Sharif Digital Repository

Environmental conditions have a significant effect on the performance of flexible pavements. External factors such as precipitation, temperature, freeze-thaw cycles, and depth to water table play a key role in defining the extent of the impact the environment effects on pavement performance. All types of pavement distress are either caused or aggravated by the environmental factors. Up until now, pavement design in Iran is done according to the AASHTO 1993, which is based on methods that have evolved from the AASHTO Road Test that was conducted at one specific geographic location. The newly released Mechanistic Empirical Pavement Design Guide (MEPDG) by the addition of climatic input makes... 

A pavement management system (PMS) is a set of tools that aid the decision makers in finding optimum strategies for maintaining pavements in a serviceable condition over a given period of time. A frame work for pavement management system for Iran was proposed by Tabatabaee et al. with the support of Transportation Research Institute of Ministry of Road and Transportation. In the proposed frame work, two horizons of development, short and long term, have been envisaged for more rapid and efficient utilization of the system within the technical and administrative divisions of the Ministry. This thesis describes the software package developed based on the proposed frame work for the... 

According to epidemiological studies, low back pain is the most prevalent musculoskeletal disease thus indicating the important role of biomechanical engineers to manage risk of injury. Different quantitative (i.e., biomechanical models) and qualitative (empirical) assessment tools are used to evaluate risk of musculoskeletal injuries. The present study uses various quantitative and qualitative risk assessment tools to investigate the risk of injury among workers in Iran Khodro Automaker company (IKCO) assembly hall No. 3 (Pars Peugeot car assembly). Moreover, different engineering and administrative interventions are suggested to manage risk of musculoskeletal injuries when needed. The... 

Energy industries in many countries have initiated the process of privatization. Restructuring of energy systems is usually started with dividing the vertically integrated national systems into regional companies. Due to the geographical dimension of energy systems and natural monopoly in many activities, the process of privatization has started with segmentation of the vertically integrated national systems into regional companies. Thus, regional independent companies are formed that include a collection of producers and consumers of energy in their geographic area. These regional companies are economic entities who are pursuing a policy of maximize profit. On the other hand, exchange of... 

The growing requirements for renewable energy production lead to the development of a new series of systems, including wave and tidal energy conversion systems. Due to their sensitivity and the impact of the aggressive marine environment, the selection of the most adequate location for these systems is a major and very important task. Several factors, such as technological limitations, environmental conditions, administrative and logistic conditions, have to be taken into account in order to support the decision for best location. The aim of the present study is to provide an Atlas of IRAN Offshore Renewable Energy Resources (hereafter called ‘the Atlas’) to map out wave and tidal resources... 

An important characteristic of sea waves is their high energy density, which is the highest among renewable energy sources. Many different types of wave-energy converters of various categories have been proposed yet. In this thesis the performance of a novel wave energy converter (WEC) is studied. The system, extracts the wave energy from heaving motion of a cylinder buoy in head seas. This heaving cylindrical floating buoy is tested with sinusoidal incident waves in a wave channel in marine engineering laboratory, Sharif University of Technology (SUT). The study begins with a thorough review on types of renewable energy and their application in Iran. Then an introduction to ocean wave,... 

This thesis examines the impact of daylight saving time policy on electricity consumption in Iran. After World War I, many countries gradually implemented annual time change laws to extend daylight availability. This involved moving a specific amount of time (usually one hour) forward in early spring and back in early autumn. Historically, the majority of the electricity load on power grids was due to lighting, so this decision made sense. However, with technological advances and diversification of electricity usage, this decision is now being questioned, particularly in light of air conditioning loads, which make up a large part of electricity usage in Iran. These loads have the potential... 

Power systems aredynamic and complex systems that are always subject to continuous changes and disturbance. Power system stability is a requirement for its satisfactory utilization. High speed Automatic voltage controllers with high gain tend to deteriorate both the electromechanical oscillation damping and small signal stability margin. Power system stabilizer (PSS) is a complementary controller that uses exciter voltage reference modulation to improve the electromechanical oscillation damping and stability margin. Optimal operation of PSS requires appropriate tuning according to the grid and power plant characteristics. In a largepower grid, absence or improper tuning of PSSs may cause one... 

The challenges of urbanization have been the focus of researchers since the past. With the expansion of urbanization and massive migration of people from villages to cities, these challenges became more important in our country. These issues, which exist in many other countries in a serious manner, are discussed in the branch of urban economy in the world. This thesis is arranged in three chapters, in each of which one of the aspects related to urban economy and housing is discussed. In the first chapter, the effects of the construction of Mehr housing on the value of nearby residential properties are investigated using difference-in-difference method. It is shown that the construction of... 

Population growth and the escalating use of electric devices have led to a surge in electricity demand. However, the construction of adequate infrastructure to meet this additional demand is highly expensive. To address this issue that sometimes causes power outages, dynamic pricing for electricity, a demand management technique, has gained significant importance. By employing this method, prices can be adjusted on an hourly basis, enabling consumers to regulate their consumption in response to these price fluctuations. The prices can be determined based on different objective functions. This research aims to develop a comprehensive framework for determining the optimal hourly electricity... 

In this study, a smart grid algorithm based on pricing and by considering a model in the electricity market is presenting, which is focused on reducing the cost of production for the supplier as well as increase the utility for the electricity consumer. The algorithm has been also modeling by considering multiple suppliers. The model has been designing by taking the home subscribers in to account and to increase their social welfare. The difference between the following developing model compared to the other ones, which are presented so far, is the consideration of the competition between suppliers and the real-time pricing conditions. In fact, in this model, the price of electricity has... 

Decision-making about make or buy is one of important and strategic decisions. Any wrong decisions in this regard can cause high costs to organizations. About this make or buy decision, there is rich literature and experts of different scientific fields such as economy, sociology, industrial engineering, and management, etc. study about it. According to importance of make or buy decisions in research organization and self- sufficiency Jihad as a supportive organ from IRIB in order to make needed products of this organization, the main purpose of this research is to provide and present a conceptual framework to help make or buy decisions for this organization. The research method in this... 

In recent decades many countries have attempted to measure and formulate customer satisfaction index (CSI), as an important factor in micro and macro-economic level. In developed country CSI has the same value of GNP. Customer Satisfaction Index model actually represents the relationship between primary factors of satisfaction and satisfaction results in the macro level for a country and includes all business aspects. In many countries, industrial companies have a wide range of products and providing Customer Satisfaction Index model for this aspect which can be a base of presenting national customer satisfaction index model. Accordingly, the main goal of this study is providing an Iranian... 

Maintenance is one of the most important factors increating an efficient and stable structure intheindustry. Therefore, having an efficient and effective system in this case is very important. In this regard, the Preventive Maintenance Program is considered asone of the most important factors in the productivity and efficiency of machines and manpower.Therefore, designing this system forthemachining zone of Iran Khodro Peugeot 405 Engine Manufacturing hall # 2can have further Improvement In the Efficiency of the plant.
The project was carriedout through the following steps:
- Research and data collection
- Classifying and organizing
- Implementation
In the first step... 

In this study it is attempted to investigate the impact of macroeconomic variables on the determination stock price in Iran.In this study it is used quarterly time series data of stock price and also macroeconomic variables including Growth of Consumer Price Index(Inflation), Iran Crude Oil Price, Exchange Rate, Gold Price, Liquidity, Money Supply and Gross Domestic Product for a period of 10 years (1381:1-1390:4). Data is obtained from monthly and quarterly reports, available on the website of the Central Bank of Iran and Tehran Stock Exchange Organization. In the analysis of the collected data, It is applied unit root tests, test for co integration, and utilize a Vector Auto Regressive... 

The aim of the present research is to examine improving the technology in terms of technical and engineering dimensions and also assessing their long-term economic & social advantages. The population of the research consists of top managers, middle managers and technical experts working in power plants situated in the west of Iran (Kermanshah, Kurdistan and Ilam). According to the research aims, this research is a practical survey trying to explore a model consistent with the subject of research, i.e. improving the condition of technology in electronics industry. The utilized instrument in this research is a questionnaire with a reliability level equal to (α = 0.754.) The validity and... 

Productivity is a widespread context that has been considered in several levels and different sights. Improving productivity has comprehensive effects on economic principal, social and politic phenomenon of society like decreasing inflation, increasing welfare levels, increasing preoccupation levels and political contest potency . In this research the non-parametric output-oriented Malmquist DEA method has been used. Malmquist TFP index method has a major advantage, by allowing the decomposition of TFP growth into efficiency change and technical change. In this research Malmquist index has been calculated for 33 generating' companies, 16 transmission' companies and 37 distributing'... 

This project shows the flow of implementing a 5s Program into a factory. From it’s first step by studying current situation until the last step implementing and monitoring the results. Manufacturing companies have a growing, market-driven need to adopt World Class operating technologies, including lean manufacturing 5S principles. Understanding the program's importance and knowing how to get started are the most important steps. In Iranian economic environment it is always hard to convince any top management to invest on methodologies like TPM. The reason behind this is that there are very few examples of companies with successful implementation of these methodologies. Since management... 

In this research the risk of oil price for Iran and Opec basket is studied. Several methods in order to estimate Value at Risk (VaR) such as Standard Historical Simulation, Historical Simulation with Autoregressive Forecast, Historical Simulation with moving average forecast, and ARMA are examined. The experiment is performed based on daily oil prices, from January 2005 to December 2009. The data is divided into two smaller time periods. The first, from 2005 to 2008, was used to estimate the model coefficients. The second part of data, i.e., the data gathered in 2009, was used for forecasting purposes. The result of experiment show that Historical Simulation with Autoregressive Forecasts...