Java Language for Numerical Control Simulation System Research

Java language is widely used in a variety of development platforms to develop all kinds of application software for its simple and efficient.The programming language owning platform independent is adopted to solve the image flicker,sound loading and other issues by the threading technology,multimedia technology,graphics and point by point comparison techniques.Dynamic real⁃time process simulation is implemented and a two⁃dimensional network of CNC machining simulation system is developed while Java applet application is as a carrier.The simulation results show that the system has a friendly interface and fast calculation speed,and platform portability has a certain practicality and application value.

Building an E-business System Using Enterprise JavaBeans Architecture

This paper provides an overview of using Enterprise JavaBeans to build an e-business system. First, the authors point out some difficulties during building an e-business sy stem. For example, how can we integrate all kinds of software and hardware i n company quickly and economically Then the authors introduce a representative EJB structure and currently EJB deve loping approaches. A representative EJB structure includes an EJB Server, EJB Co ntainers, EJB Clients and JNDI etc. An EJB Server is similar to CORBA ORB. It pr ovides system services such as original implementing environment, multiprocessin g, workload management, equipment accessing, JTS and JNDI service and making the EJB Container visible. The EJB Container plays the role of interface between th e EJB and others. An EJB Client never accesses Bean directly. There are two kind s of containers. One is session contain, it mainly includes brief, impermanent E JB(thus all statuses will not be saved). The other is entity container which inc luding permanent EJB. The EJB Client uses EJB Beans. First it finds EJB Containe r through JNDI interface. Then it transfers EJB methods using EJB Container. Current, EJB developing approaches include several major aspects such as develop ment, deployment, application programs assembling and management of Enterprise B ean etc. Above all, we should define three classes, Bean class, home interface c lass of Bean and remote interface class of Bean. Then we should create a deploym ent descriptor. This is an XML documentation, which declared the properties of E nterprise Bean and bound the class documentations of Bean(including stub documen tation and skeleton documentation). And then we put these deployments into a jar documentation and define environment properties in the deployer. Next, we shoul d assemble application programs including install Enterprise Beans to server and test the connecting of each ties. The program assembler integrates several Ente rprise Beans with other beans(like Servlet, Applet, Script etc) into an integrat ed application program. It also may integrate several Enterprise Beans into a co mplicated Enterprise Bean. Of cause we also need to manage the Enterprise Bean. In the end, the authors point out several major advantages of using EJB to build e-business system such as simplifying application development and deployment, supporting heterogeneous client and server platforms, leveraging existing skills and assets, delivering a secure, scalable, reliable and manageable environment and providing the freedom to implement using many vendors’ products.

RESEARCH AND IMPLEMENTATION OF A WEB-BASED CAD SYSTEM

Computer aided design on the Internet/Intranet explores new frontiers in design environment. A new Web based CAD system is introduced. The users can install the CAD system on the server to build three dimensional models of products through a Web browser in any operation systems. No system installation and system maintenance are required. A new architecture and the database of system are discussed. The UML models of the system are presented. The proposed organization is implemented on the World Wide Web using Java and CORBA.

Computer Vision Applied to Recognition Barcodes

The bar code is one of the identification technologies used more successfully in the world. This technology was first developed as the second half of the twentieth century and quickly achieved acceptance in both industry and commerce. In this paper studies are discussed on the design, development and printing of one-dimensional barcodes of the symbologies Code 39 and Interleaved 2 of 5. There are also discussed techniques for recovering the information encoded in the bar code, which can be extended to other symbologies. The purpose of the paper is the development of an open solution with the objective to make the decoding of barcodes using computer vision techniques possible, which will be divided into four basic stages： acquisition, pre-processing, processing and presentation of results. Practical tests conducted with samples show satisfactory results, validating the operating principles of the elements involved. The proposed objective was achieved and practical tests validated the operating principles of the elements addressed by providing contribution to that segment decoding barcodes.