KEYWORDS: Information security, Network security, Reliability, Systems modeling, Mobile communications, Information technology, Mathematical modeling, Lithium, Intelligence systems
The PUF-based VANET protocol has been widely studied for its ability to provide additional anti-counterfeiting features to devices. However, most PUF-based VANET protocols only protect the vehicle without considering the risk of copying secrets for the Roadside Unit (RSU), and do not consider the huge computational cost of error correction algorithms on embedded devices. Therefore, in this paper, we design a lightweight multi-PUF-based VANET protocol. In the proposed protocol, PUF is designed to be placed on both the vehicle and RSU to avoid the security threat posed by fake nodes, providing higher security of the system. Combined with the algorithms of reverse fuzzy extractor and fuzzy extractor, the computing resources can be reasonably allocated, and the delay can be reduced to the maximum extent. Experiments show that the proposed protocol has lower computational cost and higher security than the traditional PUF protocol.
KEYWORDS: Signal detection, Sensors, Scintillators, Lithium, Glasses, Amplifiers, Particles, Luminescence, Interference (communication), Signal to noise ratio
As a traditional neutron detector, 3He proportional counter tube has the advantages of high thermal neutron detection sensitivity and good energy resolution. However, due to its high cost, difficult fabrication, and poor anti-interference ability, it is necessary to find better alternative products. In this paper, based on the principle of nuclear reaction neutron detection, a small thermal neutron detector is fabricated by coupling a silicon photomultiplier (SiPM) and a 6Li glass scintillator. The characteristics of its output signal are verified by experiments, and the influence of bias voltage and temperature on the output signal is studied. The experimental results show that the detection unit has a reasonable design and can effectively realize the detection of neutrons. The output signal pulse amplitude is -2.80V and the pulse width is 325ns, which meets the requirements of back-end acquisition. With the change of temperature and bias voltage, the noise amplitude of the output signal of the detection unit shows an opposite trend, which provides a solution for the problem of stable operation of the detection unit in different temperature environments.
Silicon waveguide grating coupler is one of the most important optoelectronic devices in optical communication system. We study on the angle detection capability of silicon waveguide grating coupler. The silicon on insulator (SOI) waveguide grating coupler is designed based on slab waveguide theory firstly. The parameters of the grating structure, which cannot be determined by slab waveguide theory, are optimized by finite difference time-domain (FDTD) solution, such as the grating length, the etch depth and the duty cycle. Simulations are carried out to test the angle detection capability of the silicon waveguide grating coupler. It is demonstrated that the silicon waveguide grating coupler can be used as an angular sensor, with a detection range of 25°.
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