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이정모,Margarita N. Luneva 한국지질과학협의회 2012 Geosciences Journal Vol.16 No.1
Wave amplitudes and amplitude ratios between different wave types carry information about variations of medium properties with depth and time. The most information is contained in the reflection and transmission coefficients, which depend on the physical properties of contacting media and boundary conditions. In this paper, the range of variations in reflection and transmission coefficients of plane waves generated at boundaries with different properties is examined. Numerical simulations of coefficients were carried out for the models of rigid and non-rigid contact between isotropic and anisotropic media. At the rigid contact between isotropic media, amplitudes of generated waves and their ratios vary within relatively narrow limits while the physical parameters of the media may accept various reasonable values. In anisotropic media, coefficients depend not only on the slowness contrast, but also on the wave polarization directions, which may vary considerably in space. Amplitude ratios of generated waves may vary significantly with the incident angle, and the amplitudes of converted waves may dominate or be comparable with monotype waves. Introducing non-rigid contact between media considerably broadens the range of coefficient variations. In contrast to the rigid contact, the incident energy goes predominantly into reflected and converted waves. The amplitude of converted waves may be relatively large and exceed the amplitudes of monotype and incident waves. In general, reflection and transmission coefficients generated at non-rigid contact depend on the values of stiffness coefficients and their ratio.
이정모,이상훈,박영목,김치영,곽은경,이은혜,박지은,이창영,김세규 영남대학교 의과대학 2015 Yeungnam University Journal of Medicine Vol.32 No.2
Lymphangioma is a congenital abnormality of the lymphatic system detected primarily in early childhood. There are rare reports of mediastinal lymphangioma in older adults. We hereby report on a 66-year-old female patient who underwent kidney transplantation 20 years previously and who developed pathologically confirmed solitary mediastinal lymphangioma 1 year ago. Chest radiography showed a mediastinal nodule, which was not observed 2 year previously, therefore she was referred to the pulmonary division. She had no symptoms, and chest computed tomography demonstrated a 25-mm, well-defined, low-density nodule located at the anterior mediastinum. The size of the nodule had increased from 25 mm to 34 mm 1 year later, and it was completely resected via video-assisted thoracic surgery. The histological diagnosis was cystic lymphangioma. Therefore, we recommend that clinicians consider cystic lymphangioma as a possible diagnosis even in older patients with a mediastinal cystic mass that shows progressive enlargement.