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Showing 71 to 73 of 73 (0.058 seconds)| 71 |
On-Demand Composition of Smart Service Systems in Decentralized EnvironmentsWutzler, Markus 13 September 2018 (has links)
The increasing number of smart systems inevitably leads to a huge number of systems that potentially provide independently designed, autonomously operating services. In near-future smart computing systems, such as smart cities, smart grids or smart mobility, independently developed and heterogeneous services need to be dynamically interconnected in order to develop their full potential in a rather complex collaboration with others. Since the services are developed independently, it is challenging to integrate them on-the-fly at run time. Due to the increasing degree of distribution, such systems operate in a decentralized and volatile environment, where central management is infeasible. Conversely, the increasing computational power of such systems also supersedes the need for central management. The four identified key problems of adaptable, collaborative Smart Service Systems are on-demand composition of complex service structures in decentralized environments, the absence of a comprehensive, serendipity-aware specification, a discontinuity from design-time specification to run-time execution, and the lack of a development methodology that separates the development of a service from that of its role essential to a collaboration.
This approach utilizes role-based models, which have a collaborative nature, for automated, on-demand service composition. A rigorous two-phase development methodology is proposed in order to demarcate the development of the services from that of their role essential to a collaboration. Therein, a collaboration designer specifies the collaboration including its abstract functionality using the proposed role-based collaboration specification for Smart Service Systems. Thereof, a partial implementation is derived, which is complemented by services developed in the second phase. The proposed middleware architecture provides run-time support and bridges the gap between design and run time. It implements a protocol for coordinated, role-based composition and adaptation of Smart Service Systems. The approach is quantitatively and qualitatively evaluated by means of a case study and a performance evaluation in order to identify limitations of complex service structures and the trade-off of employing the concept of roles for composition and adaptation of Smart Service Systems.:1 Introduction
1.1 Motivation
1.2 Terminology
1.3 Problem Statement
1.4 Requirements Analysis
1.5 Research Questions and Hypothesis
1.6 Focus and Limitations
1.7 Outline
2 The Role Concept in Computer Science
2.1 What is a Role in Computer Science?
2.2 Roles in RoleDiSCo
3 State of the Art & Related Work
3.1 Role-based Modeling Abstractions for Software Systems
3.1.1 Classification
3.1.2 Approaches
3.1.3 Summary
3.2 Role-based Run-Time Systems
3.2.1 Classification
3.2.2 Approaches
3.2.3 Summary
3.3 Spontaneously Collaborating Run-Time Systems
3.3.1 Classification
3.3.2 Approaches
3.3.3 Summary
3.4 Summary
4 On-Demand Composition and Adaptation of Smart Service Systems
4.1 RoleDiSCo Development Methodology
4.1.1 Role-based Collaboration Specification for Smart Service Systems
4.1.2 Derived Partial Implementation
4.1.3 Player & Context Provision
4.2 RoleDiSCo Middleware Architecture for Smart Service Systems
4.2.1 Infrastructure Abstraction Layer
4.2.2 Context Management
4.2.3 Local Repositories & Knowledge
4.2.4 Discovery
4.2.5 Dispatcher
4.3 Coordinated Composition and Subsequent Adaptation
4.3.1 Initialization and Planning
4.3.2 Composition: Coordinating Subsystem
4.3.3 Composition: Non-Coordinating Subsystem
4.3.4 Competing Collaborations & Negotiation
4.3.5 Subsequent Adaptation
4.3.6 Terminating a Pervasive Collaboration
4.4 Summary
5 Implementing RoleDiSCo
5.1 RoleDiSCo Development Support
5.2 RoleDiSCo Middleware
5.2.1 Infrastructure Abstraction Layer
5.2.2 Knowledge Repositories and Local Class Discovery
5.2.3 Planner
6 Evaluation
6.1 Case Study: Distributed Slideshow
6.1.1 Scenario
6.1.2 Phase 1: Collaboration Design
6.1.3 Phase 2: Player Complementation
6.1.4 Coordinated Composition and Adaptation at Run Time
6.2 Runtime Evaluation
6.2.1 General Testbed Setup and Scenarios
6.2.2 Discovery Time
6.2.3 Composition Time
6.2.4 Discussion
6.3 The ›Role‹ of Roles
6.4 Summary
7 Conclusion
7.1 Summary
7.2 Research Results
7.3 Future Work
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Role Based Access Control (RBAC) in the context of Smart Grids : Implementing and Evaluating a Role Based Access Control System for Configuration Loading in a Substation from a Desktop / Rollbaserad åtkomstkontroll (RBAC) för smarta nät : Implementering och utvärdering av ett rollbaserat åtkomstkontrollsystem för konfigurationsinläsning i en transformatorstation från en datorapplikation.Ducornaud, Gatien January 2023 (has links)
Access control is a crucial aspect of cybersecurity, and Role Based Access Control (RBAC) is a typical framework for controlling the access to specific resources. However, in the context of Smart Grids, the usual authentication solution of using a trusted identity provider might not be possible to provide authentication of a user, as systems cannot rely on external services. This, in addition to devices in a substation being usually strictly controlled, means that having an RBAC limited to a desktop application can be necessary. Moreover, the cost of adding additional layers of security needs to be considered too, as the cost of adding specific features can vary significantly. This thesis thus looks into the existing solutions for desktop applications in substations, explains their viability and implements an RBAC system using Group Nesting in Windows user management, in the context of a configuration loading application on a main computer in a substation. It is then used to evaluate the cost of this new solution, in terms of maintainability, usability and flexibility, compared to the gained security. This is done by using static analysis of both codebases, and evaluation of usability and security. It shows that security can be added for a reasonable cost using Group Nesting in Smart Grids if the focus is to delegate some tasks to the directory, improving on the security of the application and the system as a whole. / Åtkomstkontroll är en viktig aspekt av cybersäkerhet, och rollbaserad åtkomstkontroll (RBAC) är ett typiskt ramverk för att kontrollera åtkomsten till specifika resurser. I smarta nät kan det dock hända att den vanliga autentiseringslösningen med en betrodd identitetsleverantör inte är tillräcklig för att autentisera en användare, eftersom systemen inte kan förlita sig på externa tjänster. Detta, förutom att enheterna i en transformatorstation vanligtvis är strikt kontrollerade, innebär att det kan vara nödvändigt att ha en RBAC som är begränsad till en datorapplikation. Dessutom måste kostnaden för att lägga till ytterligare säkerhetslager också beaktas, eftersom kostnaden för att lägga till specifika funktioner kan variera avsevärt. Denna avhandling omfattar därför dels undersökning av de befintliga lösningarna för datorapplikation i transformatorstationer, dels redogörelse av genomförbarheten och dels implementeringen av ett RBAC-system. Implementationen använder funktionen Group Nesting i Windows-användarhantering och integrerades i en applikation för konfigurationsinläsning på en huvuddator i en transformatorstation. Därefter utvärderas kostnaden för denna nya lösning i fråga om underhållbarhet, användbarhet och flexibilitet i förhållande till den ökade säkerheten. Detta görs med hjälp av statisk analys av de båda mjukvarulösningarna och utvärdering av användbarhet och säkerhet. Det visar att säkerheten kan ökas till en rimlig kostnad med hjälp av Group Nesting i smarta nät, om fokus ligger på att delegera vissa uppgifter till en katalog, vilket förbättrar säkerheten i applikationen och systemet som helhet. / Le contrôle ’daccès est un aspect essentiel de la cybersécurité, et utiliser des rôles pour implémenter cela est souvent le modèle recommandé. Pour autant, dans le contexte des réseaux électriques intelligents, il ’nest pas toujours possible de posséder un parti tiers fiable qui puisse faire autorité car il ne faut pas dépendre de systèmes extérieurs. ’Cest particulièrement vrai dans une sous-station où les ordinateurs connectés ont un rôle strictement défini. Ainsi il peut être nécessaire ’davoir un système de contrôle ’daccès basé sur les rôles (RBAC, Role-Based Access Control) uniquement contenu sur un ordinateur. Il faut de plus pouvoir estimer le coût de cette sécurité supplémentaire. Ce rapport évalue les solutions existantes dans cette situation et leur viabilité, et implémente un RBAC grâce à ’limbrication de groupe ’dutilisateur Windows, pour une application desktop pour le chargement de configuration pour l´ordinateur central ’dune sous-station. Cette implémentation est ensuite utilisée pour estimer les coûts associés à ’lajout ’dun RBAC en termes de maintenabilité, ’dutilisabilité et de flexibilité par rapport aux gains de sécurité. Cela est fait à travers des outils ’danalyse statique sur le code avant et après implémentation et ’dautres techniques ’danalyse de la sécurité et de la maintenabilité. Cela permet de montrer que, avec ’limbrication de groupes, il est possible ’dobtenir un niveau de sécurité satisfaisant tout en limitant les coûts associés, grâce au fait de déléguer les fonctions de gestion ’dutilisateur à un système de directory (répertoire).
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Streamlining Certification Management with Automation and Certification Retrieval : System development using ABP Framework, Angular, and MongoDB / Effektivisering av certifikathantering med automatisering och certifikathämtning : Systemutveckling med ABP Framework, Angular och MongoDBHassan, Nour Al Dine January 2024 (has links)
This thesis examines the certification management challenge faced by Integrity360. The decentralized approach, characterized by manual processes and disparate data sources, leads to inefficient tracking of certification status and study progress. The main objective of this project was to construct a system that automates data retrieval, ensures a complete audit, and increases security and privacy. Leveraging the ASP.NET Boilerplate (ABP) framework, Angular, and MongoDB, an efficient and scalable system was designed, developed, and built based on DDD (domain-driven design) principles for a modular and maintainable architecture. The implemented system automates data retrieval from the Credly API, tracks exam information, manages exam vouchers, and implements a credible authentication system with role-based access control. With the time limitations behind the full-scale implementation of all the planned features, such as a dashboard with aggregated charts and automatic report generation, the platform significantly increases the efficiency and precision of employee certification management. Future work will include these advanced functionalities and integrations with external platforms to improve the system and increase its impact on operations in Integrity360.
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