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With the development of society, it began between the various sectors and industries increasingly high integration of information, and the image retrieval technology has played an increasingly important role in the current exchange of information. Image retrieval faster, higher accuracy, then the computer used in image retrieval technology is more advanced. By now several popular image retrieval technology introduction, pointed out that the principles of these types of image retrieval technology and difficulties, comparative study of the advantages and disadvantages of these three image retrieval technology, so that we can retrieve the image retrieval accuracy further understanding.

With the development of social services, people’s living standards improve further requirements, there is an urgent need for a way to adapt to the complex situation of the new positioning technology. In recent years, RFID technology have a wide range of applications in all aspects of life and production, such as logistics tracking, car alarm, security and other items. The use of RFID technology to locate, it is a new direction in the eyes of the various research institutions and scholars. RFID positioning technology system stability, the error is small and low-cost advantages of its location algorithm is the focus of this study.This article analyzes the layers of RFID technology targeting methods and algorithms. First, RFID common several basic methods are introduced; Secondly, higher accuracy to political network location method; Finally, LANDMARC algorithm will be described. Through this it can be seen that advanced and efficient algorithms play an important role in increasing RFID positioning accuracy aspects.Finally, the algorithm of RFID location technology are summarized, pointing out the deficiencies in the algorithm, and put forward a follow-up study of the requirements, the vision of a better future RFID positioning technology.

Purpose: The aim is to measure and analyze the wave amplitudes and time intervals of differential graphs of reconstructed impedance cardiography (RICG). Methods: 180 adults with normal cardiac function between the ages of 18–78 were included in the study. Six mingled impedance changes on chest surface were simultaneously detected for each subject. The differential graphs of five impedance change components of RICG were obtained through waveform separation and software differentiation. The amplitudes of C, X, O, b waves and time intervals of Q‐b and Q‐C were measured and statistically analyzed. Results: The amplitudes of C and X waves in PL, PR, AO, and that of C, O, b waves in LV and RV, all decrease as age increases. Wave amplitudes of the female group were bigger than those of the male group (p <.01), while the Q‐C intervals of the female group were shorter than that of the male group (p <.01). Among five impedance change components, the wave amplitude of AO was larger than those of PL and PR (p <.01), and wave amplitudes of PL and PR were bigger than those of LV and RV (p <.01). Q‐C intervals of LV and RV were longer than those of AO, PL and PR (p <.01), while the Q‐b intervals of LV and RV were shorter than the Q‐C intervals of AO, PL, and PR. Conclusions: The differential graphs of RICG could reflect indirectly the physiological activities and pathological changes of the heart and of the large blood vessels in thorax. [ABSTRACT FROM AUTHOR]