During the college entrance examination, the candidates will take photos of the college entrance examination math questions and upload them to the Xiaoyuan Souyu APP.
I believe everyone has been shocked by this news in the past two days.
Cause On the afternoon of June 7th, when the staff of Xiaoyuan Search Questions APP monitored the background, they found that a user searched for suspected real college entrance examination questions by taking pictures of their mobile phones. The App did not provide any search results. After the examination, the staff immediately contacted the relevant Departments report, and provide clues such as background screenshots and data to relevant departments for verification.
Subsequently, the Higher Education Examination Office of the Hubei Provincial Education Examination Institute and Huangpi Education and other institutions dealt with the incident overnight, and the Hubei Radio Management Department responded that it had formed a special class to investigate.
In an incredible shock, a series of questions emerged.
Which link went wrong?
There are three key issues:
Why can a mobile phone be brought into the examination room? Why was the shooting undetected? Why is there a signal to upload?
Industry insiders told AI Nuggets that the college entrance examination is a standardized examination room. The equipment in the standardized examination room generally includes a handheld ID card reader, a handheld metal detector, a multi-channel full-function wireless signal shielding instrument, a wireless invisible headset detector, and a standardized examination room dedicated Radio controlled clock.
According to experts, mobile phone detectors are different from mobile phone signal detectors. In addition to the fundamental channel information from the target, the mobile phone detector can also get 2 times, 3 times and higher information, regardless of whether the mobile phone is turned on or off. Both can be detected, and the main detection objects are metal junctions and PN junctions in mobile phones.
The failure to detect the mobile phone may be due to the problem of the security check process being greater than the problem of the detection equipment.
The second question is whether there is technology that can identify cheating on exams?
In fact, this year many provinces have increased technological means for the college entrance examination.
For example, in Henan this year’s college entrance examination examination rooms will implement video surveillance, full coverage without blind spots, full HD video recording, and networked monitoring throughout the province.
In the invigilation, each examination room is equipped with 3 invigilators, and every 4 examination rooms are equipped with a video invigilator. Double invigilators of the examination room and video, as well as online and offline inspections are implemented.
In the post-examination review, technical means are used to conduct a comprehensive comparison and review of candidates’ registration and entrance photos, intelligently screen the video of the examination room, introduce intelligent recognition technology into the college entrance examination online assessment paper, adopt a combination of man and machine, and strictly investigate and deal with similarities. volume.
This year’s college entrance examination in Hunan also strengthened the video surveillance of the entire examination process. All examination sites monitored and recorded the examination process through the video surveillance system. After the examination, a dedicated person was organized to centrally review the surveillance video.
It can be found that in the application of smart video technology, the above provinces are only for post-examination review.
Is there any cheating during the exam?
It is reported that many institutions have launched related products and solutions for college entrance examination scenarios.
For example, Suzhou Keda’s standardized electronic examination room online inspection and video command system technical solutions include five modules: online inspection system, video command and dispatch system, examination integrated business management system, cheating prevention and control system, and candidate identity verification system, among which there is intelligence Behavior recognition, abnormal behavior recognition and other functions.
Liu Xiangquan, general manager of Suzhou Keda Education Department, said that the college entrance examination is a typical standardized examination room, with fairness and standardization as the main goal, including postgraduate candidates, judicial examinations, accounting and other examination scenarios.
National Examination Institute, Provincial Examination Institute and other related policies stipulate that standardized examination rooms can take panoramic views of the classroom, but the sharpness must not be too high, and there must be no PTZ lenses. Focusing, lens stretching, etc. are prohibited.
“Because if the camera is zoomed in and the content of the test paper is captured, it may be recorded in the invigilation video. If you encounter network loopholes, malicious attacks or human reasons, the content of the test paper will be leaked.”
Liu Xiangquan introduced that the difficulty of intelligent behavior analysis of cheating behavior is relative, and it is more difficult for manufacturers without AI algorithms, technologies and scenarios.
Through intelligent algorithms, abnormal behaviors in the examination room can be judged. For example, someone who turns his head and looks to the left for a long time, such as turning around, standing, raising his head, lying on the table, leaving the seat, etc., can all be recognized.
In smart classrooms or smart teaching scenes, a large amount of data training is conducted based on the recording and broadcasting video of the teaching scene. If a student stands up, the camera will automatically focus, switch the recording lens, and detect whether the student is using a mobile phone.
However, in standardized scenarios, many cameras currently do not add the “recognition by taking a picture with a mobile phone” algorithm.
“Because the standardized scene does not have a mobile phone by default, in the previous data training, the behavior of holding a mobile phone was not included in the data.”
“The default mobile phone is gone before entering. Of course, if there is no such device in the examination room, or the sensitivity of the device is not enough, or for human reasons, specific problems must be analyzed in detail.”
Why not add an algorithm to identify mobile phones? Another industry insider told AI Nuggets:
The first point is that the most widely used AI, such as image recognition, language recognition, and computer vision recognition, is perceptual. The core logic is the input and output function, the logic is relatively simple, and there are many unsolved problems.
Sun Jian, chief science and technology scientist at Megvii, once told the AI Nuggets that, for example, the occlusion problem in object detection is a very cutting-edge research in computer vision. If there are two people in a photo, one person is partially occluded by the other person, although human The eyes are very easy to distinguish, but because it involves reasoning, it is a very difficult problem for computers.
The second point is that to recognize behaviors such as holding a mobile phone or taking a photo with a mobile phone, a lot of supervised training and labeling methods are required. Exam scenarios are not high-frequency scenarios. Long-tail distribution is the core problem in machine learning, that is, it is difficult to have sufficient training models for data that does not occur frequently or is not easily common, and it is difficult to train a good model with machine learning methods.
Therefore, this algorithm requires a large amount of data and model training, and artificial intelligence requires humans before they have intelligence, and only how many humans there are.
Artificial intelligence has today’s prosperity. There are thousands of data annotators quietly dedicated behind it, and some large companies have as many as tens of thousands of annotation teams. This requires huge costs.
There are 10.78 million candidates nationwide, with more than 7,200 test centers, 466,000 test rooms (including 26,000 spare isolated test rooms), and more than 1.4 million test-related staff, including more than 950,000 invigilators.
Among tens of millions of people, there is a Wu Moumou.
Who is the payer for various exam scenarios, and whether they are willing to pay high construction costs, equipment and system update and maintenance costs for one in ten million, this is a question worth thinking about.
3. Why is the signal not blocked?
A technical person from an operator said that the working principle of the wireless signal jammer is to block noise, send out meaningless signals in a specific frequency band, and suppress normal mobile phone signals.
Some experts have analyzed that it may be due to the old-style jammer or the inability to shield the 5G signal. According to the division of 5G frequency bands, 5G of China Telecom and China Unicom mainly use 100MHz spectrum resources in the 3.5GHz frequency band, while China Mobile mainly uses 160MHz spectrum resources in the 2.6GHz frequency band and 100MHz spectrum resources in the 4.9GHz frequency band.
Communication technology continues to upgrade, and the 5G signal system is different from the original 4G system. There is a possibility that the old model of interference equipment cannot completely interfere with the 5G signal.
He inferred that it may be that the 5G signal is not within the working range of the signal jammer used in the field; it may also be that the 5G signal itself has a relatively strong anti-interference ability, and the signal jammer failed to successfully suppress the interference.
Can the shielding device be bypassed if the cheating device uses the UHF band?
Liu Xiangquan told AI Nuggets:
First, the UHF is characterized by a very short wave band and poor penetration, especially in the classroom, the wall will further limit the transmission distance.
Second, UHF requires transmitters and receivers. Due to its weak penetrating power and short transmission distance, even if the signal is propagated, the outside receiver needs to be closer, which is not realistic in the college entrance examination scene.
“From 4G to 5G, and even to 6G in the future, frequency bands are getting higher and higher, and wavelengths are getting shorter and shorter. The 6G currently under research may be allowed to reach the frequency of 20G, but the transmission distance will be more limited.”
He added: “Perhaps technological advancement can be achieved in the future, but at least it is still very difficult for the moment.” After an analysis from all walks of life, the Huangpi District Admissions Office brought the latest news: or because of 5G signal shielding loopholes, As a result, the examinee can upload test questions on a mobile phone.
Are webcam glasses really achievable?
Before the official announcement, it was reported that the candidate was using high-tech cheating glasses.
This “American high-tech glasses” is actually the news of 2018.
According to reports, a small screw-like thing fell from the glasses of the candidates in the news during the exam. When asked by the invigilator, he faltered, and then learned about the cheating.
There are not many news about “high-tech glasses cheating” on the Internet, not the latest “high-tech”, there are similar reports every year.
So the question is, are the camera glasses high-tech? Can it be achieved?
Liu Xiangquan told AI Nuggets that such cheating glasses are actually similar to Google smart glasses. In the exam scenario, the successful operation of this equipment requires 2 prerequisites:
1. Wireless communication.
First of all, the front-end perception technology is not difficult to realize. Whether it is in the form of image, video or voice, many cameras and microphones on the market can achieve pinhole level, which is not easy to distinguish with the naked eye, but at the transmission level, wireless communication is necessary.
The current jammer technology, whether it is WiFi, 3G, 4G or 5G, has the frequency band to shield the mobile network.
If a full-band shield is used, theoretically, the possibility of successful transmission is small.
2. To realize wireless communication, electricity is required.
“If you don’t have electricity, how can you achieve wireless communication? I don’t know how to achieve it. Of course, there may be higher technology.” Electric equipment, through X-ray machine, will detect the power supply and related Structure construction.
to sum up
In recent years, entertainment stars have openly talked about his experience of cheating in the college entrance examination during the live broadcast; Gou Jing and Chen Chunxiu’s college entrance examination results have been publicly taken.
News of various gunmen for the exam is endless, and the results of various poor but outstanding students for more than ten years have been maliciously invaded.
Even the first discoverer of the photo cheating incident that shocked China in the college entrance examination turned out to be a search question app.
On the one hand, the college entrance examination was unable to enter the examination room because of wearing braces and the zippers of the trousers.
The contrast is too harsh.
The college entrance examination is recognized as one of the few pure land remaining in today’s society, and it can even be said to be the largest and fairest piece of pure land.
Although nearly tens of millions of candidates go to the college entrance examination battlefield in China every year, no matter how tight the organization and system are, it is inevitable that some disgusting impurities will infiltrate.
The college entrance examination in many places this year has ended, but the incident cannot end there. The management problems exposed are greater than the technical problems. It cannot be just canceling cheaters’ scores and strengthening security checks.Lei Feng(Public account: Leifeng.com)Lei Feng Net Lei Feng Net
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