• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.388-390
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• 2002

블루투스(Bluetooth) 스캐터넷(Scatternet)은 2개 이상의 피코넷(Piconet)을 연결함으로 구성되는 애드혹(ad hoc)네트웍이다. 피코넷은 하나의 마스터(Master)노드와 다수의 슬레이브(Slave)노드로 구성되는데 이때 마스터 노드는 슬레이브노드에 비해서 더 큰 파워를 소모하게 된다. 따라서 파워를 고려하러 블루투스 피코넷의 마스터를 선출한다면 피코넷의 수명을 늘릴 수 있을 뿐 아니라 전체 스캐터넷의 수명을 늘릴 수 있게 된다. 따라서 본 논문에서는 파워를 고려한 피코넷 마스터 선출 알고리즘을 제안하고 더 나아가서 망이 한번 구성된 이후에도 파워를 고려해서 마스터를 재선출할 것을 제안한다.

• Journal of Institute of Control, Robotics and Systems
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• v.10 no.11
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• pp.1052-1057
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• 2004

Bluetooth technology is essentially a method for wireless connectivity of a diverse set of devices ranging from PDAs, mobile phone, notebook computers, to another equipments, The bluetooth system both point-to point connection and point-to multipoint connection. In point-to multipoint connection, the channel is shared among several bluetooth devices. Two or more devices sharing the same channel form a piconet. There one master device and up to seven active slave devices in a piconet. The radio operates in the unlicensed 2.45GHz ISM band. This allows users who travel world-wide to use bluetooth equipments anywhere. Since the link is based on frequency-hop spread spectrum, multiple channels can exist at the same time. The bluetooth standard ha s been suggested that bluetooth equipments can be used in the short-range, maximum 100 meters. It has been defined that the time takes to setup and establish a bluetooth connection among devices is 10 seconds. It is a long time and may be a cause to lose a chance of finding other non-fixed devices. We propose a routing protocols for scatternets which can be used to control a mobile units(MUs) in this network. The proposed routing protocol is composed of two kinds of bluetooth information, access point(AP) and MU.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.486-486
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• 2006

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.96-96
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• 2004

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.183-186
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• 2003

기존의 스캐터넷 형성 알고리즘은 스캐터넷의 초기 형성에 있어서는 알고리즘을 제공하고 있으나, 다중 스캐터넷 환경에서 기기가 다른 스캐터넷으로 이동하거나 탈퇴 할 경우 의도하지 않은 기기들의 연결 종료에 대한 재구성 알고리즘으로는 비교적 많은 시간이 소모되어 효과적이지 못하다. 본 논문에서는 블루투스 기기들의 이동이나 탈퇴로 인한 스캐터넷의 변화에 대해 효과적으로 재구성하는 알고리즘을 제안한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.6
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• pp.1309-1316
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• 2018

Cattle estrus detection system based on Internet of Things is designed and implemented by using Arduino pro-mini, gyroscope, acceleration sensor, bluetooth master and slave module. The implemented system measures cattle's moving and the measured data are transmitted to the computer connected to RX module by bluetooth TX module. They are plotted in 2-dimensional graph on the computer monitor and the number of transition at each sensor axis are calculated from the graph. The detected and gathered data from the system are analyzed by the proposed algorithm to decide which cows are in the estrus or not. The method to apply bluetooth scatternet is shown and the proposed system can be used to increase the success rate of artificial insemination in normal estrus by detecting the cow's behaviors such as the number of jumping. In this paper, the implemented cattle behavior detecting the system(TX module) are strapped on cattle's leg and it measures the cattle behaviors for determining where that a cattle is estrus or not by the proposed algorithm.

• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.337-339
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• 2005

The demand for a real-time image surveillance system using network camera server is increasing as the network infra has been grown and digital video compression techniques have been developed. The image surveillance system using network camera server has several merits compared to existing real-time image surveillance system using CCTV. It would be more convenient if wireless realtime image transmission were possible. In this paper, a bluetooth module is designed and implemented for a real-time image surveillance system to send and receive informations wirelessly. It may simplify the system development procedures and increase the productivity by low power consumption, low cost, and simple wireless installation. A scatter-net formation is proposed using dynamic and distributed algorithm so that the network connection is reliable.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.3B
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• pp.112-122
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• 2008

Basing on Piconet, The Bluetooth System forms network and transmits data. There is one Master and maximum 7 Slave bluetooth devices in one piconet. A job scheduler performed by Master bluetooth device, gives the chance of data transmission to Slave bluetooth devices, which connected to Master, using polling method in piconet. The maximum data rate is 723.2 kb/s when it uses ACL link with DH5 packet type in a piconet which is constructed by two bluetooth devices. However, if there are one master and two slave devices in a piconet, then the maximum data rate is reduced to a half(361.6kb/s), because a master device has to support same data rate for all connected devices. And, there is the defect in scatternet when data transmission rate becomes low(Maximum rate: 302.2kb/s). This paper proposals the new ad-hoc network topology called "DoublePico"for overcome the low data transmission in scatternet which is constructed by piconets. The method of doublepico that represented in this paper makes high data transfer rate(Maximum rate: 457.57kb/s) in bluetooth ad-hoc networks.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.7
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• pp.1262-1268
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• 2016

Bluetooth has been developed to be applied over the course of several versions in different environments. Especially low is moving to address the constraints, it gives a high utilization rate is faster than the Zigbee wireless LAN communication. To gather information on children's environmental copper transition to multiple versions. There is one limitation of Bluetooth requirements to effectively apply the information collected by Bluetooth. At the same time need to collect several information actions, Bluetooth can not connect to one of only seven Slave Master. In this paper, in order to take advantage of the many benefits of Bluetooth to gather the information by operating the Bluetooth operates in Beacon deliver packets of 168 bits, and the pairing between the master and slave unnecessarily generate a regular signal a large number of connections simultaneously Information We consider how to apply the effective policy that can be collected.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.448-450
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• 2001

블루투스는 저렴한 칩 가격과 간섭에 강한 특성을 바탕으로 휴대폰, PDA, 노트북 등 모바일 디바이스를 주요 대상으로 하는 좁은 범위의(short-range) 무선 ad-hoc 네트워크를 구성하기 위한 유력한 기술로 떠오르고 있다. 블루투스는 대부분의 무선 ad-hoc 네트워크 기술들이 단일 채널의 방송 기반 (broadcast based) 방식에 바탕을 두고 있는 것과는 달리, 주파수 호핑(frequency-hopping)을 기반으로 하는 다중 채널 방식에 바탕을 두고 있다. 그러므로 각각의 채널을 서로 연결하여 스캐터넷 (scatternet)이라고 하는 하나의 네트워크를 형성하게 되는데, 이 때 각 채널을 연결하는 방법에 따라 다양한 형태의 스캐터넷을 형성할 수 있다. 현재 발표되어 있는 스캐터넷 형성 정책들은 모바일 환경에 대한 고려가 부족하여, 노드들의 이동이 빈번한 모바일 환경을 효과적으로 지원하지 못하고 있다. 본 논문에서는 각 노드들이 빈번하게 스캐터넷에 추가되고 삭제되는 모바일 환경에서 정화하고 효과적으로 스캐터넷을 형성할 수 있는 정책을 제시한다.