• Title, Summary, Keyword: Bluetooth

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Bluetooth Scatternet formation and performance (블루투스 스캐터넷의 형태에 따른 성능 분석)

  • 강형구;강석진;차정근;고진환
    • Proceedings of the Korean Information Science Society Conference
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    • pp.358-360
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    • 2002
  • Bluetooth는 기기들간에 고정된 제어 장치를 갖지 않고 각각의 이동 기기가 스스로piconet 이라는 불리는 네트워크를 구성하게 되고, 이 piconet을 확장하여 scatternet을 구성하게된다. 이 scatternet의 형태는 Bluetooth 망 전체 성능에 큰 영향을 미치게 되는데. 본 논문에서는 지금까지 제시된 scatternet의 구성 방법들을 알아보고 scatternet을 구성하기 위해 piconet간에 공유되는 bridge 노드의 숫자를 2개까지 늘려서 원활한 통신과 안정적인 망 구성을 위한 방안을 제시한다. 또한, 성능 분석을 위하여 Bluetooth 전문 시뮬레이터인 IBM의 BlueHoc을 사용하여 bridge 노드수와 scatternet을 구성하는 piconet수의 변화에 따른scatternet의 성능을 모의 실험을 통해 측정하여 보았다.

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Study on the Transmission of Medical Information using Bluetooth Technology (블루투스를 이용한 의료정보 신호의 전송에 관한 연구)

  • 엄정규;김영길
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.520-523
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    • 2001
  • In this paper, a system that transmits ECG signals which get from hand baggage ECG is implemented by using Bluetooth technology. Bluetooth technology is a close range wireless communication used wireless frequency 2.4GHZ bandwidth. This technology consumes very small power and provides high reliability also self error correction with high speed frequency hopping. Because every device which uses Bluetooth protocol can communicate each other. These can connect between the system implemented and any devices such as mobile telephone with Bluetooth module, notebook, and the personal mobile device. Also, the paper proposes capability of transmission to the sever of hospital through each type of wireless communication device that acquired medical information signals in mobile medical machine. The system consists of hardware parts with Bluetooth module and host part, and software parts with bluetooth protocol stacks. The host precesses a connection with other device and transmits ECG signals with bluetooth frequency hopping sequence.

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Transmitting/Receiving of Standard Health Data Using Bluetooth HDP on the Android Platform (안드로이드에서 블루투스 HDP를 이용한 표준건강정보의 송수신)

  • Park, Young-Jin;Cho, Hui-Sup;Son, Jong-Wuk
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38C no.5
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    • pp.464-470
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    • 2013
  • These days, with increasing interest about the health care, research about standard for transmitting/receiving data of health device has been actively conducted. Standardization and testing / certification is underway through the IEEE 11073 PHD, Health Level Seven and the Continua Health Alliance, it'll continue to be more research and experiments in the future. In this paper, we introduce the IEEE 11073 PHD standards for exchange of remote health information and the Bluetooth Health Device Profile(HDP) for health device profile of the Bluetooth technology, also we conducted experiments about exchange health information between health device and smart device which are adapted the IEEE 11073 PHD and Bluetooth HDP. Transmitting/receiving of the IEEE 11073 PHD standard protocol using the Bluetooth HDP profile between health device and smart device can be known by this experiment, and it expect to implement variety of remote medical services through health device supporting these standards in future.

The hybrid method of Listen-Before-Talk and Adaptive Frequency Hopping for coexistence of Bluetooth and WLAN (블루투스 및 무선 LAN 시스템의 동시지원을 위해 Listen-Before-Talk 기법을 결합한 Adaptive Frequency Hopping 방식의 제안)

  • ;Bin Zhen
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.7B
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    • pp.706-718
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    • 2002
  • In bluetooth system, there are two kinds of interference. One is the frequency static interference, for example 802.11 direct sequence, the interferer uses fixed frequency band. Another is frequency dynamic interference, for example other piconets or 802.11 frequency hopping, the interferer uses dynamic frequency channel and cant be estimated. In this paper we introduce a novel solution of hybrid method of Listen-Before-Talk (LBT) and Adaptive Frequency Hopping (AFH) to address the coexistence of bluetooth and Direct Sequence of wireless local area network (WLAN). Before any bluetooth packet transmission, in the turn around time of the current slot, both the sender and receiver sense the channel whether there is any transmission going on or not. If the channel is busy, packet transmission is withdrawn until another chance. This is the LBT in Bluetooth. Because of asymmetry sense ability of WLAN and bluetooth, AFH is introduced to combat the left front-edge packet collisions. In monitor period of AFH, LBT is performed to label the channels with static interference. Then, all the labeled noisy channels are not used in the followed bluetooth frequency hopping. In this way, both the frequency dynamic and frequency static interference are effectively mitigated. We evaluate the solution through packet collision analysis and a detail realistic simulation with IP traffic. It turns out that the hybrid method can combat both the frequency dynamic and frequency static interference. The packet collision analysis shows it almost doubles the maximal system aggregate throughput. The realistic simulation shows it has the least packet loss.

Development of Wireless Control System for High Power LED Luminaire Using Bluetooth Wireless Communication and Current Control System (Bluetooth 무선 통신과 전류제어 시스템을 이용한 고전력 LED 등기구의 무선제어 시스템 개발)

  • Lee, Wan-Bum
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.3
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    • pp.66-72
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    • 2016
  • An LED lighting control system was developed to combine information technology and LED lights for efficient management and energy savings. The system can monitor and control the status of an LED luminaire using Bluetooth wireless communication, sensor technology, and smart phones. An LED lighting control circuit was designed using a temperature sensor, illumination sensor, and Bluetooth module with a fuzzy constant-current control circuit. We extended the lifetime and prevented damage to the LED by optimizing the supply current of the LED luminaire based on the heat-generation temperature of $70^{\circ}C$ of an LED heat sink. We also automatically adjusted the ON/OFF time depending on the ambient illumination of the LED luminaire. By allowing easy control of the LED luminaires on a smartphone, we improved the efficiency and achieved energy savings. The control system was validated through experiments for normal operation.

Study on the Security Threats Factors of A Bluetooth Low Energy (저전력 블루투스의 보안 위협 요인들에 관한 연구)

  • Jeon, Jeong Hoo
    • Convergence Security Journal
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    • v.17 no.4
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    • pp.3-9
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    • 2017
  • Recently, Wireless communication has been widely used as a short distance communication medium in various industrial fields as well as communication connection between home appliances due to the appearance of the Internet of Things. And Most commonly used wireless communication media include WiFi, Bluetooth, and NFC. Among them, Bluetooth is widely used for communication between smart devices as well as computer peripheral devices. And Bluetooth in the home network fields is being used to control electronic products. However, since Bluetooth security vulnerabilities are known, more and more attacks are being exploited. As the application range of Bluetooth is expanding, it is necessary to prepare countermeasures accordingly. Therefore, this study investigates the security threat factors of through Bluetooth'attack case and attack technology. And By proposing countermeasures against this problem, we intend to utilize it as data for improving the security of wireless network service in the future.

Design and Implementation of a H.264 Video player based on DirectShow via Bluetooth (블루투스를 이용한 DirectShow기반의 H.264 동영상 플레이어의 설계 및 구현)

  • Park, Tae-Jun;Cho, Tai-Hoon
    • Journal of the Korean Institute of Intelligent Systems
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    • v.19 no.4
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    • pp.493-498
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    • 2009
  • Bluetooth is a popular wireless data transmission method with low power consumption, but it has low data transmission rate. Thus, although many video stream players of a local or network file exist, there have been few players of video stream transmitted via Bluetooth. MPEG-4 AVC/H.264 codec is one of video codecs available with best compression rates for a certain quality, so a H.264 encoder seems to be adequate for video stream to be transmitted via Bluetooth. In this paper, we present a DirectShow filter based player of video stream encoded by H.264 codec, which is transmitted via Bluetooth. Details on the design and implementation of this program are described. Experimental results are shown to demonstrate the validity of the implemented program using various video samples.

Utilization and Optimized Implementation of Format Preserving Encryption Algorithm for IoT and BLE Communications (IoT와 BLE 통신상의 형태보존암호 활용 및 최적화 구현 기법)

  • Lim, Ji-hwan;Kwon, Hyuk-dong;Woo, Jae-min;An, Kyu-hwang;Kim, Do-young;Seo, Hwa-jeong
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.28 no.6
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    • pp.1371-1378
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    • 2018
  • Bluetooth is the key technology in the wireless connection of many Internet of Things (IoT) devices, especially focused on smartphones today. In addition, Bluetooth communication between the IoT device and the user is mainly performed via Bluetooth Low Energy (BLE), but as the Bluetooth technology gradually develops, the security vulnerability of the existing BLE is more prominent. Research on Bluetooth accessibility has been conducted steadily so far, but there is lack of research for data protection in Bluetooth communication. Therefore, in this paper, when sending and receiving data in BLE communication between IoT and users, we propose effective methods for communicating with each other through the Format Preserving Encryption Algorithm (FEA), not the plain text, and measures performance of FEA which is optimized in Arduino and PC.

Analysis of Received Signal Strength Index from Bluetooth Beacons to Develop Proximity Warning Systems for Underground Mines (지하광산용 근접경고시스템 개발을 위한 블루투스 비콘 신호의 수신 강도 분석)

  • Baek, Jieun;Suh, Jangwon;Choi, Yosoon
    • Journal of the Korean Society of Mineral and Energy Resources Engineers
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    • v.55 no.6
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    • pp.604-613
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    • 2018
  • In this study, we analyzed the variations in the received signal strength index (RSSI) measured from Bluetooth beacons based on the strength and propagation direction of Bluetooth low energy (BLE) signal. Using a smartphone, we performed field experiments to investigate RSSI variations in the BLE signal transmitted by non-directional and directional beacons in an amethyst mine. In case of non-directional beacons, as the distance between the Bluetooth beacon and smartphone decreased, the RSSI increases, whereas as the BLE signal strength increased, the RSSI average gradually increased. The mean value of RSSI measured from the directional beacons was changed without relation to the facing angle between the Bluetooth beacon and smartphone. The results of this study can be used as basic data for developing a Bluetooth beacon-based proximity warning system for underground mines.

Comparison of Salinity of Soups on the Use of Bluetooth Salinity Meter at Childcare Centers in Anyang Area (안양지역 어린이집에서의 블루투스 염도계 사용에 따른 국의 염도 비교)

  • Kim, Hye Won;Pie, Jae Eun
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.4
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    • pp.435-443
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    • 2020
  • We analyzed whether the use of the Bluetooth salinity meter could affect the proper level of salinity in childcare centers. This study was conducted on childcare centers that wish to participate in the sodium reduction project (Bluetooth salinity meter using group, BG) and those that did not participate (Bluetooth salinity meter not using group, NG) among childcare centers registered with Center for Children's Foodservice Management in Anyang from January to December 2019. As a result of comparing the salinity and sodium contents of the soup according to whether or not a Bluetooth salinity meter was used, the salinity and sodium contents of BG was significantly lower than that of NG (p < 0.0001). Salinity and sodium contents in soups tended to decrease as the number of use of the Bluetooth salinity meter increased (p = 0.020). In conclusion, Bluetooth salinity meter can be used as a means to induce voluntary salinity control by cookers regarding sodium reduction education at childcare centers.