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The determination of the cross correlation between an $m$ -sequence and its decimated sequence has been a long-standing research problem. Considering a ternary $m$ -sequence of period $3^{3r}-1$ , we determine the cross correlation distribution for decimations $d=3^{r}+2$ and $d=3^{2r}+2$ , where $\gcd (r,3)=1$ . Meanwhile, for a binary $m$ -sequence of period $2^{2lm}-1$ , we make an initial...
This paper presents the verification and implementation of non-inverting buck-boost converter in the application of energy-harvesting battery charger which is widely used in multiple power source embedded system. Simplified models for PV and rechargeable battery have been used for theoretical analyzing. Buck and boost topologies have been analyzed to obtain the MPP (Maximum Power Point) under different...
We have developed a new method to measure the water vapor transmission ratio (WVTR) for thin film encapsulation (TFE) of organic light emitting diodes (OLEDs). It is a nondestructive method to measure WVTR by investigating the change of photoluminescent spectra of organic material. This method can be realized easily by online test. By calibrating the evolution curve (the photoluminescent intensity...
Calculation formula of hydraulic impedance of surge tank is derived in this paper, which is suitable to both simple tank and throttled tank. And the effects of surge tank on the hydraulic vibration of pressurized conveyance system of hydropower are studied. The investigation shows that the attenuation factors of system decrease if the hydraulic resistance coefficient of surge tank increases. The hydraulic...
An experimental measurement method used to build the two-port model of the silencer based on the least square method (LSM) was developed here. The quantitative relationship between the parameters of the transfer matrix of the silencer and the sound pressure measured at the certain position in an experimental duct system was researched. A silencer and a measurement duct system are designed and established...
We consider the problem of group key agreement among n parties communicating over an insecure ad hoc network. Firstly, we analyze the state and the problem of existing group key management schemes, and then present a secure, efficient and contributory group key management scheme, which is based on elliptic curve cryptosystems (ECC). The security of our scheme relies on the hardness of elliptic curve...
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