of wellbore reflector by multiplying the reflection time by pressure wave speed.

This disclose relates to a robust method for automatic real-time monitoring or post-job evaluation of hydraulic fracturing operations based on predictive deconvolution of the wellhead pressure oscillations. Described are a method and system for determining depth of wellbore reflectors, implemented by performing a wellbore operation producing a pressure wave and its reflections from the wellbore reflectors; registering a pressure wave and its reflections; preprocessing the registered pressure wave and its reflections with a bandwidth filter; transforming the registered pressure wave and its reflections from the frequency domain into time-frequency representation with Short Time Fourier Transform (STFT); applying of a predictive deconvolution filter to STFT representation; identifying of a reflected signal on a plot in coordinates reflection timephysical time and determining the reflection time for the signal reflected from the wellbore reflector; determining the depth of wellbore reflector by multiplying the reflection time by pressure wave speed.