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Cross-Project Software Defect Prediction with Deep Learning
, M.Sc. Thesis Sharif University of Technology ; Fazli, Mohammad Amin (Supervisor)
Abstract
Software defect prediction is a significant and growing field in software development that focuses on identifying software modules prone to defects before the testing phase. The challenge of lacking historical data has shifted software defect prediction towards a cross-project approach. In this method, identifying defective software modules in a project (target project) is done using historical data collected from other projects (source project). The difference in data distribution between source and target projects is a major challenge in cross-project defect prediction. One way to overcome this challenge is the appropriate selection of the source project, which most existing studies...
Increasing the Accuracy of Vectorial Gaussian Beam Tracing in a Short Urban Link Using Hybrid Methods
, M.Sc. Thesis Sharif University of Technology ; Shishegar, Amir Ahmad (Supervisor)
Abstract
Recently, there has been a great interest toward site–specific modeling of outdoor radio wave propagation. Wave propagation in very large environments compared to a wavelength builds up an important category of electromagnetic wave propagation problems which occurs in
versatile criteria from optical devices to long wireless microwave links. Well-known methods such as different ray tracing schemes used in these problems suffer from long execution time and great amount of needed memory. A new method has been proposed in this thesis to overcome such difficulties for high frequency wave propagation in large scale problems. The proposed method is based on tracing 3D vectorial Gaussian beam....
versatile criteria from optical devices to long wireless microwave links. Well-known methods such as different ray tracing schemes used in these problems suffer from long execution time and great amount of needed memory. A new method has been proposed in this thesis to overcome such difficulties for high frequency wave propagation in large scale problems. The proposed method is based on tracing 3D vectorial Gaussian beam....
Vectorial Gaussian beam tracing method for millimeter wave propagation modelling in a large scale media
, Article 2009 Mediterrannean Microwave Symposium, 15 November 2009 through 17 November 2009 ; 2009 ; 9781424446643 (ISBN) ; Naqavi, A ; Shabani, M ; Shishegar, A. A ; Sharif University of Technology
2009
Abstract
We use the 3D vectorial Gaussian beam tracing method to model millimeter wave propagation. We simulate the propagation of Gaussian beams in a large scale environment at 62.4 GHz. First, a known far field pattern of the transmitter antenna is expanded into a set of Gaussian beams. We chose Gabor expansion based method to expanding radiating field into Gaussian beams. Then, a Gaussian beam tracing model considering reflections and transmission is used to represent urban microcell propagation. We use a phase matching method to find reflected Gaussian beam The results of the Gaussian beam tracing simulations including line-of-sight (LOS) and non-Iine-of-sight (NLOS) propagation are compared with...
The design of a low-power high-speed current comparator in 0.35-μm CMOS technology
, Article Proceedings of the 10th International Symposium on Quality Electronic Design, ISQED 2009, 16 March 2009 through 18 March 2009, San Jose, CA ; 2009 , Pages 107-111 ; 9781424429530 (ISBN) ; Alavi Rad, H ; Alavi Rad, M ; Mortazavi, M ; International Society for Quality Electronic Design, ISQED ; Sharif University of Technology
2009
Abstract
A novel low power with high performance low current comparator is proposed in this paper which comprises of low input impedance using a simple biasing method. It aimed for low power consumption and high speed designs compared with other high speed designs. The simulation results from HSPICE demonstrate the propagation delay is about 0.7 ns and the average power consumption is 130 μW for 100 nA input current at supply voltage of 1.8 V using 0.35 micron CMOS technology. © 2009 IEEE
The Relationship between Leadership Styles and Organizational Citizenship Behaviors in a Knowledge-Based Organization
, M.Sc. Thesis Sharif University of Technology ; Alavi, Babak (Supervisor)
Abstract
In this thesis, the relationships between various leadership styles and organizational citizenship behaviors (OCBs) were examined. For this, with a qualitative perspective and using the Grounded Method as the research methodology, dominant OCBs, effective leadership styles, the relationships between leadership behaviors and OCBs, and other influencing parameters were identified. In this regard, with a preliminary feasibility study, the possibility of implementing this research was verified and then, by using twelve in-depth interviews, required information was gathered. Main categories were recognized by coding the data and analyzing the relationship between the coded information. The...
The Relationship between Employees’ Trust in Their Managers and Performance Management Effectiveness
, M.Sc. Thesis Sharif University of Technology ; Alavi, Babak (Supervisor)
Abstract
Several studies in the field of performance management have paid attention to the effect of systemic and instrumental factors on the effectiveness of performance management system. However, the impact of communication and relational factors has received less attention. Furthermore, it seems that similar approach has been used in organizations for considering systemic factors in designing performance management systems rather than human factors. The goal of this research was to study the relationship between employees' trust in their manager as an relational variable with the effectiveness of performance management system and to compare this relationship with the relationship between the...
Numerical Modeling of Cohesive Cracks in Functionally Graded Materials Using XFEM
, M.Sc. Thesis Sharif University of Technology ; Kazemi, Mohammad Taghi (Supervisor)
Abstract
Nowadays in high-tech industries there is a serious demand for using advanced materials. Functionally graded materials (FGMs) are in the last generations of these group of materials. FGMs have shown good behavior in special conditions. According to sensitive applications of FGMs , there is a large amount of effort to understand it’s behavior in the presence of crack. Finite element method and other numerical methods, in recent years are widely used in modeling fracture problems.Remeshing requirements and mesh sensitivity are among the disadvantages of analyzing crack growth using the conventional FEM. Recent finite element methods such as extended finite element method, are proposed to model...
Optimal Bundle Pricing and Ordering jointly in Industrial Tourism
, M.Sc. Thesis Sharif University of Technology ; Modarres, Mohammad (Supervisor)
Abstract
This study presents an efficient decision making model for tourism services managers. Decisions of bundle pricing and ordering for a perishable multi-product jointly are considered in a multiple period horizon to maximize the expected profit of the firms. The retailer uses bundling strategy for products pricing to give customers discount when buying a bundle of products. The discretionary sales is incorporated which authorizes managers to save inventory for satisfying future demand even if some present demand is lost.
For solving the problem in deterministic case, we apply modified-genetic algorithm and in stochastic case, sequential quadratic programming (SQP), stochastic simulation and...
For solving the problem in deterministic case, we apply modified-genetic algorithm and in stochastic case, sequential quadratic programming (SQP), stochastic simulation and...
The Effect of Solvent Type on the Characteristic of TiO2 Nanometric Coatings Produced by Electrophoretic Method
, M.Sc. Thesis Sharif University of Technology ; Ghorbani, Mohammad (Supervisor)
Abstract
Titania is semiconductor material and have many applications including photocatalysis, photochromic, air and water purification, sensors, and solar cell. In electrophoretic deposition, charged particles dispersed in a stable suspension move towards an oppositely charged electrode, and form dense layer of deposit on it. In this investigation electrophoretic deposition of titania nano-particles in suspensions prepared by different solvents (methanol, ethanol and butanol) with and without dispersant (triethanolamine and polyethylenimine), was studied. Well stabilized suspensions, prepared for electrophoretic deposition. The effects of solvent type, additive concentration, mechanism of particles...
Evaluation of Productivity in Dam Construction
, M.Sc. Thesis Sharif University of Technology ; Mortaheb, Mohammad Mehdi (Supervisor)
Abstract
In today’s competitive world, productivity is one of the main components that guarantee the success and profitability of an industry or a project. This research has studied productivity of dam construction projects in Iran that are usually classified as mega projects. First, the major factors influencing productivity of dam construction projects in Iran were identified and evaluated. Three main sources of information namely; literature review, records and lesson learned from previous projects and experts’ opinions were used to identify these factors. Then, 41 main factors influencing productivity were selected and the effect of each factor was measured based on the results obtained from...
Steel Moment-Resisting Frames with Mixed Ductile Moment-Shear Fuse
, M.Sc. Thesis Sharif University of Technology ; Kazemi, Mohammad Taghi (Supervisor)
Abstract
This thesis presents the seismic performance evaluation of steel MRFs with nonlinear replaceable links. Although existing MRFs can provide life safety during a design level earthquake, they are expected to sustain significant damage at the locations of flexural yielding fuses in the beams .These drawbacks can be mitigated by introducing replaceable links at the locations of expected inelastic action. Codes require that the span-to-depth ratio of the beams in moment resisting frames (MRF) should be limited to guarantee the development of plastic hinges with a sufficient length at beam ends. To overcome the abovementioned limits, in this paper a new replaceable shear structural fuse is...
Spacecraft Control for Capturing Space Debris via Machine Learning Methods
, M.Sc. Thesis Sharif University of Technology ; Kiani, Maryam (Supervisor)
Abstract
The primary purpose of the present research is development and implementation of advanced state estimation and control techniques for space rendezvous and docking. To achieve this aim, the present study has first investigated the use of graph neural networks (GNNs) to filter out the noise of the sensor data in the state estimation process. The measurement package is consisted of a gyroscope, star trackers, and a GPS sensor providing inputs to the GNNs. The obtained results showed that the use of GNNs significantly improves the accuracy of the state estimation compared to traditional methods. In addition, the study has focused on developing advanced control techniques for spacecraft position...
Overlay routing Architectures for Massively Multiuser Virtual Environments
, Ph.D. Dissertation Sharif University of Technology ; Alavi, Mohammad Hossein (Supervisor) ; Pakravan, Mohammad Reza (Supervisor)
Abstract
Multi-participant virtual environments are network applications that simulate the experience of real-time interaction among multiple usersdistributed all over the internet In order to share the common sense of time and place, multiple entities interacting in the shared virtual environment should become aware of the modification to the shared environment, or the result of on the other objects interactions shortly after such events occur. This is achieved through the distribution of update messages. As the number of users and entities increases, there is a considerable increase in the amount of update messages exchanged among the users and entities. This is considered as one of the most...
Exploitation of Construction Modeling (BIM)and Virtual Reality (VR)in Dam Infrastructure Monitoring and Maintenance
, M.Sc. Thesis Sharif University of Technology ; Alvanchi, Amin (Supervisor)
Abstract
Dams are one of the vital infrastructures of the country and their correct use can have a significant impact on reducing costs and increasing their productivity. Due to the fact that dams are mainly large structures with a large number of components and with many complications of operation and maintenance, their operation and maintenance require spending a lot of money. On the other hand, the depth and volume of water behind the dams and the entanglement of the connection between the dams and the surrounding environment make the operation and maintenance of dams face many risks. The use of new technologies that can reduce the costs and risks of operating and maintaining dams can greatly help...
Identifying the Dimensions of Change Readiness of Senior Managers for a Strategic Change: A Case Study of the Implementation of a Strategic Budgeting Plan in Sharif University of Technology
, M.Sc. Thesis Sharif University of Technology ; Alavi, Babak (Supervisor) ; Arasti, Mohammad Reza (Supervisor)
Abstract
The purpose of this study was to identify the dimensions of readiness for change in senior managers in the academic environment. In the literature, the emotional component of readiness for change requires more empirical research. The main question of this research is to identify cognitive and affective dimensions of readiness for change. This research has an exploratory approach, and a qualitative research method has been used to reach the research goals. In order to answer the questions of this research, a case study of Strategic Budgeting Implementation Plan at Sharif University of Technology has been studied. Interviews were conducted with the heads of the depatments of Sharif University...
Critical Barriers to Successful Strategy Implementation: A Case Study of a Software Producing Firm
,
M.Sc. Thesis
Sharif University of Technology
;
Arati, Mohammad Reza
(Supervisor)
;
Alavi, Babak
(Supervisor)
Abstract
This thesis seeks to identify the critical barriers to strategy implementation in an Iranian firm, and also concentrates on the readiness for strategy implementation phase. Previous studies show that many of strategic plans fail in implementation phase. Therefore, implementation and readiness for implementation phases are both important phases. The very few studies in this topic in Iranian industrial context illustrate the same issue in local context; however, these barriers may vary from one context to another. Different approaches and frameworks in the literature have been reviewed in order to build a theoretical frame work to seek the barriers to implementing a strategic plan in an...
Examining Factors Influencing Top Managers' Decisions about Conducting Strategic Planning: a Case Study in Two Iranian Companies
, M.Sc. Thesis Sharif University of Technology ; Alavi, Babak (Supervisor) ; Arasti, Mohammad Reza (Co-Advisor)
Abstract
Despite the profound impact of formal strategic planning on the performance of companies, there have been a few researches on the factors that influence the starting phase of strategic planning process. This research tries to identify these factors and clarify the decision process of conducting strategic planning. In other words, the main purpose of this study is to identify the rationales of companies for initiation of strategic planning. Regarding limited previous studies on this topic, especially about the decision process about conducting strategic planning in Iranian companies, the case study methodology is used. The study is conducted in two phases. In the first phase, five companies...
Subsidiaries' Chairperson's Roles in Boards' Control and Service Functions
, Ph.D. Dissertation Sharif University of Technology ; Alavi, Babak (Supervisor) ; Arasti, Mohammad Reza (Co-Supervisor)
Abstract
Understanding the behavioral processes of boards has been a new line of inquiry in the board literature. This study has focused on the leadership roles of heads of boards of subsidiary companies in a corporation. This subject is widely practical in most industries but rarely explored. An embedded multiple case study design was used to compare the leadership roles of heads of boards of two groups of boards with high and low effectiveness in a corporation assessed by a multi-source appraisal method. Based on several interviews with different stakeholders of the corporation within subsidiary boards of these two groups and the staff managers of the parent company, we compared the mechanisms that...
Relationship Between Feedback-Seeking Motives and Dimensions and Individual Performance in an Iranian Knowledge-Based Organization
, Ph.D. Dissertation Sharif University of Technology ; Alavi, Babak (Supervisor) ; Miremadi, Iman (Supervisor)
Abstract
The present study investigates the relationships between feedback-seeking dimensions (frequency, method, timing, and content) and two types of individual performance (goal achievement and behavior-related performance). In addition, the relationships between feedback-seeking motives and feedback-seeking dimensions are examined. The purpose is to identify new explanations for the inconclusive results of the direct relationship between feedback-seeking and performance in the literature. Moreover, this study investigates work motivations based on self-determination theory as the antecedents of feedback-seeking motives. This study contains one qualitative phase and two quantitative ones....
Phase-induced intensity noise in digital incoherent all-optical tapped-delay line systems [electronic resource]
, Article Lightwave Technology, Journal of ; 2006, Volume.24 , Issue. 8, p.3059-3072 ; Salehi, J. A ; Sharif University of Technology
Abstract
In this paper, the authors analyze conditions under which they can be certain on the intensity addition of a given device, such as tapped-delay lines, used in digital incoherent all-optical communication systems. A general expression for phase-induced intensity noise that is applicable to all types of semiconductor lasers is derived by defining an optical self-SNR expression that can be used to analyze and measure phase-induced intensity noise. The result shows that in order to have a minimal phase-induced intensity noise in most digital optical incoherent systems, a large optical self-SNR, e.g., 20 dB or more, is needed. This in turn is shown to place a limit on the maximum rate of...