Question answer communities such as Stack Overflow and Yahoo! Answers are becoming more and more popular knowledge sharing communities, which have attracted great interest from both industry and academia. On such communities, people can ask questions of any kind and then wait for someone else to answer the questions. Nevertheless, in many cases, the questioners cannot get satisfactory answers from the answerers. In order to make the questioners obtain satisfactory answers, it is very necessary for question answer communities to know how to find the authoritative users and recommend some authoritative answerers to the questioners. We consider the problem of identifying authoritative users in Stack Overflow. So far, many methods have been proposed to automatically discover authoritative users in question answer communities. A common method is to use link analysis technique such as PageRank and HITS. The main problem with this method is that it does not consider an important factor, the time factor. In this paper, we investigate the time aspect of ranking with application in the Stack Overflow. The result shows that the proposed method is highly effective.

The development path of socialist education with Chinese characteristics in the new era requires the foundation of labor education. "It is an important feature of socialist labor education with Chinese characteristics to use Lao Shude, to increase labor with labor, to work hard, to improve beauty and to innovate with labor". The diversity of labor determines the diversity of labor education, and labor education is the starting point and condensation point of the integration of five cultures. The significance of this paper is to explore the theoretical system and practice mode of middle school students' labor education under the background of contemporary education and context, and provide theoretical support and practical guidance for comprehensively implementing the "five-education" education policy and cultivating high-quality talents in the new era.

Platforms are gradually becoming important business organization models, and platforms with bilateral market characteristics such as payment platforms and online shopping platforms are gradually penetrating people’s lives. Freemium content mostly exists in particular platforms such as online video platforms, etc. Platforms need to balance upstream and downstream markets when formulating strategies. This paper is the first to explore the time-to-market and pricing strategies of products in bilateral markets. By connecting upstream and downstream markets through cross-network externalities, we construct a system dynamics model of the problem, simulate the diffusion process of new product launches, and solve the problem of the optimal time to market and optimal pricing of the product. The simulation analyzes the effects of different parameters on the optimal time-to-market and pricing strategies, and comparing the diffusion in a unilateral market, we find that in a competitive market environment, the time-to-market and pricing of products are influenced by exogenous variables such as network externalities, and firms can promote their products more efficiently by changing the marketing mix strategy of platform product benefits and quality reputation. Meanwhile, the results obtained by considering bilateral markets when developing strategies for platform-based companies can lead to higher returns.

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The Editor-in-Chief and the publisher have retracted this article. The article was submitted to be part of a guest-edited issue. An investigation by the publisher found a number of articles, including this one, with a number of concerns, including but not limited to compromised editorial handling and peer review process, inappropriate or irrelevant references or not being in scope of the journal or guest-edited issue. Based on the investigation's findings the Editor-in-Chief therefore no longer has confidence in the results and conclusions of this article.Author Xing Hua has stated on behalf of all authors that they disagree with this retraction.Publisher's note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.