【正文】 monitoring and control David D. Harris,Feng Zhang,Peter H. SydenhamAbstract when any measurement tasks close to the required academic point of view, we find that, the subject usually contains a series of data, and this subject is interpreted as a set of control language. The application is now in the measurement and control of water quality, is the basis for healthy breeding of fish. It is said before the base of control, to provide realtime measurement data, to ensure the health of the fish is very important in the.The application of simplified puter expert system as the basis of control, in order to carry out realtime monitoring and control. This article discusses the basis for the development of the puter, the distributed monitoring and the establishment of expert control system. This system integrates heuristic and realtime changing knowledge, enhance the foundation of automatic decision making.This system is an important characteristic of Zheng, using only simple puter skills, directly through the founder of visiting expert system, rules of application and the operating system can change. And allow the strange user, to simplify the design and operation of the sensor through the construction of sensor knowledge, or to specify the desired sensor, and the system provides a requirement to build them.The measurement instrument and system center (MISC) is a research center of the University of South Australia, its goal is to develop better measurement methods and equipment. The basic method is the use of all projects. Recently, the research center is conducting a project with the South Australian Department of fisheries, the project will take this expertise with specific application to monitoring and control in aquaculture.Keywords: expert system, monitoring and control, knowledge base, user interaction1 backgroundIn order to reflect the region a knowledgebased methodology, it is necessary to develop a basic application.2 current aquaculture practicesFrom the sea to the land in the pond, all over the world are mon in aquaculture. Either freshwater or marine fish farming are the objects, including fish, crustaceans and animal software etc.. However, some mon problems in this task:Usually, the high cost of aquaculture aquaculture depends on labor and operating costs. because of differences in typical industrial process and aquaculture, the traditional industrial process method and application of control engineering is not simple on fish physiology and behavior understanding, especially in intensive farming conditions, is usually limited, local Experiment and modeling process in the growth of fish, the fish cause slow growth monitoring and control has a certain degree of difficulty. can be obtained according to a large number of different data about raising the growth of fish, the fish is very sensitive, if we can not guarantee quality, can cause fish in a very short period of time of death or failure. The fishermen have strong dependence on the puter control equipment, because of their ability to handle large amounts of data related to the fish breeding.3 water qualityThe purpose is to develop healthy fish fish are kept. No doubt, one of the most important factors affecting the health of the fish is the water environment problems in their lives. Effect of water quality depends on the physical, chemical and biological factors. These factors affect the water use。 these factors affect the survival of the fish, reproduction, growth, production and management. Many parameters influence each other, than farmers know more plicated. Can play an important role in the measurement of physical parameters including: dissolved oxygen temperature dissolved ammonia (NH 3 and NH4) pH salinity TurbidityAccording to the breeding of fish species and different environment, water quality including different binations of these factors.4 expert system of monitoring and control system based onAn ideal breeding monitoring system should have the ability to monitor the activities of fish. An ideal puter assistant, should growth and market trends can be inferred from the fish. At present, a savvy puter users, can be bined with existing software to obtain such data, although such a friendly user assistant can not use, but we should not ignore the fact, that is, any monitoring technology and control system has its own can plete the task. For example, control water quality was not the goal. In view of the above problems, the monitoring and control system should provide the ideal: having a continuous measurement and recording function, all parameters can be measured on the health of the fish is very important. the user can easy to modify system settings, and make a decision according to the measurement data system. set the user control operating system alarm or report records of fish growth and health data. record and other relevant data, especially the feeding and weather.Water is the prevailing wind, layout, pond fish species and density, algae, effects of bottom soil and various other factors. The ideal system should take into account the differences between these factors, monitoring and control of humanity.5 current technologyAquaculture industry has many related equipment suppliers in water quality monitoring. Research shows that, in some highend mercial market will have the use of puter systems, aquaculture monitoring and control of the 5, Hansen is such a system. Instrument suppliers usually bined with the project can get the benefit of providing advice and consulting services, and plete the task of system full use of their equipment.Researchers have used a puter to collect 6 measurement data and analysis. MacKinlay 7 additional mercial software package (such as spreadsheets) is a powerful tool to finish the work. Technology media described the installation method of the puter monitoring and control, but