• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제5권6호
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• pp.127-134
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• 2016

무선인체센서네트워크(WBSN: Wireless Body Sensor Network)은 일반적으로 무선인체네트워크(WBAN: Wireless Body Area Networks)라고도 불리는데, 일종의 무선센서네트워크(WSN: Wireless Sensor Network)의 응용 중에 하나로, 인간의 신체에 이식되거나 착용하는 형태의 감지노드들로 인체 가까이에 설치된다. WBSN에 설치된 각 노드로부터 측정된 데이터는 싱크 노드에서 인체 상태를 분석하기 위하여 사용되는데, 다른 무선센서네트워크 응용과 마찬가지로 노드와 싱크 노드는 서로 동기화되어야 한다. 무선센터네트워크에서 동작하는 여러시각 동기화 프로토콜이 제안되어왔으나 WBSN에 적용하기에는 부적합하다. 이 논문에서는 WBSN의 특성을 고려하여 새로운 시각 동기화 프로토콜을 제안한다. 제안한 프로토콜은 간단할뿐만 아니라 전력 소모가 작아 네트워크의 수명을 오랫동안 유지할 수 있게 한다. 제안 방안의 성능을 시뮬레이션을 통해 평가하였으며, WBSN에서 구현하기에 적합함을 보였다.

• 센서학회지
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• 제15권5호
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• pp.362-370
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• 2006

The wireless sensor network (WSN) based ECG and body temperature measuring system for ubiquitous health-care were designed and developed. The system was composed of a wireless sensor network node, base station and server computer for the continuous monitoring of ECG signals and body temperatures of patients at home or hospital. ECG signal and body temperature data, important vital signals which are commonly used in clinical and trauma care, were displayed on a graphical user interface (GUI). The data transfer from sensor nodes on patients' body to server computer was accomplished through a base-station connected to a server computer using Zigbee compatible IEEE802.15.4 standard wireless communication. Real-time as well as historical, ECG data of elderly persons or patients, can also be retrieved and played back to assist the diagnosis. The ubiquitous health care system presented in this study can effectively reduce social medical expenses, which will be increased greatly in the coming aging society.

• 한국정보통신학회논문지
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• 제18권8호
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• pp.1961-1972
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• 2014

최근 들어 정보통신기술과 의료기술의 통합에 관한 관심이 증가되면서 센서네트워크를 인체에 적용하고자 하는 WBAN(Wireless Body Area Networks)에 관한 연구가 활발히 진행되고 있다. 기존의 센서네트워크 기술은 WBAN에 이용될 수 있는 가능성을 가지고 있으나, 몇 가지 제약사항을 가지고 있다. 특히 신체의 각 센서는 신체의 각 부분을 관통하여 통신해야 할 가능성이 크므로 자유공간인 센서네트워크와는 상당히 다른 네트워킹 환경을 가진다. 따라서 WBAN에 관한 연구는 기존의 센서네트워크와는 다른 인체의 특성을 고려한 다양한 영역을 연구의 대상으로 하고 있다. 본 연구에서는 기존의 센서네트워크와는 다른 WBAN의 환경적인 특성을 조사하고, WBAN의 개념이 도입된 2001년 전후부터 SLR(Systematic Literature Review)기법을 이용하여 WBAN의 연구 경향을 체계적으로 조사한다. 이에는 연구 분류와 연구자의 특성 등이 포함된다. 조사 결과를 요약하고 향후 연구 과제를 전망한다.

• Journal of Communications and Networks
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• 제13권2호
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• pp.160-166
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• 2011

In u-healthcare services based on wireless body sensor networks, reliable connection is very important as many types of information, including vital signals, are transmitted through the networks. The transmit power requirements are very stringent in the case of in-body networks for implant communication. Furthermore, the wireless link in an in-body environment has a high degree of path loss (e.g., the path loss exponent is around 6.2 for deep tissue). Because of such inherently bad settings of the communication nodes, a multi-hop network topology is preferred in order to meet the transmit power requirements and to increase the battery lifetime of sensor nodes. This will ensure that the live body of a patient receiving the healthcare service has a reduced level of specific absorption ratio (SAR) when exposed to long-lasting radiation. We propose an efficientmethod for delivering delay-intolerant data packets over multiple hops. We consider forward error correction (FEC) in an erasure correction mode and develop a mathematical formulation for packet-level scheduling of delay-intolerant FEC packets over multiple hops. The proposed method can be used as a simple guideline for applications to setting up a topology for a medical body sensor network of each individual patient, which is connected to a remote server for u-healthcare service applications.

• 전자공학회논문지
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• 제49권12호
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• pp.56-63
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• 2012

WBAN은 인체 내부 및 외부에 부착한 디바이스를 무선으로 연결하여 통신하는 근거리 무선통신 기술로 IEEE 802.15.6 TG BAN을 중심으로 물리, 데이터 링크, 네트워크, 응용계층에서 표준화가 진행되고 있다. WBAN 기술은 전력제한 및 생체특성을 반영하여 센서와 지그비 디바이스를 사용하여 에너지 효율적으로 구성한다. 무선 센서 네트워크는 다수의 센서노드와 센서노드가 전송하는 센싱 데이터를 수집하는 싱크노드로 구성된다. 센서노드는 넓은 지역에 정해진 형태 없이 배치되어 프로토콜에 의해 자가구성 능력을 가진다. 싱크노드는 고정 싱크노드와 모바일 싱크노드로 구분되고 모바일 싱크노드는 전체 네트워크의 에너지 소모를 분산시켜 고정싱크 노드보다 네트워크의 라이프 타임이 증가하는 장점이 있다. 센서노드의 제한된 에너지 자원은 WBAN의 에너지 효율측면에서 중요한 문제이다. 본 논문에서는 모바일 싱크노드 기반의 WBAN 환경에서 효율적인 데이터 전송을 위한 클러스터 토폴로지 알고리즘을 제안한다. 제안한 알고리즘은 그리드 기반의 라우팅 프로토콜 및 TDMA 기반의 스케줄링 알고리즘의 장점을 바탕으로 인접한 클러스터의 중첩영역을 최소화하고 클러스터 헤더의 데이터 부담을 감소시켜 수집지연 및 오버헤드가 빈번하게 발생하는 WBAN 환경의 무선 센서 네트워크에서 우수한 성능을 보였다.

• Journal of information and communication convergence engineering
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• 제4권2호
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• pp.67-70
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• 2006

A distributed healthcare monitoring system prototype for clinical and trauma patients was developed, using wireless sensor network node. The proposed system aimed to measure various vital physiological health parameters like ECG and body temperature of patients and elderly persons, and transfer his/her health status wirelessly in Ad-hoc network to remote base station which was connected to doctor's PDA/PC or to a hospital's main Server using wireless sensor node. The system also aims to save the cost of healthcare facility for patients and the operating power of the system because sensor network is deployed widely and the distance from sensor to base station was shorter than in general centralized system. The wireless data communication will follow IEEE 802.15.4 frequency communication with ad-hoc routing thus enabling every motes attached to patients, to form a wireless data network to send data to base-station, providing mobility and convenience to the users in home environment.

• International Journal of Advanced Culture Technology
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• 제5권2호
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• pp.98-105
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• 2017

Smartphones are fast growing in the IT market and are the most influential devices in our daily life. Smartphones are being studied for their use in body sensor networks with excellent processing power and wireless communication technology. In this paper, we propose a coordinator design that provides data collection, classification, and display using based on Android-smartphone in multiple sensor nodes. The coordinator collects data of sensor nodes that measure biological patterns using wireless communication technologies such as Bluetooth and NFC. The coordinator constructs a network using a multiple-level scheduling algorithm for efficient data collection at multiple sensor nodes. Also, to support different protocols between heterogeneous sensors, a data sheet recording wireless communication protocol information is used. The designed coordinator used Arduino to test the performance of multiple sensor node environments.

• International journal of advanced smart convergence
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• 제5권1호
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• pp.1-7
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• 2016

Recently, introduced a cloud computing technology to the IT industry, smart phones, it has become possible connection between mobility terminal such as a tablet PC. For dissemination and popularization of movable wireless terminal, the same operation have focused on a viable mobile cloud in various terminal. Also, it evolved Wireless Sensor Network(WSN) technology, utilizing a Body Sensor Network(BSN), which research is underway to build large Ubiquitous Sensor Network(USN). BSN is based on large-scale sensor networks, it integrates the state information of the patient's body, it has been the need to build a managed system. Also, by transferring the acquired sensor information to HIS(Hospital Information System), there is a need to frequently monitor the condition of the patient. Therefore, In this paper, possible sensor information exchange between terminals in a mobile cloud environment, by integrating the data obtained by the body sensor HIS and interoperable data DBaaS (DataBase as a Service) it will provide a base of mBodyCloud System. Therefore, to provide an integrated protocol to include the sensor data to a standard HL7(Health Level7) medical information data.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권5호
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• pp.1077-1093
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• 2013

This paper proposes a new network coordinator node design to select the most suitable wireless technology for WBANs by using fuzzy logic. Its goal is to select a wireless communication technology available considering the user/application requirements and network conditions. A WBAN is composed of a set of sensors placed in, on, or around human body, which monitors the human body functions and the surrounding environment. In an effort to send sensor readings from human body to medical center or a station, a WBAN needs to stay connected to a local or a wide area network by using various wireless communication technologies. Nowadays, several wireless networking technologies may be utilized in WLANs and/or WANs each of which is capable of sending WBAN sensor readings to the desired destination. Therefore, choosing the best serving wireless communications technology has critical importance to provide quality of service support and cost efficient connections for WBAN users. In this work, we have developed, modeled, and simulated some networking scenarios utilizing our fuzzy logic-based NCN by using OPNET and MATLAB. Besides, we have compared our proposed fuzzy logic based algorithm with widely used RSSI-based AP selection algorithm. The results obtained from the simulations show that the proposed approach provides appropriate outcomes for both the WBAN users and the overall network.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.95-97
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• 2005

This paper deals with the implementation of walking for a humanoid robot by ZMP measurement using wireless sensor network. ZMP is measured by FSR sensors which are mounted at each corner of a sole. The wireless sensor network collects the sensor data according and exchanges robot information between host PC and a robot system. The master controller mounted on robot body receives trajectory data from the host PC via sensor network and drives the joint motor based on trajectory data. The time scheduler of the master controller controls the events at the ratio of 100ms. With this configuration, the walking of the humanoid robot KHR-1 could be realized successfully.