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Agent-based simulations of a simplified system model implemented on the swarm platform show that during the early stages of an agricultural society, wealth grows rapidly and migrates to a small percentage of landowners. Analysis of this simplified model indicate that the growth of wealth mainly results from the utilization of land and the rise of land prices, and that wealth aggregation occurs with...
To analyze the behavior of investors in Shanghai stock market, we mine frequent itemsets and association rules from a real securities clearing dataset. The mining results indicate that, most investors do not diversify their capital to avert risks according to expected risks of a stock. Further analysis reveals that most of the frequent stocks itemsets only cover a few state-owned big-cap (SB) stocks,...
In our study, we analyzed a securities clearing dataset from a Chinese brokerage firm, and classified investors based on their behavior. We calculate every account's market value, number of stocks and trading frequency, then reduce every account's stock portfolio to corresponding expected risk and rate of return. And we cluster these accounts using k-means algorithm, and obtain four distinct clusters,...
In the field of computer security, one of the most serious threats is masquerade attack, in which an attacker uses a legitimate user's account in system. In this paper, we propose a new method for masquerade detection based on string kernel. String kernel is an inner product in the feature space generated by all subsequences of length k. By using string kernel, OCSVM (one-class support vector machine)...
The establishment of the new academic discipline, services science, management and engineering (SSME), calls for a strong theoretical foundation. As a core element in the process of services, knowledge exchange and its measurement could be a focus of the new discipline. In this paper, we attempt to provide a roadmap toward achieving that goal. It is recognized that human beings as information systems...
In building up trust in online transactions, Taobao's trust mechanism fulfils a practical function at three levels. Firstly, at the level of technology, the immediate communication tool - Taobao Wangwang facilitates online communications remarkably; the third party payment instrument - Zhifubao ensures the Internet payment security to a great degree. Secondly, at the level of institution, besides...
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