KR20160140060A - Water quality monitoring system and monitoring method of water quality using the water quality monitoring system - Google Patents
Water quality monitoring system and monitoring method of water quality using the water quality monitoring system Download PDFInfo
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- KR20160140060A KR20160140060A KR1020150076162A KR20150076162A KR20160140060A KR 20160140060 A KR20160140060 A KR 20160140060A KR 1020150076162 A KR1020150076162 A KR 1020150076162A KR 20150076162 A KR20150076162 A KR 20150076162A KR 20160140060 A KR20160140060 A KR 20160140060A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 191
- 238000012544 monitoring process Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 87
- 238000011156 evaluation Methods 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 46
- 238000004040 coloring Methods 0.000 claims description 33
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 21
- 239000000460 chlorine Substances 0.000 claims description 21
- 229910052801 chlorine Inorganic materials 0.000 claims description 21
- 229910019142 PO4 Inorganic materials 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 8
- 239000010452 phosphate Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 239000013535 sea water Substances 0.000 claims description 5
- 241000195493 Cryptophyta Species 0.000 claims description 4
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000013505 freshwater Substances 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- IBIRZFNPWYRWOG-UHFFFAOYSA-N phosphane;phosphoric acid Chemical compound P.OP(O)(O)=O IBIRZFNPWYRWOG-UHFFFAOYSA-N 0.000 description 11
- 238000013441 quality evaluation Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000010561 standard procedure Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000000540 analysis of variance Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000004737 colorimetric analysis Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000001303 quality assessment method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1813—Specific cations in water, e.g. heavy metals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1826—Organic contamination in water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/188—Determining the state of nitrification
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
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- Biomedical Technology (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The present invention relates to a water quality monitoring system and a water quality monitoring method using the water quality monitoring system. The water quality monitoring system includes a reaction unit that receives color change material that changes color by reacting with water to be measured and water to be measured, (R), green (G), and blue (B), respectively, when a color changes due to a reaction between a measured water and a color change material in a reaction part in a reaction part And current values of the respective wavelengths of red, green and blue, which are connected to the current converting unit, are applied to the evaluation function for each water quality item and converted into evaluation values An evaluation numerical value conversion unit, and an output unit connected to the evaluation numerical value conversion unit to display the water quality item and the evaluation value.
Description
The present invention relates to a water quality monitoring system and a water quality monitoring method using the water quality monitoring system. More particularly, the present invention relates to a water quality monitoring system and a method for monitoring water quality such as seawater, acidic or alkaline wastewater having high corrosiveness.
In water quality analysis, water quality measurement items such as existence of organic substances, nutrients, heavy metals, etc. are examined to determine suitability according to the degree of pollution and purpose of use. Recently, various types of water quality analysis systems have been developed. This water quality analysis system requires several kinds of measuring instruments and sensors. Sensors used to analyze water quality include electrolytic sensors and optical sensors.
On the other hand, existing electrolytic sensors and optical sensors are bulky and expensive, and since only the samples to be sampled are analyzed after sampling, it is difficult to measure in real time.
In the case of seawater containing a large amount of salinity, acidic acid and alkaline wastewater which are highly corrosive, there is a possibility of damage in the case of a sensor which is directly injected into water to be measured directly by injecting into a sample. Measurement of water quality using optical is also being developed, but most of them are measured through the transmittance at the emission value of a specific nano meter. Therefore, according to the quality of the water, there is a limitation in that a large amount of light emitting source and a large amount of light absorbing source have.
In order to solve the above problems, it is an object of the present invention to provide a colorimetric method and a colorimetric colorimetric method using a specific coloring material suitable for each water quality measurement item, And to provide a water quality monitoring system for measuring water quality.
Another object of the present invention is to provide a water quality monitoring method using the water quality monitoring system.
A water quality monitoring system for an object of the present invention includes a reaction part for receiving a color change material which changes color by reacting with a water to be measured and the water to be measured, a white light source for supplying white light to the reaction part, (G), and blue (B), respectively, when the color of the reaction portion changes due to the reaction between the measured water and the color-changing substance, And current values for respective wavelengths of red, green, and blue, which are supplied from the current conversion unit, are applied to an evaluation function for each water quality item and converted into evaluation values And an output unit connected to the evaluation numerical conversion unit and displaying the water quality item and the evaluation value.
In one embodiment, the water quality monitoring system may further include a measured water supply unit connected to the reaction unit to supply the measured water to the reaction unit, and a coloring material supply unit connected to the reaction unit and supplying the coloring material to the reaction unit And the like.
In one embodiment, the water quality monitoring system may further include a measured water supply unit connected to the reaction unit to supply the measured water to the reaction unit, and a measured water supply unit connected to the reaction unit, And may further include a providing section.
In one embodiment, the water quality monitoring system may further include a controller connected to the reaction unit to select a coloring material according to the quality of the water to be measured and provide the selected coloring material to the reaction unit.
In one embodiment, the quality of the water to be measured is one of phosphate, residual chlorine, nitrate nitrogen, COD (chemical oxygen demand) and algae, and the evaluation value of the water quality item is the concentration number have.
In one embodiment, the white light source may be a light emitting diode (LED).
In one embodiment, the measured water may be any one of raw water, seawater, fresh water, ground water, treated water, tap water, river water, lake water, reservoir water, acid solution and alkali solution.
Another object of the present invention is to provide a method for monitoring water quality, comprising the steps of: supplying a water to be measured and a coloring material to a reaction unit; reacting the water to be measured and the coloring material in the reaction unit; (R), green (G), and blue (B) by providing a white light to the reaction part whose color has changed due to the reaction and converting the color reflected from the reaction part into a current value for each wavelength of red And a blue current value for each wavelength, to an evaluation function for each water quality item, and converting the water quality item and the evaluation value to an output unit.
In one embodiment, the step of supplying the coloring material in the water quality monitoring method may include selecting a coloring material in accordance with the quality of water of the measured water, and supplying the selected coloring material to the reaction part.
According to the water quality monitoring system and the water quality monitoring method using the water quality monitoring system of the present invention, a color change is induced using an appropriate coloring material suitable for a water quality item and converted into an electric current and converted into an evaluation value, Information can be provided. In addition, since the water quality monitoring system can evaluate the water quality without including a separate sensor, problems such as damage or deterioration of the sensor can be prevented at its source, and it can be used economically and stably.
1 is a conceptual diagram for explaining a water quality monitoring system according to an embodiment of the present invention.
2 is a flowchart illustrating a method for monitoring water quality according to an embodiment of the present invention.
FIG. 3 is a graph for comparing the result of water quality assessment of free residual chlorine using the water quality monitoring system according to the present invention and the results obtained by the water quality test method.
4 is a graph for comparing the results of the water quality evaluation of phosphate-phosphorus (PO 4 -P) and the results of the water quality test using the water quality monitoring system according to the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "having ", etc. is intended to specify that there is a feature, step, operation, element, part or combination thereof described in the specification, , &Quot; an ", " an ", " an "
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
Water quality monitoring system
1 is a conceptual diagram for explaining a water quality monitoring system according to an embodiment of the present invention.
Referring to FIG. 1, the water
The
The
The evaluation
The quality of the water to be measured may be phosphate, residual chlorine, nitrate nitrogen, COD (chemical oxygen demand), algae, and the like. At this time, the evaluation value of the water quality item may be a concentration, and the unit may be mg / L or ppm.
For example, when the water quality item is free chlorine, the evaluation function is expressed by the following equation 1, and the evaluation value may be the concentration (unit: mg / L).
<Formula 1>
Free residual chlorine = 523 + 109 log G - 644 log B + 0.513 B 2
In the above formula (1), G is the current value of the green color wavelength band in the color represented by the reaction portion, and B is the current value of the blue color wavelength band in the color represented by the reaction portion.
For example, when the water quality item is phosphate-phosphorus (PO 4 -P), the evaluation function is represented by the following formula 2, and the evaluation value may be the concentration (unit, mg / L).
<Formula 2>
PO 4 - P = 2.67 - 0.213 R + 0.243 G - 0.26 B
In the formula 2, R is the current value of the red color wavelength band in the color represented by the reaction portion, G is the current value of the green color wavelength band in the color represented by the reaction portion, and B is the current value of the blue color wavelength band in the color represented by the reaction portion.
The
The water
The measured water supply unit may be connected to the
The
In addition, the water
The
Hereinafter, a water quality monitoring method according to an embodiment of the present invention will be described with reference to FIG. 2 together with FIG.
Water quality monitoring method
2 is a flowchart illustrating a method for monitoring water quality according to an embodiment of the present invention.
Referring to FIG. 2 together with FIG. 1, the measured water and the discoloring material are supplied to the reaction part 110 (step S210).
The
(R), green (G), and blue (B) colors by providing white light to the
The current values of the respective wavelengths of red, green and blue are applied to the evaluation function for each water quality item and converted into evaluation values (step S240).
The water quality item and the evaluation value are displayed on the output unit 160 (step S250).
Meanwhile, in the step of supplying the coloring material to the
The water
Hereinafter, the case where the water quality item is free residual chlorine will be described in detail, and the results of evaluating free residual chlorine in the water to be measured in accordance with the water quality monitoring system according to the present invention will be described.
Free residual chlorine evaluation
In order to evaluate free residual chlorine in the water to be measured, a water monitoring apparatus substantially the same as that described in Fig. 1 was prepared, and the water to be measured and the discoloring substance were supplied to the reaction section for reaction. Then, the white LED was irradiated by the current converter connected to the reaction part and the white light source, and the reflected color was converted into a current value for each wavelength of red (R), green (G) and blue (B). In the evaluation numerical conversion section, current values of respective wavelengths of red, green, and blue provided in the current switching section were applied to the free residual chlorine evaluation function and converted into evaluation values. At this time, the free residual chlorine evaluation function was calculated as shown in the following Equation (1).
<Formula 1>
Free residual chlorine = 523 + 109 log G - 644 log B + 0.513 B 2
In addition, the evaluation numerical result (((calculated free residual chlorine (mg / L)) and the result obtained by the water quality process test method (Standard Methods free residual chlorine (mg / L) 2>.
(SE Coef)
Free residual chlorine (mg / L)
As shown in Table 2, it can be seen that the R-Sq value shows a high correlation coefficient of 99.5%, and it can be confirmed that the water quality evaluation system of the water quality monitoring system according to the present invention is highly accurate.
Analysis of Variance
Reliability assessment of system analysis results
FIG. 3 is a graph for comparing the result of water quality assessment of free residual chlorine using the water quality monitoring system according to the present invention and the results obtained by the water quality test method.
In FIG. 3, the x-axis shows the concentration value (unit: mg / L), which is the result value using the water quality monitoring, and the y-axis, the resultant value of the residual chlorine concentration (unit: mg / L).
Referring to FIG. 3, it can be seen that the free residual chlorine concentration value (evaluated value) using the water quality monitoring system according to the present invention is substantially similar to the free residual chlorine concentration value obtained by the water quality testing method . That is, it can be confirmed that the water quality evaluation of the water quality monitoring system according to the present invention is highly accurate.
Hereinafter, the case where the water quality item is phosphate-phosphorus (PO 4 -P) will be described in detail, and the results of evaluating the phosphate-phosphorus (PO 4 -P) of the measured water according to the water quality monitoring system according to the present invention Will be described.
Phosphate
In order to evaluate phosphate-phosphorus (PO 4 -P) in the water to be measured, a water quality monitoring apparatus substantially the same as that described in FIG. 1 was prepared, and the water to be measured and the discoloring agent were supplied to the reaction section. Then, the white LED was irradiated by the current converter connected to the reaction part and the white light source, and the reflected color was converted into a current value for each wavelength of red (R), green (G) and blue (B). In the evaluation numerical conversion section, current values of respective wavelengths of red, green, and blue provided in the current switching section were applied to the phosphate-phosphorus (PO 4 -P) evaluation function and converted into evaluation values. At this time, the phosphate-phosphorus (PO 4 -P) evaluation function was calculated as shown in Equation (2) below, and the evaluation value was expressed in units of mg / L.
<Formula 2>
PO 4 - P = 2.67 - 0.213 R + 0.243 G - 0.26 B
In addition, the evaluation numerical result ((calculate phosphate-phosphorus (PO 4 -P)) and the result obtained by the water quality process test method (Standard Method phosphate-phosphorus (PO 4 -P)) Are shown in Table 5 below.
(SE Coef)
As shown in Table 5, it can be seen that the R-Sq value shows a high correlation coefficient of 97.0%, and the accuracy of the water quality evaluation of the water quality monitoring system according to the present invention is high.
Analysis of Variance
Reliability assessment of system analysis results
4 is a graph for comparing the results of the water quality evaluation of phosphate-phosphorus (PO 4 -P) and the results of the water quality test using the water quality monitoring system according to the present invention.
In FIG. 4, the x-axis represents the concentration value (unit: mg / L), which is the resultant value using the water quality monitoring, and the y-axis represents the phosphate-phosphorus (PO 4 -P) concentration value / L).
Referring to Figure 4, a phosphate obtained by the water process test-in (PO 4 -P) on the basis of density value, phosphate using a water monitoring system according to the invention-in (PO 4 -P) density value (evaluation value ) Exhibit substantially similar values. That is, it can be confirmed that the water quality evaluation of the water quality monitoring system according to the present invention is highly accurate.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.
100: water quality monitoring system 110:
120: current conversion unit 130: evaluation numerical value conversion unit
140: output unit 150: coloring material providing unit
160:
Claims (8)
And a white light source coupled to the reaction unit to provide white light to the reaction unit, wherein when the measured water and the color change material react with each other and the color changes, (R), green (G), and blue (B), respectively;
An evaluation value conversion unit connected to the current conversion unit and applying a current value for each wavelength of red, green, and blue provided by the current conversion unit to an evaluation function for each water quality item to convert the current value into an evaluation value; And
And an output unit connected to the evaluation-value conversion unit to display a water quality item and an evaluation value,
Water quality monitoring system.
A measured water supply unit connected to the reaction unit to supply the measured water to the reaction unit; And
And a coloring material supply unit connected to the reaction unit and supplying the coloring material to the reaction unit.
Water quality monitoring system.
Further comprising a control unit connected to the reaction unit to select the coloring material according to the quality of the water to be measured and provide the selected coloring material to the reaction unit.
Water quality monitoring system.
Wherein the quality of the water to be measured is one of phosphate, residual chlorine, nitrate nitrogen, COD (chemical oxygen demand) and algae,
Characterized in that the evaluation value of the water quality item is a concentration.
Water quality monitoring system.
Characterized in that the white light source is a light emitting diode (LED)
Water quality monitoring system.
The measured number
Characterized in that it is any one of a raw water, seawater, fresh water, ground water, treated water, tap water, river water, lake water, reservoir water, acid solution,
Water quality monitoring system.
Reacting the measured water and the coloring material in the reaction unit;
The color of the color of the red (R), the green of (G), and the color of blue (B) is changed by providing white light to the reaction part in which the color changes due to the reaction between the measured water and the color- ;
Applying a current value for each of the red, green, and blue wavelengths to an evaluation function for each water quality item, and converting the current value into an evaluation value; And
Wherein the water quality item and the evaluation value are displayed as an output.
Water quality monitoring method.
The step of supplying the discoloring material
Selecting a coloring material according to the quality of the water to be measured; And
And supplying the selected coloring material to the reaction portion.
Water quality monitoring method.
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| KR1020150076162A KR20160140060A (en) | 2015-05-29 | 2015-05-29 | Water quality monitoring system and monitoring method of water quality using the water quality monitoring system |
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| KR1020150076162A KR20160140060A (en) | 2015-05-29 | 2015-05-29 | Water quality monitoring system and monitoring method of water quality using the water quality monitoring system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111539477A (en) * | 2020-04-26 | 2020-08-14 | 陈文海 | Water quality monitoring management method, device, server and readable storage medium |
| KR20220025035A (en) | 2019-08-17 | 2022-03-03 | 가부시키가이샤 사운드펀 | Speaker unit and speaker curved diaphragm |
| KR20220043189A (en) | 2019-09-17 | 2022-04-05 | 가부시키가이샤 사운드펀 | speaker unit and speaker |
| KR20240019366A (en) | 2021-07-20 | 2024-02-14 | 가부시키가이샤 사운드펀 | Speaker unit and speaker curved diaphragm |
| KR102642876B1 (en) * | 2023-08-08 | 2024-03-04 | 주식회사 이엔아이씨티 | A System and Method for Alarming of Water pollution |
-
2015
- 2015-05-29 KR KR1020150076162A patent/KR20160140060A/en not_active Application Discontinuation
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220025035A (en) | 2019-08-17 | 2022-03-03 | 가부시키가이샤 사운드펀 | Speaker unit and speaker curved diaphragm |
| KR20230169451A (en) | 2019-08-17 | 2023-12-15 | 가부시키가이샤 사운드펀 | Speaker unit and speaker |
| KR20220043189A (en) | 2019-09-17 | 2022-04-05 | 가부시키가이샤 사운드펀 | speaker unit and speaker |
| KR20240006700A (en) | 2019-09-17 | 2024-01-15 | 가부시키가이샤 사운드펀 | Speaker unit and speaker |
| CN111539477A (en) * | 2020-04-26 | 2020-08-14 | 陈文海 | Water quality monitoring management method, device, server and readable storage medium |
| CN111539477B (en) * | 2020-04-26 | 2023-06-27 | 中海云科(北京)科技有限公司 | Water quality monitoring management method, device, server and readable storage medium |
| KR20240019366A (en) | 2021-07-20 | 2024-02-14 | 가부시키가이샤 사운드펀 | Speaker unit and speaker curved diaphragm |
| KR102642876B1 (en) * | 2023-08-08 | 2024-03-04 | 주식회사 이엔아이씨티 | A System and Method for Alarming of Water pollution |
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