Electrochemical Study on Multidentate Amino Acid Ligands and Their Co(II) and Fe(III) Complexation

, M.Sc. Thesis Sharif University of Technology Nemati Bideh, Babak (Author) ; Ghanbari, Bahram (Supervisor)

Abstract

In our previous work, we have been undertake complexion of new amino phenolic ligand with Fe(III) and Co(II) in order to synthesis LSCF - and LSF - type perovskite inorganic membranes. In this study, the interactions between Co(II) and Fe(III) cations and the mentioned ligands were investigated their by cyclic voltammetry technique. In aqueous solution, it was found that chelate ring size has more prominent effect on the ligand-metal interaction than the related amino acid substitution. Accordingly, the amino phenol substituted...

Voltammetric monitoring of Cd (II) by nano-TiO2 modified carbon paste electrode sensitized using 1,2-bis-[o-aminophenyl thio] ethane as a new ion receptor

, Article Sensors and Actuators, B: Chemical ; Vol. 192 , 2014 , pp. 648-657 ; ISSN: 09254005 Ramezani, S ; Ghobadi, M ; Bideh, B. N ; Sharif University of Technology

2014

Abstract

The objective of the work ahead is presentation of a new carbon paste electrode (CPE) modified by TiO2 nanoparticles (TiO2NPs) and 1,2-bis-[o-aminophenyl thio] ethane (APTE) ligand as a selective cation receptor for determination of the Cd (II) ions using differential pulse anodic stripping voltammetry (DPASV). The electrode shows an excellent tendency to Cd (II) ions in presence of some interfering species. Under the optimum conditions, a linear calibration curve was obtained in the concentration range of 2.9 nM to 4.6 μM with a correlation coefficient of 0.9969 in the anodic potential of 0.54 (V vs. Ag/AgCl). The metal detection limit was 2.0 nM after 10 min preconcentration (S/N = 3). The...

Synthesis of One-Dimensional Nanoneedle-Like Arrays Hydroxyapatite for Bone Tissue Engineering Applications

, M.Sc. Thesis Sharif University of Technology Hassanzadeh Chinijani, Turan (Author) ; Nemati, Ali (Supervisor) ; Khachatourian, Adrine Malek (Supervisor) ; Shokri, Babak (Co-Supervisor)

Abstract

Implant primary stability is a crucial component of implant survival. Primary mechanical stability is correlated with implant type, surgical technique, quantity and quality of bone at the recipient site. Since bone integration (BI) significance has been acknowledged, a variety of techniques have been developed to quicken BI and achieve faster fixation. Studies have shown that material type, and many surface properties, including as surface composition, roughness, topography, and energy, have a significant influence during the early stages of bone integration to the implant. In this work, we did synthesis one-dimensional nanoneedle-like arrays of hydroxyapatite using the injection method...

Joint Inference of Diffusion and Structure in Partially Observed Social Networks Using Coupled Matrix Factorization

, Article ACM Transactions on Knowledge Discovery from Data ; Volume 17, Issue 9 , 2023 ; 15564681 (ISSN) Ramezani, M ; Ahadinia, A ; Ziaei Bideh, A ; Rabiee, H. R ; Sharif University of Technology

Association for Computing Machinery 2023

Abstract

Access to complete data in large-scale networks is often infeasible. Therefore, the problem of missing data is a crucial and unavoidable issue in the analysis and modeling of real-world social networks. However, most of the research on different aspects of social networks does not consider this limitation. One effective way to solve this problem is to recover the missing data as a pre-processing step. In this paper, a model is learned from partially observed data to infer unobserved diffusion and structure networks. To jointly discover omitted diffusion activities and hidden network structures, we develop a probabilistic generative model called "DiffStru."The interrelations among links of...

Machine learning interpretability meets TLS fingerprinting

, Article Soft Computing ; Volume 27, Issue 11 , 2023 , Pages 7191-7208 ; 14327643 (ISSN) Jafari Siavoshani, M ; Khajehpour, A ; Bideh, A. Z ; Gatmiri, A ; Taheri, A ; Sharif University of Technology

Springer Science and Business Media Deutschland GmbH 2023

Abstract

Protecting users’ privacy over the Internet is of great importance; however, it becomes harder and harder to maintain due to the increasing complexity of network protocols and components. Therefore, investigating and understanding how data are leaked from the information transmission platforms and protocols can lead us to a more secure environment. In this paper, we propose a framework to systematically find the most vulnerable information fields in a network protocol. To this end, focusing on the transport layer security (TLS) protocol, we perform different machine-learning-based fingerprinting attacks on the collected data from more than 70 domains (websites) to understand how and where...

Self-Leadership Strategies in Teamwork and Share Leadership Orientation with the Mediating Effect of Self-Efficacy

, M.Sc. Thesis Sharif University of Technology karbasforushan, Elias (Author) ; Alavi, Babak (Supervisor)

Abstract

The main purpose of this study is to evaluate the linkage between two constructs about teamwork activities. One of them is "self-leadership in teamwork", the extent to which a person could control and manage his thoughts and activities in teamwork. The other is "shared leadership orientation", which is about orientation of people to contribute in leadership processes. This linkage evaluated with consideration of "self-efficacy in shared leadership" as a moderator.
Questionnaires of self-leadership in teamwork and self-efficacy in shared leadership elicited from literature with a little change and shared leadership questionnaire developed in another study by the author.Questionnaires...

The Hidden Side of Coin: What Self Leadership Strategies Are Applied by Successful Iranian Women Entrepreneurs?

, M.Sc. Thesis Sharif University of Technology Mirhosseini, Minoo (Author) ; Alavi, Babak (Supervisor)

Abstract

Women are going to play more important roles in the economy of most countries including Iran. Hence, since the number of entrepreneurs among women is increasing, identifying characteristics and other factors that cause these group to be successful, is a critical issue. Studies show that entrepreneurs, especially women entrepreneurs, face numerous problems in their career. These problems are especially more demanding in societies with unique cultural attributes. Therefore, applying personal and managerial solutions in order to overcome these problems are necessary. On the other hand, researchers believe that one of the most effective and beneficial concepts helping entrepreneurs in their...

Identifying the Ethical Dilemmas Confronting Human Resource Managers of Iranian Project Based Companies and Exploring their Causes

, M.Sc. Thesis Sharif University of Technology Shokatian, Taha (Author) ; Alavi, Babak (Supervisor)

Abstract

The present study was performed aiming to identify the ethical dilemmas human resource managers confront with in Iranian project-based organizations as well as to trace out the underlying causes. “Ethical dilemma” refers to a decision making situation in which ethical considerations render all the alternatives inapt, thence making the decision making process ethically complex. First of all, a theoretical framework was developed based on the preceding research; then, the study was further conducted utilizing a qualitative research method with an exploratory approach. The data were collected using in-depth interviews and analysed using the theme analysis method. The corresponding interviewees...

Multiple Case Study of Distributed Leadership Effectiveness in Educational Major FoundingTeams of Sharif University of Technology

, M.Sc. Thesis Sharif University of Technology Samimi, Mehdi (Author) ; Alavi, Babak (Supervisor)

Abstract

Using Distributed leadership framework while studying the leadership phenomena in teams, especially in educational environment, has received more attention by scholars in these years. Although the results of these researches indicated positive consequences mostly, the need for exploratory studies to identify situational and contextual factors in distributed leadership effectiveness has been mentioned. In other words, it has been suggested that the effectiveness of distributed leadership in teams may be affected by situational and contextual factors. In the current multiple case study, after the initial study of leadership and its functions in some schools of Sharif University of Technology,...

Identification of Influence Mechanisms of Executive/non-executive Board Composition on Board’s Attribution Style

, M.Sc. Thesis Sharif University of Technology Helaly, Hamed (Author) ; Alavi, Babak (Supervisor)

Abstract

The influence mechanisms of executive/non-executive board compostion on board’s attribution style have been explored. In two case studies, I have examined boards’ causal interpretation about a critical incident which had a significant impact on firm performance. A qualitative research approach has been taken in the case studies. Data was gathered through semi-structured interviews with all board members and was analyzied with the theme analysis method. According to the results, board of directors’ collective attribution formation process can be devided into three stages of members’ expression of information and facts at board meetings, forming the individual judgements of members and at...

A Study on Relationships between Career Anchors and Career Orientations

, M.Sc. Thesis Sharif University of Technology Shahrzad, Zarvan (Author) ; Alavi, Babak (Supervisor)

Abstract

Career Orientations or career choices, can be affected by internal and external factors. External factors are the environmental conditions that the reward and the attractiveness of selecting a career choice are dependent to them. Internal factors include the needs of oneself from his/her job, his/her beliefs and his/her skills and competencies about the job. In this research the internal antecedents of managerial and technical orientations between programmers have been identified. On the other hand the perception of people about the compensation system as an external factor which can affect the mentioned relationships, have been analyzed. It seems that this is the first research which career...

The Evaluation of Application of Unfolding Model of Turnover to Explain the Turnover of Knowledge Workers in Some Iranian Software Companies

, M.Sc. Thesis Sharif University of Technology Rahdari, Hossein (Author) ; Alavi, Babak (Supervisor)

Abstract

Voluntary turnover has direct and indirect expenses for organizations and for this purpose; it has one of the richest literatures in academic works. Due to the especial role of knowledge workers in organizations, these expenses in knowledge-based organizations are more important and more costly than that of other organizations. One of the latest theories in the field of voluntarily turnover was introduced by Lee and Mitchell (1994) that was named “Unfolding Model of Turnover” to describe the process of decision of voluntary turnover. This theory is distinguished from its similar theories from two main aspects: First, they introduced new elements like shock. Second, they introduced...

, M.Sc. Thesis Sharif University of Technology Bagheri, Nasrin (Author) ; Alavi, Babak (Supervisor)

Abstract

The measure of success in a company is determined by a high performing workforce that demonstrates the competencies necessary to drive the business success, while meeting the organization's strategic goals. This is where competency-based human resource management becomes important. The main factor contributing to the above noted area is the identification of core competencies. There has been a lot of research in this area during the past few years. Each research demonstrates an approach for the development of critical human resource competency models in an organization. In order to determine the foregoing competency model, the early studies in this area have been focused on the distinction...

Investigating the Components Affecting the Perception Of the Authenticity of Senior Managers of Knowledge-Based Companies in the Instagram Social Network and Its Role in Shaping the Organization's Employer Brand from the Perspective of Potential Knowledge Employees

, M.Sc. Thesis Sharif University of Technology Bayat, Erfan (Author) ; Alavi, Babak (Supervisor)

Abstract

The goal of this study was to realize how the younger generation's perceptions of the authenticity of senior managers in knowledge-based firms affects the components of their employer brand on social media. For this reason, the perceptions of managers' authenticity from the perspective of the younger generation on Instagram, as an example of social networks, was investigated in the first stage of the study. The mechanisms of effectiveness of the identified components of authenticity are sought in the second step, in shaping the components of the manager's organization's employer brand. To attain the research goal, an exploratory approach was taken conducted, and a qualitative research method...

Possible Impacts of Telework Initiated by COVID-19 Outbreak on Teleworkers’ Psychological Well-being: A Qualitative Study

, M.Sc. Thesis Sharif University of Technology Saki, Mana (Author) ; Alavi, Babak (Supervisor)

Abstract

This research explores the impacts of the telework initiated by the outbreak of COVID-19, which is being called “emergent telework” in this research, on psychological well-being of teleworkers. As for the nature of emergent telework which is a new and unique phenomenon, a qualitative research is conducted. In order to do so, 15 in-depth interviews were held with employees from product teams of 11 organizations, and the interviews were analyzed using thematic analysis. General conditions of teleworking are identified in two categories named as “not working adjacent to coworkers” and “being away from the physical environment of the workplace”. Emergent telework, alongside the general...

An Empirical Study of the Relationship between Emergent States and Behavioral Processes of the Board

, M.Sc. Thesis Sharif University of Technology Bahmani, Mehran (Author) ; Alavi, Babak (Supervisor)

Abstract

In this research study, the reciprocal relationship between Emergent States and Team Processes has been analyzed in boards of directors, by using case study method with semi-structured interview as the method of data collection and thematic analysis as the method of data analysis. This research was conducted on the companies which are active in Information Technology industries, their size is in the range of SMEs, and have passed the early startup stage and an external investor has joined the board. After thematic analysis, narrating each case’s story, and theoretical analysis on each case, the obtained results are demonstrated with discussion on both cases, introducing a theoretical model,...

Using Probabilistic Models and Data Mining Techniques in Online Computer Games

, M.Sc. Thesis Sharif University of Technology Khosravinia, Sina (Author) ; Haji, Babak (Supervisor)

Abstract

Computer video games have had a huge growth in recent years, and Dota 2 is one of the most popular video games and e-sports right now. In this research, Dota 2 drafting phase is studied by using stochastic processes and probabilistic models. This phase is modeled as a POMDP (Partially Observable Markov Decision Process) for the first time. Afterwards, the model is solved using data mining methods and machine learning algorithms. A large database of the game's match data is created, and six different machine learning algorithms are used to predict the match outcome based on the drafting stage. The prediction accuracy and power of these algorithms is compared, and finally, a program is...

Investigating the Application of Authentic Leadership on Creating Autonomous Motivation and Affective Commitment For Employees in Organizational Complex Change

, M.Sc. Thesis Sharif University of Technology Zakiani, Zahra (Author) ; Alavi, Babak (Supervisor)

Abstract

The purpose of the present study is to facilitate the implementation of "organizational complex change" that is important in today's organizational competitive environment. To this end, and to increase employees' commitment to change, the study utilized the role of "authentic leadership" and "self-determination theory." In this study, using data from 269 employees involved in an organizational complex change, relationships between variables were tested to finally see how authentic leadership for change can enhance employees' "affective commitment" to change. For this purpose, exploratory factor analysis and multiple regression were conducted on the data and 3 out of 5 hypotheses were...

A Study of Identification of Self-leadership Mechanisms in Participants’ Motivations Attending an Employment Interview Educational Module based on the Role Playing Method

, M.Sc. Thesis Sharif University of Technology Ahmadi, Mohammad (Author) ; Alavi, Babak (Supervisor)

Abstract

The present study aimed to investigate the application of self-leadership strategy by participants in a training course of employment interview through the role playing method to face the relevant challenges. Solving or regulation of the challenges in a training course can result in participants’ learning improvement. This course was taken place as a part of the Human Resource Management Course in 2017 in the graduate school of management and economics at Sharif University of Technology. Initially, background and models were reviewed, and then the research theoretical framework was developed accordingly. In addition, since the subject was rather new, a qualitative research method by...

Optimal Assignment of Patients from Emergency Department to Inpatient Hospital Wards

, M.Sc. Thesis Sharif University of Technology Shakeri, Mahdi (Author) ; Haji, Babak (Supervisor)

Abstract

Emergency Department (ED) overcrowding is one the most problems and challenges that every Emergency Department all over the world is facing with. This problem leads to some problems like prolonged waiting times and Length of Stay in Emergency Department. “Boarding time” is one of the most important ones, which is the time a patient spend for being transferred from Emergency Department to one of the Hospital Inpatient Wards. One important solution to this problem is “overflowing”, and it means allocating patients to an alternative ward rather than their primary ward. In practice, the overflowing process usually controlled in a myopic manner. Limited number of researches that focus in this...