PURPOSE This study sought to prospectively evaluate the feasibility and safety of a preoperative mathematic model for computed tomographic(CT) guided microwave(MW) ablation treatment of hepatic dome tumors. METHODS This mathematic model was a regular cylinder quantifying appropriate puncture routes from the bottom up. A total of 103 patients with hepatic dome tumors were enrolled and randomly...

In this paper, we do mathematic derivations for multiplecell system to estimate system performance with considerations of shadowing, multipath fading, antenna diversity, a voice active factor, and reverse-link power control. Complex statistic models for channels and systems are considered in the analysis. From our numerical results, the system performance is dependent on fading tr,vironment, su...

In clinical practice, the mechanical ventilation is a very important aided method to improve patients' breath, so parameter setting of ventilator directly affects pulmonary gas exchange. In this report, we try to build a decision support system based on the gas exchange model for mechanical ventilation using fuzzy logic. The gas exchange mathematic model can simulate individual patient's pulmon...

were fixed in formalin and immnersed in mineral oil. Area, length and diameter measurements were obtained from shortand long-axis cross-sectional images of the left ventricle and volume was calculated by seven mathematic models. Calculated volume was then compared, by linear regression and percent error analyses, with fluid volume of the left ventricle, obtained by filling the chamber with a kn...

A significant amount of research efforts has been given to explore the mathematical basis for 3D dimensional and geometric tolerance representation, analysis, and synthesis. However, engineering semantics is not maintained in these mathematic models. It is hard to interpret calculated numerical results in a meaningful way. In this paper, a new semantic tolerance modeling scheme based on modal i...

Resonant beam communications (RBCom) is capable of providing wide bandwidth when using light as the carrier. Besides, RBCom system possesses characteristics mobility, high signal-to-noise ratio (SNR), and multiplexing. Nevertheless, channel distinct from other communication technologies due to echo interference issue. In this article, we reveal mechanism propose method eliminate interference. M...

A coupled inductor can optimize the weight of a DC/DC converter while performance characteristics are complicated. To reduce influence system fault and keep stable operation converter, fault-tolerant strategy is proposed. Firstly, mathematic model obtained to compare difference between normal converter. Then, an open-circuit process analyzed for detection. design proper control system, transfer...