The article deals with topical issues at the pre-investment stage of project design to justify decisions on the feasibility of further investment and the transition to the next stage of design - the development of project documentation. At the pre-project stage, there is often a situation when the parameters of structures have not yet been determined, and capital investments must be evaluated. Methodological approaches to determining the cost of gasification facilities and the estimated model of cost calculations at the stage of investment justification with the help of enlarged indicators that improve the accuracy and validity of calculations at the stage of pre-design studies are substantiated. It is shown that the enlarged indicators used at the stage of investment justification form the regulatory basis for determining the cost of gasification facilities, for estimating capital costs, as well as for evaluating the effectiveness of investments in the selection of project options. The object of the study adopted electrically welded steel pipes and polyethylene pipes for gas pipelines. Evaluation and forecasting of the cost of gas distribution systems in the article are proposed using regression models depending on time and diameter of the pipe. The regression dependences of the cost of steel and polyethylene pipes of all standard sizes and confidence intervals for the cost of pipes allow to estimate also possible errors of the forecast cost estimation.

No abstract

In designing of corsetry the essential feature is figure's torso and breast form and size setting. Personal figure digital mannequins, obtained by the most 3D Body Scanning technologies, don't provide the ability to modify the shape of the breast and monitor the preservation of its main parameters during model design. We have developed a mannequin mathematical model and an adjustment method to recover personal torso and breast geometry. For making breast simulated model, setting of different figure types, either in brassieres of different designs, or without them, methods of geometric and physical modeling were used. As a geometric model the part of ellipsoid was chosen, which represented a rotary body, formed by certain function graphics. For obtaining ellipsoid forms which are typical for the large breast size and for women of the older age group, physical modeling was used. Eight different parameters, sufficient to generate all possible forms of breast, are defined. Our adjusting procedure needs only two photographs and 6 measured values. Shape of torso is adjusted automatically using outlines deposited on the pictures, and values of the chest, waist and hips girths (Fig.2). Breast shape is adjusted interactively by changing the values of 8 parameters of the mathematical model (Fig.3). These parameters can be used further for modeling of brassier effect on the breast when 3-dimension corset wear construction is made. Adjusting process takes less than 5 minutes, after which the designer can create a model of the corset, draw seams, reflect the properties of materials (Fig.5) and receive a set of patterns automatically, without any usage of various methods of receiving patterns. Advantages of our program are visualization of clothes appearance, availability of fitting it on the individual figure (Fig.6) and automated algorithm to convert three-dimensional details of clothes in the patterns.