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Application of the Weibull-Poisson long-term survival model
Vigas, Valdemiro Piedade,Mazucheli, Josmar,Louzada, Francisco The Korean Statistical Society 2017 Communications for statistical applications and me Vol.24 No.4
In this paper, we proposed a new long-term lifetime distribution with four parameters inserted in a risk competitive scenario with decreasing, increasing and unimodal hazard rate functions, namely the Weibull-Poisson long-term distribution. This new distribution arises from a scenario of competitive latent risk, in which the lifetime associated to the particular risk is not observable, and where only the minimum lifetime value among all risks is noticed in a long-term context. However, it can also be used in any other situation as long as it fits the data well. The Weibull-Poisson long-term distribution is presented as a particular case for the new exponential-Poisson long-term distribution and Weibull long-term distribution. The properties of the proposed distribution were discussed, including its probability density, survival and hazard functions and explicit algebraic formulas for its order statistics. Assuming censored data, we considered the maximum likelihood approach for parameter estimation. For different parameter settings, sample sizes, and censoring percentages various simulation studies were performed to study the mean square error of the maximum likelihood estimative, and compare the performance of the model proposed with the particular cases. The selection criteria Akaike information criterion, Bayesian information criterion, and likelihood ratio test were used for the model selection. The relevance of the approach was illustrated on two real datasets of where the new model was compared with its particular cases observing its potential and competitiveness.
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Broadcast Message Dissemination Schemes for Urban Environments : a Survey
Julio A. Sanguesa,Manuel Fogue,Piedad Garrido,Francisco J. Martinez,Juan-Carlos Cano,Carlos T. Calafate 한국산업정보학회 2014 한국산업정보학회 학술대회논문집 Vol.2014 No.1
In VANKT traffic safety applications, efficient warning message dissemination is required. The main goal is to reduce the latency while ensuring the correct reception of warning information by nearby vehicles when a dangerous situation occurs. So far, several dissemination schemes have been proposed and evaluated under different conditions, and using different simulators, making it difficult to determine which is the optimal dissemination scheme. In this paper, we assess the performance of several existing broadcast dissemination schemes by evaluating them under the same conditions, and focusing on the same metrics, thus providing researchers with a general overview of the drawbacks and benefits associated to each scheme.
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