BCC dynamometer
at present, the BCC network has become stable, the block speed is basically close to an average of 10 minutes, and the computing power of the whole network is basically stable at 5% - 10% of that of bitcoin
generally, it is through mining or direct purchase on the trading platform!
Bitcoin, English name bitcoin, is a digital currency based on blockchain technology, which is composed of a series of computer-generated complex codes. Like RMB's ￥ and US dollar's $, bitcoin has its own symbol, the "B" in the figure below
The inventor of 
bitcoin is Nakamoto. Satoshi Nakamoto is the creator of bitcoin protocol and its related software bitcoin QT. In 2008, he published a paper called "bitcoin: a peer-to-peer electronic cash system", describing an electronic currency and its algorithm that he called "bitcoin"
In 2009, he released the first bitcoin software and officially launched the bitcoin financial system In 2010, he graally faded out and handed over the project to other members of the bitcoin communityNakamoto is believed to hold about one million bitcoins. If the price of each bitcoin was $2W, it was worth $20 billion at one time. So far, his true identity is still unknown to the outside world, that is to say, no one knows who Nakamoto is
bitcoin appeared after the global financial crisis in 2008. In fact, before that, many people have tried electronic currency, digital currency and virtual currency, but they have not succeeded. There are not only technical reasons, but also social environment and economic background reasons. To some extent, it was the 2008 financial crisis that gave birth to bitcoin
BCC started mining at 20:00 on August 1, and separated from the bitcoin main chain in block 478559. The first BCC block was excavated in viabtc, the Chinese ore pool, and then the next block 478560 was excavated. Before the separation from the main chain, the data stored in the blockchain and the running software are compatible with all bitcoin nodes. After the separation from the main chain, it begins to execute new code and package large blocks. Thus, a new BCC blockchain is born, and BCC also begins to develop independently.
The full English name of CC in the email is carbon
the English full name of BCC in the e-mail is blind carbon
the difference between the two is that the recipients in the BCC column can see all the recipient names (to, CC, BCC), while the recipients in the to and CC columns can't see the BBC recipient names
CC is abbreviated as CC, which comes from carbon . In the era of manual mechanical typewriter, using carbon paper, two or more copies of the same document can be printed at one time and distributed to different people
BCC is the abbreviation of BCC, which comes from blind carbon . For some reason or consideration, if you don't want the recipient to know that you sent this email to another person, you can put the email address of the person behind the scenes in the BCC column
generally speaking, use & quot; CC & quot; When serving, the e-mail address of multi person CC is & quot& quot; Separation
example:
If: a sends email to B1, B2, B3, CC to C1, C2, C3, Bcc to D1, D2, D3
then:
A knows that he sent e-mail to B1, B2, B3, copied to C1, C2, C3, and secretly sent to D1, D2, D3
B1 knew that this email was sent by a to B1, B2 and B3, and copied to C1, C2 and C3, but did not know that it was secretly sent to D1, D2 and D3
C1 knew that this email was sent by a to B1, B2 and B3, and copied to C1, C2 and C3, but did not know that it was secretly sent to D1, D2 and D3
D1 knows that this email is sent by a to B1, B2 and B3, copied to C1, C2 and C3, and secretly sent to himself, but does not know that it is secretly sent to D2 and D3
if someone has mastered more than 50% of the computing power, he can find the random number needed for mining blocks faster than others, so he actually has the absolute effective right of which block
he can:
1. Modify his own transaction records, which enables him to make double payments
2. Prevent the block from confirming some or all of the transactions
3. Prevent some or all of the miners from mining into any effective block
CCR model assumes that DMU is in the case of fixed returns to scale to measure the total efficiency
BCC model assumes that DMU is in the case of variable returns to scale, which is used to measure pure technology and scale efficiencyas a method to deal with multi-objective decision-making problems, the advantages of DEA are mainly reflected in the following three points:
1. There is no need to assume any weight, and the optimal weight of each input and output is obtained from the actual data of the decision-making unit, which can avoid subjective factors
The weight of each input and output of the decision-making unit is taken as the variable to evaluate from the perspective of the most beneficial to the decision-making unit, so as to avoid the weight of each index in the sense of priority It is assumed that each input is related to one or more outputs, and there is a certain relationship between the inputs and outputs. The DEA method does not need to determine the display expression of this relationship
extended data
DEA is a linear programming model, expressed as the ratio of output to input. By comparing the efficiency of a specific unit with the performance of a group of similar units providing the same service, it tries to maximize the efficiency of the service unit. In this process, some units with 100% efficiency are called relative efficiency units, while others with efficiency scores lower than 100% are called inefficiency units
In this way, enterprise managers can use DEA to compare a group of service units, identify relative inefficiency units, measure the severity of inefficiency, and find ways to rece inefficiency by comparing inefficiency and efficiency unitsNRA: negative correlation regulation
PRA: positive correlation regulationBCC: cross cylinder
negative correlation
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positive correlation
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example:
ntlypositive correlation; The results show that organizational justice is positively correlated with job performance
cross linker
eng [Kr & 596; s ˈ silində] Mei [Kr & 596; s ˈ sɪ lə ndɚ] Dynamic simulation of fork lift cross cylinder steering bars
BCC model is a model to evaluate technical efficiency. Relative efficiency means that the DEA efficiency in DEA model is relatively effective, that is to say, relative to other similar DMU units, it is not really technical efficiency and scale efficiency
it is up to you to collect data on input and output, and determine which inputs and outputs are.