Research on security risks and countermeasures of IPv6 network in the new era

In recent years, with the development of new infrastructure, especially the needs of 5G, Internet of Things, cloud services, data centers and other incremental large-scale construction, these “new increments” can be completely based on IPv6, or even pure IPv6 deployment to improve quality, reduce costs, and increase effi ciency. Therefore, in the process of constructing IPv6 network, how to ensure the overall security and stability of the network, and do a good job of network security protection and risk response to the maximum is very important. Based on this, this paper studies the security risk points of IPv6 network protocol and puts forward several security countermeasures for reference

Innovation in Content Design and Construction Path of University Physical Education Teaching Based on Mathematical Model Evaluation

Physical education is an indispensable educational content for cultivating qualified talents. Implementing the educational concept of "cultivating morality and cultivating talents" in college physical education classrooms, combining skill teaching with physical exercise, improving students' cognitive level of sports and health, integrating ideological and political teaching content into public physical education courses, emphasizing student process evaluation, using new technological means, and increasing the assessment of students' extracurricular physical exercise. Relying on student sports club activities, Sunshine Sports Alliance, sports team training and competition activities, strengthen the construction of the "second classroom", investigate students' learning attitude and moral quality, pay attention to path innovation, use research and mathematical evaluation analysis methods, calculate the elements and weights of the cultivation of teaching ability of college physical education, and try to establish the teaching content structure and evaluation system of public physical education. &nbsp

Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per cent

Metal halide perovskite materials are an emerging class of solution-processable semiconductors with considerable potential for use in optoelectronic devices1,2,3. For example, light-emitting diodes (LEDs) based on these materials could see application in flat-panel displays and solid-state lighting, owing to their potential to be made at low cost via facile solution processing, and could provide tunable colours and narrow emission line widths at high photoluminescence quantum yields4,5,6,7,8. However, the highest reported external quantum efficiencies of green- and red-light-emitting perovskite LEDs are around 14 per cent7,9 and 12 per cent8, respectively—still well behind the performance of organic LEDs10,11,12 and inorganic quantum dot LEDs13. Here we describe visible-light-emitting perovskite LEDs that surpass the quantum efficiency milestone of 20 per cent. This achievement stems from a new strategy for managing the compositional distribution in the device—an approach that simultaneously provides high luminescence and balanced charge injection. Specifically, we mixed a presynthesized CsPbBr3 perovskite with a MABr additive (where MA is CH3NH3), the differing solubilities of which yield sequential crystallization into a CsPbBr3/MABr quasi-core/shell structure. The MABr shell passivates the nonradiative defects that would otherwise be present in CsPbBr3 crystals, boosting the photoluminescence quantum efficiency, while the MABr capping layer enables balanced charge injection. The resulting 20.3 per cent external quantum efficiency represents a substantial step towards the practical application of perovskite LEDs in lighting and display.NRF (Natl Research Foundation, S’pore)MOE (Min. of Education, S’pore)Accepted versio