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Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Most of the existing accurate positioning systems for underground personnel adopt UWB positioning technology, which is based on the layout mode of personnel positioning card + positioning substation to achieve centimeter-level high precision positioning. However, the existing models ignore the complexity of the working face environment, the influence of the change of the location of the base station installed with hydraulic support on the positioning accuracy, as well as the difficulty of field installation and other factors. To solve the above problems, a low power consumption positioning system for fully mechanized mining face is designed, which adopts Bluetooth positioning and LoRa wireless technology. The locator is used as a beacon and powered by battery, which can be installed in any position of the working face. Personnel positioning card integrates Bluetooth positioning and LoRa wireless technology, and integrates with mining lamp to form information mining lamp; the substation fusion LoRa wireless module is installed at both ends of the fully mechanized face to collect and transmit location information. The system can be compatible with the existing personnel accurate positioning system, and avoid the problems that the existing technology is difficult to solve in the positioning of fully mechanized mining face. It has the advantages of convenient installation, low cost and easy maintenance.

Abstract： A multi-channel real-time system is designed for monitoring photoplethysmographic (PPG) using RISC-V kernel. The system takes E203 IP of RISC-V architecture as the low-power core, which connects analog front-end module and Bluetooth control module through ICB bus. The analog front-end control module controls back-to-back LEDs to realize two-channel PPG signal acquisition. Multi-channel acquisition can be realized by reusing the analog front-end control module. The Bluetooth control module is connected to E203 to deliver system control commands, and then upload PPG data to the terminal. Finally, The FPGA system verifies the 22-bit dual-channel PPG signal Internet of Things terminal application.

Copyright of Packaging & Food Machinery is the property of Packaging & Food Machinery Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of World Nuclear Geoscience is the property of World Nuclear Geoscience Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In indoor localization, PDR method is one of the most convenient localization methods, but the cumulative error will get larger as the distance traveled increases. The use of Bluetooth peak correction algorithm can effectively reduce the cumulative error of PDR, but the Bluetooth signal has the problem of pseudo-peak and mis-peak in multi-Bluetooth base stations. To address the above problems, this paper proposed a PDR-based Bluetooth peak detection method. The method first calculated the prediction probability based on the PDR position estimation information and Bluetooth distribution information to filter out the closest Bluetooth in the forward direction, thus reducing false peaks. Secondly, it calculated the adaptive threshold based on the change of the signal, thus outputting the switching sate to find the wave peak, to detect the true peak and reduce the false peak. Finally, this paper used an improved Bluetooth peak correction algorithm to correct the PDR position estimation. The experimental results show that the proposed method can achieve a correct peak detection rate of 82.1% on Android smartphones . Compared with the traditional sliding window peak detection method, it can effectively reduce the interference of pseudo-peaks and false peaks, and reduce the cumulative error of PDR. [ABSTRACT FROM AUTHOR]

In view of problems of co-channel interference emerged in wireless communication in coal mine emergency rescue based on Bluetooth transmission, the paper proposes a method of realizing anti-interference using frequency hopping technology. Mine-used vital sign parameter sensors connect with mine-used data acquisition terminals via Bluetooth signals. When the state of the channel is occupied, a vital sign parameter sensor changes the channels through the way of frequency hopping technology controlled by a data acquisition terminal, which searches in progressive increase for unoccupied channels in order according to the table of Bluetooth channel states and transforms the state of these changed channels into the occupied state. The underground test results indicate that this method can distribute terminals to different channels effectively and avoid the situation of co-channel interference at the same time, which enhances the stability of underground emergency communication system and the capability of emergency rescue.

In the 4G era,operators have become data service pipelines,while they will actively seek business transformation in the 5G era.According to research institutes,the indoor positioning and IoT market have broad prospects,and operators are working hard to expand vertical industry applications in related fields.However,the existing indoor communication network has a single function and cannot effectively support indoor positioning and IoT services.A communication,navigation and IoT integration 5G indoor communication network was proposed.By integrating the bluetooth module inside the indoor antenna,it achieved some new functions,such as downlink bluetooth positioning,advertisement information push,path loss detection,uplink IoT collection and uplink bluetooth positioning.The proposed technical solution can be applied to smart medical scenarios,such as smart consultation,equipment management,security management,logistical support and one-click alarm.

In view of problems of high cost of high-precision inertial navigation of underground vehicle and large drift of low-cost MEMS inertial sensor, an underground multi-sensor integrated navigation system was proposed, which uses bluetooth ranging information, MEMS inertial sensor and vehicle odometer information for integrated navigation. The system uses Kalman filter technology to fuse multi-sensor data, combines Bluetooth ranging information to suppress MEMS inertial sensor drift, and improve positioning accuracy of inertial sensor in a period of time; Vehicle position is predicted by MEMS inertial sensor to effectively filter out Bluetooth signal of interference tags, so as to improves data reliability; Integration of odometer data can make the positioning result more stable and reliable. The test results show that the positioning error of every 10 m is less than 3.2 m under the condition that the underground Bluetooth tags are distributed 10 m apart, which can meet requirements of underground navigation.

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Computer Engineering & Applications is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunications Science is the property of Beijing Xintong Media Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Aiming at the problem of safety management of the biomedical laboratory platform, a high-precision and low power indoor and outdoor location tracking system for laboratory items was designed in this paper. The system uses Bluetooth indoor positioning, Global Positioning System and Beidou system to achieve outdoor positioning, and uses acceleration sensors to detect the displacement of items to control system power consumption, and then through the GPRS wireless communication module sends data to the database, completes positioning operation in the database and saves the data. Users can use APP to access the database, check the items location information in real time. Through experimental tests, it is proved that this system can effectively locate and track the laboratory items. [ABSTRACT FROM AUTHOR]

In order to effectively monitor the state of bioelectricity of standing tree, a mobile terminal system was designed to achieve the remote query of the bioelectricity producing situation of trees. The system mainly includes the hypogyny machine system for measurement and collection of bioelectricity signals, bluetooth and GSM systems for wireless remote query, and the PC system of displaying real-time data for further analysis. The system is to transmit to the next bit machine by nails electrode, the sampling circuit, amplifying circuit, A/D conversion circuit and programming interface module, will read the measured data and temporary to STC89 C52 RC MCU in the ROM. The user can transmit the measured real-time data to the mobile phone in the form of a short message by using the instruction-driven MCU on the mobile terminal, realizing real-time monitoring of the data. The in-situ test and application showed that the system can accurately monitor the biological energy data, and the data can be real-time transmitted to the mobile terminal for checking and recording. The system operates steadily and can meet the need of real-time monitor and query of the test data. The system is small, easy to carry and install, the use of modern smart phone terminal convenience, improve the efficiency of living wood biological power data acquisition, and has mobility, rapidity. This paper provides reference for further studies to understand the law of generation, collection, query, storage, and utilization of bioelectricity of trees. [ABSTRACT FROM AUTHOR]

To solve problems of complex wiring, unstable data transmission and difficult maintenance of existing hydraulic support monitoring system in coal mine underground, a pressure monitoring system of hydraulic support based on Ad-Hoc networks was designed. The system can solve complex wiring problem via bluetooth technology to form a wireless Ad-Hoc networks, and adopts bluetooth wireless communication and Ethernet to transmit hydraulic support pressure data with fast transmission rate and stable performance. Staff can real-timely analyze hydraulic support pressure value by use of PC software.

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To improve the poor flexibility and functionality of the heart rate measurement systems，a button-heart rate monitoring system is presented. In this system，the button sensor is closely related to photo plethysmography (PPG) used to collect date about heart rate and pre-process the signals. Microcontroller chip Atmega 328 is used as a core to compute ADC and heart rate and transmit the data to LabVIEW via the bluetooth. Finally，the software of the heart rate monitor is responsible for real-time receiving and monitoring of heart rate signals for a long time. Five persons were selected to test the performance of the heart rate monitoring through repeatedly test by using heart rate monitoring system and artificial method，respectively. The error of heart rate monitoring system was less than 2%. The results show that the system is reliable and realizes the functions of voice prompt， voice alarm， database building，massive data storage. It also has the characteristics of small size，good flexibility，cheap cost，multiple functions，and can be used for long time monitoring and analysis for the users，which has good application prospects in daily life. [ABSTRACT FROM AUTHOR]

The different impact assessments on performance of data transmission of multiple Bluetooth protocol versions were analyzed.Packet selection algorithms,retransmission mechanisms,interference and security were discussed respectively.Strategies,employing extended-golay code and minimum frequency shift keying (MSK) modulation were proposed,which enhanced the probability of anti-interference and throughput of data packet.Moreover,a co-channel interference suppression approach based on channel switching and MSK modulation was proposed,which improved the carrier to interference ratio and throughput in piconets.Finally,the work was summarized and expectations as well as premeditation of the future were presented.

To improve the anti-jamming capability and transmission efficiency of Bluetooth,the retransmission mecha-nism was worked out for baseband layer and L2CAP layer.In baseband layer,the adaptive packet selection strategy was presented,which utilized the times of retransmission to evaluate the channel quality.The packet that satisfied the biggest throughput of the current channel was chosen dynamically according to the times of retransmission.In L2CAP layer,in view of the shortcomings that data frames successfully received need to be transmitted once more,the selective retrans-mission algorithm was proposed,depending on the unique characteristic that Bluetooth could support a number of logical channels.The algorithm combines the retransmission mode and flow control mode,with no redundancy varieties of the protocol.Simulations and performance analysis indicate that system throughput and transmission efficiency get promoted with decrease of communication delay.It is easy to implement the algorithm.

The attack mechanism of bluetooth location privacy and the disadvantages of the current protection scheme were analyzed and a model of hierarchical address was established.On the basis of the model,a protection scheme on bluetooth location privacy was designed.Compared with others,this scheme can not only resist eavesdroping,replay attack,frequency hop sequence attack,conversation address tracking attack,dictionary attack and man in the middle attack,but also need little computing and storage.

A novel chain structure Bluetooth scatternet algorithm for topology formation was presented:all Bluetooth nodes turn into INQUIRY or INQUIRY SCAN states with identical probability,0.5,then set point-to-point connections up simultaneously.As a result,as large as possible numbers of temporary piconets were made up,and furthermore,some larger piconets and groups composed of several piconets were made up through varieties of merging and recomposing repeatedly.Finally,a chain structure scatternet bearing only one group were formed by operating the algorithm after several times.Simulations and performance analysis indicate that the scatternet formed by this algorithm has excellent characteristics:comparably less number of piconets,less average number of roles every node and less number of maximum degree of nodes,shorter networking establishment time,easier to maintain topology dynamically and dispensable for all nodes to be in communication range,etc.The algorithm can be used for Bluetooth scatternet topology formation.

Relations between bit error rate and average received signal-to-noise ratio （SNR） in AWGN channel were derived for three modulation modes defined by Bluetooth 2.0+EDR new specification. The function expressions of packet retransmission probability and average received SNR of ACL packets were put forward. The transmission performances of ACL packets, including average throughput, average retransmission times and average transmission delay, were investigated through the retransmission probabilities and characteristics of packets. The Adaptive packet selection strategy in AWGN channel was presented. The maximum throughput was obtained by selecting the appropriate packet types to transmit in different SNRs. The SNR threshold values for packet type switching were also presented. The analysis results and strategy presented adapt to optimizing Bluetooth data transmission performances.

Portable wireless electronic devices have become an indispensable part of life. In order to make mobile devices more efficient and long-battery life, the article introduces the whole system design method which follows the standard Bluetooth low energy technology for low-IF receiver. It also discusses the design of each module, so that it could achieve the most advanced low-power standard. Finally, the paper determines the required parameters of ADC by the selected system configuration. A minimum ratio and better dynamic range requirements can be fitted to the system. The design can be a reference for complex low-power low-IF receiver. [ABSTRACT FROM AUTHOR]

Aiming at that traditional elevator adjustment method exist adjustor's heavy workload, long adjustment and other defects, and that the wireless elevator adjustment method currently used was limited by the wireless signal transmission distance, elevator control system, elevator car communication, Bluetooth wireless communication, mobile phone Android technology, etc. were studied, the elevator wireless adjustment system based on Bluetooth was proposed. Bluetooth technology and Android phone technology were applied to the elevator adjustment system in the system designed in this paper, Bluetooth module was embedded in the elevator car controller, and then the Android mobile phone connected elevator car controller, so as to achieve the purpose of elevator adjustment. The system was based on BÖHNKE +PARTNER BP304 elevator control system platform,and tested at a height of 2 meters test tower. The results indicate that using the system to adjust elevator, the reaction time of elevator is 25 ms to 50 ms, which is able to meet the requirements of the elevator adjustment. The system has advantages of low cost, high reliability, high flexibility, and displays visual adjustment results. [ABSTRACT FROM AUTHOR]

At present, the pollution of lakes have become very important in China, meanwhile management of lake is very critical. The key is that determines the location of the incident. The paper firstly introduces Bluetooth and RSSI ranging method in the Internet of Things. Then using some CC2540 chips by TI company,it establishes a math function between distance and RSSI coming from moving objects around the lake shore . According to it, a location algorithm is designed. After some experiments, it is high accurate to position anything. [ABSTRACT FROM AUTHOR]

The system designed in this paper acquires data through ECG conditioning circuit and processes the data through low-power MCU MSP430. And then, using ultra-low power ANT protocol data were sent to the PC equipped with an ANT_USB receiver module, or sent to the ANT to Bluetooth module and then forwarded to the mobile android terminal. After the PC or the mobile android terminal receives the data, real-time ECG and heart rate information are displyed, diseases can bed diagnosed, and the diagnostic results can be shown. When the abnormality is detected, an alarm sounds and the data are sent through a TCP / IP network! or the mobile Internet to the remote medical center for timely and accurate diagnosis and treatment. And the terminal application program can easily record, store, query the users information and detection results. [ABSTRACT FROM AUTHOR]

A handset is needed while making phone calls using traditional fixed- line phone. The wire used to connect the handset and the phone significantly restricts the moving of the phone users and thus causes many inconveniences. On the other hand, the cellphone siginal is sometimes very poor or even zero in high-rise buildings or basements. Aiming at these problems, a Bluetooth adapter for fixed-line phone was suggested in this paper. The speaking circuit, ringing circuit and Bluetooth modle circuit were designed. The adapter function was achieved through embedded software programming. With this adapter, all Bluetooth devices e. g. smartphone, PDA, tablet, can be used to make phone calls through the fixed-line phone. [ABSTRACT FROM AUTHOR]

We introduce the bluetooth protocol stack structure and the bluetooth module of mebedded bluetooth protocol stack. We introduce the hardware and software design of this module in small embedded system. The design is validated by experiment. [ABSTRACT FROM AUTHOR]

This paper designs a bluetooth-based low-power multi-parameter monitoring system. The system is mainly composed of ECG signal acquisition, respiratory signal acquisition, body temperature acquisition, bluetooth 4.0 transmission module and Android mobile phone APP display. The system collects the corresponding physiological signals through various collection parts, and can realize the monitoring of three physiological signals of electrocardiogram, respiration and body temperature. The Android mobile APP can display ECG, respiratory waveform and temperature data in real time. The system is small in size and low in power consumption, and has a good application prospect in portable and wearable medical applications.

This study describes the development of a wireless and wearable ECG monitoring system with ultra-low power consumption. The system is mainly composed of a connection part of an ECG electrode sticker, an electrocardiogram collecting part, a data storage part, a Bluetooth main control unit, a charging module, a voltage regulator and a lithium battery. The low-power ECG acquisition chip ADS1292R and the ultra-low-power Bluetooth microcontroller nRF51822 together constitute the ECG signal acquisition and wireless data communication part. The collected ECG signals can be sent to the mobile APP through the Bluetooth function provided by the MCU, and can completly display and analysis to achieve low power system. After testing, the system power consumption is only (3.7 V×2.87 mA)10.619 mW, and if it is optimized, it can further reduce power consumption, therefore, the system design can have good applicability.

This paper designs and implements a low power portable bowel sound monitor, which adopts bone conduction transducer to collect bowel sound continuously for long time and transmit to phone by Bluetooth. Then the phone application can record, play and analyse the bowel sound digital data in real time. This paper also designs an experiment to collect bowel sound from healthy people and patients with intestinal obstruction. It is verified by clinicians that this monitor can accurately record and preserve the bowel sound of the detected people, and is not disturbed by the external environment.

A kind of miniature wireless ECG sensor is designed for mobile medicine in the paper.The miniature wireless ECG sensor acquires ECG signals of human body by single lead,and it transmits the processed ECG data to mobile phone through Bluetooth transmission technology to realize ECG waveform,heart rate display and ECG data storage.The wireless ECG sensor has the advantages of simple operation,high accuracy,strong anti-interference ability and good real-time performance.It can monitor some arrhythmia and other diseases for a long time.

A wireless blood pressure measurement system was designed to facilitate the measurement of the patient's blood pressure and to transmit the measured data safely and reliably. Through PDA, radio frequency identification technology (RFID) and bluetooth technology, the function of reading patients' information and statistics and analysis of blood pressure, heart rate data was realized. The IDEA and RSA joint algorithms were used to encrypt the patients' data and the key of the IDEA algorithm to ensure the security of the patient' data. The test results showed that the system had high accuracy of measurement data, safe and reliable transmission, and improved the nurses' work efficiency.

We designed a multi-functional medical wireless gateway based on Zigbee Bluetooth and WiFi Technology to monitor the medical physiological status of subjects in real time. On the one hand, the gateway acts as the Zigbee coordinator, organizing the Zigbee network and controlling multiple medical digital terminals. On the other hand, the gateway implements a heterogeneous wireless network. It establishes the communication between the medical digital terminals and the host computers or hand-held devices. In addition, we developed a display interface based on the LabVIEW platform, implemented the display and storage of various physiological data on the host computer, and verified the availability of the medical wireless gateway.