Methods Inf Med - Large-scale performance evaluation of e-homecare architectures using the WS-NS simulator.

Tópicos

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Resumo

CKGROUND: E-homecare creates opportunities to provide care faster, at lower cost and higher levels of convenience for patients. As e-homecare services are time-critical, stringent requirements are imposed in terms of total response time and reliability, this way requiring a characterization of their network load and usage behavior. However, it is usually hard to build testbeds on a realistic scale in order to evaluate large-scale e-homecare applications.OBJECTIVE: This paper describes the design and evaluation of the Network Simulator for Web Services (WS-NS), an NS2-based simulator capable of accurately modeling service-oriented architectures that can be used to evaluate the performance of e-homecare architectures.METHODS: WS-NS is applied to the Coplintho e-homecare use case, based on the results of the field trial prototype which targeted diabetes and multiple sclerosis patients. Network-unaware and network-aware service selection algorithms are presented and their performance is tested.RESULTS: The results show that when selecting a service to execute the request, suboptimal decisions can be made when selection is solely based on the service's properties and status. Taking into account the network links interconnecting the services leads to better selection strategies. Based on the results, the e-homecare broker design is optimized from a centralized design to a hierarchical region-based design, resulting in an important decrease of average response times.CONCLUSIONS: The WS-NS simulator can be used to analyze the load and response times of large-scale e-homecare architectures. An optimization of the e-homecare architecture of the Coplintho project resulted in optimized network overhead and more than 45% lower response times.

Resumo Limpo

ckground ehomecar creat opportun provid care faster lower cost higher level conveni patient ehomecar servic timecrit stringent requir impos term total respons time reliabl way requir character network load usag behavior howev usual hard build testb realist scale order evalu largescal ehomecar applicationsobject paper describ design evalu network simul web servic wsns nsbase simul capabl accur model serviceori architectur can use evalu perform ehomecar architecturesmethod wsns appli coplintho ehomecar use case base result field trial prototyp target diabet multipl sclerosi patient networkunawar networkawar servic select algorithm present perform testedresult result show select servic execut request suboptim decis can made select sole base servic properti status take account network link interconnect servic lead better select strategi base result ehomecar broker design optim central design hierarch regionbas design result import decreas averag respons timesconclus wsns simul can use analyz load respons time largescal ehomecar architectur optim ehomecar architectur coplintho project result optim network overhead lower respons time

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