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17. Optimized linear precoder in MIMO interference channel using D.C. programming.

Author

Tam, H. H. M., Enlong Che, and Tuan, H. D.

Abstract

In this paper, we are concerned with optimized linear precoding strategies for multiple-input multiple-output interference channels (MIMO-IFC). Under practical transmission power constraints, we aim at maximizing the sum-information-rate. To date, most developments could not directly address this problem. Instead, intermediate problems of simplification have been considered by means of alternating optimization, which fails to jointly optimize all the concerned variables. In this paper, we directly solve this problem by exploring its hidden d.c. (difference of convex functions) structure. The recast problem can be iteratively solved by d.c. iterations (DCIs), which guarantees the convergence to at least a local optimum. Numerical simulation results show that the proposed solutions offer improved performance. [ABSTRACT FROM PUBLISHER]

Published
2013
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20. SPECT-CT in total hip arthroplasty.

Author

Tam HH, Bhaludin B, Rahman F, Weller A, Ejindu V, and Parthipun A

Subjects
Humans, Arthroplasty, Replacement, Hip, Hip Joint diagnostic imaging, Multimodal Imaging, Postoperative Complications diagnostic imaging, Tomography, Emission-Computed, Single-Photon, Tomography, X-Ray Computed
Abstract

Single photon emission computed tomography combined with computed tomography (SPECT-CT), which combines functional and anatomical imaging, provides superior spatial localization to plain radiography and is more tolerant to metallic artefacts than conventional imaging such as magnetic resonance imaging (MRI). It is increasingly used in musculoskeletal imaging to enable accurate anatomical localization of increased tracer uptake, and is particularly useful in assessing metal prosthesis and the surrounding bone following total hip arthroplasty (THA). In addition to detecting complications of THA, SPECT-CT enables multiplanar reconstruction and manipulation of imaging data, which may aid surgical planning. SPECT-CT is an important adjunct to conventional imaging in the management of post-THA complications. It is vital that radiologists are able to identify the specific features of different complications and use this novel imaging technique to guide management. In this article, the use of SPECT-CT to follow post-THA complications, including aseptic loosening, periprosthetic infection, histiocytic reactions, periprosthetic fractures, polyethylene wear, and pseudotumour formation, will be reviewed., (Copyright © 2013 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.)

Published
2014
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