Sharif Digital Repository

Some firms grow very rapidly, the others much more slowly. In this research we compare the founding strategies of 32 Iranian software industry new ventures that have grown very rapidly with those with much less growth. This study aims to compare these two groups of firms, in order to provide insights into the attributes of rapid-growth software firms founding strategies. Founding strategies, in this research, refers both to the characteristics of the entrepreneurs who establish the firm, and to the decisions regarding initial markets and products. Results indicate that high-growth firms used to have more experienced entrepreneurs (managerial, industry specific, and work experience). In... 

With new technologies, processor power density is dramatically increased which results in high temperature. Temperature has significant impact on reliability, performance, power consumption and cooling costs. This alarming trend underscores the importance of temperature management methods in system design. Recently, various research efforts have been focused on addressing thermal issues. Due to mobility, cost and size constraints and reliability requirements, the embedded systems do not warrant use of modern cooling mechanisms such as heat sink and fan. This caused the thermal issues to be more prominent in embedded domain. This study aims at introducing thermal management techniques for... 

Corporate entrepreneurship has been shown to have a positive effect on the long-term growth of family firms. Therefore, identifying the factors affecting the promotion of corporate entrepreneurship in successive generations of a family firm could be critical. Out of a variety of factors the focus of this research is on indenfying the successor's competencies, the methods of developing the competencies in the successor, and the predecessor's competencies for developing the successor. In this regard, five Iranian family firm which have been entrepreneurial in different generations have been studied. The results show 17 competencies are needed for the successor to develop corporate... 

Since the classical continuum theory fails to deal with the problems associated with defects, stress concentrators, and relevant deformation phenomena in solids, alternative approaches that can detect the atomistic nature of materials' fracture are required. The deficiency of the capture the size effect which yields delusively high values for some components of the stress field right on the edge of the stress concentrators, and its weakness in describing the complex interaction between small inhomogeneities, cracks and the like when they are only a few nanometers apart, are among some of the disadvantages of the classical approach. In recent years, however, atomistic methods are emerging to... 

Aluminum Bronzes have many applications in marine environments. These alloys suffer from both hot cracking and cold cracking. In order to overcome the hot cracking and cold cracking, Semisolid Stir Joining method and a proper thermal cycle was used respectively. Effects of temperature, stirring rate, and tool type were investigated in Semisolid Stir joining method. In this method, butt joint design was used in order to place specimens, and the specimens were heated up to specific temperatures (920, 925, 930°C). A stirrer (Cylindrical and Grooved tool) with three rotational speeds (800, 1200, 1600 RPM) was introduced into the stir weld seam. Welded specimens were cooled to the 900°C... 

The low female labor force participation rate in the Iranian labor market relative to the global average and even to countries that do not differ significantly from the socio-economic characteristics of our country is one of the important questions of the Iranian labor market. In this study, we seek to answer the question of whether the economic participation rate of married women will increase if the gender gaps in wages, job findings and job losses among women and men are eliminated in the Iranian labor market. To answer this question using household expenditure and income data and labor force data, we show that between the two categories of occupations, in terms of the share of women's... 

Shot peening is a cold-working process commonly used in industry to improve the fatigue performance, stress corrosion resistance and surface nano-crystallization of metallic parts. This process extends fatigue life via two mechanisms: Preventing the crack growth due to compressive residual stresses and, preventing the crack initiation because of increased material hardness. These mechanisms are the results of the bombardment of the component's surface with small spherical particles. In this research, an analytical model is developed for estimating the residual stress distribution induced by shot peening process. The modifications of the developed analytical model are related to... 

Solid-State Drives (SSDs) provide high performance, low power consumption, and hence are widely used in the I/O cache of enterprise storage systems and high performance servers. Although employing high performance SSDs in the I/O cache of storage systems significantly improves system performance, it comes with significant reliability threats for write operations upon power failures. In order to provide high level of reliability, storage architectures employ SSDs in I/O cache with RAID-1 configuration, however, such configuration only partially mitigates the reliability issues of the SSDs. In this thesis, we analyze the reliability of SSD-based I/O caches against power outage and high... 

An optimal trajectory for flight through Microburst wind shears is designed which minimizes the maximum deviation from desired trajectory With respect to optimal control methods. The suitable performance of airplane retrieval in abort landing and landing phases at microburst encounter is achieved by influence of mentioned design in worse case of wind fluctuation and variation. 3D Vicroy microburst model is selected to investigate its effects on 6 DOF jet engine aircraft EOMs. Above optimal control problem is solved using gradient method of SD . Furthermore, sensitivity of optimal trajectory to lateral and longitudinal location of microburst, microburst parameters, throttle setting and...