Abstract: The research is focused on methods for creating parametric models of geometric objects used in modern CAD, which provide an effective modification of the descriptions of the objects of design. The authors select three approaches to creating parametric models: preliminary, parallel and subsequent parameterization. The paper describes the application of models of each type, its characteristics ad means by which they are formed. The authors note that preliminary or software models are used for the formation of the simple design of objects and drawings of design elements. Parallel methods of formation are the most common when creating graphic images of flat and three-dimensional objects of arbitrary configuration. Subsequent parameterization is used to generate parametric models of previously created design drawings. To create the latter type of models an automatic generation of basic key elements of the image grid is used. The elements adaptively change depending on the size designations assigned new values used in the original description of the drawing. As a method of study the authors use comparative analysis of different parameterization systems, allowing to identify the main approaches used in them in the formation of various types of parametric models of graphic objects. The novelty of the approach proposed by the authors of modern parametric classification systems is in the ordering of the various areas of parameterization as well as methods and means used to create a variety of parametric models depending on the time of its creation and the relation of building the corresponding image. Under this approach, it is easily to view and compare all kinds of CAD, regardless of the specific approaches and tools for creating geometric models used in these systems.

Abstract: The article deals with the issues related to the users’ access to the system of topological PC board layout without buying the license for the system because the price of the license may reach dozens or even hundreds of dollars which is not of economic benefit to the majority of developers. This leads to the growing popularity of cloud technologies that allow to get access to the design systems based on inexpensive licenses. Thus, the authors of the present article analyze different services of cloud CAD and define the most popular services. Then the authors compare different kinds of CAD PC board layout and offer to use Topological Router as the topological router created on the cloud. According to the author, Topological Router has the most beneficial features. In addition, the authors define the platform for deploying the cloud. The main research method used by the author is the comparative analysis of parameters and features of CAD PC boards and cloud deployment platforms. The scientific novelty of the research is caused by the fact that so far there haven’t been any practical implementation of WEB-oriented PC board design systems. The test case of the corporate cloud on the basis of the VMware platform has proved it possible to use cloud technologies in creating public access to the topological CAD. To deploy the full function corporate cloud and provide access to virtual CAD through web-interface it is necessary to install the additional server VMware vCenter Server 5.5.