Towards a Holistic Cloud System with End-to-End Performance Guarantees

Computing technologies are undergoing a relentless evolution from both the hardware and software sides, incorporating new mechanisms for low-latency networking, virtualization, operating systems, hardware acceleration, smart services orchestration, serverless computing, hybrid private-public Cloud solutions and others. Therefore, Cloud infrastructures are becoming increasingly attractive for deploying a wider and wider range of applications, including those with more and more stringent timing constraints, like the emerging use case of deploying time-critical applications. However, despite the availability of a number of public Cloud offerings, and of products (or open-source suites) for deploying in-house private Cloud infrastructures, still there are no solutions readily available for managing time-critical software components with predictable end-to-end timing requirements in the range of hundreds or even tens of milliseconds. The goal of this discussion is to present the multi-domain challenges associated with orchestrating a holistic Cloud system with endto- end guarantees, which is the subject of my current PhD investigations

Микросервисная архитектура виртуальных тренажерных комплексов

The task of automating and reducing the complexity of the process of developing virtual training complexes is considered. The analysis of the subject area showed the need to move from a monolithic to a service-oriented version of the architecture. It is found that the use of a monolithic architecture in the implementation of virtual training complexes limits the possibility of modernizing the system, increases its software complexity, and makes it difficult to implement an interface for managing and monitoring the training process. The general concept of the microservice architecture of virtual training complexes is presented, and definitions of the main and secondary components are given. The scientific novelty of the research lies in the transition from the classical monolithic architecture in the subject area of the HTC to the microservice architecture; eliminating the shortcomings of this approach by implementing a single protocol for the exchange of information between modules; separation of network interaction procedures into software libraries to unify and improve the reliability of the system. The use of isolated, loosely coupled microservices allows developers to use the best technologies, platforms and frameworks for their implementation; separate the graphical interface of the simulator instructor from the visualization and virtual reality system; provide the ability to flexibly replace the main components (visualization, interface, interaction with virtual reality) without changing the architecture and affecting other modules. The decomposition of the structural model of the microservice architecture is carried out, and the specifics of the functioning of the main components are presented. The implementation of microservices networking libraries and a JSON-based data exchange protocol is considered. The practical significance of the proposed architecture lies in the possibility of parallelization and reducing the complexity of the development and modernization of training complexes. The features of the functioning of the systems implemented in the proposed microservice architecture are analyzed.В представленной работе рассматривается задача автоматизации и снижения сложности процесса разработки виртуальных тренажерных комплексов. Проведенный анализ предметной области показал необходимость перехода от монолитного подхода к сервис-ориентированному варианту архитектуры. Выявлено, что использование монолитной архитектуры при реализации виртуальных тренажерных комплексов ограничивает возможность модернизации системы, увеличивает ее программную сложность, затрудняет реализацию интерфейса для управления и мониторинга процесса подготовки. Представлена общая концепция микросервисной архитектуры виртуальных тренажерных комплексов, даны определения основных и второстепенных компонентов. Научная новизна исследования заключается в переходе от классической монолитной архитектуры в предметной области ВТК к микросервисной архитектуре и устранении недостатков данного подхода за счет реализации единого протокола обмена информацией между модулями и отделения процедур сетевого взаимодействия в программные библиотеки в каждом микросервисе для унификации и повышения надежности работы системы. Применение изолированных, слабо связанных микросервисов позволяет использовать оптимальные технологии, платформы и фреймворки для их реализации, отделить графический интерфейс инструктора тренажера от системы визуализации и виртуальной реальности, обеспечить возможность гибкой замены основных компонентов (визуализации, интерфейса, взаимодействия с виртуальной реальностью) без изменения архитектуры и влияния на остальные модули. Осуществлена декомпозиция структурной модели микросервисной архитектуры, представлена специфика функционирования основных компонентов. Рассмотрена реализация библиотек сетевого взаимодействия микросервисов и протокола обмена данных на основе JSON. Практическая значимость предложенной архитектуры состоит в возможности распараллеливания и снижения сложности процесса разработки и модернизации тренажерных комплексов. Проанализированы особенности функционирования систем, реализованных на предложенной микросервисной архитектуре

Микросервисная архитектура виртуальных тренажерных комплексов

В представленной работе рассматривается задача автоматизации и снижения сложности процесса разработки виртуальных тренажерных комплексов. Проведенный анализ предметной области показал необходимость перехода от монолитного подхода к сервис-ориентированному варианту архитектуры. Выявлено, что использование монолитной архитектуры при реализации виртуальных тренажерных комплексов ограничивает возможность модернизации системы, увеличивает ее программную сложность, затрудняет реализацию интерфейса для управления и мониторинга процесса подготовки. Представлена общая концепция микросервисной архитектуры виртуальных тренажерных комплексов, даны определения основных и второстепенных компонентов. Научная новизна исследования заключается в переходе от классической монолитной архитектуры в предметной области ВТК к микросервисной архитектуре и устранении недостатков данного подхода за счет реализации единого протокола обмена информацией между модулями и отделения процедур сетевого взаимодействия в программные библиотеки в каждом микросервисе для унификации и повышения надежности работы системы. Применение изолированных, слабо связанных микросервисов позволяет использовать оптимальные технологии, платформы и фреймворки для их реализации, отделить графический интерфейс инструктора тренажера от системы визуализации и виртуальной реальности, обеспечить возможность гибкой замены основных компонентов (визуализации, интерфейса, взаимодействия с виртуальной реальностью) без изменения архитектуры и влияния на остальные модули. Осуществлена декомпозиция структурной модели микросервисной архитектуры, представлена специфика функционирования основных компонентов. Рассмотрена реализация библиотек сетевого взаимодействия микросервисов и протокола обмена данных на основе JSON. Практическая значимость предложенной архитектуры состоит в возможности распараллеливания и снижения сложности процесса разработки и модернизации тренажерных комплексов. Проанализированы особенности функционирования систем, реализованных на предложенной микросервисной архитектуре

SynerCrete’18: interdisciplinary approaches for cement-based materials and structural concrete: synergizing expertise and bridging scales of space and time, vol. 2

info:eu-repo/semantics/publishedVersio

Dynamic digital factories for agile supply chains: An architectural approach

Digital factories comprise a multi-layered integration of various activities along the factories and product lifecycles. A central aspect of a digital factory is that of enabling the product lifecycle stakeholders to collaborate through the use of software solutions. The digital factory thus expands outside the company boundaries and offers the opportunity to collaborate on business processes affecting the whole supply chain. This paper discusses an interoperability architecture for digital factories. To this end, it delves into the issue by analysing the key requirements for enabling a scalable factory architecture characterized by access to services, aggregation of data, and orchestration of production processes. Then, the paper revises the state-of-the-art w.r.t. these requirements and proposes an architectural framework conjugating features of both service-oriented and data-sharing architectures. The framework is exemplified through a case study

How to Place Your Apps in the Fog -- State of the Art and Open Challenges

Fog computing aims at extending the Cloud towards the IoT so to achieve improved QoS and to empower latency-sensitive and bandwidth-hungry applications. The Fog calls for novel models and algorithms to distribute multi-service applications in such a way that data processing occurs wherever it is best-placed, based on both functional and non-functional requirements. This survey reviews the existing methodologies to solve the application placement problem in the Fog, while pursuing three main objectives. First, it offers a comprehensive overview on the currently employed algorithms, on the availability of open-source prototypes, and on the size of test use cases. Second, it classifies the literature based on the application and Fog infrastructure characteristics that are captured by available models, with a focus on the considered constraints and the optimised metrics. Finally, it identifies some open challenges in application placement in the Fog

Logic-based Technologies for Intelligent Systems: State of the Art and Perspectives

Together with the disruptive development of modern sub-symbolic approaches to artificial intelligence (AI), symbolic approaches to classical AI are re-gaining momentum, as more and more researchers exploit their potential to make AI more comprehensible, explainable, and therefore trustworthy. Since logic-based approaches lay at the core of symbolic AI, summarizing their state of the art is of paramount importance now more than ever, in order to identify trends, benefits, key features, gaps, and limitations of the techniques proposed so far, as well as to identify promising research perspectives. Along this line, this paper provides an overview of logic-based approaches and technologies by sketching their evolution and pointing out their main application areas. Future perspectives for exploitation of logic-based technologies are discussed as well, in order to identify those research fields that deserve more attention, considering the areas that already exploit logic-based approaches as well as those that are more likely to adopt logic-based approaches in the future

Robust Contract Evolution in a TypeSafe MicroServices Architecture

Microservices architectures allow for short deployment cycles and immediate effects but offer no safety mechanisms when service contracts need to be changed. Maintaining the soundness of microservice architectures is an error-prone task that is only accessible to the most disciplined development teams. We present a microservice management system that statically verifies service interfaces and supports the seamless evolution of compatible interfaces. We define a compatibility relation that captures real evolution patterns and embodies known good practices on the evolution of interfaces. Namely, we allow for the addition, removal, and renaming of data fields of a producer module without breaking or needing to upgrade consumer services. The evolution of interfaces is supported by runtime generated proxy components that dynamically adapt data exchanged between services to match with the statically checked service code.The model was instantiated in a core language whose semantics is defined by a labeled transition system and a type system that prevents breaking changes from being deployed. Standard soundness results for the core language entail the existence of adapters, hence the absence of adaptation errors and the correctness of the management model. This adaptive approach allows for gradual deployment of modules, without halting the whole system and avoiding losing or misinterpreting data exchanged between system nodes. Experimental data shows that an average of 69% of deployments that would require adaptation and recompilation are safe under our approach