The core technology of blockchain
From the perspective of technology and architecture, I will tell you my understanding of blockchain in common language
what is blockchain? In a word, blockchain is a storage system. To be more specific, blockchain is a distributed storage system without an administrator and each node has all the data
What are the common storage systems like
first, how to ensure high availability
the common storage system usually uses "rendancy" to solve the problem of high availability. As shown in the figure above, if the data can be copied into several copies and rendant to multiple places, high availability can be guaranteed. The data in one place is hung, and there is data in other places. For example, the master-slave cluster of MySQL is the same principle, and the raid of disk is also the same principle
two points need to be emphasized in this place are: data rendancy often leads to consistency problems
1. For example, in the master-slave cluster of MySQL, there is actually a delay in reading and writing, which means there is a inconsistency in reading and writing in a short period of time. This is a side effect of data rendancy
The second point is that data rendancy often reces the efficiency of writing, because data synchronization also consumes resources. If you add two slave libraries, the write efficiency will be affected. The common storage system is to use rendancy to ensure the high availability of dataso the second question, ordinary storage system, can write more
the answer is yes, for example, take this graph as an example:
in fact, MySQL can do a master-slave synchronization of al masters, master-slave synchronization of al masters, two nodes can be written at the same time. If you want to do a multi room multi live data center, in fact, multi room multi live data synchronization. What we should emphasize here is that multi-point writing often leads to the consistency problem of writing conflicts. Take MySQL as an example, suppose that the attribute of a table is self incrementing ID, then the data in the database is 1234 now. If one of the nodes writes and inserts a piece of data, it may become 5, and then these 5 pieces of data are synchronized to another master node, Before synchronization, if another write node inserts a piece of data, a piece of data with self incrementing ID of 5 will be generated. Then, after the generation, synchronize to another node, and the synchronized data will conflict with the two local 5's after it arrives, which will lead to synchronization failure and write consistency conflict. This problem will occur in the case of multi-point writing
how to ensure consistency in multi-point writing
the reform "Swan class" gives you more technical work
take trading activities as an example. In the past, the two sides who did not trust each other usually chose an intermediary to guarantee a transaction. In the mobile Internet era, we chose Taobao shopping because Alipay provided us with an intermediate guarantee. We chose to drop dripping because it provided us with information matching.
however, these intermediaries are centralized and have their own interests. Sometimes they are not so reliable and trustworthy. Theoretically, Alipay's centralization of accounting has been artificially falsified. Part of the reason for Didi's troubles is that they only think from their own standpoint
what blockchain does is the machine of trust, which replaces the role of trust intermediary with code, ensures the fairness and justice of the whole system through consensus mechanism and distributed accounting, and provides a trust without trust
for example, in the future, people can abandon the intermediate platform and realize point-to-point docking and free trading through blockchain. Shopping does not need to go through an intermediary, and taking a taxi does not need to go through Didi. In this way, we can really achieve "no middleman to earn the price difference" and rece the cost.
The core technologies of Agricultural traceability blockchain are: one is the decentralized (distributed in the network), tamper proof and other features of blockchain to ensure the safety and reliability of data. The second is real-time through intelligent monitoring devices to directly communicate with nodes , store relevant data in nodes and broadcast to the whole chain , and the third is through radio frequency identification (RFID, things like two-dimensional code) and chips, Using the traceability of blockchain to establish traceability mechanism for agricultural procts
Weihai Guangtai:
in December 2014, Weihai Guangtai (002111) signed a series of UAV system development cooperation agreement with a cooperative unit, in which a certain type of high-speed UAV has been successfully tested. The company said that the signing of the agreement laid the foundation for the two sides to carry out strategic cooperation in the field of UAVs and jointly develop a series of UAVs. On September 29, 2015, the company plans to issue no more than 21.5 million shares at a rate of no less than 27.73 yuan per share, and raise no more than 540 million yuan of funds to invest in UAV projects and supplement 160 million yuan of working capital of the company. The company plans to invest 380 million yuan in the acquisition and capital increase of Quanhua times and the UAV project< Aerospace Science and technology:
the third Academy of Aerospace Science and instry, the major shareholder of the company, has profound knowledge in the field of UAV. A UAV command station of the company has been successfully developed recently, and Haiying UAV has assisted Beijing police to participate in air drug control operations as early as last year. The company has the expectation of injecting UAV< Aerospace Electronics:
the company's UAV procts were exhibited at the 8th China International Police Equipment Expo in 2016. There are six types of Rainbow series UAV procts on display, which can meet the requirements of aerial reconnaissance and surveillance, automatic target tracking, three-dimensional target detection, accurate target strike, on-site image acquisition, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target tracking, automatic target Information processing, information sharing and other functional requirements; On the evening of July 28, 2016, it was announced that it planned to jointly invest with the controlling shareholder China Aerospace Times Electronics Co., Ltd. to establish three subsidiaries, namely: Aerospace Times UAV Technology Co., Ltd., Beijing Aerospace Feiteng Equipment Technology Co., Ltd., and aerospace Internet of things Technology Co., Ltd., in order to promote the development of the company's UAV instry and build a development platform for precision guidance system instry
Raptor Technology:
in January 2015, raptor Technology (002577) invested 50 million yuan, holding Shenzhen zero intelligent aircraft Co., Ltd., and officially entered the UAV market. As a domestic leading enterprise of wireless keyboard and mouse, raptor technology has many years of R & D and proction experience in the field of wireless transmission technology, with outstanding hardware supply chain, proction capacity, quality control and other capabilities. In order to enhance software strength through acquisition, raptor technology is expected to build an integrated platform of UAV software and hardware<
xuelaite:
in September 2015, the company planned to raise no more than 350 million yuan of funds through non-public offering of shares, adding strategic weight to the previously focused UAV field. In May 2015, the company entered the field of consumer UAV through the acquisition of Manta intelligence. This time, the company decided to increase the UAV field, which will rapidly improve the UAV proction capacity of the company and accelerate the development of the UAV instry of the company
Nanyang Technology:
in October 2016, the company plans to purchase 100% equity of rainbow company with 2.416 billion yuan and 84% equity of Shenfei company with 729 million yuan. At the same time, it plans to issue shares to the 11th Aerospace Research Institute to raise 1.4 billion yuan for the construction of rainbow UAV instrial base and the development of new concept UAV. Rainbow UAV brand started in 1999, with rich proct spectrum and advanced technical indicators in the world. It is the UAV series with the most complete model spectrum, the earliest batch export and the largest export volume in China< Longxin GM:
on August 22, 2014, it announced that the company signed a joint venture framework agreement with Professor Wang Haowen of Tsinghua University and Lihe venture capital, and plans to jointly invest to establish a joint venture company, specializing in the R & D, manufacturing and sales of complete UAV system and parts. The company plans to invest 50 million yuan and hold 50% equity of the joint venture
Xin'an shares:
the company invested 13.5 million yuan in Anyang Quanfeng Aviation Plant Protection Technology Co., Ltd., the holding subsidiary of Quanfeng biology, holding 15% of its equity. The company's main business is "agricultural UAV research and development, assembly, flying hand training."< In May 2013, Shanhe technology was officially awarded the "proction license certification" for all composite light sport aircraft; On May 11, Shanhe technology aviation instry base was officially put into use. The proction workshop of the base can meet the proction demand of more than 300 sa60l light sport aircraft per year. At present, it has completed the design, manufacture and flight test of Aurora, ST series power delta wing, flying eagle UAV system, flying geese remote sensing mapping UAV system and flying tiger UAV system. It is the first domestic enterprise that has passed the airworthiness certification of CAAC light aircraft
Shandong mining machinery Co., Ltd.:
in March 2013, the company invested 41 million yuan to establish a joint venture UAV company, accounting for 82% of the equity. After the establishment of the joint venture company, it will focus on UAVs with long idle time, large payload and outstanding short takeoff and landing performance, which are mainly used for reconnaissance, detection, patrol, surveillance and other tasks. In April 2014, the company's UAV project has been optimized and wind tunnel tested for 12 times, and the aerodynamic design has been frozen and solidified; Flight control simulation is over; The structure design and tooling die design of UAV prototype have been completed, and two experimental verification prototypes have been put into proction