Sharif Digital Repository

Nowadays energy consumption becomes an important design factor in communication systems because of financial reasons and environmental concerns. There would be many equipments with large energy consumption in next generation (5G) networks, so energy efficiency will play an important rule in these networks. Two alternative techniques used for energy consumption management are energy harvesting and simultaneous wireless information and power transfer (SWIPT). A useful scenario in SWIPT is to use received energy for future transmissions. In this scenario, the design of encoder and decoder is a new open problem, because of the memory now appeared in the system. Thus to understand the interplay... 

In this thesis, we analyze the degree of freedom (DoF) of wireless multi-user networks in the presence of smart radio environment. The two most important wireless multi-user networks, K-user interference channel, and M*N wireless X network are considered and the effects of the presence of a smart radio environment on the DoF of these networks are evaluated. To this end, first, we consider Intelligent Reflecting Surfaces (IRSs), which are a practical model of smart radio environments and can control the propagation of waves toward the desired direction in the environment. Then, we consider the instantaneous relay as a general theoretical model, which is the most comprehensive model for smart... 

Although, planning and control systems improved, but most of projects have some Problems such as long time and high cost. In project oriented organizations which Perform several projects have more problems. An important reason of these Problems is lack of skill and competency of executive factors and project managers In planning and control. These persons are chosen base on organization Relationship, not systematically. One way to become successful in projects is Chose and assessment of project managers and executes in right way. "System of Competency and assessment of project manager" is offered to solve this problem. According to this system, at first projects are defined and grouped base... 

Today, the major part of the capital of each country, especially developing countries, is devoted to its construction and construction projects. On the other hand, one of the growth and economic factors of any society is the success of its development projects. In fact, one of the activities of developing countries to build economic infrastructure is the implementation of infrastructure development projects that account for the bulk of the country's budget annually, and therefore the principled planning of these projects is from the requirements and it is necessary to achieve the lowest cost-to-productivity ratio. In Iran, which is considered as a developing country, a significant amount is... 

This research attempts to develop the optimal solution for an inventory problem consisting of a single machine which produces items some of which may be defective. We assume that no shortages are allowed and all defective items are to be reworked. Setup cost for rework and waiting time of defectives are considered. This research consists of two different parts. In the first part we consider two different policies where in the first policy in each cycle after the regular production the machine is setup for the rework of defectives of the same cycle. In the second policy several cycles constitute a period. All the defectives produced in the period are reworked in the last cycle of that period.... 

Opportunities for creating value are shifting from managing tangible assets to managing knowledge based strategies that deploy on organizations' tangible assets: customer relationship, innovative products and services, high quality, and responsive operation processes, information technology and databases and employee capability skills and innovation" (Strategy Focused Organization, Norton, Kaplan; 1996). As organizations' value creating process shifts, learning has become one of the most important factors in value creation, and as a consequence dynamic capabilities creation. This research is concentrated on Electric Distribution Companies in Tehran region and studies knowledge management as... 

Human body is subjected to body accelerations or vibrations in several circumstances. During gravitational changes, the hydrostatic pressure gradient along the body axis changes, and then body fluids are redistributed. Prolonged exposure to high level external acceleration may lead to serious or even fatal situations on account of disturbances in blood flow. Due to physiological importance of body acceleration many theoretical investigations have been carried out for the flow of blood under the influence of body acceleration. In this study, the mechanical loads that pilots experience during flight are considered. The aim of the present study is to investigate the effects of mechanical... 

It is undeniable that there is a great disagreement in the every field of religion. Reductionists argue that awareness of disagreements reduces the justification and rationality of beliefs, including religious beliefs. In contrast, non-reductionists believe that while reductionism may be true in other domains, it is not necessarily true in religion, because religious beliefs have characteristics that can deny a reductionist argument. They are in the realm of religion. In this thesis, I will discuss issues related to those characteristics that can deny reductionist argument in the realm of religion. In this thesis, I try to show that the arguments and responses presented in defense of the... 

In the current century, an energy storage is one of the critical and important factors affecting on human life. Rechargeable batteries, specially Lithium ion batteries (LIBs), can be considered as ideal energy storage devices including various advantages e.g. high energy and power densities. In this work, Tin IV sulfide (SnS2) and its composites, making by conductive materials e.g. Reduced Graphene Oxide (SnS2@rGO), are prepared during two different synthesis methods consisting of Hydrothermal and Hot-bath, and their properties are investigated as anode material in LIB. The structural and electrochemical analyses demonstrated that the composite sample prepared by hot-bath method exhibited... 

Due to the data centers rapid growth and introduction of a new basic type of massive data processing platforms which requires accelerators to speedup computation and enhance the efficiency and reduce power consumption, using accelerators is inevitable. Communication and data transfer time between software and hardware is the most of time spent on the use of accelerators. By optimizing this part of the hardware / software platform, we have achieved substantial results in this area. The aim of our study is to organize a survey of real accelerator characteristics. To figure out its defects and main drawbacks, in addition to improving the overall efficiency of system. The implementation of...