CN110376429A - A method of identification household electrical appliance use state - Google Patents
A method of identification household electrical appliance use state Download PDFInfo
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- CN110376429A CN110376429A CN201910493720.9A CN201910493720A CN110376429A CN 110376429 A CN110376429 A CN 110376429A CN 201910493720 A CN201910493720 A CN 201910493720A CN 110376429 A CN110376429 A CN 110376429A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Abstract
The invention discloses a kind of methods for identifying household electrical appliance use state, are related to electricity consumption judgment method.House person grasps identification household electrical appliance use state in real time at present, is very important with obtaining the daily work and rest rule of the elderly and physical condition.The present invention is the following steps are included: intelligent socket obtains the power information of coupled electrical equipment in real time；Power information is sent system cloud monitoring platform by intelligent socket；System cloud monitoring platform obtains the power information that intelligent socket is sent, and carries out the analysis of power information；According to unexpected message database data, unexpected message is sent to user associated by electrical equipment, identifies household electrical appliance use state.The technical program is analyzed by time piecewise analysis, duration, and whether comprehensive descision, identification household electrical appliance use state are normally in life with analyzing children under guardianship, precision of analysis height.
Description
Technical field
The present invention relates to electricity consumption judgment method more particularly to a kind of methods for identifying household electrical appliance use state.
Background technique
With the increasingly exacerbation of social senilization, Chinese the elderly is more and more, and shared population ratio is also higher and higher,
According to statistics, the elderly population in Zhejiang Province reach 10,800,000 people, wherein have quite a few old man because children be busy with one's work or
Strange land life causes unmanned company at one's side that may cannot achieve and actively seek help, or even jeopardize personal safety once meeting with surprisingly.
Therefore, house person grasps identification household electrical appliance use state in real time, to obtain the daily work and rest rule of the elderly and body shape
Condition is very important, more such especially for empty-nested elderly people.
There is Wang Yan in propositions [a kind of old man's crisis monitor device] in 2016 at present, including portable inspectiont trigger, always
People cares about host, power-supply management system, system cloud platform and mobile terminal, described portable to fall trigger and old man cares about host
Communication connection, surprisingly falls state or long-time stationary state for real-time detection old man carrier.But old man the elderly
Memory loss often forgets about carrying, does not have the effect of monitoring.
Popular bracelet has the functions such as rhythm of the heart, intelligent reminding, sleep monitor on the market, but many old age are not
Habit wears equipment on hand, often tries every possible means to take off equipment.
The intelligent socket of mainstream on the market is generally based on remotely controlling now, need user actively go to initiate this it is dynamic
Make, is not combined with old man's monitoring temporarily.
Summary of the invention
The technical problem to be solved in the present invention and the technical assignment of proposition are to be improved and improved to prior art,
A kind of method for identifying household electrical appliance use state is provided, to identify household electrical appliance use state, to reach monitoring life in old age
Purpose.For this purpose, the present invention takes following technical scheme.
A method of identification household electrical appliance use state, the following steps are included:
1) intelligent socket obtains the power information of coupled electrical equipment in real time；
2) power information is sent system cloud monitoring platform by intelligent socket；
3) system cloud monitoring platform obtains the power information that intelligent socket is sent, and carries out the analysis of power information, including basis
The electrical equipment type of intelligent socket connection carries out corresponding time piecewise analysis, duration analysis；
A) period analysis comprising steps of
A1 the data in setting time, electricity, power including electrical equipment) are obtained；
A2) when standby power/charge value of the power/charge value obtained in real time greater than corresponding equipment, and the above power of a bit
Less than or equal to standby power/charge value of equipment, that is, judge that equipment is opened in the upper time, then more by equipment real-time status
New is to open；
A3) when the power/charge value obtained in real time is less than or equal to standby power/charge value of equipment, and it is upper any power/
Charge value is greater than standby power/charge value of equipment, that is, judges that equipment is closed in the upper time, and equipment real-time status table will
State is updated to close；
A4 the working time section of corresponding electrical equipment) is obtained；If current time reaches the end time in the period,
The power consumption summation of equipment during this period of time is calculated, if power consumption summation is less than or equal to equipment during this period of time
Standby power summation, that is, illustrate that electrical equipment is not used during this period of time；
Alternatively, obtaining the working time section of corresponding electrical equipment；If current time reaches the end time in the period,
The difference of equipment highest electricity and minimum electricity during this period of time is then calculated, is set if difference was less than or equal in the period
The summation of the electricity of standby standby generation, that is, illustrate that equipment is not used during this period of time；
A5) more new equipment real-time status, equipment real-time status include not working to work in setting time in setting time；
A6 unexpected message database) is written into the electrical equipment not worked in setting time；
When electrical equipment is electric cooker:
B) duration analysis comprising steps of
B1 electrical equipment realtime power and its standby power) are obtained；
B2) when standby power of the power obtained in real time greater than equipment, and above the power of any is less than or equal to the standby function of equipment
Rate, i.e. equipment are opened in the upper time, then are updated to open by equipment real-time status；
B3) when standby power of the power obtained in real time greater than equipment, and above the power of any is greater than the standby power of equipment, i.e.,
Equipment is in and continues working state, equipment continuous work duration is calculated according to current time and opening of device time, if continuous work
Make duration and then generate exception information greater than rule settings duration, then judges that electrical equipment is in abnormality；If running hours
It is long to be less than or equal to rule settings duration, then modify the equipment duration；
B4) when standby power of the power of acquisition less than or equal to equipment, and above the power of any is greater than the standby power of equipment, i.e.,
Equipment is closed in the upper time, and equipment real-time status is updated to close；If upper some unit exception states are exception,
This equipment real-time status is filed, increases a new equipment real-time status record newly；If upper some unit exception states are positive
Often, then do not file；
B5) when the power obtained in real time is less than or equal to the standby power of equipment, and a bit upper power be less than or equal to equipment to
Machine power, i.e. equipment are in close state, and are not calculated；
B6) when the power obtained in real time is that sky then waits next point power, if continuous 3 points be it is empty if the real-time shape of more new equipment
The equipment state of state table is offline；
B7 unexpected message database) is written into the long electrical equipment for being greater than setting duration of running hours；
4) according to unexpected message database data, unexpected message is sent to user associated by electrical equipment, identifies household electrical appliance
Use state.
The technical program is analyzed by time piecewise analysis, duration, comprehensive descision, identification household electrical appliance use state, to divide
Whether analysis children under guardianship are normally in life, precision of analysis height.
As optimization technique means: intelligent socket sends power information to system cloud monitoring platform with the frequency of 1~6min；
System cloud monitoring platform analyzes power information with the corresponding time.
As optimization technique means: intelligent socket sends power information to system cloud monitoring platform with the frequency of 5min；System
System cloud monitoring platform analyzes corresponding power information with the time of 5min.
As optimization technique means: in step b6), when going up some power if it is empty, the point before taking 10 minutes is upper one
Point data；If the point before 10 minutes is also sky, taking first 15 minutes points is a upper point data, allows to have continuous 2 points to occur
The case where empty data.Influence of the shortage of data to analytical judgment is effectively reduced, the accuracy for improving analysis is conducive to.
As optimization technique means: in step 3), when system cloud monitoring platform carries out power information analysis, by same use
The power information of electrical equipment under family carries out comprehensive analysis, and arranges the stability bandwidth of the electricity consumption of its each electrical equipment rule
Sequence, and weighted value is arranged with the size of stability bandwidth, stability bandwidth is smaller, and weighted value is bigger, is set according to each electricity consumption under same user
Standby weighted value calculates the synthesis electricity consumption normal degree of the user.If the stability bandwidth of variation is smaller, illustrate that user power utilization more there are rule
Rule, weighted value is arranged according to this, thus calculates the electricity consumption normal degree of user, analyzes more accurate, and does not have to artificial setting, this
Method can be judged that suitability is good, and accuracy is higher automatically.
As optimization technique means: in step 3), electrical equipment being divided into multiclass, including electric cooker, water heater, sky
Tune, washing machine, television set, mobile phone, desk lamp carry out the period to electric cooker, desk lamp, duration is analyzed；To electric cooker, water heater,
Air-conditioning, mobile phone, desk lamp carry out duration analysis.Thus to analyze and determine whether the living habit of user changes, the life of user is practised
It is used whether healthy, to judge whether to need to carry out active warning to guardian.
As optimization technique means: further including behavioural analysis step；System cloud monitoring platform is sent out according to intelligent socket is obtained
The power information sent calculates electricity consumption user and corresponds to the period of electrical equipment electricity consumption, duration, to the time in the setting period
Section, duration carry out analytical calculation, obtain reference point, when the usage time interval of electrical equipment, duration are more than the range of reference point,
Think the user power utilization abnormal behavior, and notifies the guardian of corresponding user.
The utility model has the advantages that the technical program, which leads to intelligent socket, obtains corresponding power information, real-time monitoring the elderly's is common
The electricity consumption situation of electric appliance, and the data that the detection unit detects are sent to by household wifi by the household's mobile phone bound therewith
On, not in normal life rule state, it is old can to improve sky nest quickly to emergency contact's early warning detecting old man
While the living safety of people, moreover it is possible to the tie contacted as the children and parent for living in other places.
The technical program obtains transient current using the intelligent socket being arranged at family's electrical appliance or instantaneous power is believed
Number, the signal of acquisition is handled, the stable state/quasi-stability and transient characteristic of the signal are obtained, recycles to intersect and assigns weight method
The characteristic information of the signal is compared with the information in feature database, to debate the use state for knowing the household electrical appliance of access.
Algorithm of the invention is simple, accuracy of judgement, will not influence the normal operation of household appliance.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Fig. 2 is period analysis flow chart diagram of the invention.
Fig. 3 is duration analysis flow chart diagram of the invention.
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with Figure of description.
As shown in Figure 1, the present invention the following steps are included:
1) intelligent socket obtains the power information of coupled electrical equipment in real time；
2) power information is sent system cloud monitoring platform by intelligent socket；
3) system cloud monitoring platform obtains the power information that intelligent socket is sent, and carries out the analysis of power information, including basis
The electrical equipment type of intelligent socket connection carries out corresponding time piecewise analysis, duration analysis；
A) time piecewise analysis as shown in Fig. 2, itself comprising steps of
A1 the data in setting time, electricity, power including electrical equipment) are obtained；
A2) when standby power/charge value of the power/charge value obtained in real time greater than corresponding equipment, and the above power of a bit
Less than or equal to standby power/charge value of equipment, that is, judge that equipment is opened in the upper time, then more by equipment real-time status
New is to open；
A3) when the power/charge value obtained in real time is less than or equal to standby power/charge value of equipment, and it is upper any power/
Charge value is greater than standby power/charge value of equipment, that is, judges that equipment is closed in the upper time, and equipment real-time status table will
State is updated to close；
A4 the working time section of corresponding electrical equipment) is obtained；If current time reaches the end time in the period,
The power consumption summation of equipment during this period of time is calculated, if power consumption summation is less than or equal to equipment during this period of time
Standby power summation, that is, illustrate that electrical equipment is not used during this period of time；
Alternatively, obtaining the working time section of corresponding electrical equipment；If current time reaches the end time in the period,
The difference of equipment highest electricity and minimum electricity during this period of time is then calculated, is set if difference was less than or equal in the period
The summation of the electricity of standby standby generation, that is, illustrate that equipment is not used during this period of time；
A5) more new equipment real-time status, equipment real-time status include not working to work in setting time in setting time；
A6 unexpected message database) is written into the electrical equipment not worked in setting time；
When electrical equipment is electric cooker:
B) duration analysis as shown in figure 3, itself comprising steps of
B1 electrical equipment realtime power and its standby power) are obtained；
B2) when standby power of the power obtained in real time greater than equipment, and above the power of any is less than or equal to the standby function of equipment
Rate, i.e. equipment are opened in the upper time, then are updated to open by equipment real-time status；
B3) when standby power of the power obtained in real time greater than equipment, and above the power of any is greater than the standby power of equipment, i.e.,
Equipment is in and continues working state, equipment continuous work duration is calculated according to current time and opening of device time, if continuous work
Make duration and then generate exception information greater than rule settings duration, then judges that electrical equipment is in abnormality；If running hours
It is long to be less than or equal to rule settings duration, then modify the equipment duration；
B4) when standby power of the power of acquisition less than or equal to equipment, and above the power of any is greater than the standby power of equipment, i.e.,
Equipment is closed in the upper time, and equipment real-time status is updated to close；If upper some unit exception states are exception,
This equipment real-time status is filed, increases a new equipment real-time status record newly；If upper some unit exception states are positive
Often, then do not file；
B5) when the power obtained in real time is less than or equal to the standby power of equipment, and a bit upper power be less than or equal to equipment to
Machine power, i.e. equipment are in close state, and are not calculated；
B6) when the power obtained in real time is that sky then waits next point power, if continuous 3 points be it is empty if the real-time shape of more new equipment
The equipment state of state table is offline；
B7 unexpected message database) is written into the long electrical equipment for being greater than setting duration of running hours；
4) according to unexpected message database data, unexpected message is sent to user associated by electrical equipment, identifies household electrical appliance
Use state.
The technical program is analyzed by time piecewise analysis, duration, comprehensive descision, identification household electrical appliance use state, analysis
Accuracy is high.
The technical program obtains transient current using the intelligent socket being arranged at family's electrical appliance or instantaneous power is believed
Number, the signal of acquisition is handled, the stable state/quasi-stability and transient characteristic of the signal are obtained, recycles to intersect and assigns weight method
The characteristic information of the signal is compared with the information in feature database, to debate the use state for knowing the household electrical appliance of access.
Algorithm of the invention is simple, accuracy of judgement, will not influence the normal operation of household appliance.
To take into account the accuracy of data and the simplicity of calculating: intelligent socket is with the frequency of 5min to system cloud monitoring platform
Send power information；System cloud monitoring platform analyzes power information with the corresponding time.
For the accuracy for improving analysis, in step b6), when going up some power if it is empty, the point before taking 10 minutes is upper
One point data；If the point before 10 minutes is also sky, taking first 15 minutes points is a upper point data, allows to have continuous 2 to point out
The case where existing sky data.Influence of the shortage of data to analytical judgment is effectively reduced, the accuracy for improving analysis is conducive to.
It is judged automatically to realize, in step 3), when system cloud monitoring platform carries out power information analysis, by same user
Under the power information of electrical equipment carry out comprehensive analysis, and the stability bandwidth of the electricity consumption of its each electrical equipment rule is arranged
Sequence, and weighted value is arranged with the size of stability bandwidth, stability bandwidth is smaller, and weighted value is bigger, is set according to each electricity consumption under same user
Standby weighted value calculates the synthesis electricity consumption normal degree of the user.If the stability bandwidth of variation is smaller, illustrate that user power utilization more there are rule
Rule, weighted value is arranged according to this, thus calculates the electricity consumption normal degree of user, analyzes more accurate, and does not have to artificial setting, this
Method can be judged that suitability is good, and accuracy is higher automatically.
For the accuracy for improving judgement: in step 3), electrical equipment being divided into multiclass, including electric cooker, water heater, sky
Tune, washing machine, television set, mobile phone, desk lamp carry out the period to electric cooker, desk lamp, duration is analyzed；To electric cooker, water heater,
Air-conditioning, mobile phone, desk lamp carry out duration analysis.Thus to analyze and determine whether the living habit of user changes, the life of user is practised
It is used whether healthy, to judge whether to need to carry out active warning to guardian.
To realize the ability automatically analyzed: the invention also includes behavioural analysis steps；System cloud monitoring platform is according to acquisition
The power information that intelligent socket is sent, calculates electricity consumption user and corresponds to the period of electrical equipment electricity consumption, duration, to the setting period
Interior period, duration carry out analytical calculation, obtain reference point, when the usage time interval of electrical equipment, duration are more than reference point
Range when, it is believed that the user power utilization abnormal behavior, and notify the guardian of corresponding user.
Shown in figure 1 above -3 it is a kind of identify household electrical appliance use state method be specific embodiments of the present invention,
Substantive distinguishing features of the present invention and progress are embodied, it can be carried out under the inspiration of the present invention using needs according to actual
The equivalent modifications of shape, structure etc., the column in the protection scope of this programme.
Claims (7)
1. a kind of method for identifying household electrical appliance use state, it is characterised in that the following steps are included:
1) intelligent socket obtains the power information of coupled electrical equipment in real time；
2) power information is sent system cloud monitoring platform by intelligent socket；
3) system cloud monitoring platform obtains the power information that intelligent socket is sent, and carries out the analysis of power information, including basis
The electrical equipment type of intelligent socket connection carries out corresponding time piecewise analysis, duration analysis；
A) period analysis comprising steps of
A1 the data in setting time, electricity, power including electrical equipment) are obtained；
A2) when standby power/charge value of the power/charge value obtained in real time greater than corresponding equipment, and the above power of a bit
Less than or equal to standby power/charge value of equipment, that is, judge that equipment is opened in the upper time, then more by equipment real-time status
New is to open；
A3) when the power/charge value obtained in real time is less than or equal to standby power/charge value of equipment, and it is upper any power/
Charge value is greater than standby power/charge value of equipment, that is, judges that equipment is closed in the upper time, and equipment real-time status table will
State is updated to close；
A4 the working time section of corresponding electrical equipment) is obtained；If current time reaches the end time in the period,
The power consumption summation of equipment during this period of time is calculated, if power consumption summation is less than or equal to equipment during this period of time
Standby power summation, that is, illustrate that electrical equipment is not used during this period of time；
Alternatively, obtaining the working time section of corresponding electrical equipment；If current time reaches the end time in the period,
The difference of equipment highest electricity and minimum electricity during this period of time is then calculated, is set if difference was less than or equal in the period
The summation of the electricity of standby standby generation, that is, illustrate that equipment is not used during this period of time；
A5) more new equipment real-time status, equipment real-time status include not working to work in setting time in setting time；
A6 unexpected message database) is written into the electrical equipment not worked in setting time；
When electrical equipment is electric cooker:
B) duration analysis comprising steps of
B1 electrical equipment realtime power and its standby power) are obtained；
B2) when standby power of the power obtained in real time greater than equipment, and above the power of any is less than or equal to the standby function of equipment
Rate, i.e. equipment are opened in the upper time, then are updated to open by equipment real-time status；
B3) when standby power of the power obtained in real time greater than equipment, and above the power of any is greater than the standby power of equipment, i.e.,
Equipment is in and continues working state, equipment continuous work duration is calculated according to current time and opening of device time, if continuous work
Make duration and then generate exception information greater than rule settings duration, then judges that electrical equipment is in abnormality；If running hours
It is long to be less than or equal to rule settings duration, then modify the equipment duration；
B4) when standby power of the power of acquisition less than or equal to equipment, and above the power of any is greater than the standby power of equipment, i.e.,
Equipment is closed in the upper time, and equipment real-time status is updated to close；If upper some unit exception states are exception,
This equipment real-time status is filed, increases a new equipment real-time status record newly；If upper some unit exception states are positive
Often, then do not file；
B5) when the power obtained in real time is less than or equal to the standby power of equipment, and a bit upper power be less than or equal to equipment to
Machine power, i.e. equipment are in close state, and are not calculated；
B6) when the power obtained in real time is that sky then waits next point power, if continuous 3 points be it is empty if the real-time shape of more new equipment
The equipment state of state table is offline；
B7 unexpected message database) is written into the long electrical equipment for being greater than setting duration of running hours；
4) according to unexpected message database data, unexpected message is sent to user associated by electrical equipment, identifies household electrical appliance
Use state.
2. it is according to claim 1 it is a kind of identify household electrical appliance use state method, it is characterised in that: intelligent socket with
The frequency of 1~6min sends power information to system cloud monitoring platform；System cloud monitoring platform is with the corresponding time to telecommunications
Breath is analyzed.
3. it is according to claim 2 it is a kind of identify household electrical appliance use state method, it is characterised in that: intelligent socket with
The frequency of 5min sends power information to system cloud monitoring platform；System cloud monitoring platform is with the time of 5min to corresponding telecommunications
Breath is analyzed.
4. a kind of method for identifying household electrical appliance use state according to claim 3, it is characterised in that: in step b6),
When going up some power if it is empty, the point before taking 10 minutes is a upper point data；If the point before 10 minutes is also sky, first 15 points are taken
The point of clock is a upper point data, allows to have continuous 2 points the case where empty data occur.
5. a kind of method for identifying household electrical appliance use state according to claim 4, it is characterised in that: in step 3)
In, when system cloud monitoring platform carries out power information analysis, the power information of the electrical equipment under same user is integrated
Analysis, and the stability bandwidth of the electricity consumption of its each electrical equipment rule is ranked up, and weighted value, wave are arranged with the size of stability bandwidth
Dynamic rate is smaller, and weighted value is bigger, according to the weighted value of each electrical equipment under same user, is calculating the synthesis electricity consumption of the user just
Chang Chengdu.
6. a kind of method for identifying household electrical appliance use state according to claim 5, it is characterised in that: in step 3)
In, electrical equipment is divided into multiclass, including electric cooker, water heater, air-conditioning, washing machine, television set, mobile phone, desk lamp, to electric meal
It stews, desk lamp carries out the period, duration analysis；Duration analysis is carried out to electric cooker, water heater, air-conditioning, mobile phone, desk lamp.
7. a kind of method for identifying household electrical appliance use state according to any claim from 1 to 6, feature
It is: further includes behavioural analysis step；The power information that system cloud monitoring platform is sent according to intelligent socket is obtained, calculates the use
Electric user corresponds to the period of electrical equipment electricity consumption, duration, carries out analytical calculation to the period in the setting period, duration, obtains
To reference point, when the usage time interval of electrical equipment, duration are more than the range of reference point, it is believed that the user power utilization behavior is different
Often, and the guardian of corresponding user is notified.
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| CN111123720A (en) * | 2019-12-11 | 2020-05-08 | 海尔优家智能科技（北京）有限公司 | Equipment self-cleaning reminding method, system and server |
| CN111126896A (en) * | 2019-11-22 | 2020-05-08 | 青岛聚看云科技有限公司 | Information query method and device based on intelligent home system |
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| CN111738681A (en) * | 2020-06-17 | 2020-10-02 | 浙江大学 | Intelligent disinfection behavior judgment system and method based on deep learning and intelligent socket |
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| WO2022068951A1 (en) * | 2020-11-19 | 2022-04-07 | 青岛海尔洗衣机有限公司 | Control method for smart home system |
| CN115792479A (en) * | 2023-02-08 | 2023-03-14 | 东营市建筑设计研究院 | Intelligent power consumption monitoring method and system for intelligent socket |
| CN117092957A (en) * | 2023-10-16 | 2023-11-21 | 山东恒迈信息科技有限公司 | Intelligent electricity safety supervision method and system based on Internet of things |
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Inventor after: Liu Yangfu Inventor after: Yan Xianzheng Inventor after: Lu Shenxiong Inventor after: Cai Qihong Inventor after: Chen Danfei Inventor after: Chen Xiao Inventor after: Xu Shengyi Inventor after: Tan Yi Inventor after: Peng Shuangwu Inventor after: Hong Jianshan Inventor after: Qiu Weihao Inventor after: Zhang Wei Inventor after: Shen Hao Inventor after: Ding Qi Inventor after: Ye Sheng Inventor after: Shen Ran Inventor after: Jin Liangfeng Inventor before: Liu Yangfu Inventor before: Yan Xianzheng Inventor before: Lu Shenxiong Inventor before: Cai Qihong Inventor before: Chen Danfei Inventor before: Chen Xiao Inventor before: Xu Shengyi Inventor before: Tan Yi Inventor before: Peng Shuangwu Inventor before: Hong Jianshan Inventor before: Qiu Weihao Inventor before: Zhang Wei Inventor before: Shen Hao Inventor before: Ding Qi Inventor before: Ye Sheng Inventor before: Shen Ran Inventor before: Jin Liangfeng |