用C语言实现面向对象研究

C语言是目前世界上最流行、使用最广泛的高级程序设计语言之一,具有高效、可移植性好等优点,特别是在嵌入式领域有着广泛的应用。随着程序的代码量不断增加,相应地应用也越来越复杂,因此C语言结构化的编程方式在某些方面显得有些力不从心,而适合这种应用的面向对象编程方式越来越被广泛地使用。可纯粹地面向对象的编程语言如C#J、AVA等又不适合应用在原本C语言应用地领域,特别是嵌入式方向。通过变通地用C语言的Struct结构从而实现面向对象编程方式,既可以保留C语言特有的优势又可以结合面向对象编程,从而编写出更加高效、健壮且可扩展性更好的应用程序。

Integrating cross-sensor high spatial resolution satellite images to detect subtle forest vegetation change in the Purple Mountains,a national scenic spot in Nanjing,China

Accurate information on the location and magnitude of vegetation change in scenic areas can guide the configuration of tourism facilities and the formulation of vegetation protection measures.High spatial resolution remote sensing images can be used to detect subtle vegetation changes.The major objective of this study was to map and quantify forest vegetation changes in a national scenic location,the Purple Mountains of Nanjing,China,using multi-temporal cross-sensor high spatial resolution satellite images to identify the main drivers of the vegetation changes and provide a reference for sustainable management.We used Quickbird images acquired in 2004,IKONOS images acquired in 2009,and WorldView2 images acquired in 2015.Four pixel-based direct change detection methods including the normalized difference vegetation index difference method,multi-index integrated change analysis(MIICA),principal component analysis,and spectral gradient difference analysis were compared in terms of their change detection performances.Subsequently,the best pixel-based detection method in conjunction with object-oriented image analysis was used to extract subtle forest vegetation changes.An accuracy assessment using the stratified random sampling points was conducted to evaluate the performance of the change detection results.The results showed that the MIICA method was the best pixel-based change detection method.And the object-oriented MIICA with an overall accuracy of 0.907 and a kappa coefficient of 0.846 was superior to the pixel-based MIICA.From 2004 to 2009,areas of vegetation gain mainly occurred around the periphery of the study area,while areas of vegetation loss were observed in the interior and along the boundary of the study area due to construction activities,which contributed to 79%of the total area of vegetation loss.During 2009–2015,the greening initiatives around the construction areas increased the forest vegetation coverage,accounting for 84%of the total area of vegetation gain.In spite of this,vegetation loss occurred in the interior of the Purple Mountains due to infrastructure development that caused conversion from vegetation to impervious areas.We recommend that:(1)a local multi-agency team inspect and assess law enforcement regarding natural resource utilization;and(2)strengthen environmental awareness education.

Abstract of ph.d Dissertation

With the rapid development of global information highway,multimedia communication technology plays a more and more important role in national economic and social development.However,the multimedia communication system is a complicated real time distributed system and its software is difficult to develop.In order to improve the rapid development and application of the multimedia communication technology,there is an urgent need to carry out the basic research work of software development platform in this field.……

Modeling FMS Using Rule-based Object-oriented Petri Net

n this paper, a Rulebased Objectoriented Petri Net(ROPN) for FMS modeling is presented throuth analysis of FMS components and their characteristics. The advantages of traditional Petri net and objectoriented technology are combined, and the scheduling decisionmaking rules in FMS modeling are also considered. The results reveal that ROPN provides an effective and efficient tool for analyzing, designing and scheduling FMS.

An Engineering Framework System to Support Integrated Product and Process Development

n engineering framework system to support integrated product and process development is developed. It consists of the product data management level, development tool level, and development process management level. The product data management level supplies an integrated information environment to enable a multifunctional team to work efficiently by using a product data management system. The development tool level is made up of many standalone software tools for product development. These software tools are encapsulated in the product data management system. In the development process management level, the object classes involved in product development and the static relationships among these object classes are constructed using objectoriented approach. An IDEF3 process flow diagram for a product development process is described. The process flow diagram is directly transformed into its corresponding objectoriented Petri net(OPN) model. The conflicting events specified by the OPN model are analyzed. The control strategy for resolving each conflict event is provided. Through the mapping between IDEF3 process flow diagrams and life cycles in the product data management system,a development process manager for constructing and controling flexible product development processes and automatically capturing the rationales for design decisions is built.