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In the past two years, the short musical video platforms in China, represented by TikTok and Kuai Shou, have developed rapidly, and the number of users and social influence have risen sharply. As a result, many internet communities have formed within the platforms. These internet communities are generally characterized by youthfulness, large quantity, low thresholds, and discretely organized. Their formation and aggregation also lie in their satisfaction with the needs of users' cognition, emotion, personal integration, social integration and pressure relief. This paper will combine the theory of uses and gratifications, social identity and media law, and internet and offline research methods to analyze the characteristics and causes of the internet community of short video platforms.

The chiller system in a building accounts for the main part of the building's total energy consumption, so it is critical to optimize the operation of chiller system for the purpose of saving energy. A chiller system generally consists of evaporation side and condensing side. The condensing side includes chillers, cooling water pumps and cooling towers, which form a subsystem of cooling water. It is a typical optimization problem to minimize the total energy consumption of cooling water subsystem. This paper discusses how to solve the optimization problem of the cooling water subsystem and proposes a simple optimal control rule for field operation based on the optimization results.