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Previous research experience shows that the PZT piezoelectric ceramics have good sensing effect, and it can be used for structural health monitoring of civil structures. Most of the studies focus on the change of signal results in the process of monitoring, but less on the selection of PZT materials. Based on the discussion of the relationship between material properties and structural vibration frequency,...
Bioelectrical impedance is a body's important parameter, which, to a certain degree, reflects the physiological state of the human body. According to the shortage that traditional five-segments model of human body impedance can't satisfy the needs of figuring out human trunk subdivision impedance, the exiting solution of eight-segments bioelectrical impedance module is premised on the basis of symmetrical...
The prediction model of existing human body composition based on measured bioelectricity has problems that include redundant influence factors and low prediction accuracy. To address these problems, this paper put forward a human body composition prediction model based on Akaike Information Criterion (AIC) and improved entropy method. First, combining with the AIC information principle, we selected...
Body composition analysis can not only reflect the state of health, but also can play a role in disease prevention. Aiming at many influencing factors, complex modeling issues of the existing bioelectrical impedance analysis algorithms, this paper draws information entropy theory into modeling the human body composition for the first time, establishes entropy evaluation criteria of physiological characteristic...
A novel, compact bandpass filter is proposed using stepped-impedance resonators (SIRs). The basic filter structure is composed of two parts, the central SIR sections and the input/output (I/O) SIR sections. The two central SIRs are folded to achieve a compact size and coupled to the I/O SIRs. This new structure has an inherent transmission zero on the upper stopband edge. The skew-symmetric feeding...
A compact microstrip-line-fed double T-shaped slots antenna with a rectangular patch for bandwidth enhancement is proposed and experimentally studied. By attaching a rectangular patch to the end of the microstrip feed line, a feature of bandwidth enhancement for the antenna is achieved well. From the experimental results, the measured impedance bandwidth of the fabricated prototype can cover a wide...
Traditional human impedance measuring instruments adopt excitation signal with single frequency, which makes the measurement result cannot reflect the true character of human impedance. Meanwhile, they measure the whole body impedance, which makes the measurement result cannot reflect the body segments' impedance character that is very significant on many conditions, such as the measure of the body...
A novel electro-magnetic transient analysis technique based on approximation and z-transform theorems is proposed in this paper. The differential function relates to time is firstly approximated to convolution of the projection of differential operator and the function itself, subsequently the digital equation of transmission line is established. The z-transform is employed to obtain the solution...
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