In order to resolve the problem brought by the heterogeneity, dynamics and distribution features of the Internet, we introduce agents and Broker into the Internet. A agent is an autonomic entity which represents a heterogeneityinterfaced object to provide a uniform interface; Broker provides the means by which agents can aware and cooperate with each other efficiently. After giving the agent-based resource heterogeneity model, Broker-based agent cooperation model and their mathematical description using Colored Petri Nets, we will discuss the Web cooperative retrieval system, whose kernel elements are Broker-centered cooperative agents. The system is featured by the Virtual Resource Base (VRB), and it supports the cooperative retrieval simultaneously on several distributive resource bases.The Internet provides a wide variety of information featured by heterogeneity, dynamics and distribution. Part of what makes information retrieval difficult is heterogeneity. Information resources, such as HTML documents and all kinds of databases, are created by different tools and in different store formats. The difficulties created by heterogeneity are exacerbated by dynamics in the Internet environment. Information is frequently updated, new information is added and old information is removed. What's more, the information is distributed around a wide range of areas, and it is often difficult for users to locate the information they need. Therefore, it is useful to establish a virtual resource base (VRE3) whose physical organization is transparent to users. Agent and Broker technology is the kernel technology of VRB. An agent must have "commonality" (all agents should interact with each other through a common Agent Communication Language or ACL which is independent on each agent), "veracity" , "autonomy" and "~ommitment"['~.The commonality makes agents capable to resolve the resource heterogeneity, and other features makes agents suitable to dynamical and scalability environment. In order to make agents work cooperatively and efficiently, a Broker is introduced. A Broker can provide the awareness among agents. By interacting with each other indirectly through a Broker , agents need not maintain all the other agents' service information, thus saving much overhead. In this paper, we will first discuss the fkction and working mechanism of agents and Broker. In order to give an exact description of agents and Broker, We use Petri nets to illustrate their function model and interaction model. Next, the design of Web cooperative retrieval system will be given, and its features will be discussed. Finally we introduce our fiture work and reach our conclusion. Agents Agent-based resource heterogeneity modelIn the Internet, there exist many kinds of heterogeneous information, and they provide different interfaces. In order to access them in a uniform form, it is necessary to screen the heterogeneity.Agent-based resource heterogeneity model is a possible solution, show as Figure 1.
The existing stand-alone multimedia machines and online multimedia machines in the market have certain deficiencies, so they cannot meet the actual needs. Based on this, this research combines the actual needs to design and implement a multi-media system based on the Internet of Things and cloud service platform. Moreover, through in-depth research on the MQTT protocol, this study proposes a message encryption verification scheme for the MQTT protocol, which can solve the problem of low message security in the Internet of Things communication to a certain extent. In addition, through research on the fusion technology of the Internet of Things and artificial intelligence, this research designs scheme to provide a LightGBM intelligent prediction module interface, MQTT message middleware, device management system, intelligent prediction and push interface for the cloud platform. Finally, this research completes the design and implementation of the cloud platform and tests the function and performance of the built multimedia system database. The research results show that the multimedia database constructed in this paper has good performance.
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