Switch-Hysteresis Control of the Selling Times Flow in a Model with Perishable Goods

A possibility has been tested in the paper of the feed back control of temperature of the reaction mixture in a batch reactor with an exothermic reaction through the variable area of the cooling surface. The measurement were carried out in a laboratory reactor with a retractable cooler which was being immersed into the reaction mixture. The speed of motion of the cooler was sufficiently high permitting the process of immersion to be regarded as practically instantaneous. The aim of the control was to stabilize the set point temperature of the reaction mixture by a two-point controler. In dependence on the rate of response of the system to a change of the section variable either the ideal relay or the relay with hysteresis control algorithmus were used. The results of measurements showed that with the aid of a retractable cooler the temperature could be controlled safely even in those cases, in which the control by the variable flow rate of the coolant was unfeasible. The verification was carried out in the open-loop instable operating point of the reactor.

Download Full-text

Hysteresis control of nanoelectromechanical resonator with electrothermal power

Electronics Letters ◽

10.1049/el.2014.3032 ◽

2014 ◽

Vol 50 (25) ◽

pp. 1961-1963

Author(s):

Hyong Seo Yoon ◽

Byeongho Park ◽

Seong Chan Jun

Keyword(s):

Hysteresis Control

Download Full-text

Pricing Strategies of Logistics Distribution Services for Perishable Commodities

Algorithms ◽

10.3390/a11110186 ◽

2018 ◽

Vol 11 (11) ◽

pp. 186

Author(s):

Tao Li ◽

Yan Chen ◽

Taoying Li

Keyword(s):

Dynamic Pricing ◽

Consumer Satisfaction ◽

Service Providers ◽

Time Constraints ◽

Optimal Pricing ◽

Pricing Strategies ◽

Pricing Model ◽

Logistics Service ◽

Distribution Services ◽

Perishable Goods

The problem of pricing distribution services is challenging due to the loss in value of product during its distribution process. Four logistics service pricing strategies are constructed in this study, including fixed pricing model, fixed pricing model with time constraints, dynamic pricing model, and dynamic pricing model with time constraints in combination with factors, such as the distribution time, customer satisfaction, optimal pricing, etc. By analyzing the relationship between optimal pricing and key parameters (such as the value of the decay index, the satisfaction of consumers, dispatch time, and the storage cost of the commodity), it is found that the larger the value of the attenuation coefficient, the easier the perishable goods become spoilage, which leads to lower distribution prices and impacts consumer satisfaction. Moreover, the analysis of the average profit of the logistics service providers in these four pricing models shows that the average profit in the dynamic pricing model with time constraints is better. Finally, a numerical experiment is given to support the findings.

Download Full-text

A system dynamics model for routing and scheduling of cross-dock and transportation in reverse logistics network of perishable goods

Journal of Intelligent & Fuzzy Systems ◽

10.3233/jifs-200610 ◽

2021 ◽

pp. 1-17

Author(s):

Pezhman Abbasi Tavallali ◽

Mohammad Reza Feylizadeh ◽

Atefeh Amindoust

Keyword(s):

System Dynamics ◽

Reverse Logistics ◽

Logistics Network ◽

Routing And Scheduling ◽

Perishable Goods ◽

Decision Variables ◽

Proposed Model ◽

Reverse Logistics Network ◽

The Cross ◽

Space Requirements

Cross-dock is defined as the practice of unloading goods from incoming vehicles and loading them directly into outbound vehicles. Cross-docking can simplify supply chains and help them to deliver goods to the market more swiftly and efficiently by removing or minimizing warehousing costs, space requirements, and use of inventory. Regarding the lifetime of perishable goods, their routing and scheduling in the cross-dock and transportation are of great importance. This study aims to analyze the scheduling and routing of cross-dock and transportation by System Dynamics (SD) modeling to design a reverse logistics network for the perishable goods. For this purpose, the relations between the selected variables are first specified, followed by assessing and examining the proposed model. Finally, four scenarios are developed to determine the optimal values of decision variables. The results indicate the most influencing factors on reaching the optimal status is the minimum distance between the cross-dock and destination, rather than increasing the number of manufactories.

Download Full-text