The world trade has tremendous growth in marine transportation. This paper studies yard crane scheduling problem between different blocks in container terminal. Its purpose is to minimize total travel time of cranes between blocks and total delayed workload in blocks at different periods. In this way the problem is formulated as a mixed integer programming (MIP) model. The block pairs between which yard cranes will be transferred, during the various periods, is determined by this model. Afterwards the model is coded in LINGO software, which benefits from branch and bound algorithm to solve. Computational results determine the yard cranes movement sequence among blocks to achieve minimum total travel time for cranes and minimum total delayed workload in blocks at different planning periods. Also the results show capability and adequacy of the developed model.

This paper presents two models, a periodic review model and a continuous review inventory model with fuzzy setup cost, holding cost and shortage cost. We use two methods in the name of signed distance and possibilistic mean value to defuzzify. Also we consider the lead time demand and the lead-time plus one period’s demand as random variables. To validate the models and the solution procedures we apply them to a transformer manufacturing, 'Iran transfo', company. Furthermore we design a decision support system which can be used for efficient evaluation of the proposed models in fuzzy environment.

Aggressive behavior has many bad effects on people & apos; s health care and lifestyle and any attempt to find the main issues influencing aggressive behavior among young students could help setup appropriate programs to control and possibly reduce aggressive attitudes. The proposed study of this paper performs an empirical study to find out the relationship between aggressive behavior and other important factors such as gender, age, etc. The survey uses a well-known questionnaire introduced by Buss and Perry (The aggression questionnaire, Journal of Personality and Social Psychology, 63, 452-459, 1992). The survey distributes 500 questionnaire consists of different questions based on Likert scale among 250 female and 250 male students. The questionnaire consists of various questions including anger, physical aggression, verbal aggression and hostility. The results indicate that while there is no meaningful difference between aggression attitudes of female and male students (with p-value & LT; 0.001), the aggressive attitudes increases among older male students but this aggressive reduces among female students as they get older.

The present research purpose is applying a compose method from DEA and AHP for removing this technique deficiency on assessing. For this reason, a compose method on basis of unsubjective double comparisons matrix has been used. At research process, after specifying the input and output variables and also a proper model for DEA, computational research method are dismounted at two stages: At the first stage, DEA model, is dismounted for two-by –two of items (branches), regardless to other items. At the second stage, double items comparisons matrix is provided from first stage results, that is performed total rating by resolving a unit – level AHP model. For this purpose, for dismounting this technique, we have attempted to assess rivet producer units efficiency, at one of the greatest industrial units in Iran. Results indicate unit number 3 with efficiency amount 0.12622 has allocated the highest rate to own and unit number 1 and 2 with efficiency 0.12404 has allocated the least rates to own.

:In this paper, we present a multi-objective possibilistic programming model to locate distribution centers (DCs) and allocate customers' demands in a supply chain network design (SCND) problem. The SCND problem deals with determining locations of facilities (DCs and/or plants), and also shipment quantities between each two consecutive tier of the supply chain. The primary objective of this study is to consider different risk factors which are involved in both locating DCs and shipping products as an objective function. The risk consists of various components: the risks related to each potential DC location, the risk associated with each arc connecting a plant to a DC and the risk of shipment from a DC to a customer. The proposed method of this paper considers the risk phenomenon in fuzzy forms to handle the uncertainties inherent in these factors. A possibilistic programming approach is proposed to solve the resulted multi-objective problem and a numerical example for three levels of possibility is conducted to analyze the model.

Earth subsidence has been one of the important issues jeopardizing environment and there are many studies, which blame shortage of underground water resources for having uplift and subsidence. However, many argue such conclusion and believe that earth subsidence has been studied in the past without considering the changes in the hill over a long period. In this study, we use SAR interferometry study to investigate earth subsidence in dessert areas of Esfahan, Yazd and Ardakan, located in central part of Iran. The results indicate that there are more important issues affecting subsidence such as the uplift in the hills located the desert area. The results of the survey based on SAR interferometry reveals that subsidence occurs with the uplift in the adjacent hills, simultaneously called Soft isostasy in geomorphology. In other words, the subsidence is more associated with the movement of the surface of the desert to reach equilibrium than shortage of underground water resources. There is an equilibrium line between the uplift and subsidence where is changes of the surface tends to zero.

Tourism is one of the fastest growing sectors in the world and a major driver of growth for developed countries. To maximize the tourism sector & apos; s economic benefits‚ tourism development‚ planning and strategies not only have to focus on increasing demand and supply‚ but also they must concentrate on raising the level of value retention and on value creation and value co-creation within the sectors. Serious policy in one of these sectors may threat the whole tourism value chain. This makes analysis of the sector complex but crucial as it could be the catalyst for wide spread reforms. To offer a better tourism product, one should understand the sources of critical factors (ie: environmental, industry and organizational factors) for competing either domestically or internationally. Comparative and competitive advantages, information and communication systems and E-tourism, knowledge of value and value chain (identifying and analyzing the specific activities through which it can create value for its customers) all are the perquisite for value creation and value co-creation (the source of value lies in the personalized experiences that are unique to each individual customer). To achieve these, special attention must be devoted to strategic management, planning and society, in order to satisfy all stakeholders & apos; expectation. Based on the above paradigm a model for value creation in tourism is proposed in this paper. It is hoped that this study could drive destinations to create and co- create the values that makes a unique and memorable experience for each tourist.

One of the necessary actions in many organizations is to reduce the number of workers in an attempt to restructure business activities. However, layoff could have negative consequences since many employees may decide to leave since they lose their tolerance. The layoff must be accompanied with some supportive plans to reduce stress among the remaining workers and increase their commitment for long-term work. The present study of this paper considers the effects of layoff on job satisfaction and commitment among the remaining employees of a detergent producer unit. The results indicate that a good supportive program including wage increase, family support, health care plans, etc. could significantly improve employee long-term commitments and it leads to job satisfaction.

Social welfare plays an important role on helping needy people build their future. There is no doubt that a good social welfare program in any country could indirectly reduce rates of crimes and violence. In this study, we examine the quality of life between welfare receivers and ordinary people. The proposed study of this paper designs a questionnaire consists of nine questions and distribute between two groups of 50 people. The questions are based on Likert scale from very low to very high and the feedbacks are analyzed using some statistical tests. The results indicate that typical ordinary people have better life style in terms of nutrition, healthcare, housing and shelter, education, employment, income, social relationships, marital status, entertainment than welfare receivers do.

The purpose of this paper is to measure the relative efficiencies of various cow husbandries. The proposed model of this paper uses distribution free analysis to measure the performance of different units responsible for taking care of cows. We gather the necessary information of all units including number of cows, amount of internet usage, number of subunits for taking care of cows, amount of forage produced in each province for grazing livestock and average hour per person training courses as independent variables and consider the amount of produced milk as dependent variable. The necessary information are collected from all available units located in different provinces of Iran and the production function is estimated using a linear programming model. The results indicate that the capital city of Iran, Tehran, holds the highest technical efficiency, the lowest efficiency belongs to province of Ilam and other provinces mostly performs poorly.