It is reported that Zhou Zhuohui, a professor of materials at the National Tsinghua University, has developed the world's first "artificial sunlight" OLED, which can perfectly simulate sunlight. Professor Zhou said that the current cost of solar color OLED is close to the practical stage, and now there are many manufacturers willing to develop into products, which can be mass-produced in the next 2 years.
The "artificial sunlight" technology developed by Professor Zhou Zhuohui is to adjust the band combination of the three primary colors of red, blue and green by changing the voltage, so that the original OLED light color can be emitted as the sun is dim and cloudy. The state of the natural light color and color temperature, this invention was also published in the international period. Professor Zhou said that in general, the light-saving bulb contains mercury, the fluorescent tube will blink, and the LED illumination has glare and high heat. The "artificial solar color" OLED developed now is a cold light source, which meets environmental protection requirements. Made in plastic sheets, free to post like wallpaper, and create a variety of time, different climates, different latitudes of the sun, especially for areas where there is no long-term sunshine in Northern Europe, this light source is very useful.
Zhou Zhuohui said that the current cost of OLED is also close to the level of practicality. It is estimated that the cost per lumen will be about NT$1.4 in 2012 and 0.4 yuan per lumen in 2015, which will be fully popularized. At present, many large manufacturers negotiate cooperation, and the products will be listed soon after 2 years.
The task of the managed switch is to keep all network resources in good condition. The network management switch product provides a variety of network management methods based on the terminal control port (Console), based on the Web page, and supports Telnet to remotely log in to the network. Therefore, network administrators can perform local or remote real-time monitoring of the switch's working status and network running status, and manage the working status and working mode of all switch ports in a global view.
The switch is the most important network connection device of the LAN, and the management of the LAN mostly involves the management of the switch.
The network management switch supports the SNMP protocol. The SNMP protocol consists of a set of simple network communication specifications, which can complete all basic network management tasks, has a small demand for network resources, and has some security mechanisms. The working mechanism of the SNMP protocol is very simple, mainly through various types of messages, namely PDU (protocol data unit) to achieve the exchange of network information.
There are also managed switches that provide policy-based QoS (Quality of service). Policy refers to the rules that control the behavior of the switch. The network administrator uses the policy to allocate bandwidth and priority for application flows and control network access. The focus is on the bandwidth management strategy required by the service level agreement and the way of publishing the policy to the switch. Multifunction light emitting diodes (LEDs) used to indicate port status, half duplex/full duplex and 10BaseT/100BaseT at each port of the switch, and switch status LEDs that indicate system, redundant power supply (RPS) and bandwidth utilization A comprehensive and convenient visual management system has been formed.
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