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With the prevalence of smartphones, people have left abundant behavior records in cyberspace. Discovering and understanding individuals’ cyber activities can provide useful implications for policymakers, service providers, and app developers. In this paper, we propose a framework to discover daily cyber activity patterns across people's mobile app usage. The framework first segments app usage traces into short time windows and then applies a probabilistic topic model to infer users’ cyber activities in each window. By constructing and exploring the coherence of users’ activity sequences, the framework can identify individuals’ daily patterns. Next, the framework uses a hierarchical clustering algorithm to recognize the common patterns across diverse groups of individuals. We apply the framework on a large-scale and real-world dataset, consisting of 653,092 users with 971,818,946 usage records of 2,000 popular mobile apps. Our analysis shows that people usually follow yesterday's activity patterns, but the patterns tend to deviate as the time-lapse increases. We also discover five common daily cyber activity patterns, including afternoon reading, nightly entertainment, pervasive socializing, commuting, and nightly socializing. Our findings have profound implications on identifying the demographics of users and their lifestyles, habits, service requirements, and further detecting other disrupting trends such as working overtime and addiction to the game and social media.
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Stored only when both papers are in the corpus — 97 citations exist upstream.
Papers that cite the same references — the relational fallback while embeddings are still backfilling.
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