Mathematical Model of Supply and Demand Management

Author(s):  
Alexander V. Bratishchev ◽  
Galina A. Batishcheva ◽  
Maria I. Zhuravleva ◽  
Guzenko Natalia
2011 ◽  
Vol 2 (4) ◽  
pp. 288-312 ◽  
Author(s):  
Netra B. Chhetri

Planning for sustainable water management in the arid region of the southwestern USA is challenging mostly due to only partial understanding of factors converging around water supply and demand. Some of the factors that prompt concern about the adequacy of water resources are: (a) a growing urban population seeking a range of services, including the need to preserve and enhance aquatic ecosystems; (b) dwindling water storage due to multi-year drought conditions; and (c) the prospect of human-induced climate changes and its consequences in the hydrologic system of the region. This study analyzes the potential for water saving in the Phoenix Active Management Area (AMA) of Central Arizona, which includes the city of Phoenix, one of the fastest growing metropolitan areas in the country. Based on an extensive literature review and secondary data analysis, this paper investigates multiple factors that place increasing strain on current water resources, and attempts to extend this analysis to 2025. Outdoor water use within the residential landscape is the most important factor that strains water resources in Phoenix AMA. Any gain in efficiency through agricultural water demand management would not only improve the availability of water for other uses in the AMA, but would facilitate adaptation of the agricultural system to climate and other ongoing changes.


Author(s):  
Georgy Kolesnik

High competition in the markets of goods and services makes it urgent to improve the efficiencyof the use of production assets by the enterprises. One of the possible ways to solve the problem is joint use of the assets by different subjects. The use of this mechanism in the various branches grows rapidly in the last decade due to the opportunities for aggregation of supply and demand and automated contracting provided by the modern digital technologies. The basis for production asset management systems based on sharing is a mathematical model that allows determining the optimal modes of asset use in terms of their utilization, reducing the total cost of ownership and obtaining additional operating profit. This article considers a mathematical model of a multi-product spatially distributed production system that reflects the features of the activities of machine-building enterprises and assumes the possibility of joint use of their fixed assets. Economic and social criteria for the efficiency of fixed assets sharing are formulated in terms of maximizing the profit of enterprises, minimizing logistics and downtime costs. The optimal modes of joint use of the fixed assets concerning these criteria are investigated. It is shown that the joint use of fixed assets under the certain conditions can significantly improve the efficiency of the operating activities of enterprises.


Water Policy ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 193-210
Author(s):  
Zachary Bischoff-Mattson ◽  
Gillian Maree ◽  
Coleen Vogel ◽  
Amanda Lynch ◽  
David Olivier ◽  
...  

Abstract The interruption of essential water services in Cape Town, foreshadowed as ‘Day Zero,’ is one of several recent examples of urban water scarcity connected to the language of urgent climate change. Johannesburg, with its larger and growing population and deeply enmeshed water and power infrastructures, is currently regarded as one drought away from disaster. As a result, the lessons to be learned from Cape Town are under active debate in South Africa. We used Q method to examine the structure of perspectives on urban water scarcity among South African water management practitioners. Our results illustrate distinct viewpoints differentiated by focus on corruption and politics, supply and demand systems, and social justice concerns as well as a distinct cohort of pragmatic optimists. Our analysis underscores the significance of public trust and institutional effectiveness, regardless of otherwise sound policy or infrastructure tools. As practitioners explicitly connect domains of competency to solvable and critical problems, integrated systems approaches will require deliberate interventions. Furthermore, urban water crises exacerbate and are exacerbated by existing experiences of racial and economic inequality, but this effect is masked by focus on demand management of average per capita water consumption and characterization of water scarcity as ‘the new normal.’


2014 ◽  
Vol 513-517 ◽  
pp. 3160-3164
Author(s):  
Xue Li Zhang

Traffic congestion are prevalent in worldwide cities. The imbalance between demand and supply of urban traffic is the root cause of this problem. So taking effective measures to regulate traffic demand, and guiding the traffic problems of the supply and demand balance is the best way to solve traffic congestion. This paper improves the TDM measure, and combines with intelligent information platform for the design of a new urban transport demand management adaptability of dynamic traffic data analysis platform. The platform supported by the technology of wireless sensor communications, intelligent terminals, the Internet and cloud computing is facing with the dynamic needs of traffic flow and traffic congestion state to carry out the operations of spatiotemporal data mining, clustering, and track detection, and to apply it into the traffic hot spots, abnormal driving track, traffic congestion trends and traffic flow detection and analysis, which has a good reference value for the improvement of management and service level of traffic intelligent systems.


Sign in / Sign up

Export Citation Format

Share Document