The analysis of pinniped scats has been used to quantify their diet, using prey remains to identify species and to estimate the numbers and sizes of prey consumed. There are, however, potential biases involved with scat analysis and, for this method to be used successfully, these biases need to be quantified. Thirty-six Antarctic fur seals (Arctocephalus gazella) were fed meals of exclusively either fish, squid, or krill and their scats were collected and analyzed. The major sources of error in the analysis of prey remains from scats were the differential erosion and passage rate of items in relation to their size. However, using simple correction functions, such as those which model otolith erosion, it is possible to reduce these errors. Using plastic beads as dietary markers showed recovery rates were negatively related to their size. Larger squid beaks had lower recovery rates than smaller beaks, but there was no size-related bias in the recovery rates of krill carapaces. Only 33% of the squid beaks and 27% of the otoliths originally fed were recovered from the scats. Recovery rates were greater for squid (77%) and fish (50%) eye lenses and these structures gave a better estimate of numbers eaten. Differences found between experimentally derived and published regression equations (used to calculate prey sizes eaten from prey remains) highlights the need for regression equations based on local prey characteristics, if these are to be used with any success to describe the prey eaten.
simple, domain name hijacking is the original ready access to a website user, imperceptibly, hijacked to the fake Web site, such as a user to visit a well-known brand online store, a hacker can through the Domain Name Hijacking means to bring it to a fake online store and collect user the ID information and password etc..
this kind of crime is usually realized by DNS server cache poisoning (cachepoisoning) or domain name hijacking. In recent months, hackers have shown the dangers of such attacks. In March this year, SANSInstitute found a 1300 famous brand name change in the direction of the cache poisoning attack, these brands include ABC, AmericanExpress, Citi and VerizonWireless; January, Panix domain was hijacked by an Australian hacker; in April, the Hushmail domain name server IP address is modified for connection to a hacker crudely made on the website.
tracking domain name hijacking statistics are not yet available. However, the anti fraud group (APWG) believes that this problem has been quite serious, the working group has been hijacked domain name to the recent work of the key tasks.
experts say, cache poisoning and domain name hijacking problem has already caused the attention and related institutions, with online brand growing, increasing turnover, this problem is more prominent, people have reason to worry, liar will soon use this hacker deception to a large number of users to obtain valuable personal information online, causing confusion in the market.
although, domain name hijacking is very complex in technology and organization. But in the current circumstances, we can still take some measures to protect the enterprise DNS server and domain name is not manipulated by domain name liar.
the root of DNS security problem lies in BerkeleyInternetDomain (BIND). BIND is full of security issues that have been widely reported in the past 5 years. VeriSign chief security officer KenSilva said, if you use the BIND based on the DNS server, so please follow the best practice of DNS management to do.
SANS, chief research officer at Johannes, said: "there are some fundamental problems with the current DNS, and the most important step is to insist on