CN102122254A - Smart space perception method based on logic clock - Google Patents
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Abstract
The invention discloses a smart space perception method based on a logic clock, comprising the following steps: firstly, installing sensing equipment in the asynchronous network computing environment; sending environmental data to an environmental data processing process by the sensing equipment; packaging the environmental data into the local state by the environmental data processing process; mutually sending specific types of information among multiple environmental data processing processes to build the logic clock; sending the local state with the logic clock to an environment perception detecting process; collecting the information sent by all processing processes through the detecting process to build a consistent global state; detecting the protocol of a smart space description predicate; and detecting the predicate to sense the environmental state. With the method, the precedence relationship transferred and brought by the information, on the logic clock is utilized, the time characteristic information of the environmental data of the smart space is modelled, the influence of the asynchronism of the network computing environment on the perception is shielded, and the consistent global state of the smart space can be simply obtained, thereby bringing convenience for realizing smart space perception.
Description
Technical field
The invention belongs to computer application field, be specifically related to a kind of under the asynchronous network computing environment intelligent space cognitive method of logic-based clock.
Background technology
Actual environment is an opening, dynamic, asynchronous environment, and in network technology highly developed today, we can come the perception environment by dispose some sensing equipments in environment.The environmental data that existing cognition technology depends on the zones of different of collecting has these characteristics of global clock, yet such hypothesis is invalid in the true general calculation entironment that distributes.Because sensing equipment is distributed in the environment, and adopt radio communication mostly, inevitably have the time-delay that to estimate; Simultaneously, some sensing equipments can remake the environmental data buffer memory regular hour of collecting distribution for the consideration to aspect such as energy-conservation, and these have all increased the asynchronism between different sensing equipments.
Under the open general calculation entironment, the context-aware technology is the computer utility means that are used for a kind of mature and reliable of open, the dynamic environment of perception.The prerequisite of using is to need perception environment on every side, and when surrounding environment satisfied some conditions, application need was made corresponding adjustment and conformed.It is a kind of popular means that realize context-aware that predicate detects, and whether the basic process that predicate detects is to use to propose the stipulations to environmental characteristics, collects the data in the environment then, detect stipulations thereon and set up.
Context in the environment is distributed in this environment, and the sensing equipment that is used for the perception environment also is distributed in environment, owing to be asynchronous between the sensing equipment, therefore the environment that perceives is an asynchronous environment.Prior art is carried out the predicate detection and is lacked good support in asynchronous environment, the consistent global state that how to obtain asynchronous environment also is a difficult problem.In this simultaneously, logical timer is a kind of technology that is widely used in the distributed environment, can reach a kind of synchronous effect that is similar to by the service logic clock between asynchronous process, how be applied in logical timer in the intelligent space perception and reach the problem that similar synchronous effect is a network field.
Summary of the invention
Technical matters to be solved by this invention provides a kind of intelligent space cognitive method of logic-based clock, and it can pass through the service logic clock, reaches the purpose of intelligent perception environment in asynchronous environment.
In order to solve the problems of the technologies described above, the intelligent space cognitive method of a kind of logic-based clock that the present invention proposes, it mainly may further comprise the steps:
1) in the asynchronous network computing environment, sensing equipment is installed, environmental data is sent to the environmental data treatment progress by sensing equipment;
2) the environmental data treatment progress is packaged into local state with environmental data;
3) send particular type message between a plurality of environmental data treatment progress mutually and set up logical timer;
4) the environmental data treatment progress local state that will have a logical timer sends to the environment sensing detection procedure;
5) the environment sensing detection procedure is collected the consistent global state of information architecture that all environmental data treatment progress are sent;
6) the environment sensing detection procedure is carried out the detection that intelligent space is described predicate on consistent global state, notification application when the predicate stipulations are set up, thus so detect the perception ambient condition by predicate.
Whole structure as shown in Figure 1.
Above-mentioned steps 1) detailed process is:
11) sensing equipment that deployment needs use is installed in the asynchronous network computing environment;
12) set the frequency acquisition of sensing equipment image data and the time of delayed delivery;
The access of sensing equipment need provide relevant parameters.The given needs of parameter are followed unified standard, so can make things convenient for the environmental data treatment progress to collect the environmental data of different sensing equipments.The description of parameter must be followed DTD standard as shown in Figure 4, and the setting of the sensing equipment parameter of a typical R FID Reader as shown in Figure 5.
13) image data and send to the environmental data treatment progress according to the send mode of setting.
Above-mentioned steps 2) detailed process is:
21) the environmental data treatment progress calculates the local predicate proposition that is defined on this process according to the environmental data of collecting, and obtains the value of local predicate;
22) the environmental data treatment progress is modeled as the environmental data of collecting according to the variation of the true and false value of local predicate the variation of local state.
The local predicate that is defined on the single environmental data treatment progress is LP
iWhether the environmental data treatment progress makes LP according to receiving all environmental datas
iEstablishment obtains the true of a string shape such as TTTFFFTTFFF..., the sequence that false replaces.The environmental data treatment progress is modeled as the alternate sequence of a series of local state and local event: E according to this string sequence that obtains with it
I, 0, S
I, 0, E
I, 1, S
I, 1, E
I, 2, S
I, 2....
Local event has three kinds:
A) transmit control message to other environmental data treatment progress;
B) receive the control messages that other environmental data treatment progress send;
C) true value of local predicate changes.
The local predicate value of all environmental datas is identical on the single local state between the local event.Like this, the environmental data that receives of single environmental data treatment progress just is modeled as the sequence of a string local state.As shown in Figure 2, the environmental data on each environmental data treatment progress all is modeled as the sequence of a string local state.Above-mentioned steps 3) detailed process is:
31) each environmental data treatment progress P
iAll safeguard the vectorial clock VC an of this locality, VC is one group of vector [t
1, t
2, t
3..., t
n], each element t
jCorresponding to an environmental data treatment progress P
j, its initial value be [0,0 ..., 0];
32) whenever environmental data treatment progress P
iOn local predicate when becoming true, send the control messages that includes local current VC vector clock (vectorial clock stamp) and give other environmental data treatment progress, increase corresponding local part, i.e. i the component t of local VC among the local vectorial clock VC simultaneously
iAdd 1;
33) whenever environmental data is handled into P
iOn local predicate when becoming false, increase corresponding local part, i.e. i the component t of local VC among the local vectorial clock VC
iAdd 1;
34) whenever receiving the control messages that includes its VC vector clock stamp that other environmental data treatment progress send, environmental data treatment progress P
iUpgrade the maximal value that local VC is each corresponding element in local and the control messages.
On all environmental data treatment progress, just safeguard a logical timer like this, a vectorial timestamp has all been arranged on each local state, that is, all had time response information.As shown in Figure 2, the local state on all environmental data treatment progress has all had vectorial timestamp.
Above-mentioned steps 4) detailed process is: as each environmental data treatment progress P
iWhen a new local state that has a vectorial timestamp occurring, send detect-message to the environment sensing detection procedure, detect-message wherein is and has local predicate LP
iValue and the local state of vectorial timestamp.
Above-mentioned steps 5) detailed process is:
51) the local state sent according to each environmental data treatment progress of receiving of environment sensing detection procedure makes up consistent global state Snapshot, is specially:
Suppose total n environmental data treatment progress, G={S
1, S
2, S
3..., S
nBe a global state, S
iBe environmental data treatment progress P
iOn local state; The condition that global state C is consistent global state Snapshot is, and if only if any two local state S that C comprises
i, S
jBetween vectorial timestamp do not have magnitude relationship, i.e. S
i.VC ≮ S
j.VC and S
i.VC ≯ S
j.VC;
Above-mentioned two vectorial timestamp VC1, the magnitude relationship between the VC2 is defined as follows:
VC1＜VC2: among and if only if the VC1 each element all smaller or equal to corresponding element among the VC2, and exist at least one unequal, promptly to i:1≤i≤n arbitrarily, VC1.t
i≤ VC2.t
iAnd there is j:1≤j≤n, VC1.t
j≠ VC2.t
j
VC1=C2: each element all equals corresponding element among the VC2 among and if only if the VC1, promptly to i:1≤i≤n arbitrarily, and VC1.t
i=C2.t
i
51) a series of consistent global state of environment sensing detection procedure structure is formed a set, and a kind of precedence relationship of partial order is arranged between the consistent global state in the set.
Two consistent global state C1={S
11, S
12, S
13..., S
1n, C2={S
21, S
22, S
23..., S
2nBefore precedence relationship is defined as follows:
C1≤C2：C1.S
1i.VC≤C2.S
2i.VC，1≤i≤n；
Partial order precedence relationship between consistent global state set and the set interior element has a kind of lattice structure.As shown in Figure 3, each coordinate axis of this lattice structure is the local status switch that the environmental data treatment progress produces, each node is a consistent global state in the lattice structure, and the precedence relationship between the consistent global state is represented on the limit between with 2 o'clock on the lattice structure.
Above-mentioned steps 6) detailed process is:
61) the environment sensing detection procedure obtains the overall predicate stipulations that will detect from application program;
Overall situation predicate stipulations are meant the predicate that is defined on the consistent global state, and it is by obtaining by Boolean calculation between a plurality of local predicates.N environmental data treatment progress for example arranged, and each all has a local predicate LP above the environmental data treatment progress
i, an overall predicate can be LP so
1∧ LP
2∧ ... ∧ LP
n
We provide unified support for using the different overall predicate stipulations of proposition.The description of stipulations must be followed DTD standard as shown in Figure 6.The overall predicate stipulations of an exemplary scene are described as shown in Figure 7.
62) the environment sensing detection procedure is carried out the detection of overall predicate stipulations according to the overall predicate stipulations that obtain on the lattice structure of integrating, notification application when stipulations are set up, thus so detect the perception ambient condition by predicate.Can generate different detection algorithms at different overall predicates.
The present invention is directed to the characteristics that cognition technology is difficult to better be applicable to open, dynamic, asynchronous environment that have now, with in the asynchronous network computing environment to the contextual processing modeling of difference as the environmental data treatment progress, set up logical timer by sending message between the environmental data treatment progress mutually, the contextual information that will have logical timer sends to the environment sensing detection procedure to set up the lattice structure of consistent global state and consistent global state, and then detect thereon and use the overall predicate stipulations that propose, to reach the purpose of perception asynchronous network computing environment.Utilize logical timer to make in the environment on the context band and time response information shielded the influence of asynchronism to perception, making the consistent global state that obtains the asynchronous network computing environment no longer is a difficult problem, thereby makes the perception asynchronous environment become simple.
Description of drawings
Fig. 1 sensing equipment and interprocess communication structural drawing,
Send message between a plurality of environmental data treatment progress of Fig. 2 mutually and set up logical timer,
The lattice structure that all consistent global states of Fig. 3 constitute,
Fig. 4 sensor configuration is described DTD,
The configuration of Fig. 5 RFID Reader is described,
DTD is described in the configuration of Fig. 6 overall situation predicate stipulations,
The overall predicate stipulations configuration of Fig. 7 special scenes is described.
Embodiment
1, summarize the present invention according to above description, it mainly comprises the following aspects:
1) logical timer
Logical timer has played crucial effects in the methods of the invention.Logical timer among the present invention can reach the effect of synchronous asynchronous process.But also provide precedence relationship between all contexts.
Provide the computing method of logical timer below:
Suppose to have n environmental data treatment progress, each environmental data treatment progress P
iAll safeguard the vectorial clock VC[t an of this locality
1, t
2, t
3..., t
n], each element is corresponding to an environmental data treatment progress P
i, initial value be [0,0 ..., 0];
A) whenever environmental data treatment progress P
iOn local predicate when becoming true, send the control messages that includes local current VC vector clock (vectorial clock stamp) and give other environmental data treatment progress, increase corresponding local part, i.e. i the component t of local VC among the local vectorial clock VC simultaneously
iAdd 1;
B) whenever environmental data is handled into P
iOn local predicate when becoming false, increase corresponding local part, i.e. i the component t of local VC among the local vectorial clock VC
iAdd 1;
C) whenever receiving the control messages that includes its VC vector clock stamp that other environmental data treatment progress send, environmental data treatment progress P
iUpgrade the maximal value that local VC is each corresponding element in local and the control messages.
D) on all environmental data treatment progress, just safeguard a logical timer like this, a vectorial timestamp has all been arranged on each local state, that is, all had time response information.As shown in Figure 2, the local state on all environmental data treatment progress has all had vectorial timestamp.
2) consistent global state Snapshot's obtains
Obtaining of consistent global state snapshot is a difficult problem in the asynchronous network computing environment.In the present invention, by means of logical timer, consistent global state can obtain very easily.
Provide the method that obtains consistent global state below:
Suppose to have n environmental data treatment progress, each environmental data treatment progress P
iAll safeguard the vectorial clock VC[t an of this locality
1, t
2, t
3..., t
n].Each local state all has vectorial clock and stabs.All environmental data treatment progress send to the environment sensing detection procedure with local state.The environment sensing detection procedure receives that the message that these environmental data treatment progress send makes up consistent global state as follows:
On the local status switch that each environmental data treatment progress sends, get a local state, constitute a global state G={S
1, S
2, S
3..., S
n, S
iBe environmental data treatment progress P
iOn local state.The condition that global state C is consistent global state Snapshot is, and if only if any two local state S that C comprises
i, S
jBetween vectorial timestamp do not have magnitude relationship, i.e. S
i.VC ≮ S
j.VC and S
i.VC ≯ S
j.VC;
Above-mentioned two vectorial timestamp VC1, the magnitude relationship between the VC2 is defined as follows:
VC1＜VC2: among and if only if the VC1 each element all smaller or equal to corresponding element among the VC2, and exist at least one unequal, promptly to i:1≤i≤n arbitrarily, VC1.t
i≤ VC2.t
iAnd there is j:1≤j≤n, VC1.t
j≠ VC2.t
j
VC1=C2: each element all equals corresponding element among the VC2 among and if only if the VC1, promptly to i:1≤i≤n arbitrarily, and VC1.t
i=C2.t
i
Like this, by constantly receiving the local status message of sending from each environmental data treatment progress, the environment sensing detection procedure can construct all consistent global states.Whether each consistent global state has all comprised the true value of local predicate, and then can detect overall predicate stipulations thereon and set up.Precedence relationship in set that all consistent global states constitute and the set between element has constituted a lattice structure.Each coordinate axis of lattice structure is the local status switch of environmental data treatment progress, and each node is a consistent global state.Precedence relationship between the consistent global state is represented on the limit between with 2 o'clock on the lattice structure.
Two consistent global state C1={S
11, S
12, S
13..., S
1n, C2={S
21, S
22, S
23..., S
2nBefore precedence relationship is defined as follows:
C1≤C2：C1.S
1i.VC≤C2.S
2i.VC，1≤i≤n；
3) based on the environment sensing of Snapshot predicate
The consistent global state that obtains based on the environment sensing detection procedure and the lattice structure of its composition just can detect the stipulations of using proposition.For dissimilar stipulations different detection algorithms can be arranged.
Overall situation predicate stipulations are the predicates that are defined on the consistent global state, and it is by obtaining by Boolean calculation between a plurality of local predicates.N environmental data treatment progress for example arranged, and each all has a local predicate LP above the environmental data treatment progress
i, an overall predicate can be LP so
1∧ LP
2∧ ... ∧ LP
n
2, followingly come technical scheme of the present invention is described in detail by specific embodiment.
At first we describe a typical application scene.
For to energy-conservation consideration, when the people not in the room and the lamp in room when opening, should turn off lamp automatically.
Below we specifically describe concrete behavior in this scene in detail according to top step.
1. the user has bound a RFID tag tag_1 on one's body.Whether we detect the user whether in the room at RFID ReaderReader_1 of indoor installation, a light sensor Light_1 has been installed comes sense light opening indoor simultaneously.These two sensors all adopt radio communication.And for the consideration of power saving, they all with the metadata cache that collects in this locality, just sent a secondary data to the environmental data treatment progress that operates on the indoor station server every 5 minutes.Sensor is wanted to dispose and to be used some configuration informations need be provided.We have provided the DTD description that sensor configuration is described in Fig. 4.Fig. 5 has provided the configuration of RFID Reader and has described.Being provided with the transmission cycle is 5 minutes.
Using the stipulations that propose therefore is exactly (Reader_1 not-contain tag_1) ∧ (Light_1＞500).We think that the light intensity of sensing opening greater than 500 o'clock lamps.The DTD that the configuration of overall situation predicate is described describes as Fig. 6, and the configuration in this scene is described as Fig. 7.
2. on server, the environmental data treatment progress of a correspondence is arranged all corresponding to two sensors.Sensor is constantly collected environmental data, sends environmental data to the environmental data treatment progress according to the distribution cycle.The environmental data treatment progress is for thereon local predicate Reader_1 not-contain tag_1 and Light_1＞500 of definition, calculates the true value of the local predicate that the current environment data obtain, and the local state of modeling.
3. each environmental data treatment progress has all been safeguarded the vectorial clock an of this locality.When local predicate became true, the environmental data treatment progress transmitted control message (having vectorial timestamp) to another one environmental data treatment progress.As shown in Figure 2.
4. when having produced a local state on each environmental data treatment progress, all send it to the environment sensing detection procedure that operates on the server.
5. the local state sent of two environmental data treatment progress will collecting of environment sensing detection procedure is configured to a series of consistent global states, and it is configured to as shown in Figure 3 lattice structure.
6. whether the environment sensing detection procedure satisfies this overall predicate according to the consistent global state that overall predicate stipulations (Reader_1 not-contain tag_1) ∧ (Light_1＞500) detect in the lattice structure.
7. when overall predicate stipulations were set up, the application program that environment sensing detection procedure notice is installed on the lighting control circuit was turned off lamp.
Claims (7)
1. the intelligent space cognitive method of a logic-based clock, its feature mainly may further comprise the steps:
1) in the asynchronous network computing environment, sensing equipment is installed, environmental data is sent to the environmental data treatment progress by sensing equipment;
2) the environmental data treatment progress is packaged into local state with environmental data;
3) send particular type message between a plurality of environmental data treatment progress mutually and set up logical timer;
4) the environmental data treatment progress local state that will have a logical timer sends to the environment sensing detection procedure;
5) the environment sensing detection procedure is collected the consistent global state of information architecture that all environmental data treatment progress are sent;
6) the environment sensing detection procedure is carried out the detection that intelligent space is described predicate on consistent global state, notification application when the predicate stipulations are set up, thus so detect the perception ambient condition by predicate.
2. the intelligent space cognitive method of logic-based clock according to claim 1 is characterized in that the detailed process of step 1) is:
11) sensing equipment that deployment needs use is installed in the asynchronous network computing environment;
12) set the frequency acquisition of sensing equipment image data and the time of delayed delivery;
13) image data and send to the environmental data treatment progress according to the send mode of setting.
3. the intelligent space cognitive method of logic-based clock according to claim 1 and 2 is characterized in that step 2) detailed process be:
21) the environmental data treatment progress calculates the local predicate proposition that is defined on this process according to the environmental data of collecting, and obtains the value of local predicate;
22) the environmental data treatment progress is modeled as the environmental data of collecting according to the variation of the true and false value of local predicate the variation of local state.
4. the intelligent space cognitive method of logic-based clock according to claim 1 and 2 is characterized in that the detailed process of step 3) is:
31) each environmental data treatment progress P
iAll safeguard the vectorial clock VC an of this locality, VC is one group of vector [t
1, t
2, t
3..., t
n], each element t
jCorresponding to an environmental data treatment progress P
j, its initial value be [0,0 ..., 0];
32) whenever environmental data treatment progress P
iOn local predicate when becoming true, send the control messages that includes local current VC vector clock (vectorial clock stamp) and give other environmental data treatment progress, increase corresponding local part, i.e. i the component t of local VC among the local vectorial clock VC simultaneously
iAdd 1;
33) whenever environmental data is handled into P
iOn local predicate when becoming false, increase corresponding local part, i.e. i the component t of local VC among the local vectorial clock VC
iAdd 1;
34) whenever receiving the control messages that includes its VC vector clock stamp that other environmental data treatment progress send, environmental data treatment progress P
iUpgrade the maximal value that local VC is each corresponding element in local and the control messages.
5. the intelligent space cognitive method of logic-based clock according to claim 1 and 2 is characterized in that the detailed process of step 4) is: as each environmental data treatment progress P
iWhen a new local state that has a vectorial timestamp occurring, send detect-message to the environment sensing detection procedure, detect-message wherein is and has local predicate LP
iValue and the local state of vectorial timestamp.
6. the intelligent space cognitive method of logic-based clock according to claim 1 and 2 is characterized in that the detailed process of step 5) is:
51) the local state sent according to each environmental data treatment progress of receiving of environment sensing detection procedure makes up consistent global state Snapshot, is specially:
Suppose total n environmental data treatment progress, G={S
1, S
2, S
3..., S
nBe a global state, S
iBe environmental data treatment progress P
iOn local state; The condition that global state C is consistent global state Snapshot is, and if only if any two local state S that C comprises
i, S
jBetween vectorial timestamp do not have magnitude relationship, i.e. S
i.VC ≮ S
j.VC and S
i.VC ≯ S
j.VC;
Above-mentioned two vectorial timestamp VC1, the magnitude relationship between the VC2 is defined as follows:
VC1＜VC2: among and if only if the VC1 each element all smaller or equal to corresponding element among the VC2, and exist at least one unequal, promptly to i:1≤i≤n arbitrarily, VC1.t
i≤ VC2.t
iAnd there is j:1≤j≤n, VC1.t
j≠ VC2.t
j
VC1=C2: each element all equals corresponding element among the VC2 among and if only if the VC1, promptly to i:1≤i≤n arbitrarily, and VC1.t
i=C2.t
i
52) a series of consistent global state of environment sensing detection procedure structure is formed a set, and a kind of precedence relationship of partial order is arranged between the consistent global state in the set;
Two consistent global state C1={S
11, S
12, S
13..., S
1n, C2={S
21, S
22, S
23..., S
2nBefore precedence relationship is defined as follows:
C1≤C2：C1.S
1i.VC≤C2.S
2i.VC，1≤i≤n；
Partial order precedence relationship between consistent global state set and the set interior element has a kind of lattice structure; Each coordinate axis of this lattice structure is the local status switch that the environmental data treatment progress produces, and each node is a consistent global state in the lattice structure, and the precedence relationship between the consistent global state is represented on the limit between with 2 o'clock on the lattice structure.
7. the intelligent space cognitive method of logic-based clock according to claim 6 is characterized in that the detailed process of step 6) is:
61) the environment sensing detection procedure obtains the overall predicate stipulations that will detect from application program;
62) the environment sensing detection procedure is carried out the detection of overall predicate stipulations according to the overall predicate stipulations that obtain on the lattice structure of integrating, notification application when stipulations are set up, thus so detect the perception ambient condition by predicate.
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| CN111294310A (en) * | 2018-12-06 | 2020-06-16 | 上海西门子医疗器械有限公司 | Method for automatically extracting workflow and method for detecting intrusion in distributed system |
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Application publication date: 20110713 |