717 publications from this institution
Objective Adenocarcinoma ex pleomorphic adenoma is a rare tumor, and thus the management of the tumor has not been established. Methods The retrospective review of the clinical records at Okayama University was performed. Results We present five cases of adenocarcinoma ex pleomorphic adenoma of the head and neck, including a rare case with nasopharyngeal adenocarcinoma ex pleomorphic adenoma. There was no response to chemotherapy with nedaplatin and 5-FU, but the nasopharyngeal adenocarcinoma ex pleomorphic adenoma showed a remarkable regression after the administration of docetaxel. Conclusion The combination therapy that includes docetaxel may be a promising treatment for adenocarcinoma ex pleomorphic adenoma of the head and neck.
This paper presents a theoretical analysis and control of a three-phase modular multilevel cascade converter based on double-star chopper-cells (MMCC-DSCC). The analysis and control are characterized by applying the so-called “αβ0” and “dq0” coordinate transformations to the converter. Existing analysis and control methods were unable to use any coordinate transformation because the three-phase converter was considered as three sets of single-phase converters that were analyzed and controlled independently. As a result, it was difficult to avoid mutual interferences among the three-phase ac currents, circulating currents inside the converter, and dc current. Power-flow analysis using the two coordinate transformations succeeds in decoupling these currents, as well as in deriving lucid relationships between the power flow and the circulating currents. Moreover, the power-flow analysis makes it possible to design a decoupled digital controller for balancing and regulating the dc mean voltages of all the floating dc capacitors. The validity of the design is confirmed by computer simulation using a software package of PSCAD/EMTDC.
