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Research on Integrated Optimization of the Reverse Logistics Network
Yuming Luo 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.7
Considered the integrate of forward and reverse logistics, the separability of recycle products, the timeliness of recycle products, the paper established a location-routing-inventory control optimization model with batch transportation of recycle products. A matching hybrid genetic algorithm containing heuristic rule was introduced according the characteristics above. The algorithm used three-stage real-code that represents the transport order of vehicles. And the quantity of new products and recycle products will be determined too. The unreasonable solution will be eliminated in the iterative process of genetic algorithm. The simulated test analysis shows the validity and the correctness of the model and algorithm.
Research on Prediction of Reverse Returned Logistics Based on Grey-Markov Model
Yuming Luo 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.8
In order to improve the prediction accuracy of reverse returned logistics, considering it has the characteristics of high volatility and uncertainty, the paper used the theory of Markov Chain to modify the result of Grey prediction. And a Grey-Markov prediction model was established. Several parallel region has been divided used the prediction curve of Grey prediction model as symmetric center. And each region was a state interval. A practical example show that the average relative error rate and the variance ratio of Grey-Markov prediction model was smaller, and the prediction accuracy is higher comparing with the Grey prediction model. The model is effective and feasible.
Luyao Wang,Ning Wang,Dandan Mi,Yuming Luo,Jianhua Guo 한국미생물학회 2017 The journal of microbiology Vol.55 No.7
In this study, we investigate the relationship between γ-PGA productivity and biocontrol capacity of Bacillus subtilis BsE1; one bacterial isolate displayed 62.14% biocontrol efficacy against Fusarium root rot. The γ-PGA yield assay, motility assay, wheat root colonization assay, and biological control assay were analysed in different γ-PGA yield mutants of BsE1. The pgsB (PGA-synthase-CapB gene) deleted mutant of BsE1 reduced γ-PGA yield and exhibited apparent decline of in vitro motile ability. Deletion of pgsB impaired colonizing capacity of BsE1 on wheat root in 30 days, also lowered biocontrol efficacies from 62.08% (wild type BsE1) to 14.22% in greenhouse experiment against Fusarium root rot. The knockout of pgdS and ggt (genes relate to two γ-PGA degrading enzymes) on BsE1, leads to a considerable improvement in polymer yield and biocontrol efficacy, which attains higher level compared with wild type BsE1. Compared with ΔpgsB mutant, defense genes related to reactive oxygen species (ROS) and phytoalexin expressed changes by notable levels on wheat roots treated with BsE1, demonstrating the functional role γ-PGA plays in biocontrol against Fusarium root rot. γ-PGA is not only important to the motile and plant root colonization ability of BsE1, but also essential to the biological control performed by BsE1 against Fusarium root rot. Our goal in this study is to reveals a new perspective of BCAs screening on bacterial isolates, without good performance during pre-assays of antagonism ability.