International Journal on Software Tools for Technology Transfer, 2001
This paper reports on the mechanical verification of the IEEE 1394 root contention protocol. This... more This paper reports on the mechanical verification of the IEEE 1394 root contention protocol. This is an industrial leader election protocol, in which timing parameters play an essential role. A manual verification of this protocol using I/O automata has been published in [24]. We improve the communication model presented in that paper. Using the Uppaal2k tool, we investigate the timing constraints on the parameters which are necessary and sufficient for correct protocol operation: by analyzing large numbers of protocol instances with different parameter values, we derive the required timing constraints. We explore the use of model checking in combination with stepwise abstraction. That is, we show that the implementation automaton correctly implements the specification via several intermediate automata, using Uppaal to prove the trace inclusion in each step.
Page 1. December 12, 1996 Carnegie Mellon University Pittsburgh, Pennsylvania 15213 Submitted in ... more Page 1. December 12, 1996 Carnegie Mellon University Pittsburgh, Pennsylvania 15213 Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the field of Robotics Thesis Committee: Takeo ...
Page 1. Clinical and Etiological Update of Myofascial Pain from Trigger Points David G. Simons SU... more Page 1. Clinical and Etiological Update of Myofascial Pain from Trigger Points David G. Simons SUMMARY. Objectives: To review clinical literature concerning the prevalence, diagnostic criteria, and treatment of myofascial trig ...
A meta-analysis of published studies was conducted to identify factors which explained variation ... more A meta-analysis of published studies was conducted to identify factors which explained variation in estimates of migraine prevalence. Twenty-four population based studies contributed a total of 168 gender and age specific estimates of migraine prevalence. In linear regression analysis, 70.6% of the variation in these prevalence estimates was explained by gender, age (AGE+AGE2), a binary variable for case definition, and an interaction term between age and the case definition. Initially, we identified five groups of case definitions among the 24 studies. Only the definition of Waters (any 2 of warning, nausea, or unilateral pain) was associated with statistically significant differences in prevalence estimates among studies; accordingly the other 4 groups were combined. Several other factors were examined as predictors of migraine prevalence including the method of selecting the study population, the source of the population, the response rate and whether diagnoses were confirmed by a clinical assessment. None of these factors substantially increased explained variance. We conclude that after taking sociodemographic factors and case definition into account, estimates of migraine prevalence are remarkably stable among studies.
International Journal on Software Tools for Technology Transfer, 2001
This paper reports on the mechanical verification of the IEEE 1394 root contention protocol. This... more This paper reports on the mechanical verification of the IEEE 1394 root contention protocol. This is an industrial leader election protocol, in which timing parameters play an essential role. A manual verification of this protocol using I/O automata has been published in [24]. We improve the communication model presented in that paper. Using the Uppaal2k tool, we investigate the timing constraints on the parameters which are necessary and sufficient for correct protocol operation: by analyzing large numbers of protocol instances with different parameter values, we derive the required timing constraints. We explore the use of model checking in combination with stepwise abstraction. That is, we show that the implementation automaton correctly implements the specification via several intermediate automata, using Uppaal to prove the trace inclusion in each step.
Page 1. December 12, 1996 Carnegie Mellon University Pittsburgh, Pennsylvania 15213 Submitted in ... more Page 1. December 12, 1996 Carnegie Mellon University Pittsburgh, Pennsylvania 15213 Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the field of Robotics Thesis Committee: Takeo ...
Page 1. Clinical and Etiological Update of Myofascial Pain from Trigger Points David G. Simons SU... more Page 1. Clinical and Etiological Update of Myofascial Pain from Trigger Points David G. Simons SUMMARY. Objectives: To review clinical literature concerning the prevalence, diagnostic criteria, and treatment of myofascial trig ...
A meta-analysis of published studies was conducted to identify factors which explained variation ... more A meta-analysis of published studies was conducted to identify factors which explained variation in estimates of migraine prevalence. Twenty-four population based studies contributed a total of 168 gender and age specific estimates of migraine prevalence. In linear regression analysis, 70.6% of the variation in these prevalence estimates was explained by gender, age (AGE+AGE2), a binary variable for case definition, and an interaction term between age and the case definition. Initially, we identified five groups of case definitions among the 24 studies. Only the definition of Waters (any 2 of warning, nausea, or unilateral pain) was associated with statistically significant differences in prevalence estimates among studies; accordingly the other 4 groups were combined. Several other factors were examined as predictors of migraine prevalence including the method of selecting the study population, the source of the population, the response rate and whether diagnoses were confirmed by a clinical assessment. None of these factors substantially increased explained variance. We conclude that after taking sociodemographic factors and case definition into account, estimates of migraine prevalence are remarkably stable among studies.
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