Peter P. Chen

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A data model, called the entity-relationship model, is proposed. This model incorporates some of the important semantic information in the real world. A special diagramatic technique is introduced as a tool for data base design. An example of data base design and description using the model and the diagramatic technique is given. Some implications on data(More)
Recent studies have shown that the sequence and timing of mechanical activation of myocardium vary across the ventricular wall. However, the contributions of variable expression of myofilament protein isoforms in mediating the timing of myocardial activation in ventricular systole are not well understood. To assess the functional consequences of transmural(More)
In skinned myocardium, cyclic AMP-dependent protein kinase A (PKA)-catalyzed phosphorylation of cardiac myosin-binding protein C (cMyBP-C) and cardiac troponin I (cTnI) is associated with a reduction in the Ca(2+) responsiveness of myofilaments and an acceleration in the kinetics of cross-bridge cycling, although the respective contribution of these two(More)
The concept of the enterprise view of data is very useful in the database design process and in the construction of conceptual schema. This paper discusses the use of the entity-relationship approach in describing and maintaining the enterprise view of data. Fundamental operations for changing the enterprise schema are presented. Finally, an example is(More)
Storage is an important and expensive component of a computer system. Many types of storage such as semi-conductor, magnetic core, bulk core, disk, drum, tape, etc. are available today, each having different cost and physical attributes (e.g., access time). To be economical, the storage system of a modern computer generally consists of several different(More)
The current practice of graphical icon design is more an art than a science. We propose a scientific-oriented methodology for graphical icon design. It incorporates several ideas from data/system modeling and natural languages in the design and interpretation of icons. Specifically, it incorporates ideas of multileveling modeling and type-instance concepts.(More)