Suanli 60

2. This is the second part of a series of articles on "key elements of becoming a better blockchain". Although decentralization is not an end in itself, it is a means to many ends, including resistance to censorship, corruption and collusion. Inclusive institutions with multi participation; And a fair distribution of wealth, power and influence. Decentralization is not suitable for most applications because of its low efficiency and high cost. However, for those applications that need decentralization, the underlying platform is much more reliable than the oral decentralized services. Did we go to the center? I want to remind us that decentralization is multidimensional, far from binary. Another closely related topic is unlicensed authorization, which will also be discussed here: allowing anyone anywhere to contribute to a project, platform or community is one of the most important parts of the spirit of decentralization

are there multiple client applications? There are two schools of thought. One assumption is that a single normative client application can concentrate limited resources on one project, and a development team can communicate more easily, which will maximize the success rate and competitiveness compared with other platforms. In addition, a single client application can prevent consensus failure caused by local account book inconsistency of different nodes (at least as long as each node upgrades its software after hard forking). On the other hand, the existence of multiple clients will make the network more likely to survive attacks (one client may stop block proction completely) or consensus failure (one or more clients cannot run the protocol correctly, which may lead to wrong block or stop block proction completely). In fact, both happened in Ethereum. But there are more subtle reasons. Firstly, the parallel application of multiple clients reces the dominant influence of a single core development team on the network, which is one of the biggest problems of bitcoin governance (zcash foundation will also decide to build a second zcash client to balance the power of electric coin). Moreover, different clients may make different architecture decisions and have different advantages (for example, mining, data search), and using different languages to write clients can enable more developers to participate in core development. Although parallel applications and beta applications are very good, the mainstream is the main network client: for example, bitcoin has at least 15 client applications, but 97% of the nodes run a program, that is, bitcoin core
how many organizations control mining computing power? The more parties involved in mining, the more difficult it is to collude with each other to engage in selfish mining, or to engage in double flower attacks (commonly known as 51% attacks, but the actual mathematical principles are more complex). This is not a hypothetical risk, as it has occurred in networks such as Ethereum classic and bitcoin gold. In addition, more miners means a fairer distribution of mining rewards. Although many indivial miners may participate in mining, because of incentives, they will gather in a few mines, and even a seemingly decentralized network may rely on a few entities for Mining: the three largest Ethereum mines jointly control 60% of the total power, while bitcoin's top four mines account for about 56%.

3. virtual currency was born in Europe and the United States, broke out in Europe and the United States, pushed the historical high point of bitcoin and other virtual currencies, brought bitcoin and other virtual currencies into a new period, in winter, bitcoin and other virtual currencies hyped, which is concive to the far development of bitcoin and other virtual currencies, on the other hand, accelerated the spread speed of bitcoin and other virtual currencies

at present, 60% of bitcoin's computing power, 60% of transaction currency, bitcoin and other virtual currency markets occupy the leading position The figure of Duhua, a virtual currency, is better than that of Li Qiwei, the founder of Laite coin. Yuanbao coin, Fuyuan coin and Zhaocai coin are all proced in China. Zeng Hongji bitstock pit LiXiao investment project

pay attention to virtual currency research. Bitcoin related enterprises pay more attention to infrastructure construction research and development in Europe and America

4. Silverfish mining machine is currently pre-sale, delivery date is June 2014, the official website price 62888.00 yuan. The main performances are as follows:
computing power: 60m, overclocking up to 100m
power consumption: 1000W
gridset blade miner
gridset blade miner is now in stock, and the official website price is 18000.00 yuan. The main performances are as follows:
computing power: 5.2m, overclocking up to 6m<
power consumption: 100W
revenue calculation
to calculate the revenue of the two mining machines, the following general indicators are selected as the model:
electricity charge: 0.6 yuan / kWh
difficulty increases, increasing by 2% every 2.5 days Rough estimate)
the middle value of the calculation force of silverfish mining machine is 80m, and the middle value of gridseed blade is 5.6m
for gridseed spot, mining will start on April 11, and for silverfish futures in June, mining will start on June 20. The difference of 70 days is 28 difficulty adjustments
the LTC price is 69 yuan today
the current difficulty is 5808, and the theoretical profit per M computing power is 0.1732ltc per day< The calculation formula is as follows: < br / < br /
the formula is as follows: < br /
Sn < br /
Sn < br /
Sn < br /
Sn < br / < br /
the following formula is as follows: the following formula is as follows: < br / < br / < br /
Sn < br / < br /
Sn < br / < br / < br /
A1 (1-qn) / (1-Q) (1-Q) (1-Q (1-Q) (1-Q) / < br / < br / < br / < br / < br / < br / < br > < br / < br / < br / < the < br / < br / < br / < all < br / < br / < br / < br / < all < br / < br / < br / < br / < br / < br / < br / < br / < br / < br / < br / < br / < the number of LTC that can be g in a day
an : the number of LTC that can be g in 2.5 days after the nth difficulty decrease
Q:
ratio of equal ratio sequence, compared with the difficulty decrease times of this model, which is 1-0.02 = 0.98
n:
n:
until the power loss charge, n * 2.5 is the number of days that can be mined
W: power consumption, unit kilowatt
through calculation, the results are as follows:
conclusion
when the difficulty increases by 2% every 2.5 days, Silverfish mining machine can still dig back the cost of LTC and have surplus. Gridseed's blade miner obviously can't recover the cost of LTC, which means that it's better to buy miner than to hoard money
everyone's expectation of difficulty is not the same. It may only increase by 1% every 2.5 days. If you're interested, you might as well calculate it by yourself. Finally, silverfish's mining machinery is futures, and there is a risk of ticket skipping.

5.

On January 7, Qualcomm officially released its new autopilot computing platform, snapdragonride. The platform includes security system level chip, security accelerator and autopilot software stack, which can meet the computing requirements of the highest L4 / L5 autopilot. Qualcomm announced that the platform will be delivered to automobile manufacturers and first tier suppliers for preliminary development in the first half of 2020, and the vehicles carrying the platform are expected to be put into mass proction in 2023

interpretation: as early as 2012, Qualcomm entered the automotive chip field. Up to now, the cumulative amount of orders from Qualcomm in the automotive sector has reached $7 billion, up from $6.5 billion two months ago

however, the previous chips were all communication and entertainment chips. At the press conference, Qualcomm disclosed that it has been more than four years since it launched the autopilot chip. In 2017, Qualcomm obtained the license of automatic driving test in California. The purpose of this test is to verify its chip

currently, one of the biggest pain points of autopilot chips is that it is difficult to achieve the balance between computing power and power consumption. From the beginning, Qualcomm decided to make use of its accumulation in the mobile phone chip instry to make high computing power and low power ASIC chips. Snapdragonride, the L4 level automatic driving computing platform released by Qualcomm, is equipped with two self-developed automatic driving processors ml (ASIC), GPU and CPU

snapdragonride platform can achieve the highest computing power of 700tops with 130W power consumption. If this plan can be realized, then Qualcomm's automatic driving scheme is quite competitive in terms of computing power. For example, compared with the 144tops / 72W of Tesla hardware3.0, the energy efficiency advantage of Qualcomm's procts is obvious

among the mass proction schemes, Huawei's mdc600 has the strongest computing power, with 352tops computing power and 352w power consumption; Next is NVIDIA's drivepegasus, with 320tops computing power and 500W power consumption

according to the plan, the computing power of agxorin, the computing platform of Orin based on the next autopilot chip, can reach 2000tops, but the power consumption can also reach 750W, which can hardly be applied to mass proction vehicles

in contrast, Qualcomm's autopilot computing platform does not need a fan or liquid cooling system, but uses a simpler passive air cooling system to achieve higher reliability

snapdragonride platform also reces the number of chips and turns them into L2-L3 automatic driving solutions with computing power of 60-120tops or ADAS solutions with computing power of 30tops. At this CES, Qualcomm and GM reached a cooperation on ADAS business

in terms of business model, Qualcomm's approach is relatively open. It can provide full stack solutions, or only sell chips, algorithms and sensor solutions, which can be handled by customers themselves

in the future, v2x chip will also be one of the important revenue sources of Qualcomm in the automotive business

in addition, through its car to cloudservice, Qualcomm also provides technical support for car companies in cloud computing and Ota. It is worth mentioning that its car to cloudsoftsku supports the security upgrade of chipsets

this article comes from the author of car home, which does not represent the standpoint of car home

6. The revenue is as follows:
bitcoin 0.0172 BTC
RMB & # 165; 22.05
US $3.60

note: quotation and network computing power at 08:40 on January 16, 2015.

7. It's because the performance and cost performance of the 3060ti graphics card are very good, so it's not available.
everyone wants to buy this graphics card with high cost performance and strong performance, but the current proction and shipment volume is relatively small, so they can't buy it.
for i510400f, choose a graphics card of about 1500 yuan, such as ASUS or MSI,
the motherboards of these two brands are worth buying and trustworthy!

8. No one has found such a formula yet, but I also use 60 ° Fixed angle. sixty ° When the wind is 0, the force of the full screen is 50. From the left side of the large screen to the end of the force bar, the force is 40; And the terrain can also affect 60 ° Shooting. For example, if you are low and others are high, the strength is greater than usual; On the contrary, when you are high and others are on the ground, your strength is smaller than usual. Although 60 ° 1 screen strength is 50, 2 screen strength is not 100, 2 screen distance strength seems to be 80. So, 60 ° It is difficult to sum up a fixed formula for fixed angle The above is personal combat experience)

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2. Download to make money: open the software, and you can see "update now" on the left. Click to enter and you can see many apps, most of which are Samsung, but there are also two and one stars. The higher the star, the higher the computing power and the more TMC you get. Click on a software to download and install it to start earning TMC. Each app can calculate up to 60 minutes of computing power per day. 3-star and 2-star apps can enjoy 30 minutes of high computing power, and the remaining 30 minutes will be reced to 1-star computing power.

10. Barrel, right? First of all, a certain ideal must be known by many experts: the influence of wind on the force is only related to the firing angle, and has nothing to do with the firing force and the target distance. For example, one screen or half screen, you want to choose the firing angle of 70 degrees; Half screen force = 1.95 ± The wind * coefficient is 1. Strength of one screen = 2.7 ± The wind * coefficient 2. The relationship between coefficient 1 and coefficient 2 here must be equal, because the firing angle is 70 degrees. If the same wind is changed to 60 degrees, half screen = 1.5 ± The wind * coefficient 3, where coefficient 3 is definitely not equal to coefficient 1 and coefficient 2

of course, most of the players don't like fixed angle calculation, and I don't like it either. I'm not here to tell you a fixed angle calculation method. What I want to say is that you can flexibly use 60, 70 and 80 calculation methods. For example, if you are good at small throw, you can choose 70 for a distance of 20 and 60 for a distance of 30. Don't be surprised, don't think there may be a lot of coefficients, or it's very troublesome. Why is the title of the post called - 45 to - 90 degrees downwind play. Because the wind energy in this area is more regular, it's very fast. Please see the coefficient table:

firing angle 80 degrees 70 degrees 60 degrees

wind direction

- 90 (downwind) 0.005 0.015 0.025

- 80 no effect 0.01 0.02

- 70 - 0.01 (force rection) no effect 0.01

- 60 - 0.02 - 0.01 has no effect

firing formula: angle = half throw or small throw or funeral throw angle

strength = original strength + wind * coefficient

looks a little complicated? It's very simple to use it in practice: - 80 angle wind 20 degree screen distance

half throw = 70 degree 2.7 + (0.01x20) = 2.9 force

small throw = 60 degree 2.2 + (0.02x20) = 2.6 force

once you remember the coefficient, you can calculate the firing force. And you should pay attention to that many winds are non impact winds. If you are familiar with any throwing, try to use the non impact angle coefficient

finally, let's talk about error fine-tuning, first about firing angle. If the angle single digit is 1, 2, 3 or 7, 8, 9, the direct nearest coefficient is OK. If it is 4, 5, 6, fine adjustment of 10 wind is 0.025, fine adjustment of 20 wind is 0.05. There may also be an angle of - 75 degrees - 85 degrees - 65 degrees, the same 10 wind fine-tuning 0.025, 20 wind fine-tuning 0.05. Play is just a reference, but also more practice and experience

someone asked: can't the wind in this area play like this? Of course, it's OK, but when the angle is not the standard angle (60, 70, 80), there is an error. Because this area coefficient is relatively low, the error can be ignored basically, so it's better to use this method (mainly for the fast calculation). The error is not only 0.025 0.05 e to the large influence of other winds

finally, no play is invincible, and every play has its disadvantages and advantages. This play method is simple algorithm, the accuracy is not as good as small throw, want to 100% head to add more experience. Experience is something you can't write down. Wood must master a variety of playing methods, and then choose the simplest and most effective method under different ranges and wind directions, so that you can become a wood expert.