Sergey Mityagin

• Doctor of Philosophy
• Head of Department at ITMO University

Finding the shortest path between two vertices in a graph is essential in various applications, including logistics, social networks, citation graphs, and others. Given the need for repeated pathfinding in large graphs, accelerating this process is crucial. This article introduces a novel method that leverages the inherent clustering of graphs, ena...

Highlights What are the main findings? For smart city management, LLM-based multi-agent systems achieve 94–99% accuracy in routing urban queries and demonstrate significant improvements in response quality (G-Eval scores of 0.68–0.74) compared to standalone LLMs (0.30–0.38). Achievement of high scores in routing queries and response accuracy is pos...

Highlights Main findings: By comparing traditional gravity-based and optimization-focused approaches used for trip distribution modeling, we identified spatial conditions under which these two mathematical frameworks can yield divergent provision assessments that could lead to varying urban planning and policy decisions. To support the choice of th...

This paper considers the issues of assessing the potential of urban streets development in terms of the composition and placement of commercial services for the population. The proposed method considers the network of city streets as the key public space of the city, and services as the main tool for satisfying the physical, cultural, and aesthetic...

The paper considers a set of methods that solve the problem of identifying central places in the current urban environment. The problems of research are caused by the need to consider the proximity and location of the actual central places of cities and settlements in almost all processes of planning development and transformation of the environmen...

The article considers the approach to creating such a tool as a Digital Master Plan and using it to generate the requirements for the development of territories automatically. The specificity of the Digital Master Plan is that it takes into account the context of the city, or, more precisely, the conditions of placement of the territory to be devel...

The article discusses an approach to assessing the condition of urban lawns based on computer vision. The assessment of the condition of urban lawns is based on the identification of the composition of plant species growing on the lawn, since the species composition can characterize the state of the soil and growing conditions, as well as the chara...

The article considers methods of solving the problem of optimal planning of public spaces, based on the approach of network modeling of the urban environment. The problematic of the work, is relevant for many modern cities, and lies in the fact that the urban environment is poorly adapted to provide quality leisure for young people. This leads to v...

The article deals with the problem of automation and decision-making support in forming sustainable assortments of plant species for landscaped areas of cities, taking into account environmental factors, conditions of growing, properties of plant species, and landscaping practices adopted in the region. The automation of plant species and compositi...

This paper examines a method for assessing spatial inequality through access to opportunities and urban services based on modeling an intermodal graph of accessibility of urban areas. The goal is to obtain ratings on the difference in physical access to services and opportunities on public transport by social groups. This is done by collecting data...

The urban population interacts with service facilities on a daily basis. The information on population-facilities interactions is considered when analyzing the current city organization and revealing gaps in infrastructure at the neighborhood level. However, often this information is limited to several observation areas. The paper presents a new gr...

The paper considers the problem of spatial inequality of agglomerations. The paper proposes an approach to the estimation of spatial inequality based on the intermodal transport graph and data on the placement of urban services in the agglomeration cities. This approach has been experimentally tested on the agglomeration of St. Petersburg. The resu...

The urban population interacts with service facilities on a daily basis. The information on population-facilities interactions is considered when analyzing the current city organization and revealing gaps in infrastructure at the neighborhood level. However, often this information is limited to several observation areas. The paper presents a new gr...

By 2050, around 70% of people will live in urban areas. According to the 11.2 target of UN SDG “Sustainable cities and communities” to provide access to safe, affordable, accessible, and sustainable transport systems for all, the aim of the paper presented was to investigate accessibility and connectivity of urban territories by public transport sy...

This paper examines a method for assessing spatial inequality through access to opportunities and urban services based on modeling an intermodal graph of accessibility of urban areas. The goal is to obtain ratings on the difference in physical access to services and opportunities on public transport by social groups. This is done by collecting data...

This paper presents a method for generating urban blocks. Urban blocks are the basis from which urban processes are modelled and assessments of the current situation are made. The proposed method allows with the additional land use data, clustering algorithms and computational operations to obtain a more complete representation of urban blocks. The...

This paper about sustainable urban development from an ecological perspective. With increasing urbanization and the degradation of green infrastructure, the concept of ecosystem services helps to assess the services people receive from their interaction with nature. Cultural ecosystem services refer to intangible goods that play an important role i...

The problem considered in the article is the systematic lack of data on the objects of the urban environment for management and decision-making. This problem is particularly acute in the lack of data on points of attraction, informal and thematic places of interest. At the same time, this kind of information is necessary for the qualitative develop...

The article presents a method for modelling an intermodal graph of accessibility of urban areas. The accessibility of the city's territories is usually understood as a zone where a person can walk or get by transport for a certain time from a given point. Accessibility assessment is fundamental in the problems of computational urbanism and is used...

The article proposes a method of estimating the number and structure of the population living in each dwelling house of the city. This information is used in solving a number of applied problems of urban analysis and urban planning, including the design of transportation systems, the provision of social infrastructure, and commercial services. Howe...

Accurate information about real estate in the city, and about residential buildings in particular, is the most important resource for managing the development of the urban environment. Information about residential buildings, for example, the number of residents, is used in the inventory and digitization of the urban economy and subsequently become...

The article deals with the issue of value-based city management. Value-based management is one of the most important attributes of the concept of smart cities of the new generation. It relates to the transition from the technological understanding of a smart city to the concept of a city adapted to a person to create a new quality of life and creat...

The article presents a method for processing and analyzing text data of users of social networks to determine the practical options for using urban environment objects by citizens. For example, in one Park there is a practice of sports, and in another walking with baby strollers. This allows us to solve the problem of collecting preliminary data in...

The article is devoted to integration of the concepts of smart city and green city. Many business experts present smart city idea as digitalization of urban infrastructure. By other side, many researchers prove that these two concepts influence strongly on each other and we can meet in international science such definitions as smart greens and gree...

In this paper, we present an approach to drug addiction simulation and forecasting in the medium and long terms in cities having a high population density and a high rate of social communication. Drug addiction forecasting is one of the basic components of the antidrug policy, giving informational and analytic support both at the regional and at th...

Currently there are more than 7 billion people living on Earth and at least 1 million inhabitants globally live in cities. Modern cities start to use smart infrastructure and digitalization for sustainable development. The article is devoted to considering the smart technologies in city participative budgeting. City budget and financial and economi...

The paper describes theoretical peculiarities of e-government technology introduction in suburbanized areas in the medical care of the population. The purpose of the paper is to analyze the causes, factors, characteristics and conditions of the introduction of e-government technologies in the suburban areas. The distinctive features in the needs of...

Determining the procedure and approaches to automating real estate appraisal is an important condition for improving e-government on the basis of one of the key economic sectors throughout the state. The paper discusses a set of approaches to the analysis of factors affecting the pricing of objects that offer in a market of residential real estate....

The article presents results of a study of the problems, needs and ideas about the composition of decisions of a smart city when forming the concept of smart city for St. Petersburg. An independent survey of government officials was conducted. It was done in order to reveal their ideas about the composition of the necessary decisions for a smart ci...

This article discusses the use of machine learning methods for assessing and predicting the perception of urban environment by citizens. The research is based on the analysis of the data collected from social surveys and characteristics of the environment from open sources. The urban environment is seen as a complex system that can be analyzed thou...

The article discusses a systematic approach to modeling the requirements of citizens to the urban environment. An approach based on the traditional methodology of systems analysis in the subject area of urban environment management, adapted for human. Modern approaches to creating a comfortable urban environment involve the needs of citizens. At th...

Assessing the investment attractiveness of the territory is an important and non-trivial task for modern cities. The development of urban areas and their attractiveness for citizens depends, inter alia, on the variety of services presented on the territory. At the same time, modern cities face new challenges to their development, such as the expans...

The article considers an approach to the design of a universal upper level conceptual model of urban data and its application for the formation of a relational database for development and landscaping projects. The conceptual model of urban data is designed to solve the problem of fragmentation and fragmentation of urban data in the context of the...

This article aims to assess and forecast the dynamics of a regional green economy. The research relevance is determined by the need to develop theoretical and methodological basis of the green economy for the transition period and to identify criteria basis for assessing the state and regional level of it. The authors applied the modern methods, wh...

In the second half of the twentieth century, cities showed themselves as the most effective form of organization of life in space. Nowadays, most of the citizens of the world live in cities. But at the same time the disadvantages of life in the city also appeared. One of the ways to overcome the emerging problems was suburbanization and the formati...

Cities in the world face the problem of combining competitiveness and sustainable development at the same time. Urban space forms a much more subtle matter in terms of the simultaneous scale and point of processes spectrum. Certainly, the city is the primary source of generation fundamental anthropogenic factors within the framework of human activi...

The paper presents the study on identification and systematic description of typical behavioral patterns of drug usage. The dataset is based on the qualitative interviews with 70 drug users and the survey within 80 experts of federal drug control service in St.Petersburg obtained in the course of 2015. A behavioural pattern is considered as a seque...

The paper discusses about interoperability mechanisms in the scale of urban IT infrastructure. It represented by a variety of interacting information systems and requirements for complex structural layers that construct urban networks. Government information systems, according to the existing legislation, automate only a certain list of priority fu...

The paper examines the study of interoperability mechanisms in the scale of urban IT infrastructure, represented by a variety of interacting information systems and also framework analysis of the similarity level about information systems for practical recommendations on restructuring the existing design pattern of systems and reorganization of the...

This paper presents an approach to study spatial segregation through clusterization of food services in St. Petersburg, Russia, based on analysis of geospatial and user-generated data from open sources. We consider a food service as an urban place with social and symbolic features and we track how popularity (number of reviews) and rating of food v...

This paper describes the methodology of estimation of sustainable development of a region on the basis of a system of weighted target indicators, adjusted in accordance with goals and tasks of regional management. The authors analyze an example of practical application of the methodology in St. Petersburg and draw the conclusions about an influence...

The article suggests considering a Smart city as a complex of innovative projects implemented in various sectors of an urban economy. The expediency of implementation of the projects is determined, on the one hand, by the requirements of national and international standards and regulatory documents on urban development, and, on the other hand, by t...

This paper describes the approaches to mathematical modeling of subjective opinions and value orientations of individual citizens and the society in whole in order to estimate and consider them in managerial decision making in a city. The aforementioned subjective categories are suggested to be expressed as judgment structures, mental states, menta...

The paper describes a problem of computer simulation of critical phenomena in complex social systems on a petascale computing systems in frames of complex networks approach. The three-layer system of nested models of complex networks is proposed including aggregated analytical model to identify critical phenomena, detailed model of individualized n...

Informational and analytical support of the authorities is one of the most relevant subject on the development of a decision support system. This article describes the current process of information-analytical support of the authorities by the example of St. Petersburg, Russia, including the analysis of social networks, as well as an analysis of th...

This paper describes an approach for modeling of potentially critical situations in the society. The modeling approach is proposed to improve the efficiency of the local government management, taking into account potentially critical situations that may arise on a personal level, social group's level and society as a whole. The use of proposed meth...

The data-driven probabilistic model of MRT-based population mobility is developed for St. Petersburg, Russia. This model is based on impersonal data which contains only the inflows and outflows of the passengers in the MRT stations; the personal tracks of the passengers are unavailable. The model explains the spatiotemporal variability of MRT traff...

Urban mobility is an important part of many studies related to the planning of large urban areas. This paper describes an approach for the evaluation of urban mobility as geosocial dynamics on the territory with high population density on the basis of surveillance cameras. We examine various methods of image and video processing for the evaluation...

This paper describes an approach for modeling of potentially critical situations in the society. The potentially critical situations arising from non-compliance concepts and norms accepted in the society and the real trends of the territory are considered. Such situations appear in the absence of attention to society mental state in the management...

In this paper, we describe the anti-crisis regional management approach based on the model of potentially critical situations with the use of g2c open information exchange. This approach is propose to improve the efficiency of the local government management, taking into account potentially critical situations that may arise on a personal level, so...

Background A meta-analysis of published data was conducted to investigate the overall risks of hypertension and QTc prolongation in patients with advanced non-small cell lung cancer (NSCLC) who were receiving vandetanib. Methods A computerized search through electronic databases, including PubMed and Embase (until Dec 2014), was performed to obtain...

This paper presents approach for mining and analysis of data from social media which is based on using Map Reduce model for processing big amounts of data and on using composite applications for performing more sophisticated analysis which are executed on environment for distributed computing-based cloud platform. We applied this system for creatio...