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The ucode system (written in lower case "ucode") is an identification number system that can be used to identify things in the real world uniquely. Digital information can be associated with objects and places, and the associated information can be retrieved by using ucode. Unique identification system for real world objects is considered an essential enabler for the realisation of Internet of Things and therefore ucode system is seen as a building block for Internet of Things The ucode system uses 128 bit code for unique naming of things so there are 340282366920938463463374607431768211455 or 3.4 x 10^38 different codes. If more codes are needed, they can be added in chunks of 128 bits. Ucode is application and technology agnostic. Uniqueness means that each ucode is unique, there can – or at least should - not be another ucode with exactly same number. Ucode is not tied to any specific application or business domain, neither is it committed to any specific technology for containing the ucode number, e.g. RFID, barcode or matrix code. ucode is supported by the uID center, which is a non-profit organisation based in Tokyo, Japan. The Chairman of the uID Center is Professor Ken Sakamura who is also the person behind ucode. ==Structure and Resolution mechanism== Ubiquitous ID system consists of five components: (1) ucode, (2) ucode tag, (3) ubiquitous communicator, (5) ucode resolution server and (6) ucode information server. The resolution process goes as follows. First, the ucode from a ucode tag using e.g. a mobile phone is read. The camera of the phone can be used to read a matrix code containing the ucode. Then, the mobile phone inquires the ucode resolution server – via internet connection - about the code. The ucode resolution server returns the source of the provided ucode information based on the ucode read. Finally, the ubiquitous communicator connects to the information provision source and acquires contents and services. The ucode server architecture is similar to the familiar Internet DNS resolution service. Like DNS, the ucode resolution mechanism consists of hierarchical levels. The ucode resolution mechanism is three tiered as follows *uID center maintains the root server *Top level domain (TLD) servers are under root *Second level domain (SLD) servers are under TLD The root server is maintained by uID Center in Tokyo. TLD servers are in place in Japan, other Asian countries and in Europe (Oulu, Finland). The number of TLD and SLD servers is not limited. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ucode system」の詳細全文を読む スポンサード リンク
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