Sharif Digital Repository

There are always some unpredictable phenomena happen in the process of constructing of a downstream petrochemichal plant resulting to delays that increase the cost compared with the benefits or sometimes cancelation of the projects that abodones the investors from the returns at all. On of the reasons that these issues can dwibdles the benefits is that most of Iranian’s downstream companies do not prepare suitable and sufficient capabilitities to cope with such a risks. In this thesis, at first, influensive risks on the downstream oil and gas projects in Iran have been studied based on a comprehensive litreture review, secondly using a questionnaire, these extracted risks have been assessed... 

Recently, the advent of online platforms as an intermediary tool has provided an opportunity for service providers and manufacturers to offer their services/products to consumers. Ride-hailing platforms are an example of these businesses where independent drivers and passengers are matched via an online platform. One of the most significant challenges faced by these companies is the emergence of strategic behaviors on both the demand and the supply side, which might affect the performance and profitability of the platform.In this thesis, we study the strategic behavior of drivers and its impact on their performance, using the data of one of the largest ride-hailing companies in Iran. We use... 

Over the past two decades, the interest in exploring consumers' behavior has risen to popularity. Nowadays, it is necessary for marketers to reach out to the right consumers at the right time and with the right message. Even though the positive impact of tracking consumers throughout their purchase journey and its managerial implications have been emphasized several times by academics, There is still a lack of practical research on how to discern the consumers' stage in the purchase journey from a holistic point of view. In this study, we develop several machine learning models, including RNNs (GRU and LSTM), Transformers, and XGBoost, by utilizing historical data of Yektanet (the leading... 

Residential satisfaction plays a pivotal role in shaping liveable cities, profoundly influencing individuals' health and well-being. In contrast, dissatisfaction in living environments often triggers relocation intentions, leading to significant vacancy costs for landlords and property managers. While previous studies predominantly relied on traditional methods like surveys and interviews, our research adopts a novel, bottom-up approach, analysing this phenomenon through the lens of residents themselves. Leveraging a custom-developed Python-based web scraper, we meticulously gathered 195,000 online reviews from apartments.com. This comprehensive dataset spans the most populous cities and... 

In recent years, Internet advertising has become increasingly customized to individual users. As advertising carry on refining its capacities, it is more likely to be seen as insightful and useful by everyone. Consumers, particularly Gen Y and older members of Gen Z, are becoming more accepting of relevant advertising as digital acquaintance. Consumers now welcome active advertising that responds and reflects social activity, location, and brand and product preferences in real-time. This ability to be agile within the consumer’s connected experience is an emerging revenue driver and will continue to grow as ad platforms and ad presentations become smarter. But more personalization results in... 

Nowadays, one of the most popular methods of advertising is online advertising, which is commonly used by many businesses. In the meantime, targeting the right person at the right moment to show an advertisement is always a major concern of advertisers and other players in this field. One of the areas of study in the literature in this field is the investigation of factors affecting the effectiveness of targeted advertising. The purpose of the upcoming research is to investigate the impact of the advertised product involvement in targeted online advertising. This level of effectiveness is measured by considering click intention as a measure of effectiveness and examining the impact of... 

With the easy access to internet and connected devices ubiquities, Today more than 50 million people use online education platforms to improve their skills and broaden their knowledge. In this research we tend to answer two questions based on data from Iranian students from top domestic universities.First question is which factors would these users consider in choosing their online education platform. This would be especially interesting to know in context of Iran’s cultural and job market situations.Second question we are interested in the same context is what are the factors that make users of these platforms to stop using them. This is very important since stoppage rate of online... 

From the beginning of current decade, ride souring in two sided platforms started its activities in Iran and after few years could reach to 10 billion Tomans turnover per year. Now a day Ride sourcing has more than 30 million users in Iran. These days there are more than 5 million price checks in ride sourcing mobile applications from passenger side but, only in half of them passengers and drivers get match. In this situation, one of the biggest challenges of ride sourcing companies is driver’s acceptance rate. Improving acceptance rate could make market bigger, increase utilization and driver satisfaction rate. According to explained need, this study with cooperating of the ride sourcing... 

Nowadays, the brain drain problem has become a challenge for countries of origin (COO) and a blessing for countries hosting student migrants. This issue has been studied in many domestic and international types of research. These studies' results can lead to the ability to identify the causes and discover methods to solve this problem. For several decades, the human capital flight has been one of the most challenging educational-economic-social problems in Iran and has grown significantly in recent years. The waste of the country's resources, the ineffectiveness of the education provided to students to improve the country's condition and its construction, the social and psychological... 

In this research, we will examine the emotions in the comments recorded about the tweets that have gone viral on the Twitter social media. We use Ekman's emotion classification model to classify emotions. Also, we choose the desired brands from the international brands of the fashion and clothing industry. These brands are divided into 2 luxury and non-luxury categories. Finally, we select 10 luxury brands and 9 non-luxury brands and extract all their tweets in a period of 6 months. Tweets that have been published more than a certain amount are considered as viral tweets, and using a machine learning model designed for this purpose, the emotions in the comments of users are analyzed and... 

Health influencers leveraged social networks to connect with people and society during the Covid-19 crisis. Platforms like Twitter served as suitable channels for disseminating published messages through word-of-mouth communication. In times of crises like Covid-19, individuals and organizations involved in managing the situation harnessed this capability, contingent upon the quantity and quality of word-of-mouth exchanges. During public crises, public polarity and sentiment toward the issue and the maintenance of public morale hold paramount significance. Consequently, crafting messages that garner positive word-of-mouth communication became a focal point for health influencers. In this... 

Every year, a high percentage of university graduates go abroad to continue their studies. Large amount of them, especially those who graduated from better universities, do not return to Iran. the emigration of these people, who are considered to be of the best graduates in the country, and their non-return to the country leads to Decrease in the average capability of the country's human resources, waste of resources spent on them from a national perspective, Decrease in the productivity at the internal universities, industries and services and increase in the country's scientific distance from the other countries. the 1370s are an important section in the country's history due to post-war... 

There are two customer sides, a demand and a supply-side, in a two-sided platform. Through this research, we study customer's behavior in demand side, which are passengers in a ride-hailing platform. At first, we determine behavior that is considered strategic behavior, and based on this behavior, we divide passengers into two separate groups, strategic and non-strategic passengers. We want to address the differences between strategic and non-strategic passengers' performance based on their acceptance rate and acceptance time of their requests. Then, we investigate the difference between their monthly number of requests, rides, and total monthly expenditures. Furthermore, we run a logistic... 

With the rise of the sharing economy, customers’ motivations to participate has become a controversial phenomenon. The sharing economy has different industries that might itself be a reason for the emergence of different incentives in customers. Moreover, these industries can affect motivation by controlling various touchpoints Two dimensions, quantity and quality illustrate the impact of touchpoints The encounter of touchpoints with both of the provider and consumer side might confuse companies to choose the best composition of has been conducted to identify the importance of motives to use different industries of the sharing economy and examine the impact of the brands’ touchpoints . In... 

Nowadays, social media and messenger applications have found widespread usage in peoples’ lives, making them spend numerous hours on these services. As a consequence, it’s imperative for businesses to maintain presence and carry out advertising campaigns in these social networks. Telegram, which started out as a messaging application, has now grown into a prevalent social media platform in many countries. As a result, Telegram channels demonstrate high potential in publishing advertisements, furthering the promotion of products, and even asserting influence on political, societal, and economic situations. The cost of advertising on channels depends on the number the channel’s subscribers... 

Decision about insurance is affected by how customers evaluate possible future scenarios. Our purpose is to find out whether providing statistical information about probabilities affect the customers’ willing to take life insurance or not. In other words, we want to know if people are ambiguity averse in the context of insurance. Means that if they are more willing to take insurance when the loss probability is vague or when it is known. We will separate the respondents into two groups and will provide half of them with information about the death probability in their age zone, and will not inform the other half about this probability. Then ask both groups their willingness to take a life... 

This study considers an online multi-period assortment optimization problem over multiple replenishment cycles. The retailer chooses a subset from N substitutable products and decides how many of each product to order and sell at each time period. Retailer is constrained by a total inventory capacity, a cardinality constraint on the product variety (display space), and predetermined replenishment time intervals. The assortment selection is modeled as a Multi-armed Bandit problem and the customers' choice is modeled by the Multinomial Logit (MNL) choice model with dynamic substitution. The objective is to optimize the revenue by actively learning the censored demand and improving the offering... 

Using customer relationship management systems has led to the formation of databases containing businesses customer information. Increased competition in the markets, limited resources and high costs of attracting new customers compared to retaining existing customers have made customer retention an inevitable subject for business owners. Meanwhile, insurance companies, which due to their long history have suitable databases of product information and their customers, have resorted to using their databases to manage the relationship with their customers. In this research, while predicting customers churn in health insurance, as one of the most widely used products of domestic insurance... 

Exchange-rate has always been one of the critical macroeconomic factors influencing Iran’s economy. As a representative of the whole economy, the stock market is also affected by exchange rate fluctuations. However, the direction and the delay of this impact is not similar for all firms. This study aims to find the time and direction of the reactions to dollar fluctuations in the two most recent jumps, during 1390 and 1397, for all firms listed on Tehran Securities Exchange. It also seeks to determine why among stocks with a positive reaction, some react sooner, and some react later, based on their specific characteristics. Using a distributed lag model, we found that about one-half of the... 

With the huge growth of cryptocurrencies in recent years, the attention of investors has been drawn to predict and invest in it. Because of the high volatility of this market, which includes a large share of Bitcoin, there is a need for good forecasting in it. Although past studies have been able to accurately predict the price of Bitcoin using fundamental variables and variables related to the blockchain network, less attention has been paid to the use of variables related to investor sentiments in this market. In this research, variables widely used in the literature that show the emotions and attention of investors, such as sentiment analysis of Twitter texts, Google search index,...