Sharif Digital Repository

In nanometer technologies, the effect of process variation is observed in Multi-Processor System on Chip (MPSoC) in terms of variation in processors‟ frequency and leakage power. Traditionally, only worst case values of the system parameters were concerned and a worst-case optimization algorithm was employed for an application under design. As previous researches have shown these algorithms are not optimal in terms of parametric yield compared with newly employed statistical optimization algorithms. In this project, we have considered the problem of simultaneously selecting MPSoC architecture (which includes type and number of processors and the communication media) and task and... 

In this thesis, we focus on some internal organization issues of the supply chain; in particular, we analyze some network design problems which are typical of producer companies. The aim is to optimize the flow of goods through the literature distribution network, from the plants where the goods are produced (supply points) to the demand points, which are essentially distributors such as wholesalers or retailers. The system addresses a class of distribution network design problems, which is characterized by multiple product families, a central manufacturing plant site, multiple central warehouses and distribution center, and retail outlets (customer zones) which demand multiple units of... 

In most countries Frequency control services as one of the Ancillary services are presented in market scheme. Frequency control are used in different levels to balance generation and demand. Each reserve levels is implemented with specific characteristics and rules. Clearance of energy and one control reserve has some drawbacks so in this thesis we try to clear energy and different reserve levels simultaneously. Each reserve level is determined with special criteria. This criterion in primary reserve is frequency deviation restriction and unit commitment risk in territory reserve that is determined by system operator. In this thesis these two criteria are formulated in linear form and... 

Upstream Oil and Gas due to the high energy consumption offer multiple degree of freedom that can be exploited to reduce capital and/or operating costs. Be use combination of optimization methods (Retrofit and Operational Problems) due to the complex nature of the optimization in UOG. To achieve the optimization Details need to identify relationships between variables. System modeling based on demand in two categories, can be divided: the demand for water and oil based and model based on electricity demand. Existing and new technologies in both evaluated and identificated the application of the system in upstream sections. The linear programming model used to determine the export of... 

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)... 

Wireless Sensor Networks (WSNs) consist of few hundred to thousand sensor nodes that are usually deployedrandomly in a sensing field. The duty of sensor nodes is to sense the environment for data collection and sending these data to a sink node for future processes. Sensor nodes are equipped with a non-rechargeable battery. Hence, network lifetime is an important issue in WSNs. When a static sink node is used in a WSN, sensor nodes that are located in the neighborhood of the sink node willdrain out of energy faster than other sensor nodes which are farther away from the sink node, because traffic load is heavier on sensor nodes which are closer to the sink node. This problem is named “the... 

Single floor facility layout problem (FLP) is related to finding the arrangement of a given number of departments within a facility; in multi-floor FLP, the departments should be imbedded on some floors which are inside the facility. The significant influence of layout design on effectiveness of any organization has made FLP an important issue. This paper presents a three (two) stage mathematical programming method to find competitive solutions for multi (single) floor problems. The first stage assigns the departments to the floors by using a mixed integer programming model (the single floor version does not require this stage). The second stage uses a nonlinear programming model to specify... 

Given the importance and the need to strengthen the agricultural sector within the national development strategy, it is necessary to meet the different needs of the agricultural sector in different areas. Since the activities and diversify the agricultural sector, the industry must be tailored to geographic locations.Unlike the studies so far, we in this research in order to achieve a proper and efficient planning, effective dimensions of the chain as an integrated review and a network of supply chain, production and distribution of agricultural products, livestock and processing industries have designed, so that we can have a comprehensive plan for each of the sectors of agriculture,... 

This study investigates the bundle pricing strategy in which a seller offers both individual products and a bundle comprising one unit of each individual product. Moreover in order to motivate costumers, usually a discount is offered for the bundle option. This strategy is an important price discrimination tool for companies that serve customers with heterogeneous preferences and implementing it can maximize seller’s expected profits. In this study two mathematical programming models for the mixed bundle pricing problem are developed. The first model investigates the inventory and ordering decisions in this problem. In order to solve this model, a solution approach based on the benders... 

In this study we addressed the problem of separated waste management. Investigating the literature on location routing problem, reverse logistics, waste management, and countries’ performance in the field, we proposed a novel method for gathering household waste that inspired from prosperous metropolises and took into account the particular situations of developing countries. As a matter of fact, the proposed method is an extension of location routing problem; it’s a bi-echelon network of facilities and multi-compartment vehicles connected via reverse cross docks. The problem is formulated using a mixed-integer linear model with 3 economic, social, and environmental functions; with respect... 

Recently, elastic optical networks have attracted high interest to provide more efficiency and scalability in optical core networks. Due to the high transmission rates and the importance of the transmitted data in these networks, a failure may cause vast data losses. Thus, addressing the problem of survivability in these networks is of great importance. According to different time domain behaviors and reliability requirements of incoming traffic, supporting different quality of services is another important concern. On the other hand, using multi-core fibers is a way to scale the network capacity to provide high-speed transmission services but there is a concern that the inter-core crosstalk...