Internet-of-Things (IoT) technology is increasingly prominent in the current stage of social development. All walks life have begun to implement IoT integration technology, so as strive promote industrial modernization, intelligence, and digitalization. In this case, how link high-risk network activities with entities has become primary issue for promoting However, at stage, security issues development contradictions that are difficult resolve. According situation, make system defense...

The complex interactions were performed among non-pharmaceutical interventions, vaccinations, and hosts for all epidemics in mainland China during the spread of COVID-19. Specially, small-scale epidemic city described by SVEIR model was less found current studies. with control established to analyze dynamical epidemiological features two Jinzhou City led Omicron variants before after Twenty Measures. In this study, total population (N) divided into five compartments: susceptible (S),...

Compared to copper wire-based network solutions, the passive optical (PON) system offers advantages such as large bandwidth, long transmission distance, low deployment cost, and fiber lifespan. However, inherent Time Division Multiple Access (TDMA) mechanism used in upstream direction makes latency of PON far from perfect. Novel techniques are introduced improve performance, among which, Frame-based Dense Burst Allocation method has been proven be effective. in-depth research on this is...

We report a high beam quality continuous-wave (CW) 320 nm ultra-violet (UV) laser. An end-pumped praseodymium-doped yttrium lithium fluoride (Pr:YLF) laser is constructed in typical V-shaped cavity structure, while the UV output obtained through intracavity frequency doubling using LiB 3 O 5 (LBO). investigate dependence of power, as well spot profile on LBO length, and find that “ walk-off ” within severely affects both frequency-doubling efficiency output. Rotated twin crystals are then...

Abstract At present, mobile devices generally use GPS, Beidou and other satellite time service methods to obtain time, but the clock synchronization based on IEEE 1588 protocol still has deviation. To solve this problem, a method is proposed improve protocol. Based analysis of protocol, deviation frequency which affect accuracy are modeled. The second-order Kalman filtering algorithm used recursively deduce deviation, Allan variance verify noise characteristics constantly correct Finally,...

As of May 2024, the main strains COVID-19 caused hundreds millions infection cases and deaths worldwide. In this study, we consider epidemics with in Chinese mainland. We study complex interactions among hosts, non-pharmaceutical interventions, vaccinations for by a differential equation model called SVEIR. The disease transmission incorporates two protection awareness susceptible population. Results show that plays crucial role against population, vaccines are effective circulation earlier...

The oscillation phenomenon of power system has always been one the main factors threatening stable and safe operation grid. If is not spontaneously subsided cannot be suppressed in time, a series safety accidents will caused. In this paper, dominant mode identification method based on multivariate empirical decomposition adopted. By introducing decomposition, synchronous multi-channel measurement signals realized, multiple intrinsic functions corresponding to different modes are obtained....

The PON (Passive Optical Network) system has merits of large bandwidth, low deploying cost, smart operating and maintenance, high network robustness etc. It is been extending its deployments towards industrial networking scenarios, from traditional public access networking. While for the users industry, they pose higher requirements on performance, especially transmission latency jitter. Conventional may not fully satisfied latency/jitter criterion in upstream direction certain applications....

At present, my country's power companies are facing a fierce market competition environment and complex social environment. In order to achieve corporate benefits in competition, should pay attention supply line loss, establish complete set of management manage adopt new technologies methods reduce loss consumption improve efficiency. Significantly increase, this can business operating costs economic benefits. This article will discuss analyze the reduction measures distribution network.

The line loss of the distribution network has a very important impact on economic benefits power company. But construction new system makes operation more and complex, which brings great challenges to analysis in low-voltage stations. This paper proposes hierarchical method for station area based cloud edge collaboration, full use existing intelligent fusion terminals, circuit breakers other equipment achieve multi-level accounting analysis, been verified practical engineering applications.

To address the issues associated with power drop between segmented transmitter of electric vehicle dynamic wireless transfer (EV-DWPT) systems, this paper proposes a new double solenoid magnetic coupling structure based on transmitters. The proposed adopts spiral winding coil, which can effectively improve performance in both horizontal and vertical pad misalignment. optimized design was conducted through finite element simulation measurement structure. 600mm*250mm at transmitting side 300mm...

In the field of passive time difference localization technology (TDOA), due to highly complex and nonlinear set equations, it is not easy solve. A kind LPNN network optimization algorithm based on maximum likelihood function proposed. The cost organized by combining TDOA constraints, a solving method for general constrained problem established. simulation results show that this has better performance than existing algorithms in various noise environments.

Abstract As the penetration rate of power electronic devices in system is getting higher and higher, broadband characteristics electrical quantities are becoming more significant, it has caused new network-related stability problems. The monitoring frequency band range response speed signals proposed New requirements. This paper uses super-resolution spatial spectrum estimation to propose a short-time window wide measurement method, estimates number signal components through kurtosis...