scholarly journals MODEL-DRIVEN CLOCK FREQUENCY SCALING FOR CONTROL-DOMINATED EMBEDDED SYSTEMS

2014 ◽  
pp. 100-107
Author(s):  
Zdravko Karakehayov
Keyword(s):  
Power Management ◽  
Rate Control ◽  
Power Saving ◽  
Clock Frequency ◽  
Frequency Scaling ◽  
Clock Rate ◽  
Battery Lifetime ◽  
Model Driven ◽  
Optimal Value

This paper introduces a combination of models and proofs for optimal power management via clock frequency scaling. The approach is suitable for systems on a chip or microcontrollers where a processor runs in parallel with embedded peripherals. Since the methodology is based on clock rate control, it is very easy to implement. A hardware model, a computational model and an energy model underlie the procedure. We proved that the combination of models is sufficient to determine an optimal clock rate for the CPU. Furthermore, we expand the application space taking into account preemption of tasks. Also, we discuss the role of embedded peripherals when select the clock frequency in both active and power-saving modes. Simulation results manifest the benefits of clock rate control under the proposed methodology. An example shows a 56% increase of the battery lifetime when the clock rate is changed from the lowest possible level to the optimal value.

scholarly journals Welfare optimization and multinational monopolies

1996 ◽  
Vol 38 (1) ◽  
pp. 16-25
Author(s):  
A. M. Russell ◽  
C. A. Martini ◽  
J. A. Rickard
Keyword(s):  
Parameter Space ◽  
Home Country ◽  
Domestic Market ◽  
Consumption Tax ◽  
Optimal Value ◽  
National Welfare ◽  
Consumption Taxes

AbstractThis paper examines the role of import tariffs and consumption taxes when a product is supplied to a domestic market by a foreign monopoly via a subsidiary. It is assumed that there is no competition in the domestic market from internal suppliers. The home country is able to levy a profits tax on the subsidiary. The objective of our analysis is to determine the mix of tariff and consumption tax which simultaneously maximizes national welfare. We show that national welfare does not have an internal maximum, but attains its maximum on a boundary of the consumption tax–tariff parameter space. Furthermore, the optimal value of national welfare increases as the tariff decreases and the consumption tax increases. The results obtained generalize the results of an earlier paper in which national welfare was maximized with respect to either a tariff or consumption tax, but not both.

scholarly journals PROGNOSTIC ROLE OF ATRIAL FIBRILLATION AND HEART RATE CONTROL IN CHRONIC HEART FAILURE PATIENTS

2013 ◽  
Vol 61 (10) ◽  
pp. E735
Author(s):  
Savina Nodari ◽  
Marco Triggiani ◽  
Laura Lupi ◽  
Alessandra Manerba ◽  
Giuseppe Milesi ◽  
...  
Keyword(s):  
Heart Failure ◽  
Atrial Fibrillation ◽  
Heart Rate ◽  
Chronic Heart Failure ◽  
Rate Control ◽  
Heart Rate Control ◽  
Prognostic Role ◽  
Heart Failure Patients

Effectiveness of DFS Tuning on Java Server Workload

2015 ◽  
Vol 25 (01) ◽  
pp. 1640005 ◽  
Author(s):  
Hitoshi Oi
Keyword(s):  
Power Consumption ◽  
Sampling Period ◽  
Threshold Level ◽  
Load Level ◽  
Clock Frequency ◽  
Frequency Scaling ◽  
Dynamic Frequency Scaling ◽  
Maximum Reduction ◽  
Dynamic Frequency

Dynamic frequency scaling (DFS) is a feature commonly found in modern processors. It lowers the clock frequency of a core according to the load level and reduces the power consumption. In this paper, we present a case study of tuning DFS parameters on a platform with an AMD Phenom II X6 using the SPECjEnterprise2010 (jEnt10) and SPECjbb2005 (jbb05) as the workload. In jEnt10, a longer sampling period of core utilization (up to 1.5[Formula: see text]s) reduced the power by 6[Formula: see text]Watt at 25% load level. At 50% load level, combining it with an increased threshold level (98%) to switch the clock frequency further reduced the power consumption by up to 10[Formula: see text]Watt. In jbb05, stretching the sampling period was only effective up to 0.5[Formula: see text]s. The maximum reduction was observed at around 60% load level. Raising the threshold level was not effective for jbb05.

Is Modeling a Treatment for the Weakness of Software Engineering?

2017 ◽  
pp. 1977-1994
Author(s):  
Janis Osis ◽  
Erika Asnina
Keyword(s):  
Software Engineering ◽  
Software Development ◽  
Mathematical Formalism ◽  
Separation Of Concerns ◽  
Model Driven ◽  
Topological Modeling ◽  
System Functioning ◽  
Mathematical Accuracy ◽  
The Way

Experts' opinions exist that the way software is built is primitive. The role of modeling as a treatment for Software Engineering (SE) became more important after the appearance of Model-Driven Architecture (MDA). The main advantage of MDA is architectural separation of concerns that showed the necessity of modeling and opened the way for Software Development (SD) to become engineering. However, this principle does not demonstrate its whole potential power in practice, because of a lack of mathematical accuracy in the initial steps of SD. The question about the sufficiency of modeling in SD is still open. The authors believe that SD, in general, and modeling, in particular, based on mathematical formalism in all its stages together with the implemented principle of architectural separation of concerns can become an important part of SE in its real sense. They introduce such mathematical formalism by means of topological modeling of system functioning.

Is Modeling a Treatment for the Weakness of Software Engineering?

2018 ◽  
pp. 310-327
Author(s):  
Janis Osis ◽  
Erika Asnina
Keyword(s):  
Software Engineering ◽  
Software Development ◽  
Mathematical Formalism ◽  
Separation Of Concerns ◽  
Model Driven ◽  
Topological Modeling ◽  
System Functioning ◽  
Mathematical Accuracy ◽  
The Way

Experts' opinions exist that the way software is built is primitive. The role of modeling as a treatment for Software Engineering (SE) became more important after the appearance of Model-Driven Architecture (MDA). The main advantage of MDA is architectural separation of concerns that showed the necessity of modeling and opened the way for Software Development (SD) to become engineering. However, this principle does not demonstrate its whole potential power in practice, because of a lack of mathematical accuracy in the initial steps of SD. The question about the sufficiency of modeling in SD is still open. The authors believe that SD, in general, and modeling, in particular, based on mathematical formalism in all its stages together with the implemented principle of architectural separation of concerns can become an important part of SE in its real sense. They introduce such mathematical formalism by means of topological modeling of system functioning.

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