Iskanje po katalogu digitalne knjižnice

Opis: Delegation of authority remains a critical yet insufficiently addressed capability in SelfSovereign Identity (SSI) systems. Building on an existing delegation model that introduced the concept of a Verifiable Mandate (VM) for expressing authority and access rights, this paper extends the approach with a rigorous formalization of delegation semantics, enabling unambiguous reasoning over roles, grants, and constraints. The formal model is aligned with standards from the World Wide Web Consortium (W3C), and its constructs are embedded into an extended credential schema that preserves compatibility with the Verifiable Credentials (VC) data model while introducing delegation-specific attributes. A generalized VM schema is defined, supporting both generic and business-specific instantiations, and ensuring structural and semantic interoperability. Policy compliance is operationalized through a policy-based enforcement architecture, where rules are authored in the Rego language and evaluated at runtime by the Open Policy Agent (OPA). The architecture incorporates trusted registries for schema and policy distribution, allowing verifiers to define and enforce context-specific delegation rules in a modular and interoperable manner. Validation through realistic scenarios, such as postal service and academic use cases, demonstrates how formal semantics, schema validation, and language-based policy enforcement can be combined to enable secure, verifiable, and context-aware delegation in SSI ecosystems.
Ključne besede: self-sovereign identity, delegation, verifiable mandate, formalization, policy-based enforcement, verifiable credentials, blockchain, language-based security
Objavljeno v DKUM: 02.10.2025; Ogledov: 0; Prenosov: 9
Celotno besedilo (1,46 MB)

Opis: Background/Purpose: Empirical evidence suggests that a leader’s political skills may act as a moderator that might decrease the effect of prototypicality’s impact on trust and on leadership effectiveness. The study investigated leading political skills as second-level regulatory variables in connection to leader effectiveness and trust with the purpose of testing a cross-level moderated mediation model within a traditionally collectivist culture like Turkey in efforts to contextualize and expand understanding of leadership prototype perception. Methods: A total of 442 service sector employees and 28 executive managers were interviewed. Two surveys in two separate time periods were conducted. Multilevel path analysis was used to evaluate the hypotheses. Results: The findings suggest that there is a strong and significant impact of leader prototypicality on leadership effectiveness and a direct impact on trust. Results indicate that leaders who are trusted by their subordinates are perceived as more effective in their leadership roles. Lower levels of trust from subordinates are negatively associated with leader effectiveness. Conclusion: If leaders cannot provide their followers a contextualized sense of empowerment and development, they are perceived to not provide high levels of emotional trust. Therefore, there is greater need for multilevel contextualized studies taking account of collective, two-sided, embedded experiences within groups.
Ključne besede: leader political behavior, political skills, leader effectiveness, trust, social identity theory, Turkiye
Objavljeno v DKUM: 14.08.2025; Ogledov: 0; Prenosov: 3
Celotno besedilo (1,29 MB)
Gradivo ima več datotek! Več...

Opis: A collaborative art education project involving Japan and the Czech Republic focused on the enculturation processes experienced by two teachers and their students, how immersion in visual arts can contribute to cultural understanding and the reconciliation of two pedagogical approaches to art. This project also addressed this reconciliation with the unknowable ‘Other’ through the creation of artwork, ‘travelling objects’ and collaborative teaching. Outcomes include similarities between objects from the two countries and two pedagogical approaches and suggest that participants strived to reconcile the Other, thus creating a spatial and relational intermediate space by dealing with those objects and communicating together.
Ključne besede: cultural inclusion, cultural identity, art education, collaborative learning, Other
Objavljeno v DKUM: 24.07.2025; Ogledov: 0; Prenosov: 1
Celotno besedilo (595,34 KB)
Gradivo ima več datotek! Več...

Opis: Purpose – The purpose of this paper is to develop a methodology for shaping the tourist spatial identity of the city and to take advantage of it to discover alternative urban outdoor spaces. As the number of indoor visitors has been limited due to the COVID-19 pandemic, open urban areas such as streets, squares and parks have become more important tourist locations. Design/methodology/approach – The assessment methodology consists of two basic steps. In the first step, the authors look for places or points that are carriers of spatial identity. For this purpose, the method of mental mapping is used. In the second step, statistical methods are used to evaluate the spatial suitability for the most common tourist activities. To obtain a holistic picture, a temporal component is included. Findings – The application of the methodology is presented in the form of a case study. The obtained research results provide an insight into the spatial situation of the city of Maribor (Slovenia, Europe). Tourist spatial identity of a city depends on time. Based on the value of spatial sensitivity indicator and the suitability of activities, it is possible to adapt the tourist offer to the temporal component. Originality/value – To the best of the authors’ knowledge, this is an original perspective on the spatial identity of tourists. The presented approach could be integrated as a good practice in any other city worldwide. It supports the identification of suitable outdoor tourist places that are memorable, cosy, multifunctional and can be recommended by city guides (mobile or printed books). Every city has many hidden gems that tourists have yet to discover
Ključne besede: urban tourism, evaluation methodology, image of the city, mental mapping, spatial identity
Objavljeno v DKUM: 12.03.2025; Ogledov: 0; Prenosov: 8
Celotno besedilo (611,33 KB)
Gradivo ima več datotek! Več...

Opis: Self-sovereign identity (SSI) is a user-centric, decentralised identity approach that provides a means for identification, authentication, and authorisation without the involvement of external entities, responsible for identity provisioning and management in current centralised and federated approaches. In general, the basic building blocks of an SSI system include decentralised identifiers, verifiable credentials, identity wallets, a verifiable data registry, and three main actors: issuer, identity holder, and verifier. Even though the SSI field is dominated by proposals, SSI systems can be implemented in different ways, which is reflected in the absence of a well-defined architecture. Thus, the best implementation is still a matter of research, the requirements of the individual system, and its field of application. However, well-designed and implemented systems are crucial to avoiding failures, speeding up the development process, ensuring high quality, and the broader adoption of SSI solutions. Hence, the main objective of this study was to identify design patterns and good practices of the SSI ecosystems by reviewing and analysing the literature, technical documentation, and existing SSI implementations. Therefore, the study is built on existing knowledge, and presents a comprehensive catalogue of thirty-five SSI design patterns that can serve as a starting point for a possible SSI system design.
Ključne besede: self-sovereign identity, decentralised identity, design patterns, decentralised identifiers, verifiable credentials, blockchain, verifiable data registry, identity wallets
Objavljeno v DKUM: 05.12.2023; Ogledov: 448; Prenosov: 82
Celotno besedilo (2,31 MB)
Gradivo ima več datotek! Več...