Abstract. The present research aims to identify and analysis the effectiveness of rangeland management cooperatives in Gonbad city. The study was conducted in 2015. The research was performed in descriptive manner as survey method. The subjects (participants) included all members of rangeland management cooperative in Gonbad city. The sample size was determined by Cochran (n=200). For sampling ...

The complexity and the extension of tasks in the world today demand an extensive interaction among people with different knowledge backgrounds, who need to work in cooperation, aiming at a common goal. In this paper, we present a method to model the tasks and actions that a group of users carries out when working cooperatively through a computational system integace. For this purpose, we use sc...

This paper focuses on turbo packet combining for hybrid AF/DF multi-relay systems operating over multipleinput–multiple-output (MIMO) broadband channels. We consider virtual antenna based combining strategy that has been widely studied for the point-to-point hybrid ARQ. However, the extension of this combining strategy to hybrid AF/DF cooperative communications is not straightforward. In this p...

In recent years, farming section of South Khorasan Province faces different limitations such as increasing shortage of water resources and continuous reduction of weather showers.Considering consecutive droughts and water crisis in agricultural plain of the province, it is necessary to use water resources optimally and increase productivity of water shortage input. Comparison of water productiv...

Farmers need up to date information on efficient use and management of labour for agricultural production. Yet, they lack adequate and needed information. Hence, this study was undertaken to explore the sources and use of labour information by farmers in southwestern Nigeria. Multi-stage sampling procedure was used to select respondents for the study. Primary data were collected to elicit infor...

The MARS system is described which models cooperative scheduling witldn a society of shipping companies as a multiagent system. Emphasis is placed on the functionality of the system as a whole -the solution of the global scheduling problem emerges from local decision-making and problem-solving strategies. An extension of the contract net protocol is presented; we show that it can be used to obt...