A New Design Of The DIS Scientific Inquiry

DIS (Digital Information System), a combination of advanced electronic technology, innovative concept and actual demand of scientific research, is a teaching experimental system of new generation. For its wide application prospects in expanding cognition in different stages of education and scientific researches, more accurately, it is defined as a system for scientific inquiry.Taking the development of new edition DIS as its project background, this thesis firstly gives an overview of the current situation of DIS and its system composition, which contributes to our grasp of trends, and further show direction to this new design.Then this thesis analyses the realizing mechanism of old edition DIS and proposes upgrades and optimization on the basis of actual need and developing experience. Then charts of hardware architecture and software flow are put forward, which demonstrates the rudiment of the system.Specific implementation schemes of each system parts are put forward in this thesis, mainly for lower and upper platforms. To be noticed, USB and Ethernet communication between upper and lower platforms are not involved in this thesis.The optimization of lower platform in new edition DIS mainly includes hardware and software. This thesis focuses on hardware optimization, mostly about:1、CPU upgrade, from chips on ARM7platform to AT91SAM9261chips on ARM9platform;2、alternation of the screen’s drive mode that is controlled and drove directly by advanced LCD-Control through AT91SAM9261;3、supporting portable USB flash disk considering to the data storage of lower platform,4、read-write speed is remarkably advanced thanks to SDIO’s driving SD card. Meanwhile, software optimization is mainly about pinyin input method.Upper platform in new edition DIS refers to software but not hardware in PC. The optimization of them mainly includes:1、adopting development platform of Visual Studio2008, C++Language and latest MFC class libraries to promote software performance and maintenance accessibility;2、 reasonable interface layout. Multi-document, multi-vision, multi-tab technology is adopted to make a friendlier software operation.3、Measurement Studio8.6is employed to enhance the ability of data display and analysis;4、Excel control is used to extend the function of computing sheet;5、a clearer software functional partitioning, mainly including data acquisition, data display, file upload, computing sheet, constitutional diagram and demarcation, etc.At last, a test of all the functions in the system is given, and the related index is in line with the demand of the planning and design. The functions includes:real-time collection, file upload, computing sheet, constitutional diagram, etc. this thesis lays emphasis on the relation and coordination of each function in practical application, which gives readers a further understanding of the actual application of DIS.Of course, our ultimate purpose of the upgrading and optimization is promoting performance. However, it is not all about a mature design scheme. The balance should be achieved in user experience, resource occupation, handling ability and price cost. Considering the manufacturing process and test results, we are reasonable to believe that new edition DIS will be a highly competitive product.