CN106681888A - Mobile equipment screen protection device and method - Google Patents
Mobile equipment screen protection device and method Download PDFInfo
- Publication number
- CN106681888A CN106681888A CN201611076790.7A CN201611076790A CN106681888A CN 106681888 A CN106681888 A CN 106681888A CN 201611076790 A CN201611076790 A CN 201611076790A CN 106681888 A CN106681888 A CN 106681888A
- Authority
- CN
- China
- Prior art keywords
- pressure
- controller
- brightness
- detection unit
- screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 44
- 230000001681 protective effect Effects 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 10
- 239000003086 colorant Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- 201000004569 Blindness Diseases 0.000 description 1
- 208000020564 Eye injury Diseases 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/32—Monitoring with visual or acoustical indication of the functioning of the machine
- G06F11/324—Display of status information
- G06F11/327—Alarm or error message display
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3265—Power saving in display device
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/3058—Monitoring arrangements for monitoring environmental properties or parameters of the computing system or of the computing system component, e.g. monitoring of power, currents, temperature, humidity, position, vibrations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/32—Monitoring with visual or acoustical indication of the functioning of the machine
- G06F11/324—Display of status information
- G06F11/325—Display of status information by lamps or LED's
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Quality & Reliability (AREA)
- Computing Systems (AREA)
- Telephone Function (AREA)
Abstract
The invention discloses a mobile equipment screen protection device which comprises a pressure detection unit, a pressure range storage unit, a pressure comparison unit, a brightness detection unit, a controller, a double-color LED light display and a voice alarm. Two detection ends of the pressure comparison unit are respectively connected with the pressure detection unit and the pressure range storage unit, output of the pressure comparison unit is connected to the controller, the controller is further connected with the brightness detection unit, the voice alarm and the double-color LED light display, and the brightness detection unit is arranged on the lateral side of the mobile equipment. The invention further discloses a mobile equipment screen protection method which includes prompting once the mobile equipment screen protection device detects hazards in stress, and making different prompts according to different stress so that users make different solutions rather than do blind operations.
Description
Technical field
The present invention relates to the screen protective device and method of a kind of screen protection method, particularly mobile device.
Background technology
With the development of science and technology, the continuous improvement to Intelligent mobile equipment technology, mobile device does lighter and handier and lighter and handy, but screen
Curtain does thinner and thinner, causes screen to be easier to go to sticks and staves, and especially present smart mobile phone is all mostly the design of touch screen, once I
Place improper or improper use a certain degree of damage caused to the screen of equipment；Therefore how in use to screen
Real-time pressure detection warning, be at present to the important key of screen protection.
The content of the invention
The invention aims to solve above-mentioned the deficiencies in the prior art and provide a kind of real-time detection screen of being capable of
Stressing conditions, while making different prompting with the screen protective device of the mobile device for preventing user from damaging screen as early as possible
And method.
To achieve these goals, the screen protective device of the mobile device designed by the present invention, including：
For the pressure sensing cell of testing equipment screen pressure size；
For the pressure limit storage element of storage corresponding device pressure limit in advance；
For the pressure for being contrasted the screen for detecting pressure with the pressure limit being stored in pressure limit storage element
Comparison unit；
For the brightness detection unit of testing equipment use environment；
For controlled output change after the data variation for analyzing pressure comparison unit and the data for obtaining brightness detection unit
Controller；
For exporting the dual-colored LED lamp display of different colours；
For the voice guard of audible alarm；
Wherein, two test sides of the pressure comparison unit detector unit store respectively with pressure sensing cell and pressure limit
Unit connects, and pressure comparison unit output is connected with controller, the controller also with brightness detection unit, audible alarm
Device and dual-colored LED lamp display connect, and the brightness detection unit is located at the side of mobile device.
By said structure design so that, when equipment detects stress and crisis occurs, immediately pointed out, while root
Different promptings are carried out according to the size of stress, is finally allowed user to make different replies and is promoted, operated without the carrying out of blindness.
In order to economize on resources, there is provided service life, it is also associated with adjusting between described dual-colored LED lamp display and controller
Optical circuit, described light adjusting circuit receives the signal of controller, when controller is excessive according to the brightness detection unit, by controlling
Device adjusts light adjusting circuit so as to the brightness of controlled output dual-colored LED lamp display.
Present invention also offers a kind of screen protection method of mobile device, including using the one kind in the claims
The screen protective device of mobile device, specifically using following steps：
（a）Pre-set screen maximum bear pressure limit and with preserve；Respectively maximum pressure tolerance range is represented with Pmax, used
Pmin represents minimum pressure tolerance range；
（b）Obtain the pressure state that screen currently bears：Mainly, as time period, within the time period screen is detected with per 5 minutes
The number of times being stressed and corresponding pressure value, are then averaged by calculating and obtain the pressure being subject in 5 minutes
Pressure state value Pz of the meansigma methodss as final detection；
（c）Step is contrasted by contrast module（b）In pressure state value Pz that obtains and be stored in pressure limit storage element
Interior pressure value is contrasted, and when the value of pressure state value Pz is less than minima Pmin in pressure limit storage element, is said
Bright pressure limit meets the requirements, and when the value scope of pressure state value Pz is in Pmin≤Pz≤Pmax, now controller is detected
After the data, pointed out by voice guard；Once when the value of pressure state value Pz is more than Pmax, jump to next
Step：
（d）Controller opens immediately brightness detection unit, the environment by described in brightness detection unit detects current device；Work as detection
To currently during the day, or brightness ratio it is brighter when, pointed out with red light by controller control dual-colored LED lamp display；
When current unglazed at night or dark brightness ratio is detected, carried out with white light by controller control dual-colored LED lamp display
Prompting.
For energy-conservation, while increase the service life, in step（d）In open brightness detection unit immediately by bright when controller
Environment described in degree detector unit detection current device；When detect it is current during the day, or brightness ratio it is brighter when, first by
Controller control light adjusting circuit adjusts the output brightness of dual-colored LED lamp display red light makes its brightness brighten；Work as when detecting
During front unglazed at night or dark brightness ratio, light adjusting circuit is controlled by controller and adjusts the bright of dual-colored LED lamp display white light
Degree makes its colour-darkening.
The screen protective device and method of the mobile device that the present invention is obtained, by the design of the invention, inspection in real time
The stressing conditions of measurement equipment screen, when stress size is in the range of presetting, are pointed out, for user by sound
Adjust by situation, when stress size exceedes maximum magnitude set in advance, now detect the use environment of current device, so
Afterwards according to the brightness of environment as output foundation come the prompting effect of controlled output, while brightness can be exported according to brightness regulation
With energy saving and the service life of raising equipment.
Description of the drawings
Fig. 1 is a kind of structural representation of the screen protective device of mobile device that embodiment 1 is provided；
Fig. 2 is that embodiment 2 provides a kind of structural representation of the screen protective device of mobile device.
In figure：Pressure sensing cell 1, pressure limit storage element 2, pressure comparison unit 3, brightness detection unit 4, control
Device 5, dual-colored LED lamp display 6, voice guard 7, light adjusting circuit 8, input equipment 10.
Specific embodiment
Below by embodiment, the present invention is further described.
Embodiment 1：
As shown in figure 1, the screen protective device of the mobile device of the present embodiment offer, including：
For the pressure sensing cell 1 of testing equipment screen pressure size；
For the pressure limit storage element 2 of storage corresponding device pressure limit in advance；
For the pressure for being contrasted the screen for detecting pressure with the pressure limit being stored in pressure limit storage element 2
Comparison unit 3；
For the brightness detection unit 4 of testing equipment use environment；
Change for controlled output after the data variation for analyzing pressure comparison unit 3 and the data for obtaining brightness detection unit 4
Controller 5；
For exporting the dual-colored LED lamp display 6 of different colours；
For the voice guard 7 of audible alarm；
Wherein, two test sides of the detector unit of pressure comparison unit 3 are stored up respectively with pressure sensing cell 1 and pressure limit
Memory cell 2 connects, and the pressure comparison unit 3 output is connected with controller 5, the controller 5 also with brightness detection unit 4,
Voice guard 7 and dual-colored LED lamp display 6 connect, and the brightness detection unit 4 is located at the side of mobile device.
Present invention also offers a kind of screen protection method of mobile device, including using the one kind in the claims
The screen protective device of mobile device, specifically using following steps：
（a）Pre-set screen maximum bear pressure limit and with preserve；Respectively maximum pressure tolerance range is represented with Pmax, used
Pmin represents minimum pressure tolerance range；
（b）Obtain the pressure state that screen currently bears：Mainly, as time period, within the time period screen is detected with per 5 minutes
The number of times being stressed and corresponding pressure value, are then averaged by calculating and obtain the pressure being subject in 5 minutes
Pressure state value Pz of the meansigma methodss as final detection；
（c）Step is contrasted by contrast module（b）In pressure state value Pz that obtains and be stored in pressure limit storage element 2
Interior pressure value is contrasted, and when the value of pressure state value Pz is less than minima Pmin in pressure limit storage element 2, is said
Bright pressure limit meets the requirements, and when the value scope of pressure state value Pz is in Pmin≤Pz≤Pmax, now controller 5 is detected
To after the data, pointed out by voice guard 7；Once when the value of pressure state value Pz is more than Pmax, jump to down
One step：
（d）Controller 5 opens immediately brightness detection unit 4, the environment by described in brightness detection unit 4 detects current device；When
Detect it is current during the day, or brightness ratio it is brighter when, control dual-colored LED lamp display 6 by controller 5 is carried out with red light
Prompting；When current unglazed at night or dark brightness ratio is detected, dual-colored LED lamp display 6 is controlled with vain by controller 5
Light is pointed out.
By the innovation and creation involved by the present embodiment during mobile device or the apparatus processing with screen
Completed in the lump, when now consumer buys the product with this device, be now input into by input equipment 10 corresponding
Value of Pmin and Pmax values, can in advance detect the maximum pressure scope of device screen typically during process equipment, therefore
There is a reference value to be referred on equipment, once after the completion of input equipment input, system is preserved, Opening pressure detection
Function, now real-time detection be used for pressure condition to screen, by the pressurized situation of the real-time detection of pressure sensing cell 1, then
By being used as a scope per 5 minutes, by detecting pressure condition of the user to screen in 5 minutes, each data is entered
Row is preserved, and then takes the meansigma methodss of stress in this 5 minutes as reference data and then by pressure comparison unit 3 and pressure limit
Data in storage element 2 are compared, once the data of contrast are more than Pmax values, it is single that controller 5 controls at once brightness detection
Unit 4 works, the ambient conditions that now inside of brightness detection unit 4 is used by light sensation probe testing equipment, e.g. daytime,
Or evening be where dark or it is bright where, be then converted into electric signal transmission to controller 5, controller 5 is examined
Measure and made a distinction after the signal, once detect be daytime or it is bright where, dual-colored LED lamp is now controlled at once and is shown
Red LED lamp work inside device 6 is to make significantly prompting, once it is where dark or than dark ground to detect
Side, controls at once the white led lamps work inside dual-colored LED lamp display 6 to make significantly prompting, so by the prompting on daytime
Substantially distinguished with the prompting in evening, for what user can be cleaned prompting effect is seen, because daytime is using white
Not substantially, evening is brighter and dazzling using red colored lamp, therefore the design of said method had both solved varying environment not for lamp prompting
With prompting effect, solve the problems, such as again to eye injury, improve safety；Can also substantially distinguish pressure limit simultaneously to exist
Pressure between Pmax and Pmin, once the pressure of detection is within the range, is pointed out, so as to give by voice guard 7
The effect of one warning of user, with this control of oneself pressure to screen is preferably adjusted.
Embodiment 2：
As shown in Fig. 2 the screen protective device of mobile device and the general configuration of method and the phase of embodiment 1 of the present embodiment offer
Together, except for the difference that 2, the screen protective device of mobile device according to claim 1, is characterized in that：Described dual-colored LED
Light adjusting circuit 8 is also associated between lamp display 6 and controller 5, described light adjusting circuit 8 receives the signal of controller 5, works as control
Device processed 5 according to the brightness detection unit 4 it is excessive when, light adjusting circuit 8 is adjusted so as to controlled output dual-colored LED lamp shows by controller 5
Show the brightness of device 6；Specifically adopt with the following method：The step of embodiment 1（d）In when controller 5, that brightness detection is opened immediately is single
First 4 environment by described in brightness detection unit 4 detects current device；When detect it is current during the day, or brightness ratio is brighter
When, control light adjusting circuit 8 by controller 5 first and adjust the output brightness of the red light of dual-colored LED lamp display 6 to become its brightness
It is bright；When current unglazed at night or dark brightness ratio is detected, light adjusting circuit 8 is controlled by controller 5 and adjusts dual-colored LED lamp
The brightness of the white light of display 6 makes its colour-darkening；By said structure, output brightness is adjusted using light adjusting circuit 8, preferably
The waste of electricity is saved, and LED can have been played a very good protection again, improved its service life, while light modulation
The design of circuit 8 is caused in the case where brightness ratio is brighter, allows the effect of prompting to become apparent from.
Claims (4)
1. a kind of screen protective device of mobile device, including：
For the pressure sensing cell of testing equipment screen pressure size（1）；
For the pressure limit storage element of storage corresponding device pressure limit in advance（2）；
For by the screen for detecting pressure be stored in pressure limit storage element（2）The pressure that interior pressure limit is contrasted
Power comparison unit（3）；
For the brightness detection unit of testing equipment use environment（4）；
For analyzing pressure comparison unit（3）Data variation and obtain brightness detection unit（4）Data after controlled output
The controller of change（5）；
For exporting the dual-colored LED lamp display of different colours（6）；
For the voice guard of audible alarm（7）；
Wherein, the pressure comparison unit（3）Two test sides of detector unit respectively with pressure sensing cell（1）With pressure model
Enclose storage element（2）Connection, the pressure comparison unit（3）Output and controller（5）Connection, the controller（5）Also with it is bright
Degree detector unit（4）, voice guard（7）With dual-colored LED lamp display（6）Connection, the brightness detection unit（4）Located at shifting
The side of dynamic equipment.
2. the screen protective device of mobile device according to claim 1, is characterized in that：Described dual-colored LED lamp shows
Device（6）With controller（5）Between be also associated with light adjusting circuit（8）, described light adjusting circuit（8）Receive controller（5）Signal,
Work as controller（5）According to the brightness detection unit（4）When excessive, by controller（5）Adjustment light adjusting circuit（8）So as to controlled output
Dual-colored LED lamp display（6）Brightness.
3. a kind of screen protection method of mobile device, including using any one claim institute in the claims 1-2
A kind of screen protective device of the mobile device stated, is characterized in that：Specifically adopt following steps：
（a）Pre-set screen maximum bear pressure limit and with preserve；Respectively maximum pressure tolerance range is represented with Pmax, used
Pmin represents minimum pressure tolerance range；
（b）Obtain the pressure state that screen currently bears：Mainly, as time period, within the time period screen is detected with per 5 minutes
The number of times being stressed and corresponding pressure value, are then averaged by calculating and obtain the pressure being subject in 5 minutes
Pressure state value Pz of the meansigma methodss as final detection；
（c）Step is contrasted by contrast module（b）In pressure state value Pz that obtains and be stored in pressure limit storage element
（2）Interior pressure value is contrasted, when the value of pressure state value Pz is less than pressure limit storage element（2）Interior minima Pmin
When, illustrate that pressure limit meets the requirements, when the value scope of pressure state value Pz is in Pmin≤Pz≤Pmax, now controller
（5）After detecting the data, by voice guard（7）Pointed out；Once when pressure state value Pz value be more than Pmax when,
Jump to next step：
（d）Controller（5）Brightness detection unit is opened immediately（4）, by brightness detection unit（4）Ring described in detection current device
Border；When detect it is current during the day, or brightness ratio it is brighter when, by controller（5）Control dual-colored LED lamp display（6）With
Red light is pointed out；When current unglazed at night or dark brightness ratio is detected, by controller（5）Control dual-colored LED
Lamp display（6）Pointed out with white light.
4. the screen protection method of mobile device according to claim 3, is characterized in that：In step（d）In work as controller
（5）Brightness detection unit is opened immediately（4）By brightness detection unit（4）Environment described in detection current device；Work as when detecting
It is front during the day, or brightness ratio it is brighter when, first by controller（5）Control light adjusting circuit（8）Adjust dual-colored LED lamp display
（6）The output brightness of red light makes its brightness brighten；When current unglazed at night or dark brightness ratio is detected, by controlling
Device（5）Control light adjusting circuit（8）Adjust dual-colored LED lamp display（6）The brightness of white light makes its colour-darkening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611076790.7A CN106681888A (en) | 2016-11-30 | 2016-11-30 | Mobile equipment screen protection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611076790.7A CN106681888A (en) | 2016-11-30 | 2016-11-30 | Mobile equipment screen protection device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106681888A true CN106681888A (en) | 2017-05-17 |
Family
ID=58866977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611076790.7A Pending CN106681888A (en) | 2016-11-30 | 2016-11-30 | Mobile equipment screen protection device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106681888A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101763195A (en) * | 2010-01-08 | 2010-06-30 | 青岛海信移动通信技术股份有限公司 | Method for preventing mobile terminal touch screen from being damaged and relevant device |
| CN104808923A (en) * | 2015-05-25 | 2015-07-29 | 联想(北京)有限公司 | Screen control method and electronic equipment |
| CN104867478A (en) * | 2015-05-20 | 2015-08-26 | 胡桂钢 | Method for controlling the brightness of intelligent device and intelligent device |
| CN105469003A (en) * | 2015-11-25 | 2016-04-06 | 小米科技有限责任公司 | Screen protection method and device |
| CN105930169A (en) * | 2016-05-13 | 2016-09-07 | 深圳天珑无线科技有限公司 | Screen break effect displaying method and system of screen capable of sensing pressure |
-
2016
- 2016-11-30 CN CN201611076790.7A patent/CN106681888A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101763195A (en) * | 2010-01-08 | 2010-06-30 | 青岛海信移动通信技术股份有限公司 | Method for preventing mobile terminal touch screen from being damaged and relevant device |
| CN104867478A (en) * | 2015-05-20 | 2015-08-26 | 胡桂钢 | Method for controlling the brightness of intelligent device and intelligent device |
| CN104808923A (en) * | 2015-05-25 | 2015-07-29 | 联想(北京)有限公司 | Screen control method and electronic equipment |
| CN105469003A (en) * | 2015-11-25 | 2016-04-06 | 小米科技有限责任公司 | Screen protection method and device |
| CN105930169A (en) * | 2016-05-13 | 2016-09-07 | 深圳天珑无线科技有限公司 | Screen break effect displaying method and system of screen capable of sensing pressure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104464686B (en) | A kind of method for controlling display brightness and electronic equipment | |
| AU2013202359A1 (en) | Method and system for automatically adjusting television volume, television set and television remote controller | |
| CN104469022B (en) | A kind of backlight adjusting method, system and handheld terminal | |
| CN104168371A (en) | Method for adjusting backlight brightness of mobile terminal and mobile terminal | |
| CN101858783A (en) | Reading prompt method in electronic reading terminal and electronic reading terminal | |
| CN106875922A (en) | Display terminal display brightness method of adjustment and device | |
| CN106403178A (en) | Control method and device of air conditioner and air conditioner | |
| CN103226438A (en) | Method and system for desktop subject display mode based on light intensity adjustable panel terminal | |
| CN104582192B (en) | Remote control method for controlling backlight thereof and system | |
| CN106657676A (en) | Screen brightness adjusting method and device | |
| AU2015411280B2 (en) | Intelligent charger with diagnostic function and charging method | |
| CN107134273A (en) | Luminance compensation method, device and terminal | |
| CN106601210A (en) | Display anti-visual fatigue system and method | |
| CN109064997A (en) | Automatically adjust the method and display device of display device output colour temperature | |
| CN107747799A (en) | Control method, remote control, air-conditioning system and the readable storage medium storing program for executing of remote control | |
| CN106681888A (en) | Mobile equipment screen protection device and method | |
| CN106851902A (en) | A kind of wireless distances induced intelligent lamp group and intelligent adjusting method | |
| CN201993551U (en) | Reaction speed and time-delay time testing arrangement of hand-held auto-changing shade welding mask | |
| CN105407231B (en) | A kind of backlight brightness control method and system of terminal device | |
| CN100378767C (en) | Method for regulating brightness of display device | |
| CN106937462A (en) | A kind of control method and terminal of terminal indicator lamp | |
| CN201624874U (en) | Automatic variable welding filter with automatic shielding signal setting | |
| CN105866703B (en) | Intelligent tester device for simulating automobile starting and testing method | |
| CN107702781A (en) | A kind of intelligent scale awakening method and system | |
| CN204462003U (en) | A kind of fermentation of black tea appropriateness decision maker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170517 |
|
| WD01 | Invention patent application deemed withdrawn after publication |