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In ZigBee networks, ZigBee Tree Routing (ZTR) is the simplest routing protocol with low overhead in which only parent-child links shall be used for packet transfer. However, there exist hop redundancy and traffic concentration in ZTR due to the limitation of tree topology. In this paper, we propose a novel tree-based routing algorithm, which is called Improved Shortcut Tree Routing (ISTR), to decrease...
As the defects in the LED chip is an important factor affecting the properties of high-power LEDs, a new measurement system is proposed which can get nonradiative recombination defect densities of a LED chip quantification ally, and a new method for evaluation of LED's performance is introduced which based on the relationship model between nonradiative recombination defect and LED's aging property...
For fabrication human-eye comfortable LED street lighting sources, specific optical beam shaping systems with rectangular illumination distribution were designed based on non-imaging optics. Furthermore, thermal dissipation and high efficiency and reliability driving solutions were presented.
Influence of temperature on color and luminance uniformity of LED-based direct backlight is investigated. A thermal management scheme is proposed. The color difference introduced by temperature is reduced by 50%.
The latest development of the key technologies including improvement of the internal quantum efficiency and external quantum efficiency of the high-power GaN-based LEDs, packaging and system application was reviewed and analyzed in detail.
This report review the packaging and application technology of high power white LEDs including the lower thermal resistance and high reliable packaging of a group of LEDs, unsymmetrical three-dimensional optical system research based on non-image optics and the actual optical system design (such as street lamp) with specific luminous intensity distribution
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