• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.496-498
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• 2016

The current domestic subway has been conducting specialized transportation seats, aimed at whomever wish to use metro not only for vulnerable and disabled people but also for 'pregnant women', which mostly concerns for women during their pregnancy. However so far, such measures have not shown to be effective enough for the community to consider pregnant women as 'weaker transportation users'. Therefore, this paper announces a new seat arrangement system proposal for these specialized seats to be exerting advantageous influences for pregnant women. The grounds for this proposal are using "Hybrid Beacon", which is a short-range communication technology, and combining this to the Mobile Application. The proposal starts with observing the current problem related to the specialized seats for pregnancy, and follows by the concept of the system and the scenario.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.610-613
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• 2013

Vehicular Ad Hoc NETwork (VANET), a subclass of Mobile Ah Hoc NETwork (MANET) has been a tech-buzz for the last couple of decades. VANET, yet not deployed, promises the ease, comfort, and safety to both drivers and passengers once deployed. The by far most important factor in successful VANET application is the data dissemination scheme. Such data includes scheduled beacons that contain whereabouts information of vehicles. In this paper, we aim at regularly broadcasted beacons and devise an algorithm to disseminate the beacon information up to a maximum distance and alleviate the broadcast storm problem at the same time. According to the proposed scheme, a vehicle before re-broadcasting a beacon, takes into account the current vehicular density in its neighborhood. The re-broadcasters are chosen away from the source of the beacon and among the candidate re-broadcasters, if the density in the neighborhood is high, then the candidate rebroadcaster re-broadcasts the beacon with high probability and with low probability, otherwise. We also performed thorough simulations of our algorithms and the results are sound according to the expectations.

• Journal of Institute of Control, Robotics and Systems
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• v.19 no.2
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• pp.119-124
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• 2013

Recent increasing demand on the indoor localization requires more advanced and hybrid technology. This paper proposes an application of the hybrid indoor localization method based on a position-coded pattern that can be used with other existing indoor localization techniques such as vision, beacon, or landmark technique. To reduce the pattern-recognition error rate, the error detection and correction algorithm was applied based on Hamming code. The indoor localization experiments based on the proposed algorithm were performed by using a QCIF-grade CMOS sensor and a position-coded pattern with an area of $1.7{\times}1.7mm^2$. The experiments have shown that the position recognition error ratio was less than 0.9 % with 0.4 mm localization accuracy. The results suggest that the proposed method could be feasibly applied for the localization of the indoor mobile service robots.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.243-245
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• 2021

Existing beacons are suitable for providing untact services, but they have the disadvantage of difficulty in accurate indoor positioning because the deviation in signal strength increases depending on the environment. In general, trilateration technique can reduce deviation, but if the distance between beacons is quite irregular, it becomes difficult to apply the algorithm. Therefore, in this paper, we studied how to reduce the signal power measurement error between beacons. First, we transformed the distance measurement formula using RSSI, assuming that the TX values were the same. In addition, we compared measurement errors with existing beacons by searching beacons with beacons scanner applications implemented with Android. As a result, it was confirmed that if a certain distance was further away, the measurement was measured more accurately than the non-changing beacon. Through this, accurate indoor positioning will be possible even in various disability situations. It is also expected that there will be more cases of establishing services that combine beacon with non-face-to-face services.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.10
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• pp.2088-2096
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• 2009

This paper deals with hybrid MAC protocol design for underwater acoustic networks. The proposed MAC protocol has the cluster structure with a master node and slave nodes, and the hybrid network structure that combines a contention free period based on TDMA(Time Division Multiple Access) with a contention period. The suggested MAC protocol has a beacon packet for supervising network, a guard period between time slots for packet collision, time tag for estimation of propagation delay with a master node, the time synchronization of nodes, entering and leaving of network, and the communication method among nodes. In this paper, we adapt the proposed hybrid MAC protocol to AUV network, that is the representative mobile device of underwater acoustic network, and verify this protocol is applicable in real underwater acoustic network environment.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.163-165
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• 2002

현재 가장 중요하고 대중적인 통신수단으로 인식되고 있는 인터넷은 VoIP 기술을 이용하여 전화통신을 지원할 수 있게 되었다 VoIP 기술의 두드러진 장점은 기존의 인터넷망에 대해 추가적인 수정없이 음성전화 서비스를 통합함으로써 회선비용을 크게 절감하고, 단말의 이동성을 지원한다는 것이다. 이러한 장점으로 인해 VoIP는 향후의 네트워터에서 핵심 요소로 그 중요성이 점차 증가하고 있다. 본 논문에서는 다양한 VoIP 기술들 중 프로토콜 자체에 개인 이동성 지원이 명시되어 있고, 효과적인 이동호스트의 지원이 가능만 SIP을 기반으로 하여 단말이 이동중에 수신하는 beacon 신호의 감도와 빈도를 저장하여 예상 핸드오버 셀을 결정하는 SS buffer 메커니즘과 SIP server를 이용하여 계층적 이동성을 처리하는 hybrid mode를 갖춘 이동성지원 기법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.403-406
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• 2017

지오펜스와 하이브리드 비콘을 이용한 입원환자 출입관리시스템은 모바일 앱, 관리자는 웹 화면을 이용해 입원 환자들의 병원 출입을 관리하는 시스템이다. 기존의 외출 시스템은 환자가 외출 신청서를 수기로 작성하고 주치의의 허락 하에 외출하는 형태이지만, 신청서 작성 과정을 거치지 않고 무단으로 외출하는 환자의 경우 외출 시점이나 현재 위치 등을 파악하기 어려운 문제가 있다. 무단 외출 환자를 즉각적으로 파악하지 못하는 경우 해당 환자들이 음주 또는 귀원하지 않는 등의 사고의 원인이 되는 문제가 발생할 수 있다. 본 논문에서는 지오펜스와 하이브리드 비콘을 이용해 환자들의 병원 출입 유무의 정확성을 높이고 무단 외출 환자를 즉각적으로 파악하는 방안을 제시한다.

• Journal of Industrial Convergence
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• v.17 no.2
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• pp.15-20
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• 2019

The purpose of this study is to provide customized experience learning service platform that enables consumers to easily search for various content information about on - site experiential learning, exhibitions, events, and culture, and to provide services. To provide customized experiential learning information that meets the requirements of the consumer. Beacon technology implemented through this study is a BLE technology that broadcasts a URL in Eddystone format developed by Google. This means that even if a user does not install a separate application, Making it easier and faster to access. Based on this, when the database of local cultural contents is completed, it will be expanded to the whole country, and it is expected that more diverse and high quality self - directed cultural contents experiential learning activity education programs will be provided to consumers by diversifying contents and expanding the market.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.44 no.5
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• pp.38-48
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• 2007

In ubiquitous environment, sensor networks that sense and transmit surrounding data without human intervention will become more important. If sensors are installed for detecting vehicles and measuring their speed in the road and that real-time information is given to drivers, it will be very effective for enhancing safety and controlling traffic in the road. In this paper, we proposed a new reliable and real-time sensor MAC protocol between AP and sensor nodes in order to provide real-time traffic flow information based on ubiquitous sensor networks. The proposed MAC allocates one TDMA slot for each sensor node on the IEEE 802.15.4 based channel structure, introduces relayed communication for distant sensors, and adopts a frame structure that supports retransmission for the case of errors. In addition, the proposed MAC synchronizes with AP by using beacon and adopts a hybrid tracking mode that supports economic power consumption according to various traffic situations, We implemented a simulator for the proposed MAC by using sim++ and evaluated various performances. The simulation results show that the proposed MAC reduces the power consumption and reveals excellent performance in real-time application systems.

• Land and Housing Review
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• v.7 no.3
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• pp.131-136
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• 2016

The aim of this study was to improve the performance of hybrid energy harvesting block merge the vibrations and the pressure developed in the previous study. The power generation performance of the energy block improved in this manner was measured and compared with the energy performance of the products previously developed. In previous models, the center has placed a piezoelectric, the two sides had arranged a vibration applying electromagnetic inducing type. Improved model was disposed three in a row of three unit modules for one block. We change the design in the following way. That is, a unit module has been placed the upper piezoelectric body, the lower portion were arranged three electron donation. In laboratory conditions, the power generation performance evaluation results of the improved energy block is as follows. Once when the vibration, power generation was determined to 1.066W. When compared with previous studies, and power generation performance is improved up to 235%. When the vibration in a row 5, power generation was determined to 1.830W. When compared with previous studies, the performance is improved to 177%. The purpose of developing a hybrid energy block is intended to produce electricity by the pressure and vibration when a vehicle passes through the energy block installed in the car park the mouth portion. Electricity produced will try to take advantage of for the purpose of operating a guiding beacon and LED signage in the parking lot entrance. Therefore, it is determined that there is a need in the experiment to compare the performance of the power generation in the field.