Background Mastering a language involves not only learning new alphabets and expanding vocabulary, but also mastering sentence construction, pronunciation, and effectively engaging in listening, speaking, reading, and writing activities. Each aspect presents unique challenges for learners, especially non-native speakers. Traditional methods of language...

­Background Recent years have seen a growing interest in systems and technologies that rely on vision and wireless systems to provide certain capabilities. Examples include vision-aided wireless communications and wireless-vision activity recognition. However, these technologies have a common shortcoming; they do not directly address the association...