  The increasing importance of such fields as embedded systems, pervasive
computing, and hybrid systems control is increasing attention to the
time-dependent aspects of system modeling. In this paper, we focus on modeling
conceptual time. Conceptual time is time represented in conceptual modeling,
where the notion of time does not always play a major role. Time modeling in
computing is far from exhibiting a unified and comprehensive framework, and is
often handled in an ad hoc manner. This paper contributes to the establishment
of a broader understanding of time in conceptual modeling based on a software
and system engineering model denoted thinging machine (TM). TM modeling is
founded on a one-category ontology called a thimac (thing/machine) that is used
to elaborate the design and analysis of ontological presumptions. The issue
under study is a sample of abstract modeling domains as exemplified by time.
The goal is to provide better understanding of the TM model by supplementing it
with a conceptualization of time aspects. The results reveal new
characteristics of time and related notions such as space, events, and system
behavior.
