CN108376310A - Building fire risk class appraisal procedure - Google Patents

Building fire risk class appraisal procedure Download PDF

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CN108376310A
CN108376310A CN201810119077.9A CN201810119077A CN108376310A CN 108376310 A CN108376310 A CN 108376310A CN 201810119077 A CN201810119077 A CN 201810119077A CN 108376310 A CN108376310 A CN 108376310A
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霍元
王强
任天宇
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Shenzhen Qianhai Daguan Information Technology Co Ltd
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Abstract

The invention discloses a kind of building fire risk class appraisal procedures, including obtain the corresponding default risk assessment index of the target construction;Carry out default value pretreatment;It is cluster number of clusters according to preset design fire risk class, clustering processing acquisition cluster result is carried out to carrying out the pretreated building data by k prototypes clustering algorithm;Classification prediction is carried out on the cluster result by least one machine learning classification algorithm, determines whether the classification prediction result that the cluster result carries out above reaches preset accuracy;According to cluster result classification building data and the preset design fire risk class, graded to the fire risk of the target construction using J48 decision trees, output level of building fire risk decision rule;When there is new building to build up, the level of building fire risk of building can be assessed by decision rule, to help fire-fighting supervision department to realize Precision management, emphasis prevention and control.

Description

Building fire risk class appraisal procedure
Technical field
The present invention relates to public fire protection security technology areas, and in particular to a kind of building fire risk class assessment side Method.
Background technology
The management of fire safety work of most of social unit for many years be generally " responsibility on wall, checked on paper, fire it is hidden Trouble is important but not urgent thing " state, the main reason is that the papery fire archieves due to generally using and emphasis list The management of fire safety tools such as position residence management system can not effectively assist social unit to implement security against fire responsibility, improve Security against fire self-service supportability.
In addition, since the scale of present Tall Office Building is increasing, construction is complicated, in construction style, style, function etc. Aspect is different, and with new technology, the application of new material and new building structure so that building space construction area increases Greatly, electrical equipment increases, and fire hazard becomes larger.Modern architecture and traditional architecture construction material, space size, structure type, Auxiliary facility is very different using the various aspects of function, its fire is made to have following features:The intensity of a fire is swift and violent, and sprawling is rapid; Building interior is complicated, and evacuating personnel is difficult;Fire fighting and rescue difficulty is big.
Therefore, for determining and elimination fire hazard, it is necessary to study fire safety evaluation technology, improve fire assessment body System.However, current fire safety evaluation method evaluation index is single, starts with mostly from one-sided factor, do not consider Influence of the different aspect factor to evaluation result, it is not accurate enough and comprehensive.
Currently, both at home and abroad associated mechanisms or it is personal developed many Fire risk assessment methods, from the angle of methodology, It is broadly divided into qualitative method, semiquantitative method and sizing technique.
Qualitative method in Fire risk assessment method is mainly used for identifying that least favorable event of fire, main method have safety Checking list method, classification of risks indicator method (Risk Category Indicator Method), risk assessment inspection table of setting on fire Method (Arson Risk Assessment Checklist) etc..Such methods are mainly to comment with the pertinent regulations of specification or regulations Sentence foundation, fire risk feature is determined in a simple manner decoupled, to take mandatory mode to solve the problems, such as security against fire.
Semi-quantitative method in Fire risk assessment method is mainly used for determining the relative risk of fire, also referred to as fire wind Dangerous staging.Compare the risky value matrix method of typical method (Risk Value Matrix Method), fire Safety Assessment System (Fire Safety Evaluation System) method, specific commercial property assessment table (Specific Commercial Property Evaluation Schedule) method, Dow fire explosion index (Dow Fire and Explosion Index) method, fire size class stratification (Hierarchical Approach), SIA81-Gretener methods, fire risk index Method (Fire Risk Index Method) etc..For semiquantitative method due to the feature that its is fast and simple, structuring is strong, application is more wide It is general.Disadvantage is however that for specific type building, process exploitation, do not have universality, especially factor selection and weight is true It is fixed;In addition, evaluation result and the accumulation of the know-how, experience and relevant historical data of method developer etc. are closely related, tool There is certain subjectivity.
Quantitative approach in Fire risk assessment method is mainly used for determining the practical risk of fire, by specific false If, data and mathematical, retrospect generates quantized result and simultaneously reflects potential fire risk distribution, also referred to as probabilistic method.Than More typical method has:
CRISP (Computation of Risk Indices by Simulation Procedures) method,
FiRECAM (Fire Risk Evaluation and Cost Assessment Model) method,
BFSEM methods (The Building Fire Safety Engineering Method),
Fire evaluate and risk assessment (Fire Evaluation and Risk Assessment) method,
Risk analysis event tree method,
β reliable indicator fire risk assessment methods etc..
Such methods advantage is that result reflects the uncertain essence of risk, the disadvantage is that need a large amount of data information and when Between.
It is not ten thousand that advantage and disadvantage by analyzing the above all kinds of methods, which can be seen that any type Fire risk assessment method, Can, it is all based on specific application and background and generates, there is the specific scope of application, the particular problem being directed at it and field There is preferable applicability in scape application range.In concrete practice, in the case where existing method is unable to meet demand, evaluator The difference according to purpose of appraisals, assessment object, evaluation stage etc. is often needed, and the moneys such as human and material resources, financial resources that can be grasped Source situation invents suitable Fire risk assessment method.
How the fire risk state of building is effectively assessed, and how to evaluate building fire risk class is always fire-fighting The key points and difficulties of management of safe operation.Therefore, it is necessary to which it is next to provide a kind of new building fire risk class appraisal procedure Solve above-mentioned technical problem.
Invention content
The main purpose of the present invention is to provide a kind of simple and effective building fire risk class appraisal procedures.
To achieve the above object, the present invention provides a kind of building fire risk class appraisal procedure, including step:
According to the data of target construction, the corresponding default risk assessment index of the target construction is obtained;
Default value pretreatment is carried out to the default risk assessment index of acquisition, obtains pretreated building number According to;
It is cluster number of clusters according to preset design fire risk class, by k- prototypes clustering algorithm to carrying out the pre- place Building data after reason carry out clustering processing and obtain cluster result;
Classification prediction is carried out on the cluster result by least one machine learning classification algorithm, is determined described poly- Whether the classification prediction result that class result carries out above reaches preset accuracy;
When the classification prediction result carried out on the cluster result reaches preset accuracy, tied according to cluster The other building data of fruit and the preset design fire risk class, using J48 decision trees to the target structures The fire risk of object is graded.
Further, the data according to target construction obtain the corresponding default risk of the target construction and comment The step of estimating index, including:
According to the data dimension of the data of target construction, the default of the corresponding data dimension of the target construction is obtained Risk assessment index.
Further, the default risk assessment index of the corresponding data dimension includes at least one in following attribute value Kind:
8 numerical attributes or Continuous valued attributes, including:A1 builds age, A2 index beds area, the total face of A3 refuge stories The same time can accommodate maximum number, A7 building heights and the undergrounds A8 in product, A4 aerial layers area, A5 construction areas, A6 building Level is accumulated;And
10 symbol attributes or discrete value attribute, including:The grounds the B1 number of plies, the undergrounds the B2 number of plies, B3 Fire lifts number, B4 It takes refuge layer number, B5 buildings classification, B6 building structure, the whether voluminous power of B7, B8 fire resistance ratings, B9 construction status value and B10 rows Administrative division domain.
Further, the default risk assessment index of described pair of acquisition carries out default value pretreatment, is pre-processed The step of rear building data, including:
When the attribute value of the default risk assessment index is discrete type, default value is positioned as the default risk and is commented Estimate the highest attribute value of frequency of occurrence in index;And/or
When the attribute value of the default risk assessment index is continuous type, default value is positioned as the default risk and is commented Estimate the mean value of the attribute value in index.
Further, the preset design fire risk class is 3 grades or 4 grades.
Further, it is described according to preset design fire risk class be cluster number of clusters, pass through k- prototype clustering algorithms The step of clustering processing obtains cluster result is carried out to carrying out the pretreated building data, including:
It is cluster number of clusters according to preset design fire risk class, adjustment k- prototypes cluster sample similarity measure formulas In the numerical value of undetermined parameter τ that contains, pass through k- prototypes clustering algorithm and carried out to carrying out the pretreated building data Clustering processing.
Further, it is described carry out classifying on the cluster result by least one machine learning classification algorithm it is pre- It surveys, determines the step of whether the classification prediction result that the cluster result carries out above reaches preset accuracy, including:
The machine learning classification algorithm in 8 kinds of WEKA kits is used on the cluster result to being added to classification The building data of information carry out class test;
Wherein, the machine learning classification algorithm includes:It is Bayesian network, random tree, naive Bayesian, SMO, random gloomy Woods, J48, NBTree and RBF net.
Further, described to reach preset accuracy to reach 90% or more accuracy.
Further, the default risk assessment index of the corresponding data dimension includes:
5 Continuous valued attributes:A1 building ages, A2 index beds area, A5 construction areas, A6 buildings interior same time can hold Receive maximum number, A7 building heights;And
1 discrete type attribute:B3 Fire lift numbers.
Further, [A1 build age≤15.5 year] and [building height≤64.5 meter A7] and [in A6 buildings same Time can accommodate the people of maximum number≤5900] and [A2 index beds area≤60519 square metre] and [A5 construction areas≤ 189848.5 square metres], it is determined that [fire risk=light grade];
At [the A1 building ages>15.5] and [building height≤72.45 meter A7] and [A6 building in the same time can accommodate The people of maximum number≤7600], it is determined that [fire risk=middle rank];
At [the A1 building ages>15.5] and [building height≤72.45 meter A7] and [A6 building in the same time can accommodate Maximum number>7600 people], it is determined that [fire risk=serious grade]
In [A1 builds age≤15.5 year] and [building height≤64.5 meter A7] and [the same time can accommodate in A6 buildings Maximum number>5900 people], it is determined that [fire risk=serious grade];
At [the A1 building ages>15.5] and [A7 building heights>72.45 meters] and [Fire lift number=1 or 2], Then determine [fire risk=serious grade].
In the inventive solutions, it by the data according to target construction, obtains the target construction and corresponds to Default risk assessment index;Default value pretreatment is carried out to the default risk assessment index of acquisition, after being pre-processed Building data;It is cluster number of clusters according to preset design fire risk class, by k- prototypes clustering algorithm to carrying out institute It states pretreated building data and carries out clustering processing acquisition cluster result;Existed by least one machine learning classification algorithm Classification prediction is carried out above the cluster result, determines whether the classification prediction result that the cluster result carries out above reaches pre- If accuracy;When the classification prediction result carried out on the cluster result reaches preset accuracy, according to poly- The building data of class result classification and the preset design fire risk class, using J48 decision trees to the target The fire risk of building is graded, and level of building fire risk decision rule is outputed;When there is new building to build up, can lead to Decision rule is crossed to assess the level of building fire risk of building, Precision management, emphasis are anti-to help fire-fighting supervision department to realize Control.
Description of the drawings
Fig. 1 is the flow chart of the building fire risk class appraisal procedure in one embodiment of the invention;
Fig. 2 is the corresponding k- prototypes cluster result in τ=0.0009 on building data set after pre-processing;
Fig. 3 is the corresponding k- prototypes cluster result in τ=0.0010 on building data set after pre-processing;
Fig. 4 is the decision tree that J48 algorithms generate on τ=0.0009 and=3 corresponding cluster results;
Fig. 5 is the decision tree that J48 algorithms generate on the cluster result corresponding with K=4 of τ=0.0009;
Fig. 6 is the decision tree that J48 algorithms generate on the cluster result corresponding with K=3 of τ=0.0010;
Fig. 7 is the decision tree that J48 algorithms generate on the cluster result corresponding with K=4 of τ=0.0010.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Base Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that institute's directional instruction (such as up, down, left, right, before and after, transverse direction, diameter in the embodiment of the present invention To, it is horizontal, vertical ...) be only used for explaining under a certain particular pose (as shown in the picture) the relative position pass between each component System, motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes correspondingly.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as It indicates or implies its relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " first ", The feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple " contain Justice is at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. shall be understood in a broad sense, For example, " fixation " may be a fixed connection, it may be a detachable connection, or integral;It can be mechanical connection, can also be Electrical connection;It can be directly connected, can also can be indirectly connected through an intermediary the connection inside two elements or two The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
In addition, the technical solution between each embodiment of the present invention can be combined with each other, but must be general with this field Logical technical staff can be implemented as basis, will be understood that when the combination of technical solution appearance is conflicting or cannot achieve this The combination of technical solution is not present, also not the present invention claims protection domain within.
Referring to FIG. 1, to provide a kind of building fire risk class appraisal procedure 101 in one embodiment of the invention Method flow diagram, the building fire risk class appraisal procedure 101 include the following steps:
Step S10 obtains the corresponding default risk assessment of the target construction and refers to according to the data of target construction Mark.
It is possible to further which according to the data dimension of the data of target construction, it is corresponding to obtain the target construction The default risk assessment index of data dimension.
The default risk assessment index of the corresponding data dimension includes at least one of following attribute value:
8 numerical attributes or Continuous valued attributes, including:A1 builds age, A2 index beds area, the total face of A3 refuge stories The same time can accommodate maximum number, A7 building heights and the undergrounds A8 in product, A4 aerial layers area, A5 construction areas, A6 building Level is accumulated;And
10 symbol attributes or discrete value attribute, including:The grounds the B1 number of plies, the undergrounds the B2 number of plies, B3 Fire lifts number, B4 It takes refuge layer number, B5 buildings classification, B6 building structure, the whether voluminous power of B7, B8 fire resistance ratings, B9 construction status value and B10 rows Administrative division domain.
Specifically, in an optional embodiment, the default risk assessment index of the corresponding data dimension includes:
5 Continuous valued attributes:A1 building ages, A2 index beds area, A5 construction areas, A6 buildings interior same time can hold Receive maximum number, A7 building heights;And
1 discrete type attribute:B3 Fire lift numbers.
Step S20 carries out default value pretreatment to the default risk assessment index of acquisition, obtains pretreated build Build object data.
Further, it in the step 20, when the attribute value of the default risk assessment index is discrete type, will lack Province's value is positioned as the highest attribute value of frequency of occurrence in the default risk assessment index;
When the attribute value of the default risk assessment index is continuous type, default value is positioned as the default risk and is commented Estimate the mean value of the attribute value in index.
Due to containing a large amount of default value in the building initial data of acquisition, existing machine learning algorithm can not be direct Effectively handle the data containing default value, it is therefore necessary to be pre-processed to original building data, to ensure data Completeness.The building data containing default value are pre-processed using statistical method, the default value in data is carried out Estimation and supplement.
Specifically, containing a large amount of default value, including discrete and continuous default value in original building data, herein Discrete and continuous default value is estimated and supplemented respectively using following method.Assuming that attribute AmIt is right on data set D The value answered is { x1m, x2m... ..., xNm, such as x1mFor a default value, work as AmFor discrete value attribute when, Wo Menling x1m={ x2m... ..., xNmPattern (mode), i.e. { x2m... ..., xNmIn the maximum attribute value of frequency of occurrence;
Work as AmFor Continuous valued attributes when, we enable x1m={ x2m... ..., xNmMean value (mean), i.e.,
For example, for Category Attributes value:
{ #, Sunny, Sunny, Sunny, Overcast, Overcast, Rainy, Rainy, Rainy, Rainy } is used Rainy makes up default value " # ", because the frequency that Rainy occurs in the data set is 4;
For continuous property { #, 90,78,96,80,70,65,95,70,80,70,90,75,80 }, useMake up default value " # ".
Step S30 is cluster number of clusters according to preset design fire risk class, by k- prototypes clustering algorithm to carrying out The pretreated building data carry out clustering processing and obtain cluster result.
Further, in step s 30, it is cluster number of clusters according to preset design fire risk class, for example, setting fire Calamity risk class is divided into three-level (light grade, middle rank and serious grade) or level Four (I grades, II grades, III level and IV grades), then corresponds to The number of cluster be 3 or 4, the numerical value of undetermined parameter τ contained in adjustment k- prototypes cluster sample similarity measure formulas leads to It crosses k- prototypes clustering algorithm and carries out clustering processing to carrying out the pretreated building data.
In order to determine the level of building fire risk of building, by find building data in general character contact, to building Data carry out sub-clustering, ensure that the similitude of data in cluster is maximum, the similitude of data is minimum between cluster.This appraisal procedure is former using k- Type cluster clusters the building data of mixed attributes, to effectively distinguish the fire risk of different building data.
Specifically, building data after obtaining pretreatment, poly- by using k- prototypes (k-prototypes) Building data are divided into different clusters by class algorithm, and the determination of cluster number can be adjusted according to the needs of practical application, if Determine level of building fire risk and is divided into three-level (light grade, middle rank and serious grade) or level Four (I grades, II grades, III level and IV grades), it is right The number for the cluster answered is 3 or 4.K- prototypes are clustered containing there are one undetermined parameter τ in sample similarity measure formulas, which uses In adjustment Continuous valued attributes and the influence measured to sample similarity of discrete value attribute, in analysis below we demonstrate τ= 0.0009 and τ=0.0010 pair k- prototype cluster results influence.
Under request in person together combine Fig. 2 and Fig. 3, different parameters on building data set after pre-processing are set forth Corresponding k- prototypes cluster result.It is selected that age, A5 construction areas and this 3 dimensions of A7 building heights are built to show with A1 Cluster result, wherein Fig. 2-a1,2-a2,2-a3,2-a4 is corresponding (τ=0.0009, K=3) cluster result, and Fig. 2-a1 are (A1, A5, A7) dimension cluster result schematic diagram, Fig. 2-a2 be (A1, A5) dimension cluster result schematic diagram, Fig. 2-a3 be (A1, A7) dimension cluster result schematic diagram, Fig. 2-a4 are (A5, A7) dimension cluster result schematic diagram;Fig. 2-b1,2-b2,2-b3,2-b4 For correspondence (τ=0.0009, K=4) cluster result, Fig. 2-b1 are (A1, A5, A7) dimension cluster result schematic diagram, and Fig. 2-b2 are (A1, A5) dimension cluster result schematic diagram, Fig. 2-b3 are (A1, A7) dimension cluster result schematic diagram, and Fig. 2-b4 tie up for (A5, A7) Spend cluster result schematic diagram;
Fig. 3-a1,3-a2,3-a3,3-a4 are corresponding (τ=0.0010, K=3) cluster result, Fig. 3-a1 be (A1, A5, A7) dimension cluster result schematic diagram, Fig. 3-a2 are (A1, A5) dimension cluster result schematic diagram, and Fig. 3-a3 are poly- for (A1, A7) dimension Class result schematic diagram, Fig. 3-a4 are (A5, A7) dimension cluster result schematic diagram;Fig. 3-b1,3-b2,3-b3,3-b4 is corresponding (τ =0.0010, K=4) cluster result, Fig. 3-b1 are (A1, A5, A7) dimension cluster result schematic diagram, and Fig. 3-b2 tie up for (A1, A5) Cluster result schematic diagram is spent, Fig. 3-b3 are (A1, A7) dimension cluster result schematic diagram, and Fig. 3-b4 are (A5, A7) dimension cluster knot Fruit schematic diagram.
By taking (τ=0.0010, K=3) corresponding result of Fig. 3-(a) displays as an example, it is assumed that k- prototype clustering algorithms obtain 3 clusters be respectively C1, C2 and C3, the number containing sample is respectively 10829,3143 and 397 in each cluster, clusters the time About 3.4389 seconds, we can be found that building data are clearly gathered from (A1, A5, A7) dimension picture of Fig. 3-(a) At 3 clusters.By the way that by the comparison of Fig. 3-(a) (τ=0.0009, K=3) cluster results corresponding with Fig. 2-(a), we can be intuitive Ground finds that (τ=0.0010, K=3) corresponding cluster result is better than the cluster result exhibition in τ=0.0009, K=3,2 dimension Show and clearly reflect this point, by taking the comparison in (A1, A5) dimension as an example:Sample weight in (A1, A5) dimension in Fig. 2-(a) It is folded, and sample can clearly divide in (A1, A5) dimension in Fig. 3-(a);Same situation is present in Fig. 2-(a) and Fig. 3-(a) Cluster result in (A1, A7) dimension is shown.
In addition, in correspondence (τ=0.0010, K=4) cluster result that Fig. 3-(b) is shown, it is assumed that k- prototype clustering algorithms 4 obtained clusters are respectively C1, C2, C3 and C4, and the number containing sample is respectively 10522,391,279 and in each cluster 3177, the cluster time is about 9.9067 seconds;
In correspondence (τ=0.0009, K=3) cluster result that Fig. 2-(a) is shown, it is assumed that k- prototype clustering algorithms obtain 3 clusters be respectively C1, C2 and C3, the number containing sample is respectively 10757,3134 and 478 in each cluster, clusters the time About 9.6793 seconds;
In correspondence (τ=0.0009, K=4) cluster result that Fig. 2-(b) is shown, it is assumed that k- prototype clustering algorithms obtain 3 clusters be respectively C1, C2, C3 and C4, the number containing sample is respectively 9316,2160,392 and 2501 in each cluster, is gathered The class time is about 16.7103 seconds
Step S40 carries out classification prediction, really by least one machine learning classification algorithm on the cluster result Whether the classification prediction result that the fixed cluster result carries out above reaches preset accuracy.
Further, it in the step S40, can be tied in the cluster by least one machine learning classification algorithm Classification prediction is carried out above fruit, determines whether the classification prediction result that the cluster result carries out above reaches preset accuracy The step of, including:
The machine learning classification algorithm in 8 kinds of WEKA kits is used on the cluster result to being added to classification The building data of information carry out class test;
Wherein, the machine learning classification algorithm includes:It is Bayesian network, random tree, naive Bayesian, SMO, random gloomy Woods, J48, NBTree and RBF net.
Further, described to reach preset accuracy to reach 90% or more accuracy.
For the cluster result obtained using k- prototype clustering algorithms, need to verify its accuracy and validity.Because according to The cluster result obtained according to different parameters (for example, equilibrating factor etc. in the number of cluster, k- Prototype Algorithms) is to finally building The influence of object risk assessment is very big, and accurately and effectively cluster result can ensure to obtain more credible, reliable evaluation result. This appraisal procedure carries out classification prediction using different machine learning classification algorithms on cluster result, most using nicety of grading High cluster data is as final cluster result.
Specifically, in a specific example:
This step use the Supervised machine learning algorithm in 8 kinds of WEKA kits to be added to classification information (although The semantic information of classification is unknown at this time) building data carry out class test:Bayesian network, random tree, naive Bayesian, SMO, random forest, J48, NBTree and RBF net.
Tables 1 and 2 gives classification accuracy rate (packet of this 8 kinds of sorting algorithms on the corresponding cluster result of different parameters Include the accuracy on each cluster and the accuracy on entire data set), the mode for using 10 10 folding cross validations obtains Experimental result.The result shown in the Tables 1 and 2 can be found that k-prototypes clusters obtain very accurate cluster and tie Fruit, 8 graders of all selections (τ=0.0009, K=3), (τ=0.0009, K=4), (τ=0.0010, K=3), with And (τ=0.0010, K=4) nearly all obtains 90% or more classification accuracy rate, especially random forest and J48 decision trees, it is whole All 99% or more, this shows to cluster to the building number without classification information by k- prototypes nicety of grading on a data set According to mark be effective, the result is that believable.
The outstanding classification performance on building data set in view of J48 decision trees, calculated (τ=0.0009, K=3), The attribute weight of (τ=0.0009, K=4), (τ=0.0010, K=3) and (τ=0.0010, K=4) corresponding 4 data sets It spends, as shown in table 3.
The calculating of Attribute Significance is to use the mode of information gain, can pass through the Attribute in WEKA kits evaluator:Weka.attributeSelection.InfoGainAttributeEval is (using information gain as the list of foundation One attribute evaluation device) function realization.
With data set D={ (xn,yn)|xn=(xn1,xn2... ..., xnM),yn∈ { 1,2 ... ..., C }, n=1,2 ... ..., N } for, using following formula computation attribute AmThe information gain of (m ∈ { 1,2 ... ..., m }):
Gain (D, Am)=Before_Ent (D)-After_Ent (D, Am),
The comentropy of data set D is before wherein attribute Am being used to divide:
Nc indicates the number of C class samples in data set D;
Assuming that attribute AmValue beSo use AmData set D after division Comentropy is:
| D | indicate the mould of data set D, i.e. the number containing sample in data set D,Indicate data setMould,Indicate data setIn c class samples number.
Table 1:The classification accuracy rate of different classifications device on the corresponding k-prototypes cluster results in τ=0.0009
Table 2:The classification accuracy rate of different classifications device on the corresponding k-prototypes cluster results in τ=0.0010
Table 3:The corresponding Attribute Significance of different cluster results
Step S50, when the classification prediction result carried out on the cluster result reaches preset accuracy, according to band There are the building data of cluster result classification and the preset design fire risk class, using J48 decision trees to described The fire risk of target construction is graded.
Further, for having gathered class and having verified the building data of cluster result accuracy, its fire how is determined Risk class is a critical issue.This appraisal procedure extracts knowledge rule, root using J48 decision tree techniques from cluster data It further grades to the fire risk of building according to these knowledge rules.
Specifically, please also refer to Fig. 4-7, include with the default risk assessment index of the corresponding data dimension:5 Continuous valued attributes:A1 building the age, A2 index beds area, A5 construction areas, A6 building in the same time can accommodate maximum number, A7 building heights;And 1 discrete type attribute:B3 Fire lift numbers;For illustrate.
Fig. 4:Decision tree that J48 algorithms generate on the cluster result corresponding with K=3 of τ=0.0009 (32 nodes, In 19 leaf nodes, contribute 0.70 second);
Fig. 5:Decision tree that J48 algorithms generate on the cluster result corresponding with K=4 of τ=0.0009 (36 nodes, In 21 leaf nodes, contribute 0.80 second);
Fig. 6:Decision tree that J48 algorithms generate on the cluster result corresponding with K=3 of τ=0.0010 (22 nodes, In 12 leaf nodes, contribute 0.79 second);
Fig. 7:Decision tree that J48 algorithms generate on the cluster result corresponding with K=4 of τ=0.0010 (totally 23 nodes, Wherein 12 leaf nodes are contribute 0.84 second).
After obtaining the building data with classification, the mark of class is Cluster-1, Cluster-2, Cluster- 3 or Cluster-1, Cluster-2, Cluster-3, Cluster-4, for differentiate Cluster-1, Cluster-2, Concrete meaning representated by Cluster-3 or Cluster-4, representative level of building fire risk.This step is generated in (τ =0.0009, K=3), (τ=0.0009, K=4), (τ=0.0010, K=3) and (τ=0.0010, K=4) corresponding 4 J48 decision trees on a data set, as shown in Figure 4-Figure 7.Using these decision trees come it is final determine Cluster-1, Level of building fire risk representated by Cluster-2, Cluster-3 or Cluster-4.Intuitively comparison it can be found that τ= Corresponding two decision trees are simple for 0.0010 corresponding two decision tree ratios τ=0.0009.Therefore, by taking Fig. 6 and Fig. 7 as an example in detail Carefully illustrate the specifying information for including in these decision trees:The interior nodes wherein set indicate the conditional attribute of data set;Leaf node Classification is represented, the triple [a, b, c] or four-tuple [a, b, c, d] on leaf node represent of different cluster samples in the node Number;Path of each from root node to leaf node represents a classifying rules.
Decision tree shown in fig. 6 contains 22 nodes altogether, wherein 12 leaf nodes, the time of contributing is about 0.79 second, per cluster The number of sample is respectively | C1 |=10829, | C2 |=3143 and | C3 |=397.Three are chosen from root node to representing difference The path of the leaf node of cluster, as follows:
R1:If [building age≤15.5 year] and [building height≤64.5 meter] and [the same time can hold in building Receive the people of maximum number≤5900] and [index bed area≤60519 square metre] and [construction area≤189848.5 square metre], that [cluster classification=Cluster-1] (leaf node sample distribution is [10808,0,56]);
R2:If [the building age>15.5] and [building height≤72.45 meter] and [the same time can hold in building Receive the people of maximum number≤7600], then [cluster classification=Cluster-2] (leaf node sample distribution is [0,3139,7]);
R3:If [the building age>15.5] and [building height≤72.45 meter] and [the same time can hold in building Receive maximum number>7600 people], then [cluster classification=Cluster-3] (leaf node sample distribution is [0,1,6]).
In conjunction with fire risk common sense, may determine that according to this three rule:The light grade fire risks of Cluster-1=, Cluster-2=middle ranks fire risk and the serious grade fire risks of Cluster-3=.The reason is as follows that:
[1], for regular R1, when again building is relatively new, height is very low, galleryful considerably less, index bed area and is built Build area all very little when, can directly infer such building occur fire risk it is smaller, be light grade risk;
[2], regular R3 can be pushed away when building is older, the slightly lower while galleryful of height is again very much The very risky of fire occurs for disconnected such building, is serious grade risk;
[3], after being inferred to the fire risk of light grade and serious grade, remaining sample is then only intermediate fire wind Danger.In fact, for regular R2, when building is older, highly slightly lower while galleryful passes through again not counting when too many With the comparison of regular R1, it is believed that the risk that fire occurs for such building is higher than light grade, for middle rank.
Decision tree shown in Fig. 7 contains 23 nodes altogether, wherein 12 leaf nodes, the time of contributing is about 0.84 second, per cluster The number of sample is respectively | C1 |=10522, | C2 |=391, | C3 |=279 and | C4 |=3177.Four are chosen from root node To the path for the leaf node for representing different clusters, as follows:
T1:If [building age≤14.5 year] and [building height≤64.5 meter] and [the same time can hold in building Receive the people of maximum number≤5900] and [index bed area≤60519 square metre] and [construction area≤189848.5 square metre], that [cluster classification=Cluster-1] (leaf node sample distribution is [10501,52,0,0]);
T2:If [14.5<Build age≤27.5 year] and [building height>70 meters] and [same time in building Maximum number can be accommodated>550 people], then [cluster classification=Cluster-2] (leaf node sample distribution is [0,21,0,1]);
T3:If [the building age>27.5], then [cluster classification=Cluster-3] (leaf node sample distribution be [0, 0,279,0]);
T4:If [14.5<Build age≤27.5 year] and [building height≤70 meter] and [same time in building The people of maximum number≤5500 can be accommodated], then [cluster classification=Cluster-4] (leaf node sample distribution be [0,5,0, 3168])。
In conjunction with fire risk common sense, may determine that according to this four rule:Cluster-1=I grades of fire risks, Cluster-4=II grades of fire risks, Cluster-2=III grades of fire risks and Cluster-3=IV grades of fire risks.It is former Because as follows:
[1], for rule T 1, when again building is relatively new, height is very low, galleryful considerably less, index bed area and is built Build area all very little when, can directly infer such building occur fire risk it is smaller, be I grades of risks;
[2], it for rule T 4, by [building age≤14.5 year] and [building height≤64.5 meter] with T1 and [builds The people of maximum number≤5900 can be accommodated by building the same time in object] comparison, [14.5<Build age≤27.5 year] and [building is high ≤ 70 meters of degree] and the fire risk of [the same time can accommodate the people of maximum number≤5500 in building] corresponding building want high Some because the age of building be slightly above rule T 1, it is inferred that such building be II grades of risks;
[3], for rule T 2, pass through [14.5 years with T4<Build age≤27.5 year] and [building height≤70 meter] And [the same time can accommodate the people of maximum number≤5500 in building] comparison, [14.5<Building age≤27.5 year] and [build Build height>70 meters] and [the same time can accommodate maximum number in building>550 people] height of corresponding building is higher than T4 influences a key factor of fire risk assessment, it can be considered that the corresponding buildings of T2 since " building height " is Fire risk is higher than T4, is III level risk;
[4], after being inferred to the fire risk of I grades, II grades and III level, remaining sample is then only IV grades of fire Risk.In fact, for rule T 3, influence fire risk to evaluate mostly important factor since " building age " is, when [the building age>27.5] when, it is believed that the fire risk of building is IV grades.
In the present embodiment, by building fire risk class appraisal procedure, level of building fire risk judgement rule are outputed Then.When there is new building to build up, the level of building fire risk of building can be assessed by decision rule, to help fire-fighting Supervision department realizes Precision management, emphasis prevention and control.
In one embodiment, the default risk assessment index of the corresponding data dimension includes:
5 Continuous valued attributes:A1 building ages, A2 index beds area, A5 construction areas, A6 buildings interior same time can hold Receive maximum number, A7 building heights;And
1 discrete type attribute:B3 Fire lift numbers;
The building fire risk class appraisal procedure specific rules include:
In [A1 builds age≤15.5 year] and [building height≤64.5 meter A7] and [the same time can accommodate in A6 buildings The people of maximum number≤5900] and [A2 index beds area≤60519 square metre] and [construction area≤189848.5 square metre A5], Then determine [fire risk=light grade];
At [the A1 building ages>15.5] and [building height≤72.45 meter A7] and [A6 building in the same time can accommodate The people of maximum number≤7600], it is determined that [fire risk=middle rank];
At [the A1 building ages>15.5] and [building height≤72.45 meter A7] and [A6 building in the same time can accommodate Maximum number>7600 people], it is determined that [fire risk=serious grade];
In [A1 builds age≤15.5 year] and [building height≤64.5 meter A7] and [the same time can accommodate in A6 buildings Maximum number>5900 people], it is determined that [fire risk=serious grade];
At [the A1 building ages>15.5] and [A7 building heights>72.45 meters] and [Fire lift number=1 or 2], Then determine [fire risk=serious grade].
It is understood that in the description of this specification, reference term " embodiment ", " another embodiment ", " other The description of embodiment " or " first embodiment~N embodiments " etc. means specific spy described in conjunction with this embodiment or example Sign, structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned The schematic representation of term may not refer to the same embodiment or example.Moreover, the specific features of description, structure, material Or feature can be combined in any suitable manner in any one or more of the embodiments or examples.
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row His property includes, so that process, method, article or system including a series of elements include not only those elements, and And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including this There is also other identical elements in the process of element, method, article or system.
The preferred embodiment of the present invention is not intended to limit the scope of the invention, every under the design of the present invention, Using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/it is used in other relevant technologies indirectly Field is included in the scope of patent protection of the present invention.

Claims (10)

1. a kind of building fire risk class appraisal procedure, which is characterized in that including step:
According to the data of target construction, the corresponding default risk assessment index of the target construction is obtained;
Default value pretreatment is carried out to the default risk assessment index of acquisition, obtains pretreated building data;
Be cluster number of clusters according to preset design fire risk class, by k- prototypes clustering algorithm to carrying out the pretreatment after Building data carry out clustering processing obtain cluster result;
Classification prediction is carried out on the cluster result by least one machine learning classification algorithm, determines the cluster knot Whether the classification prediction result that fruit carries out above reaches preset accuracy;
When the classification prediction result carried out on the cluster result reaches preset accuracy, according to cluster result class Other building data and the preset design fire risk class, using J48 decision trees to the target construction Fire risk is graded.
2. building fire risk class appraisal procedure according to claim 1, which is characterized in that described to be built according to target The data for building object, the step of obtaining the target construction corresponding default risk assessment index, including:
According to the data dimension of the data of target construction, the default risk of the corresponding data dimension of the target construction is obtained Evaluation index.
3. building fire risk class appraisal procedure according to claim 2, which is characterized in that the corresponding data The default risk assessment index of dimension includes at least one of following attribute value:
8 numerical attributes or Continuous valued attributes, including:A1 builds age, A2 index beds area, the A3 refuge stories gross area, A4 Aerial layer area, A5 construction areas, A6 buildings interior same time can accommodate maximum number, A7 building heights and the undergrounds A8 level Product;And
10 symbol attributes or discrete value attribute, including:The grounds the B1 number of plies, the undergrounds the B2 number of plies, B3 Fire lifts number, B4 take refuge Layer number, B5 buildings classification, B6 building structure, the whether voluminous power of B7, B8 fire resistance ratings, B9 construction status value and the administrative areas B10 Domain.
4. building fire risk class appraisal procedure according to claim 1, which is characterized in that the institute of described pair of acquisition The step of default risk assessment index carries out default value pretreatment, obtains pretreated building data is stated, including:
When the attribute value of the default risk assessment index is discrete type, default value is positioned as the default risk assessment and is referred to The highest attribute value of frequency of occurrence in mark;And/or
When the attribute value of the default risk assessment index is continuous type, default value is positioned as the default risk assessment and is referred to The mean value of attribute value in mark.
5. building fire risk class appraisal procedure according to claim 1, which is characterized in that the preset setting Level of building fire risk is 3 grades or 4 grades.
6. building fire risk class appraisal procedure according to claim 1, which is characterized in that described according to preset Design fire risk class is cluster number of clusters, by k- prototypes clustering algorithm to carry out the pretreated building data into Row clustering processing obtains the step of cluster result, including:
It is cluster number of clusters according to preset design fire risk class, contains in adjustment k- prototypes cluster sample similarity measure formulas The numerical value of some undetermined parameter τ is clustered by k- prototypes clustering algorithm to carrying out the pretreated building data Processing.
7. building fire risk class appraisal procedure according to claim 1, which is characterized in that described to pass through at least one Kind machine learning classification algorithm carries out classification prediction on the cluster result, determines point that the cluster result carries out above The step of whether class prediction result reaches preset accuracy, including:
The machine learning classification algorithm in 8 kinds of WEKA kits is used on the cluster result to being added to classification information The building data carry out class test;
Wherein, the machine learning classification algorithm includes:Bayesian network, random tree, naive Bayesian, SMO, random forest, J48, NBTree and RBF net.
8. building fire risk class appraisal procedure according to claim 7, which is characterized in that described to reach preset Accuracy is to reach 90% or more accuracy.
9. the building fire risk class appraisal procedure according to any one of claim 1-8, which is characterized in that described The default risk assessment index of corresponding data dimension includes:
5 Continuous valued attributes:A1 building ages, A2 index beds area, A5 construction areas, A6 buildings interior same time can accommodate most Big number, A7 building heights;And
1 discrete type attribute:B3 Fire lift numbers.
10. building fire risk class appraisal procedure according to claim 9, which is characterized in that
In [A1 builds age≤15.5 year] and [building height≤64.5 meter A7] and [the same time can accommodate maximum in A6 buildings The people of number≤5900] and [A2 index beds area≤60519 square metre] and [construction area≤189848.5 square metre A5], then really Fixed [fire risk=light grade];
At [the A1 building ages>15.5] and [building height≤72.45 meter A7] and [A6 building in the same time can accommodate maximum The people of number≤7600], it is determined that [fire risk=middle rank];
At [the A1 building ages>15.5] and [building height≤72.45 meter A7] and [A6 building in the same time can accommodate maximum Number>7600 people], it is determined that [fire risk=serious grade]
In [A1 builds age≤15.5 year] and [building height≤64.5 meter A7] and [the same time can accommodate maximum in A6 buildings Number>5900 people], it is determined that [fire risk=serious grade];
At [the A1 building ages>15.5] and [A7 building heights>72.45 meters] and [Fire lift number=1 or 2], then really Fixed [fire risk=serious grade].
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