• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.05a
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• pp.36-37
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• 2021

OSC(Off-Site Construction) is regarded as a faster and more economical method in the construction industry, and the attention towards the OSC is growing. In the modular construction process, which is one type of OSC, accurate identification of a module is essential. Because the installation position and the MEP(Mechanical, Electrical, and Plumbing) composition are distinct between modules, a defect in the finishing or junction area is likely to happen during the construction process. This study suggested the modular construction process by applying a beacon receiver using BLE(Bluetooth Low Energy) technology on each module. Construction quality management would be improved using the location and assembly data, particularly for a different module in modular construction.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.49-51
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• 2020

인터넷 상거래의 발전으로 온라인 쇼핑몰은 간편 결제와 같은 다양한 페이들을 지원하며 결제방식에 있어서 다양한 방법들을 제공하고 있다. 한편, 경쟁 우위에 있는 다양한 온라인 앱들은 O2O(Online-to-Offline) 서비스를 기반으로 오프라인 매장에도 진출하고 있다. 반면, 기존의 오프라인 사업장을 가진 소상공인들은 ICT 적용과 활용을 위한 개발에 어려움을 겪고 있을 뿐만 아니라 고객 관리와 광고 등에서도 상대적인 열세로 인하여 오프라인 사업장의 수익은 점점 줄어드는 실정이다. 이러한 문제를 해결하기 위하여 본 논문에서는 블루투스 비콘 기술을 사용하여 고객 관리와 광고 등이 가능하며, 오프라인 사업장에도 적용이 가능한 방법을 제안한다. 제안 방법을 통하여 오프라인 매장에서도 온라인 쇼핑몰처럼 관리가 가능하다.

• Information and Communications Magazine
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• v.28 no.7
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• pp.37-43
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• 2011

본 논문에서는 극초단의 임펄스 초광대역 (IR-UWB) 기술을 이용한 실시간 위치 추적 및 위치 인식 응용에 대해 소개한다. 소개되는 임펄스 UWB 시스멤은 임펄스 신호의 크기만을 검출하는 Noncoherent방식을 사용하며, 무선측위 방법은 TDoA 방식을 사용하였다. IR-UWB를 이용한 실시간 위치인식용 태그 칩과 비콘 칩을 제작하여 실제 환경에서 시험하였고, 제안된 시스템은 우수한 무선측위 및 인식성능을 나타내었다. 제안된 기술은 현재 제정 중에 있는 ISO/IEC 24730-6(61) 표준의 주요 항목을 준용하고 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.5
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• pp.1128-1134
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• 2007

Recently, sensor network technology is a highly concerned area due to the expectation of many applications in various fields. The application of sensor network technology to the marine and ocean surveillance and investigation makes the marine environmental research easier since intelligent sensor nodes substitute the human labor work. In ocean sensor network, the localization scheme for the sensor nodes is most essential because all the information without from sensor nodes might be useless unless the positional information of each sensor nodes is provided. In this paper, the localization scheme with mobile beacons in ocean sensor networks is suggested and showed it could be effective for applying to marine circumstances. Even though the previous localization scheme(Ssu's) has advantages that additional hardware is not required for obtaining the information of distance and angle and shows the high accuracy of location and energy efficiency and easy expandability as well, it has also demerits the location error increases as the minimum distance between the absolute positional information become closer. In our works, the improved localization scheme with the presumed area of sensor node using geometric constraints is suggested.

• Smart Media Journal
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• v.5 no.1
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• pp.122-129
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• 2016

In recent years, the Augmented Reality Technology is improving in order to support the user-oriented interaction depending on growing trend in smart phones. In this paper, we present the Realistic Experience App. Contents which help the smart phone users experience the real situations by using the Object Recognition Technology of the tourist attractions and the users' location information. The developed system pinpoints both the location of the user and that of the tourist spot object through the GPS of the smart phone and the information of Beacon, providing the realistic experience contents about the tourist attraction after estimating the distance and the direction between the user and the place. The Realistic Experience App. Contents are expected not only to impress the culture of Jeju on the tourists but also to increase the potential to uncover the unknown tourist attractions and improve the image of Jeju as one of the best sightseeing cities.

• The Journal of the Convergence on Culture Technology
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• v.6 no.4
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• pp.807-812
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• 2020

In order to prevent the national wide spread of the COVID-19 virus, the government enforces to use an electronic access registration system for public facilities to effectively track and manage the spread. Initially, there was a lot of hassle to write a directory, but recently a system for creating an electronic access list using QR codes, what is called KI-Pass, is mainly used. However, the procedure for generating a QR code is somewhat cumbersome. In this paper, we propose a new electronic access registration system that does not require QR code. This system effectively controls the suspicious visitor by using a mask wearing discriminator which has been implemented using deep learning technology, and a non-contact thermometer package. In addition, by linking the beacon, a short-range wireless communication technology, and the visitor's smartphone application, basic information of the facility visitor is automatically registered to KDCA through the server. On the other hand, the user access information registered in the server is encrypted and stored, and is automatically destroyed after up to 4 weeks. This system is expected to be very effective in preventing the spread of other new infectious diseases as well as responding to the coronavirus which is recording a high spread worldwide.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.17-23
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• 2018

The rapid development of mobile technology has increased the use of mobile devices, and the possibility of security incidents is also increasing. The leakage of information through photos is the most representative. Previous methods for preventing this are disadvantageous in that they can not take pictures for other purposes. In this paper, we design and implement a system to prevent information leakage through photos using object recognition and beacon. The system inspects pictures through object recognition based on deep learning and verifies whether security policies are violated. In addition, the location of the mobile device is identified through the beacon and the appropriate rules are applied. Web applications for administrator allow you to set rules for taking photos by location. As soon as a user takes a photo, they apply appropriate rules to the location to automatically detect photos that do not conform to security policies.

• Journal of the Korea Society of Computer and Information
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• v.16 no.4
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• pp.119-126
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• 2011

When ZigBee network supports beacon transmission mechanism, ZigBee devices have the restriction of the transmission range from the coordinator. On the contrary, when it does not support beacon transmission, it is not easy to save the energy through turning into sleep mode. This paper proposes active slot allocation method that allocates a transmission time and does not use the beacon transmission mechanism. It is based on the ZigBee's distributed address assignment mechanism and supports the scalability. This paper explains the active slot structure and the allocation order and describes the operation of ZigBee devices. We verify the proposed mechanism through the simulation and show the performance evaluation. It can be useful on the industrial automation and the environmental surveillance.

• Journal of Digital Convergence
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• v.15 no.5
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• pp.217-223
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• 2017

With the development of sensor networks and Internet of Things (IoT) technology, personalized context information has been collected and customized services can be provided to related users. Currently, the context information system is at the level of analyzing and recognizing user specific behavioral characteristics and generating events.In the IoT environment, IoT products themselves should provide the required services with minimal user intervention, rather than acting for a specific purpose. In this paper, to minimize the user intervention in the IoT environment, we implemented an automatic attendance recognition system using context information from the ECG based on beacon. Environment of provided specific Context information, we compared and analyzed the degree of user intervention among the authentication method using ECG sensor in this paper and the existing authentication method. As a result of the analysis, we confirmed that the system implemented in this paper minimizes user intervention.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.794-797
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• 2015

As the interest in VANET is increased, a study on the beacon message transmission between vehicles is actively being made. IEEE 802.11p/1609.4 standard is based on a multichannel system consisting of multiple service channels (SCH) and a control channel (CCH). Multiple SCHs are defined for nonsafety data transfer, while the CCH is used to broadcast safety messages called beacons and control messages (i.e., service advertisement messages). However, most messages broadcast in the only one CCH belong to safety application that must be contested in dense vehicular network. This paper suggests safety message transfer algorithm in dense vehicular congestion. The proposed algorithm is that the priority of safety messages is decided by decision tree and messages are stored in proper queues according to their priorities. Then, safety messages with higher priorities are sent in turn by CCH in the assigned time. The proposed algorithm decreases the beacon transmission delay and increase on the probability of a successful beacon reception in an IEEE 802.11p/1609.4-based network.