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Image reconstruction and motion model estimation in four dimensional cone-beam CT (4D-CBCT) are handled as two sequential steps conventionally. Due to the limited number of projections at each phase, the image quality of 4D-CBCT is degraded by the view-aliasing artifacts and the accuracy of subsequent motion modeling is decreased by inferior 4D-CBCT. The objective of this work is to enhance both the...
This research establishes an analytical model of the capacity allocation process, where the enterprise pursues maximum total customer value subject to the limited customization costs and adjustment costs. It is well-known that the less the discrepancy between customer requirements and enterprise offerings, the higher customer-perceived value is. Therefore, the optimization objective of the analytical...
This paper proposes a novel orthogonal algorithm and protocol of efficient group key management for secure multicast in distributed systems. In the proposed method, the sever only requires to multicast to update the group key after a subgroup or a user left and therefore bandwidth is reduced effectively. The nice features of the proposed scheme include few messages required in updating and almost...
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