1 Introduction sensing technology and RFID integration application also has just started, China as the world's manufacturing powerhouse and one of the major power consumption should be firmly seize this opportunity, independent exploration, promote RFID industry development, enhance the level of the information society.
RFID, radio frequency identification technology, the use of radio frequency signal through the spatial coupling (alternating magnetic or electromagnetic fields) for non-contact information, and through the delivery of information to identify the objective as the 21st century most promising and important industry and application technology. RFID label is of small size, high capacity, long life, reusable, and other characteristics, can support a fast read and write, non-visual recognition, mobile identification and target identification, location and long track management. Efficiency and reducing error rates, promote RFID technology into the medical industry informatization of important cut point. [1] At the same time, the RFID is gradually and sensing technology convergence towards a ubiquitous, can be readily perceived "sensor network" in the direction of the management for medical supplies, especially blood management brings a new opportunity. Integration with RFID sensor technology monitoring blood quality, track blood supply process, will be more conducive to the protection blood safety [2]. At present, the supply of hospital blood Germany Saarbruecken blood has joined the RFID technology to standardize management, and ensure the correct number for the blood and the correct match, but in China also uncommon with the RFID technology used for blood management. 2RFID fusion sensing technology used in blood management of blood management business processes: blood donation in general register a physical examination of a blood test and a blood collection a blood person library a library management (component processing, etc.) a blood out of a hospital for patients to use (or made into other blood products). In this process, often involve large amounts of data and information, including donors, blood type, blood sampling time, location, sponsor, etc. A lot of information to blood management creates certain difficulties, combined with the blood is a very easy modification of the materials, if environmental conditions would not be appropriate, the quality of the blood is destroyed, so blood in storage and transit, quality of real-time monitoring is crucial. RFID and sensor technology is able to solve the above problem, effective power blood management of emerging technologies. RFID technology could provide for each bag of blood on their unique identity and stored in the appropriate information and background database Internet, and therefore, blood in blood collection point or points in the mobilization of blood banks, or at the point of use, the whole hospital is RFID system monitoring, blood in the mobilization of points of information can be tracked at any time. Previous blood out people Gallery time-consuming, laborious, before use, you also need to check the manual for information, the use of RFID technology, without precise positioning can mass to real-time data acquisition, transfer, check and update, accelerates the blood of the who library identification, also avoids the manual check error occurs frequently. But RFID Contactless identification characteristics also to ensure that blood is not affected by pollution conditions for recognition and measurement, reduces the likelihood of blood contaminated, it is also not afraid of dust, dirt, low temperature, etc., to be able to store blood of special environmental conditions to maintain normal working operations. Sensing technology is aware of, access to and inspection information window, it allows for data collection and quantification, processing application integration and transport. Through the sensor on the ambient temperature, sealing and vibration level, and so on, real-time monitoring and collection, and then through the system on the perception of information in a timely manner and react effectively to avoid deterioration of blood, guarantee the quality of the blood. Will RFID and sensing technology integration, application can improve the efficiency, achieving recognition information tracking and real-time monitoring of goods quality of RFID sensor tags, they will be able to truly realize the blood management of intelligent information. 3RFID sensor labels RFID sensor tag primarily designed by micro-control units, sensor unit, RF modules, communication unit, positioning unit and power supply modules, as shown in Figure 1.3.1 micro-control units-control unit consists of embedded systems, including embedded microprocessors, memory, embedded operating system, and also integrates the watchdog, regular/counters, synchronous/asynchronous serial interface, A/D and D/A converter, and I/O and other necessary functions and external devices.
The implementation of major functions include: responsible for the entire chip task allocation and scheduling, data integration and data transmission, wireless, complete data analysis, storage and forwarding, regional network routing maintenance, chip power energy management, etc. 3.2 sensing unit sensing unit mainly consists of a sensor and A/D converter. The sensor is able to feel the provisions of the measure and to follow certain rules to convert it into usable output signal of the device or devices. Usually the sensor by the sensitive element and transform components, the sensitive element collection of external sensors information required to be sent people to switch components, the latter through the physical quantity into the system can be recognized by the original signal, and through the integral circuit, amplifier and plastic processing, finally a/d converted to digital signals and sent people micro control unit for further processing. Taking into account the storage and transport of blood on the environmental conditions required, the sensor unit contains a monitoring range of temperature, pressure, photosensitive, oscillation and many other physical signal test functionality. 3.3 RF unit RF unit control receiving and sending radio signals, and select multi-channel using air separation, time division multiplexing, Frequency division multiplexing and code division multiple access methods, such as road towards more targeted at identifying and anti-collision system. 3.4 communication unit communication module for data communication, wireless communications carrier frequency selection, data transfer rate, signal modulation, coding, etc., and through the antenna to the chip and the reader asked data receiving and working with data integration, the request for arbitration and the Routing and other functions. 3.5 positioning unit positioning unit for chip itself location positioning and information transmission azimuth positioning. Based on wireless transmission protocol, such as IEEE802.15.4 standard and ZigBee Protocol, etc. Positioning algorithm can be selected based on the location (such as the signal strength of the location, the time difference range, etc.) or is not based on a range of methods (such as mass Center method, DV-Hop algorithm, etc.). 3.6 RFID sensor tags power supply units are passive, passive and active. Passive tags do not require chip built-in battery, it by extracting the reader's RF energy to maintain work. -Passive and active tags requires an internal battery to maintain normal sensing and RF. Taking into account the management of blood on blood products of real-time monitoring of the need to guarantee the continuous, normal energy supply, therefore joined the PSU, designed for half a passive or active label [4]. In this section, by reasonable set of receiving, transmitting chip and standby, you can solve the energy consumption and transmission reliability problems, effectively extend the life of the chip. 4RFID sensor labels in blood management primarily from blood warehousing management, blood tracking management, blood quality control three aspects are described that RFID integration sensing technology in blood management effective role. 4.1 blood warehousing management 4.1.1 blood into the library staff will blood bags on the conveyor belt at the turn of the population, there is a belt of bottom mounted RFID readers, when blood bag on RFID sensor tags into the read-write to read range, the label information audibly via middleware filtered pass to back-end database, and the system is blood types, types, specifications and other information displayed on the screen at the exit conveyor belt, staff according to the displayed content, people will be placed in the blood of storage tray is specified. According to the reading out of the blood group, type, specifications, quantity, etc., the background system for blood banks location identification, look for the existing compliance and the number of empty shelves. This step is primarily through the implementation of each shelf on an RFID tag and reader writes it should be stored blood type, type, specifications, quantity, and other information, when the blood bag on the shelf, the staff used handheld reader on the RFID tag is set to write, when the shelves of blood bags out of the library, or shift, staff use handheld reader on the RFID labels clear bit writes, and mounted on top of a blood bank will be subject to a system reader and direction on the shelf labels for reading, discovery has been clear bit and warehousing conditions let system of shelves, and the system will give the exact number of shelves is displayed in the library of screen, informing staff of which type of blood which should be placed on the shelves. Staff was directed to the various specifications of blood give specified regions for cold storage. At the same time, the reader will the blood bag storage time, library type, the Métis, who received blood, such as information written to the RFID system [5].4.1.2 blood out of the library system to release the shipment order directing staff to remove the specified range to the specified type, specifications and quantities of blood.
If the blood of a smaller number, staff may use hand-held readers directly to read blood information; if the blood to the number of staff may use the conveyer blood out of the library and read their information. Read out the information transmitted to the system, and a background check, if the database is correct, to permit a library. A library procedure, RFID system to record the library time, blood valid date and time information. The order of blood out of the library to read information from system analysis to decide to require the same kinds of blood in accordance with the principle of first in, first out, avoid inventory backlog and the phenomenon of the blood expired waste. For blood banks are marked as "quarantine" status of blood against their out of the library in order to guarantee the quality of the blood out of the library. 4.2 blood tracking management blood tracking management uses a hierarchical structure based on clusters. Each cluster head which is a distributed information processing centre, used to collect data on all cluster members and complete data processing and fusion, then data transmitted up one level cluster head, delivery, end all filtered data and upload to the consolidated top level cluster head and its inverse process that is, information discovery processes, data cascade, order tracking. Here, the top cluster head is equivalent to the national blood Centre, and high-level cluster head is equivalent to the provinces, autonomous regions and municipalities directly under the blood center, and so on, the lowest layer of the cluster member is the grassroots blood. This hierarchical structure turn information spread out and avoid storing them, solving the problem of excessive amount of information, but also improves the security of the system. Information exchange and delivery in child and parent layer directly expand, facilitates queries and tracking. Structure as shown in Figure 2.Blood information stored procedure for the first bag blood of RFID identification code with their corresponding information stored in a database-level blood station, then the blood at the fusion of information, the identification code and the grassroots blood a valid IP address stored in the local municipal blood information center database, and then merging the information centre of the municipality of blood, the identification code and the city-level blood center of valid IP addresses into the local provincial blood information center database, and finally on the provincial blood fusion center of information, the identification code and the provincial Blood Center of valid IP address to the national blood Centre database (if necessary, you can then apply the identification code and the country's blood center of effective IP address stored in the global blood
Information Center database, global blood information Internet) [6-7]. Blood information tracking process: according to RFID identification code, first of all to the national blood information center database to find the bag of blood is a member of the provinces, according to the IP address into one of the provincial blood information center database to find the bag blood belongs to city information, according to the IP address into the municipal information center database find the blood bag blood belongs to blood, according to IP address enter the blood center database, according to the information they can know the bag of blood is present in the library of the State or out of the library were saved using or metamorphic scrap, if it is already in use, you can also find further to the consumer of all information. 4.3 blood quality control blood for temperature sensitive, if the ambient temperature is not suitable, the substance in the blood is destroyed, this will affect the quality of the blood and save time. Storage, transfer and transport of blood also should avoid vigorous oscillatory, in addition, the blood of packaging should be tight, if due to puncture or other factors causing bacteria, blood will be scrapped. Blood bag on RFID sensor tags for blood bags surrounding environment monitoring in real time, every time interval as measured at the surrounding temperature, pressure, photosensitive, oscillation, and other physical signals and measurement data recorded in the tag chips. The system will give the label a range within the set standards, once the current measurement data is less than the lower bound of the range or scope of the higher ceiling, the label will take the initiative to launch RF signal start alarm equipment, tips to personnel. [8] If the blood bag is in the blood bank to save state for alarm, then according to receive RF signal, alerting the display will show the current position of the alert blood bag (reservoir, shelves, RFID identification code, etc.) to facilitate staff timely detection and treatment; if blood bags are in transit for alarm, alarm device can be installed in a transport container, with a chorus of calls or Flash tip staff, staff discovered, with a handheld reader receives RF signals, in accordance with the identification code found alarming blood bags. Blood once suspected deterioration or contamination, staff will use the reader to its label is set to "quarantine" status, are not allowed out of the library, is already in use does not allow the use of, and has been tested and found to be sure not to use a high pressure after disinfection of incineration, the staff will be the blood bag RFID identification code information to the system writes the scrap, scrap reason for subsequent blood tracking. For rejected blood, in addition to the need for artificial blood quality further testing, you can use RFID sensor tags data records, find out the blood from blood collection to the blood supply to be back in the blood this problem, identify the responsible officer or agency of the reasons to avoid the next time a similar situation. 5 conclusion blood is the source of life, and a variety of disease transmission channels, through blood transfusion or blood products spread of common diseases: hepatitis b, hepatitis c, HIV, syphilis, malaria, septicemia, mostly difficult to cure. In order to avoid improper blood collection, bags of blood transfusion management chaos or incorrectly, leading to disease transmission or medical accidents, strengthening blood management, protection of blood safety is imperative. At present, RFID and sensing technology used also is not very widespread, but has demonstrated a broad application prospects. This article presents a fusion of these two technologies together design of RFID sensor tags, and apply it to the advantage of blood management and feasibility [8]. Blood management is an unforgiving to RFID sensor tag applied to them, not only makes the entire supply chain management is visible, transparent, non-contaminated, also make information, quality, etc. is real-time monitoring and Internet tracking, real blood management information, medical information management work extended to the peripheral, fell to the letter, so that full individualization of humane care have been achieved. References: [1] HIGHTOWERJ, BORRIELLOGAsurveyandtaxonomyoflocationsystemsforubiquitouscomputing [R] .WA: Universi-tyofWashington, DepartmentofComputerScienceandEngi — neering, Seattle, 2001. [2] sunhong. distribution center management [M] £ ® Beijing: higher education press, 2005: 100-190. [3] Li Jin-tao1, Guo Chun wave, Luo Hai-Yong, etc. radio frequency identification (RFID) technology and its application [J]. information technology letters, 2004, 11 (2): 1-10. [4] BAHLP, VENKATAN, PADMANABHANVNRadar: anin-buildingRF-baseduserlocationandtrackingsystem [C]//ProcIEEEInfocom2000.LosAlamitos, California, USA, 2000: 775-784. [5] Sun Yu, van Ping Chi. RFID technology and its applications in indoor positioning [J]. a computer application, 2005, 25 (5): 1205-1208. [6] sunhong. logistics information management [M] £ ® Shanghai: Lixin Publishing House, 2006: 143-187. [7] HIGHTOWERJ, WANTR, BORRIELLOG.SpotON: anindoor3DlocationsensingtechnologybasedonRFsignalstrength [R] .WA: UniversityofWashington, Departmen tofComputerScienceandEngineering，Seattle，2000． [8]RENJ，SUNH．Awarehousemanagementmodelbasedonrfidtechnology[C]//Proceedingsofthe5thInternationalConferenceonMaterialHandlingICMH2005．Chongqing，China，2005：132—136．
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