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Meningioma en plaque (MEP) is a rare tumor characterized more by its clinical and biological behavior than its histological appearance. Hyperostosis of the skull is one of the characteristic signs of MEP. This bony change can produce clinical symptoms and signs in MEP by pressing against adjacent structures. The authors report a rare case of an osteolytic MEP extending from the sphenoid wing into the orbital wall, middle fossa, and temporalis muscle.

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Objectives: This research was conducted to recognize dental health care employees' awareness of patient safety culture and to examine the association between awareness of patient safety culture and patient safety activities. Methods: The subject of this research includes the dental health care employees from 11 different dental hospitals in the nation, dental offices in the 6 different general hospitals in Seoul, and 4 different private dental offices in 2014. A self-reported questionnaire was completed by 485 dental health care employees from March 17 to April 3, 2014. Multiple regression models were used in the analysis. Results: First, the dental health employees' awareness of patient safety culture was 3.25 on average. The extent of patient safety activities was 2.75. The behavior of the supervisor/manager and the adequate explanation showed positive correlation with r=0.213 (p<0.001). The process of communication and the preventative inspection of the medical equipment showed negative correlation with r=-0.258 (p<0.001), and especially the awareness of patient safety culture and the infection control exercise showed the most significant correlation (r=0.293, p<0.001). Second, hospital environment factor of patient safety perceptions positively were related to most of patient safety management activities after controlling several covariates. Conclusions: The result of this research showed that most of the patient safety culture perceptions positively were correlated with patient safety activities. We also found that proper hospital environment, simple communication process, and positive perceptions for patient safety level were more likely to perform patient safety management activities after controlling several covariates. Improving the patient safety perceptions of dental hospital workers is an important consideration.

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In this work, the characteristics of AlGaAs film grown on transparent Al 2 O 3 substrate are investigated. AlGaAs films having various Al compositions were fabricated on the GaAs buffer layer of an Al 2 O 3 substrate using metal organic chemical vapor deposition. It was found that the crystal quality and surface roughness of the AlGaAs film was gradually improved by increasing the Al composition. The relatively improved surface and crystallizations were observed at AlGaAs film having an Al composition of 80%. A marked decrease in the d-spacing between the AlGaAs plane and Al 2 O 3 substrate was clearly observed under the same condition. From these results, the high-quality AlGaAs film on the Al 2 O 3 substrate was attributed to an increase in the substitutional effect of Al for Ga caused by increasing the Al composition.