[gpgpu report] In memory grid files on GPUs database & GPGPU

attached is our work on database field using CUDA, containing a paper and its presentation on Sigmod07’s DaMoN workshop.
Sure that this work is only an initial try and might has mistakes, thanks for any suggestions!
(a known error: in .pdf, the “512 threads” in para.1 of Introduction should be “768 threads”)