Ydinmalli

Ydinmalli is a Finnish term that can denote a central or core modeling concept used in different disciplines. In physics it refers to models of the atomic nucleus, while in information technology and systems engineering it denotes a core schema or domain model that captures the essential elements of a system or domain.

In nuclear physics, ydinmalli describes the structure and behavior of the atomic nucleus using frameworks such as the shell model, the liquid-drop model, and various collective models. These approaches aim to explain properties like binding energy, magic numbers, nuclear spin, and deformation. Nuclear models are approximations based on nucleon-nucleon interactions and are refined through experimental data from spectroscopy, decays, and reaction studies.

In software engineering and enterprise architecture, ydinmalli means a core model that abstracts the essential entities and relationships of a domain, separating core elements from extensions. A core model supports reuse, interoperability, and coordinated design across products or systems. It is typically developed through domain analysis, stakeholder input, and iterative refinement, and can be expressed as ontologies, canonical data schemas, or UML-style diagrams. Core models underpin approaches such as domain-driven design and product line engineering.

Examples include a nuclear ydinmalli describing basic configurations of nucleons, and a business ydinmalli defining core concepts like Customer, Product, and Order with their relationships. Limitations include potential oversimplification and the need for ongoing governance and adaptation as new data or requirements emerge.

See also Nuclear model, Shell model, Liquid-drop model, Domain-driven design, Ontology, Reference architecture.