• Nuclear Engineering and Technology
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• 제47권6호
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• pp.729-737
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• 2015

Wireless communication technologies, especially smartphones, have become increasingly common. Wireless technology is widely used in general industry and this trend is also expected to grow with the development of wireless technology. However, wireless technology is not currently applied in any domestic operating nuclear power plants (NPPs) because of the highest priority of the safety policy. Wireless technology is required in operating NPPs, however, in order to improve the emergency responses and work efficiency of the operators and maintenance personnel during its operation. The wired telephone network in domestic NPPs can be simply connected to a wireless local area network to use wireless devices. This design change can improve the ability of the operators and personnel to respond to an emergency situation by using important equipment for a safe shutdown. IEEE 802.11 smartphones (Wi-Fi standard), Internet Protocol (IP) phones, personal digital assistant (PDA) for field work, notebooks used with web cameras, and remote site monitoring tablet PCs for on-site testing may be considered as wireless devices that can be used in domestic operating NPPs. Despite its advantages, wireless technology has only been used during the overhaul period in Korean NPPs due to the electromagnetic influence of sensitive equipment and cyber security problems. This paper presents the electromagnetic verification results from major sensitive equipment after using wireless devices in domestic operating NPPs. It also provides a solution for electromagnetic interference/radio frequency interference (EMI/RFI) from portable and fixed wireless devices with a Wi-Fi communication environment within domestic NPPs.

• 한국항행학회논문지
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• 제18권6호
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• pp.640-647
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• 2014

WBAN 기술은 3 m 이내에 위치한 인체 내부 및 외부 디바이스들을 무선으로 연결하는 근거리 무선통신 기술이다. WBAN 기반의 센서 네트워크를 지원하기 위해서는 WBAN 미들웨어 및 응용서비스를 위한 핵심 기술의 개발이 필요하다. 환자의 생체 정보를 수집하기 위한 장치로는 한백전자에서 출시된 zigbex를 사용하였으며 생체 정보를 수집하기 위한 메시지 구조로 바이오 모듈 메시지를 제안하였다. WBAN 환경을 위한 게이트웨이 설계 및 구현을 위하여 한백전자의 임베디드 시스템인 HBE-empos II를 사용하였으며 WBAN 네트워크를 위한 BNC와 BN를 구현하기 위해서 HBE-ubi-zigbex를 사용하였다. 마지막으로 제안한 센서 게이트웨이를 사용하여 다른 네트워크와 연동이 가능함을 확인 하였다.

• 대한임베디드공학회논문지
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• 제2권1호
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• pp.43-52
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• 2007

IEEE 802.15.4 specification which defines low-rate wireless personal area network(LR-WPAN) has application to home or building automation, remote control and sensing, intelligent management, environmental monitoring, and so on. Recently, it has been considered as an alternative technology to provide multimedia services such as automation via voice recognition, wireless headset and wireless camera for surveillance. In order to evaluate capability of voice traffic on the IEEE 802.15.4 LR-WPAN, we supposed two scenarios, voice traffic only and coexistence of voice and sensing traffic. For both cases we examined delay and packet loss rate in case of with and without acknowledgement, and various beacon period varying with beacon and superframe order values. In LR-WPAN with voice devices only, total 5 voice devices could be applicable and in the other case, i.e., coexisted cases of voice and sensor devices, a voice device was able to coexist with about 60 sensor devices.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2006년도 가을 학술발표논문집 Vol.33 No.2 (D)
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• pp.616-620
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• 2006

IEEE 802.15.4 is designed for low-rate wireless personal area networks (LR_WPAN) and it attempts to provide a low data rate, low power, low cost wireless networking on the device-level communication. In this paper, I have established a realistic environment for the effect of collision in nonbeacon-enabled mode and beacon enabled mode. The data throughput and delivery ratio are investigated as the performance metrics.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.241-244
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• 2005

In this paper, we construct UWB system formed by MIMO(Multi-input Multi-output) antennas using indoor WPAN(Wireless Personal Area Network) channel modeling and analyze the interference among these channels.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2006년도 하계종합학술발표회 논문 초록집
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• pp.341-341
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• 2006

• 한국통신학회:학술대회논문집
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• 한국통신학회 2006년도 하계종합학술발표회 논문 초록집
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• pp.425-425
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• 2006

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.383-385
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• 2007

IEEE 802.15.4 is a standard designed for low rate wireless personal area networks(LR-WPANs). This paper presents the analytical model for to derive the saturation throughput of collision avoidance protocol of IEEE 802.15.4 in ad hoc network. we assume that nodes placed according to a two-dimensional Poisson distribution.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2003년도 가을 학술발표논문집 Vol.30 No.2 (3)
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• pp.418-420
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• 2003

본 논문에서는 무선 근거리 네트워크 (Wireless Personal Area Network : WPAN) 환경에서 Koinonia 라는 새로운 시스템을 제안하고 링크계층에 적응형 계층을 추가하여 구성 및 모델링 함으로써 2.4GHz의 ISM 무선 대역을 이용하여 근거리에 위치한 무선 기기들을 연결하고 음성정보 및 데이타를 전송하는 근거리 무선 네트워크 시스템의 시뮬레이터를 구현 함을 목적으로 하였다.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 추계종합학술대회 논문 초록집
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• pp.298-298
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• 2004