CN101694629B - Context sensing application platform based on main body and work method thereof - Google Patents

Context sensing application platform based on main body and work method thereof Download PDF

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CN101694629B
CN101694629B CN200910236492.3A CN200910236492A CN101694629B CN 101694629 B CN101694629 B CN 101694629B CN 200910236492 A CN200910236492 A CN 200910236492A CN 101694629 B CN101694629 B CN 101694629B
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information
context
contextual information
application
ontology
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CN101694629A (en
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乔秀全
李晓峰
李艳娜
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Abstract

Disclosed is a context sensing application platform based on main body and a work method thereof, wherein the creation core of the invention is to supply a general-purpose processing model for obtaining context information, wherein the processing model comprises a gatherer communication module, a context information processing module, a management module, a knowledge information base, a context application processing module and a context sensing application platform of the context application processing module, when the application platform is supplied for sensing the context application, two mutually-independent and mutually-coordinated context information processing flows are proposed on how to use the context information processing steps, are mutually transparent, and share knowledge information through a synchronous control mechanism. The two processing flows are both on the basis of the context sensing and application platform of the invention, cover each flow of the context information processing, and reach knowledge sharing. The invention uses a main body to describe the context information, and reaches the universal share of knowledge information in the calculating field.

Description

A kind of context perception application platform and method of work thereof based on body
Technical field
The present invention relates to a kind of context perception application platform and the contextual information disposal route based on this perception application platform, belong to the technical field of computer utility.
Background technology
Along with the continuous of computing machine popularized and develop rapidly, and the extraordinary development of mobile computing and sensor network, various mobile devices enter people's life more and more, calculate and have also been dissolved in people's life.General fit calculation (Ubiquitous or Pervasive Computing) is the once newly change of the computation schema after Framework computing and Desktop Computing, its proposition has changed the mode that people use computational resource, and the calculating centered by computing machine is converted into calculating focusing on people.Common calculating model requires the computing equipment can the residing context of perception user and variation thereof, and makes corresponding action.Its theory is to create a new environment of the information service that people-oriented, and one of its key theory is exactly context-aware, by context-aware, various computational resources, information service and people is organically combined, and farthest automatically performs user task.
At present, the research to context perception application platform frame models, the most representative is location context model, as seven layers of position model, but it is to the context research of higher level seldom; Other supports the platform framework model of context-aware applications to also have Stick-enotes, CoolTown, Cyberdesk, Context Toolkit etc.
Stick-enotes platform is supported particular type context-aware applications, how its concern supports application developer to carry out relevant context-aware behavior with contextual information, and the target of its research is to allow non-programming personnel can easily write context-aware service; It provides a kind of general mechanism to be used to indicate application designer and has used which type of context, and provide the simple semantic description of relevant rule, but how Stick-enotes platform not research obtains context, does not also support Context query, storage or explanation.
CoolTown platform is also a framework of supporting context-aware applications, and it when its Web page is collected after the fresh information of relevant entity, dynamically upgrades oneself with the object in Web page representation real world (comprising people, place and equipment); CoolTown platform architecture provides abstract component (the Web page of the URLs of perception information and description entity) and discovery mechanism, and it is easier that this makes to develop aware application; But it does not support explanation and the context data storage of bottom perception information, does not support Dynamic Execution service yet.
Cyberdesk platform can according to virtual context, (so-called virtual context be user's personal information, comprise email address, address, date, name and URLs etc.) or from the context of sensor, automatically the integrated service based on Web, completes corresponding context-aware applications.Although its manageable context type is limited,, it has many mechanism of general context aware platform framework; This Cyberdesk platform architecture is supported the integrated of contextual information, still, does not support a plurality of aware application; It uses centralized mechanism managing context information, still, does not also support contextual inquiry or storage.
Context Toolkit platform framework is mainly paid close attention to context programming rather than context represents, Context Toolkit platform framework is set up and formed by gadget, interpreter, polymerizer, service, discovery device etc.Gadget has shielded the complicacy that application program is directly used sensor, and contextual information abstract be the required form of application program.Interpreter is used for promoting contextual level of abstraction, also can be used to a plurality of context source information of reasoning and obtains new contextual information.Polymerizer is used for a plurality of relevant contextual informations in logic to collect in a storehouse, with the use that facilitates application program to set up.Find that device is used for safeguarding the function of component register in framework.From the above, Context Toolkit supports contextually to obtain, explanation and integrated, and provide the Persistent Management of contextual information, communication and the contextual information that support distributes to obtain, the application of contextual history is had to certain support, but it is indefinite to sharing contextual support scheme and model.
Chinese patent application (application number 200810236556.5) has proposed a kind of context perception application platform model based on body.Contextual information securing layer wherein completes from sensor device collection signal, obtains original contextual information.Contextual information fused layer obtains original contextual information from context securing layer, and after preliminary abstract and processing, obtains rudimentary contextual information.Context information management layer is from contextual information fused layer obtains rudimentary contextual information, by using Ontology and inference mechanism to obtain senior contextual information.Context application layer is that each context item, abstract situation are become to modeling context object in application unification, attribute and associative operation that its view of presenting to application is one group of service layer.This patent application by one group to all context/situation information all applicable general service operate, shield concrete context isomerism, context-aware applications developer is embedded into these business operations in its application, realizes obtaining with logic of context/situation and judge.But in this patented claim, just discussed 4 layer models of the context-aware framework based on body, not relating to platform framework while collecting bottom contextual information is the flow process how to process; When not relating to platform yet and providing service support for context application, the concrete treatment scheme of contextual information.
In a word, the processing platform of existing domestic and international various context-aware applications all exists panoramic different defect to some extent, how to succeed in developing as early as possible there is higher level, context perception application platform with better function, just become the new focus that scientific and technical personnel pay close attention in the industry.
Summary of the invention
In view of this, the object of this invention is to provide a kind of deficiency, the context perception application platform based on body and contextual information disposal route based on this perception application platform that can overcome above-mentioned existing various context-aware applications; The present invention not only comprises the context perception application platform that obtains the transaction module of contextual information-based on body, and comprise that this context perception application platform based on body is when context-aware is applied, how to use the treatment step of contextual information, by synchronous and managing context information bank, wherein two class disposal routes are completely independent, can reach transparent effect mutually.
In order to achieve the above object, the invention provides a kind of context perception application platform based on body, it is characterized in that: this platform is provided with following function module:
Collector communication module, be responsible for communicating by letter between this context perception application platform and bottom sensor, this collector communication module is to use a kind of open standard FIPA(Foundation for Intelligent Physical Agents that follows agency plant) relevant regulations, realize the JADE software architecture of agency plant, each in this collector communication module acted on behalf of between agent and used Agent communication language ACL to communicate;
Contextual information processing module, is responsible for the contextual information receiving from collector communication module to process, and is provided with collision detection, contextual information instances of ontology and three unit of contextual information reasoning; The function of three unit in this contextual information processing module is respectively:
Contextual information instances of ontology unit, be responsible for creating the function of instances of ontology, for accepting calling of contextual information processing module, after the various information that comprise location context, terminal context, network context, environmental context that parsing receives, according to the corresponding ontology model in Knowledge information library, create instances of ontology model;
Collision detection unit, is responsible for contextual information to carry out the detection of various data collisions, and according to different application scenarioss, colliding data is processed, or directly abandon the colliding data of this time, or obtain conforming data according to user's historical information;
Contextual information reasoning element, be responsible for utilizing the content of storing in Knowledge information library in platform to carry out interactivity reasoning, and use respectively the built-in inference rule of Jena rule-based reasoning system loads and self-defining inference rule to carry out reasoning, the former is for solving the inconsistency of contextual information and implicit contextual information, the latter is according to a plurality of contextual informations, derivation or more abstract, the high-rise contextual information of deducing, to provide the more useful contextual information of context application;
Administration module, is in charge of Knowledge information library, accepts calling of contextual information processing module and context application processing module, and Knowledge information library is carried out to synchro control, reaches the object of sharing knowledge base; Be provided with knowledge information updating block, knowledge information access unit and file access lock unit; The bookkeeping function that three unit in this administration module are carried out is respectively:
Knowledge information updating block, is responsible for upgrading instances of ontology database data: the solicited message of upgrading custom rule according to context application is added new regulation to rule base, or the rule in deletion rule storehouse; According to context application, upgrade the solicited message of subscribing to, in subscription information storehouse, add subscription information or delete subscription information;
Knowledge information access unit, is responsible for storage general field ontology library, creates the ontology model in specific area; Inquiry and storage instances of ontology data are to instances of ontology storehouse; Rule Information in inquiry and storage rule storehouse; Upper layer application subscription information in inquiry and storage subscription information storehouse;
File access lock unit, is responsible in this application platform from top to bottom and from bottom to top during disposal route, information in synchro control Knowledge information library;
Knowledge information library, all knowledge informations of responsible this platform of storage and maintenance, are provided with ontology library, instances of ontology storehouse, rule base and subscription information storehouse, use Jena language manipulation Knowledge information library, usage data storehouse Mysql or file stored knowledge information bank; Ontology library wherein stores the description to various contextual information models, instances of ontology stock contains the contextual information obtaining through the contextual information of collision detection and reasoning, rule base stores the self-defining specific inference rule of upper layer application, and subscription information stock contains upper layer application and uses this platform that the information of service is provided; And the storage information of classifying in two ways: a kind of is permanent database storage mode, for storing the little or substantially constant information of change frequency of the historical example of ontology library and body; Another kind is at local internal memory, to create ontology file to store, for storing knowledge information frequent use, that comprise subscription information storehouse, rule base, body latest instance data; Adopt above-mentioned storage mode obviously to provide running efficiency of system, meet knowledge information of a great variety, store complicated feature;
Context application processing module, is responsible for the request of response context application, is provided with four unit that contextual information inquiry, contextual information subscription, contextual information notice and contextual information inference rule are formulated; Four Elementary Functions in this context application processing module are respectively:
Contextual information query unit, be responsible for processing context application query context information request, query statement is used SPARQL language to be described, this SPARQL language is for a kind of defined query language of RDF data model and data acquisition protocols of developing for W3C of unified resource describing framework RDF exploitation, also can be used in the information resources that any employing RDF represents;
Contextual information subscriber units, be responsible for the request of the subscription context information of context application to process, call knowledge information access unit and knowledge information updating block in administration module, storage, renewal subscription information, the below up-to-date contextual information of applicative notifications so that platform makes progress in time; By this unit, the inquiry to subscription information, the retouching operation of additions and deletions applied in context;
Contextual information notification unit, is responsible for the based on context subscription information of application, in time to the ordered contextual information of applicative notifications;
Contextual information inference rule is formulated unit, is responsible for processing the inference rule that context application is formulated, and comprises the inquiry to inference rule, the retouching operation of additions and deletions, for the reasoning element in contextual information processing module, according to these inference rules, carries out reasoning;
Context application communication module, applies the entrance that service is provided to context as this platform, this module is equivalent to a message distributor, is responsible for accepting the request of context application, and different application messages is transmitted to different context application.
In order to achieve the above object, the present invention also provides the contextual information disposal route of the context perception application platform that a kind of employing the present invention is based on body, it is characterized in that: should adopt the method that comprises inquiry, subscribes to, lays down a regulation by the context perception application platform based on body, for the application of exploitation context provides service support; For the various physics of bottom, logical sensor, software sensors, context perception application platform based on body is by Java intelligent body development platform JADE(Java Agent Development Framework), after the contextual information that collection distributed sensor gathers, these contextual informations are focused on; The flat application station of this context-aware is divided into two separate processing procedures from top to bottom following and from bottom to top to the processing of contextual information, and by synchro control make two kinds for the treatment of schemees from top to bottom and from bottom to top mutually transparent, be independent of each other;
Described contextual information treatment scheme is from bottom to top: by physical sensors, software sensors, logical sensor and user profile, act on behalf of to obtain primal environment, equipment and user's context, and obtain rudimentary contextual information through preliminary abstract and processing; By contextual information instances of ontology unit, contextual information is illustrated as having to semantic instances of ontology model again; Then by collision detection unit, eliminate noisy contextual information; Utilization comprises uses the ontology inference of description logic and the inference mechanism of the Ontology based on User Defined rule-based reasoning to obtain senior contextual information, by the renewal of Context Knowledge information bank, store and management context; This contextual information treatment scheme from bottom to top comprises following operation steps:
(1) collector communication module by the various sensor collections of physics, logic, software comprise customer position information, environmental information, user terminal information, the network information, and user agent's information all reports the contextual information processing module of this application platform;
(2) contextual information processing module is accepted the contextual information from collector communication module, calls context ontology instantiation unit, according to corresponding ontology model, creates instances of ontology model;
(3) contextual information processing module is called collision detection unit, and instances of ontology data are carried out to collision detection; The semantic information of recycling context ontology, carries out data consistent check; According to historical data, eliminate the data with noise;
(4) contextual information processing module is called contextual information reasoning element, loads inference machine, the reasoning of Execution context information;
(5) if contextual information reasoning element is not released new high-rise contextual information, this contextual information treatment scheme finishes; If contextual information reasoning element has obtained new high-rise contextual information, call the knowledge information access unit of administration module, upgrade instances of ontology data; Call knowledge information updating block, querying information of subscription storehouse, judges whether this storehouse operation of refreshing one's knowledge is associated with the subscription information of some context application simultaneously; If there is no corresponding subscription information, this processing contextual information flow process finishes; If had, call contextual information notification unit, to the up-to-date contextual information of context applicative notifications of subscribing to this instances of ontology partial information;
The top-down treatment scheme of described contextual information is: for the exploitation of context-aware applications provides service, support inquiry, subscription, notification context information and the self-defined inference rule of context application, this application platform provides application interface for context-aware applications developer, application developer by this interface inquiry, subscribe to and comprise rudimentary context and senior contextual contextual information; Developer can also pass through the self-defined inference rule of this interface, meets and provides personalized service for different application; Context perception application platform based on body returns to upper layer application by interface by announcement information; The top-down treatment scheme of this contextual information comprises following operation steps:
(1) context application, by context application communication module, sends application request to the context perception application platform based on body;
(2) contextual information processing module receives this application request and judges the type of this application request, calls corresponding unit and carries out following processing:
If user's inquiry request is given contextual information query unit; Contextual information query unit is called the knowledge information access unit in administration module, carries out query engine, inquiry instances of ontology information, and return to context application;
If user's subscribe request is given contextual information subscriber units; Contextual information subscriber units, according to different action types, is called the corresponding units of administration module: if upgrade operation, call knowledge information updating block, upgrade subscription information storehouse; If accessing operation, calls knowledge information access unit, storage subscription information;
If user formulates the request of inference rule, give contextual information inference rule unit; Contextual information inference rule unit, according to different action types, calls the corresponding units of administration module: if upgrade operation, call knowledge information updating block, update rule storehouse; If accessing operation, calls knowledge information access unit, store this rule.
The core of the invention is to provide a kind of general context perception application platform, and on this application platform basis, by coordination, controls two kinds of different contextual information treatment schemees and from bottom to top from top to bottom, reaches sharing of knowledge; And use ontology describing contextual information, reached sharing of knowledge information in general fit calculation field.
The perception application platform that the present invention proposes is based on middleware thought.For context-aware applications, shielded concrete context isomerism; For the sensor of all kinds of Information Monitorings, shielded concrete context application and development, thereby simplified the processing procedure of contextual information.In addition, another innovation of the present invention is the contextual information treatment scheme that has proposed two kinds of separate and mutual coordinations, and they are transparent each other, by synchro control mechanism, share knowledge information.And these two kinds for the treatment of schemees are all based on the context perception application platform based on body of the present invention, contained each flow process that contextual information is processed.
Accompanying drawing explanation
Fig. 1 is that the structure that the present invention is based on the context perception application platform of body forms schematic diagram.
Fig. 2 the present invention is based on the process flow diagram of processing for contextual information from bottom to top in the contextual information disposal route of context perception application platform of body.
Fig. 3 is the contextual information notice process flow diagram in the present invention.
Fig. 4 the present invention is based on the process flow diagram of processing for top-down contextual information in the contextual information disposal route of context perception application platform of body.
Fig. 5 is the contextual information reasoning process flow diagram in the present invention.
Fig. 6 is the process flow diagram that the synchronous documents in the present invention is controlled.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
Referring to Fig. 1, introduce the composition structure of the context perception application platform that the present invention is based on body, this platform is provided with following software function module:
Collector communication module, be responsible for communicating by letter between this context perception application platform and bottom sensor, this collector communication module is to use a kind of open standard FIPA(Foundation for Intelligent Physical Agents that follows agency plant) relevant regulations, the JADE Software for Design of realizing agency plant realize, each in this collector communication module acted on behalf of and between agent, used Agent communication language ACL(Agent Communication Language) communicate;
Contextual information processing module, is responsible for the contextual information receiving from collector communication module 101 to process, and is provided with collision detection, contextual information instances of ontology and three unit of contextual information reasoning; The function of these three unit is respectively:
Contextual information instances of ontology unit, be responsible for creating the function of instances of ontology, for accepting calling of contextual information processing module, after the various information that comprise location context, terminal context, network context, environmental context that parsing receives, according to the corresponding ontology model in Knowledge information library, create instances of ontology model;
Collision detection unit, the detection of being responsible for contextual information to carry out various data collisions is (as customer location conflict, same time of people can not be in two different places etc.), and according to different application scenarioss, colliding data is processed, or directly abandon the colliding data of this time, or obtain conforming data according to user's historical information;
Contextual information reasoning element, be responsible for utilizing the Context Knowledge information of storing in Knowledge information library in platform to carry out interactivity reasoning, and use respectively the built-in inference rule of Jena rule-based reasoning system loads and self-defining inference rule to carry out reasoning, the former is for solving the inconsistency of contextual information and implicit contextual information, the latter is according to a plurality of contextual informations, derivation or more abstract, the high-rise contextual information of deducing, to provide the more useful contextual information of context application; For example, utilize the Context Knowledge information of storage to carry out interactivity reasoning.Use Jena rule-based reasoning system to carry out the reasoning of the built-in rule of body, for domain-planning, use some general rule-based reasoning systems to carry out reasoning.
Administration module, is in charge of Knowledge information library, accepts calling of contextual information processing module and context application processing module, and Knowledge information library is carried out to synchro control, realizes the object of sharing knowledge base; It mainly operates and comprises the storage of instances of ontology model, knowledge information, custom rule and upper layer application subscription information, renewal, inquiry, interpolation, deletion etc.; Be provided with knowledge information renewal, knowledge information access and synchronous three unit of file access; The bookkeeping function that these three unit are carried out is respectively:
Knowledge information updating block, is responsible for upgrading instances of ontology database data: the solicited message of upgrading custom rule according to context application is added new regulation to rule base, or the rule in deletion rule storehouse; According to context application, upgrade the solicited message of subscribing to, in subscription information storehouse, add subscription information or delete subscription information;
Knowledge information access unit, is responsible for storage general field ontology library, creates the ontology model in specific area; Inquiry and storage instances of ontology data are to instances of ontology storehouse; Rule Information in inquiry and storage rule storehouse; Upper layer application subscription information in inquiry and storage subscription information storehouse;
File access lock unit, is responsible in this application platform from top to bottom and from bottom to top during disposal route, information in synchro control Knowledge information library.
Knowledge information library, all knowledge informations of responsible this application platform of storage and maintenance, are provided with ontology library, instances of ontology storehouse, rule base and subscription information storehouse, use Jena language manipulation Knowledge information library, usage data storehouse Mysql or file stored knowledge information bank; Ontology library wherein stores the description to various contextual information models, instances of ontology stock contains the contextual information obtaining through the contextual information of collision detection and reasoning, rule base stores the self-defining specific inference rule of upper layer application, and subscription information stock contains upper layer application and uses this platform that the information of service is provided; And the storage information of classifying in two ways: a kind of is permanent database storage mode, the little or substantially constant information of change frequency that is mainly used in storing ontology library and the historical example of body; Another kind is at local internal memory, to create ontology file to store, for storing the knowledge information of frequent use, and such as subscription information, rule base, up-to-date instances of ontology data etc.; Adopt above-mentioned classification storage mode obviously to provide running efficiency of system, meet knowledge information of a great variety, store complicated feature;
Context application processing mould, the responsible request that responds context application, is provided with four unit that contextual information inquiry, contextual information subscription, the formulation of contextual information inference rule and contextual information are notified; The function of these four unit is respectively:
Contextual information query unit, be responsible for processing context application query context information request, query statement use SPARQL(Simple Protocol and RDF Query Language) language is described, this SPARQL language is to be unified resource describing framework RDF(Resource Description Framework) exploitation a kind of defined query language of RDF data model and data acquisition protocols of developing for W3C, also can be used in the information resources that any employing RDF represents.
Contextual information subscriber units, be responsible for the request of the subscription context information of context application to process, call subscription information access unit and updating block in administration module, storage, renewal subscription information, the below up-to-date contextual information of applicative notifications so that platform makes progress in time; By this unit, the inquiry to subscription information, the retouching operation of additions and deletions applied in context.
Contextual information inference rule is formulated unit, is responsible for processing the inference rule that context application is formulated, and comprises the inquiry to inference rule, the retouching operation of additions and deletions, for the reasoning element in contextual information processing module, according to these inference rules, carries out reasoning.
Contextual information notification unit, is responsible for the based on context subscription information of application, in time to the ordered contextual information of applicative notifications.
Context application communication module, is that this platform is applied the entrance that service is provided to context, and this module is equivalent to a message distributor, is responsible for accepting the request of context application, and different application messages is transmitted to different context application.
The present invention also provides a kind of contextual information disposal route of the context perception application platform based on body: the processing of contextual information is divided into two separate processing procedures and from bottom to top from top to bottom, developer for context-aware applications, context perception application platform by this based on body adopts the method that comprises inquiry, subscribes to, lays down a regulation etc., applies service support is provided for exploitation context; For the various physics of bottom, logical sensor, software sensors, context perception application platform based on body is by Java intelligent body development platform JADE(Java Agent Development Framework), after the contextual information that collection distributed sensor gathers, these contextual informations are focused on; The flat application platform of this context-aware by synchro control make two kinds for the treatment of schemees from top to bottom and from bottom to top mutually transparent, be independent of each other.
The treatment scheme that the present invention carries out from bottom to top contextual information is: by physical sensors, software sensors, logical sensor and user profile, act on behalf of to obtain primal environment, equipment and user's context, and obtain rudimentary contextual information through preliminary abstract and processing; By instances of ontology unit, contextual information is illustrated as having to semantic instances of ontology model; Then by collision detection unit, eliminate noisy contextual information; Utilization comprises uses the ontology inference of description logic and the inference mechanism of the Ontology based on User Defined rule-based reasoning to obtain senior contextual information, by the renewal of Context Knowledge information bank, store and management context.
The present invention carries out top-down treatment scheme to contextual information: for the exploitation of context-aware applications provides service, support inquiry, subscription, notification context information and the self-defined inference rule of context application, this application platform provides application interface for context-aware applications developer, application developer by this interface inquiry, subscribe to and comprise rudimentary context and senior contextual contextual information; Developer can also pass through the self-defined inference rule of this interface, meets and provides personalized service for different application; Context perception application platform based on body returns to upper layer application by interface by announcement information.
Referring to Fig. 2, introduce each operation steps of top-down contextual information treatment scheme:
Step 1, context application, by context application communication module, send application request to the context processing platform based on body.Context application communication module is responsible for receiving different application request message as the message distributor of this application platform, is forwarded to application platform and processes; And in this application platform, handle after request, by this context application communication module, result is returned to each application.
Step 2, contextual information processing module receive this application request and judge the type of this application request, call corresponding unit and carry out following processing:
If user's inquiry request is given contextual information query unit; Contextual information query unit is called the knowledge information access unit in administration module, carries out query engine, inquiry instances of ontology information, and return to context application;
If user's subscribe request is given contextual information subscriber units; Contextual information subscriber units, according to different action types, is called the corresponding units of administration module: if upgrade operation, call knowledge information updating block, upgrade subscription information storehouse; If accessing operation, calls knowledge information access unit, storage subscription information;
If user formulates the request of inference rule, give contextual information inference rule unit; Contextual information inference rule unit, according to different action types, calls the corresponding units of administration module: if upgrade operation, call knowledge information updating block, update rule storehouse; If accessing operation, calls knowledge information access unit, store this rule;
When the knowledge information updating block of administration module is carried out information update operation, the contextual information notification unit in context application processing module is carried out following content of operation (referring to Fig. 3):
(1) contextual information notification unit calls knowledge information access unit, reads and this time processes relevant instances of ontology file, and the subscription file that instances of ontology history file and instances of ontology are corresponding, creates queue, the subscription information of storage context application;
(2) judge whether queue is empty, and empty if, the processing of notification context application processing module finishes; If be not empty, from queue, take out an application, and carry out following notifier processes for this application:
(21) call knowledge information access unit, obtain the subscription information of context application, and according to this subscription information, obtain corresponding contextual information;
(22) encapsulation meets the contextual information that upper layer application is subscribed to, and calls context application communication unit, and this contextual information is passed to upper layer application.
Referring to Fig. 4, introduce each operation steps of contextual information treatment scheme from bottom to top:
Step 1, collector communication module comprise customer position information, environmental information, user terminal information, the network information by the various sensor collections of physics, logic, software, and user agent's information all reports the contextual information processing module of this application platform;
Step 2, contextual information processing module are accepted the contextual information from collector communication module, call context ontology instantiation unit, according to corresponding ontology model, create instances of ontology model;
Step 3, contextual information processing module are called collision detection unit, and instances of ontology data are carried out to collision detection; The semantic information of recycling context ontology, carries out data consistent check; According to historical data, eliminate the data with noise;
Step 4, contextual information processing module are called contextual information reasoning element, load inference machine, the reasoning of Execution context information (detailed reasoning process is shown in Figure 5);
Step 5, contextual information reasoning element have obtained new high-rise contextual information, call the knowledge information access unit of administration module, upgrade instances of ontology data; Call knowledge information access unit, querying information of subscription storehouse, judges whether this storehouse operation of refreshing one's knowledge is associated with the subscription information of some context application simultaneously; If there is no corresponding subscription information, this processing contextual information flow process finishes; If there is subscription information, call contextual information notification unit, to the up-to-date contextual information of context applicative notifications of subscribing to this instances of ontology partial information.
Referring to Fig. 5, introduce the reasoning flow operations content of the contextual information in above-mentioned steps 4:
(1) contextual information processing module is called contextual information reasoning element, processes the contextual information that collector reports.
(2) inference rule first carrying according to Jena, the contextual information that is implied in reasoning; For example collector report of user A is at meeting room 506, and in structure trunk instance model, having defined meeting room 506 is in No. three building of teaching building, and implicit contextual information is exactly that user A is in No. three building of teaching building.
(3) call the inference rule that knowledge information access unit reads upper layer application definition, judge whether to carry out reasoning; If can not, this does not have reasoning operation, finishes this operation; If reach reasoning requirement, regular by inference, call knowledge information access unit, obtain ontology model and instances of ontology data that reasoning is relevant, and be loaded into the general rule inference machine of Jena, carry out reasoning, obtain the reasoning results.
Step 4, obtains high-rise contextual information by reasoning module place, calls ontology information access module, upgrades instances of ontology data; Call subscription information access module, querying information of subscription storehouse, judges whether this storehouse operation of refreshing one's knowledge is associated with the subscription information of some context application simultaneously.
(4) by contextual information reasoning element, obtain high-rise contextual information, call knowledge information access unit, upgrade instances of ontology data; Call knowledge information access unit, querying information of subscription storehouse, judges whether this storehouse operation of refreshing one's knowledge is associated with the subscription information of some context application simultaneously;
(5), if there is no corresponding subscription information, this processing contextual information flow process finishes; If had, call contextual information notification unit, to the up-to-date contextual information of context applicative notifications of subscribing to this instances of ontology partial information.
The information storage means of Knowledge information library 104 of the present invention has two kinds: database storage and file storage; The read-write operation of the domain knowledge of wherein storing for database is the concurrent synchro control mechanism that adopts database itself; And synchronous for each file access in file storage is the synchro control mechanism that the file access lock unit in administration module is carried out.
File synchronization addressed location treatment scheme is as follows:
The access synchronized of file is that the administration module in Fig. 1 is controlled, and the modules in application platform is also realized by administration module the read-write operation of file.
Referring to Fig. 6, the detailed process of introducing application platform modules access file of the present invention is as follows:
(A) when the modules of this application platform need to carry out read-write operation to the associated documents in Knowledge information library, call respectively knowledge information updating block or knowledge information access unit in administration module, realize the operation to file.
(B) knowledge information updating block or knowledge information access unit to the request of file access lock unit the access right to file: be divided into the power of reading and two kinds of the powers of amendment; The cardinal rule of synchro control is: a plurality of threads can have the power of reading simultaneously, but can only have sometime a thread to have the power of amendment, and other threads now can not obtain the power of reading, and can not obtain the power of amendment.
(C), when file destination is current while being revised by any thread, current thread just can obtain that reading of file weighed or the power of amendment of file; If current thread obtains the access right of associated documents, administration module correlation unit is to the corresponding document read-write operation of being correlated with; Otherwise, after the time delay of setting, continue the access right of demand file.
(D) correlation unit of administration module discharges the access right to associated documents by file access lock unit.
The present invention has carried out implementing test, and the result of test is successfully, has realized goal of the invention.

Claims (5)

1. the context perception application platform based on body, is characterized in that: this platform is provided with following function module:
Collector communication module, be responsible for communicating by letter between this context perception application platform and bottom sensor, this collector communication module is the JADE software architecture of using a kind of relevant regulations of following the open standard FIPA of agency plant, realizing agency plant, and each in this collector communication module acted on behalf of between agent and used Agent communication language ACL to communicate;
Contextual information processing module, is responsible for the contextual information receiving from collector communication module to process, and is provided with collision detection, contextual information instances of ontology and three unit of contextual information reasoning; The function of three unit in this contextual information processing module is respectively:
Contextual information instances of ontology unit, be responsible for creating the function of instances of ontology, for accepting calling of contextual information processing module, after the various information that comprise location context, terminal context, network context, environmental context that parsing receives, according to the corresponding ontology model in Knowledge information library, create instances of ontology model;
Collision detection unit, is responsible for contextual information to carry out the detection of various data collisions, and according to different application scenarioss, colliding data is processed, or directly abandon the colliding data of this time, or obtain conforming data according to user's historical information;
Contextual information reasoning element, be responsible for utilizing the content of storing in Knowledge information library in platform to carry out interactivity reasoning, and use respectively the built-in inference rule of Jena rule-based reasoning system loads and self-defining inference rule to carry out reasoning, the former is for solving the inconsistency of contextual information and implicit contextual information, the latter is according to a plurality of contextual informations, derivation or more abstract, the high-rise contextual information of deducing, to provide the more useful contextual information of context application;
Administration module, is in charge of Knowledge information library, accepts calling of contextual information processing module and context application processing module, and Knowledge information library is carried out to synchro control, reaches the object of sharing knowledge base; Be provided with knowledge information updating block, knowledge information access unit and file access lock unit; The bookkeeping function that three unit in this administration module are carried out is respectively:
Knowledge information updating block, is responsible for upgrading instances of ontology database data: the solicited message of upgrading custom rule according to context application is added new regulation to rule base, or the rule in deletion rule storehouse; According to context application, upgrade the solicited message of subscribing to, in subscription information storehouse, add subscription information or delete subscription information;
Knowledge information access unit, is responsible for storage general field ontology library, creates the ontology model in specific area; Inquiry and storage instances of ontology data are to instances of ontology storehouse; Rule Information in inquiry and storage rule storehouse; Upper layer application subscription information in inquiry and storage subscription information storehouse;
File access lock unit, is responsible in this application platform from top to bottom and from bottom to top during disposal route, information in synchro control Knowledge information library;
Knowledge information library, all knowledge informations of responsible this platform of storage and maintenance, are provided with ontology library, instances of ontology storehouse, rule base and subscription information storehouse, use Jena language manipulation Knowledge information library, usage data storehouse Mysql or file stored knowledge information bank; Ontology library wherein stores the description to various contextual information models, instances of ontology stock contains the contextual information obtaining through the contextual information of collision detection and reasoning, rule base stores the self-defining specific inference rule of upper layer application, and subscription information stock contains upper layer application and uses this platform that the information of service is provided; And the storage information of classifying in two ways: a kind of is permanent database storage mode, for storing the little or substantially constant information of change frequency of the historical example of ontology library and body; Another kind is at local internal memory, to create ontology file to store, for storing knowledge information frequent use, that comprise subscription information storehouse, rule base, body latest instance data; Adopt above-mentioned storage mode obviously to provide running efficiency of system, meet knowledge information of a great variety, store complicated feature;
Context application processing module, is responsible for the request of response context application, is provided with four unit that contextual information inquiry, contextual information subscription, contextual information notice and contextual information inference rule are formulated; Four Elementary Functions in this context application processing module are respectively:
Contextual information query unit, be responsible for processing context application query context information request, query statement is used SPARQL language to be described, this SPARQL language is for a kind of defined query language of RDF data model and data acquisition protocols of developing for W3C of unified resource describing framework RDF exploitation, also can be used in the information resources that any employing RDF represents;
Contextual information subscriber units, be responsible for the request of the subscription context information of context application to process, call knowledge information access unit and knowledge information updating block in administration module, storage, renewal subscription information, the below up-to-date contextual information of applicative notifications so that platform makes progress in time; By this unit, the inquiry to subscription information, the retouching operation of additions and deletions applied in context;
Contextual information notification unit, is responsible for the based on context subscription information of application, in time to the ordered contextual information of applicative notifications;
Contextual information inference rule is formulated unit, is responsible for processing the inference rule that context application is formulated, and comprises the inquiry to inference rule, the retouching operation of additions and deletions, for the reasoning element in contextual information processing module, according to these inference rules, carries out reasoning;
Context application communication module, applies the entrance that service is provided to context as this platform, this module is equivalent to a message distributor, is responsible for accepting the request of context application, and different application messages is transmitted to different context application.
2. a contextual information disposal route that adopts the context perception application platform based on body claimed in claim 1, it is characterized in that: should adopt the method that comprises inquiry, subscribes to, lays down a regulation by the context perception application platform based on body, for the application of exploitation context provides service support; For the various physics of bottom, logical sensor, software sensors, should pass through Java intelligent body development platform JADE by the context perception application platform based on body, after the contextual information that collection distributed sensor gathers, these contextual informations are focused on; This context perception application platform is divided into two separate processing procedures from top to bottom following and from bottom to top to the processing of contextual information, and by synchro control make two kinds for the treatment of schemees from top to bottom and from bottom to top mutually transparent, be independent of each other;
Described contextual information treatment scheme is from bottom to top: by physical sensors, software sensors, logical sensor and user profile, act on behalf of to obtain primal environment, equipment and user's context, and obtain rudimentary contextual information through preliminary abstract and processing; By contextual information instances of ontology unit, contextual information is illustrated as having to semantic instances of ontology model again; Then by collision detection unit, eliminate noisy contextual information; Utilization comprises uses the ontology inference of description logic and the inference mechanism of the Ontology based on User Defined rule-based reasoning to obtain senior contextual information, by the renewal of Context Knowledge information bank, store and management context; This contextual information treatment scheme from bottom to top comprises following operation steps:
(1) collector communication module by the various sensor collections of physics, logic, software comprise customer position information, environmental information, user terminal information, the network information, and user agent's information all reports the contextual information processing module of this application platform;
(2) contextual information processing module is accepted the contextual information from collector communication module, calls contextual information instances of ontology unit, according to corresponding ontology model, creates instances of ontology model;
(3) contextual information processing module is called collision detection unit, and instances of ontology data are carried out to collision detection; The semantic information of recycling context ontology, carries out data consistent check; According to historical data, eliminate the data with noise;
(4) contextual information processing module is called contextual information reasoning element, loads inference machine, the reasoning of Execution context information;
(5) if contextual information reasoning element is not released new high-rise contextual information, this contextual information treatment scheme finishes; If contextual information reasoning element has obtained new high-rise contextual information, call the knowledge information access unit of administration module, upgrade instances of ontology data; Call knowledge information updating block, querying information of subscription storehouse, judges whether this storehouse operation of refreshing one's knowledge is associated with the subscription information of some context application simultaneously; If there is no corresponding subscription information, this processing contextual information flow process finishes; If had, call contextual information notification unit, to the up-to-date contextual information of context applicative notifications of subscribing to this instances of ontology partial information;
The top-down treatment scheme of described contextual information is: for the exploitation of context-aware applications provides service, support inquiry, subscription, notification context information and the self-defined inference rule of context application, this application platform provides application interface for context-aware applications developer, application developer by this interface inquiry, subscribe to and comprise rudimentary context and senior contextual contextual information; Developer can also pass through the self-defined inference rule of this interface, meets and provides personalized service for different application; Context perception application platform based on body returns to upper layer application by interface by announcement information; The top-down treatment scheme of this contextual information comprises following operation steps:
(1) context application, by context application communication module, sends application request to the context perception application platform based on body;
(2) contextual information processing module receives this application request and judges the type of this application request, calls corresponding unit and carries out following processing:
If user's inquiry request is given contextual information query unit; Contextual information query unit is called the knowledge information access unit in administration module, carries out query engine, inquiry instances of ontology information, and return to context application;
If user's subscribe request is given contextual information subscriber units; Contextual information subscriber units, according to different action types, is called the corresponding units of administration module: if upgrade operation, call knowledge information updating block, upgrade subscription information storehouse; If accessing operation, calls knowledge information access unit, storage subscription information;
If user formulates the request of inference rule, give contextual information inference rule unit; Contextual information inference rule unit, according to different action types, calls the corresponding units of administration module: if upgrade operation, call knowledge information updating block, update rule storehouse; If accessing operation, calls knowledge information access unit, store this rule.
3. method according to claim 2, is characterized in that: when the knowledge information updating block of administration module is carried out information update operation, the contextual information notification unit in context application processing module is carried out following content of operation:
(1) contextual information notification unit calls knowledge information access unit, reads and this time processes relevant instances of ontology file, and the subscription file that instances of ontology history file and instances of ontology are corresponding, creates queue, the subscription information of storage context application;
(2) judge whether queue is empty, and empty if, the processing of notification context application processing module finishes; If be not empty, from queue, take out an application, and carry out following notifier processes for this application:
Call knowledge information access unit, obtain the subscription information of context application, and according to this subscription information, obtain corresponding contextual information;
Encapsulation meets the contextual information that upper layer application is subscribed to, and calls contextual information notification unit, and this contextual information is passed to upper layer application.
4. method according to claim 2, is characterized in that: in described step (4), the reasoning of contextual information operation comprises following content:
(41) contextual information processing module is called contextual information reasoning element, processes the contextual information that collector reports;
(42) inference rule first carrying according to Jena, the contextual information that is implied in reasoning;
(43) call the inference rule that knowledge information access unit reads upper layer application definition, judge whether to carry out reasoning; If can not, this does not have reasoning operation, finishes this operation; If reach reasoning requirement, regular by inference, call knowledge information access unit, obtain ontology model and instances of ontology data that reasoning is relevant, and be loaded into the general rule inference machine of Jena, carry out reasoning, obtain the reasoning results;
(44) by contextual information reasoning element, obtain high-rise contextual information, call knowledge information access unit, upgrade instances of ontology data; Call knowledge information access unit, querying information of subscription storehouse, judges whether this storehouse operation of refreshing one's knowledge is associated with the subscription information of some context application simultaneously; If there is no corresponding subscription information, this processing contextual information flow process finishes; If had, call contextual information notification unit, to the up-to-date contextual information of context applicative notifications of subscribing to this instances of ontology partial information.
5. method according to claim 2, is characterized in that: the storage mode of described Knowledge information library has two kinds: database storage and file storage; Wherein the read-write operation of the domain knowledge of database storage adopts the concurrent synchro control mechanism of database itself; Each file access in file storage be synchronously that file access lock unit in administration module is controlled; This document synchronization of access cell processing flow process is as follows:
(A) when the associated documents in the Knowledge information library of this application platform carry out read-write operation, call respectively knowledge information updating block or knowledge information access unit in administration module, realize the operation to file;
(B) knowledge information updating block or knowledge information access unit to the request of file access lock unit the access right to file: be divided into and read two kinds of file and written documents; When file destination is current while being revised by any thread, current thread just can obtain that reading of file weighed or the power of amendment of file;
(C), if current thread obtains the operation power of associated documents, administration module correlation unit is to the corresponding document read-write operation of being correlated with; Otherwise, after the time delay of setting, continue the operation power of demand file;
(D) correlation unit of administration module is discharged the operation of associated documents is weighed by file access lock unit.
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