CN112612785A - Dynamic monitoring method for key development path of unconventional energy technology - Google Patents
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Abstract
The invention discloses a dynamic monitoring method for key development paths of an unconventional energy technology, which aims to solve the technical problems that the existing method is strong in subjectivity, low in efficiency, large in uncertainty and not suitable for the forecast and monitoring of the unconventional energy technology with non-progressiveness and explosiveness. The invention relates to the technical field of energy technology forecasting and technology monitoring, which comprises the following steps: collect unconventional energy patent application documents. According to the unconventional energy patent application files, an unconventional energy patent pre-citation database is built, an unconventional energy patent pre-citation matrix is built, and the weight of each directed edge in the unconventional energy patent citation network is obtained through calculation. A dynamic programming algorithm is used to compute full path weights for all paths in the citation network. Selecting and storing an unconventional energy technology development key path according to the full path weight; and dynamically monitoring according to the unconventional energy technology development key path, and outputting an unconventional energy technology development key path evolution diagram.
Description
Technical Field
The invention relates to the technical field of energy technology forecasting and technology monitoring, in particular to a dynamic monitoring method for an unconventional energy technology key development path.
Background
New Energy (NE): also known as unconventional energy sources. Refers to various forms of energy sources other than traditional energy sources. The energy to be popularized is energy which is just developed and utilized or is actively researched, such as solar energy, geothermal energy, wind energy, ocean energy, biomass energy, nuclear fusion energy and the like.
Generally, the conventional energy refers to energy that is technically mature and has been utilized on a large scale, and the new energy refers to energy that has not been utilized on a large scale and is being actively researched and developed. Therefore, coal, oil, natural gas, and medium and large-sized hydropower are regarded as conventional energy sources, and solar energy, wind energy, modern biomass energy, geothermal energy, ocean energy, hydrogen energy, and the like are used as new energy sources. With the development of technology and the establishment of the concept of sustainable development, industrial and domestic organic wastes, which have been regarded as garbage in the past, are newly recognized and deeply researched, developed and utilized as a material for resource utilization of energy, and therefore, the resource utilization of wastes can also be regarded as a form of new energy technology.
Compared with the traditional energy, the development of the unconventional energy technology presents obvious leap and explosion, the traditional technical prediction method mostly depends on expert investigation, the subjectivity is strong, the efficiency is low, the uncertainty is large, and the non-conventional energy technology with non-progressiveness and explosion has the defect of difficult prediction.
Therefore, developing a more accurate and timely monitoring system for the unconventional energy technology, and simultaneously reserving a reasonable planning space for potential breakthrough technology becomes a technical problem to be solved urgently by researchers in the field.
Disclosure of Invention
In view of the above, the invention provides a dynamic monitoring method for key development paths of an unconventional energy technology, so as to solve the technical problems that the existing method is strong in subjectivity, low in efficiency, large in uncertainty and not suitable for the forecast and monitoring of the unconventional energy technology with non-progressiveness and explosiveness.
In order to achieve the purpose, the technical scheme of the invention comprises the following steps:
collect unconventional energy patent application documents.
And constructing an unconventional energy patent citation database according to the unconventional energy patent application file.
And constructing an unconventional energy patent pre-citation matrix according to the unconventional energy patent pre-citation database.
And calculating to obtain the weight of each directed edge in the non-conventional energy patent citation network according to the non-conventional energy patent citation matrix.
And calculating the weight of the whole path for all paths in the citation network by using a dynamic programming algorithm according to the weight of the directed edge.
Selecting and storing an unconventional energy technology development key path according to the full path weight;
and dynamically monitoring according to the unconventional energy technology development key path, and outputting an unconventional energy technology development key path evolution diagram.
Further, collect unconventional energy patent application file, specifically include: and setting the technical name of the unconventional energy as a keyword, and searching and collecting the patent application files of the unconventional energy by using the keyword.
Further, according to the non-conventional energy patent application document, a non-conventional energy patent citation database is constructed, and specifically comprises: according to citation information in the unconventional energy patent application document, a patent pre-citation database containing patent names and all citation information cited correspondingly is constructed; the quotation information comprises quotation names, abstracts, quotation public time and keywords thereof.
Further, according to the database of the unconventional energy patent citation, constructing an unconventional energy patent citation matrix, specifically comprising:
according to the patent citation database, the patent citation relation network is expressed as a citation matrix, and an element P in the citation matrixijShowing the directional reference of patent i to patent j in patent citation database.
The directed reference case specifically includes: when P is presentijThe assignment is 1, indicating that patent j refers to patent i, i.e., there is a directed edge pointing from patent i to patent j. When P is presentijWhen the value is 0, the method indicates that there is no reference relationship between the patent j and the patent i and no directed edge exists.
Further, according to the unconventional energy patent citation matrix, calculating to obtain the weight of each directed edge in the unconventional energy patent citation network, specifically comprising:
calculating the number of times of application of the patent V according to the unconventional energy patent pre-citation matrix and marking as V+(v)(V+(v) ≧ 0), the number of patents cited by patent V while counting other patents is noted as V-(v)(V-(v)≥0)；
When V is+(v) When being equal to 0, the patent v is a leading-edge patent in the current technical development path; when V is-(v) When 0, the patent v is the initial patent of a technical development path;
the directed edge weight specifically includes:
W(eij)＝[V+(i)+1]×[V+(j)+1]
wherein e isijDenotes a directed edge, W (e), in the citation network pointing from patent i to patent jij) Denotes eijIs weighted.
Further, according to the directed edge weight, calculating the total path weight of all paths in the citation network by using a dynamic programming algorithm, specifically comprising:
any initial patent on a technical development path is marked as s; the corresponding leading edge patent in the current technical development path is marked as t; wherein n reachable technical development paths are provided from s to t, and n is more than or equal to 1.
And aiming at the reachable technology development path, summing all the directed edge weights on the path, and recording the obtained result as the full path weight of the reachable technology development path.
Further, selecting and storing the unconventional energy technology development key path according to the full path weight specifically comprises:
calculating n total path weights of the reachable technical development paths from the patent s to the patent tn according to the total path weights, and recording the n total path weights as an s-to-t technical development total path weight set PWs～t(ii) a Full path weight set PW for technology development from s to ts～tThe path corresponding to the maximum value is selected, and the path is a technical development critical path from the original patent s to the leading-edge patent t.
Storing all key patent information and directed edges on a technical development key path; all patents on the key path of the technology development are key patents; the key patent information specifically includes the name, abstract, IPC patent classification number, keywords and publication time of the key patent.
Further, according to the key path of the non-conventional energy technology development, dynamic monitoring is performed, and a non-conventional energy technology development key path evolution diagram is output, which specifically comprises: and updating and monitoring the unconventional energy technology development key path at regular time, and outputting a visualized unconventional energy technology development key path evolution diagram according to the stored key path and the key patent information on the key path.
Furthermore, all patents in a path are path nodes, the initial patent is an initial node, if a directed edge exists between two patents and the directed edge points to patent j from patent i, patent i is a parent node, and j is a child node.
According to the directed edge weight, calculating the total path weight of all paths in the citation network by using a dynamic programming algorithm, and specifically adopting the following process:
and S1, creating a stack and pushing all nodes into the stack.
And S2, accessing a stack top node and marking as a node C.
S3, judging whether the node C has been accessed, if yes, entering S4, otherwise entering S5.
S4, acquiring the path with the maximum full path weight from the path list of the node C, and adding the path with the maximum full path weight into the path list of the father node P of the node C; s8 is executed.
And S5, judging whether the node C has child nodes, if so, entering S6, and otherwise, entering S7.
S6, judging whether all child nodes of the node C are accessed, if yes, calculating and acquiring the maximum value of the full path weight in the path list of the node C, and marking the node C as accessed; execution of S8;
if all children of node C have not been visited, then all children of node C are pushed onto the stack and all children that are pushed onto the stack are marked as parent node C, returning to S2.
S7, taking the node C as a key point, calculating the path length between the node C and the current father node P, and adding a path to the node C in the path list of the father node P; marking node C as visited, S8 is performed.
S8, popping the node C; and judging whether the stack is empty, if so, ending the process, and otherwise, returning to the step S2.
Has the advantages that:
the invention constructs the unconventional energy patent citation database according to the citation information of the patent application files by acquiring the unconventional energy patent application files, constructs the unconventional energy patent citation matrix according to the unconventional energy patent citation database, simultaneously calculates each directed edge weight in the unconventional energy patent citation network, then calculates the total path weight of all paths in the citation network by using a dynamic programming algorithm, selects and stores the unconventional energy technology development key path according to the calculated total path weight, finally dynamically monitors the obtained unconventional energy technology development key path and outputs the unconventional energy technology development key path evolution diagram, has the advantages of high automation degree, strong objectivity, low uncertainty, high efficiency and the like, and can realize the unconventional energy key technology monitoring, provides direction guidance for the long-term layout of the unconventional energy technology.
Drawings
Fig. 1 is a flowchart of a dynamic monitoring method for a key development path of an unconventional energy technology according to an embodiment of the present invention;
FIG. 2 shows the key path evolution diagrams of the technical development outputted by the embodiment of the present invention;
fig. 3 is a schematic flow chart of calculating the total path weight for all paths in the citation network by using the dynamic programming algorithm in the embodiment of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a
The invention aims to provide a dynamic monitoring method for key development paths of an unconventional energy technology, and aims to solve the technical problems that the existing method is strong in subjectivity, low in efficiency, large in uncertainty and not suitable for the forecast and monitoring of the unconventional energy technology with non-progressiveness and explosiveness.
In order to make the aforementioned, characteristic, object and advantages of the present invention more comprehensible and operable, the present invention is described in further detail below with reference to the accompanying drawings of specific embodiments and examples.
Fig. 1 is a flowchart illustrating a method for dynamically monitoring a critical development path of an unconventional energy technology according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps
101. Acquiring an unconventional energy patent application document; and setting the technical name of the unconventional energy as a keyword, and searching and collecting the patent application files of the unconventional energy by using the keyword.
102. Constructing an unconventional energy patent pre-citation database according to the unconventional energy patent application files; according to citation information in the unconventional energy patent application document, a patent pre-citation database containing patent names and all citation information cited correspondingly is constructed; the quotation information comprises quotation names, abstracts, quotation public time and keywords thereof.
103. Constructing an unconventional energy patent pre-citation matrix according to the unconventional energy patent pre-citation database; according to the introduction to the patentA database for representing the patent citation relation network as a citation matrix, wherein the element P in the citation matrixijShowing the directional citation condition of patent i by patent j in the patent citation database; the directed reference case specifically includes: when P is presentijThe assignment is 1, indicating that patent j refers to patent i, i.e., there is a directed edge pointing from patent i to patent j. When P is presentijWhen the value is 0, the method indicates that there is no reference relationship between the patent j and the patent i and no directed edge exists.
104. And calculating to obtain the weight of each directed edge in the non-conventional energy patent citation network according to the non-conventional energy patent citation matrix.
Calculating the number of times of application of the patent V according to the unconventional energy patent pre-citation matrix and marking as V+(v)(V+(v) ≧ 0), the number of patents cited by patent V while counting other patents is noted as V-(v)(V-(v)≥0)。
When V is+(v) When being equal to 0, the patent v is a leading-edge patent in the current technical development path; when V is-(v) When 0, patent v is the initial patent of a path of technology development.
The directed edge weight specifically includes:
W(eij)＝[V+(i)+1]×[V+(j)+1]
wherein e isijDenotes a directed edge, W (e), in the citation network pointing from patent i to patent jij) Denotes eijIs weighted.
105. And calculating the weight of the whole path for all paths in the citation network by using a dynamic programming algorithm according to the weight of the directed edge.
Any initial patent on a technical development path is marked as s; the corresponding leading edge patent in the current technical development path is marked as t; wherein n reachable technical development paths are provided from s to t, and n is more than or equal to 1;
and aiming at the reachable technology development path, summing all the directed edge weights on the path, and recording the obtained result as the full path weight of the reachable technology development path.
106. And selecting and storing the unconventional energy technology development key path according to the full path weight.
Calculating n total path weights of the reachable technical development paths from the patent s to the patent tn according to the total path weights, and recording the n total path weights as an s-to-t technical development total path weight set PWs～t。
Full path weight set PW for technology development from s to ts～tThe path corresponding to the maximum value is selected, and the path is a technical development critical path from the original patent s to the leading-edge patent t.
Storing all key patent information and directed edges on a technical development key path; all patents on the critical path of technology development are key patents.
The key patent information specifically includes the name, abstract, IPC patent classification number, keywords and publication time of the key patent.
107. And dynamically monitoring according to the unconventional energy technology development key path, and outputting an unconventional energy technology development key path evolution diagram. And updating and monitoring the unconventional energy technology development key path at regular time, and outputting a visualized unconventional energy technology development key path evolution diagram according to the stored key path and the key patent information on the key path.
Fig. 3 provides a flow chart for calculating the total path weight for all paths in the citation network by using a dynamic programming algorithm, where all patents in one path are path nodes, the initial patent is an initial node, and if a directed edge exists between two patents and points to patent j from patent i, patent i is a parent node, and j is a child node. The method specifically adopts the following steps:
and S1, creating a stack and pushing all nodes into the stack.
And S2, accessing a stack top node and marking as a node C.
S3, judging whether the node C has been accessed, if yes, entering S4, otherwise entering S5.
S4, acquiring the path with the maximum full path weight from the path list of the node C, and adding the path with the maximum full path weight into the path list of the father node P of the node C; s8 is executed.
And S5, judging whether the node C has child nodes, if so, entering S6, and otherwise, entering S7.
S6, judging whether all child nodes of the node C are accessed, if yes, calculating and acquiring the maximum value of the full path weight in the path list of the node C, and marking the node C as accessed; execution of S8;
if all children of node C have not been visited, then all children of node C are pushed onto the stack and all children that are pushed onto the stack are marked as parent node C, returning to S2.
S7, taking the node C as a key point, calculating the path length between the node C and the current father node P, and adding a path to the node C in the path list of the father node P; marking node C as visited, S8 is performed.
S8, popping the node C; and judging whether the stack is empty, if so, ending the process, and otherwise, returning to the step S2.
Specifically, the embodiment of the present invention is described in detail by taking an unconventional natural gas, namely shale gas, as an example. The method comprises the following steps:
step 101: collecting shale gas patent application files;
step 102: constructing a shale gas patent pre-citation database according to a shale gas patent application file;
step 103: constructing a shale gas patent pre-citation matrix according to a shale gas patent pre-citation database;
step 104: calculating the weight of each directed edge in the shale gas patent citation network according to the shale gas patent citation matrix;
step 105: calculating the weight of all paths in the citation network by using a dynamic programming algorithm according to the weight of the directed edge;
step 106: selecting and storing a shale gas technology development key path according to the full path weight;
step 107: and dynamically monitoring according to the shale gas technical development key path, and outputting a shale gas technical development key path evolution diagram.
The following steps are described in detail:
in step 101, collecting shale gas patent application documents specifically includes:
collecting and acquiring patent application documents containing the shale gas technical name keywords, or collecting and acquiring papers or government announcements and government documents containing the shale gas technical name keywords, and the like.
The collection and acquisition of the relevant documents are performed in patent databases such as but not limited to a Derwent world index database, a world intellectual property database, a European patent office database, a United states patent and trademark office database, and a Chinese national intellectual property office database.
The retrieval mode adopts input keyword retrieval, which is exemplified by shale gas technology (an unconventional natural gas), and the input retrieval keywords comprise "share responses, share gas, share layers, share formats" and the like, wherein the keywords are connected by "logic or" (or) in a boolean operator. Furthermore, the method of the present invention is applicable to any subject retrievals.
In step 102, according to the shale gas patent application document, a shale gas patent citation database is constructed, which specifically comprises:
according to the citation information in the patent application document, a patent pre-citation database containing the patent name and all citation information cited correspondingly is constructed; the quotation information comprises the name, abstract, quotation disclosure time and keywords of the quotation.
In step 103, a shale gas patent citation matrix is constructed according to the shale gas patent citation database, specifically including representing a complex patent citation relationship network as a citation matrix P, which represents a directed graph, and each patent is represented as a node in the directed graph. Element P in the citation matrix PijIndicating the patent j has a directed reference to the patent i; if patent j refers to patent i, then PijThe value is 1, indicating that there is a directed edge pointing from patent (node) i to patent (node) j. If there is no reference between the two patents, PijThe value is assigned to 0, indicating that there is no directed edge between the two patents (nodes).
Specifically, in step 104, calculating the weight of each directed edge in the shale gas patent citation network according to the shale gas patent citation matrix, and specifically includes:
calculating the number of times of application of the patent V according to the value of the element in the shale gas patent citation matrix, and marking as V+(v)(V+(v) ≧ 0), the number of patents cited by patent V while counting other patents is noted as V-(v)(V-(v)≥0)；
When V is+(v) When the value is 0, the patent v is the initial patent of a technology development path, namely, the basic technology in the current technology development path;
when V is-(v) When being equal to 0, the patent v is a leading-edge patent in the current technical development path, namely, the leading-edge technology in the current technical development path;
the specific calculation formula of the directed edge weight is as follows:
W(eij)＝[V+(i)+1]×[V+(j)+1]
wherein e isijDenotes a directed edge, W (e), in the citation network pointing from patent (node) i to patent (node) jij) Representing directed edges eijThe weight of (c).
In step 105, according to each directional edge weight obtained in step 104, calculating a full path weight for all paths in the citation network by using a dynamic programming algorithm, which specifically includes:
assuming that any initial patent is s and the terminal patent is t; wherein n reachable technical development paths (n is more than or equal to 1) are provided from s to t; and aiming at each path in the n technical development paths, summing all the directed edge weights on the path, and recording the obtained result as the full path weight of the path.
In step 106, according to the full path weights obtained in step 105, n full path weights of the reachable technology development paths from s to tn are obtained in a summary manner, and are recorded as an s-to-t technology development full path weight set PWs～t；
Full path weight set PW for technology development from s to ts～tThe path corresponding to the maximum value is selected, and the path is a technical development critical path from the original patent s to the leading-edge patent t.
Storing all key patent information and directed edges on a technical development key path; if there are two or more than two technical development critical paths with the same maximum full path weight value, all the technical development critical paths are reserved and stored.
The key patent information specifically includes the name, abstract, IPC patent classification number, keywords and publication time of the key patent.
Specifically, in step 107, dynamically monitoring the stored shale gas technical development critical path, and outputting a shale gas technical development critical path evolution diagram, as shown in fig. 2(a), 2(b), and 2(c), specifically including: and updating and monitoring the shale gas technology development key path at regular time, and outputting a visual shale gas technology development key path evolution diagram according to the stored key path and the key patent information thereon.
Fig. 2(a), fig. 2(b) and fig. 2(c) are evolution diagrams of the identified key path of shale gas technology development from 1960 to 2005, 2010 and 2016, respectively, using the technical solution proposed by the present invention. In this embodiment, the database for obtaining the patent application document is a delta world index database, dynamic monitoring of key paths for technical development is performed on a shale gas technology (an unconventional natural gas technology), 9 key paths for technical development of shale gas are dynamically monitored from a complex shale gas patent citation network, and 9 types of key technology clusters are respectively designed: the method comprises the steps of in-situ conversion process technology, yield increasing treatment by heating or liquid, organic matter extraction from underground shale stratum, underground reservoir treatment, oil shale dry distillation technology, compound separation by using adsorbent, well site shale gas exploitation method, reservoir identification and characteristic analysis, shale gas resource/reserve measurement method, organic carbon content calculation method and device.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
The content and the embodiment of the method of the invention are explained in detail by applying specific shale gas technical examples, and the description of the examples is only used for helping to understand the core idea and the specific operation steps of the invention; meanwhile, for those skilled in the art, the core idea of the present invention may be different in the specific implementation and application scope. Accordingly, the subject matter of this specification should not be construed as limiting the invention.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A dynamic monitoring method for key development paths of unconventional energy technology is characterized by comprising the following steps:
acquiring an unconventional energy patent application document;
constructing an unconventional energy patent pre-citation database according to the unconventional energy patent application file;
constructing an unconventional energy patent pre-citation matrix according to the unconventional energy patent pre-citation database;
calculating to obtain the weight of each directed edge in the non-conventional energy patent citation network according to the non-conventional energy patent citation matrix;
calculating the weight of all paths in the citation network by using a dynamic programming algorithm according to the weight of the directed edge;
selecting and storing an unconventional energy technology development key path according to the full path weight;
and according to the unconventional energy technology development key path, carrying out dynamic monitoring and outputting an unconventional energy technology development key path evolution diagram.
2. The method for dynamically monitoring the key development path of the unconventional energy technology according to claim 1, wherein the acquiring of the unconventional energy patent application file specifically comprises:
and setting the technical name of the unconventional energy as a keyword, and searching and collecting the patent application document of the unconventional energy by using the keyword.
3. The method for dynamically monitoring the key development path of the unconventional energy technology according to claim 1, wherein the constructing a database of the pre-citation of the unconventional energy patent according to the unconventional energy patent application document specifically comprises:
according to the citation information in the unconventional energy patent application document, a patent pre-citation database containing patent names and all citation information cited correspondingly is constructed;
the quotation information comprises quotation names, abstracts, quotation public time and keywords thereof.
4. The method for dynamically monitoring the key development path of the unconventional energy technology according to claim 1, wherein the constructing of the unconventional energy patent citation matrix according to the unconventional energy patent citation database specifically comprises:
representing the patent citation relation network as a citation matrix according to the patent citation database, wherein elements P in the citation matrixijRepresenting the patent i in patent citation database with patent j as a directed citation;
the directed reference case specifically includes: when P is presentijThe assignment is 1, indicating that patent j refers to patent i, i.e., there is a directed edge pointing from patent i to patent j. When P is presentijWhen the value is 0, the method indicates that there is no reference relationship between the patent j and the patent i and no directed edge exists.
5. The method for dynamically monitoring the key development path of the unconventional energy technology according to claim 1, wherein the calculating, according to the unconventional energy patent citation matrix, the weight of each directed edge in the unconventional energy patent citation network specifically includes:
calculating the number of times of application of the patent V according to the unconventional energy patent citation matrix and marking as V+(v)(V+(v) ≧ 0), the number of patents cited by patent V while counting other patents is noted as V-(v)(V-(v)≥0)；
When said V is+(v) When being equal to 0, the patent v is a leading-edge patent in the current technical development path;
when said V is-(v) When 0, the patent v is the initial patent of a technical development path;
the directed edge weight specifically includes:
W(eij)＝[V+(i)+1]×[V+(j)+1]
wherein e isijDenotes a directed edge, W (e), in the citation network pointing from patent i to patent jij) Denotes eijIs weighted.
6. The method for dynamically monitoring the unconventional energy technology key development path according to claim 1, wherein the calculating of the total path weight for all paths in the citation network by using a dynamic planning algorithm according to the directed edge weight specifically comprises:
any initial patent on the one technology development path is marked as s; the corresponding leading edge patent in the current technology development path is marked as t; wherein n reachable technical development paths are provided from s to t, and n is more than or equal to 1;
and aiming at the reachable technical development path, summing all the directed edge weights on the path, and recording the obtained result as the full path weight of the reachable technical development path.
7. The method according to claim 1, wherein the selecting and storing the unconventional energy technology development critical path according to the full path weight specifically comprises:
according to the full path weight, calculating n full path weights of the n reachable technical development paths from the patent s to t, and recording the n full path weights as an s-to-t technical development full path weight set PWs～t；
Developing full path weight set PW from said s-to-t techniques～tSelecting a path corresponding to the maximum value, wherein the path is a technical development key path from the original patent s to the leading edge patent t;
storing all key patent information and directed edges on the technical development key path; all patents on the key path of the technology development are key patents;
the key patent information specifically comprises the name, abstract, IPC patent classification number, keywords and publication time of the key patent.
8. The method according to claim 1, wherein the dynamically monitoring and outputting the evolving critical path diagram of the unconventional energy technology comprises:
and updating and monitoring the unconventional energy technology development key path at regular time, and outputting a visualized unconventional energy technology development key path evolution diagram according to the stored key path and the key patent information on the key path.
9. The method according to claim 6, wherein all patents in a path are path nodes, the initial patent is an initial node, if there is an oriented edge between two patents pointing from patent i to patent j, then patent i is a parent node, j is a child node;
and according to the directed edge weight, calculating the total path weight of all paths in the citation network by using a dynamic programming algorithm, and specifically adopting the following process:
s1, building a stack, and pressing all nodes into the stack;
s2, accessing a stack top node, and marking as a node C;
s3, judging whether the node C is accessed, if yes, entering S4, otherwise, entering S5;
s4, acquiring the path with the maximum full path weight from the path list of the node C, and adding the path with the maximum full path weight into the path list of the father node P of the node C; execution of S8;
s5, judging whether the node C has child nodes, if yes, entering S6, and if not, entering S7;
s6, judging whether all child nodes of the node C are accessed, if yes, calculating and acquiring the maximum value of the full path weight in the path list of the node C, and marking the node C as accessed; execution of S8;
if all the child nodes of the node C are not completely accessed, pushing all the child nodes of the node C to the stack, marking all the child nodes for pushing the stack as parent nodes as the node C, and returning to the step S2;
s7, taking the node C as a key point, calculating the path length between the node C and the current father node P, and adding a path to the node C in the path list of the father node P; marking node C as visited, go to S8;
s8, popping the node C; and judging whether the stack is empty, if so, ending the process, and otherwise, returning to the step S2.
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