Operation processing apparatus calculating numerical value representing skin barrier function, equipment, computer readable medium, and method for evaluating skin barrier function

A method of evaluating a skin barrier function by an electronic equipment, the method comprising the steps of:

• generating a first alternating-current (AC) signal in a first frequency by an alternating-current (AC) signal generation circuit;
• applying the first AC signal by an application electrode and making the first AC signal generated pass through skin;
• detecting the first AC signal passed through the skin by a detection electrode;
• converting the first AC signal to a first output signal and outputting the first output signal by a signal detection circuit;
• determining whether the first output signal falls within a detectable range, and when the first output signal is not within the detectable range, repeating the steps of generating, applying, and detecting the first AC signal and the steps of converting and outputting the first output signal until the first output signal falls within the detectable range;
• calculating a variable by a processor of an operation processing apparatus based on delay time measured using the first AC signal generated by the AC signal generation circuit and the first AC signal applied by the application electrode and the passed through the skin;
• storing a calculation result of the variable calculated by the processor;
• calculating a first skin impedance value, which is a susceptance value, based on the first AC signal generated by the AC signal generation circuit;
• storing a calculation result of the first skin impedance value calculated by the processor;
• generating a second alternating-current (AC) signal in a second frequency, which is different from the first frequency, by the alternating-current (AC) signal generation circuit;
• applying the second AC signal by an application electrode and making the second AC signal generated pass through skin;
• detecting the second AC signal passed through the skin by a detection electrode;
• converting the second AC signal to a second output signal and outputting the second output signal by the signal detection circuit;
• determining whether the second output signal falls within a detectable range, and when the second output signal is not within the detectable range, repeating the steps of generating, applying, and detecting the second AC signal and the steps of converting and outputting the second output signal until the second output signal falls within the detectable range;
• calculating a second skin impedance value, which is an admittance value, based on the second AC signal generated by the AC signal generation circuit;
• storing a calculation result of the second skin impedance value calculated by the processor;
• calculating a numerical value representing a skin barrier function by the processor based on the variable, the calculation result of the first skin impedance value, and the calculation result of the second skin impedance value;
• wherein the step of calculating the numerical value representing the skin barrier function includes using Equation 2,
• SCT=a1×Bo/Yp+a2×θ+a3×Yk/Bl+a4 [Equation 2]
• wherein SCT is the numerical value representing the skin barrier function,
• B is the susceptance value,
• Y is the admittance value,
• θ is the variable, and
• a1, a2, a3, a4, o, p, k, and 1 are constants;
• and
• wherein the constants of a1, a2, a3, a4, o, p, k, and 1 in Equation 2 are determined by performing, on the processor, a regression analysis of a plurality of sets of B, θ and Y and values representing a stratum corneum thickness.