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• 2003.12a
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• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.10a
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• 2009

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• Proceedings of the Korean Society of Precision Engineering Conference
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• 한국문화재보존과학회:학술대회논문집
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• pp.36-36
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• 2004

• Proceedings of the Optical Society of Korea Conference
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• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2001

We survey recent results on the inverse kinematic problem arising in geophysics. The question is whether one can determine the sound speed (index of refraction) of a medium by measuring the travel times of the corresponding ray paths. We emphasize the anisotrpic case.