KR102527762B1 - System for survival swimming education using virtual reality - Google Patents

Abstract

A system for survival swimming training using virtual reality is disclosed. The system for survival swimming training using virtual reality according to the present invention comprises: a VR device which provides a virtual reality screen; and a breathing control device which is controlled by the VR device. The breathing control device includes: a mask unit which comes in close contact with a user's face; a ventilation unit which is configured for ventilation inside and outside the mask unit; and a valve unit which opens and closes the ventilation unit. The valve unit can be controlled by the VR device.

Description

Survival swimming training system using virtual reality {SYSTEM FOR SURVIVAL SWIMMING EDUCATION USING VIRTUAL REALITY}

The present invention relates to a survival swimming training system using virtual reality. More specifically, the present invention relates to an education system in which a user can learn survival swimming without entering water by using virtual reality.

VR headsets are known from the prior art in a different format and serve to display artificially created representations in the field of view of the user. A VR headset consists of one or two display units, which serve for stereographic presentation. The user can perceive contents displayed on the display unit using each lens disposed within the user's field of view.

To this end, the VR headset may be positioned or fixed in front of the user's eyes above the user's head, and the contents expressed by the display unit should cover as wide an area as possible within the operator's field of view. A presentation machine of this type is used in particular for presenting so-called virtual reality content that is created digitally. The representation of virtual reality can be adjusted in real time with constant speed to the user's head movements according to the alignment and/or position of the VR headset, so that the presented virtual reality is very reliably perceived by the user and has a high degree of immersion. this is achieved

In general, when an accident by a ship or airplane occurs in the sea, many casualties occur. Therefore, before boarding a ship or airplane, wear a life jacket and receive an explanation on how to escape safely from the vessel or airplane.

However, when a distress accident occurs on a ship or airplane, the victims in need of rescue get confused in the imminent accident situation and forget what to do in case of an accident. need.

In this regard, the invention of a mobile survival swimming experience device has been disclosed. However, there is a problem of causing a serious waste of time, resources, and space when swimming is taught using a separate mobile device. In addition, there are people who cannot learn survival swimming in real water, such as those who have water phobia.

Accordingly, it is necessary to solve these problems by applying the recently developed VR technology.

KR200492067Y1 (Title of invention: mobile survival swimming experience device)

An object of the present invention is to provide an educational system in which a user can learn survival swimming without entering the water by using virtual reality.

In order to solve the above problems, the present invention includes a VR device for providing a virtual reality screen and a breathing control device controlled by the VR device, wherein the breathing control device includes a mask unit in close contact with the user's face, the A ventilation unit for ventilation of the inside and outside of the mask unit and a valve unit for opening and closing the ventilation unit may be controlled by the VR device.

In addition, the VR device may control the valve unit in a closed state when providing a virtual reality screen according to a first scenario, and control the valve unit in an open state when providing a virtual reality screen according to a second scenario. there is.

Also, the first scenario may be a scenario in which the user falls into the water, and the second scenario may be a scenario in which the user raises his/her face above the water after falling in the water.

In addition, the VR device may include a tilt sensor, and the VR device may provide a virtual reality screen according to the second scenario when a value measured by the tilt sensor is within a preset range.

In addition, the system may further include a ball pool having a size corresponding to the virtual reality screen.

In addition, the mask unit further includes a respiration sensor for measuring respiration therein, and the VR device may further include a control unit for controlling the valve unit and receiving respiration data measured from the respiration sensor.

In addition, the VR device may further include an external recognition unit for generating external image data according to the user's gaze direction.

The present invention has an effect of enabling the user to learn survival swimming without entering the water.

In addition, the present invention can provide the same state as actually entering the water by adjusting the user's breathing state.

In addition, the present invention detects the user's breathing state, measures the user's tension state, and provides appropriate feedback corresponding thereto to alleviate the user's tension, thereby providing survival swimming training more efficiently.

Effects obtainable according to the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

1 shows a survival swimming training system using virtual reality according to the present invention.
2 shows a breathing control device and a ball pool according to the present invention.
3 schematically shows a VR device according to the present invention.
4 schematically shows a control unit according to the present invention.
5 is a diagram showing an example of an image correction filter according to the present invention.
8 shows a HSV graph according to the present invention.
The accompanying drawings, which are included as part of the detailed description to aid understanding of the present specification, provide examples of the present specification and describe technical features of the present specification together with the detailed description.

Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings, but the same or similar elements are given the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In addition, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in this specification, the detailed description thereof will be omitted.

In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes included in the spirit and technical scope of the present invention , it should be understood to include equivalents or substitutes.

Terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as "comprise" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Hereinafter, a survival swimming training system using virtual reality according to a preferred embodiment of the present specification will be described in detail based on the above information.

Survival swimming is a swimming method that protects an individual's life in the water and helps to cope with a crisis. .

1 shows a survival swimming training system using virtual reality according to the present invention.

According to FIG. 1 , the survival swimming training system using virtual reality according to the present invention may include a breathing control device 100 and a VR device 200. In addition, the system according to the present invention may further include a ball pool (300).

Breath control device 100 may be worn on the user's face. The breathing control device 100 may be in close contact with the user's face and cover the user's mouth and nose. The breathing control device 100 may include an opening/closing means for controlling the user's breathing under the control of the VR device 200 .

The VR device 200 may refer to any device that can be worn on a user and provide a virtual reality screen to the user. The VR device 200 may provide a virtual reality screen for each predetermined scenario. In addition, the VR device 200 may configure the screen data received from the external server and provide it to the user as a virtual reality screen.

2 shows a breathing control device and a ball pool according to the present invention.

According to FIG. 2 (a), the breathing control device 100 according to the present invention includes a mask unit 110 in close contact with the user's face, a ventilation unit 120 for ventilation of the inside and outside of the mask unit 110, and a ventilation unit It may include a valve unit 130 that opens and closes (120). The mask unit 110 may be in close contact with the user's face to block internal and external air. The mask unit 110 may have a shape that covers the user's mouth and nose. The mask unit 110 may be connected to the drawstring 111 to be in close contact with the user's face, and the drawstring 111 may adhere and fix the mask portion 110 to the user's face.

The ventilation unit 120 is formed to pass through one side of the mask unit 110 and may pass through the inside and outside of the mask unit 110 . The ventilation unit 120 may include a penetrating portion penetrating the mask unit 110 and a connection pipe connecting the penetrating portion to the outside.

The valve unit 130 is configured to open and close the ventilation unit 120 and may have a valve shape configured to open and close the inside of the ventilation unit 120 formed to pass through one side of the mask unit 110 . The valve unit 130 may be installed in the penetrating part or in a part of the connecting pipe, and may be controlled by a VR device (200 in FIG. 1) or a control unit included in the VR device (200 in FIG. 1).

According to FIG. 2(b), a ball pool 300 according to the present invention may have a predetermined area, a predetermined depth, and a predetermined shape. The ball pool 300 is intended to provide a situation similar to a situation in which a user floats or sinks in water, and the VR device (200 in FIG. 1) according to the present invention uses a camera module (hereinafter, an external recognition unit 210). It is possible to recognize the ball pool 300 or a wall surface of the ball pool 300 to create a reference line, and provide a virtual reality screen based on the created reference line. That is, the ball pool 300 may have a size and shape corresponding to a virtual reality screen.

3 schematically shows a VR device according to the present invention.

According to FIG. 3, the VR device 200 according to the present invention includes an external recognition unit 210, which is a camera module for capturing the outside, a sensing unit 220 for detecting a user's movement, and the VR device 200. It may include a control unit 230 for controlling the respiration control device (100 in FIG. 1) as well as controlling the configured components.

The external recognition unit 210 is for capturing the external situation of the VR device 200 according to the direction of the user's gaze when it is necessary to recognize the outside even when the user wears the VR device 200, and the VR device 200 may provide the image data generated by the external recognition unit 210 to the user as a screen.

The sensing unit 220 may detect the user's movement using an acceleration sensor and also detect the current tilt state of the user using a tilt sensor. Specifically, when the user lies down in the ball pool 300, the direction of the user's gaze and the inclination of the head may be detected. That is, the sensing unit 220 may include an acceleration sensor and/or a tilt sensor.

In addition, the sensing unit 220 may further include a respiration sensor installed inside the mask unit (110 in FIG. 2 ) to measure the respiration of the user. The respiration sensor is for measuring a user's inhalation and exhalation pattern. Data measured by the respiration sensor may be transmitted to the controller 230 .

The control unit 230 may configure the image data generated by the external recognition unit 210 as screen data and provide it to the user. Also, the controller 230 may receive sensing data from the sensing unit 220 and provide virtual screen data based on the sensing data. For example, if it is detected that the user moves in the left direction, the controller 230 may change and provide a virtual reality screen in the direction of the user's movement, which can utilize conventional technology as it is.

In addition, the controller 230 controls the valve unit (130 in FIG. 2) of the breathing control device (100 in FIG. 1) to open the ventilation unit 120 only when the tilt information detected by the tilt sensor is within a preset range. can do. Conversely, the control unit 230 controls the valve unit (130 in FIG. 2) of the breathing control device (100 in FIG. 1) to close the ventilation unit 120 when the erase information detected from the tilt sensor is outside the preset range can do.

In addition, the controller 230 controls the valve unit (130 in FIG. 2 ) in a closed state when providing a virtual reality screen according to the first scenario, and when providing a virtual reality screen according to the second scenario, the valve unit ( 130 of FIG. 2) may be controlled to be in an open state. In this case, the first scenario may be a scenario in which the user falls into the water, and the second scenario may be a scenario in which the user raises his/her face above the water after falling into the water.

For example, when a virtual reality screen according to the first scenario for a situation in which the user is drowning is provided to the user through the VR device 200, the controller 230 controls the valve unit (130 in FIG. 2 ) to control respiration. The ventilation unit 120 of the device ( 100 in FIG. 1 ) may be closed. As a result, the user's breathing is controlled so that the user can feel similar to a situation in which he or she is drowning.

For example, when a virtual reality screen according to the second scenario for a situation in which the user exposes his/her face out of the water in the water is provided to the user through the VR device 200, the control unit 230 controls the breathing control device (100 in FIG. 1 ). The valve unit ( 130 in FIG. 2 ) may be controlled to open the ventilation unit 120 of ). In order to realize the second scenario, after the virtual reality screen according to the first scenario is provided, an angle within a predetermined range must be measured from the tilt sensor.

That is, survival swimming is a swimming method using the fact that the face is exposed out of the water when the head is tilted back and relaxed in the water.

Control unit 230 may obtain the user's breathing pattern information from the breathing sensor. The controller 230 may detect whether or not the user is in a state of tension through breathing pattern information. When the user is classified as being in an excessive tension state, the controller 230 may control the valve unit ( 130 of FIG. 2 ) to open the ventilation unit 120 .

In particular, in the case of users who have water phobia or trauma about going into water, even if they use the VR device 200, they may be in a state of excessive tension. A user's state of tension may be detected using a respiration sensor.

4 schematically shows a control unit according to the present invention.

According to FIG. 4 , the controller 230 according to the present invention may include a processor, a memory and a communication module.

The processor 231 may execute commands stored in the memory 232 to control other components. The processor 231 may execute instructions stored in the memory 232 .

The processor 231 is a component capable of performing calculations and controlling other devices. Mainly, it may mean a central processing unit (CPU), an application processor (AP), a graphics processing unit (GPU), and the like. Also, the CPU, AP, or GPU may include one or more cores therein, and the CPU, AP, or GPU may operate using an operating voltage and a clock signal. However, while a CPU or AP consists of a few cores optimized for serial processing, a GPU may consist of thousands of smaller and more efficient cores designed for parallel processing.

The processor 231 may provide or process appropriate information or functions to a user by processing signals, data, information, etc. input or output through the components described above or by running an application program stored in the memory 232.

The memory 232 stores data supporting various functions of the controller 230 . The memory 232 may store a plurality of application programs (applications) driven by the control unit 230, data for operation of the control unit 230, and commands. At least some of these application programs may be downloaded from an external server through wireless communication. In addition, the application program may be stored in the memory 232, installed in the control unit 230, and driven by the processor 231 to perform the operation (or function) of the control unit 230.

The memory 232 may be a flash memory type, a hard disk type, a solid state disk type, a silicon disk drive type, or a multimedia card micro type. ), card-type memory (eg SD or XD memory, etc.), RAM (random access memory; RAM), SRAM (static random access memory), ROM (read-only memory; ROM), EEPROM (electrically erasable programmable read -only memory), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and an optical disk. Also, the memory 232 may include a web storage performing a storage function on the Internet.

The communication module 233 transmits and receives information with a base station or a camera having a communication function through an antenna. The communication module 233 may include a modulation unit, a demodulation unit, a signal processing unit, and the like. Also, the communication module 233 may perform a wired communication function.

Wireless communication may refer to communication using a wireless communication network using a communication facility previously installed by telecommunication companies and a frequency of the communication facility. At this time, the communication module 233 is code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple (SC-FDMA) access), and the like, as well as the communication module 233 can also be used for 3rd generation partnership project (3GPP) long term evolution (LTE). In addition, not only 5G communication, which is currently being commercialized, but also 6G, which is scheduled to be commercialized later, can be used. However, the present specification may utilize a pre-installed communication network without being bound by such a wireless communication method.

In addition, as a short range communication technology, Bluetooth, BLE (Bluetooth Low Energy), Beacon, RFID (Radio Frequency Identification), NFC (Near Field Communication), infrared communication (Infrared Data Association; IrDA) ), UWB (Ultra Wideband), ZigBee, etc. may be used.

According to FIG. 4 , the controller 230 according to the present invention may further include a vision recognition module 234 . The vision recognition module 234 according to the present invention may be configured to automatically recognize a wall surface of the ball pool (300 in FIG. 1 ) from image data generated by the external recognition unit 210 . The vision recognition module 234 may automatically recognize a wall of the ball pool (300 in FIG. 1 ) from image data and provide a virtual reality screen based on the recognized wall. For example, the VR device 200 may provide a virtual reality screen that replaces the inside of a wall recognized by the vision recognition module 234 with a swimming pool. The vision recognition module 234 may automatically recognize the wall of the ball pool (300 in FIG. 1) through a CNN algorithm.

5 is a diagram showing an example of an image correction filter according to the present invention, and FIG. 8 shows a HSV graph according to the present invention.

According to Figure 7, the type and function of the filter is shown. That is, the CNN algorithm may be a learning algorithm using a plurality of layers. In addition, the CNN algorithm can automatically learn a filter that maximizes image classification accuracy, and by adding a new layer called a convolutional layer and a polling layer before the fully connected layer, after applying the filtering technique to the original image, the filtered image A classification operation can be performed on . The CNN algorithm is configured to apply a filtering technique to the original image by adding a new layer, called a convolutional layer and a pooling layer, before the fully-connected layer, and then perform a classification operation on the filtered image. can

At this time, the operation expression for the image filter using the CNN algorithm is as shown in Equation 1 below.

[Equation 1]

(step,

: 행렬로 표현된 필터링된 이미지의 i번째 행, j번째 열의 픽셀,

: pixels in the i-th row and j-th column of the filtered image expressed as a matrix,

: 필터,

: filter,

: 이미지,

: image,

: 필터의 높이 (행의 수),

: height of the filter (number of rows),

: 필터의 너비 (열의 수)이다. )

: The width of the filter (number of columns). )

Preferably, the operation expression for the image filter using the CNN algorithm is as shown in Equation 2 below.

[Equation 2]

(step,

: 행렬로 표현된 필터링된 이미지의 i번째 행, j번째 열의 픽셀,

: pixels in the i-th row and j-th column of the filtered image expressed as a matrix,

: 응용 필터

: Application filter

: 이미지,

: image,

: 응용 필터의 높이 (행의 수),

: height of application filter (number of rows),

: 응용 필터의 너비 (열의 수)이다.)

: The width (number of columns) of the application filter.)

는 응용 필터로서 볼 풀(도 1의 300)이 포함된 영상 데이터를 학습하고, 영상 데이터에 포함된 볼 풀(도 1의 300)의 벽면을 인식하기 위하여, 상기 이미지 데이터에 적용되는 필터일 수 있다. 특히, 볼 풀(도 1의 300)의 벽면과 같이 주변과 타겟의 경계면에 대한 인식의 경우 형태 및 색감의 차이를 기초로 분류될 수 있으므로, 형태 및 색감 등을 효과적으로 인지하기 위한 응용 필터가 필요할 수 있다. 이러한 필요성을 충족하기 위하여 응용 필터

는 아래의 수학식 3에 의하여 연산될 수 있다. Preferably,

may be a filter applied to the image data in order to learn image data including a ball pool (300 in FIG. 1) as an application filter and recognize a wall surface of the ball pool (300 in FIG. 1) included in the image data. there is. In particular, in the case of recognition of the interface between the surroundings and the target, such as the wall of a ball pool (300 in FIG. 1), it can be classified based on the difference in shape and color, so an application filter for effectively recognizing shape and color is required. can Application filters to meet these needs

Can be calculated by Equation 3 below.

[Equation 3]

: 필터,

: 계수,

: 응용 필터)(step,

: filter,

: Coefficient,

: application filter)

에 따른 필터는 도 5에 따른 엣지 인식 필터(Edge detection), 샤픈 필터(sharpen) 및 박스 블러 필터(Box blur) 중 어느 하나의 행렬일 수 있다. At this time, each

The filter according to may be a matrix of any one of an edge detection filter according to FIG. 5, a sharpen filter, and a box blur filter.

를 구하는 연산식은 아래의 수학식 4와 같다. 이때,

는 필터의 효율을 높이기 위하여 사용되는 하나의 변수로서 해석될 수 있으며, 그 단위는 무시될 수 있다. Preferably,

The operation expression for obtaining is as shown in Equation 4 below. At this time,

can be interpreted as a variable used to increase the efficiency of the filter, and its unit can be ignored.

[Equation 4]

However, the diameter (diameter) of the lens of the camera module of the external recognition unit (210 in FIG. 3) used for image capture is in mm, the f-value of the lens is the aperture value (F number) of the lens, and the HSV average value is the image It may mean a value obtained by averaging values obtained by converting color coordinates according to HSV into size values through the HSV graph. Details of the HSV value are as follows.

According to FIG. 6 , the HSV graph according to the present invention may mean a color space in which perceptual characteristics are reflected. H (Hue, 0 to 360°) may mean hue, S (Saturation, 0 to 100%) may mean saturation, and V (Value, 0 to 100%) may mean lightness. . Hue, saturation, and lightness values can be referred to as HSV values, which can be easily extracted using graphic tools such as Adobe illustrator cc 2019.

The HSV average value according to the present invention can be obtained through the HSV three-dimensional coordinates of FIG. 6 . That is, the average HSV value according to the present invention may be calculated based on the HSV value obtained through a graphic tool. The distance value of the HSV coordinates measured with the origin coordinates on the HSV 3-dimensional coordinates as a reference point may constitute the above-described HSV average value. That is, the image according to the present invention includes an image of a ball pool (300 in FIG. 1), and the HSV color coordinates of the image may be distributed in a certain area among HSV three-dimensional coordinates. Therefore, the HSV average value according to the present invention may mean a distance value from the origin coordinates calculated based on average coordinates using the average of HSV coordinates for colors of a certain region.

[Experimental example]

Regarding the image data according to the present invention, in the case of applying the application filter F' of the present invention, the recognition accuracy of the boundary surface such as the wall of the ball pool (300 in FIG. 1) in the image is as follows. The table below shows the accuracy of the recognition result as a numerical value, depending on whether a filter is applied or not, commissioned by 10 experts in the relevant technical field.

no filter applied

적용filter

apply filter

apply Average Accuracy (Score) 75 90 97

Table 5 shows the scores for accuracy evaluated by experts for each case. In this experimental example, the accuracy of the learning module pre-learned through big data was investigated according to whether or not a filter was applied.

In addition, this experimental example was experimented with image data including 120 types of ball pools (300 in FIG. 1), and for the recognition result value, on the wall of the ball pool (300 in FIG. 1) included in the image data. The accuracy of the perception of is surveyed by 10 experts.

As can be seen in Table 5, when the filter is not applied, there is a probability of error in image recognition, and the evaluation is relatively low accuracy. In contrast, the accuracy was slightly higher when the general CNN filter F was applied, but it was confirmed that the accuracy was remarkably improved when the applied filter F' was applied.

7 schematically shows an external recognition unit according to the present invention.

According to FIG. 7 , the external recognition unit 210 according to the present invention is a kind of camera module and can generate image data from an optical image. The external recognition unit 210 may include a housing including a through hole on a side wall, a lens 1321 installed in the through hole, and a driving unit 1323 that drives the lens 1321 . The through hole may have a size corresponding to the diameter of the lens 1321 . The lens 1321 may be inserted into the through hole.

The driving unit 1323 may be configured to control the lens 1321 to move forward or backward. The lens 1321 and the driving unit 1323 are connected in a conventionally known manner, and the lens 1321 may be controlled by the driving unit 1323 in a conventionally known manner.

In order to obtain various video images, the lens 1321 needs to be exposed to the outside of the external recognition unit 210 or the housing.

In particular, since the external recognition unit 210 according to the present invention needs to directly photograph the outside, a lens with strong contamination resistance in the external environment is required. Accordingly, the present invention proposes a coating layer for coating a lens to solve this problem.

Preferably, the surface of the lens 1321 may be coated with a coating composition including a compound represented by Chemical Formula 1 below, an organic solvent, inorganic particles, and a dispersant.

[Formula 1]

here,

L ₁ is a single bond, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, substituted or unsubstituted is selected from the group consisting of an alkenylene group having 2 to 20 carbon atoms, a substituted or unsubstituted cycloalkenylene group having 3 to 20 carbon atoms, and a substituted or unsubstituted alkynylene group having 2 to 20 carbon atoms,

When the L ₁ is substituted, hydrogen, a nitro group, a halogen group, a hydroxy group, an alkyl group having 1 to 30 carbon atoms, a cycloalkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 24 carbon atoms, and a carbon number It is substituted with one or more substituents selected from the group consisting of an aralkyl group having 7 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, and an alkoxy group having 1 to 30 carbon atoms, and when substituted with a plurality of substituents, they are the same as or different from each other.

When the lens 1321 is coated with the coating composition, it can exhibit excellent water repellency and stain resistance, so even if the lens 1321 installed near the road is exposed to a polluted environment for a long time, clearer images or videos can be collected.

The inorganic particles may be selected from the group consisting of silica, alumina, and mixtures thereof. The average diameter of the inorganic particles is 70 to 100 μm, but is not limited to the above examples. After the inorganic particles are formed as the coating layer 1322 on the surface of the lens 1321, physical strength may be improved and moldability may be increased by maintaining the viscosity within a certain range.

The organic solvent is selected from the group consisting of methyl ethyl ketone (MEK), toluene, and mixtures thereof, and preferably methyl ethyl ketone may be used, but is not limited to the above examples.

As the dispersing agent, a polyester-based dispersing agent may be used, and specifically, TEGO-Disperse 670 (manufacturer : EVONIK) can be used, but it is not limited to the above examples, and all dispersants obvious to those skilled in the art can be used without limitation.

The coating composition may further include a stabilizer as other additives, and the stabilizer may include a UV absorber, an antioxidant, and the like, but is not limited to the above examples and may be used without limitation.

A coating composition for forming the coating layer 1322 may include, more specifically, the compound represented by Chemical Formula 1, an organic solvent, inorganic particles, and a dispersant.

The coating composition may include 40 to 60 parts by weight of the compound represented by Chemical Formula 1, 20 to 40 parts by weight of inorganic particles, and 5 to 15 parts by weight of a dispersant, based on 100 parts by weight of the organic solvent. In the case of the above range, a synergistic effect is expressed to the extent that the water repellency effect due to the interaction of each component is of critical significance, and when it is out of the above range, the synergistic effect is rapidly reduced or almost nonexistent.

More preferably, the viscosity of the coating composition is 1500 to 1800 cP, and when the viscosity is less than 1500 cP, when applied to the surface of the lens 1321, there is a problem that it is not easy to form the coating layer 1322 because it flows down, and the coating composition exceeds 1800 cP. In this case, there is a problem in that it is not easy to form a uniform coating layer 1322.

[Preparation Example 1: Preparation of coating layer]

1. Preparation of coating composition

A coating composition was prepared by mixing a compound represented by Formula 1, inorganic particles, and a dispersant in methyl ethyl ketone:

[Formula 1]

here,

L ₁ is an unsubstituted alkylene group having 5 carbon atoms.

A more specific composition of the antistatic composition is shown in Table 1 below.

TX1 TX2 TX3 TX4 TX5 organic solvent 100 100 100 100 100 Compound represented by Formula 1 30 40 50 60 70 inorganic particles 10 20 30 40 50 dispersant One 5 10 15 20

(unit weight parts)

2. Preparation of coating layer

A coating layer 1322 was formed by applying the coating composition of DX1 to DX5 on one surface of the lens 1321 and then curing the coating composition.

[Experimental example]

1. Evaluation of surface appearance

Due to the difference in viscosity of the coating composition, after the coating layer 1322 was prepared, a sensory evaluation was performed on whether a uniform surface was formed. Evaluation was conducted on whether or not a uniform coating layer 1322 was formed, and the evaluation was conducted according to the following criteria.

○: uniform coating layer formation

×: Formation of non-uniform coating layer

TX1 TX2 TX3 TX4 TX5 sensory evaluation Х ○ ○ ○ Х

When forming the coating layer 1322, if the viscosity is less than a certain amount, flow occurs on the surface of the lens 1321, and it is difficult to form a uniform coating layer 1322 after the curing process in many cases. Accordingly, a problem of lowering the production yield may occur. In addition, even when the viscosity is too high, it is difficult to uniformly apply the composition, and it is impossible to form a uniform coating layer 1322.

2. Measurement of water repellency angle

After forming the coating layer 1322 on the surface of the lens 1321, the results of measuring the water repellency angle are shown in Table 3 below.

)advancing contact angle (

) static contact angle (

) receding contact angle (

) TX1 117.1±2.9 112.1±4.1 < 10 TX2 132.4±1.5 131.5±2.7 141.7±3.4 TX3 138.9±3.0 138.9±2.7 139.8±3.7 TX4 136.9±2.0 135.6±2.6 140.4±3.4 TX5 116.9±0.7 115.4±3.0 < 10

As shown in Table 3, after the coating layer 1322 was formed using the coating compositions of TX1 to TX5, the result of measuring the contact angle was confirmed. TX1 and TX5 measured receding contact angles less than 10 degrees. That is, it was confirmed that a phenomenon in which water droplets are pinned occurs when the coating composition is out of the optimal range for preparing the coating composition. On the other hand, it was confirmed that the pinning phenomenon did not occur in TX2 to 4, indicating that excellent waterproofing effect could be exhibited.

3. Fouling resistance evaluation

A lens 1321 having a coating layer 1322 according to the above embodiment formed outside the facility was attached to a model camera and exposed to an outdoor environment for 4 days. As a comparative example (Con), the same lens 1321 without the coating layer 1322 was used, and in each example, a model camera was attached to an adjacent location in the same outdoor environment.

After that, the degree of contamination of the lens 1321 before and after the experiment was evaluated, and for objective comparison, the result was compared with the comparative example in which the coating layer 1322 was not formed, and the result was evaluated by an index of 1 to 10, and Table 4 below shown in In the index below, the lower the number, the better the stain resistance.

Con TX1 TX2 TX3 TX4 TX5 stain resistance 10 7 3 3 3 8

(Unit: index) Referring to Table 4 above, in the case of forming the coating layer 1322 on the lens 1321, even if the lens 1321 is exposed to the outside while installing the camera in the external environment, analysis of high contamination resistance for a long period of time It can be seen that image data can be collected in a form that is easy to do. In particular, in the case of TX2 to TX4, it can be confirmed that the contamination resistance by the coating layer 1322 is very excellent.

The above-described present invention can be modeled as a computer readable code on a medium on which a program is recorded. The computer-readable medium includes all types of recording devices in which data readable by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. , and also includes those modeled in the form of carrier waves (eg, transmission over the Internet). Accordingly, the above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of this specification should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of this specification are included in the scope of this specification.

Any or other embodiments of the present invention described above are not mutually exclusive or distinct. Certain or other embodiments of the present invention described above may be used in combination or combination of respective configurations or functions.

The above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

100: breathing control device
200: VR device
300: ball pool

Claims (7)

a VR device for providing a virtual reality screen; and
A breathing control device controlled by the VR device; including,
The breathing control device,
a mask unit in close contact with the user's face;
a ventilation unit for ventilation of the inside and outside of the mask unit; and
A valve unit configured to open and close the ventilation unit; including,
The valve unit is controlled by the VR device, and
A ball pool having a size corresponding to the virtual reality screen; and
The VR device,
an external recognition unit for generating external image data according to the user's gaze direction; and a control unit
The control unit further includes a vision recognition module,
The vision recognition module automatically recognizes the wall of the ball pool from the image data generated by the external recognition unit,
Providing a virtual reality screen based on the recognized wall surface;
The vision recognition module is to which an image filter according to [Equation 2] is applied
Survival swimming training system using virtual reality.
[Equation 2]

(step,

: pixels in the i-th row and j-th column of the filtered image expressed as a matrix,

: Calculated by Equation 3 below as an application filter

: image,

: height of application filter (number of rows),

: The width (number of columns) of the application filter.)
[Equation 3]

(step,

: filter,

: Calculated by Equation 4 below as a coefficient,

: application filter)
[Equation 4]

According to claim 1,
The VR device,
Controlling the valve unit in a closed state when providing a virtual reality screen according to a first scenario;
Controlling the valve unit in an open state when providing a virtual reality screen according to the second scenario,
Survival swimming training system using virtual reality.
According to claim 2,
The first scenario is a scenario in which the user falls into the water,
The second scenario is a scenario for a situation in which the user's face is exposed above the water after falling into the water,
Survival swimming training system using virtual reality.
According to claim 2,
The VR device includes a tilt sensor,
The VR device provides a virtual reality screen according to the second scenario when the value measured by the tilt sensor is within a preset range,
Survival swimming training system using virtual reality.
delete According to claim 1,
The mask part further comprises a respiration sensor for measuring respiration therein,
The VR device,
A controller for controlling the valve unit and receiving respiratory data measured from the respiration sensor; further comprising,
Survival swimming training system using virtual reality.
delete

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