• 한국전자통신학회논문지
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• 제13권5호
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• pp.1017-1022
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• 2018

본 논문에서는 주택 내의 단독 화재경보기들이 무선통신을 통해 상호 화재 정보를 공유함으로서 심야 시간대의 화재 인지력 저하 문제, 방 간 격벽으로 인한 경보 신호 감쇄 문제를 해소할 수 있는 무선 감응식 주택 단독 화재경보기를 개발하였다. 무선 감응식 화재경보기는 온도 센서와 가스 센서를 기반으로 온도와 $CO_2$ 농도를 감시, 주택의 화재를 감지하고 무선 송수신 모듈 등을 이용하여 다른 방의 단독 무선 경보기들에게 화재 경보를 전송함으로서 신속하고 정확한 화재인지가 가능하도록 설계되었다. 아두이노를 주제어장치로 하는 3개의 무선 감응식 단독화재 경보기의 시작품들이 제작되었으며, 온도 및 가스 시험에서 정확하게 동작함으로서 그 유용성을 확인하였다.

• 한국화재소방학회논문지
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• 제24권2호
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• pp.178-184
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• 2010

본 연구에서는 화재로 인하여 발생되는 연기 또는 열을 무선화재감지기에서 감지하여, 유선이 아닌 무선장치를 이용하여 수신장치까지 전송하고, 이 감지신호를 유선을 통하여 메인서버로 전송하는 유무선통합감지시스템을 제안한다. 또한 무선 열/연감지기, 무선모듈, 펌웨어, 유무선통합수신반 등을 개발하였으며, 유무선장치의 성능과 실용성에 관한 검증을 위하여 송신탑, 주상복합건물, 지하철역사 등에서 실제 현장적용 실험을 수행하였다. 실험결과, 제안한 시스템은 모든 실험대상물에서 정상적으로 동작하였으며 향후 현장적용이 가능함을 확인할 수 있었다.

• 대한의용생체공학회:의공학회지
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• 제27권4호
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• pp.197-202
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• 2006

Devices in current market to perform electrical stimulation therapy of the urinary incontinence frequent in aging women are very much impractical to us ε due to the wired configuration. The present study implemented new wireless device to enhance self as well as in-hospital therapy with the easiest and the most convenient application. The therapy system consisted of two modules, called 'master' and 'slave', communicating with each other by the wireless Bluetooth protocol. The patient controls therapy processes on the master module in hand, transmitting the required informations to operate the slave module placed within her pants with the viginal electrode connected, delivering appropriate electrical stimulation. Wireless communication enabled self therapy with clothes on, leading to a great convenience for the patient. The stimulation output signal was comparable to commercialized products in both waveform and stimulation capacity.

• 한국산업융합학회 논문집
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• 제26권5호
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• pp.867-874
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• 2023

In this paper, a wireless communication-based sensor data monitoring device with an explosion-proof (Exd IIC) case was implemented to enable installation at explosion-risk industrial sites such as plants. In existing industrial plant sites, most of the temperature sensors and vibration and impact sensors are wired up to several kilometers, which takes a lot of time and money to bury long pipes and cables. In addition, there are not many cases where some wireless devices have been applied to actual plant industry sites due to communication quality problems. Therefore, in order to solve this problem, zigbee mesh wireless communication was applied to provide high reliability wireless communication quality to industrial plant sites, and the time and cost incurred in new or additional installation of sensors could be greatly reduced. In particular, in the event of loss or error of some wireless communication devices, the communication network is automatically bypassed or recovered to enable real-time data monitoring.

• 산업경영시스템학회지
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• 제22권51호
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• pp.139-149
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• 1999

Developed in this paper is a prototype extranet using mobile device such as Personal Digital Assistance(PDA) or Handheld PC(HPC). Especially an adjustment transaction system for auto insurance using wireless data communications is described. Using infrastructures such as PCS, Cellular, Private Radio, wireless communications offers tremendous applications in Korea. A survey of such applications is presented in this paper. Also an analysis of currently available infrastructures of wireless communications is described in this paper. The scheme of an adjustment transaction consists of seven steps: (1) get list of adjustment, (2) obtain insurance information, (3) check police record, (4) get an accident record, (5) get bluebook value, (6) examine the car, (7) file report. Comparing with the previous on-line method that spends much time on gathering data, the proposed system guarantees more rapid transaction using wireless communications.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2006년도 하계학술대회
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• pp.39-42
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• 2006

There are various analysis functions(including prediction of path loss, analyzing of capacity and coverage, etc.) of simulation tool to design and optimize the mobile communication network. Its reliability absolutely effects the performance of mobile communication network. Especially as the wireless network highly advancing focused on data service, it more needs to research and develop on the standard establishment of reliability of the simulation tool. Also it is important the systematic research how to improve the reliability of simulation tool. In this paper, to give the concrete process and skill about how to improve reliability, we define the kinds of reliability at first. And then we explain the comparison results between real field measurement data and theoretic simulation data.

• 대한임베디드공학회논문지
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• 제1권2호
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• pp.82-89
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• 2006

It appears that it is possible for us to make a wireless communication of even home-network system within car by integrating with the Ubiquitous such as mobile phone, wireless Internet, GPS and DMB in the future. If the present wireless surroundings within the car are connected with very high-speed wireless network as measurement system for wireless communication surroundings within this car in the future, it will develop the complicated communication conditions such as safe checkup, communication between systems within car, and wireless communication for user entertainment unlike universal communication conditions. Accordingly, there is the necessity of the device that can measure the interference of electric wave, communication speed and communication quality by a kind of each car. This paper aims at making the real measurement device to raise the reliability of each Application for inquiring into the interference about each other in the frequency band used under Telematics surroundings.

• 디지털융복합연구
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• 제12권4호
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• pp.285-291
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• 2014

최근 무선 통신장치들이 매우 빠르게 발전되고 사용자에게 보급되고 있다. 이로 인해서 기존의 유선 네트워크 장치들과 새로운 무선 네트워크 장치들을 통합한 새로운 메쉬 네트워크에 대한 요구가 급속히 발전하고 있다. 이런 유 무선 통합 네트워크 환경에서 자동으로 네트워크를 구성하고, 이런 환경에서 사용자 또는 유 무선 통신장치에 대해 인증서비스를 반드시 제공해야만 한다. 하지만 현실적으로 이런 서비스를 제공하고 있지 못하다. 그러므로 본 논문에서 유 무선 통합 네트워크 환경에서 오픈플로우를 사용해 네트워크를 자동으로 구성하고, 커베로스를 응용한 사용자 인증시스템을 제안하였다. 우리가 제안한 인증시스템은 장치 또는 사용자에 대한 인증서비스를 제공할 수 있을 뿐만 아니라, 비밀성, 무결성 서비스를 제공할 수 있다. 추가로 중간자공격에 대해서도 막을 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권2호
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• pp.483-503
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• 2015

This paper analyzes the optimal user density and power allocation for Device-to-Device (D2D) communication underlaying cellular networks on multiple bands with the target of maximizing the D2D transmission capacity. The entire network is modeled by Poisson point process (PPP) which based on stochastic geometry. Then in order to ensure the outage probabilities of both cellular and D2D communication, a sum capacity optimization problem for D2D system on multiple bands is proposed. Using convex optimization, the optimal D2D density is obtained in closed-form when the D2D transmission power is determined. Next the optimal D2D transmission power is obtained in closed-form when the D2D density is fixed. Based on the former two conclusions, an iterative algorithm for the optimal D2D density and power allocation on multiple bands is proposed. Finally, the simulation results not only demonstrate the D2D performance, density and power on each band are constrained by cellular communication as well as the interference of the entire system, but also verifies the superiority of the proposed algorithm over sorting-based and removal algorithms.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.54-55
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• 2011

To transfer the power wirelessly, the inverter converted DC power to a high frequency MHz-grade AC power. And the ECR devices for wirelessly transmitting the power are required. In this paper, the spiral-type ECR device and the high frequency inverter were designed. The operating frequency is approximately 1.2MHz. In addition, using a vector network analyzer, the 1.2MHz operating characteristics of the ECR device for wireless power transfer module are analyzed. It is performed and reviewed on validity of wireless power transfer technologies through experiments.