Most of the time students in the university cannot access student Wi-Fi service without getting slow. Then they tend to use their mobile phones’ mobile hotspot service. This is a common situation for most of the internet users that have to face in their day to day life. But setting up the mobile hotspot service on their phones tend to be a little tedious.
ඔබ iOS දුරකථන පරම්පරාවක specifications සහ එම වසරේම එලි දැක්වුණු හොඳ වර්ගයේ Android දුරකථනයක specifications සංසන්ධනය කලේ නම් ඔබ iPhone හි අඩු RAM ධාරිතාවයක් ඇති බව පෙනෙනු ඇත. එහි ප්රතිපලයක් ලෙස iOS හි ඇති apps, Android apps වලට වඩා අඩු මතක ධාරිතාවයකින් යුතුව ක්රියා කරන බවට නිගමනය කරනු ඇත . සැබැවින්ම Android මෙහෙයුම් පද්ධතිය iOS මෙහෙයුම් පද්ධතියට වඩා වැඩි මතක ධාරිතාවයක් භාවිතා කරනවාද?
A group of Russian criminals called “Ad Fraud Komanda” or “AFK13” were caught earning money between $3 million to $5 million each day. They earn money by doing faking clicks on video ads on the advertising market. It is revealed by White Ops which is a security firm that provides online fraud detection solutions. This criminal is the biggest digital ad fraud ever.
First they created 250,127 distinct URLs and more than 6000 domains that appeared to belong to real reputed publishers. They misled the algorithms that decide where the most profitable ads would direct into buying their fraudulent web space. These algorithms typically make bids for ad spaces which are most suitable for advertisement’s intended audience. Hence their fraudulent web space was purchased by many reputed brands.
Then they invested heavily in a bot farm that consisted more than 570,000 bots. Next they triggered faked traffic on the ads using those bots, thereby driving a huge amount of revenue thanks to the pay-per-click scheme they’d exploited. Those bots have watched more than 300 million video ads a day, with an average payout of $13.04 per thousand fake views. This bot army was also programmed in order to imitate the actions of real people, such as faked clicks with mouse movements and social network login information. White Ops called this crime as Methbot campaign.
White Ops provided an example of how they faked a domain
They used thousands of IP addresses to make those bots appear more real, so they can bypass typical anti-fraud detection measures. Theses IP addresses were associated with major U.S Internet Service Providers, so it seemed they were based in America itself. Those IP addresses were fraudulently obtained from at least two of the world’s five regional Internet registries.
Those who were spending on the automated systems were losing a significant amount of money, not only because of the Methbot but also due to other similar campaigns. Those funds might never be retrieved. The White Ops company wrote in its white paper. “At this point the Methbot operation has become so embedded in the layers of the advertising ecosystem, the only way to shut it down is to make the details public to help affected parties take action.”
Source : http://www.forbes.com/sites/thomasbrewster/2016/12/20/methbot-biggest-ad-fraud-busted/#d7a1ada4ca8c
Ultrasonic Sensor HC-SR04 is used to measure distance. We can find precise distance to an object from the sensor, or can used to detect when something is within range of the sensor. It can measure distance with high accuracy from 2cm to 400 cm. Its operation is not affected by darkness or light .Because it uses sound to measure distance.
Ultrasonic range finder measure distance by emitting a pulse of ultrasonic sound that travels through the air until it hits an object. It measure the time of the sound pulse which travel forward & back to the sensor when the pulse hits the object. Then it sends an electrical signal to the Arduino with information about the time that sonic pulse traveled.
Ultrasonic range finder has 2 transducers.
