Modelling dynamic dependencies by functional database model

نویسندگان

  • Iztok Savnik
  • Tomaz Mohoric
  • Tomi Dolenc
  • Franc Novak
چکیده

The database model CDM intended for modelling design objects is presented. All properties of design objects are modelled by functions. For modelling dynamic dependencies among objects we introduce the notion of dynamic function. The dynamic function comprises capabilities for the description of the object static structure and algorithmic dependencies among objects. Some constraints and practical problems in using dynamic functions in the domain of geometric modelling are identiied.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Options for Modelling Temporal Statistical Dependencies in an Acoustic Model for ASR

In this paper we consider the combination of hidden Markov models based on Gaussian mixture densities (GMM-HMM) and linear dynamic models (LDM) as the acoustic model for automatic speech recognition systems. In doing so, the individual strengths of both models, i.e. the modelling of long-term temporal dependencies by the GMM-HMM and the direct modelling of statistical dependencies between conse...

متن کامل

Permanence and Uniformly Asymptotic Stability of Almost Periodic Positive Solutions for a Dynamic Commensalism Model on Time Scales

In this paper, we study dynamic commensalism model with nonmonotic functional response, density dependent birth rates on time scales and derive sufficient conditions for the permanence. We also establish the existence and uniform asymptotic stability of unique almost periodic positive solution of the model by using Lyapunov functional method.

متن کامل

Functional Dependencies for Object Databases

There is an increasing use of object oriented methods (e.g. [Ru91], [UML97]) for the design of database applications and databases themselves. Like the Entity–Relationship model and its variants, structural models of these methods provide rich modelling concepts for specifying object schemas. Some kinds of integrity constraints, e.g. referential integrity constraints or cardinality constraints ...

متن کامل

Temporal Dependencies

Static integrity constraints involve only the current database state. Temporal integrity constraints involve current, past, and future database states; they can be expressed by essentially unrestricted sentences in temporal logic. Certain syntactically restricted classes of temporal constraints have been studied in their own right for considerations of feasibility or practicality; they are usua...

متن کامل

Dynamic Discovery of Fuzzy Functional Dependencies Using Partitions

A functional dependency describes the relationship between attributes in a database relation. It states that the value of an attribute is uniquely determined by the values of some other attributes. It serves as a constraint between the attributes and is being used in the normalization process of relational database design. Therefore the discovery of functional dependencies from databases has be...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • Microprocessing and Microprogramming

دوره 37  شماره 

صفحات  -

تاریخ انتشار 1993