Two-step mobile search method-based reachability evaluation method for old-age care meal assistance mechanism

Abstract

The invention provides a two-step mobile search method-based reachability evaluation method for an old-age care meal assistance mechanism, and relates to the field of reachability evaluation. The method comprises the following steps: firstly, acquiring old-age care meal assistance mechanism and demand point information; secondly, taking the old-age care meal-assisting institutions as a center, taking a preset time threshold value as a search radius, searching all demand points in a range, introducing a Gaussian attenuation function, and calculating a supply-demand ratio of each old-age care meal-assisting institution; and finally, taking the demand point as a center, taking a time threshold value as a search radius, and summing the supply-demand ratios of all the old-age care meal-assisting institutions in a search range to obtain an old-age care meal-assisting institution reachability value of each demand point. According to the invention, the Gaussian 2SFCA is adopted to truly simulate the distance attenuation characteristics of the old in the actual travel process, and the travel time is used to replace the Euclidean distance between the old-age care meal assistance mechanism and the demand point as the travel cost, and the reachability evaluation is carried out on the old-age care meal assistance mechanism according to the facility grade. And the reachability value of the elderly going to the old-age care meal-assisting institution can be more accurately calculated.

Description

Technical Field

[0001] The present invention relates to the field of accessibility evaluation, and in particular to a method, system, storage medium and electronic device for evaluating the accessibility of an elderly care and dining assistance institution based on a two-step mobile search method. Background Art

[0002] As the aging population in my country continues to deepen, how to meet the needs of many elderly people has become one of the key issues facing society today. Among them, elderly meal assistance services are an important part of community home-based elderly care services.

[0003] Accessibility refers to the difficulty of reaching another location from a given location. It is often used to measure the rationality of public facility layout and resource allocation. With the continuous deepening of accessibility research, many different quantitative methods for calculating accessibility have been developed. Existing accessibility measurement methods include potential model, two-step mobile search method, opportunity accumulation method, nearest distance method, etc. Among them, the two-step mobile search method (2SFCA) is a widely used accessibility calculation method. The traditional two-step mobile search method takes the supply point and the demand point as the center respectively, and searches the number of facilities within the same threshold range twice. The cumulative supply-demand ratio of each demand point is the accessibility value of the point.

[0004] However, on the one hand, in the traditional two-step mobile search method, regardless of the distance between the facility point and the demand point, the accessibility within the travel threshold range is always the same value, ignoring the attenuation of the accessibility value within the threshold range, and the facility points outside the threshold range are considered completely unreachable. On the other hand, the research on accessibility in the existing technology is mostly applied to the fields of medical care, education, green space, etc., and the application in the elderly care field is mainly aimed at elderly care facilities such as nursing homes and homes for the elderly, and there are few studies on the accessibility of elderly care and dining institutions. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the shortcomings of the prior art, the present invention provides a method, system, storage medium and electronic device for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method, which solves the technical problem that the traditional two-step mobile search method ignores the attenuation of the accessibility value within the threshold range.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A method for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method includes:

[0010] Obtain information on elderly care meal assistance institutions and demand points; wherein the elderly care meal assistance institutions at least include elderly canteens and elderly care meal assistance points;

[0011] Taking the elderly care and dining assistance institution as the center and the preset time threshold as the search radius, all demand points within the search range are searched, and the Gaussian attenuation function is introduced to calculate the supply-demand ratio of each elderly care and dining assistance institution;

[0012] Taking the demand point as the center and the time threshold as the search radius, the supply-demand ratios of all elderly care and dining institutions within the search range are summed to obtain the accessibility value of the elderly care and dining institutions for each demand point.

[0013] Preferably, walking and public transportation are used as the transportation modes for the elderly to go to the elderly care and dining assistance institutions, and the Gaussian attenuation function is expressed as:

[0014]

[0015]

[0016] Among them, G(t ij,w ,t 0,w ) and G(t ij,p ,t 0,p ) are Gaussian attenuation functions corresponding to walking and public transportation respectively; t ij,w and t ij,p and t are the walking time and public transportation time between demand point i and elderly care and dining institution j respectively; 0,w is the time threshold for elderly people to walk between demand point i and elderly care and dining institution j; t 0,p is the time threshold for the elderly to travel by public transportation between demand point i and elderly care and dining institution j, D i is the number of elderly people at demand point i.

[0017] Preferably, the supply-demand ratio of each elderly care and dining assistance institution is expressed as:

[0018]

[0019] Among them, R j,w and R j,p are the supply and demand ratios of the elderly going to the nursing and dining institution j by walking and public transportation, respectively, j is the area of ​​the elderly care and dining assistance institution j.

[0020] Preferably, the accessibility value of the elderly care and dining assistance institution for each demand point is expressed as:

[0021] A i =A i,w +A i,p

[0022]

[0023] Among them, A i A is the accessibility value of the elderly care and dining assistance institution at demand point i; i,w and A i,p are the accessibility values ​​of the elderly from demand point i to the elderly care and dining assistance institution by walking and public transportation, respectively.

[0024] A system for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method includes:

[0025] An information acquisition module is used to obtain information on elderly care and dining assistance institutions and demand points; wherein the elderly care and dining assistance institutions at least include elderly canteens and elderly care and dining assistance points;

[0026] The supply-demand ratio calculation module is used to take the elderly care and dining assistance institution as the center, use the preset time threshold as the search radius, search all demand points within the range, introduce the Gaussian attenuation function, and calculate the supply-demand ratio of each elderly care and dining assistance institution;

[0027] The accessibility evaluation module is used to take the demand point as the center, use the time threshold as the search radius, sum the supply-demand ratios of all elderly care and dining institutions within the search range, and obtain the accessibility value of the elderly care and dining institution for each demand point.

[0028] Preferably, walking and public transportation are used as the transportation modes for the elderly to go to the elderly care and dining assistance institutions, and the Gaussian attenuation function is expressed as:

[0029]

[0030] Among them, G(t ij,w ,t 0,w ) and G(t ij,p ,t 0,p ) are Gaussian attenuation functions corresponding to walking and public transportation respectively; t ij,w and t ij,p and t are the walking time and public transportation time between demand point i and elderly care and dining institution j respectively; 0,w is the time threshold for elderly people to walk between demand point i and elderly care and dining institution j; t 0,p is the time threshold for the elderly to travel by public transportation between demand point i and elderly care and dining institution j, D i is the number of elderly people at demand point i.

[0031] Preferably, the supply-demand ratio of each elderly care and dining assistance institution is expressed as:

[0032]

[0033]

[0034] Among them, R j,w and R j,p are the supply and demand ratios of the elderly going to the nursing and dining institution j by walking and public transportation, respectively, j is the area of ​​the elderly care and dining assistance institution j.

[0035] Preferably, the accessibility value of the elderly care and dining assistance institution for each demand point is expressed as:

[0036] A i =A i,w +A i,p

[0037]

[0038] Among them, A i A is the accessibility value of the elderly care and dining assistance institution at demand point i; i,w and A i,p are the accessibility values ​​of the elderly from demand point i to the elderly care and dining assistance institution by walking and public transportation, respectively.

[0039] A computer-readable storage medium stores a computer program, which can implement the accessibility evaluation method for elderly care and dining assistance institutions based on the two-step mobile search method as described above when a processor executes the computer program.

[0040] An electronic device, comprising:

[0041] One or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the programs include a method for executing the accessibility evaluation method of elderly care and dining assistance institutions based on the two-step mobile search method as described above.

[0042] (III) Beneficial effects

[0043] The present invention provides a method, system, storage medium and electronic device for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method. Compared with the prior art, it has the following beneficial effects:

[0044] In the present invention, firstly, the information of the elderly care and dining assistance institutions and the demand points is obtained; secondly, the elderly care and dining assistance institutions are taken as the center, the preset time threshold is used as the search radius, all the demand points within the search range are searched, and the Gaussian attenuation function is introduced to calculate the supply-demand ratio of each elderly care and dining assistance institution; finally, the demand point is taken as the center, the time threshold is used as the search radius, and the supply-demand ratios of all the elderly care and dining assistance institutions within the search range are summed to obtain the accessibility value of the elderly care and dining assistance institutions for each demand point. The present invention adopts Gaussian 2SFCA to truly simulate the distance attenuation characteristics of the elderly in the actual travel process, and uses the travel time instead of the Euclidean distance between the elderly care and dining assistance institutions and the demand points as the travel cost, and evaluates the accessibility of the elderly care and dining assistance institutions according to the facility level, which can more accurately calculate the accessibility value of the elderly to the elderly care and dining assistance institutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A block diagram of a method for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method provided by an embodiment of the present invention;

[0047] Figure 2 A visual schematic diagram of an elderly care and dining assistance institution provided in an embodiment of the present invention;

[0048] Figure 3 A visualization diagram of a demand point provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The embodiments of the present application provide a method, system, storage medium and electronic device for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method, thereby solving the technical problem that the traditional two-step mobile search method ignores the attenuation of the accessibility value within a threshold range.

[0051] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0052] In order to more accurately measure the accessibility of elderly care and dining assistance institutions, the embodiment of the present invention adopts an improved two-step mobile search method to evaluate the accessibility of elderly care and dining assistance institutions, and expands it from two aspects: distance attenuation function and travel mode.

[0053] In order to consider the situation of distance decay within the scope, the embodiment of the present invention introduces the attenuation function of the two-step moving search method. At present, the commonly used extension types of the attenuation function of the two-step moving search method include enhanced 2SFCA, kernel density 2SFCA, gravity 2SFCA and Gaussian 2SFCA. Among them, Gaussian 2SFCA is a widely used extension form, and its accessibility decay rate first accelerates and then slows down with the increase of distance. The embodiment of the present invention uses Gaussian 2SFCA to simulate the distance attenuation characteristics of the elderly when choosing a nursing and dining assistance institution.

[0054] Furthermore, the embodiment of the present invention selects to add a Gaussian attenuation function to the traditional two-step mobile search method, which can more realistically simulate the distance attenuation characteristics of the elderly in the actual travel process, improve the traditional two-step mobile search method, which cannot reflect the attenuation of the accessibility value within the threshold range of the facility to be evaluated, and obtain an accessibility value that is more in line with the actual situation; when analyzing the accessibility of elderly care and dining assistance institutions, the embodiment of the present invention takes into account the different attractiveness of elderly care and dining assistance institutions with different facility scale levels to the elderly, and adds a classification of facility levels, which can more realistically simulate the behavior of the elderly choosing elderly care and dining assistance institutions when traveling; the embodiment of the present invention takes into account the preferential policies for the elderly to take public transportation and the impact of the elderly's physical condition on travel mode and time, and sets the travel modes for the elderly to go to dining assistance institutions as walking and public transportation respectively. At the same time, according to the "15-minute living circle" theory, the embodiment of the present invention sets the travel time threshold for the elderly to go to dining assistance institutions to 15 minutes, which can more realistically simulate the actual situation of the elderly's travel.

[0055] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0056] Embodiment 1:

[0057] like Figure 1 As shown, the embodiment of the present invention provides a method for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method, including:

[0058] S1. Obtain information on elderly care meal assistance institutions and demand points; wherein the elderly care meal assistance institutions at least include elderly canteens and elderly care meal assistance points;

[0059] S2. Taking the elderly care and dining assistance institution as the center and the preset time threshold as the search radius, all demand points within the search range are searched, and a Gaussian attenuation function is introduced to calculate the supply-demand ratio of each elderly care and dining assistance institution;

[0060] S3. Taking the demand point as the center and the time threshold as the search radius, the supply-demand ratios of all elderly care and dining assistance institutions within the search range are summed to obtain the accessibility value of the elderly care and dining assistance institutions for each demand point.

[0061] The embodiment of the present invention adopts Gaussian 2SFCA to truly simulate the distance attenuation characteristics of the elderly during their actual travel, and uses travel time instead of the Euclidean distance between the elderly care and dining assistance institution and the demand point as the travel cost. The elderly care and dining assistance institutions are evaluated for accessibility based on facility levels, which can more accurately calculate the accessibility value of the elderly to the elderly care and dining assistance institutions.

[0062] The following are the steps of the above solution:

[0063] In step S1, the information of elderly care and dining assistance institutions and demand points is obtained; wherein the elderly care and dining assistance institutions at least include elderly canteens and elderly care and dining assistance points.

[0064] In this step, elderly dining assistance institutions can be specifically divided into elderly dining halls and elderly dining assistance points. Among them, elderly dining halls have a back kitchen, and the dining area is not less than 50 square meters in principle; elderly dining assistance points do not have a back kitchen, and mainly provide meal delivery, dine-in, and meal heating services. The dining area and meal supply capacity are smaller than elderly dining halls. Therefore, the facility level of elderly dining assistance points is lower than that of elderly dining halls. Taking into account that different facility levels will have a certain impact on the travel choice behavior of the elderly, the subsequent embodiments of the present invention will calculate the elderly dining assistance facilities of the two facility levels separately.

[0065] For example, after obtaining the information of elderly care and dining assistance institutions in the target area, the visualization results are as follows: Figure 2 shown.

[0066] In addition, it can be understood that the demand point in the embodiment of the present invention is the residence point of the elderly.

[0067] For example, after obtaining the demand point information in the target area, the visualization result is as follows: Figure 3 shown.

[0068] In step S2, taking the elderly care and dining assistance institution as the center and the preset time threshold as the search radius, all demand points within the search range are searched, and a Gaussian attenuation function is introduced to calculate the supply-demand ratio of each elderly care and dining assistance institution.

[0069] It should be noted that the embodiments of the present invention define:

[0070] In terms of travel modes, taking into account the travel characteristics of the elderly and the unique public transportation preferential policies for the elderly, walking and public transportation are used as modes of transportation for the elderly to go to elderly care and dining institutions.

[0071] For example, based on the "15-minute living circle" theory, the time threshold for an elderly person to walk to an elderly care and dining institution is set at 15 minutes, and the walking concept of the "15-minute living circle" is extended to public transportation, and the time threshold for an elderly person to take public transportation to an elderly care and dining institution is also set at 15 minutes (of course, it can also be set to a different time threshold).

[0072] In addition, it should be noted that the embodiment of the present invention selects to add a Gaussian attenuation function to the traditional two-step mobile search method, which can more realistically simulate the distance attenuation characteristics of the elderly in the actual travel process, improve the traditional two-step mobile search method that cannot reflect the attenuation of the accessibility value within the threshold range of the facility to be evaluated, and obtain an accessibility value that is more in line with the actual situation.

[0073] Correspondingly, the Gaussian attenuation function in this step is expressed as:

[0074]

[0075] Among them, G(t ij,w ,t 0,w ) and G(t ij,p ,t 0,p ) are Gaussian attenuation functions corresponding to walking and public transportation respectively; t ij,w and t ij,p and t are the walking time and public transportation time between demand point i and elderly care and dining institution j respectively; 0,w is the time threshold for elderly people to walk between demand point i and elderly care and dining institution j; t 0,p is the time threshold for the elderly to travel by public transportation between demand point i and elderly care and dining institution j, D i is the number of elderly people at demand point i.

[0076] On this basis, it is further clarified that the supply-demand ratio of each elderly care and dining institution in this step is expressed as:

[0077]

[0078] Among them, R j,w and R j,p are the supply and demand ratios of the elderly going to the nursing and dining institution j by walking and public transportation, respectively, j is the area of ​​the elderly care and dining assistance institution j.

[0079] In step S3, taking the demand point as the center and the time threshold as the search radius, the supply-demand ratios of all elderly care and dining institutions within the search range are summed to obtain the accessibility value of the elderly care and dining institutions for each demand point.

[0080] Based on the supply-demand ratio calculated in the previous step, the two-step mobile search method can be used to further calculate the accessibility value of the elderly from each demand point to the elderly care and dining institution by walking and public transportation; it can be expressed as:

[0081]

[0082] Among them, A i,w and A i,p are the accessibility values ​​of the elderly from demand point i to the elderly care and dining institutions by walking and public transportation, respectively. The higher the value, the better the accessibility of the elderly care and dining institutions in the residential area under the corresponding travel mode.

[0083] Finally, the accessibility value of the elderly care and dining assistance institution for demand point i can be calculated:

[0084] A i =A i,w +A i,p

[0085] It can be understood that the accessibility value of the elderly care and dining institution at demand point i is A i The higher the value, the better the accessibility of the elderly care and dining institutions in the residential area.

[0086] So far, the embodiment of the present invention has completed the entire process of the accessibility evaluation method for elderly care and dining assistance institutions based on the two-step mobile search method.

[0087] Embodiment 2:

[0088] The embodiment of the present invention provides a system for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method, including:

[0089] An information acquisition module is used to obtain information on elderly care and dining assistance institutions and demand points; wherein the elderly care and dining assistance institutions at least include elderly canteens and elderly care and dining assistance points;

[0090] The supply-demand ratio calculation module is used to take the elderly care and dining assistance institution as the center, use the preset time threshold as the search radius, search all demand points within the range, introduce the Gaussian attenuation function, and calculate the supply-demand ratio of each elderly care and dining assistance institution;

[0091] The accessibility evaluation module is used to take the demand point as the center, use the time threshold as the search radius, sum the supply-demand ratios of all elderly care and dining institutions within the search range, and obtain the accessibility value of the elderly care and dining institution for each demand point.

[0092] In an optional implementation, the embodiment of the present invention uses walking and public transportation as the transportation mode for the elderly to go to the elderly care and dining assistance institution, and the Gaussian attenuation function is expressed as:

[0093]

[0094] Among them, G(t ij,w ,t 0,w ) and G(t ij,p ,t 0,p ) are Gaussian attenuation functions corresponding to walking and public transportation respectively; t ij,w and t ij,p and t are the walking time and public transportation time between demand point i and elderly care and dining institution j respectively; 0,w is the time threshold for elderly people to walk between demand point i and elderly care and dining institution j; t 0,p is the time threshold for the elderly to travel by public transportation between demand point i and elderly care and dining institution j, D i is the number of elderly people at demand point i.

[0095] In an optional implementation, the supply-demand ratio of each elderly care and dining assistance institution is expressed as:

[0096]

[0097] Among them, R j,w and R j,p are the supply and demand ratios of the elderly going to the nursing and dining institution j by walking and public transportation, respectively, j is the area of ​​the elderly care and dining assistance institution j.

[0098] In an optional implementation, the accessibility value of the elderly care and dining assistance institution for each demand point is expressed as:

[0099] A i =A i,w +A i,p

[0100]

[0101] Among them, A i A is the accessibility value of the elderly care and dining assistance institution at demand point i; i,w and A i,p are the accessibility values ​​of the elderly from demand point i to the elderly care and dining assistance institution by walking and public transportation, respectively.

[0102] Embodiment 3:

[0103] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When a processor executes the computer program, the accessibility evaluation method for elderly care and dining assistance institutions based on the two-step mobile search method as described in Example 1 can be implemented.

[0104] Embodiment 4:

[0105] An embodiment of the present invention provides an electronic device, including:

[0106] One or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the programs include a method for executing the accessibility evaluation method for elderly care and dining assistance institutions based on the two-step mobile search method as described in Example 1.

[0107] It can be understood that the elderly care and dining assistance institution accessibility evaluation system, storage medium and electronic device based on the two-step mobile search method provided in the embodiments of the present invention correspond to the elderly care and dining assistance institution accessibility evaluation method based on the two-step mobile search method provided in the embodiments of the present invention, and the explanations, examples and beneficial effects of the relevant contents can refer to the corresponding parts in the elderly care and dining assistance institution accessibility evaluation method, which will not be repeated here.

[0108] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0109] The embodiment of the present invention adopts Gaussian 2SFCA to truly simulate the distance attenuation characteristics of the elderly during their actual travel, and uses travel time instead of the Euclidean distance between the elderly care and dining assistance institution and the demand point as the travel cost. The elderly care and dining assistance institutions are evaluated for accessibility based on facility levels, which can more accurately calculate the accessibility value of the elderly to the elderly care and dining assistance institutions.

[0110] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0111] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method, characterized in that: include: Obtain information on elderly care meal assistance institutions and demand points; wherein the elderly care meal assistance institutions at least include elderly canteens and elderly care meal assistance points; Taking the elderly care and dining assistance institution as the center and the preset time threshold as the search radius, all demand points within the search range are searched, and the Gaussian attenuation function is introduced to calculate the supply-demand ratio of each elderly care and dining assistance institution; Taking the demand point as the center and the time threshold as the search radius, the supply-demand ratios of all elderly care and dining institutions within the search range are summed to obtain the accessibility value of the elderly care and dining institutions for each demand point.

2. The accessibility evaluation method for elderly care and dining assistance institutions according to claim 1 is characterized in that: Taking walking and public transportation as the transportation modes for the elderly to go to the elderly care and dining institutions, the Gaussian attenuation function is expressed as: Among them, G(t ij,w ,t 0,w ) and G(t ij,p ,t 0,p ) are Gaussian attenuation functions corresponding to walking and public transportation respectively; t ij,w and t ij,p and t are the walking time and public transportation time between demand point i and elderly care and dining institution j respectively; 0,w is the time threshold for elderly people to walk between demand point i and elderly care and dining institution j; t 0,p is the time threshold for the elderly to travel by public transportation between demand point i and elderly care and dining institution j, D i is the number of elderly people at demand point i.

3. The accessibility evaluation method for elderly care and dining assistance institutions according to claim 2 is characterized in that: The supply-demand ratio of each elderly care and dining institution is expressed as: Among them, R j,w and R j,p are the supply and demand ratios of the elderly going to the nursing and dining institution j by walking and public transportation, respectively, j is the area of ​​the elderly care and dining assistance institution j.

4. The accessibility evaluation method for elderly care and dining assistance institutions according to claim 3 is characterized in that: The accessibility value of the elderly care and dining assistance institution for each demand point is expressed as: A i =A i,w +A i,p Among them, A i A is the accessibility value of the elderly care and dining assistance institution at demand point i; i,w and A i,p are the accessibility values ​​of the elderly from demand point i to the elderly care and dining assistance institution by walking and public transportation, respectively.

5. A system for evaluating the accessibility of elderly care and dining assistance institutions based on a two-step mobile search method, characterized in that: include: An information acquisition module is used to obtain information on elderly care and dining assistance institutions and demand points; wherein the elderly care and dining assistance institutions at least include elderly canteens and elderly care and dining assistance points; The supply-demand ratio calculation module is used to take the elderly care and dining assistance institution as the center, use the preset time threshold as the search radius, search all demand points within the range, introduce the Gaussian attenuation function, and calculate the supply-demand ratio of each elderly care and dining assistance institution; The accessibility evaluation module is used to take the demand point as the center, use the time threshold as the search radius, sum the supply-demand ratios of all elderly care and dining institutions within the search range, and obtain the accessibility value of the elderly care and dining institution for each demand point.

6. The accessibility evaluation system for elderly care and dining assistance institutions according to claim 5, characterized in that: Taking walking and public transportation as the transportation modes for the elderly to go to the elderly care and dining institutions, the Gaussian attenuation function is expressed as: Among them, G(t ij,w ,t 0,w ) and G(t ij,p ,t 0,p ) are Gaussian attenuation functions corresponding to walking and public transportation respectively; t ij,w and t ij,p and t are the walking time and public transportation time between demand point i and elderly care and dining institution j respectively; 0,w is the time threshold for elderly people to walk between demand point i and elderly care and dining institution j; t 0,p is the time threshold for the elderly to travel by public transportation between demand point i and elderly care and dining institution j, D i is the number of elderly people at demand point i.

7. The accessibility evaluation system for elderly care and dining assistance institutions according to claim 6, characterized in that: The supply-demand ratio of each elderly care and dining institution is expressed as: Among them, R j,w and R j,p are the supply and demand ratios of the elderly going to the nursing and dining institution j by walking and public transportation, respectively, j is the area of ​​the elderly care and dining assistance institution j.

8. The accessibility evaluation system for elderly care and dining assistance institutions according to claim 7, characterized in that: The accessibility value of the elderly care and dining assistance institution for each demand point is expressed as: A o =A i,w +A i,p Among them, A i A is the accessibility value of the elderly care and dining assistance institution at demand point i; i,w and A i,p are the accessibility values ​​of the elderly from demand point i to the elderly care and dining assistance institution by walking and public transportation, respectively.

9. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the processor executes the computer program, the accessibility evaluation method for elderly care and dining assistance institutions based on the two-step mobile search method as described in any one of claims 1 to 4 can be implemented.

10. An electronic device, characterized in that: include: one or more processors; Memory; And one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the programs include a method for executing the accessibility evaluation method of elderly care and dining assistance institutions based on the two-step mobile search method as described in any one of claims 1 to 4.

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