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ijrmet.com

IJRMET is an international peer-reviewed, electronic, online journal. The aim and scope of the journal is to provide an academic medium and an important …

tsme.org

Journal 1 Now is the time for us to push on and con thi […]

tf.llu.lv

iitf piedāvā bakalaura, maģistra un doktora studiju programmas dabaszinātņu, inženierzinātņu, tehnoloģiju un it jomās.

ije.ir

This study addresses Vehicle Routing Problem with Simultaneous Pickup and Delivery (VRPSPD) under uncertainty and environmental constraints, reflecting the complexity of real-world logistics systems. Each customer requires both pickup and delivery services, neglecting time-dependent traffic conditions and demand uncertainty can lead to inefficient routing decisions. A robust mixed-integer linear programming is proposed to address the issues, which combines the fuzzy representations of demand and time-dependent travel times to increase the realism of the solution. In this research, a linear piecewise function whose slopes are greater than -1 is employed to ensure the First-In-First-Out (FIFO) property in travel time estimation. The primary objective of the proposed model is to minimize overall service time for customers, while accounting for the impact of time-sensitive traffic and environmental conditions. This approach also supports sustainability objectives by reducing carbon emissions. Given the NP-hard nature of the problem, a Variable Neighborhood Search (VNS) algorithm is utilized to efficiently solve the model. This proposed algorithm is validated through extensive computational experiments on small-, medium-, and large-scale instances. The results demonstrate that the proposed approach can significantly reduce service time and carbon emissions compared to existing methods, highlighting its effectiveness and relevance in the context of sustainable vehicle routing under uncertainty.

scs-europe.net

european council for modelling and simulation

zndxzk.com.cn

中南大学学报（自然科学版、英文版）官方网站。中南大学学报（自然科学版、英文版）是中南大学主办的以材料、冶金、选矿、化学化工、机电、信息、地质、采矿、土木等专业学科为主的科技期刊。先后荣获首届国家期刊奖、第二届国家期刊奖提名奖、第三届国家期刊奖百种重点期刊等、全国高校科技期刊评比一等奖、全国优秀科技期刊评比一等奖、全国高校优秀自然科学学报评比一等奖、首届中国高校精品科技期刊奖等，被评为百种中国杰出学术期刊。

gerb.com

Our customers demand absolute reliability, quality, and safety. In order to meet these demands, we have developed a comprehensive management system for quality assurance, environment protection, and health and safety.