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Design of water supply networks for water transfer to the urban area Case study : Balikpapan city

Huy Dinh T.N., Dwijendra Ngakan K.A., Poltarykhin Andrey, Suksatan Wanich, Nahi Nooraldeen S., Mahmudiono Trias, Hai Nguyen T., Kadhim Mustafa M., Singh Krishanveer, Ahmed Alim A.A.

Journal of Water and Land Development

2022

no. 54

251--254

The growing population and the development of industries in all countries of the world have created a very important and complex issue for water supply to cities. Today, many parts of the world are facing the problem of water shortage and this problem cannot be easily solved. In addition to the proper use of water resources and preventing the loss of natural water, the establishment of regional water supply networks is effective in meeting the future needs of the people. A water distribution network (water supply network) is a set of interconnected pipelines used to transport and distribute water in a complex. In designing the water distribution network, factors such as the type of water distribution network, water pressure, water velocity, design flow, minimum pipe diameter, pipe material and many other factors should be considered. In this study, we have tried to design the water supply network of a part of Balikpapan city in Indonesia. The design method led to the determination of pressure values in the connection nodes, pipe diameters, flow rate and velocity in the pipes. All the existing criteria are considered in the design of the water supply network. Although this study has been implemented for a specific study area, it can be of great help to designers in designing the water supply network.

Optimizing the interaction between two closed-loop supply chains based on inverse logistics using the game theory method

Trung Nguyen Dinh, Huy Dinh Tran Ngoc, Chetthamrongchai Paitoon, Mohsen Karrar Shareef, Iskandar Ahmad Syarief, Nurjaya A., Sunarsi Denok, Singh Krishanveer, Chupradit Supat

Foundations of Computing and Decision Sciences

2022

Vol. 47, No. 4

455--467

Over the past few years, attention to environmental problems, legal necessities, and economic advantages emerging from reproduction activities has attracted attention to reverse logistics activities in the form of a closed-loop supply chain, whether in industry or scientific research. The current study aims to model competitiveness and comparison between two closed-loop three-level supply chains, each of which includes a manufacturer, a retailer, and a third party to collect the products used by the customer, taking into account the concepts of game theory and the existence of aggregates. Moreover, a separate supplier for each chain is considered. In the forward supply chain, the manufacturer produces new products using new components or re-used products that have been collected from the consumer, then sells these products mainly to the retailer, and the retailer sells them. In the reverse chain, the collector provides the used products to the manufacturer after collection. The study utilized the definitions and concepts of game theory to model this closed loop chain as a Stackelberg game to obtain the optimal value of wholesale and retail price and the optimal value of the product return coefficient for the collector. Finally, the models based on some numerical examples are solved. Given the results, the remanufacturing costs have a significant role in making more profits for all members in such chains, and competitive chains should attempt to remanufacture the products at lower costs.