Productivity improvement from economic concept to an engineering tool

In broad terms, productivity is defined as the ratio of all outputs to all inputs. In this paper, productivity is distinctly used as an engineering tool and from practical viewpoint. With such engineering look, productivity is an adequate tool for evaluation of the advancement in competitive market, work assessment, profit/loss analysis, decision and even developing or changing the activity. Productivity measurement seems to be an easy task but this is a misconception. In fact the concept remains to be one of the most complex and unknown criteria. It is for this reason that attempts have been made here to accurately define productivity and hence simplify its measurement. A case study has been adopted and the productivity of Eastern Alborz Coal Mines in Iran has been calculated for years 2001-2008. The resulting values and the component models are then subject to analysis. These results are examined in terms of practicability and it is shown that the method prescribed is a pragmatic approach in all similar system situations

Presentation of measurement model for total productivity in Iran's central iron ore Deposit-Bafgh Co. using group decision making method

Group decision is usually made using ordinal and cardinal methods. Group decision making is used in this paper by applying binarycomparison, and two calculating methods were used including Calculation of λmax and comparable particular victor from analysis matrix Dmxm and Calculation of particular victor from matrix Dmxm by approximate method. The methods were selected based on the ideas of a number of sophisticated mine experts. In order to measure the efficacy in the company, the costs for human resources, energy, materials, and the capital were taken into account. Then, the costs were evaluated and prioritized. Having taken them into consideration, priorities in cost management were determined. The major purposes behind that were increasing total productivity and determining its formula in Iran's Central Iron Ore Company in Bafq