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In order to utilize the spectrum resource more efficiently, with the development of cognitive radio technologies, dynamic spectrum allocation has been viewed as a promising approach to increasing spectrum usage and efficiency. With dynamic spectrum allocation, wireless service providers that operate in fixed spectrum bands allocated through static allocation can solve their short-term spectrum shortage...
Magnetic resonance spectroscopic imaging is an emerging non-invasive technique for both anatomic and metabolic evaluation in vivo, but a primary drawback of MRSI is its long acquisition time. We propose a post-processing method to calculate MR spectra by analyzing a statistical value of images scanned at two different acquisition bandwidths. Only normal MRI pulse sequence is needed in this method...
We present fabrication of 1.3-µm InAs QD-VCSELs and arrays. The output power of single VCSEL exceeds 1.2 mW. Modulation bandwidth of 2.65 GHz and 2.5 GHz are achieved for single-mode and multi-mode VCSELs. Maximum output power of 28 mW is demonstrated for VCSEL arrays with threshold current of 50 mA.
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