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Botnet C&C Channel Detection Based on DNS Traffic Analysis

, M.Sc. Thesis Sharif University of Technology Soltanaghaei, Elaheh (Author) ; Kharrazi, Mehdi (Supervisor)

Abstract

A study of the recent trends in cyber-attacks reveals that the large families of controllable compromised computers known as botnets are the prominent sources of threats in the internet. Sending stolen information and receiving commands are the principal activities of bots through C&C channels. Thus maximizing availability of these vital mediums is one of their necessities. In order to achieve this aim, new evasion techniques such as fast-flux has evolved botnets in which a domain name with multiple resolved IPs is used rather than assigning a fix IP to the C&C servers. Although a numerous approaches have been proposed for detecting fast-flux networks, needing a large amount of labeled data...

Complexity of Density Dependencies of Thermal- and Internal- Pressure Compared to that of Total Pressure

, M.Sc. Thesis Sharif University of Technology Sajjadi, Hashem (Author) ; Parsafar, Gholamabbas (Supervisor) ; Goharshadi, Elaheh (Supervisor)

Abstract

A simple equation of state (EoS) has recently been introduced (J. Phys. Chem. B 2009, 113, 11977–11987) as (Z-1) v^2=e+f⁄ρ+gρ^2, where Z≡pv⁄RT is the compressibility factor, v=1⁄ρ is molar volume, and e, f, and g are temperature dependent parameters. This EoS has been found to be accurate for all types of nano- and bulk- solids and bulk fluids, in the entire temperature and pressure ranges for which experimental data are reported, except for the isotherms within the critical region.
The aim of this work is to investigate the validity of a 3-term expression similar to the mentioned EoS for both thermal and internal contributions to the compressibility factor, separately. Such...

Pattern extraction for high-risk accidents in the construction industry: a data-mining approach

, Article International Journal of Injury Control and Safety Promotion ; Volume 23, Issue 3 , 2016 , Pages 264-276 ; 17457300 (ISSN) Amiri, M ; Ardeshir, A ; Fazel Zarandi, M. H ; Soltanaghaei, E ; Sharif University of Technology

Taylor and Francis Ltd 2016

Abstract

Accidents involving falls and falling objects (group I) are highly frequent accidents in the construction industry. While being hit by a vehicle, electric shock, collapse in the excavation and fire or explosion accidents (group II) are much less frequent, they make up a considerable proportion of severe accidents. In this study, multiple-correspondence analysis, decision tree, ensembles of decision tree and association rules methods are employed to analyse a database of construction accidents throughout Iran between 2007 and 2011. The findings indicate that in group I, there is a significant correspondence among these variables: time of accident, place of accident, body part affected, final...

Pulsating Pulmonary Blood Inflow in Total Cavopulmonary Connection (TCPC) after Fontan Surgery

, M.Sc. Thesis Sharif University of Technology Moradi, Hamed (Author) ; Sayadi, Hassan (Supervisor) ; Firoozabadi, Bahar (Supervisor) ; Navabi Shirazi, Mohammad Ali (Co-Supervisor) ; Malakan Rad, Elaheh (Co-Supervisor)

Abstract

Patients with a single ventricle disease who have undergone Fontan surgery have always had long-term complications. These complications include pulmonary artery stiffness and decreased ability to exercise. In fact, due to removal of the right ventricle from the circulatory system, blood pressure and pulsatility inflow to total cavopulmonary connection (TCPC) are reduced following this surgery. Creating waves (radial displacement) on the IVC (Inferior Vena Cava) wall can increase pulmonary flow pulsations. The Objective of this study is to test the effect of induced wave amplitude on the pulmonary flow pulsations at the rest condition. Computational fluid dynamic (CFD) simulations were...