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Düchting, Werner; Vogelsaenger, Thomas
doi: 10.1177/003754978304000503pmid: N/A
A new three-dimensional model of tumor growth and treatment includes (1) models of the life cycles of normal cells and tumor cells, (2) cell-cell interaction and production rules, and (3) algorithms that account for different avenues of tumor treat ment. Illustrative examples show the simulation of tumor growth and treatment by chemotherapy. The model could make it possible to optimize treatment schedules using computer simulation prior to clinical therapy.
doi: 10.1177/003754978304000504pmid: N/A
New digital flight control systems require the analyst to sim ulate digital processes in system performance studies. One way to do this is by processing the digital elements only at their up date times. They interact with the continuous elements via sampling and output operations. The analyst can then model digital control within a familiar simulation framework. A control system for a fighter aircraft serves as an illustrative example.
doi: 10.1177/003754978304000505pmid: N/A
Existing general purpose simulation software is not adequate for studying large, flexible spacecraft with digital controllers because it will not accept sampled-data equations or link to state-of-the-art structural modeling software. The MODEL S sim ulation language was developed to handle the first of these problems. It will accept mathematical models involving both differential equations and sampled-data equations. Computa tional delays can also be included. This makes MODEL S useful for the simulation of many digital controllers. Simple examples and an actual spacecraft controller show the language's power, flexibility, and ease of use. Planned enhancements include multirate sampling capability, software mode control and event sensing, and linkage to complex plant models.
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