Sharif Digital Repository

Cost Estimation plays an essential and role in UAV (Unmanned Aerial Vehicles) Projects. By increasing the complexity of new unmanned systems, the importance of this task augments. Additionally, up to now, a comprehensive approach has not been adopted internationally. But in parallel a number of international companies and organizations has developed specific methods by themselves; confined to their corporate.
This project pursues developing a complexity-based model for cost estimation of unmanned aerial vehicles, especially Jet UAVs. However, it’s anticipated that this model may be utilized for all kind of systems, but it seems that jet UAVs use it with a better and more reliable... 

Clean and Renewable energies are one of the most important part of global policy. In order to reduce greenhouse gas emissions mostly from fossil fuels, many countries have introduced biofuels to avoid depletion of fossil fuels and decrease the pollution. In Iran, large dependency on crude oil and natural gas resources cause barriers for utilization of biofuels. The country has plenty of biomass resources that may guide national decision makers toward biofuels.In this study, biomass supply chain to produce biofuel is studied to reach sustainability. The model enables us to depict the optimal path to reach the economic, environmental, and social sustainability through the whole supply chain.... 

Today, building sectors account for 34% of total energy consumption in Iran. Increasing demand of the comfort level along with population growth necessitates much more attention about energy requirements in the country. Such phenomenon has already raised concerns about the heavy environmental impacts. The present research studies minimization of global warming potential effect for an educational building by developing life cycle optimization model. The Department of Engineering of Sharif University of Technology is selected as the case study and optimal solutions has been achieved for this building. Results state that implementing cogeneration and renewable energies can reduce20 -25% of the... 

The main objective of the present work is to achieve green design of a methanol plant by using life cycle process design (LCPD) and multi-objective optimization. As a starting point, simulation of Lurgi’s combined reforming process as a conventional reference methanol case (RMC) was performed in order to obtain its operational and kinetic parameters as well as its environmental impacts. The environmental concerns were calculated using one of the modern environmental impact assessment methods, i.e. life cycle assessment (LCA). To perform life cycle assessment of RMC, methanol production plant as well as its auxiliary units should be considered. The auxiliary units in the RMC include cryogenic... 

By changing the approaches towards the waste management, it is possible to affect the resource depletion. This research is focused on economic and environmental impacts of waste production and treatment. In this research, the municipal solid waste management system have been evaluated by an integrated approach considering the Life cycle assessment and Emergy assessment methods. The integrated method have been used to evaluate the waste management system more fundamentally and analyze some upstream indicators which are related to natural resource scarcity. At first, some scenarios have been developed based on Life cycle assessment containing possible configurations of technologies. Then, an... 

Damming projects always have been important while construction, operation and even demolition due to their major effects on society, environment and economy. Although researchers have focused on one or a few phases of construction projects to develop sustainable infrastructures, the research community has to consider long term effects of developments too. There are a variety of such effects that ignoring them will cause construction of not convenient infrastructures i.e. air pollution and over-consumption of energy resources while construction, operation and demolition. Therefore, it is suggested to consider life cycle assessments to include all bad effects in all phases of a project. Dams... 

For increasing longevity of a structure, it is not enough to notice only to designing aspects. In operation phase of a construction, we can increase the level of service and longevity. Asset-based Organizations, in addition to design their new assets, should maintain them. Infrastructures, such as road, bridge, dam, and water network, are important because of social and economic aspects. So they need special attention. There are efficient models for infrastructure maintenance that consider infrastructure element information, such as condition rate, weight, dimensions, deterioration rate, and cost of maintenance as inputs and give planning for maintenance in future. This planning, involves a... 

One of the biggest challenges in software companies is reaching a common understanding between staff members across the organization with different expertise. If not solved, this problem could cause other organizational problems, such as project failures, lack of innovation in new products, organizational conflict, and even interppersonal conflicts between employees and/or managers. Recent research has shown that boundary objects can help decrease knowledge gaps between workers.This research reviews boundary objects’ properties, life cycle, and effects by investigating some boundary objects in a startup software company. This research’s goal is to increase the knowledge about boundary... 

Preserving and promoting the health of citizens in a society is one of the most important problems addressed in any country. The power sector discharges a huge volume of carbon dioxide which intensifies the climate change and consequent human health problems.The goal of this study is to evaluate the ultimate effect of climate change caused by power plant emissions on the human health using life cycle analysis approach for different provinces in Iran. An integrated model has been developed to evaluate the impact of climate change due to power plant emissions on the human health. This model includes the equations regarding the variations in carbon dioxide concentration in the atmosphere,...