System safety model and simulation based on entity-oriented event sequence diagram

Author(s):  
Jian Jiao ◽  
Tingdi Zhao
2013 ◽  
Vol 127 (9) ◽  
pp. 924-926 ◽  
Author(s):  
J Duodu ◽  
T H J Lesser

AbstractBackground:The surgical trainee has to acquire surgical skills in an era of reduced training hours and greater demands for efficient use of operating theatre time. Many surgical specialties are utilising model and simulation-based training to provide safe, low-pressure training opportunities for today's trainee.Method and results:This paper describes a simple, relatively inexpensive tonsillectomy model that enables the practice of tonsil removal and ligation of bleeding vessels. The model is beneficial for the patient, trainee and trainer.Conclusion:The pseudo mouth and active bleeding components of this model provide the trainee with a relatively inexpensive, realistic model with which to gain confidence and competence in the skill of ligating tonsillar blood vessels with a tonsil tie.


2011 ◽  
Vol 96 (1) ◽  
pp. 38-52 ◽  
Author(s):  
David Navarre ◽  
Philippe Palanque ◽  
Eric Barboni ◽  
Jean-François Ladry ◽  
Célia Martinie

2019 ◽  
Vol 3 (3) ◽  
pp. 47
Author(s):  
Johannes Kroß ◽  
Helmut Krcmar

Evaluating and predicting the performance of big data applications are required to efficiently size capacities and manage operations. Gaining profound insights into the system architecture, dependencies of components, resource demands, and configurations cause difficulties to engineers. To address these challenges, this paper presents an approach to automatically extract and transform system specifications to predict the performance of applications. It consists of three components. First, a system-and tool-agnostic domain-specific language (DSL) allows the modeling of performance-relevant factors of big data applications, computing resources, and data workload. Second, DSL instances are automatically extracted from monitored measurements of Apache Spark and Apache Hadoop (i.e., YARN and HDFS) systems. Third, these instances are transformed to model- and simulation-based performance evaluation tools to allow predictions. By adapting DSL instances, our approach enables engineers to predict the performance of applications for different scenarios such as changing data input and resources. We evaluate our approach by predicting the performance of linear regression and random forest applications of the HiBench benchmark suite. Simulation results of adjusted DSL instances compared to measurement results show accurate predictions errors below 15% based upon averages for response times and resource utilization.


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