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Data integration is an old problem that reemerged as an active research topic recently, due to the increased requirements for exchange of data in various formats in our increasingly interconnected but inevitably heterogeneous world. On the basis of existing technologies, metadata is proposed to realize heterogeneous data integration. Firstly, three-layered metadata model is introduced, including data source metadata, business metadata and topic metadata. Based on this, four-layered data integration service framework based on metadata has been put forward, and it respectively includes application layer, access layer, data integration layer and data source layer from top to down. The application layer supports C/S and B/S applications by the client SDK, the access layer provides uniform data access interfaces for different users by RESTful Web Services. The data integration layer shields the heterogeneity among all data sources, and provides the transparent access support for users. Finally, multiple sources and heterogeneous information resource access platform is implemented with c#. Metadata can provide a clear standard for scattered and heterogeneous data so as to achieve integration and sharing of data, which makes the users access all sources by uniform data access interface transparently. Meanwhile, metadata can not only keep the data consistency, but also provide better expansibility.

The large scale enterprise information systems are often consisted of many subsystems or components. Coordination among subsystems or components is an important problem in building and integrating complex enterprise information systems. In general, there is no single architecture of information system that is appropriate for any enterprise, and there is no single coordination mechanism that is appropriate for any enterprise information systems. In this paper, organization structures and coordination mechanisms are discussed. According to the similarities of certain coordination problems in different enterprise information systems, this paper gives some coordination patterns for coping with special cases, including centralized coordinator, shared data spaces, peer to peer, flow, and hierarchy.

The layout problem of business advertisements on newspapers belonging to orthogonal packing problem is nonlinear problem. The mathematics model of the problem is described. The encoding space and the decoding function of the genetic algorithm is designed basing on the problem characterizes. The simulation result shows that the genetic algorithm has better performance.

The complex software systems often involve many subsystems or components. Coordination among subsystems or components is a central issue in complex software development. The complexity of today software systems requires separation of coordinating entities from computational entities and runtime coordination. The paper presents a coordination framework that divides the system into coordinators and computational entities. The computational entities are represented as roles, processes and services so as to provide coordination with fine granularity. The coordinators are responsible for coordination among the roles. In our framework, coordinators are divided into three types: resource coordinator, communication coordinator and task coordinator. A set of general purposed data table I/O APIs are developed for relational databases, and some frequently used table I/O manipulations are provided as templates. In the paper, the strategies of coordination-oriented software development are discussed. A coordination framework based application development approach is proposed by a practical Commodity Trading System.