KR20170035730A - traffic information collecting system using mobile communication terminal - Google Patents

traffic information collecting system using mobile communication terminal Download PDF

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KR20170035730A
KR20170035730A KR1020150134991A KR20150134991A KR20170035730A KR 20170035730 A KR20170035730 A KR 20170035730A KR 1020150134991 A KR1020150134991 A KR 1020150134991A KR 20150134991 A KR20150134991 A KR 20150134991A KR 20170035730 A KR20170035730 A KR 20170035730A
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information
traffic
connection
unit
terminal
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KR1020150134991A
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Korean (ko)
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KR101723380B1 (en
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고은아
이탁수
박진우
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이탁수
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    • G06Q50/30—
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
    • G08G1/0112—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from the vehicle, e.g. floating car data [FCD]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
    • G08G1/0141—Measuring and analyzing of parameters relative to traffic conditions for specific applications for traffic information dissemination

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Engineering & Computer Science (AREA)
  • Operations Research (AREA)
  • Tourism & Hospitality (AREA)
  • Traffic Control Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a traffic information collecting system using a mobile communication terminal. The traffic information collecting system allows a traffic control center server to generate traffic information by analyzing and processing connection information which is received from a driver mobile communication terminal to be collected by a WI-FI connection device, thereby increasing collection efficiency and publicity, can reduce installation and operation cost by allowing a user to use the system without purchasing an extra terminal, allows a WI-FI collecting device to be installed in a traffic light and transmit accumulated connection information to the traffic control server through a communication interface part of a traffic light controller, thereby significantly reducing installation cost, and significantly increases the number of detected vehicles compared to the number of driving vehicles by allowing the system to be used regardless of the type of a communication company.

Description

[0001] The present invention relates to a traffic information collecting system using a mobile communication terminal,

The present invention relates to a traffic information collection system using a mobile communication terminal, and more particularly, to a traffic information collection system using a mobile communication terminal for collecting traffic information by processing connection request data transmitted from a mobile communication terminal of a driver, ≪ / RTI >

As the economy has expanded and advanced, the number of roads and vehicles has increased. As the number of roads and vehicles increases, vehicle information, which is information on vehicles driving on the road, is collected using vehicle detection means, Intelligent Transportation System (ITS), which generates and manages traffic information including vehicle density, congestion rate, vehicle speed, and offending vehicles, is widely used.

The traffic information collecting system typically includes a vehicle sensing unit that senses a vehicle traveling on a predetermined sensing section, a controller that generates vehicle information by analyzing a sensing signal transmitted from the vehicle sensing unit, And a traffic management center server for analyzing and generating real-time traffic information.

Since the conventional traffic information collection system configured as described above is configured to generate traffic information based on the sensing signals sensed by the vehicle sensing means, reliability and accuracy of the traffic information are ensured depending on how the vehicle sensing means is configured.

Conventionally, a loop coil system, a laser system, and a radar system have been widely used as vehicle detection means. However, since the loop coil system must be buried in the road surface, installation and inspection are complicated and costly. The detection range is limited and the number of vehicles to be sensed is smaller than that of the entire traveling vehicle. Therefore, the accuracy and reliability of the detection are lowered. In the case of using the radar, the detection is not performed or the error rate is high.

UTIS (Urban Traffic Information System) has been studied variously as the communication infrastructure has been expanded and the technology of digital devices has rapidly developed. Is configured to transmit driving information accumulated in a base station (RSE) connected when a road-side equipment (RSE) is connected. However, in order to drive the UTIS, an OBE and a dedicated program are separately purchased and installed The manufacturing cost is high and there is no profit for the driver. Therefore, there is a problem that the efficiency of collecting drops remarkably due to the lack of spontaneity.

FIG. 1 is a configuration diagram showing a priority signal control system disclosed in a Korean Patent Registration No. 10-2011-0107567 (entitled "Emergency Vehicle Priority Signal Control System Using Utilized Emergency Vehicles") Patented by the present applicant.

The priority signal control system (hereinafter referred to as "prior art") 100 shown in FIG. 1 includes in-vehicle terminals 101-1, ..., 101-N installed in an emergency vehicle, (Car navigation systems) 111-1, ..., 111-N connected to the UTIS network 110 (N-1), ..., ..., 103-N and base stations 103-1, ..., and 103-N that provide the base station 103-1, ..., And a local traffic center 105 for generating traffic.

The conventional technique 100 configured as described above transmits driving information to the base station 103 connected to the in-vehicle terminal 101 via the UTIS network 110 and the base station 103 transmits the driving information to the in- By transmitting the received driving information to the local traffic center 105 through the communication network, the traffic information can be generated and collected by the local traffic center 105.

However, in the conventional technology 100, since the driver must purchase the in-vehicle terminal 101 essentially and a separate navigation program must be installed in order to receive the traffic information from the local traffic center 105, In addition, there is a problem in that the efficiency of collecting is remarkably low due to the spontaneousness and publicity of the driver.

That is, in the conventional technology 100, the number of vehicles to be sensed is excessively low as compared with the total number of vehicles to be driven, so that the accuracy and reliability of the traffic information are deteriorated.

(1) excellent collection efficiency, accuracy and reliability; (2) installation and manufacturing costs are reduced; and (3) traffic information collection systems that can increase spontaneity and publicness are urgently needed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a traffic control center server which analyzes traffic information transmitted from a driver's mobile communication terminal and collects traffic information collected by a Wi- Efficiency and publicity of the vehicle, and at the same time, it is possible to use the vehicle without purchasing a separate dedicated terminal, thereby reducing installation and operation costs.

Another object of the present invention is to provide a traffic information collection system capable of remarkably reducing installation cost by transmitting connection information accumulated in a traffic control center server through a communication interface unit of a traffic light controller installed in a traffic light controller of a WiFi collecting apparatus .

Another object of the present invention is to provide a traffic information collecting system capable of significantly increasing the number of sensed vehicles compared to a traveling vehicle by enabling interworking regardless of the type of a communication company.

According to an aspect of the present invention, there is provided a traffic information collection system for collecting traffic information, the system comprising: a mobile communication terminal supporting short range wireless communication and carried by a vehicle driver; A connection device installed at a distance from the road for transmitting a short-range wireless signal; And a traffic control center server for receiving the data from the access devices and generating the traffic information. The mobile communication terminal transmits access information including identification information to the connected access device, and the traffic control center server And analyzes the connection information transmitted from the access devices to generate the traffic information.

Further, in the present invention, the traffic information collection system may further include traffic light controllers for managing and controlling pre-assigned traffic lights, wherein each of the traffic light controllers is installed in a traffic light controller, And a connection information collecting unit for receiving the connection information from the installed connection device and controlling the communication interface unit to transmit the received connection information to the traffic control center server.

Further, in the present invention, it is preferable that the connection device matches time information to the connection information.

In the present invention, it is preferable that the connection information collecting unit matches identification information of the traffic light controller to the connection information.

According to another aspect of the present invention, the traffic control center server includes a data transmission / reception unit for transmitting / receiving data to / from the traffic light controller; A filtering unit for analyzing the access information transmitted through the data transmitting and receiving unit and determining whether the terminal of the terminal identification information included in the access information is carried by a pedestrian or by a driver; And a traffic information generating unit driven when the terminal of the terminal identification information included in the connection information is determined to be a terminal carried by the driver by the filtering unit and generating traffic information by analyzing and processing the connection information Do

The traffic control center server may further include a database unit for storing connection information transmitted from the traffic light controllers, and the filtering unit searches the database unit for a predetermined period of time (T) Searching and retrieving module for searching for access information having the same terminal identification information, if the access information having the same terminal identification information is found; A detection module for detecting identification information of the traffic light controller from the connection information having the same terminal identification information extracted by the search and extraction module; A position corresponding to each of the identification information of the traffic light controller detected by the detection module is detected by using a predetermined mapping table in which the identification information of each of the traffic light controllers and the position information are matched, ) ≪ / RTI > A time difference calculation module for extracting time information from connection information having the same terminal identification information extracted by the search and extraction module and calculating a time difference? T; A speed calculating module that calculates the speed v of the sensing object by dividing the distance difference? D calculated by the distance difference calculating module by the time difference? T calculated by the time difference calculating module 356; (V) calculated by the speed calculation module is compared with a predetermined set value (TH) defined as a maximum speed at which the detection object can be determined as a pedestrian, and when the speed (v) is equal to or greater than the set value And a determination module for determining that the terminal of the terminal identification information included in the connection information is a terminal carried by the driver.

Also, in the present invention, the short-range wireless communication is preferably a Wi-Fi, and the access device transmits an open SSID (subsystem identification) Wi-Fi signal.

According to the present invention having the above-described problems and solutions, the traffic control center server transmits traffic information from the driver's mobile communication terminal and analyzes and processes access information collected by the Wi-Fi access device to generate traffic information, At the same time, it can be used without purchasing a dedicated terminal, which can reduce installation and operation costs.

According to the present invention, the WiFi collecting device is installed in the traffic light controller, and the connection information accumulated in the traffic control center server is transmitted through the communication interface of the traffic light controller, thereby significantly reducing the installation cost.

In addition, according to the present invention, interworking is possible regardless of the type of a communication company, and the number of sensed vehicles compared to a traveling vehicle can be remarkably increased.

FIG. 1 is a configuration diagram showing a priority signal control system disclosed in a Korean Patent Registration No. 10-2011-0107567 (entitled "Emergency Vehicle Priority Signal Control System Using Utilized Emergency Vehicles") Patented by the present applicant.
2 is a configuration diagram illustrating a traffic information collection system according to an embodiment of the present invention.
Fig. 3 is an exemplary view of Fig. 2. Fig.
4 is a block diagram showing the traffic light controller of Fig.
5 is a block diagram showing the Wi-Fi connection device of FIG.
FIG. 6 is a block diagram illustrating the traffic control center server of FIG. 2. FIG.
7 is a block diagram showing the filtering unit of Fig.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a configuration diagram showing a traffic information collection system, which is an embodiment of the present invention, and FIG. 3 is an exemplary view of FIG.

The traffic information collection system 1 of FIGS. 2 and 3 is a system for generating and collecting traffic information by processing and analyzing the connection information transmitted from the mobile communication terminal 3 of the vehicle driver driving the road.

The traffic information collection system 1 includes a mobile communication terminal 3 carried by a driver of a vehicle and signal lamp controllers 7-1, ..., 7-N spaced on the road, A Wi-Fi connection device 5-1 provided in each of the controllers 7-1, ..., and 7-N for receiving the connection information from the connected terminals by providing the Wi-Fi network 4, ... (5-N) through the communication interfaces of the traffic light controllers 7-1, ..., and 7-N, A traffic control center server 9 for collecting and generating traffic information by analyzing and processing connection information received from the traffic control center server 9 and traffic light controllers 7-1 to 7- And a communication network 10 for providing a data movement path with respect to the data.

The communication network 10 provides a data movement path between the traffic control center server 9 and the traffic light controllers 7-1 to 7-N connected thereto, A wired / wireless network such as a communication network (WAN), a mobile communication network, and a 3G / 4G network.

The mobile communication terminal 3 is a digital terminal for transmitting connection information to the Wi-Fi connection device 5 searched by the driver of the vehicle and is a smart phone, a personal digital assistant (PDA), a tablet PC ), A PMP (Personal Multimedia Player), a navigation device, and the like. At this time, the access information includes a MAC address of the terminal and connection request data.

The mobile communication terminal 3 includes a communication interface unit for supporting connection with a Wi-Fi network. The mobile communication terminal 3 receives a Wi-Fi signal transmitted from adjacent Wi-Fi connection devices, and transmits the Wi- . At this time, the WiFi access device provides a WiFi signal of an open SSID (service set identifier), so that the mobile communication terminal 3 can access the connected WiFi network without performing an authentication process.

The traffic light controllers 7-1, ..., and 7-N are installed on the road at intervals, and manage and control the signal lights of the pre-allocated traffic lights, the present color, and the like.

4 is a block diagram showing the traffic light controller of Fig.

The traffic light controller 7 includes a communication interface unit 71 for transmitting and receiving data to and from the traffic collection center server 9 through the communication network 10 as shown in FIG. A traffic light control unit 73 for controlling the communication interface unit 71 to collect connection information inputted from the Wi-Fi connection apparatus 5 connected to the Wi-Fi connection apparatus 5 and periodically controlling the communication interface unit 71, And a connection information collecting unit 75 which is transmitted to the traffic control center server 9.

The communication interface unit 71 supports connection with the communication network 10 and transmits and receives data to and from the traffic control center server 9.

The signal lamp control unit 73 manages and controls the signal system of each of the pre-assigned signal lamps, and more specifically includes a power supply unit for supplying power to each of the signal lamps, a control unit for processing the entire control sequence, And an operation panel unit for interfacing the operator and the machine. The configuration of the signal lamp controller is a technique used in a known signal lamp controller, and therefore, a detailed description thereof will be omitted.

The connection information collection unit 75 receives connection information from the Wi-Fi connection device 5, collects the input connection information, and matches the identification information of the signal lamp controller with the connection information.

The connection information collection unit 75 periodically controls the communication interface unit 71 to transmit the collected connection information to the traffic control center server 9. At this time, the access information is composed of the MAC address and the connection request data of the mobile communication terminal as described above, and accordingly, the traffic control center server 9 analyzes the access information transmitted from the mobile communication terminal, Information can be generated.

In the present invention, for convenience of description, the identification information of the terminal has been described as being a MAC address, but the identification information of the terminal is not limited thereto.

In addition, the MAC address information can be converted into a hash value by a hash algorithm for security and transmitted.

5 is a block diagram showing the Wi-Fi connection device of FIG.

The Wi-Fi connection device 5 is an access point (AP) for connecting the connected terminals to the Wi-Fi network 4. [

As shown in FIG. 5, the Wi-Fi connection device 5 includes a transmission unit 51 for transmitting a Wi-Fi signal, a reception unit 53 for receiving data from a connected terminal, a GPS A module unit 55 and an input unit 57 connected to the connection information collection unit 75 of the traffic light controller 7 and inputting the connection information received via the reception unit 53 to the connection information collection unit 75 .

The sending unit 51 provides a WiFi network of open SSID. At this time, when the mobile communication terminal 3 receives the Wi-Fi signal transmitted from the sending unit 51, it connects to the Wi-Fi network and transmits the connection information.

The receiving unit 53 receives the access information transmitted from the mobile communication terminal 3 connected to the Wi-Fi network. At this time, the connection information received through the receiving unit 53 is input to the connection information collection unit 75 of the traffic light controller 7 by the input unit 57 after the time information detected by the GPS unit 55 is matched.

The traffic control center server 9 analyzes and processes connection information received from the traffic light controllers 7-1, ..., 7-N to determine the number of vehicles in operation, the congestion rate, the vehicle speed, And generates traffic information such as a violation vehicle.

FIG. 6 is a block diagram illustrating the traffic control center server of FIG. 2. FIG.

The traffic control center server 9 includes a database unit 32 for storing data and a data transmitting and receiving unit 33 for transmitting and receiving data to and from the traffic light controllers 7-1 to 7- A data parsing unit 34 for storing connection information received from the traffic light controllers 7-1, ..., 7-N through the data transmitting and receiving unit 33 in the database unit 32, (7-N) through the control unit (33) to determine whether the access information corresponds to the driver of the vehicle or the pedestrian, and then the pedestrian A traffic information processing section 35 for analyzing connection information of the vehicle filtered by the filtering section 35 and processing the traffic information into traffic information including the number of vehicles driving, A controller 36 for managing and controlling the control objects 32, 33, 34, 35, 31).

The control unit 31 periodically crawls the data transmitting and receiving unit 33 and searches whether the connection information is received from the traffic light controller 7. If the connection information is searched, And the filtering unit 35, respectively.

The control unit 31 also inputs the connection information filtered by the filtering unit 35 to the traffic information generating unit 36. [

The control unit 31 also stores the traffic information generated by the traffic information generating unit 36 in the database unit 32.

Connection information received from the traffic light controller 7 and traffic information generated by the traffic information generating unit 36 are stored in the database unit 32.

In addition, the database unit 32 stores a preset value TH (Threshold). At this time, the set value is defined as the maximum speed at which the detection target can be determined as a pedestrian.

Also, in the database unit 32, the identification information of each of the traffic light controllers and the mapping table in which the location information of each of the traffic light controllers is mapped is stored in advance.

7 is a block diagram showing the filtering unit of Fig.

The filtering unit 35 of FIG. 7 analyzes the connection information to determine whether the sensing target holding the terminal is a pedestrian or a vehicle driver. If it is determined that the sensing target is a pedestrian, the filtering unit 35 removes the corresponding access information, .

7, the filtering unit 35 includes a search and extraction module 351, a detection module 353, a distance difference calculation module 355, a time difference calculation module 356, The speed calculation module 357 and the determination module 358. However, the configuration of the filtering unit 35 is not limited to this, and it is also possible that the connection information is information on the pedestrian or information on the traveling vehicle Various methods and techniques capable of distinguishing between the two types of information can be applied.

7 includes a search and extraction module 351, a detection module 353, a distance difference calculation module 355, a time difference calculation module 356, a speed calculation module 357, a determination module 358 ).

The searching and extracting module 351 searches the database 32 for a predetermined period T to search for access information having the same terminal identification information and if access information having the same terminal identification information is found, (32). At this time, the terminal identification information may be the MAC address information of the terminal or the hash value converted from the MAC address information of the terminal.

The detection module 353 detects identification information of the traffic light controller from the connection information having the same terminal identification information extracted by the search and extraction module 351. [ For example, since the vehicle passes between adjacent traffic light controllers at the time of traveling, and the mobile communication terminal transmits connection information when the traffic light is adjacent to each traffic light controller, the traffic control center server 9 has the same terminal identifier Two pieces of connection information having identification information of adjacent traffic light controllers are received.

The distance difference calculation module 355 detects a position corresponding to each of the identification information of the signal lamp controller detected by the detection module 353 using a predetermined mapping table and calculates the distance difference? D thereof .

The time difference calculation module 356 extracts the time information from the connection information having the same terminal identification information extracted by the search and extraction module 351 to calculate the time difference At.

The speed calculation module 357 divides the speed difference v of the sensing object by the time difference? T calculated by the time difference calculation module 356 by dividing the distance difference? D calculated by the distance difference calculation module 355 by .

The determination module 358 compares the velocity v calculated by the velocity calculation module 357 with a predetermined set value TH.

The determination module 358 determines that the terminal is a terminal owned by the driver if the speed v is equal to or greater than the set value TH and if the speed v is less than the set value TH, It is judged to be the terminal possessed.

At this time, the control unit 31 inputs the access information, the time difference? T, the speed? V information, and the like determined to be the terminal held by the driver by the determination module 358 to the traffic information generating unit 36, The access information determined by the determination module 358 as a terminal held by the pedestrian is not input to the traffic information generation unit 36. [

The traffic information generating unit 36 analyzes traffic information and generates traffic information.

1: traffic information collection system 3: mobile communication terminal 4: WiFi network
5: Wi-Fi access device 7: Traffic light controller
9: traffic control center server 10: communication network 31:
32: data base unit 33: data transmission / reception unit 34:
35: filtering section 36: traffic information generating section
71: communication interface unit 73: traffic light control unit 75: connection information collecting unit
351: search and extraction module 353: detection module 355: distance difference calculation module
356: time difference calculation module 357: speed calculation module 358: determination module

Claims (7)

A traffic information collection system for collecting traffic information comprising:
A mobile communication terminal supporting near field wireless communication and carried by a vehicle driver;
A connection device installed at a distance from the road for transmitting a short-range wireless signal;
And a traffic control center server for receiving the data from the connection devices and generating the traffic information,
Wherein the mobile communication terminal transmits access information including identification information to the connected access device, and the traffic control center server analyzes the access information transmitted from the access devices to generate the traffic information. Information gathering system. The traffic information collection system according to claim 1, further comprising: traffic light controllers for managing and controlling pre-assigned traffic lights,
Each of the connection devices is installed in a traffic light controller,
The traffic light controller includes a communication interface unit for transmitting and receiving data to and from the traffic control center server, a control unit for receiving connection information from the installed connection device and controlling the communication interface unit to transmit the received connection information to the traffic control center server And a traffic information collecting unit. The traffic information collection system according to claim 2, wherein the connection device matches time information to the connection information. The traffic information collection system according to claim 3, wherein the connection information collection unit matches identification information of a traffic light controller to the connection information. The method of claim 4, wherein the traffic control center server
A data transmission / reception unit for transmitting / receiving data to / from the traffic light controller;
A filtering unit for analyzing the access information transmitted through the data transmitting and receiving unit and determining whether the terminal of the terminal identification information included in the access information is carried by a pedestrian or by a driver;
And a traffic information generating unit driven when the terminal of the terminal identification information included in the connection information is determined to be a terminal carried by the driver by the filtering unit and generating traffic information by analyzing and processing the connection information Traffic information collection system. The traffic control center server according to claim 5, further comprising a database unit in which connection information received from the traffic light controllers is stored,
The filtering unit
Searching and searching the database unit for a predetermined period T to search for existence of connection information having the same terminal identification information, and searching and extracting the retrieved connection information if the connection information having the same terminal identification information is searched;
A detection module for detecting identification information of the traffic light controller from the connection information having the same terminal identification information extracted by the search and extraction module;
A position corresponding to each of the identification information of the traffic light controller detected by the detection module is detected by using a predetermined mapping table in which the identification information of each of the traffic light controllers and the position information are matched, ) ≪ / RTI >
A time difference calculation module for extracting time information from connection information having the same terminal identification information extracted by the search and extraction module and calculating a time difference? T;
A speed calculating module that calculates the speed v of the sensing object by dividing the distance difference? D calculated by the distance difference calculating module by the time difference? T calculated by the time difference calculating module 356;
(V) calculated by the speed calculation module is compared with a predetermined set value (TH) defined as a maximum speed at which the detection object can be determined as a pedestrian, and when the speed (v) is equal to or greater than the set value And a determination module for determining that the terminal of the terminal identification information included in the connection information is a terminal carried by the driver. The method of any one of claims 1 to 6, wherein the short-range wireless communication is a Wi-Fi, and the access device transmits an open SSID (subsystem identification) Wi-Fi signal.
KR1020150134991A 2015-09-23 2015-09-23 traffic information collecting system using mobile communication terminal KR101723380B1 (en)

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CN107529664A (en) * 2017-08-24 2018-01-02 南京茶非氪信息科技有限公司 A kind of traffic based on WIFI signal is passed unimpeded grade detecting system
CN107564284A (en) * 2017-08-24 2018-01-09 南京茶非氪信息科技有限公司 A kind of traffic based on WIFI signal detection is passed unimpeded grade forecast system
KR101882414B1 (en) * 2017-04-18 2018-07-26 (주)크리웨이브 Real-time traffic information generating system using beacon information
KR102294122B1 (en) * 2020-03-05 2021-08-26 도로교통공단 Digital traffic controller testing system using digital computer interface device
KR102349339B1 (en) * 2021-03-22 2022-01-07 유경학 Real-time Road Information Collection and Management Method in Network

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Publication number Priority date Publication date Assignee Title
KR101882414B1 (en) * 2017-04-18 2018-07-26 (주)크리웨이브 Real-time traffic information generating system using beacon information
CN107529664A (en) * 2017-08-24 2018-01-02 南京茶非氪信息科技有限公司 A kind of traffic based on WIFI signal is passed unimpeded grade detecting system
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KR102294122B1 (en) * 2020-03-05 2021-08-26 도로교통공단 Digital traffic controller testing system using digital computer interface device
KR102349339B1 (en) * 2021-03-22 2022-01-07 유경학 Real-time Road Information Collection and Management Method in Network

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