This paper mainly analyzes the current state of dynamic spectrum allocation and spectrum sharing technologies, including contiguous and fragment DSA, underlay and overlay spectrum sharing, cognitive radio, and spectrum pooling, and with these technologies, the spectrum utilization rate can be improved efficiently.

Based on interference temperature model,the spectrum sharing problem is changed into a nonlinear power opti- mization problem.

This paper investigated the spectrum sharing based on price dynamics in cognitive radio networks in which one primary service provider sells idle spectrum at different price to secondary service providers,and secondary users dynamically adaped the requested spectrum size according to the received payoffs.

Cognitive radio technology as a smart spectrum-sharing technologies will be effective in alleviating these contradictions.

The signal processing methods of magnetic resonance spectroscopy in one dimension were initially investigated and discussed.

This paper describes the basic principles of magnetic resonance imaging and magnetic resonance spectroscopy related to the experiments’research , in particular to the relevant theory of the magnetic resonance imaging technology and the relaxation mechanism in detail.

Study in human viable myocardium by ~(31)P magnetic resonance spectroscopy;