Sharif Digital Repository

In today's world, we see an increase in competition between businesses to maintain survival in the first stage and create a competitive advantage in the next stage. To have along.To achieve this, one of the best resources that can be used by any business is to use the stored data of their users' behavior so that they can optimize their marketing plans based on data and accurate categorization. To be.In this regard, in the forthcoming research, with the help of data mining methods to categorize and evaluate them by adopting the right policies, targeted and optimized marketing activities, and more specifically in this research, using data sciences Analysis and categorization of shared bicycle... 

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 thesis, the resilience of energy supply networks and the application of Agent Based Modeling in the resilience analysis of power microgrids are studied. The main idea is to use microgrids as a solution to make power systems resilient. A microgrid with autonomous agents consisting of renewable resources, non-dispatchable generators, dispatchable generators, residential loads, critical loads, battery storages, and microgrid controller is investigated. Each agent is autonomous and has independent behavior such that the interaction between these agents produces emergent phenomena at the system level in the microgrid. In the developed model, residential consumers try to optimize their... 

In recent years, in addition to the stock market, a market has been created in Iran under the name of commodity exchange market. In this market, the product supplier announces some product specifications and buyers also announce their demand and bid price. The following two situations may occur: 1. The total amount of demand is less than or equal to the amount of supply.In this case all buyers receive the product at their bid price. Obviously, first all buyers announce a price lower than the base price so that if this happens, they can buy the required product at the lowest possible price. 2. If the supply is less than the demand, the market enters the competition. In this way, the new bid... 

Nowadays we see competition between organizations to maintain excellence and survival in business. Organizations should focus on maintaining and satisfying their customers in their services and products, because it is the customers who, as buyers of services and products, provide the company's revenue stream. With the advancement of computer technology today, a large amount of customer data can be stored and maintained. This data is a valuable resource for analyzing customer behavior and making the right decisions for the organization. Organizations need to use customer behavioral data to make their marketing activities smart and data-driven. In fact, organizations need to move towards... 

This study provides a comprehensive understanding of the digital transformation process in a constrained environment, offering practical insights for practitioners and a robust basis for future academic research. Conducted within the manufacturing industry in Iran, this research explores how companies navigate and succeed in digital transformation under the constraints of global sanctions. Employing an extreme case study methodology, the research focused on a leading organization renowned for its innovation and patented technologies. This organization offered a unique perspective on digital transformation under restrictive conditions, meeting all requirements for an "extreme case" in... 

More than 60% of sales account for materials, and so the roles and responsibilities of the material managers have been recognized as more important within a firm or in a large scale project than before. However, in many purchasing situations, different considerations conflict with one another. In these situations material planning plays an essential role in the total cost minimization process. Here, the optimal material ordering policy for an item in a deterministic time-phased demand environment with all-units discount in purchasing is considered. Based on proven properties of the optimal order policy, a tree search procedure is designed to construct sequences of orders in the optimal... 

Foam concrete is a new covering layer that can be used for several purposes in civil constructions and because of its unique physical specifications, produces a light concrete in which is isolated against thermal conductivity ,with required strength and favorite quality.This cover is made of cement , sand ,water and foam(chemical substance that produces foam) . The foam is mixed with water in a special machine (mixer) with a high speed centrifugal rotation and produces very small stable bubbles called foam. While cement and sand are mixed in special mixer, makes a fluent concrete that can be used in place, metallic or plastic molds. After dehydration, in accordance with percentage of... 

Risk is an uncertain event or condition that, if it occurs, has a positive or negative effect on a project’s objectives. Identification and assessment of risk in a measurable way are so important for project managers to decide better. This thesis studies how to identify and assess the project’s risks in Fishery industry based on the Project management body of knowledge (PMBOK 2008) as a global standard. Constructing an aquaculture site in Abadan city has some risks which are identified in the first steps of the study and in the following steps these risks will be prioritized by the use of qualitative analysis and figured out which risks have major effects on projects objectives. In last step... 

Resource investment problem is one of problems in project scheduling which concerns with gaining minimum cost for accomplishing a project in a given time. Tardiness permitted with penalty cost makes this problem close to real world. This dissertation studied constraint of resources by restricted resources and tried to gain optimal level of restricted resource and middle resources start and finish time. This problem also permits tardiness with penalty cost. In construction projects, beside renewable and Non-renewable resources, there are workshops in which part of the work to carry out an activity, is done. These workshops include welding workshops and forming workshops in piping projects,... 

The construction industry is one of the main industries in Iran, and plays a fundamental role in Iran’s economy, because construction has impact on most of other industries by its vast value chain. Selecting right sets of projects is considerably crucial for construction organizations to successfully achieve their competitive advantages and corporate strategies. Due to limited resources and dynamic changes in Iran’s construction business environment, this kind of selection is quite challenging for construction organizations. Beside’s over hundreds of selection tools, techniques, and complex selection frameworks were developed or recommended by academics and practitioners to smooth the... 

This research deals with the problem of scheduling independent preemptive jobs on identical parallel machines, to minimize the total completion time (makespan). The transportation of an interrupted job from a machine to another machine requires considering a constant transportation delay i.e., Pm|prmp(delay)| Cmax. This delay is called transportation delay. We propose a Mixed Integer Linear Programming formulation for the research problem in case of two machines i.e., P2|prmp(delay)| Cmax. Since the research problem is shown to be NP-hard, a particle swarm optimization (PSO) algorithm is applied to solve the problem approximately. Based on the frequency of using local search procedure, three... 

Project scheduling problems can be divided into different categories which one of the most important of them is resource investment problem. In this problem we are faced with a time limit for completion but resources are available unlimitedly and can be allocated to the project by specific cost. One of the most important constraints in real problems is the times that resources are available. In this research, resource investment problem considering calendar for resources has been investigated. Since resource investment problem is NP-Hard, after a brief overview of the different solutions, we used genetic algorithm to solve this problem. For this purpose, after determining chromosome... 

This project aims to study a situation in which several projects must be selected. The decision makers should select a subset of these projects taking into account the limitation of resources and scheduling. Project selection models generally do not consider schedule of project activities as part of selection process. On the other hand, except the cases where only one project is under process in each period, prioritizing the selected projects is not optimal not considering their scheduling. Projects scheduling in project activities level may increase the complexity of decision making for portfolio selection and expand the area of search for selection of projects portfolio. Therefore, all the... 

Process plants such as refineries and petrochemical plants are complex facilities consisting of equipment, piping systems, instruments, electrical systems, computers, and control systems. Process units design is mostly based on designer`s experience and design general criteria and standards. Using mathematical methods to optimize the design may have an effective role in cost reduction and it would give the designer some general view in case that the exact design is not applicable.
Optimization of Process units is described in this study. This optimization includes the exact location of each equipment, nozzle, pipe rack and also pipe route layouts. Mixed integer linear programming (MILP)... 

The multi-mode resource-constrained project scheduling problem is one of the most complex and most widely used problems in the project scheduling knowledge area and operations research science. Recently, a new type of this problem which is called multi-skilled project scheduling problem has been introduced in the literature. The aim of MSPSP is to schedule the activities regarding the precedence relationships and multi-skilled human resource constraints in such a way that the need of each activity to a subset of skills should be met by the qualified employees. In this thesis, in addition to taking the constraints of the standard problem into account, we consider a state in which the... 

Piping process is the most important part of industries projects which pay attention to construction and installation of industrial pipelines and its facilities. In the meantime, due to increasing demand of industrial units to construction and development projects, planing and scheduling the piping is necessary. We review and discuss various aspects of the piping process, optimization process and the related scheduling literature that is called Flexible Job Shop Scheduling Problem. Then, to solve the problem, considering the real world assumptions, a mathematical model, is developed and a heuristic algorithm is introduced. Also, in order to determine an appropriate bound for the optimal... 

One of the methods that we used today to manage project are calculating project progress. By which we can calculate the actual progress of project by comparison the actual plan with the schedule plan. If the actual progress,measured with less error, then the control of project done with high accuracy.Project progress are calculated in control account. For this reason, if the number of control account increased, the accuracy of the calculation increased and on the other hand whatever this control account increase the amount of time used to collect information also increases. In this study, we are looking to create mathematical model that in addition increases the accuracy of measurement,also... 

Risk management, one of the knowledge areas in project management, plays a key role in the success of projects in today’s unstable situation. The massive cost reduction achieved by risk management can manifest its importance even more in huge construction projects in gas and oil industry such as developments of power plants and petrochemical complexes. In this research, the effect of considering the correlation between risks and consequently the effect of risk action plans on other risks in their execution cost reductions has been demonstrated. A questionnaire has been designed, many experts have been interviewed, and using statistical methods, the risks’ interdependencies have been... 

In this research, the risks of power plant projects are assessed with fuzzy approach. For this purpose, "Shirkooh Yazd combined cycle power plant" is chosen as the case study. First, the risks of power plant projects before the contract and during project execution are identified. Then these risks are categorized in a hierarchical breakdown structure. Subsequently, required information is collected from experienced professionals using questionnaires that used as the input data for risk qualitative analysis. In qualitative analysis, the risk probability and its impacts (containing time, cost and quality) are described by qualitative terms. After scaling them, the amount of each risk is...