79results about How to "Reduce rental costs" patented technology

The invention relates to the field of mobile Internet e-commerce and discloses an intelligent business system based on localization. The intelligent business system based on localization achieves the purposes of localized purchase of consumers and efficient operation of merchants. The intelligent business system based on localization comprises an intelligent business platform (business platform for short) based on cloud computing, and an intelligent terminal application (terminal application for short) based on location-based services. The business platform is the core of the whole system and is used for providing information management and trading management of commodities, business data mining and business process management. The terminal application enables a user to have access to the intelligent business system anytime and anywhere, provides commodity inquiry and trading services for the consumers based on user locations and provides shop management, consumer data mining and intelligent marketing services for the merchants. The intelligent business system aims at providing convenience for purchasing of local life of the consumers, reducing operating cost for the local merchants, improving the marketing efficiency and enabling the consumers and the local merchants to be mutually benefited and win.

The invention provides a large-scale chart-shaped data processing task scheduling method for resource cost driving under cloud computing environment and belongs to the field of distributed computing. The method comprises the following steps of: 1, reading in a large-scale chart-shaped data processing task chart, traversing the large-scale chart-shaped data processing task chart according to hierarchical relationship of chart-shaped structure tasks, performing task serial number marking according to hierarchy and computing the total number n of the tasks; 2, reading in the performance and valuation mode of a virtual machine under the current cloud computing environment; 3, initializing codes of m particles as well as the positions Xi and flying speeds Vi of the particles, and setting the maximal number of iterations as T; 4, computing fitness functional values f(Xi) of all the particles by utilizing a lower fitness function according to the current codes of the particles; and 5, performing speed updating and position updating according to the fitness functional values of the particles.

The embodiment of the invention discloses a data transmission method, device and a storage medium, aiming at optimizing a transmission link and greatly reducing the bandwidth rental cost and the operation and maintenance cost. The method disclosed by the embodiment of the invention is applied to the data transmission device, the device comprises multiple buffering queues, and different buffering queues have different priorities in processing services. The method comprises the following steps: when data messages reach a network card, determining service types of data streams in the data messages; distributing the data messages to the corresponding buffering queues according to the service types of the data streams, wherein different service types correspond to the different buffering queues; and transmitting the data messages in the multiple buffering queues according to the priorities of the buffering queues.

The invention discloses a self-service sharing cooking device. The device comprises a refrigerating unit, a meal ordering unit, and a cooking unit. The refrigerating unit is used for refrigerating a meal box, and is provided with a sensing module for identifying a label arranged on the meal box. The meal ordering unit is provided with a two-dimensional code and a central control module. A user scans the two-dimensional code by a mobile terminal to connect the mobile terminal with the central control module. The central control module sends a meal ordering signal to the refrigerating unit to unlock the refrigerating unit. The sensing module identifies the category and the quantity of the removed meal box, and transmits an identified signal to the central control module. The central controlmodule generates a bill and sends an automatic deduction signal to the mobile terminal. The cooking unit is used for receiving billing information of the central control module and acquiring matched recipe information according to the billing information. The cooking unit cooks the meal box according to the acquired recipe information. The invention further discloses a self-service sharing cookingmethod. The self-service sharing cooking device and method have a wide range of uses, the high use efficiency, and the low use cost.

The invention relates to a self- propulsion type concrete mixing ship. In the invention, the front part of an inner cabin of a deep-cabin cargo ship is provided with an aggregate bin, and the back side of the aggregate bin is provided with a grappling bucket hanger; the middle part of the inner bin of the deep-cabin cargo ship is provided with a proportioning machine, a water storage tank, a concrete stirrer, a water reducing agent tank and a concrete transportation pump; and the back part of the inner bin of the deep-cabin cargo ship is provided with an integral type steel sealed filler bin, a discharge port at the bottom of the steel sealed filler bin is connected with a feeding mechanism of a first spiral conveyer, a discharge pipe at the back end of the first spiral conveyer is connected with a feed pipe at the front end of a second spiral conveyer, and a discharge pipe at the back end of the second spiral conveyer is positioned above a measuring hopper at the top part of the concrete stirrer. The invention reasonably arranges various kinds of concrete mixing equipment in the deep-cabin cargo ship, is an integrative self-propelled type mixing ship integrating the storage, the metering, the transportation, the stirring and the pumping of raw materials, such as aggregates, powder, water, an admixture and the like, can meet the basic requirement that stock preparation of one time can pour for large square quantity, and has the characteristics of overwater maneuvering flexibility, independent voyage, quick positioning, large production capacity of concrete, good stability, low cost input and the like.

The invention provides a cloud computation environment based method saving bandwidth resource renting cost. The method includes steps of 1, acquiring history flow data; 2, using an ARIMA model for predicating the mean value and the standard difference of the flow of the next moment according to the history flow data; 3, according the mean value and the standard different of the flow of the next moment, determining the bandwidth value required to be rent for the next time. According to the invention, in the premise of ensuring a specific service quality index, resource utilization rate is improved effectively and bandwidth resource renting cost is reduced.

The invention discloses an installation device of a prefabricated bridge deck, which belongs to the field of bridge construction. The installation device comprises two longitudinal slide-way beams which are symmetrically and fixedly distributed on a top overhanging eave of a steel box beam in parallel, two transverse bearing beams which stretch across the two longitudinal slide-way beams and symmetrically arranged on the two longitudinal slide-way beams in parallel as well as two parallel symmetric longitudinal bearing beams which stretch across the two transverse bearing beams, wherein each longitudinal slide-way beam is respectively provided with a carrying tank and a limiting distribution device which is used for supporting the transverse bearing beam to slide back and forth along the longitudinal direction, each longitudinal slide-way beam is also provided with a gallows, and the gallows is connected to the limiting distribution device through a traction rope and pulls the carrying tank to slide on the longitudinal slide-way beam. The installation device can solve the problem that the prefabricated bridge deck is subjected to the limitation of the installation terrain and is safe to use, convenient and high-efficient to operate and easy to control.

The present invention provides a communication system comprising a first communication apparatus and a second communication apparatus, wherein the first communication apparatus has rental-request-information-generating means for generating rental-request information, and transmitting means for transmitting the rental-request information generated by the rental-request-information-generating means, and the second communication apparatus has receiving means for receiving the rental-request information transmitted by the transmitting means, and recording means for recording a rental date of transmission of a rented storage medium for storing data in advance to a delivery destination and a return date of returning the rented storage medium from the delivery destination in accordance with the rental-request information received by the receiving means.

An embodiment of the invention discloses a portable power supply return management method, a cloud server and a management system. The method includes the steps: determining position information of a target site; receiving a portable power supply return request transmitted by a user client; acquiring rental time and return time of a portable power supply to be returned according to the return request; calculating use time of the portable power supply to be returned according to the rental time and the return time; calculating rental expense needing to be paid by the user client according to the use time, and calculating expense obtained by a portable power supply rental station manager according to a preset division rule and the rental expense needing to be paid by the user client. A user can conveniently and timely return the rented portable power supply, and the rental cost of the user is reduced. Besides, in the return management process of the portable power supply, benefits generated by rental can be more reasonably distributed.

The invention discloses an item renting control method. The item renting control method comprises the following steps: receiving an item renting request, and acquiring item information corresponding to the item renting request; controlling to display the item information on an item renting interface so as to enable users to select corresponding items to rent; and receiving a selection instruction,and controlling item storage equipment to open a bin gate of items corresponding to the selection instruction, so as to enable the users to take out the items for use. The invention further disclosesa terminal and a computer-readable storage medium. The technical problems in the current item renting manner that the renting service rationality and effect are poor and the renting cost is high areeffectively solved. The item renting service management rationality and effect are improved, and the renting cost is reduced.

The invention discloses a resource dynamic scheduling method for a Web application in a cloud computing environment. Dynamic change of a user request, time delay requirements of the application, heterogeneity of cloud resources, price fluctuation of bidding examples and the like are considered. The method comprises the following steps: A) determining an optimal resource quantity based on load prediction and application delay requirements; B) selecting a bidding type with the lowest cost based on bidding instance price prediction; and C) adopting pre-leasing to reduce time delay increase causedby resource requests and creation. The method is mainly characterized by comprising the steps that A, prediction loads serve as the arrival rate of a queuing model, and the minimum number of virtualmachines needing to be leased is solved in combination with delay constraint of an application; The step B is mainly characterized in that a bidding type with the lowest prediction cost is selected for leasing based on price prediction; The step C is mainly characterized in that pre-leasing is carried out before a charging point arrives. According to the invention, dynamic resource scheduling is realized through load prediction, application delay constraint, price prediction and pre-leasing, and the cloud resource leasing cost can be reduced while the application performance is ensured.

The invention provides an industrial internet APP platform based on SaaS application mode and a building method thereof The method comprises the steps that a remote server side provides a subscriptable industrial Internet Web App source program, and the source program provides a subscription interface and an operation interface and can meet specific industrial application requirements; the operation interface comprises pictures and texts; the program includes a page switching program. The invention further relates to a building method of the platform. Based on the SaaS mode, the requirements of enterprises for purchasing, constructing and maintaining software infrastructures and application programs are successfully eliminated, and the development time can be greatly shortened; the platform is flexible and easy to change, enables a user to increase or decrease functions according to needs, is lower in leasing cost, and can promote the use of enterprises. The industrial APP is deployed in the cloud, and the PWA technology is combined, so that the APP manufacturing process is simpler, and the cost is low. According to the invention, industrial APP creation and maintenance services can be provided for enterprises based on websites.

The invention provides an e-commerce grid warehouse logistics system, which comprises e-commerce unit terminals and client operation terminals distributed all over the country. The e-commerce grid warehouse logistics system is characterized by further comprising a grid warehouse logistics system general server and grid warehouse logistics sub servers arranged in provinces, wherein each sub server comprises an e-commerce grid warehouse management database and a program arranged in each province; and an individual e-commerce unit terminal is connected with the grid warehouse logistics system general server and the sub servers via internet or a mobile network for data exchange. The e-commerce grid warehouse logistics system also comprises a delivery unit server distributed in each city and each town, and the delivery unit server is connected with each territorial sub server via the internet or the mobile internet for data exchange.

The invention provides a fully-automatic fully-functional vehicle washing auxiliary water spraying operation system. The fully-automatic fully-functional vehicle washing auxiliary water spraying operation system comprises a rotary spraying and washing device; the rotary spraying and washing device comprises a vehicle washing arm mounted on a main machine, and the vehicle washing arm sequentially comprises three parts of the horizontal part, the inclined part and the vertical part; at least two vehicle washing high-pressure nozzles are mounted on each of the horizontal part, the inclined part and the vertical part; three vehicle washing pumps are mounted in the main machine and correspondingly supply water for the vehicle washing high-pressure nozzles of one part of the vehicle washing arm;a prewashing fan-shaped nozzle and a foam fan-shaped nozzle are mounted on the inclined part side by side; and a prewashing pump and a foam pump are mounted in the main machine, wherein the prewashing pump supplies water for the prewashing fan-shaped nozzle, and the foam pump supplies water for the foam fan-shaped nozzle. According to the fully-automatic fully-functional vehicle washing auxiliarywater spraying operation system, energy saving and environmental protection are achieved.

The invention provides a clothing displaying and matching system. A conveyor belt in sealing connection is hung in the air, clothing of different types is hung under the conveyor belt and can move with the conveyor belt, customers are allowed to browse all exterior details of the clothing of all types, clothing can be taken at positions of lower sections of the conveyor belt to be further determined, time for the customers walking to select the clothing is saved, and meanwhile, the situation about loss of the needed clothing due to careless walking of the customers is avoided; in addition, theclothing displaying and matching system is small in space occupation, rental cost needed for large stores is saved for store owners, and profits of the clothing stores are increased; meanwhile, matching effect and related information of the clothing can be displayed through a fitting room module, and convenience and efficiency for the customers selecting the clothing are greatly facilitated.

The embodiment of the invention discloses a cloud service lease optimization method and device, equipment and a medium. The method comprises the steps of determining a network resource usage amount ofa rented cloud service in each sub-period in a charging period, wherein the number of the sub-periods is at least two; determining the network resource cost of each sub-period according to the network resource usage amount and the network resource leasing unit price of each sub-period; and selecting the network resource use mode with the lowest cost expense from the network resource cost expensesof the at least two sub-periods for leasing the cloud service. According to the embodiment of the invention, the optimization effect of the cloud service lease cost is improved.

The embodiment of the invention provides a power transmission and transformation inspection video processing method based on fog calculation. The method comprises the following steps: controlling a video acquisition terminal including an unmanned aerial vehicle to perform video acquisition of a power transmission and transformation line; segmenting the acquired video file into key video clips andcommon video clips according to the video analysis characteristics; sending the key video clips to a cloud server, and sending the common video clips to a fog processing device including a station server and a mobile computer to analyze the condition of the power transmission and transformation line; and separately receiving analysis results fed back by the plurality of processing devices, and sending the analysis results to a control center. According to the method, the key video clips and the common video clips are processed separately, so that the videos of the corresponding high-attentionpower transmission and transformation lines are processed in a high-quality manner, and meanwhile, the rental duration and the rental amount of the cloud server are reduced due to the fact that part of the videos are transferred, and the rental cost is further reduced.

The invention innovatively discloses an adult school calendar education student service management method and an adult school calendar education student service management system. On one hand, the invention provides an adult school calendar education student service management method, and the method comprises the following processing steps: 1, building an intention student list through an enrollment management module, then generating the intention student list to enrollment personnel for enrollment confirmation, and building an enrollment student list; 2, a contract is registered and signed inthe school roll management module according to the list of students entering school and the corresponding students, and school-entering procedure handling is completed; 3, the teaching management module carries out school teaching course arrangement according to the school roll information of the students and the teaching plans of the majors of the schools; and 4, the study supervising managementmodule obtains the study progress of each student and carries out academic progress statistics according to the examination result of each student. On the other hand, the invention provides an adultschool calendar education student service management system. According to the invention, teaching management and student learning can be effectively facilitated.

The invention provides a simple shallow foundation pit support system and a construction method. The simple shallow foundation pit support system comprises I-shaped steel, wherein the I-shaped steel is distributed in the circumferential direction of a foundation pit, the I-shaped steel is arranged in the vertical direction, the I-shaped steel is connected and reinforced through I-shaped steel purlins, steel plates are vertically arranged between every two adjacent I-shaped steel, both sides of the steel plates are respectively arranged in I-shaped steel grooves in both sides, steel groove limiting blocks are respectively welded to both sides of a web of the I-shaped steel, and the both sides of the steel plates are respectively clamped between the steel groove limiting blocks and wing plates of the I-shaped steel. The simple shallow foundation pit support system aims to solve the problems that rented steel sheet piles need to be supported, the number of rented steel sheet piles is small, the construction period is long, and the cost is high in an existing conventional vertical excavation construction method. The simple shallow foundation pit support system belongs to the field of building foundation pit construction.

Various embodiments of the present disclosure provide a curtain wall panel installation system. The curtain wall panel installation system of the present disclosure includes a plurality of rails each forming an elongated panel bracket spanning an entire edge or substantially the entire edge of a concrete floor slab of a given floor of a building. Each elongated panel bracket is mountable to anchors (such as embedments) cast in the concrete floor slab of a given floor of the building at discrete positions along the concrete floor. The elongated panel brackets enable the curtain wall panels to be laterally transported along the building facade to their respective installation positions, which enables workers to use a centralized crane location to hoist the curtain wall panels in preparation for installation.

The invention discloses a method for installing a fan on a three-legged platform ship, which comprises the following steps: S1, platform positioning: moving and fixing the three-legged platform ship along the downstream direction, adjusting the position of the three-legged platform ship, and positioning the three-legged platform ship; pile legs are lowered, and the three-leg platform ship is jacked; s2, tower drum hoisting, wherein a tower drum and accessory transport ship is carried to the left side or the right side of the three-legged platform ship and is positioned; the connecting bolts are hoisted to an upper platform and fixed, and the tower drums are hoisted to machine positions to be aligned and fastened; s3, hoisting the main engine hub: carrying and positioning the main engine hub transport ship; hoisting the main machine, pre-installing a connecting bolt, and butting and fastening the main machine with the tower drum; the hub is lifted and turned over through the hub mounting lifting appliance, and the hub is rotated to the position near a main machine to be aligned, mounted and fastened; s4, blade hoisting: carrying and positioning a blade transport ship; and the fan blades are hoisted for pre-installation of connecting bolts, single-blade clamps are replaced, the fan blades are hoisted in sequence, the fan blades are rotated to be aligned with a hub, fastening and turning are conducted, and a unit yaws by 180 degrees.

The invention discloses a wireless intelligent sorting system based on Internet of Things technology positioning. The wireless intelligent sorting system comprises at least one main station, at least one sub-station and at least one intelligent sorting small vehicle. The small vehicle travels along a fixed track, the starting point and the end point of the fixed track are coincident, the main station and the sub-station are arranged next to the fixed track, RFID tags are arranged on the main station, the sub-station and the intelligent sorting small vehicle, a first RFID reader-writer is arranged on the intelligent sorting small vehicle, the intelligent sorting small vehicle is connected with the first RFID reader-writer, the main station is provided with a server, a second RFID reader-writer, a wireless receiver and a scanner, the server is connected with the wireless receiver and the scanner, the server, the second RFID reader-writer and the intelligent sorting small vehicle are in wireless connection through the wireless receiver, the sub-station which each object belongs to is preset in the server, the small vehicle reads RFID tag information of the sub-station when passing through the sub-station, whether the sub-station is a target sub-station or not is judged, and if the sub-station is the target sub-station, unloading is conducted. The wireless intelligent sorting system based on Internet of Things technology positioning is low in cost, high in flexibility, simple in logic and low in maintenance cost.

The invention relates to a centralized storage and centralized distribution-type storage and distribution system, which comprises a client, a storage management system connected with the client, a PDAmanagement system associated with the storage management system, a distribution management system connected with the storage management system, an APP on-road management system associated with the distribution management system and a terminal associated with the APP on-road management system. The storage environment of goods can be monitored, multiple clients can be managed in a centralized and unified mode, and the management level is enhanced; and the use condition of multiple client warehouse resources can be monitored in real time, mutual matched use of the warehouse resources is realized, the warehouse utilization rate is enhanced maximally, and centralized storage operation is realized. Under the background of the centralized storage, automatic distribution and loading of client orders according to regions and emergency degree can be realized, the full loading rate of the vehicle can be enhanced maximally, social distribution vehicle resources are made full use of, the whole distribution process is tracked, the distribution quality is enhanced, and centralized storage and centralized distribution high-efficiency circulation mode is realized.

A cable type downhole descaling device comprises a steel brush head, a transmission device, an anchor, an electric motor, a pressure compensator, a controller and a cable joint which are sequentially connected. The cable type downhole descaling device is characterized in that the cable joint is connected with a ground control system through a cable, the controller is used for controlling the working process of the descaling device, the pressure compensator is used for keeping the pressure balance inside and outside the descaling device, and the electric motor is used for providing working power of the descaling device. During working, under the driving of the electric motor, a supporting arm of the anchor stretches, an anchor plate contacts with the inner wall of a casing pipe, the descaling device is firmly anchored on the inner wall of the casing pipe, then the electric motor drives a reciprocating screw and the steel brush head to conduct circumferential rotation and axial reciprocating motions simultaneously, and removal of downhole dirt is achieved through milling of a steel brush disk. The cable type downhole descaling device is simple in structure, convenient to operate, high in operating reliability, capable of effectively finishing descaling operation for downhole tools such as the casing pipe, a safety valve, a sliding sleeve valve and the like.

The embodiment of the invention discloses a video live broadcast system based on hybrid cloud storage and a signal processing method thereof. The system comprises a live broadcast end, a cloud serviceplatform and a playing end. The live broadcast end collects the original audio and video data through the audio and video collection unit, the original audio and video data is processed by the cloudservice platform and is transmitted to the playing end for display; the cloud service platform comprises a public cloud unit and a private cloud unit which establish communication transmission with each other, the public cloud unit is used as a common service for uploading data by the playing end and the live broadcast end, the public cloud unit comprises a shared cloud storage unit and a storagetime management unit, the shared cloud storage unit stores the live broadcast resources, and the storage time management unit deletes the data in the shared cloud storage unit on time. According to the scheme, through the mode of sharing the storage space, the full utilization of the storage space is guaranteed, the utilization rate of the storage space is improved, meanwhile, it is guaranteed that the resource storage requests of all users are responded in time, and the storage space leasing cost is reduced.

The invention discloses an inbound piece logistics distribution method and an inbound piece logistics sorting system, which are high in efficiency, high in speed and low in cost. According to the intelligent inbound piece logistics distribution method, after inbound pieces are subjected to primary sorting and secondary sorting in a distribution center, the inbound pieces do not need to be subjected to secondary sorting according to district deliverymen after arriving at a distribution spot, box bodies loaded with the inbound pieces are directly distributed to the deliverymen for distribution without occupying large space of the distribution spot, and therefore the distribution efficiency is improved, even no distribution spot needs to be additionally set, in this way, the occupied area aswell as the leasing cost of the distribution spot are saved, and meanwhile the labor cost is greatly saved without conducting storage, loading, unloading and sorting at the distribution spot; and in addition, the box bodies loaded with inbound pieces are distributed to the deliverymen for distribution after arriving at the distribution spot, so that the original secondary sorting time is reduced,the distribution efficiency is greatly improved, customer satisfaction can be greatly improved, and therefore the method is suitable for popularization and application in the technical field of logistics.

The invention discloses an installation device of a prefabricated bridge deck, which belongs to the field of bridge construction. The installation device comprises two longitudinal slide-way beams which are symmetrically and fixedly distributed on a top overhanging eave of a steel box beam in parallel, two transverse bearing beams which stretch across the two longitudinal slide-way beams and symmetrically arranged on the two longitudinal slide-way beams in parallel as well as two parallel symmetric longitudinal bearing beams which stretch across the two transverse bearing beams, wherein each longitudinal slide-way beam is respectively provided with a carrying tank and a limiting distribution device which is used for supporting the transverse bearing beam to slide back and forth along the longitudinal direction, each longitudinal slide-way beam is also provided with a gallows, and the gallows is connected to the limiting distribution device through a traction rope and pulls the carrying tank to slide on the longitudinal slide-way beam. The installation device can solve the problem that the prefabricated bridge deck is subjected to the limitation of the installation terrain and is safe to use, convenient and high-efficient to operate and easy to control.

The invention relates to the technical field of electric power 5G application, in particular to a cross-MEC resource management method considering electric power multi-service dynamic requirements, which comprises the following steps: a slice monitoring module acquires a sampling value sequence of electric power service traffic in real time, models the service k traffic into a normal distribution density function according to a central limit theorem, and stores the normal distribution density function; a sliding window sampling value sequence is adopted to calculate maximum likelihood estimation values of a service traffic probability density mean value and variance in a P * Ts time period, a service k traffic value under 95% probability is defined as a service demand threshold value, all service traffic demand threshold values are obtained through calculation, modeling is carried out on a minimization function, a Lagrange operator is iteratively updated through a sub-gradient algorithm, and a maximum likelihood estimation value of a service traffic probability density mean value and variance in a P * Ts time period is obtained. And solving an optimal MEC resource unit allocation result of the minimized target function under the constraint condition. Based on the method, the problem of massive multi-service flexible access requirements in the power industry is effectively solved, and the cost is effectively reduced while the real-time response success rate of massive service requirements is greatly improved.

The invention relates to an engineering machinery working state data acquisition system. The system is mainly composed of a data acquisition end and a data processing end that are in signal connection; the data acquisition end comprises a controller, and a motion sensor, a position sensor, a memory, a Beidou message module and a GPRS module that are respectively connected to the controller; the data processing end comprises a data processing module, and a Beidou receiver, a GPRS receiver and a storage module that are respectively connected to the data processing module; and the motion sensor comprises a vibration sensor and a gyroscope that are both connected to the controller. And meanwhile, the invention also discloses a method based on the above system. According to the scheme of the invention, through the cooperation of the GPRS module and the Beidou message module, a lessor can obtain positioning information of the engineering machinery in real time, and can also perform data interaction with a lessee in real time, and meanwhile, the normal transmission of data can also be ensured.

The invention provides a dynamic pricing cloud computing service resource scheduling method and system, which belong to the technical field of cloud computing. The method comprises the steps of obtaining dynamic pricing instance data of various specifications on a plurality of cloud service platforms in real time to obtain the price of a dynamic pricing instance at the next moment; obtaining a leasing scheme of the cloud computing service according to a self-adaptive differential evolution algorithm by taking minimum cost as a target and combining the workload demand, the price of the dynamicpricing instance at the next moment and the available instance type and quantity; and dynamically scheduling cloud computing service resources according to the obtained leasing scheme. For the dynamically priced cloud service instance, the instance combination renting problem and the bidding problem of a user are optimally designed by combining the type and the task load of the instance, so that the use experience of the user is improved, and the renting cost of the user is reduced.