All Kinds of Auto Rearview Mirror, Bring You the

With the rapid development of electronic technology, many intelligent and functional new technology have been widely applied to the auto,such as . Make an Inventory of Latest HID Kits for Grandma

First. intelligent ranging, display (back-draft radar) technology.

Various systems and devices that adopt USES radar (laser rangefinder principle, the ultrasonic) theories are widely applied to auto. It can more accurately measures the distance between the structure and obstacles, and holds the pilot's visual range on the instrument or alarms or for both in a digital form.

Second, digital rearview mirror.

Gentex company are researching to strengthen driver's visual effect by using a digital lens system. This system not only can reflect scenery clearly, but also can capture and showed visual information which are not obvious through several sensors. The sensors can change the contrast of light between objects, making objects more visible in the darkness, and it also can find dangerous obstacles in the sunshine blindfold place.

Precept concept car of G.m. is equipped with rearview mirror system of Donnelly company which is based on camera. This system makes use of an inner rearview mirror and two outside rearview mirror to abtain the scene around car, 3 scene synthesis to a panoramic images displayed on the screen, and convey the text message through words. The camera also can be used when you are reversing, when the car rear is closed to an obstacle, it will warn motorists in time.

Third, active rearview mirror and backward camera.

SCC car of Volvo company uses the "active rearview mirror and backward camera" technology, in fact, it is the integrate of digital technology and the video monitoring (reverse electronic screens) technology, the afterwards rearview mirror that embedded in the door can warn driver cars that come from "blind spots". When danger intensifies, drivers will also receive alarm that composed by video and audio signal. As the supplement of rearview mirror, both sides of car door in the rearview mirror purchase "backward type camera configuration," taking pictures with video image to appear in the glow of a display. When it is necessary, the driver can observe things by using it.

Fourth, "no blind spots" rearview mirror. The theory of "no blind spots" rearview mirror is not complex, it is convex mirror from the principle of optical. In comparison to diagonal, the same size of the convex mirror has wider view, but the image of object will be smaller. The radian of convex mirror is bigger, the view is bigger, but also the more deformation of objects.

Fifth, lambency rearview mirror that can prevent dazzle.

When someone is driving at night, strong light of the front cars reflected to the driver's eyes by the rearview mirror, making the driver can not open his eyes, which greatly increases danger.

The working principle of lambency prevent dazzle auto rearview mirror is to absorb or filter high-energy photons in strong light which is harmful to human's eyes, and enhance 550 nanometres yellow light which is beneficial to human. So, the driver can clearly see the road, walkers, cars that behind his own car.

Google Warns That One Million PCs Are Exposed to

Info PR: 6 I: 166,000 L: 131,148,579 LD: 135,138,149 I: n/a Rank: 191 Age: 九月 11, 2004 I: 8 whois source Robo: no Sitemap: no Rank: 77414 Price: 438 Links: 14 |75(5) Density

It was reported in the morning of July 23 by the US IT website PCworld that the engineer of Google Damian Menscher has currently discovered that as many as one million PCs which have adopted the Windows system might be infected by browser malware. This type of malware generates traffic through its deputy server's sending search information. This kind of attack has been existing in different forms for many years. But Menscher believes that purely from the attack scale of a malware family, this attack is rarely seen before. Menscher notices when conducting routine maintenance toward the database center that abnormal traffic is entering into the server of database center from a multiple number of suspicious addresses. Menscher immediately calls the security experts for help. Security experts discover after having completed the research that the traffic originates from a large number of PCs infected with redirection malware. Google has raised another protection shield to detect redirection attack. Once traffic request from malware is detected, a search page notice will be sent to the users: your computer might have been infected and you might have to conduct malware scan. Google has written in its official blog that we hope that through adopting measures to inform the users of their network access can help them update their anti-virus software and delete infected files. It is known that users can easily detect the signs of this attack, but it is difficult to remove and delete them. Users will sometimes receive irrelevant websites containing pornography, malware, false anti-virus software and colony products when applying to the Google search engine. This problem has pointed out straightforward the potential flaws in Google server: this company can only tell the infected users that there is something wrong with their computers, but they will not adopt measurer directly to solve these problems. The fundamental symptoms of the malware infected computers are: the configurated files in the PC will be infected and users cannot guarantee the success of file editing. Provided that the PC is indeed infected by malware, redirection is believed to reflect the deteriorating symptom of the problem. When that happens, users might have to reinstall their operating system or deploy the latest anti-virus software to remove the infected files. Google has not mentioned anything about the specific type of malware causing this problem. But menscher reveals that he thinks that the false AV Scareware might be the culprit. This can also explain why it seems that a large number of PC users have already been suffering from the negative influence.

Knowledge about Disk

1. How does disk fragment produce?In the disk partition, the files can be scattered to be saved in the different parts of disk. However, they are not saved in the continuous cluster in disk. And in the file operation, Windows system may take use of virtual memory for management procedure. So, it will lead each program to have access to the disk with frequency so as to produce disk fragments. 2. The principle of reading and writing operation of diskKnowing the reason of disk fragmentation, we need to understand reading and writing action of a disk when the program is running. Generally speaking, when a program is running, head of disk drives first searches the necessary files with which this program is running. Then it recognizes data and finally does processing, namely, sending data to disk Cache (by using locally cached information) and memory. Searching time is called an average seek time in performance index. Its unit is millisecond (ms). Currently average seek time of the main drive is less than 9.5 ms. If the relevant files of the application can be placed into the continuous space on disk, the search time of the read head will reduce a lot. Reading is the same. Some data is located below the section of the magnetic head. The time needed for data that disk reads is one fifth than the time needed for reading the same data when the head is moved to another place. During reading disk, the system will check whether the data is in the cache. If it is in the cache, disk is directly read; if not, disk is visited, namely, reading disk. When the same data needs to be read many times, cache plays a very important role. But for the first time to read some file, cache cannot work. So, in a large extent, the search time and read time influence the efficiency of the program execution. Of course, all of the above explanation also can be summarized as the vivid explanation of teacher at school. It is supposed that _ is the space left after deleting files and 1 is disk file. And the messy disk space is _1_11_1_. Then if you want to copy files 111, they are not certainly contained in the space. Instead, they can be only scattered to insert once again, which, of course, will reduce the efficiency of the file read. But if the disk is tidied up, the space will become 1111___. So, the files 111 can be copied in the tidiest way. In fact, there is so much about disk above. But it is only proved that as long as our hardware manufacturing technology and physical media have not changed, the principle above absolutely exists and is applicable, no matter how much its performance can be improved. These are seemingly simple, but sometimes in use you will really become blind due to “hand feel”. Then, you will misunderstand that the hard drive is very good and fail to know the slower speed, let alone clean up the disk.