CN108135513A - A kind of button operation triggering method based on heart rate signal, apparatus and system - Google Patents
A kind of button operation triggering method based on heart rate signal, apparatus and system Download PDFInfo
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- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
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Abstract
A kind of button operation triggering method based on heart rate signal, apparatus and system, are related to wearable device technical field.This method includes：The optical signal of the tested position reflection of acquisition and the intensity (S1) for detecting reflected light signal；When the intensity of reflected light signal is located in preset threshold range, continuous acquisition reflected light signal interior for a period of time (S2)；When the intensity of reflected light signal is stablized whithin a period of time in default variation range, heart rate signal is acquired, and detect the intensity (S3) of heart rate signal by tested position；When the intensity of heart rate signal is less than predetermined threshold value whithin a period of time, button operation (S4) is triggered.This method can reduce the hardware for realizing button operation, be advantageously implemented the extremely simplified and Highgrade integration of hardware.
Description
The present embodiments relate to wearable device technical field more particularly to a kind of button operation triggering methods based on heart rate signal, apparatus and system.
With the development of technology, more and more intelligent wearable devices are equipped with device, such as Intelligent bracelet, smartwatch, heart rate earphone of optical detection heart rate etc..
The heart rate detection module of such equipment generallys use method progress heart rate signal detection shown in FIG. 1 in Figure of description.The method mainly utilizes the diffusing reflection of light, incident light source uses the light (such as green light, feux rouges of 660nm-720nm of 500nm-560nm etc.) of certain wavelength, it is transmitted through human body at an angle, then it is received by photoelectric sensor and is detected the reflected optical signal in position through human body, final optical signal acquisition PPG (Photo Plethysmo Graphy the utilizes photoplethysmographic graphical method) signal that decomposes calculates heart rate.
In the prior art, the human-computer interaction channel of such equipment is usually the key of peripheral hardware, generates electric signal by squeezing key, realizes the control to equipment.Such man-machine interaction mode needs more hardware support, is unfavorable for realizing hardware extremely simplification and the Highgrade integration of such equipment.
Summary of the invention
In order to reduce the hardware of wearable device button operation, a kind of button operation triggering method and device based on heart rate signal described in the embodiment of the present invention uses technical solution below.
A kind of first technical solution used in the embodiment of the present invention are as follows: button operation triggering method based on heart rate signal, comprising:
It acquires the optical signal of tested position reflection and detects the intensity of the reflected light signal；
When the intensity of the reflected light signal is located in preset threshold range, the continuous acquisition reflected light signal interior for a period of time；
When the intensity of the reflected light signal is stablized within described a period of time in default variation range, heart rate signal is acquired by the tested position, and detect the intensity of the heart rate signal；
When the intensity of the heart rate signal is less than preset threshold whithin a period of time, button operation is triggered.
It is preferably, described that heart rate signal is acquired by the tested position, comprising:
Emit light to the tested position, the intensity of the transmitting light is enough to transmit into the tested part interior；
It receives by the optical signal of the tested part interior reflection；
The optical signal for analyzing the tested part interior reflection, obtains heart rate signal.
Preferably, when the intensity of the heart rate signal is less than preset threshold whithin a period of time, button operation is triggered, comprising:
1 second heart rate signal of continuous acquisition and the intensity for detecting the heart rate signal；
Detect strength fluctuation peak-to-peak value of the heart rate signal in 1 second；
When the peak-to-peak value is less than preset threshold, the button operation is triggered.
Preferably, when the peak-to-peak value is greater than preset threshold, continue the heart rate signal of acquisition 1 second.
Preferably, the intensity of the reflected light signal is stable in default variation range whithin a period of time, comprising:
The intensity of the reflected light signal is stablized in 100 milliseconds in default variation range.
A kind of second technical solution used in the embodiment of the present invention are as follows: button operation triggering based on heart rate signal
Device, comprising:
Light signal collection module and optical signal detecting module；
The light signal collection module is used to acquire the optical signal and heart rate signal of tested position reflection；
The optical signal detecting module is for detecting the intensity of the reflected light signal and the intensity of the heart rate signal；
The light signal collection module acquires the optical signal of tested position reflection, and the optical signal detecting module detects the intensity of the reflected light signal；
When the intensity of the reflected light signal is located in preset threshold range, the light signal collection module continuous acquisition reflected light signal interior for a period of time；
When the intensity of the reflected light signal is stablized within described a period of time in default variation range, the light signal collection module acquires heart rate signal by the tested position, and the optical signal detecting module detects the intensity of the heart rate signal；
When the intensity of the heart rate signal is less than preset threshold whithin a period of time, the optical signal detecting module triggers button operation.
Preferably, the light signal collection module acquires heart rate signal by the tested position, comprising:
The light signal collection module emits light to the tested position, and the intensity of the transmitting light is enough to transmit into the tested part interior；
The light signal collection module is received by the optical signal of the tested part interior reflection；
It is tested the optical signal of part interior reflection described in the light signal collection module analysis, obtains heart rate signal.
Preferably, when the intensity of the heart rate signal is less than preset threshold whithin a period of time, the optical signal detecting module triggers button operation, comprising:
1 second heart rate signal of the light signal collection module continuous acquisition, the optical signal detecting module detection
The intensity of the heart rate signal；
The optical signal detecting module detects strength fluctuation peak-to-peak value of the heart rate signal in 1 second；
When the peak-to-peak value is less than preset threshold, the optical signal detecting module triggers the button operation.
Preferably, when the optical signal detecting module detects that the peak-to-peak value is greater than preset threshold, the light signal collection module continues the heart rate signal of acquisition 1 second.
Preferably, the intensity of the reflected light signal is stable in default variation range whithin a period of time, comprising:
The intensity that the optical signal detecting module detects the reflected light signal is stablized in 100 milliseconds in default variation range.
Third technical solution used in the embodiment of the present invention are as follows: a kind of system, including the button operation trigger device described in aforementioned second technical solution based on heart rate signal.
The embodiment of the present invention is by acquiring the optical signal and the intensity for detecting the reflected light signal that tested position is reflected.When the intensity of the reflected light signal is located in preset threshold range, the continuous acquisition reflected light signal interior for a period of time, and detect the intensity of the reflected light signal.When the intensity of the reflected light signal is stablized within described a period of time in default variation range, heart rate signal is acquired by the tested position, and detect the intensity of the heart rate signal.When the intensity of the heart rate signal is less than preset threshold whithin a period of time, button operation is triggered.The embodiment of the present invention can reduce the hardware for realizing button operation, be advantageously implemented the extremely simplified and Highgrade integration of hardware.
Fig. 1 is human heart rate's signal detecting method schematic diagram.
Fig. 2 is the flow chart of the button operation triggering method based on heart rate signal described in the embodiment of the present invention.
Fig. 3 is the schematic diagram of human body optical signal and non-human optical signal described in the embodiment of the present invention.
Fig. 4 is that light described in the embodiment of the present invention is transmitted through inside of human body and then is reflected back the schematic diagram of the signal strength Δ AC2 of equipment sensing device.
Fig. 5 is the feature schematic diagram of heart rate signal under different pressures of embodiment of the present invention value.
Fig. 6 is the schematic diagram of the button operation trigger device based on heart rate signal described in the embodiment of the present invention.
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.Presently preferred embodiments of the present invention is given in attached drawing.But the invention can be realized in many different forms, however it is not limited to embodiment described herein.It is made the disclosure of the present invention more thorough and comprehensive on the contrary, purpose of providing these embodiments is.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.Term as used herein in the specification of the present invention, which is only for the purpose of describing specific embodiments, is not intended to limit the present invention.
It is the flow chart of the button operation triggering method based on heart rate signal described in the embodiment of the present invention with reference to Fig. 2.Button operation triggering method described in the embodiment of the present invention based on heart rate signal includes the following contents:
Step S1: acquiring the optical signal of tested position reflection and detects the intensity of the reflected light signal.
In embodiments of the present invention, the purpose of step S1 is whether the optical signal for judging that tested position is reflected is human body optical signal.
When the illumination of specific wavelength is mapped to human skin surface, due to the optical characteristics of skin, specific ratio is presented in absorptivity and reflectivity to light.According to this feature, can judge whether the optical signal of tested position reflection is human body optical signal.
Optionally, just reduce the luminous power of incident light source after opening of device automatically, acquire the optical signal of tested position reflection and detect the intensity of the reflected light signal, judge whether received optical signal is human body optical signal.
It is the schematic diagram of human body optical signal and non-human optical signal described in the embodiment of the present invention with reference to Fig. 3.Δ DC1 indicates that light returns the signal strength of equipment sensing device from non-human surface reflection.Under normal conditions, since light is difficult to be transmitted into non-human inside, so non-human optical signal does not have light and is transmitted into Strength Changes caused by non-human inside.Δ DC2 indicates that light is reflected back the signal strength of equipment sensing device from human skin surface, and Δ AC2 indicates that light is transmitted through inside of human body and then is reflected back the signal strength of equipment sensing device.When incident light source irradiates human skin surface with certain luminous intensity, the signal strength of human skin surface's reflection is in a fixed threshold range, when Δ DC2 be in this fixed threshold range (incident light source luminous intensity difference when, fixed threshold range locating for the signal strength of human skin surface's reflection is also different) when, it can judge that the optical signal sensed is human body optical signal.
Step S2: when the intensity of the reflected light signal is located in preset threshold range, the continuous acquisition reflected light signal interior for a period of time.
In embodiments of the present invention, if the optical signal of tested position reflection is human body optical signal, the purpose of implementation steps S2 is to judge that can the stability of reflected light signal meet the requirement of acquisition heart rate signal.
Optionally, when the intensity of the reflected light signal is located in preset threshold range, the reflected light signal in 100 milliseconds of continuous acquisition, and detect Strength Changes of the reflected light signal in 100 milliseconds.
Specially, reflected light signal in one period of continuous acquisition, if in 100 milliseconds, the strength fluctuation range of reflected light signal is stable, and (the default fluctuation range refers in default fluctuation range, in normal fluctuation range corresponding with the luminous intensity of incident light source, when the luminous intensity difference of incident light source, the intensity normal fluctuation range of corresponding reflected light signal is also different), then it is assumed that the stability of reflected light signal meets the requirement of acquisition heart rate signal.
Step S3: when the intensity of the reflected light signal is stablized within described a period of time in default variation range, heart rate signal is acquired by the tested position, and detect the intensity of the heart rate signal.
Optionally, when the intensity of the reflected light signal is stablized in 100 milliseconds in default variation range, heart rate signal is acquired by the tested position.
Optionally, emit light to the tested position, the intensity of the transmitting light is enough to transmit into the tested part interior, receives the optical signal reflected by the tested part interior, analyzes the optical signal of the tested part interior reflection, obtains heart rate signal.
The volumetric blood of inside of human body can show specific variation with the bounce of heart.When light is transmitted through inside of human body, specific variation will also be showed by the volumetric blood in light transmission position.
With reference to Fig. 4, inside of human body is transmitted through for light described in the embodiment of the present invention and then is reflected back the schematic diagram of the signal strength Δ AC2 of equipment sensing device.What the variation characteristic of Δ AC2 was presented is the heart rate feature by the variation characteristic of the volumetric blood in light transmission position namely human body.Therefore, it can be transmitted through inside of human body with light and then be reflected back the change in signal strength of change in signal strength reflection human heart rate's signal of the Δ AC2 of equipment sensing device.
Optionally, the intensity of optical signal can be increased by increasing luminous power, so that the feature of collected heart rate signal becomes apparent.
Step S4: when the intensity of the heart rate signal is less than preset threshold whithin a period of time, button operation is triggered.
When key, equipment squeezes the tissue at light transmission position, since the subcutaneous tissues such as blood vessel are oppressed, leads to stasis, heart rate signal, which is affected by this, can also weaken even to disappearance.When the pressure of key is bigger, the weakened of heart rate signal is more obvious.
It is the feature of heart rate signal under different pressures of embodiment of the present invention value with reference to Fig. 5.When pressing pressure value from
100g is promoted to 500g, and single increases 100g, can obviously observe in Fig. 5, the intensity of heart rate signal gradually weakens with the increase of pressure value.Since the subcutaneous tissues such as blood vessel are oppressed, lead to stasis, causes the intensity of heart rate signal that can also weaken even to disappearance.The heart rate of normal person is 30BPM~220BPM (Beat Per Minute beats per minute), so can at least detect half of heart rate waveform within 1 second time.
Optionally, 1 second heart rate signal of continuous acquisition and the intensity of the heart rate signal is detected, detects strength fluctuation peak-to-peak value of the heart rate signal in 1 second, when the peak-to-peak value is less than preset threshold, triggers button operation.
Optionally, when detecting that the peak-to-peak value is greater than preset threshold, continue the heart rate signal of acquisition 1 second.Then the wave crest and trough for searching for heart rate signal then trigger button operation when maximum peak-to-peak value is less than preset threshold value.
Button operation triggering method described in the embodiment of the present invention based on heart rate signal judges whether it is human body optical signal by acquiring the optical signal and the intensity for detecting the reflected light signal that tested position is reflected.When the intensity of the reflected light signal is located in preset threshold range, the continuous acquisition reflected light signal interior for a period of time, and Strength Changes of the reflected light signal in 100 milliseconds are detected, judge whether the stability of reflected light signal meets the requirement of acquisition heart rate signal.When the intensity of the reflected light signal is stablized in 100 milliseconds in default variation range, 1 second heart rate signal of continuous acquisition and the intensity for detecting the heart rate signal, detect strength fluctuation peak-to-peak value of the heart rate signal in 1 second, when the peak-to-peak value is less than preset threshold, the button operation is triggered.Thus, the button operation triggering method described in the embodiment of the present invention based on heart rate signal, it is possible to reduce realize the hardware of button operation, be advantageously implemented the extremely simplified and Highgrade integration of hardware.
It is the schematic diagram of the button operation trigger device based on heart rate signal described in the embodiment of the present invention with reference to Fig. 6.Button operation trigger device described in the embodiment of the present invention based on heart rate signal includes:
Light signal collection module 100 and optical signal detecting module 200.
The light signal collection module 100 is used to acquire the optical signal and heart rate signal of tested position reflection.
The optical signal detecting module 200 is for detecting the intensity of the reflected light signal and the intensity of the heart rate signal.
The light signal collection module 100 acquires the optical signal of tested position reflection, and the optical signal detecting module 200 detects the intensity of the reflected light signal.
Optionally, the intensity that the optical signal detecting module 200 detects the reflected light signal is stablized in 100 milliseconds in default variation range.
When the intensity of the reflected light signal is located in preset threshold range, 100 continuous acquisition of the light signal collection module reflected light signal interior for a period of time.
When the intensity of the reflected light signal is stablized within described a period of time in default variation range, the light signal collection module 100 acquires heart rate signal by the tested position, and the optical signal detecting module 200 detects the intensity of the heart rate signal.
Optionally, the light signal collection module 100 emits light to the tested position, and the intensity of the transmitting light is enough to transmit into the tested part interior.The light signal collection module 100 is received by the optical signal of the tested part interior reflection.The light signal collection module 100 analyzes the optical signal of the tested part interior reflection, obtains heart rate signal.
When the intensity of the heart rate signal is less than preset threshold whithin a period of time, the optical signal detecting module 200 triggers button operation.
Optionally, 100 1 second heart rate signal of continuous acquisition of light signal collection module, the optical signal detecting module 200 detect the intensity of the heart rate signal.The optical signal detecting module 200 detects strength fluctuation peak-to-peak value of the heart rate signal in 1 second.When the peak-to-peak value is less than preset threshold, the optical signal detecting module 200 triggers the button operation.
Optionally, when the optical signal detecting module 200 detects that the peak-to-peak value is greater than preset threshold, institute
State the heart rate signal that light signal collection module 100 continues acquisition 1 second.Then, the optical signal detecting module 200 continues to test strength fluctuation peak-to-peak value of the heart rate signal in 1 second.When the peak-to-peak value is less than preset threshold, the optical signal detecting module 200 triggers the button operation.
After the wearable device unlatching for carrying the button operation trigger device based on heart rate signal, the light signal collection module 100 acquires the optical signal of tested position reflection, and then the optical signal detecting module 200 detects the intensity of the reflected light signal.If the intensity of the reflected light signal is located in preset threshold range, the optical signal detecting module 200 judges the collected optical signal of the light signal collection module 100 for human body optical signal.
If the reflected light signal is human body optical signal, 100 continuous acquisition of the light signal collection module reflected light signal interior for a period of time, then the optical signal detecting module 200 detects the intensity of the reflected light signal, judges the stability of the reflected light signal.
Specifically, the optical signal in one period of 100 continuous acquisition of light signal collection module, the optical signal detecting module 200 judges whether the intensity of the reflected light signal is stable in default variation range in 100 milliseconds.If in 100 milliseconds, the fluctuation range of optical signal is stable, and (the default fluctuation range refers in default fluctuation range, in normal fluctuation range corresponding with the luminous intensity of incident light source, when the luminous intensity difference of incident light source, the normal fluctuation range of corresponding optical signal is also different), then it is assumed that the stability of optical signal meets the requirement of acquisition heart rate signal.
If the stability of reflected light signal meets the requirement of acquisition heart rate signal, heart rate signal in one period of 100 continuous acquisition of light signal collection module, the optical signal detecting module 200 detects the intensity of the heart rate signal, when meeting preset condition, triggers button operation.
Optionally, in embodiments of the present invention, carry the wearable device of the button operation trigger device based on heart rate signal, when whether the optical signal for opening tested position reflection described in light source detection is human body optical signal, the automatic luminous power for reducing light source, to save energy, extend equipment electricity uses the time.Work as the present invention
When the stability of reflected light signal described in embodiment meets default, the equipment increases the luminous power of light source, to enhance the feature of heart rate signal.
On the basis of previous embodiment disclosure, the embodiment of the present invention discloses a kind of system, and the system comprises the button operation trigger devices based on heart rate signal.
Optionally, the wearable device of the system to be a kind of the include button operation trigger device based on heart rate signal.Those skilled in the art should understand that arriving, when the system be it is a kind of include the wearable device of the button operation trigger device based on heart rate signal when, the meaning of " system " word refer to include multiple hardware modules wearable device it is whole.For example, a kind of can run application software, the Intelligent bracelet with communication function.
Optionally, the system comprises: be installed with the wearable device of the button operation trigger device based on heart rate signal, and for supporting the button operation trigger device based on heart rate signal to realize the terminal of its function.Optionally, the operation of the button operation trigger device described in the terminal control based on heart rate signal.For example, controlling the sensitivity when button operation trigger device operation based on heart rate signal, open and close of button operation trigger device described in control based on heart rate signal etc..
The terminal includes but is not limited to smart phone, tablet computer, laptop, desktop computer etc..
The structure of the button operation trigger device based on heart rate signal can be found in content disclosed in above-described embodiment, and details are not described herein again.
Button operation trigger device described in the embodiment of the present invention based on heart rate signal, the optical signal and heart rate signal of tested position reflection are acquired by light signal collection module 100, the intensity that the reflected light signal is detected by optical signal detecting module 200 judges whether the reflected light signal is human body optical signal.The intensity that the reflected light signal is detected by optical signal detecting module 200, judges whether the stability of the reflected light signal meets the requirement of acquisition heart rate signal.The intensity that the heart rate signal is detected by optical signal detecting module 200 when meeting preset condition, triggers button operation.Thus, based on heart rate signal described in the embodiment of the present invention
Button operation trigger device can effectively induce key trigger action, it is possible to reduce the hardware for realizing button operation is advantageously implemented the extremely simplified and Highgrade integration of hardware.
By the description of above embodiment, those skilled in the art can be understood that each embodiment can be realized by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, substantially the part that contributes to existing technology can be embodied in the form of software products above-mentioned technical proposal in other words, the computer software product may be stored in a computer readable storage medium, and execute method described in certain parts of each embodiment or embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that: it is still possible to modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；And these are modified or replaceed, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (11)
- A kind of button operation triggering method based on heart rate signal, which is characterized in that the described method includes:It acquires the optical signal of tested position reflection and detects the intensity of the reflected light signal；When the intensity of the reflected light signal is located in preset threshold range, the continuous acquisition reflected light signal interior for a period of time；When the intensity of the reflected light signal is stablized within described a period of time in default variation range, heart rate signal is acquired by the tested position, and detect the intensity of the heart rate signal；When the intensity of the heart rate signal is less than preset threshold whithin a period of time, button operation is triggered.
- The method according to claim 1, wherein described acquire heart rate signal by the tested position, comprising:Emit light to the tested position, the intensity of the transmitting light is enough to transmit into the tested part interior；It receives by the optical signal of the tested part interior reflection；The optical signal for analyzing the tested part interior reflection, obtains heart rate signal.
- Method according to claim 1 or 2, which is characterized in that when the intensity of the heart rate signal is less than preset threshold whithin a period of time, trigger button operation, comprising:1 second heart rate signal of continuous acquisition and the intensity for detecting the heart rate signal；Detect strength fluctuation peak-to-peak value of the heart rate signal in 1 second；When the peak-to-peak value is less than preset threshold, the button operation is triggered.
- According to the method described in claim 3, it is characterized in that, continuing the heart rate signal of acquisition 1 second when the peak-to-peak value is greater than preset threshold.
- Method according to any of claims 1-4, which is characterized in that the intensity of the reflected light signal is stable in default variation range whithin a period of time, comprising:The intensity of the reflected light signal is stablized in 100 milliseconds in default variation range.
- A kind of button operation trigger device based on heart rate signal characterized by comprisingLight signal collection module and optical signal detecting module；The light signal collection module is used to acquire the optical signal and heart rate signal of tested position reflection；The optical signal detecting module is for detecting the intensity of the reflected light signal and the intensity of the heart rate signal；The light signal collection module acquires the optical signal of tested position reflection, and the optical signal detecting module detects the intensity of the reflected light signal；When the intensity of the reflected light signal is located in preset threshold range, the light signal collection module continuous acquisition reflected light signal interior for a period of time；When the intensity of the reflected light signal is stablized within described a period of time in default variation range, the light signal collection module acquires heart rate signal by the tested position, and the optical signal detecting module detects the intensity of the heart rate signal；When the intensity of the heart rate signal is less than preset threshold whithin a period of time, the optical signal detecting module triggers button operation.
- Device according to claim 6, which is characterized in that the light signal collection module acquires heart rate signal by the tested position, comprising:The light signal collection module emits light to the tested position, and the intensity of the transmitting light is enough to transmit into the tested part interior；The light signal collection module is received by the optical signal of the tested part interior reflection；It is tested the optical signal of part interior reflection described in the light signal collection module analysis, obtains heart rate signal.
- Device according to claim 6 or 7, which is characterized in that when the intensity of the heart rate signal is less than preset threshold whithin a period of time, the optical signal detecting module triggers button operation, comprising:1 second heart rate signal of the light signal collection module continuous acquisition, the optical signal detecting module detect the intensity of the heart rate signal；The optical signal detecting module detects strength fluctuation peak-to-peak value of the heart rate signal in 1 second；When the peak-to-peak value is less than preset threshold, the optical signal detecting module triggers the button operation.
- Device according to claim 8, which is characterized in that when the optical signal detecting module detects that the peak-to-peak value is greater than preset threshold, the light signal collection module continues the heart rate signal of acquisition 1 second.
- According to device described in claim 6-9 any one, the intensity of the reflected light signal is stable in default variation range whithin a period of time, comprising:The intensity that the optical signal detecting module detects the reflected light signal is stablized in 100 milliseconds in default variation range.
- A kind of system, which is characterized in that including the button operation trigger device described in any one of claim 6-10 based on heart rate signal.
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| PCT/CN2016/094112 WO2018027529A1 (en) | 2016-08-09 | 2016-08-09 | Button operation method, apparatus, and system based on heart-rate signal |
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| Publication number | Publication date |
|---|---|
| CN108135513B (en) | 2021-02-12 |
| WO2018027529A1 (en) | 2018-02-15 |
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