CN108806376A - A kind of remote interactive teaching method and device of Mobile Teaching resource - Google Patents
A kind of remote interactive teaching method and device of Mobile Teaching resource Download PDFInfo
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- CN108806376A CN108806376A CN201810624283.5A CN201810624283A CN108806376A CN 108806376 A CN108806376 A CN 108806376A CN 201810624283 A CN201810624283 A CN 201810624283A CN 108806376 A CN108806376 A CN 108806376A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/08—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations
- G09B5/14—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations with provision for individual teacher-student communication
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2141—Access rights, e.g. capability lists, access control lists, access tables, access matrices
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- General Physics & Mathematics (AREA)
- Computer Security & Cryptography (AREA)
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- General Engineering & Computer Science (AREA)
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- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Electrically Operated Instructional Devices (AREA)
Abstract
The invention discloses a kind of remote interactive teaching method and devices of Mobile Teaching resource, it is attached with the clients of one or more controlled screens by teaching resource in a control terminal synchronous, teaching resource is projected or is shared to electronic whiteboard by strict authorizing secure system, projecting apparatus, mobile device, or on PC, easily realize the Web-based instruction of omnibearing stereo formula, it can need not be equipped with the equipment such as computer or all-in-one machine in classroom, the floor space of required equipment is small, periodic maintenance expense is not needed, device it is very easy to use, one or more screen synch control screens can be supported to show, and support long-range control screen teaching, teleengineering support teaching resource is to multiple client.
Description
Technical field
This disclosure relates to digital education field, and in particular to a kind of the remote interactive teaching method and dress of Mobile Teaching resource
It sets.
Background technology
In traditional classroom instruction, blackboard is the primary position of teacher's teaching, with the continuous development of IT application in education sector, electricity
Sub- blank, which has gradually substituted blackboard, becomes the fresh position of teacher's teaching.Interaction efficiency possessed by electronic whiteboard is greatly promoted
The learning interest and enthusiasm of student, classroom instruction also become more lively excellent.Although information technology and classroom instruction
There is revolutionary breakthrough in integration, but teacher is still bound in around blank, it is difficult to go about and be moved in classroom
It is dynamic to give lessons, and can not achieve long-range teaching and teaching resource sharing.
With the fast development of online Web education, long-distance education has been to be concerned by more and more people, Mobile Teaching resource
And various teaching websites and net work teaching system emerge one after another, and abundant teaching resource are had accumulated on network, such as：PPT handouts,
Classroom video recording, knowledge point summary etc..However, each classroom must be equipped with the equipment such as a computer or all-in-one machine, required accounts for
Ground area is big, and consuming fund is more and periodically needs certain maintenance cost budget, very inconvenient.
Invention content
The purpose of the disclosure is in view of the deficiencies of the prior art, in order to which teacher uses mobile device or the ends PC in teaching
It is combined with projector or electronic whiteboard, so that it may to break the constraint at dais and traditional blackboard, really realize mobile teaching
And further realize remote teaching, provide a kind of remote interactive teaching method and device of Mobile Teaching resource, wherein described
Method includes the following steps：
Step 1, teaching controlling end connection remote teaching end；
Step 2, the teaching resource and permission of user is read at remote teaching end；
Step 3, remote teaching end verifying authorization；
Step 4, teaching resource is transmitted to remote teaching end by teaching controlling end after Authority Verification；
Step 5, teaching controlling end encrypts control instruction to obtain encrypted instruction and is transferred to remote teaching end；
Step 6, remote teaching end receives the encrypted instruction at teaching controlling end and is decrypted to obtain control instruction；
Step 7, remote teaching end is synchronized according to control instruction and remote teaching end.
Further, in step 1, the teaching controlling end includes smart mobile phone, tablet computer, desktop computer, pen
Remember this computer；The remote teaching end includes electronic whiteboard, projector, smart mobile phone, tablet computer, desktop computer, notes
This computer；The method of the connection is：The application at teaching controlling end is by WiFi, 4G/5G communication network one of which and at least
The application at one remote teaching end is communicated.
Further, in step 2, the teaching resource includes document, hht coursewares, video, audio, picture, wherein
The file class of document includes ppt, word, excel, txt；The file class of video include mov, mp4, rmvb, avi, flv,
f4v,mpeg,swf；The file class of audio includes .mp3, m4a, oga, ogg, wav；The file class of picture include jpg,
jpeg、gif、bmp、PNG、Tif。
Further, in step 2, the permission includes administrator right, teacher's permission, student's permission, middle pipe
Reason person's permission can access and change teaching resource, change and authorize user right；Teacher's permission adds new teaching resource simultaneously
And it controlled, deleted for the new teaching resource of this role addition, edit operation；And it can be to the document in its teaching resource
It the operations such as annotated, scaled, being rotated, while supporting the pause of control video, broadcasting, playing progress rate, volume.It can lead to
The PPT that camera carries out at remote teaching end on real-time live broadcast, remote operation screen or computer desktop is crossed to play and terminate to play,
PPT on large-size screen monitors or computer is loaded into play mode on remote teaching end and carries out simultaneous display, passes through gesture identification（Including
Single give directions hits, double-clicks scaling, double-clicks idler wheel）It annotated, screenshotss, play PPT, play operations, each teachers such as blank and include
The permission of teaching of one or more students；Student's permission is to participate in course by way of display, broadcasting, download teaching resource,
Each student at least belongs to teaching in permission in teacher.Teaching controlling end logon rights are administrator right, Jiao Shiquan
Limit；Remote teaching end logon rights are administrator right, teacher's permission, student's permission.
Further, in step 3, the method for remote teaching end verifying authorization is to judge the use at remote teaching end
Family permission, then judging the permission in the student if it is student's permission, whether the affiliated teacher that logs in current control terminal teaches
It is not to refuse inspection of books if it is by verification in permission；If it is administrator right or teacher's permission then directly by testing
Card.
Further, in steps of 5, the control instruction is to be annotated, scaled to the document in teaching resource, rotated
Operational order；Or pause, broadcasting, playing progress rate, the volume instruction of control video；Or remote operation screen or computer desktop
On PPT play and terminate to play or gesture identification, including single give directions hits, double-clicks scaling, double-click idler wheel, is annotated, section
Screen plays PPT, plays blank operational order.
Further, in steps of 5, the encrypted cipher mode is SHA256 algorithm for encryption.
Further, in step 6, the manner of decryption of the decryption is decrypted for SHA256 algorithms.
Further, in step 7, the remote teaching end synchronizes method according to control instruction and remote teaching end
Synchronous with the operation at remote teaching end for the operation at remote teaching end, the picture of both ends screen display is the same.
The present invention also provides a kind of remote interactive teaching devices of Mobile Teaching resource, which is characterized in that described device
Including：
Connection unit is controlled, for teaching controlling end connection remote teaching end；
Permission reading unit reads the teaching resource and permission of user for remote teaching end；
Authority Verification unit is used for remote teaching end verifying authorization；
Resource transmission unit, for transmitting teaching resource to remote teaching end by teaching controlling end after Authority Verification；
Encryption unit is instructed, encrypts control instruction to obtain encrypted instruction for teaching controlling end and is transferred to remote teaching end；
Instruction decryption unit, receives the encrypted instruction at teaching controlling end and is decrypted to obtain control and refer to for remote teaching end
It enables；
Remote synchronization unit is synchronized for remote teaching end according to control instruction and remote teaching end.
The disclosure has the beneficial effect that：The invention discloses a kind of remote interactive teaching method of Mobile Teaching resource and dresses
Set, by strict authorizing secure system by teaching resource project or share to electronic whiteboard, projecting apparatus, mobile device or
On person's PC, the Web-based instruction of omnibearing stereo formula is easily realized, it may be unnecessary to be equipped with computer or all-in-one machine in classroom
Etc. equipment, the floor space needed for equipment is small, does not need periodic maintenance expense, very easy to use, supports one or more screens
The synchronous control screen display of curtain, equipment safety is reliable, supports long-range control screen teaching, teleengineering support teaching resource.
Description of the drawings
By the way that the embodiment in conjunction with shown by attached drawing is described in detail, above-mentioned and other features of the disclosure will
More obvious, identical reference label indicates same or analogous element in disclosure attached drawing, it should be apparent that, in being described below
Attached drawing be only some embodiments of the present disclosure, for those of ordinary skill in the art, do not making the creative labor
Under the premise of, other drawings may also be obtained based on these drawings, in the accompanying drawings：
Fig. 1 show a kind of flow chart of the remote interactive teaching method of Mobile Teaching resource of the disclosure；
Fig. 2 show a kind of remote interactive teaching device of Mobile Teaching resource of disclosure embodiment.
Specific implementation mode
The technique effect of the design of the disclosure, concrete structure and generation is carried out below with reference to embodiment and attached drawing clear
Chu, complete description, to be completely understood by the purpose, scheme and effect of the disclosure.It should be noted that the case where not conflicting
Under, the features in the embodiments and the embodiments of the present application can be combined with each other.
As shown in Figure 1 for according to a kind of flow chart of the remote interactive teaching method of Mobile Teaching resource of the disclosure, under
Face illustrates a kind of remote interactive teaching method of Mobile Teaching resource according to embodiment of the present disclosure in conjunction with Fig. 1.
The disclosure proposes a kind of remote interactive teaching method of Mobile Teaching resource, wherein the method includes following steps
Suddenly：
Step 1, teaching controlling end connection remote teaching end；
Step 2, the teaching resource and permission of user is read at remote teaching end；
Step 3, remote teaching end verifying authorization；
Step 4, teaching resource is transmitted to remote teaching end by teaching controlling end after Authority Verification；
Step 5, teaching controlling end encrypts control instruction to obtain encrypted instruction and is transferred to remote teaching end；
Step 6, remote teaching end receives the encrypted instruction at teaching controlling end and is decrypted to obtain control instruction；
Step 7, remote teaching end is synchronized according to control instruction and remote teaching end.
Further, in step 1, the teaching controlling end includes smart mobile phone, tablet computer, desktop computer, pen
Remember this computer；The remote teaching end includes electronic whiteboard, projector, smart mobile phone, tablet computer, desktop computer, notes
This computer；The method of the connection is：The application at teaching controlling end is by WiFi, 4G/5G communication network one of which and at least
The application at one remote teaching end is communicated, such as the APP at teaching controlling end is applied, IOS is applied or windows application programs
Any one synchronizes using connection and communicates with the APP at remote teaching end applications, IOS.
Further, in step 2, the teaching resource includes document, hht coursewares, video, audio, picture, wherein
The file class of document includes ppt, word, excel, txt；The file class of video include mov, mp4, rmvb, avi, flv,
f4v,mpeg,swf；The file class of audio includes .mp3, m4a, oga, ogg, wav；The file class of picture include jpg,
jpeg、gif、bmp、PNG、Tif。
Further, in step 2, the permission includes administrator right, teacher's permission, student's permission, middle pipe
Reason person's permission can access and change teaching resource, change and authorize user right；Teacher's permission adds new teaching resource simultaneously
And it controlled, deleted for the new teaching resource of this role addition, edit operation；And it can be to the document in its teaching resource
It the operations such as annotated, scaled, being rotated, while supporting the pause of control video, broadcasting, playing progress rate, volume.It can lead to
The PPT that camera carries out at remote teaching end on real-time live broadcast, remote operation screen or computer desktop is crossed to play and terminate to play,
PPT on large-size screen monitors or computer is loaded into play mode on remote teaching end and carries out simultaneous display, passes through gesture identification（Including
Single give directions hits, double-clicks scaling, double-clicks idler wheel）It annotated, screenshotss, play PPT, play operations, each teachers such as blank and include
The permission of teaching of one or more students；Student's permission is to participate in course by way of display, broadcasting, download teaching resource,
Each student at least belongs to teaching in permission in teacher.Teaching controlling end logon rights are administrator right, Jiao Shiquan
Limit；Remote teaching end logon rights are administrator right, teacher's permission, student's permission.
Further, in step 3, the method for remote teaching end verifying authorization is to judge the use at remote teaching end
Family permission, then judging the permission in the student if it is student's permission, whether the affiliated teacher that logs in current control terminal teaches
It is not to refuse inspection of books if it is by verification in permission；If it is administrator right or teacher's permission then directly by testing
Card.
Further, in steps of 5, the control instruction is to be annotated, scaled to the document in teaching resource, rotated
Operational order；Or pause, broadcasting, playing progress rate, the volume instruction of control video；Or remote operation screen or computer desktop
On PPT play and terminate to play or gesture identification, including single give directions hits, double-clicks scaling, double-click idler wheel, is annotated, section
Screen plays PPT, plays blank operational order.
Further, in steps of 5, the encrypted cipher mode is SHA256 algorithm for encryption.
, the encrypted cipher mode is SHA256 algorithm for encryption.
/ * * SHA-256 Encryption Algorithm partial codes are as follows： */
static SHAStatusCode SHA224_256ResultN(SHA256Context *context,uint8_t
Message_Digest[ ], int HashSize)
{
int i;
if (!context) return shaNull;
if (!Message_Digest) return shaNull;
if (context->Corrupted) return context->Corrupted;
if (!context->Computed)
SHA224_256Finalize(context, 0x80);
for (i = 0; i < HashSize; ++i)
Message_Digest[i] = (uint8_t)(context->Intermediate_Hash[i>>2] >> 8 *
( 3 - ( i & 0x03 ) ));
return shaSuccess;
}。
Further, in step 6, the manner of decryption of the decryption is decrypted for SHA256 algorithms.
/ * * SHA-256 decipherment algorithm partial codes are as follows： */
private static byte[] GetLegalIV()
{
string sTemp = "swetwerehetyeryertyerty";
mobjCryptoService.GenerateIV();
byte[] bytTemp = mobjCryptoService.IV;
int IVLength = bytTemp.Length;
if (sTemp.Length > IVLength)
sTemp = sTemp.Substring(0, IVLength);
else if (sTemp.Length < IVLength)
sTemp = sTemp.PadRight(IVLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
public static string Encrypto(string Source)
{
byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
MemoryStream ms = new MemoryStream();
mobjCryptoService.Key = GetLegalKey();
mobjCryptoService.IV = GetLegalIV();
ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor
();
CryptoStream cs = new CryptoStream(ms, encrypto,
CryptoStreamMode.Write);
cs.Write(bytIn, 0, bytIn.Length);
cs.FlushFinalBlock();
ms.Close();
byte[] bytOut = ms.ToArray();
return Convert.ToBase64String(bytOut);
}
/// <param name="Source">String to be decrypted</param>
public static string Decrypto(string Source)
{
byte[] bytIn = Convert.FromBase64String(Source);
MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
mobjCryptoService.Key = GetLegalKey();
mobjCryptoService.IV = GetLegalIV();
ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor
();
CryptoStream cs = new CryptoStream(ms, encrypto,
CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cs);
return sr.ReadToEnd();
}
#endregion。
Further, in step 7, the remote teaching end synchronizes method according to control instruction and remote teaching end
Synchronous with the operation at remote teaching end for the operation at remote teaching end, the picture of both ends screen display is the same.
The present invention also provides a kind of remote interactive teaching devices of Mobile Teaching resource, as shown in Fig. 2, described device packet
It includes：
Connection unit is controlled, for teaching controlling end connection remote teaching end；
Permission reading unit reads the teaching resource and permission of user for remote teaching end；
Authority Verification unit is used for remote teaching end verifying authorization；
Resource transmission unit, for transmitting teaching resource to remote teaching end by teaching controlling end after Authority Verification；
Encryption unit is instructed, encrypts control instruction to obtain encrypted instruction for teaching controlling end and is transferred to remote teaching end；
Instruction decryption unit, receives the encrypted instruction at teaching controlling end and is decrypted to obtain control and refer to for remote teaching end
It enables；
Remote synchronization unit is synchronized for remote teaching end according to control instruction and remote teaching end.
A kind of remote interactive teaching device of the Mobile Teaching resource can run on desktop PC, notebook,
In the computing devices such as palm PC and cloud server.A kind of remote interactive teaching device of Mobile Teaching resource can be run
Device may include, but be not limited only to, processor, memory.It will be understood by those skilled in the art that the example is only one
The example of the remote interactive teaching device of kind Mobile Teaching resource does not constitute the remote interaction religion to a kind of Mobile Teaching resource
The restriction for learning device, may include component more more or fewer than example, either combine certain components or different components,
Such as a kind of remote interactive teaching device of Mobile Teaching resource can also be set including input-output equipment, network insertion
Standby, bus etc..Alleged processor can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), application-specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic device
Part, discrete hardware components etc..General processor can be microprocessor or the processor can also be any conventional processing
Device etc., the processor are a kind of control centres of the remote interactive teaching device running gear of Mobile Teaching resource, profit
With various interfaces and connection entirely a kind of remote interactive teaching device of Mobile Teaching resource can running gear each portion
Point.
The memory can be used for storing the computer program and/or module, and the processor is by running or executing
Computer program in the memory and/or module are stored, and calls the data being stored in memory, described in realization
A kind of various functions of the remote interactive teaching device of Mobile Teaching resource.The memory can mainly include storing program area and
Storage data field, wherein storing program area can storage program area, the application program needed at least one function（Such as sound
Playing function, image player function etc.）Deng；Storage data field can be stored uses created data according to mobile phone（Such as sound
Frequency evidence, phone directory etc.）Deng.In addition, memory may include high-speed random access memory, can also include non-volatile deposit
Reservoir, such as hard disk, memory, plug-in type hard disk, intelligent memory card（Smart Media Card, SMC）, secure digital
（Secure Digital, SD）Card, flash card（Flash Card）, at least one disk memory, flush memory device or its
His volatile solid-state part.
Although the description of the disclosure is quite detailed and especially several embodiments are described, it is not
Any of these details or embodiment or any specific embodiments are intended to be limited to, but it is by reference to appended that should be considered as
Claim considers that the prior art provides the possibility explanation of broad sense for these claims, to effectively cover the disclosure
Preset range.In addition, the disclosure is described with inventor's foreseeable embodiment above, its purpose is to be provided with
Description, and those equivalent modifications that the disclosure can be still represented to the unsubstantiality change of the disclosure still unforeseen at present.
Claims (8)
1. a kind of remote interactive teaching method of Mobile Teaching resource, which is characterized in that the described method comprises the following steps：
Step 1, teaching controlling end connection remote teaching end；
Step 2, the teaching resource and permission of user is read at remote teaching end；
Step 3, remote teaching end verifying authorization；
Step 4, teaching resource is transmitted to remote teaching end by teaching controlling end after Authority Verification；
Step 5, teaching controlling end encrypts control instruction to obtain encrypted instruction and is transferred to remote teaching end；
Step 6, remote teaching end receives the encrypted instruction at teaching controlling end and is decrypted to obtain control instruction；
Step 7, remote teaching end is synchronized according to control instruction and remote teaching end.
2. a kind of remote interactive teaching method of Mobile Teaching resource according to claim 1, which is characterized in that in step
In 1, the teaching controlling end includes smart mobile phone, tablet computer, desktop computer, laptop；The remote teaching
End includes electronic whiteboard, projector, smart mobile phone, tablet computer, desktop computer, laptop；The method of the connection is：
Teaching controlling end is communicated by WiFi, 4G/5G communication network one of which at least one remote teaching end.
3. a kind of remote interactive teaching method of Mobile Teaching resource according to claim 1, which is characterized in that in step
In 2, the teaching resource includes document, hht coursewares, video, audio, picture, the file class of wherein document include ppt,
word,excel,txt；The file class of video includes mov, mp4, rmvb, avi, flv, f4v, mpeg, swf；The file of audio
Classification includes .mp3, m4a, oga, ogg, wav；The file class of picture includes jpg, jpeg, gif, bmp, PNG, Tif.
4. a kind of remote interactive teaching method of Mobile Teaching resource according to claim 1, which is characterized in that in step
In 2, the permission includes administrator right, teacher's permission, student's permission.
5. a kind of remote interactive teaching method of Mobile Teaching resource according to claim 1, which is characterized in that in step
In 3, the method for remote teaching end verifying authorization is to judge the user right at remote teaching end, then if it is student's permission
Whether affiliated teacher's permission for judging in the student that logs in current control terminal teaches in permission, if it is by testing
Card, is not to refuse inspection of books；Then directly pass through verification if it is administrator right or teacher's permission.
6. a kind of remote interactive teaching method of Mobile Teaching resource according to claim 1, which is characterized in that in step
In 5, the control instruction is annotates the document in teaching resource, is scaled, rotation process instructs；Or control video is temporary
Stop, play, the instruction of playing progress rate, volume；Or the PPT on remote operation screen or computer desktop is played and is terminated to play,
Or gesture identification, including single give directions hit, double-click scaling, double-click idler wheel, is annotated, screenshotss, plays PPT, broadcasting blank operates
Instruction.
7. a kind of remote interactive teaching method of Mobile Teaching resource according to claim 1, which is characterized in that in step
In 5, the encrypted cipher mode is SHA256 algorithm for encryption.
8. a kind of remote interactive teaching device of Mobile Teaching resource, which is characterized in that described device includes：
Connection unit is controlled, for teaching controlling end connection remote teaching end；
Permission reading unit reads the teaching resource and permission of user for remote teaching end；
Authority Verification unit is used for remote teaching end verifying authorization；
Resource transmission unit, for transmitting teaching resource to remote teaching end by teaching controlling end after Authority Verification；
Encryption unit is instructed, encrypts control instruction to obtain encrypted instruction for teaching controlling end and is transferred to remote teaching end；
Instruction decryption unit, receives the encrypted instruction at teaching controlling end and is decrypted to obtain control and refer to for remote teaching end
It enables；
Remote synchronization unit is synchronized for remote teaching end according to control instruction and remote teaching end.
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|---|---|---|---|
| CN201810624283.5A CN108806376A (en) | 2018-06-16 | 2018-06-16 | A kind of remote interactive teaching method and device of Mobile Teaching resource |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111459637A (en) * | 2020-03-31 | 2020-07-28 | 漳州爱果冻信息科技有限公司 | Teaching resource control method and device and intelligent teaching system |
| CN111489599A (en) * | 2020-04-24 | 2020-08-04 | 水滴智慧科技(深圳)有限公司 | Multi-software compatible human-computer interaction teaching system |
| CN111540351A (en) * | 2020-04-08 | 2020-08-14 | 上海卓越睿新数码科技有限公司 | Method for controlling interactive live broadcast classroom by using voice instruction |
| CN112135156A (en) * | 2020-09-16 | 2020-12-25 | 广州华多网络科技有限公司 | Live broadcast method, education live broadcast method, system, equipment and storage medium |
| CN112383807A (en) * | 2021-01-11 | 2021-02-19 | 北京拓课网络科技有限公司 | Online education method and device and electronic equipment |
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