the object of this study was to investigate growth sources of agronomic products in iran. to achive our object, we used fan's frontier production function approach, which includes input changes, technical changes and institutional changes. the study conducted for the period between 1977 and 2011 years. results of adf test showed that all variables were integrated of order one. in addition, joha...

Background. Considering that a person's physical and psychological possibilities are not limitless, the technical means used by athletes are of great importance. In order to achieve high results in the kayak sprint competition, users-athletes orient to the highest quality products; therefore, a significant task falls to their manufacturers to analyze the competitors' products, evaluate users' n...

In today's design, system complexity and increasing demand for safer, more efficient and less costly systems have created new challenges in science and engineering. Locomotives are products which are designed according to market order and technical needs of customers. Accordingly, targets of companies, especially designers and manufacturers of locomotives, have always been on the path of progre...

IS design today is driven primarily by technical and functional requirements, and the economic implications for design are not yet well understood. This study argues that system design and architecture must reflect assessments of economic trade-offs besides satisfying technical/functional requirements. Modeling the economic performance structure behind IS design can highlight these trade-offs a...

Software systems are not purely technical objects. They are designed, constructed and used by people. Therefore, software design process is not purely a technical task, but a socio-technical process embedded within organizational and social structures. These social structures influence and govern their work behavior and final work products such as program source code and documentation. This pap...