• 정보통신설비학회논문지
• /
• 제2권3호
• /
• pp.61-71
• /
• 2003

본 논문에서는 이동통신망의 SMS 방식을 이용하여 소용량 변전기기인 주상 변압기의 상태를 진단함으로써 발생 가능한 변압기의 사고를 사전에 방지할 수 있는 시스템에 관하여 연구하였다. 변압기의 전류와 온도를 취득하여, 과부하 상태의 값들을 평균과 표준편차로 정리하여 보내는 방식의 무선진단에 적합한 알고리즘 및 프로토콜을 설계하였다. 이동통신망의 SMS방식을 이용하여 유선의 단점인 설치장소에 대한 장애를 없앴다. 또한, 1대의 서버로 많은 수의 변압기를 관리, 제어, 모니터링이 가능하도록 하였다.

• Journal of Information Processing Systems
• /
• 제13권2호
• /
• pp.236-255
• /
• 2017

The rapid growth of smart devices demands an enhanced throughput for network connection sustainability during mobility. However, traditional wireless network architecture suffers from mobility management issues. In order to resolve the traditional mobility management issues, we propose a novel architecture for future wireless access network based on software-defined network (SDN) by using the advantage of network function virtualization (NFV). In this paper, network selection approach (NSA) has been introduced for mobility management that comprises of acquiring the information of the underlying networking devices through the OpenFlow controller, percepts the current network behavior and later the selection of an appropriate action or network. Furthermore, mobility-related scenarios and use cases to analyze the implementation aspects of the proposed architecture are provided. The simulation results confirm that the proposed scenarios have obtained a seamless mobility with enhanced throughput at minimum packet loss as compared to the existing IEEE 802.11 wireless network.

• 정보통신설비학회논문지
• /
• 제5권1호
• /
• pp.13-24
• /
• 2006

This paper proposes a wireless management system for a pet dog using wireless sensor network. The developed intelligent wireless management system is compose of a central control system, auto-feeder, miniguidance robot, and wireless sensing devices. The developed system uses three types of sensed data such as light, temperature, md sounds from a pet dog and surrounded environment respectively. The presented design method using these data provides an efficient way to controlling and monitoring the pet dog. The implemented system can be used as a design framework of portable device for the pet management.

• 정보통신설비학회논문지
• /
• 제7권1호
• /
• pp.1-13
• /
• 2007

This paper proposes a wireless management system for a pet dog using wireless sensor network. The developed intelligent wireless management system is compose of a central control system, auto-feeder, mini-guidance robot, and wireless sensing devices. The developed system uses three types of sensed data such as light, temperature, and sounds from a pet dog and surrounded environment respectively. The presented design method using these data provides an efficient way to controlling and monitoring the pet dog. The implemented system can be used as a design framework of portable device for the pet management.

• 정보통신설비학회논문지
• /
• 제9권4호
• /
• pp.131-140
• /
• 2010

Recently, mobile wireless data traffic has been dramatically increased due to not only the popularization of digital convergence devices including smart phone, Net-book, and Tablet PC, but also the vitalization of wireless Internet related eco-systems such as AppStore. In addition, it is expected that a tremendous increase in mobile data is caused by the release of unlimited mobile data plans (flat-fee). In order to deal with such mobile data traffic explosion, it is necessary that network operators should make efforts to offload wireless data traffic. This paper reviews the condition of mobile wireless data traffic in domestic and international telecommunication industry and looks for various action plans to overcome the difficulty of network operators.

• 정보통신설비학회논문지
• /
• 제8권3호
• /
• pp.116-121
• /
• 2009

A novel method for improving the reliability of sensing data using multi-sensors in wireless sensor network systems is presented in this paper. This method is successfully applied a fog monitoring system in the mountain area.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
• /
• pp.353-356
• /
• 2003

As the wireless mobile telecommunication system has been developed with astonishment, its offering service has also widely been expanded including various data service. Currently, the wireless mobile telecommunication network presents voice service that covers for the most part of the whole service areas. For this reason, the availability of the switching capacity in the mobile switching center(MSC) is manipulated by the required volume of voice service. However, considering the increase of data service, it is desirable for the current switching method to be modified for more efficiency. In this Paper, we analyze the data traffic caused by providing data service in the wireless mobile telecommunication network. For this, we are firstly going to review the result of the analysis in the feature of the data traffic. Secondly, based on the review, we are also going to perform analyzing the other feature of the data traffic normally generated in the wireless mobile telecommunication network. We expect that this paper would be utilized as an elementary source for the feature of the SMS data .traffic and it will be an honour for ourselves to work on it.

• 한국전자파학회논문지
• /
• 제24권2호
• /
• pp.136-143
• /
• 2013

본 논문에서는 통신 철탑 구조물의 정밀한 유지관리를 위해 풍향, 풍속, 기울기 등을 기반으로 하는 서비스를 제공하여 통신 철탑의 안전을 진단할 수 있는 시스템이 구현된다. 이전까지의 통신 철탑 안전 진단은 육안 및 설계 계산상으로만 판단하였으나, 이 시스템을 이용하면 정확한 측정으로 사전 피해 예방을 할 수 있을 뿐만 아니라 관리 측면에서도 효과적이다. 시스템의 센서 노드는 센서부, 제어부, 통신부로 이루어져 있으며, 수집된 데이터는 기지국을 통하여 관리자에게 전달되어 통신 철탑 관리의 효율을 증대한다.

• 정보통신설비학회논문지
• /
• 제4권1호
• /
• pp.37-44
• /
• 2005

본 논문에서는 멀티 코드 CDMA(Code Division Multiple Access)시스템에서 고속의 멀티미디어 서비스를 지원하기 위해 정보 데이터열을 QAM(Quadrature Amplitude Modulation) 부호화하는 방법을 제안한다. 송신 구조는 입력 비트를 정진폭 다중부호 이진직교 변조(Constant amplitude code biorthogonal modulation: 이하 CACB라 칭함)로 부호화하여 전송 심볼의 크기를 일정하게 하고 이렇게 이진화된 신호를 QAM 부호화하여 전송속도를 높인다. 복조기의 구조는 수신된 신호로부터 QAM 연판정기 블록을 거쳐 생성된 신호를 CACB 복호화기를 거쳐 데이터를 복조해 낸다. 제안된 시스템은 기존의 멀티 코드 방식에 비해 대역폭 효율을 크게 개선시킬 수 있어 전송 속도를 많이 향상시킬 수 있고, 멀티 코드 방식을 기반으로 하기 때문에 디지털 가전기기나 3세대 이동통신과, WPAN과 관련된 무선 네트워크 응용과 같은 미래의 고속의 무선 멀티미디어 서비스를 지원하기에 적합하다.

• 정보통신설비학회논문지
• /
• 제3권2호
• /
• pp.81-89
• /
• 2004

In this paper, we describe ubiquitous environments and the trend of convergence that is an evolution path of. current telecommunication, and show the concept of broadband convergence network, service feature and evolution path. In order to converge wire and wireless communication, telecommunication and broadcasting, voice and data efficiently, broadband convergence network divides a network into service layer, control layer, transport layer, ubiquitous access and terminal layer. Broadband convergence network will be a network that can provide and control broadband multimedia services with QoS and security of different and customized level. Then we depict characteristics and types of broadband multimedia service, and describe the characteristic of broadband convergence network. Finally, we show ubiquitous network based on the broadband convert- gence network to provide ubiquitous service which is a future telecommunication service. We also describe requirements of ubiquitous network such as an intelligent and context based platform, convergence terminals, ubi- quitous computing devices, etc.