CN113242636A - Night light and control method thereof - Google Patents
Night light and control method thereof Download PDFInfo
- Publication number
- CN113242636A CN113242636A CN202110476097.3A CN202110476097A CN113242636A CN 113242636 A CN113242636 A CN 113242636A CN 202110476097 A CN202110476097 A CN 202110476097A CN 113242636 A CN113242636 A CN 113242636A
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- light
- control module
- lamp ball
- ball seat
- electromagnet
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000009471 action Effects 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 4
- 238000013475 authorization Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 230000007958 sleep Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
- F21V21/36—Hoisting or lowering devices, e.g. for maintenance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
- F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
- F21V23/0464—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors the sensor sensing the level of ambient illumination, e.g. dawn or dusk sensors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/19—Controlling the light source by remote control via wireless transmission
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to the technical field of intelligent control, in particular to a night light and a control method thereof, wherein the method comprises the following steps: the control module acquires indoor light intensity detected by the light sensor, determines whether the indoor light intensity is lower than a light threshold value, and if so, controls the luminous body to emit light and increases the power supply electric quantity of the battery pack so as to enhance the magnetic force of the electromagnet, so that the magnetic force of the electromagnet and the permanent magnet is repelled, and the lamp ball seat is driven to ascend through the permanent magnet; if not, reducing the power supply quantity of the battery pack to reduce the magnetic force of the electromagnet, so that the lamp ball seat descends to the base under the action of gravity; the control module and the battery pack are arranged at the bottom of the base, and the electromagnet is arranged at the top of the base; the permanent magnet is fixedly arranged at the bottom of the lamp ball seat, the light-transmitting lamp ball is arranged at the top of the lamp ball seat, the light sensor and the luminous body are arranged inside the light-transmitting lamp ball, and the base is connected with the lamp ball seat through a connecting wire.
Description
Technical Field
The invention relates to the technical field of intelligent control, in particular to a night light and a control method thereof.
Background
The existing night light needs to be manually adjusted to be switched on and off when a user sleeps, most of the prior art night lights are provided with a switching lighting function, the interaction mode is single, autonomous interaction with the user cannot be generated, and romantic experience conforming to the dream cannot be created; a good sleep experience cannot be provided.
Therefore, it is desirable to provide an intelligently controlled night light, which can automatically adjust the switch of the night light to generate autonomous interaction with the user.
Disclosure of Invention
The present invention is directed to a night light and a control method thereof, which solves one or more of the problems of the prior art and provides at least one of the advantages of the present invention.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of controlling a night light, the method comprising the steps of:
s100, a control module acquires indoor light intensity detected by a light sensor;
step S200, the control module determines whether the indoor light intensity is lower than a light threshold, if so, step S300 is executed, and if not, step S400 is executed;
step S300, the control module controls the luminous body to emit light and increases the power supply electric quantity of the battery pack so as to enhance the magnetic force of the electromagnet, so that the magnetic force of the electromagnet and the permanent magnet repel each other, and the lamp ball seat is driven to rise through the permanent magnet;
s400, the control module controls the light-emitting body to extinguish and reduces the power supply capacity of the battery pack so as to reduce the magnetic force of the electromagnet and enable the lamp ball seat to descend to the base under the action of gravity;
the control module and the battery pack are arranged at the bottom of the interior of the base, and the electromagnet is arranged at the top of the interior of the base; the permanent magnet is fixedly arranged at the bottom of the lamp ball seat, a light-transmitting lamp ball is arranged at the top of the lamp ball seat, a light sensor and a luminous body are arranged inside the light-transmitting lamp ball, and the base is connected with the lamp ball seat through a connecting wire.
Further, the step S300 further includes:
step S311, after the lamp ball seat rises, a control module acquires an external force detected by a touch sensor, wherein the touch sensor is arranged on the surface of the light-transmitting lamp ball;
step S312, when the control module determines that the external force intensity detected by the touch sensor changes for the first time, controlling the luminous tone of the luminous body to be changed into cold color;
step 313, when the control module determines again that the external force intensity detected by the touch sensor changes, determining whether the duration time of the external force reaches a time threshold; if yes, go to step S314, otherwise go to step S315;
step S314, controlling the luminance of the luminous body to change step by step;
step S315, the color tone of the light emitted by the light emitting body is controlled to alternate between the cold color and the warm color once, and the process goes to step S313.
Further, the step S300 further includes:
step S321, after the lamp ball seat rises, the control module establishes communication connection with the intelligent terminal through the Bluetooth module;
step S322, after the control module carries out playing authorization on the intelligent terminal, audio data played by the intelligent terminal are obtained;
step S323, controlling the sound to play the audio data in real time until the lamp ball seat descends to the base under the action of gravity or the control module stops acquiring the audio data, wherein the Bluetooth module and the sound are arranged inside the base, and the Bluetooth module and the sound are respectively connected with the control module.
A computer-readable storage medium, on which a control program of a night light is stored, which, when executed by a processor, implements the steps of the method of controlling a night light as set forth in any one of the above.
A night light, the night light comprising:
the control module and the battery pack are arranged at the bottom of the inside of the base, and the electromagnet is arranged at the top of the inside of the base;
the lamp ball seat is fixedly provided with a permanent magnet at the bottom, a light-transmitting lamp ball is arranged at the top of the lamp ball seat, a light-emitting body, a light sensor and a touch sensor are arranged in the light-transmitting lamp ball, and the permanent magnet is opposite to the electromagnet;
the connecting wire is used for connecting the base and the lamp ball seat, and a through hole for the lead to pass through is formed in the connecting wire;
the control module is respectively connected with the electromagnet, the light sensor, the touch sensor and the luminous body through leads; wires among the control module, the light sensor, the touch sensor and the light emitter penetrate through the connecting wire;
the control module includes:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is caused to implement the method for controlling a night light according to any one of the above.
The invention has the beneficial effects that: the invention discloses a night light and a control method thereof.A control module is used for acquiring indoor light intensity detected by a light sensor and adjusting the power supply electric quantity of a battery pack according to the indoor light intensity so as to change the magnetic force of an electromagnet and enable a light ball seat to ascend or descend; the night light disclosed by the invention can actively create a good interaction effect according to the control effect of automatic lifting of light by intelligently controlling and automatically adjusting the switch of the night light.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for controlling a night light according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a night light in an embodiment of the present invention;
fig. 3 is a circuit block diagram of the night light in the embodiment of the present invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for controlling a night light provided by the present invention, the method includes the following steps:
s100, a control module acquires indoor light intensity detected by a light sensor;
step S200, the control module determines whether the indoor light intensity is lower than a light threshold, if so, step S300 is executed, and if not, step S400 is executed;
step S300, the control module controls the luminous body to emit light and increases the power supply electric quantity of the battery pack so as to enhance the magnetic force of the electromagnet, so that the magnetic force of the electromagnet and the permanent magnet repel each other, and the lamp ball seat is driven to rise through the permanent magnet;
s400, the control module controls the light-emitting body to extinguish and reduces the power supply capacity of the battery pack so as to reduce the magnetic force of the electromagnet and enable the lamp ball seat to descend to the base under the action of gravity;
the control module and the battery pack are arranged at the bottom of the interior of the base, and the electromagnet is arranged at the top of the interior of the base; the permanent magnet is fixedly arranged at the bottom of the lamp ball seat, a light-transmitting lamp ball is arranged at the top of the lamp ball seat, a light sensor and a luminous body are arranged inside the light-transmitting lamp ball, and the base is connected with the lamp ball seat through a connecting wire.
As a further improvement of the above embodiment, the step S300 further includes:
step S311, after the lamp ball seat rises, a control module acquires an external force detected by a touch sensor, wherein the touch sensor is arranged on the surface of the light-transmitting lamp ball;
step S312, when the control module determines that the external force intensity detected by the touch sensor changes for the first time, controlling the luminous tone of the luminous body to be changed into cold color;
step 313, when the control module determines again that the external force intensity detected by the touch sensor changes, determining whether the duration time of the external force reaches a time threshold; if yes, go to step S314, otherwise go to step S315;
step S314, controlling the luminance of the luminous body to change step by step;
step S315, the color tone of the light emitted by the light emitting body is controlled to alternate between the cold color and the warm color once, and the process goes to step S313.
In some embodiments, when the silica gel lamp ball is tapped for the first time, the touch sensor triggers the control module to work, and the control module controls the color tone of the light emitted by the light emitting body to be changed into cold color; the silica gel lamp ball is tapped once again, and the control module controls the color tone of the luminous body to be changed into warm color; when the duration of pressing the transparent lamp ball reaches a time threshold value, the luminous body gradually changes the color brightness.
As a further improvement of the above embodiment, the step S300 further includes:
step S321, after the lamp ball seat rises, the control module establishes communication connection with the intelligent terminal through the Bluetooth module;
step S322, after the control module carries out playing authorization on the intelligent terminal, audio data played by the intelligent terminal are obtained;
step S323, controlling the sound to play the audio data in real time until the lamp ball seat descends to the base under the action of gravity or the control module stops acquiring the audio data, wherein the Bluetooth module and the sound are arranged inside the base, and the Bluetooth module and the sound are respectively connected with the control module.
Corresponding to the method in fig. 1, an embodiment of the present invention further provides a computer-readable storage medium, where a control program of a night light is stored on the computer-readable storage medium, and when the control program of the night light is executed by a processor, the steps of the method for controlling a night light according to any of the above embodiments are implemented.
Corresponding to the method of fig. 1, referring to fig. 2, fig. 2 is a schematic structural diagram of a night light provided by the present invention, where the night light includes:
the base 10, a control module 100, a battery pack 110 and an electromagnet 200 are arranged inside the base 10, the control module 100 and the battery pack 110 are arranged at the bottom inside the base 10, and the electromagnet 200 is arranged at the top inside the base 10;
the light ball seat 20 is provided with a permanent magnet at the bottom of the light ball seat 20, a light-transmitting light ball is arranged at the top of the light ball seat 20, a light-emitting body 700, a light sensor 500 and a touch sensor 00 are arranged in the light-transmitting light ball, and the permanent magnet is arranged opposite to the electromagnet 200;
a connecting wire 30 for connecting the base 10 and the lamp ball socket 20, wherein the inside of the connecting wire is a through hole for a lead to pass through;
referring to fig. 3, the control module 100 is respectively connected to the electromagnet 200, the light sensor 500, the touch sensor 00 and the light emitter 700 through wires; wires between the control module 100 and the light sensor 500, the touch sensor 00 and the light emitter 700 pass through the inside of the connecting wire 30;
the control module 100 includes:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is enabled to implement the method for controlling a night light according to any of the above embodiments.
The contents in the above method embodiments are all applicable to the present system embodiment, the functions specifically implemented by the present system embodiment are the same as those in the above method embodiment, and the beneficial effects achieved by the present system embodiment are also the same as those achieved by the above method embodiment.
The Processor may be a Central-Processing Unit (CPU), other general-purpose Processor, a Digital Signal Processor (DSP), an Application-Specific-Integrated-Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, said processor being the control centre of the control system of the night light, the various interfaces and lines connecting the various parts of the whole night light control system operational arrangement.
The memory may be used to store the computer program and/or module, and the processor may implement various functions of the control system of the night light by running or executing the computer program and/or module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart-Media-Card (SMC), a Secure-Digital (SD) Card, a Flash-memory Card (Flash-Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
While the present invention has been described in considerable detail and with particular reference to a few illustrative embodiments thereof, it is not intended to be limited to any such details or embodiments or any particular embodiments, but rather it is to be construed that the invention effectively covers the intended scope of the invention by virtue of the prior art providing a broad interpretation of such claims in view of the appended claims. Furthermore, the foregoing describes the invention in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the invention, not presently foreseen, may nonetheless represent equivalent modifications thereto.
Claims (5)
1. A method for controlling a night light, the method comprising the steps of:
s100, a control module acquires indoor light intensity detected by a light sensor;
step S200, the control module determines whether the indoor light intensity is lower than a light threshold, if so, step S300 is executed, and if not, step S400 is executed;
step S300, the control module controls the luminous body to emit light and increases the power supply electric quantity of the battery pack so as to enhance the magnetic force of the electromagnet, so that the magnetic force of the electromagnet and the permanent magnet repel each other, and the lamp ball seat is driven to rise through the permanent magnet;
s400, the control module controls the light-emitting body to extinguish and reduces the power supply capacity of the battery pack so as to reduce the magnetic force of the electromagnet and enable the lamp ball seat to descend to the base under the action of gravity;
the control module and the battery pack are arranged at the bottom of the interior of the base, and the electromagnet is arranged at the top of the interior of the base; the permanent magnet is fixedly arranged at the bottom of the lamp ball seat, a light-transmitting lamp ball is arranged at the top of the lamp ball seat, a light sensor and a luminous body are arranged inside the light-transmitting lamp ball, and the base is connected with the lamp ball seat through a connecting wire.
2. The method as claimed in claim 1, wherein the step S300 further comprises:
step S311, after the lamp ball seat rises, a control module acquires an external force detected by a touch sensor, wherein the touch sensor is arranged on the surface of the light-transmitting lamp ball;
step S312, when the control module determines that the external force intensity detected by the touch sensor changes for the first time, controlling the luminous tone of the luminous body to be changed into cold color;
step 313, when the control module determines again that the external force intensity detected by the touch sensor changes, determining whether the duration time of the external force reaches a time threshold; if yes, go to step S314, otherwise go to step S315;
step S314, controlling the luminance of the luminous body to change step by step;
step S315, the color tone of the light emitted by the light emitting body is controlled to alternate between the cold color and the warm color once, and the process goes to step S313.
3. The method as claimed in claim 2, wherein the step S300 further comprises:
step S321, after the lamp ball seat rises, the control module establishes communication connection with the intelligent terminal through the Bluetooth module;
step S322, after the control module carries out playing authorization on the intelligent terminal, audio data played by the intelligent terminal are obtained;
step S323, controlling the sound to play the audio data in real time until the lamp ball seat descends to the base under the action of gravity or the control module stops acquiring the audio data, wherein the Bluetooth module and the sound are arranged inside the base, and the Bluetooth module and the sound are respectively connected with the control module.
4. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a control program of a night light, which when executed by a processor implements the steps of the method of controlling a night light according to any one of claims 1 to 3.
5. A night light, comprising:
the control module and the battery pack are arranged at the bottom of the inside of the base, and the electromagnet is arranged at the top of the inside of the base;
the lamp ball seat is fixedly provided with a permanent magnet at the bottom, a light-transmitting lamp ball is arranged at the top of the lamp ball seat, a light-emitting body, a light sensor and a touch sensor are arranged in the light-transmitting lamp ball, and the permanent magnet is opposite to the electromagnet;
the connecting wire is used for connecting the base and the lamp ball seat, and a through hole for the lead to pass through is formed in the connecting wire;
the control module is respectively connected with the electromagnet, the light sensor, the touch sensor and the luminous body through leads; wires among the control module, the light sensor, the touch sensor and the light emitter penetrate through the connecting wire;
the control module includes:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, cause the at least one processor to implement the method for controlling a night-light according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110476097.3A CN113242636B (en) | 2021-04-29 | 2021-04-29 | Night light and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110476097.3A CN113242636B (en) | 2021-04-29 | 2021-04-29 | Night light and control method thereof |
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| Publication Number | Publication Date |
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| CN113242636A true CN113242636A (en) | 2021-08-10 |
| CN113242636B CN113242636B (en) | 2022-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110476097.3A Active CN113242636B (en) | 2021-04-29 | 2021-04-29 | Night light and control method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104315442A (en) * | 2014-11-13 | 2015-01-28 | 林锋 | LED sound control lamp |
| CN205909027U (en) * | 2016-07-28 | 2017-01-25 | 宁波工程学院 | Intelligence magnetic suspension music lamp |
| CN206018462U (en) * | 2016-09-19 | 2017-03-15 | 厦门市飞曜信息技术有限公司 | A kind of LED night lamp |
| CN107172745A (en) * | 2017-06-05 | 2017-09-15 | 广州视源电子科技股份有限公司 | Color temperature automatic adjusting method and device and lamp mirror |
-
2021
- 2021-04-29 CN CN202110476097.3A patent/CN113242636B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104315442A (en) * | 2014-11-13 | 2015-01-28 | 林锋 | LED sound control lamp |
| CN205909027U (en) * | 2016-07-28 | 2017-01-25 | 宁波工程学院 | Intelligence magnetic suspension music lamp |
| CN206018462U (en) * | 2016-09-19 | 2017-03-15 | 厦门市飞曜信息技术有限公司 | A kind of LED night lamp |
| CN107172745A (en) * | 2017-06-05 | 2017-09-15 | 广州视源电子科技股份有限公司 | Color temperature automatic adjusting method and device and lamp mirror |
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| Publication number | Publication date |
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| CN113242636B (en) | 2022-06-17 |
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Effective date of registration: 20240528 Address after: Room 302-97, Building 1, No. 1963 Huaguan Road, Tianhe District, Guangzhou City, Guangdong Province, 510630 Patentee after: Guangzhou Yanguang Institute Lighting Design Co.,Ltd. Country or region after: China Address before: 528041 Guangdong city of Foshan province Chancheng Lanshi Stone Road No. 20 Patentee before: GUANGDONG VOCATIONAL AND TECHNICAL College Country or region before: China |