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In this paper, we use a Spectrum Sharing/allocation algorithm to implement a Cognitive Radio network without spectral awareness. This allows radio resources to be allocated to primary users and to secondary users in such a way that primary system and secondary system are aware of each other. By doing this, sensing of spectrum holes is avoided but the primary users will be protected and will always...
This paper demonstrates a hybrid converter, which, for the first time, combines both the piezoelectric and the electromagnetic mechanisms in a ball-impact structure. The converter can harvest low-frequency vibration energy with an external power and has been proven to work in an environment with the ambient vibration frequency under 10Hz.
In this paper we describe an environmental system that has been developed to provide monitoring of pollutants. Unlike other work in the literature this system allows the collection and location-pinning of data to be carried out indoors as well as outdoors. The mixed indoor and outdoor data collected from different users can be classified into individual category using K-Means algorithm for further...
Primary-side regulation (PSR) scheme is widely used in low-cost and low power applications such as cell phone charger and LED lighting. Generally, an auxiliary winding in the conventional flyback converter is used for both power supplier and feedback sensing. With the increase of labor cost, the transformer needs to be produced automatically. So the transformer architecture should be designed as simple...
A bending type MEMS DC current sensor to satisfy the increasing needs of DC power supply for monitoring the electricity consumption by either one-wire or two-wire appliance cord was proposed in DTIP 2011. A linear relationship between the peak value of the impulsive output voltage and the DC current was obtained based on a macro-scale prototype device. In DTIP 2013, an oscillating type MEMS DC current...
Small businesses have played a major role in China's remarkable economic growth in the past decades. With their expanding business territories, many small businesses need employ a small fleet of vehicles to transport goods that are sometime environment sensitive or even hazardous. With limited and often zero in-house IT (information technology) capability, they have dire needs for the state of the...
This paper presents an attitude estimation algorithm for the satellite with three star trackers. The attitude estimation accuracy can be improved by modifying attitude matrix with measurement data from other star trackers. The attitude determination algorithm with two star trackers was reviewed firstly, then a modified attitude estimation algorithm using three star trackers is proposed to enhance...
LLC resonant converter has become an excellent candidate for front-end dc-dc converter because of its high efficiency and capability of optimizing the converter for normal operation condition over a wide input voltage and load range. However, lack of suitable driving scheme for the synchronous rectifier (SR) limits the efficiency improvement of LLC in the wide input voltage condition. Although corporations...
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