US20060036645A1 - System and method for automated data storage management - Google Patents
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- US20060036645A1 US20060036645A1 US10/915,993 US91599304A US2006036645A1 US 20060036645 A1 US20060036645 A1 US 20060036645A1 US 91599304 A US91599304 A US 91599304A US 2006036645 A1 US2006036645 A1 US 2006036645A1
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- the present invention relates generally to data storage management, and more specifically relates to a system and method for assigning management classes to data objects.
- management classes are used to define the criteria under which data elements will be administered. Namely, a defined management class will determine how an object will be managed over a period of time. For example, a management class may dictate that a given data object reside on DASD for x days, then be moved to a compressed format on DASD for y days, then be migrated to tape and stored for z days, and then be discarded.
- SANs storage area networks
- data may be distributed over a disparate network.
- disparate groups of users often commingle data, further complicating the process. Additional complications arise when one organization assumes responsibility for another organization's data.
- the present invention addresses the above-mentioned problems, as well as others, by providing a system and method for automatically assigning management classes to data objects.
- a management class processing system comprising: a class assignment system for assigning a management class to an inputted data object, wherein the class assignment system identifies historical usage characteristics of existing data objects that have attributes similar to the inputted data object; and a data analysis system that analyzes existing data objects to generate a knowledge base of historical usage data.
- the invention provides a program product stored on a recordable medium for processing management classes, comprising: program code for assigning a management class to an inputted data object by analyzing historical usage characteristics of existing data objects that have attributes similar to the inputted data object; and program code that analyzes existing data objects to generate a knowledge base of historical usage data.
- the invention provides a method for assigning management classes, comprising: analyzing existing data objects in a storage system to determine historical usage characteristics; inputting a new data object having at least one attribute; and assigning the new data object to a management class by analyzing historical usage characteristics of similarly attributed existing data objects.
- the invention provides a system for deploying an application for assigning management classes to data objects, comprising: a computer infrastructure being operable to: analyze existing data objects in a storage system to determine historical usage characteristics; input a new data object having at least one attribute; and assign the new data object to a management class by analyzing historical usage characteristics of similarly attributed existing data objects.
- the invention provides a computer software embodied in a propagated signal for assigning management classes to data objects, the computer software comprising instructions to cause a computer system to perform the following functions: analyze existing data objects in a storage system to determine historical usage characteristics; input a new data object having at least one attribute; and assign the new data object to a management class by analyzing historical usage characteristics of similarly attributed existing data objects.
- FIG. 1 depicts a management class processing system according to the present invention.
- FIG. 2 depicts a class assignment system of the system of FIG. 1 .
- FIG. 3 depicts a computer system for implementing the system of FIG. 1 .
- FIG. 1 depicts a management class processing system 12 that assigns a management class 24 to an inputted data object 10 .
- management class refers generically to any type of data storage criteria or scheme, and is not in any way limited to a particular programming construct.
- data object may refer to any type of data element or set of data elements.
- Class assignment system 14 determines a management class by analyzing attributes 11 of the inputted data object 10 in view of a knowledge base of historical usage characteristics 18 of existing data objects.
- existing data objects may refer to objects in any storage state, e.g., on DASD, compressed, on tape, deleted, etc.
- class assignment system 14 identifies usage characteristics of existing objects with similar attributes to that of inputted object 10 , and then analyzes the usage characteristics of the identified existing objects to select an appropriate class.
- object attributes 11 may include information such as name, data object type, size, creation information, source node information, etc., relating to object 10 .
- attributes of inputted data object 10 may include that the object was created at node X by application Y with a size Z.
- Historical usage characteristics 18 generally comprises usage information, i.e., how the existing data objects were used/managed over time, e.g., it was stored on DASD for x days, then compressed for y days, then moved to storage for z days, etc.
- class assignment system 14 would assign a management class to data object 10 . For instance, if class assignment system 14 found a historical record of data objects with similar name, attribute, creating node and application metadata, the class assignment system 14 would base the selection of the management class for data object 10 upon the actual usage traits of its predecessors. It should be understood that class assignment system 14 could utilize any logic for selecting management classes based on its analysis of the data object attributes 11 and historical usage characteristics 18 .
- Historical usage characteristics 18 may be stored in a knowledge base as metadata that is managed by a data management system 20 .
- Data management system 20 would for instance be responsible for storing, updating, grouping, searching, etc., historical usage characteristics 18 .
- Historical usage characteristics 18 could be extracted, collected, and/or processed (i.e., “analyzed”) from a storage system 26 by a data analysis system 22 .
- Storage system 26 represents a storage environment for any type of enterprise, system, or subsystem. Storage system 26 may include, e.g., hardware, software, an operating system, etc., necessary to manage data stored therein.
- data analysis system 22 would periodically gather usage information about the objects stored in storage system 26 .
- data analysis system 22 would obtain usage information whenever a triggering event (e.g., allocate, close, recall, etc.) was detected in the storage system 26 . This information would then be passed to data management system 20 , which would then be stored in the knowledge base of historical usage characteristics 18 . Thus, historical usage characteristics 18 can be collected for each existing data object in storage system 26 as the data object makes its way through the storage lifecycle. Thus, if an object gets recalled to DASD, goes to tape, gets compressed, gets deleted, etc., historical usage characteristics 18 get updated.
- a triggering event e.g., allocate, close, recall, etc.
- a data object 10 is assigned to a management class 24 , it can be stored in the storage system 26 such that its usage characteristics can eventually become part of the knowledge base of historical usage characteristics 18 .
- the knowledge base of historical usage characteristics 18 will grow, providing increased efficacy in assigning management classes to new data objects.
- usage characteristic information 18 could be initially populated with an initialization routine, and then be updated automatically any time a triggering event occurs.
- class assignment system 14 receives a data object 40 .
- Assignment logic 32 determines what attributes are known about data object 40 . In this case, it is known that data object 40 has a node of origin N1, a size 100, and a type xyz.
- Assignment logic 32 then instructs search system 36 to search the knowledge base of historical usage characteristics 18 ( FIG. 1 ) for similarly attributed data objects. Search system 36 could be incorporated into class assignment system 14 , or reside elsewhere within system 12 .
- a set of results 38 comprising matching (or near matching) attributes are identified and returned with their historical usage characteristics. Included for each data object is a set of usage history (e.g., last date of use, creation date, recall data, download node data, creator, etc.).
- assignment logic 32 After receiving the results 38 , assignment logic 32 applies a set of rules to the returned information and selects a management class 42 from the set of management classes 34 .
- class assignment system 14 could dynamically create a management class for the inputted data object 40 .
- assignment logic 32 may simply assign a default management class if no results 38 were found in the knowledge base. In the example shown in FIG. 2 , the first two existing data objects have the exact same node of origin and type, and a similar size, while the third existing data object has the same node of origin, and a similar type. Thus, assignment logic 32 would analyze the usage history of each of the existing objects and determine an appropriate management class 42 to be assigned to the inputted data object 40 . As noted above, any logic could be utilized to assign the management class based on the usage history of similarly attributed objects.
- Each of the possible management classes 34 has an associated storage scheme (i.e., schemes a, b and c) to be used for managing the data object to which it is assigned.
- a management class may dictate that the data object remain on DASD for six months, then be stored on DASD in a compressed form for two months, then be transferred to tape for one year, then be destroyed.
- SMF System Management Facilities
- DFSMShsm is a facility that automatically performs space management and availability management in a storage device hierarchy.
- DFSMShsm makes sure that space is available on a DASD volume so that one can extend old datasets & allocate new ones. DFSMShsm also makes sure that backup copies of datasets are always available in case working copies are lost or corrupted. Moreover, data could be analyzed from the data-using processes themselves, thus giving a rough idea regarding how frequently and in what manner the data object was created and used.
- Further features of the invention may include the ability to suggest a management class to the data object, the ability to override the class assignment system 14 , and the ability to build new management classes as needed.
- management class processing system 12 may be implemented as a program product on computer system 40 .
- computer system 40 may comprise, e.g., a desktop, a laptop, a workstation, etc.
- computer system 40 could be implemented as part of a client and/or a server.
- Computer system 40 generally includes a processing unit 44 , memory 42 , bus 50 , input/output (I/O) interfaces 46 , external devices/resources 48 and storage 52 .
- the processing unit 44 may comprise a single processing unit, or be distributed across one or more processing units in one or more locations, e.g., on a client and server.
- Memory 42 may comprise any known type of data storage and/or transmission media, including magnetic media, optical media, random access memory (RAM), read-only memory (ROM), a data cache, a data object, etc. Moreover, any memory 42 may reside at a single physical location, comprising one or more types of data storage, or be distributed across a plurality of physical systems in various forms.
- I/O interfaces 46 may comprise any system for exchanging information to/from an external resource.
- External devices/resources 48 may comprise any known type of external device, including speakers, a CRT, LED screen, hand-held device, keyboard, mouse, voice recognition system, speech output system, printer, monitor/display, facsimile, pager, etc.
- a bus 50 may be included to provide a communication link between each of the components in the computer system 40 and likewise may comprise any known type of transmission link, including electrical, optical, wireless, etc.
- additional components such as cache memory, communication systems, system software, etc., may be incorporated into computer system 40 .
- Storage system 26 and the knowledge base of historical usage characteristics 18 may be embodied in any type of storage 52 (e.g., a relational database, etc.) and may include one or more storage devices, such as RAM, ROM, a magnetic disk drive and/or an optical disk drive. Data storage can also be distributed across, for example, a local area network (LAN), wide area network (WAN) or a storage area network (SAN) (not shown). Thus, storage system 26 and/or knowledge base of historical usage characteristics 18 could have some or all of their data stored remotely over a distributed network, thereby allowing for the pooling of resources and information.
- LAN local area network
- WAN wide area network
- SAN storage area network
- Such a network 54 can be any type of network such as the Internet, a local area network (LAN), a wide area network (WAN), a virtual private network (VPN), etc. Communication could occur via a direct hardwired connection (e.g., serial port), or via an addressable connection that may utilize any combination of wireline and/or wireless transmission methods. Moreover, conventional network connectivity, such as Token Ring, Ethernet, WiFi or other conventional communications standards could be used. Still yet, connectivity could be provided by conventional TCP/IP sockets-based protocol. In this instance, an Internet service provider could be used to establish interconnectivity. Further, as indicated above, communication could occur in a client-server or server-server environment.
- LAN local area network
- WAN wide area network
- VPN virtual private network
- a computer system 40 comprising management class processing system 12 could be created, maintained and/or deployed by a service provider that offers the functions described herein for customers. That is, a service provider could off the service of generating management classes, e.g., as an application service provider.
- the present invention can be realized in hardware, software, a propagated signal, or any combination thereof. Any kind of computer/server system(s)—or other apparatus adapted for carrying out the methods described herein—is suited.
- a typical combination of hardware and software could be a general purpose computer system with a computer program that, when loaded and executed, carries out the respective methods described herein.
- a specific use computer containing specialized hardware for carrying out one or more of the functional tasks of the invention, could be utilized.
- the present invention can also be embedded in a computer program product or a propagated signal, which comprises all the respective features enabling the implementation of the methods described herein, and which—when loaded in a computer system—is able to carry out these methods.
- Computer program, propagated signal, software program, program, or software in the present context mean any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: (a) conversion to another language, code or notation; and/or (b) reproduction in a different material form.
Abstract
Description
- The present invention relates generally to data storage management, and more specifically relates to a system and method for assigning management classes to data objects.
- In today's large scale storage systems, a tremendous amount of effort can be expended in assigning management criteria to individual or groups of data objects. In many modern operating systems, such as OS/390 and z/OS, “management classes” are used to define the criteria under which data elements will be administered. Namely, a defined management class will determine how an object will be managed over a period of time. For example, a management class may dictate that a given data object reside on DASD for x days, then be moved to a compressed format on DASD for y days, then be migrated to tape and stored for z days, and then be discarded.
- Unfortunately, the process of assigning management classes is often done by a storage administrator who has to make various assumptions about the data. Often, however, the storage administrator is well removed from the application side of the environment that generated or utilizes the data. To address this, prescribed policies and procedures are often put into place for application implementers. Unfortunately, such procedures are often not followed or completely understood, thanks to a lack of training, oversight, etc. Moreover, once a storage management criteria is assigned to a group of objects, the criteria often does not remain up to date with the application requirements.
- Such problems are further exacerbated by the use of storage area networks (SANs), in which data may be distributed over a disparate network. In such cases, it is not feasible for a storage administrator to know how a given set of data should be managed. Furthermore, in such scenarios, disparate groups of users often commingle data, further complicating the process. Additional complications arise when one organization assumes responsibility for another organization's data.
- Accordingly, a need exists for a system and method that can effectively assign management classes to data objects in an automated manner.
- The present invention addresses the above-mentioned problems, as well as others, by providing a system and method for automatically assigning management classes to data objects. In a first aspect, the invention provides a management class processing system, comprising: a class assignment system for assigning a management class to an inputted data object, wherein the class assignment system identifies historical usage characteristics of existing data objects that have attributes similar to the inputted data object; and a data analysis system that analyzes existing data objects to generate a knowledge base of historical usage data.
- In a second aspect, the invention provides a program product stored on a recordable medium for processing management classes, comprising: program code for assigning a management class to an inputted data object by analyzing historical usage characteristics of existing data objects that have attributes similar to the inputted data object; and program code that analyzes existing data objects to generate a knowledge base of historical usage data.
- In a third aspect, the invention provides a method for assigning management classes, comprising: analyzing existing data objects in a storage system to determine historical usage characteristics; inputting a new data object having at least one attribute; and assigning the new data object to a management class by analyzing historical usage characteristics of similarly attributed existing data objects.
- In a fourth aspect, the invention provides a system for deploying an application for assigning management classes to data objects, comprising: a computer infrastructure being operable to: analyze existing data objects in a storage system to determine historical usage characteristics; input a new data object having at least one attribute; and assign the new data object to a management class by analyzing historical usage characteristics of similarly attributed existing data objects.
- In a fifth aspect, the invention provides a computer software embodied in a propagated signal for assigning management classes to data objects, the computer software comprising instructions to cause a computer system to perform the following functions: analyze existing data objects in a storage system to determine historical usage characteristics; input a new data object having at least one attribute; and assign the new data object to a management class by analyzing historical usage characteristics of similarly attributed existing data objects.
- These and other features of this invention will be more readily understood from the following detailed description of the various aspects of the invention taken in conjunction with the accompanying drawings in which:
-
FIG. 1 depicts a management class processing system according to the present invention. -
FIG. 2 depicts a class assignment system of the system ofFIG. 1 . -
FIG. 3 depicts a computer system for implementing the system ofFIG. 1 . - The drawings are not necessarily to scale. The drawings are merely schematic representations, not intended to portray specific parameters of the invention. The drawings are intended to depict only typical embodiments of the invention, and therefore should not be considered as limiting the scope of the invention. In the drawings, like numbering represents like elements.
- Referring now to the drawings,
FIG. 1 depicts a managementclass processing system 12 that assigns amanagement class 24 to an inputteddata object 10. It should be understood that the term “management class” refers generically to any type of data storage criteria or scheme, and is not in any way limited to a particular programming construct. Similarly, the term “data object” may refer to any type of data element or set of data elements.Class assignment system 14 determines a management class by analyzingattributes 11 of the inputteddata object 10 in view of a knowledge base of historical usage characteristics 18 of existing data objects. For the purposes of this disclosure, the term “existing” data objects may refer to objects in any storage state, e.g., on DASD, compressed, on tape, deleted, etc. To determine amanagement class 24,class assignment system 14 identifies usage characteristics of existing objects with similar attributes to that of inputtedobject 10, and then analyzes the usage characteristics of the identified existing objects to select an appropriate class. - In one illustrative embodiment,
object attributes 11 may include information such as name, data object type, size, creation information, source node information, etc., relating toobject 10. Thus, attributes of inputteddata object 10 may include that the object was created at node X by application Y with a size Z. Historical usage characteristics 18 generally comprises usage information, i.e., how the existing data objects were used/managed over time, e.g., it was stored on DASD for x days, then compressed for y days, then moved to storage for z days, etc. - Then, based on a set or rules or logic,
class assignment system 14 would assign a management class todata object 10. For instance, ifclass assignment system 14 found a historical record of data objects with similar name, attribute, creating node and application metadata, theclass assignment system 14 would base the selection of the management class fordata object 10 upon the actual usage traits of its predecessors. It should be understood thatclass assignment system 14 could utilize any logic for selecting management classes based on its analysis of thedata object attributes 11 and historical usage characteristics 18. - Historical usage characteristics 18 may be stored in a knowledge base as metadata that is managed by a
data management system 20.Data management system 20 would for instance be responsible for storing, updating, grouping, searching, etc., historical usage characteristics 18. Historical usage characteristics 18 could be extracted, collected, and/or processed (i.e., “analyzed”) from astorage system 26 by adata analysis system 22.Storage system 26 represents a storage environment for any type of enterprise, system, or subsystem.Storage system 26 may include, e.g., hardware, software, an operating system, etc., necessary to manage data stored therein. In one illustrative embodiment,data analysis system 22 would periodically gather usage information about the objects stored instorage system 26. Alternatively,data analysis system 22 would obtain usage information whenever a triggering event (e.g., allocate, close, recall, etc.) was detected in thestorage system 26. This information would then be passed todata management system 20, which would then be stored in the knowledge base of historical usage characteristics 18. Thus, historical usage characteristics 18 can be collected for each existing data object instorage system 26 as the data object makes its way through the storage lifecycle. Thus, if an object gets recalled to DASD, goes to tape, gets compressed, gets deleted, etc., historical usage characteristics 18 get updated. - Moreover, after a
data object 10 is assigned to amanagement class 24, it can be stored in thestorage system 26 such that its usage characteristics can eventually become part of the knowledge base of historical usage characteristics 18. Thus, as more and more data objects are added tostorage system 26, the knowledge base of historical usage characteristics 18 will grow, providing increased efficacy in assigning management classes to new data objects. - It should be recognized that any or all of the various functions described herein could be integrated within the facilities of the
storage system 26. Such facilities, which perform any pertinent data management functions, e.g., allocate, close, recall, delete, migrate, etc., may trigger the appropriate update to usage characteristic information 18. Thus, usage characteristic information 18 could be initially populated with an initialization routine, and then be updated automatically any time a triggering event occurs. - Referring now to
FIG. 2 , an illustrative embodiment of aclass assignment system 14 is shown. In this example,class assignment system 14 receives adata object 40.Assignment logic 32 then determines what attributes are known aboutdata object 40. In this case, it is known thatdata object 40 has a node of origin N1, a size 100, and a type xyz.Assignment logic 32 then instructssearch system 36 to search the knowledge base of historical usage characteristics 18 (FIG. 1 ) for similarly attributed data objects.Search system 36 could be incorporated intoclass assignment system 14, or reside elsewhere withinsystem 12. In this example, a set ofresults 38 comprising matching (or near matching) attributes are identified and returned with their historical usage characteristics. Included for each data object is a set of usage history (e.g., last date of use, creation date, recall data, download node data, creator, etc.). - After receiving the
results 38,assignment logic 32 applies a set of rules to the returned information and selects amanagement class 42 from the set ofmanagement classes 34. Alternatively,class assignment system 14 could dynamically create a management class for the inputteddata object 40. Moreover, in some instances,assignment logic 32 may simply assign a default management class if noresults 38 were found in the knowledge base. In the example shown inFIG. 2 , the first two existing data objects have the exact same node of origin and type, and a similar size, while the third existing data object has the same node of origin, and a similar type. Thus,assignment logic 32 would analyze the usage history of each of the existing objects and determine anappropriate management class 42 to be assigned to the inputteddata object 40. As noted above, any logic could be utilized to assign the management class based on the usage history of similarly attributed objects. - Each of the
possible management classes 34 has an associated storage scheme (i.e., schemes a, b and c) to be used for managing the data object to which it is assigned. For example, a management class may dictate that the data object remain on DASD for six months, then be stored on DASD in a compressed form for two months, then be transferred to tape for one year, then be destroyed. - In further illustrative embodiments involving for instance involving OS/390 or z/OS operating systems, data could be analyzed from System Management Facilities (SMF), which would provide a complete historical view regarding how data objects were used in the past. SMF collects and records system and job-related information that an installation can use for, e.g., billing users, reporting reliability, analyzing configurations, scheduling jobs, summarizing direct access volume activity, evaluating dataset activity, profiling system resource use, maintaining system security, etc. Data could also be analyzed from DFSMShsm, which would provide details of instances where data was recalled back from another medium, potentially signaling an anomaly in the current management class. DFSMShsm is a facility that automatically performs space management and availability management in a storage device hierarchy. DFSMShsm makes sure that space is available on a DASD volume so that one can extend old datasets & allocate new ones. DFSMShsm also makes sure that backup copies of datasets are always available in case working copies are lost or corrupted. Moreover, data could be analyzed from the data-using processes themselves, thus giving a rough idea regarding how frequently and in what manner the data object was created and used.
- Further features of the invention may include the ability to suggest a management class to the data object, the ability to override the
class assignment system 14, and the ability to build new management classes as needed. - Referring to
FIG. 3 , it is noted that managementclass processing system 12 may be implemented as a program product oncomputer system 40. In general,computer system 40 may comprise, e.g., a desktop, a laptop, a workstation, etc. Moreover,computer system 40 could be implemented as part of a client and/or a server.Computer system 40 generally includes aprocessing unit 44,memory 42,bus 50, input/output (I/O) interfaces 46, external devices/resources 48 andstorage 52. Theprocessing unit 44 may comprise a single processing unit, or be distributed across one or more processing units in one or more locations, e.g., on a client and server.Memory 42 may comprise any known type of data storage and/or transmission media, including magnetic media, optical media, random access memory (RAM), read-only memory (ROM), a data cache, a data object, etc. Moreover, anymemory 42 may reside at a single physical location, comprising one or more types of data storage, or be distributed across a plurality of physical systems in various forms. - I/O interfaces 46 may comprise any system for exchanging information to/from an external resource. External devices/
resources 48 may comprise any known type of external device, including speakers, a CRT, LED screen, hand-held device, keyboard, mouse, voice recognition system, speech output system, printer, monitor/display, facsimile, pager, etc. Abus 50 may be included to provide a communication link between each of the components in thecomputer system 40 and likewise may comprise any known type of transmission link, including electrical, optical, wireless, etc. Although not shown, additional components, such as cache memory, communication systems, system software, etc., may be incorporated intocomputer system 40. -
Storage system 26 and the knowledge base of historical usage characteristics 18 may be embodied in any type of storage 52 (e.g., a relational database, etc.) and may include one or more storage devices, such as RAM, ROM, a magnetic disk drive and/or an optical disk drive. Data storage can also be distributed across, for example, a local area network (LAN), wide area network (WAN) or a storage area network (SAN) (not shown). Thus,storage system 26 and/or knowledge base of historical usage characteristics 18 could have some or all of their data stored remotely over a distributed network, thereby allowing for the pooling of resources and information. - Such a
network 54 can be any type of network such as the Internet, a local area network (LAN), a wide area network (WAN), a virtual private network (VPN), etc. Communication could occur via a direct hardwired connection (e.g., serial port), or via an addressable connection that may utilize any combination of wireline and/or wireless transmission methods. Moreover, conventional network connectivity, such as Token Ring, Ethernet, WiFi or other conventional communications standards could be used. Still yet, connectivity could be provided by conventional TCP/IP sockets-based protocol. In this instance, an Internet service provider could be used to establish interconnectivity. Further, as indicated above, communication could occur in a client-server or server-server environment. - It should be appreciated that the teachings of the present invention could be offered as a business method on a subscription or fee basis. For example, a
computer system 40 comprising managementclass processing system 12 could be created, maintained and/or deployed by a service provider that offers the functions described herein for customers. That is, a service provider could off the service of generating management classes, e.g., as an application service provider. - It should also be understood that the present invention can be realized in hardware, software, a propagated signal, or any combination thereof. Any kind of computer/server system(s)—or other apparatus adapted for carrying out the methods described herein—is suited. A typical combination of hardware and software could be a general purpose computer system with a computer program that, when loaded and executed, carries out the respective methods described herein. Alternatively, a specific use computer, containing specialized hardware for carrying out one or more of the functional tasks of the invention, could be utilized. The present invention can also be embedded in a computer program product or a propagated signal, which comprises all the respective features enabling the implementation of the methods described herein, and which—when loaded in a computer system—is able to carry out these methods. Computer program, propagated signal, software program, program, or software, in the present context mean any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: (a) conversion to another language, code or notation; and/or (b) reproduction in a different material form.
- The foregoing description of the preferred embodiments of this invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously, many modifications and variations are possible. Such modifications and variations that may be apparent to a person skilled in the art are intended to be included within the scope of this invention as defined by the accompanying claims.
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CN (1) | CN100397395C (en) |
SG (1) | SG120256A1 (en) |
TW (1) | TW200627204A (en) |
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CN111260512A (en) * | 2020-01-09 | 2020-06-09 | 湖北美和易思教育科技有限公司 | Background course autonomous distribution method and device |
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Also Published As
Publication number | Publication date |
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TW200627204A (en) | 2006-08-01 |
CN1734451A (en) | 2006-02-15 |
US20070299879A1 (en) | 2007-12-27 |
SG120256A1 (en) | 2006-03-28 |
CN100397395C (en) | 2008-06-25 |
US8332364B2 (en) | 2012-12-11 |
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