• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.138-140
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• 2017

현재 여러 기업들에서 자율 출퇴근제 및 자율좌석제를 시행하고 있으나, 이를 관리할 수 있는 시스템이 상용화되지 않고 있다. 이러한 제도를 시행하면서 발생하는 불편함을 해결하기 위해 본 프로젝트는 최근 주목받는 BLE 비콘을 활용한 블루투스 통신으로 모바일 어플리케이션 내에서 실내 위치 기반의 다양한 서비스를 제공하여 기업 및 직원 불편을 해소하고, 보다 나은 근무 환경과 새로운 형태의 비즈니스 종합편의 플랫폼을 제안한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.326-327
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• 2016

A study on Ontology-based indoor positioning techniques using BLE Beacon. Recently BLE beacon has been widely used as a technique for measuring the indoor location. But it requires a filtering technique for the measurement of the correct position, and uses the most fixed beacon. It is not accurate that calculates the position information through the identification of the beacon signal. Therefore, filtering is important. So it takes a lot of time, position measurement and filtering. Thus, we is to measure the exact position at the indoor using a mobile beacon. The measured beacon signal is composed of an ontology for reuse in the same pattern. RSSI is measured the receiver is the distance of the beacon. And this value configure the location ontology to be normalized by the relationship analysis between the values. The ontology is a method for calculating the position information of the moving beacon. It may be detected fast and accurate indoor position information.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.15 no.1
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• pp.8-13
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• 2022

This paper investigates the method to implement a RF (Radio Frequency) energy harvesting sensor node and to build a sensor network using a CATV network and a leaky coaxial cable. The power supply of a sensor node is designed with the WPTS (Wireless Power Transfer System) receiver operating at 915MHz. A sensor network has limited coverage by the loss of RF signal at a wireless transmission link. The paper proposes to build a sensor network that the BLE signal of a sensor and the signal of a WPTS power transmitter are transmitted through a coaxial cable of a CATV network by utilizing WOC (WiFi over Coax) technology and radiates at a leaky coaxial cable. The length of a leaky coaxial cable and the total loss of a wire link are allowed to the point that the RSSI of a sensor node is more than the minimum value (-78dBm) and lead to extend wireless coverage.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.5
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• pp.1085-1092
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• 2018

Recently, Internet (IoT) and big data have been utilized in various fields such as medical, military and sports. Korea Nazarene University is a rehabilitation-welfare university with about 300 students with disabilities. This paper proposes a smart campus that provides the optimal path for the calculation of the route and risk avoidance using the BLE beacon and the 3-axis acceleration sensor when the students with disabilities move in the campus both indoors and outdoors. So we can manage the big data and sensor-based IoT technology for students with disabilities.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.300-302
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• 2021

Usage of a face mask has become mandatory in many countries after the COVID-19. This paper described to develop a IoT based smart mask system for monitoring face mask. The system developed in this paper has two main units, a sensor module, and a smartphone application. The sensor module consists of four components: temperature and humidity sensor, a heart rate sensor, and a BLE chip. This components work as a unit to collect data and stream them through an I2C port over BLE to a connected mobile device. The smartphone application is an Android application developed for smart phones. It enables the Android device to communicate with the sensor to receive sensor data, process, store and display results.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.1
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• pp.99-106
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• 2017

Audible Pedestrian Signal(APS) is an additional equipment to provide information about pedestrian signals in non-visual formats such as audible tones and verbal messages. It can provide information to pedestrians about the location and directions of a crosswalk, and the traffic signal status. In general, a pedestrian who is visually impaired uses a 358.5MHz wireless remote controller to activate the APS and crosses at the crosswalk with the help of the APS. The existing APS can only receive an activation message from the remote controller. Therefore, the APS has an issue, especially at intersections, that all APSs within the communication range of the remote controller are activated simultaneously. It makes to confuse the visual impaired pedestrians. In this paper, we propose a BLE-enabled APS that can enable two-way communication via Bluetooth with a smartphone. The proposed system solves the problem and provides them with additional information, so that visually impaired pedestrians can cross at the crosswalk more conveniently.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.986-989
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• 2016

본 논문에서는 사물인터넷 기반의 홈/사무실을 구현하기 위해 기존 디지털 도어락에 저전력 통신이 가능한 BLE 모듈을 탑재하고 가상 오브젝트 기반의 게이트웨이를 통하여 스마트 폰으로 제어가 가능한 저전력 지능형 도어락 시스템을 개발함을 목표로 한다. 이 시스템은 사물인터넷 기술을 이용하여 기존의 도어락에 BLE 모듈을 부착하여 라즈베리파이와 서로 저전력 통신이 가능하게 한다. 부가적으로 스마트폰 애플리케이션을 사용하여 원격제어가 가능한 기능도 수행할 수 있다. [1]따라서, 사물인터넷 기반 저전력 디지털 도어락은 일반 가정집 도어락은 물론, 높은 보안을 필요로 하는 장소에까지 다양한 분야에서 효과적이고 편리하게 활용될 수 있을 것이다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.221-222
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• 2015

본 논문은 노약자가 차량들로부터 위험이 되는 구역에 진입하였을 경우, virtual BLE(Bluetooth Low Energy)를 이용해 주변 차량들로부터 안전운전 메시지를 전송함으로써 차량이 안전하게 운전 할 수 있도록 유도하는 모델에 대한 설계를 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.336-339
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• 2015

사물인터넷을 실현하는데 있어서 중요한 역할을 하는 것은 센싱 기술 즉, 감지 기술이다. 이러한 감지 기술 중 널리 사용되고 있는 감지 기술이 블루투스다. 하지만 기존의 블루투스 기술은 전력 소모가 많아 장시간 사용에 많은 어려움이 존재하기 때문에 센서 에는 부적합하다는 단점이 있다. BLE는 기존 블루투스 기술의 단점인 비효율적인 전력 소모를 보완한 기술로, 다양한 기기간의 쌍방향 통신을 무선으로 연결하며 장기간의 배터리 수명을 보장한다. 따라서 본 논문에서는 안드로이드 환경에서 BLE 장치를 제어하기 위한 어플리케이션을 설계한다.

• International Journal of Internet, Broadcasting and Communication
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• v.11 no.1
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• pp.27-38
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• 2019

Sensors collect information for Internet of Things (IoT)-based services. However, indoor construction sites have a poor communication environment and many interfering elements that make it difficult to collect sensor information. In this study, a network was constructed between a Bluetooth Low Energy (BLE)-based IoT device based on a serverless IoT framework and a router. This experimental environment was applied to large- and small-scale indoor construction sites. Experiments were performed to test the communication performance of BLE-based IoT devices and routers at indoor construction sites. An analysis of the received signal strength indication (RSSI) graph patterns collected from the communication between the BLE-based IoT devices and routers for different testbed site situation revealed areas with good communication performance and poor communication performance due to interfering factors. The results confirmed that structural components of the building as well as the materials, equipment, and temporary facilities used in indoor construction interfere with the communication performance. Construction project managers will require improved technical knowledge of IoT, such as optimizing the router placement and matching communication between the router and workers, to improve the communication performance for large-scale indoor construction.