KR20240023378A - Goods Order System For Mart Shopping - Google Patents

Abstract

The present invention relates to a product purchasing system for shopping at a mart. More specifically, the present invention relates to a system for purchasing products for shopping at a mart, and more specifically, rather than having a customer who visits a mart put the desired items in a cart and pay at the checkout counter, the desired purchased products are automatically stored and paid for by tagging the product recognition means. It is about a product purchasing system for supermarket shopping that allows you to directly check the product as it is delivered and achieve the same convenient effects as purchasing online.

Description

Goods Order System For Mart Shopping}

The present invention relates to a product purchasing system for shopping at a mart. More specifically, the present invention relates to a system for purchasing products for shopping at a mart, and more specifically, rather than having a customer who visits a mart put the desired items in a cart and pay at the checkout counter, the desired purchased products are automatically stored and paid for by tagging the product recognition means. It is about a product purchasing system for supermarket shopping that allows you to directly check the product as it is delivered and achieve the same convenient effects as purchasing online.

When a customer uses an offline mart, the process generally proceeds by placing desired items among the products on display within the mart directly into the cart and then paying in bulk at the checkout counter.

However, from the mart operator's point of view, there is a problem of securing store size to display a large number of products because all products handled in the mart must be displayed, and as the store size increases, the customer's line to find the desired product becomes longer, so it is difficult to purchase the product. There is a problem that shopping for a product takes a considerable amount of time, and since the staff calculates each product at the checkout counter for the product they want to purchase, there was a problem with the calculation being delayed when there are a lot of customers.

On the other hand, in the case of online marts, there are no space restrictions because they provide products sold online, and from the customer's perspective, they have the advantage of being able to quickly select products through search, but since they cannot directly check the products, there is the inconvenience caused by returns due to incorrect orders. There was a problem with the existence of the ship.

The purpose of the present invention, which was devised to solve the above problems, is to allow customers who visit a supermarket to put the items they want directly into a cart and pay for them by automatically storing and paying for the desired purchased product through tagging of a product recognition means, rather than having to pay at the checkout counter. The goal is to provide a product purchasing system for supermarket shopping that allows you to directly check the product as it is delivered and obtain the same convenient effects as an online purchase even though it is an offline purchase.

In order to achieve the above object, the product purchasing system for supermarket shopping according to the present invention is a product purchasing system for supermarket shopping that can secure the same convenience as online purchasing even though it is an offline purchase while directly checking the product; An identification tag displayed on the product; a user terminal equipped with a mart user application that provides an interface for ordering and paying for product units recognized through an identification tag recognition means that recognizes the identification tag; a mart management server that manages the identification tag and manages orders, payments, and delivery for the product purchase list entered and stored through the mart user application; It is characterized by including an administrator terminal that receives the paid purchase list and manages delivery.

The mart user application is a login management module that provides an interface for logging in to authenticate registered users in order to register users when the user management application is installed and create a purchase list when the user wants to purchase a desired product while shopping at the mart. class; a product information providing module that identifies the product from the identification information of the identification tag when the identification tag attached to the product is recognized through the identification tag recognition means and provides pre-stored product information about the identified product; When a user wants to purchase a desired product while shopping, a product order management module is provided that stores the identification information and purchase quantity of the desired product, creates a purchase list, and provides an interface to add, delete, or change the saved purchase list. ; When the purchase list is confirmed through the product order management module, it is characterized by including a payment and delivery management module that provides an interface for payment processing and delivery address designation for the purchase list.

The mart management server includes a mart management unit that comprehensively manages registered marts; a product information management department that manages product information with identification tags attached; a user management department that identifies and manages registered users; a product order management unit that stores in real time a purchase list of products selected by the user, and updates and manages product information available for sale in real time by comparing the purchase list with product inventory information; Finally, it is characterized by including a payment and delivery management department that manages payment and delivery of products according to payment requests and delivery requests for product purchase information stored by the user.

The mart management unit includes a mart registration management module that allocates mart identification information and comprehensively manages a plurality of registered marts, and a mart identification management module that identifies the mart from the mart identification information included in the received tag information; The product information management unit includes a product registration management module that allocates and manages identification information for individual products in accordance with the mart's product registration request, and a product information registration management module that registers and manages product information for products to which the identification information is assigned. and a mart product matching management module that manages products and product information to which the identification information is assigned by mapping them to marts. Even if the identification information for the same product is the same, if the mart where it is sold is different, the product is stored according to the mart identification information. Since identification information is mapped and product information such as price and discount is different for each mart where it is sold, product information is managed by dividing products by mart; When the user adds a desired product to the purchase list, the product order management department removes the purchase quantity of the product included in the purchase list from the product's inventory information, checks the real-time inventory quantity, and cancels or changes the quantity of the product from the purchase list. A real-time inventory management module that cancels changes or manages them in real time by reflecting the changed quantity in inventory information; If there is no payment for the purchase list for a set time, inventory information is managed by resetting the products included in the purchase list. When payment for the purchase list is approved, inventory information is confirmed and updated to reflect this, and according to payment approval. It includes a product sales management module that updates and manages sales information; The payment and delivery management department approves the payment when the user requests payment for the purchase list through the mart user application, sends a payment approval completion notification to the mart user application, and sends the payment approval information for the purchase list to the product purchase management department. A payment management module that transmits; It is characterized by including a delivery management module that manages delivery by transmitting the purchase list and delivery address information to the administrator terminal so that the products included in the purchase list are delivered to the delivery address registered by the user.

When a purchase list is created through multiple marts, the payment management module approves integrated payment and then performs settlement for each of the multiple marts included in the purchase list to enable integrated management even if products are purchased at multiple marts. It is characterized by being composed of:

The product consists of a sample product of the product provided by the supermarket; The above identification tag is attached to the sample product, so all products do not need to be displayed in the mart, and only sample products representative of each product sold can be displayed, thereby minimizing store space due to product display, and users can purchase sample products through sample products. It features products that can be checked directly and placed compactly through sample product placement, allowing shopping with minimal shopping traffic.

The products are divided into ready-made products and fresh products; For the ready-made products, only sample products are displayed and identification tags are attached only to the sample products. In the case of fresh products, all individual products are displayed and identification tags are attached to each individual product so that each product can be identified; It is characterized in that the user can directly select the fresh products and purchase the desired product.

The product purchasing system for mart shopping according to the present invention allows customers who visit the mart to place desired items directly in a cart and pay for them at the checkout counter. Instead, the desired purchased product is automatically stored, paid for, and delivered through tagging of a product recognition means, allowing the customer to purchase the product directly. As you check, an excellent effect occurs that allows you to obtain the same convenient effects as online purchasing even though it is an offline purchase.

1 is a system configuration diagram schematically showing a product purchasing system for supermarket shopping according to a preferred embodiment of the present invention;
Figure 2 is a detailed block diagram of Figure 1.
Figure 3 is a flowchart schematically showing a method of using a mart according to a preferred embodiment of the present invention.
Figure 4 schematically shows the process of visiting a plurality of marts and paying for and delivering purchased products according to a preferred embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 is a system configuration diagram schematically showing a system for purchasing products for supermarket shopping according to a preferred embodiment of the present invention, and Figure 2 is a detailed block diagram of Figure 1.

Referring to Figures 1 and 2, the product purchasing system for supermarket shopping according to the present invention is for ordering and payment of a product unit recognized through an identification tag 10 displayed on the product and an identification tag recognition means that recognizes the identification tag. A user terminal 20 equipped with a mart user application 220 that provides an interface, and a mart management server 30 that manages the identification tag and manages orders, payments, and delivery for the product purchase list entered and stored through the mart user application. ) and a manager terminal 40 that receives the paid purchase list and manages delivery.

Here, purchasing a product can be defined as a concept that includes ordering and delivery when ordering or delivery of a product is necessary, and a mart refers to a store that sells various products, as well as a large supermarket that sells various types of products simultaneously. It can be defined as a concept that includes small stores that specialize in selling a single product.

In addition, the products can be divided into ready-made products and fresh products. The ready-made products refer to factory-manufactured and standardized products, and the fresh products are naturally produced such as agricultural products and marine products, so differences in quality may occur for each product. It means a product that can be used.

The product may consist of a sample product of a product provided by a mart, and the identification tag may be attached to the sample product. Therefore, not all products need to be displayed in the mart, and only representative sample products for each product sold can be displayed, so the store space due to product display can be minimized, and users can follow the shopping flow because sample products can be placed compactly. You can shop by minimizing .

Here, in the case of fresh products, unlike ready-made products, differences in quality may occur between products, and since users can purchase products by directly checking the freshness, in the case of fresh products, individual products are displayed rather than sample products, and individual products are identified. By attaching a tag, the product the user selects to purchase can be processed to be delivered after payment.

More specifically, for ready-made products, only sample products are displayed and identification tags are attached only to sample products, and for fresh products, all individual products are displayed and identification tags may be attached to individual products so that each individual product can be identified.

The identification tag 10 may be composed of a typical identification tag such as a barcode, QR code, or NFC tag, and identification information may be stored in the identification tag. Here, the identification information essentially includes a unique identification code that identifies the product, and may optionally include product information about the product. And when the mart management server 30 manages a plurality of marts in an integrated manner, the identification information may include mart identification information.

And the identification tag recognition means 210 is a means for reading and recognizing the information stored in the identification tag, and may be configured as a barcode reader in the case of a barcode, a QR code reader in the case of a QR code, and an NFC reader in the case of an NFC tag.

The user terminal 20 may be configured to include the identification tag recognition means 210 and a mart user application 220, and the user terminal may be configured as a portable terminal owned by the user.

The mart user application 220 can be downloaded and installed from the mart management server or an external server, and is responsible for providing a user interface for product recognition, selection, payment, and delivery orders.

More specifically, the mart user application 220 includes a login management module 221 that manages user identification through login for user registration and product ordering, and a product information module that provides product information recognized through an identification tag recognition means. A provision module 222 and a product order management module 223 that provide an interface for users to select products they want to purchase, and a payment and delivery management module that provides an interface for payment and delivery requests for products ordered by users ( 224).

When the user management application is installed, the login management module 221 provides a login interface to authenticate the registered user in order to register the user and create a purchase list when the user wants to purchase a desired product while shopping at a mart.

The product information providing module 222 is responsible for identifying the product from the identification information of the identification tag when the identification tag attached to the product is recognized through the identification tag recognition means and providing pre-stored product information about the identified product. do.

In addition, the product order management module 223 stores the identification information and purchase quantity of the desired product when the user wants to purchase the desired product while shopping, creates a purchase list, and provides an interface to delete or change the stored purchase list. provides.

In other words, if there is a product that the user wants to purchase among the tagged products, he or she selects the purchase menu and enters the quantity. The product order management module provides the mart identification information where the product is displayed, product identification information, quantity, unit price, and price information. (including discount information if there is discount information) is calculated, displayed, added to the purchase list, and stored.

Accordingly, the user can directly check the price, quantity, and total price information of the product he or she has selected to purchase and add it to the purchase list.

The payment and delivery management module 224 provides an interface for payment processing and delivery address designation for the purchase list when the purchase list is confirmed through the product order management module.

Here, the payment method and delivery address for the payment can be registered when installing the application, and if it is necessary to change the payment method and delivery address, it can be configured to change by directly selecting it at the time of payment.

Meanwhile, the mart management server 30 related to the operation of the mart user application 22 includes a mart management unit 310 that comprehensively manages registered marts and a product information management unit 320 that manages product information with an identification tag attached. and a user management unit 330 that identifies and manages registered users, stores the purchase list of products selected by the user in real time, and updates and manages product information available for sale in real time by comparing the purchase list with the inventory information of the product. It may be comprised of an order management unit 340 and a payment and delivery management unit 350 that manages payment and delivery of products according to payment requests and delivery requests for product purchase information stored by users.

The mart management unit 310 includes a mart registration management module 311 that allocates mart identification information and comprehensively manages a plurality of registered marts, and a mart identification management module that identifies the mart from the mart identification information included in the received tag information. It may be configured to include (312).

The product information management unit 320 manages product information with identification tags attached, and when multiple marts are managed comprehensively, it classifies products sold by each mart and manages product information for each product classified by the mart. is in charge of

More specifically, the product information management unit 320 includes a product registration management module 321 that allocates and manages identification information for individual products in response to a product registration request from a mart, and product information for products to which the identification information is assigned. It may be configured to include a product information registration management module 322 that registers and manages and a mart product matching management module 323 that maps and manages products and product information to which the identification information is assigned.

Therefore, even if the identification information for the same product is the same, if the mart where it is sold is different, the product identification information is mapped according to the mart identification information. Since product information such as price, discount, etc. is different for each mart where it is sold, the products are classified by mart. Manage product information.

For example, if the same product, A, is sold at A-Mart, B-Mart, and C-Mart, even if it is the same product, product information such as price, expiration date, inventory, and discount information may be different for each mart, so Product A at A-Mart, It is classified into product A from B Mart and product A from C Mart, and individual product information is stored and managed.

The user management unit 330 is responsible for registering and managing users who have installed the mart user application, and the new user management module 331 manages new user registration and authenticates the user when the user runs the mart user application. Including a user authentication module 332 that stores and manages the user's purchase history information, point information, and discount information provided to the user when payment for the user's purchase list is completed. It can be configured.

When the user adds a desired product to the purchase list, the product order management unit 340 removes the purchase quantity of the product included in the purchase list from the product inventory information, checks the real-time inventory quantity, and cancels the product from the purchase list. a real-time inventory management module 341 that cancels or changes the quantity and manages it in real time by reflecting the changed quantity in the inventory information; If there is no payment for the purchase list for a set time, inventory information is managed by resetting the products included in the purchase list. When payment for the purchase list is approved, inventory information is confirmed and updated to reflect this, and according to payment approval. It may be configured to include a product sales management module 342 that updates and manages sales information.

Therefore, when customer A adds 5 products a to the purchase list, if the inventory of product a is 100, the inventory is managed by changing it to 95, and if the 2 products above are canceled, the inventory is managed by changing it to 97. By doing so, other customers can shop while checking the inventory status of specific products in real time.

When a user requests payment for a purchase list through a mart user application, the payment and delivery management unit 350 approves the payment, transmits a payment approval completion notification to the mart user application, and sends payment approval information for the purchase list to the product. A payment management module (351) transmitted to the purchasing management department; It may be configured to include a delivery management module 352 that manages delivery by transmitting the purchase list and delivery address information to the manager terminal so that products included in the purchase list are delivered to the delivery address registered by the user.

Here, the payment management module approves integrated payment when a purchase list is created through multiple marts, and then performs settlement for each of the multiple marts included in the purchase list, so that even if products are purchased at multiple marts, integrated management is possible. It can be configured to make it possible.

Hereinafter, we will look at the specific method of using the mart of the present invention.

Figure 3 is a flowchart schematically showing a method of using a mart according to a preferred embodiment of the present invention.

Referring to Figure 3, the user first installs the Mart user application on the user terminal, connects to the Mart management server, and registers as a member through authentication.

The membership registration refers to the process of registering user information by going through identity verification and setting an ID and password. When registering the user information, payment method and delivery map can be registered and managed.

Next, when the user visits the mart, the mart user application on the user terminal is activated, the identification tag for the product of interest is recognized, the product is identified, and the identified product information is provided to the user.

More specifically, when the identification tag recognition means of the user terminal recognizes the identification tag, the product information providing module of the mart user application transmits the tag information of the identification tag recognized by the identification tag recognition means to the mart management server, and the mart The product information management unit of the management server identifies the mart and product from the tag information, extracts pre-stored product information for the identified product, and transmits it to the user terminal. The product information provision module transmits the transmitted product information through the user terminal. Print out.

Here, the tag information may include mart identification information and unique identification information of the product to which the identification tag is attached, and the product information may include the product's name, use, capacity, manufacturer, date of manufacture, expiration date, inventory quantity, It may include information related to product purchase, such as discount information.

The product information management unit maps and manages tag information attached to the product and product information, and when tag information is identified, specific mart and product information are identified.

Therefore, when the user recognizes the identification tag attached to the product through the identification tag recognition means of the user terminal, tag information can be obtained and transmitted to the mart management server, and the mart identification information and unique identification information of the product included in the tag information Through this, the product information management department can identify marts and products, extract and provide product information for the identified products.

Accordingly, the user can freely select the desired product while recognizing the identification tag attached to the product displayed in the mart and looking at the provided product information.

For example, if there are multiple products with the same item, you can select the optimal product by comparing the product's price, capacity, expiration date, discount information, and inventory status information in real time.

And when the user selects the desired product, it is saved and uploaded to the purchase list (shopping cart).

More specifically, if there is a product that the user wishes to purchase after looking at the product information provided by the product information provision module, the product order management module of the mart user application provides an interface to select the product.

Here, the product order management module can receive inventory status information of the product desired by the user from the product information management department, and the user can check the inventory status information and select the product by specifying the desired quantity. When the product is selected, the user can select the product. The product order management module temporarily stores the selected product in the purchase information and creates a purchase information list.

If the above product is a ready-made product, you only need to check the quantity since it is a factory-manufactured product. However, if it is a fresh product, there may be differences in quality depending on the product, so the user may want to purchase the product they have personally selected.

Therefore, in the case of fresh products, it is possible to display original products rather than samples, and attach identification tags on an individual product basis rather than a product item basis so that each individual product can be identified, and the individual product designated by the user is selected. can do.

Here, when the fresh product selected by the user is included in the purchase list, if another user tags the fresh product, the product information is displayed as a purchased product, so that the product included in the purchase list can be distinguished from the unpurchased product.

In addition, for the convenience of delivery by the mart manager, the fresh products included in the user's purchase list can be configured to be placed on the delivery shelf separately from the fresh product display, and the mart manager can check the product identification information included in the purchase list to ensure that the user can You can configure the selected product to be delivered.

According to the above process, the user selects the product he or she wants to purchase while shopping at the mart, and when all the desired products are selected, payment for the product is performed through the payment and delivery management module for the selected purchase list.

More specifically, once the purchase list is confirmed, the user can make payment using the desired payment method through the payment and delivery management module. If there is a payment request, the payment and delivery management unit of the mart management server processes the payment request. Once approved and the delivery address desired by the user is selected, the purchase list and delivery address information are transmitted to the mart manager terminal.

Here, the payment may be made through a credit card, and if the mart has a cashier, cash payment for the purchase list may also be possible.

Since the above credit card payment method can be applied using a regular mobile phone, detailed explanation will be omitted.

Here, the payment method and delivery address can be registered in advance, and payment and delivery requests can be registered with one click after shopping at the supermarket is completed.

When the payment and delivery management department approves the payment, the purchase list is transmitted to the product information management department, and the product information management department subtracts the purchase list from the product inventory status information to upgrade and manage the product inventory status information.

When the purchase list and delivery address information are transmitted to the supermarket manager terminal as described above, the delivery staff delivers the products included in the purchase list to the delivery address.

Therefore, while shopping at the mart, the user can directly check the products, select the desired products, create a purchase list, and have the products delivered to the desired delivery address through payment through the user terminal, providing a convenient service that combines the advantages of offline and online marts. Shopping is possible.

Although the above embodiment is for shopping and paying at a single mart, it can be configured to allow shopping at multiple marts, paying at once, and receiving delivery.

Figure 4 schematically shows the process of visiting a plurality of marts and paying for and delivering purchased products according to a preferred embodiment of the present invention.

Generally, in the case of department stores and large complex marts, users can purchase most of the products they need at once in one place, but in cases where small marts with different management entities are concentrated, they must visit individual marts and purchase them individually.

However, since the present invention is capable of integrated management of multiple marts, it is possible to visit multiple registered marts, create a purchase list, and receive simultaneous payment and delivery.

For example, even in the case of a mart where stores are divided according to product, such as a butcher shop, small mart, bakery, or bookstore, if each individual store is registered as a mart according to the present invention, products can be purchased by visiting different types of marts. Even if you purchase , you can have the same effect as visiting a single supermarket and shopping.

More specifically, when a user visits Mart A, creates a purchase list for product B, visits B Mart, adds a purchase list for product 1, completes the purchase list, and requests payment, the mart management server processes the plurality of items. It is possible to perform integrated payment for a list of purchases for several marts and provide an integrated delivery service.

When payment for multiple purchase lists is approved as described above, the payment and delivery management department of the mart management server classifies the purchase list for each mart, separates the detailed payment information and provides it to the manager of each mart, and the integrated delivery staff member Products included in the purchase list can be received from each mart and delivered to the user in an integrated manner.

Although the detailed description of the present invention described above has been described with reference to preferred embodiments of the present invention, the scope of protection of the present invention is not limited to the above embodiments, and those skilled in the art will understand the present invention. It will be understood that the present invention can be modified and changed in various ways without departing from the spirit and technical scope.

10: identification tag 20: user terminal
30: Mart management server 40: administrator terminal

Claims (1)

It is a product purchasing system for supermarket shopping that allows you to check the product directly and secure the same convenience as online purchasing even though it is an offline purchase;
An identification tag displayed on the product;
a user terminal equipped with a mart user application that provides an interface for ordering and paying for product units recognized through an identification tag recognition means that recognizes the identification tag;
a mart management department that comprehensively manages registered marts; a product information management department that manages product information with identification tags attached; a user management department that identifies and manages registered users; a product order management unit that stores in real time a purchase list of products selected by the user, and updates and manages product information available for sale in real time by comparing the purchase list with product inventory information; Ultimately, it includes a payment and delivery management department that manages payment and delivery of products according to payment requests and delivery requests for product purchase information saved from users, and manages the identification tags and enters them into the saved product purchase list through the mart user application. a mart management server that manages orders, payments, and deliveries;
Includes an administrator terminal that receives the paid purchase list and manages delivery;
The mart user application is
When the user management application is installed, a login management module that provides an interface for logging in to authenticate the registered user in order to register the user and create a purchase list when the user wants to purchase a desired product while shopping at a mart;
a product information providing module that identifies the product from the identification information of the identification tag when the identification tag attached to the product is recognized through the identification tag recognition means and provides pre-stored product information for the identified product;
When a user wants to purchase a desired product while shopping, a product order management module is provided that stores the identification information and purchase quantity of the desired product, creates a purchase list, and provides an interface to add, delete, or change the saved purchase list. ;
When the purchase list is confirmed through the product order management module, it includes a payment and delivery management module that provides an interface for processing payment for the purchase list and specifying a delivery address;
The mart management department
It is configured to include a mart registration management module that allocates mart identification information and comprehensively manages a plurality of registered marts, and a mart identification management module that identifies the mart from the mart identification information included in the received tag information;
The product information management department
A product registration management module that allocates and manages identification information for individual products according to a product registration request from a mart, a product information registration management module that registers and manages product information for products to which the identification information is assigned, and the identification information. It consists of a mart product matching management module that maps and manages assigned products and product information to marts, so even if the identification information of the same product is the same, if the mart where it is sold is different, the product identification information is mapped according to the mart identification information. Since product information such as price, discount, etc. is different for each mart where it is sold, product information is managed by classifying products by mart;
When the user adds a desired product to the purchase list, the product order management department removes the purchase quantity of the product included in the purchase list from the product's inventory information, checks the real-time inventory quantity, and cancels or changes the quantity of the product from the purchase list. A real-time inventory management module that cancels changes or manages them in real time by reflecting the changed quantity in inventory information; If there is no payment for the purchase list for a set time, inventory information is managed by resetting the products included in the purchase list. When payment for the purchase list is approved, inventory information is confirmed and updated to reflect this, and according to payment approval. It includes a product sales management module that updates and manages sales information;
The payment and delivery management department approves the payment when the user requests payment for the purchase list through the mart user application, sends a payment approval completion notification to the mart user application, and sends payment approval information for the purchase list to the product order management department. A payment management module that transmits; It includes a delivery management module that manages delivery by transmitting the purchase list and delivery address information to the administrator terminal so that the products included in the purchase list are delivered to the delivery address registered by the user;
The payment management module is
If a purchase list is created through multiple marts, after approving integrated payment, settlement is performed for each of the multiple marts included in the purchase list, so that integrated management is possible even if products are purchased at multiple marts;
The above product is
It consists of sample products for products provided by the supermarket;
The above identification tag is attached to the sample product so that only representative sample products for each product sold can be displayed, thereby minimizing the store space due to product display, and users can directly check the product through the sample product and place the sample product. Because products can be placed compactly, you can shop with minimal shopping traffic;
The products are divided into ready-made products and fresh products;
For the ready-made products, only sample products are displayed and identification tags are attached only to the sample products; in the case of fresh products, all individual products are displayed and identification tags are attached to each individual product so that each product can be identified;
Users can directly select the fresh products and purchase the desired products;
When the fresh product selected by the user is included in the purchase list, when another user tags the fresh product, it is displayed as a purchased product in the product information, so that it is possible to distinguish between products included in the purchase list and unpurchased products. Product purchasing system for supermarket shopping.