• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.267-269
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• 2018

This paper is a study to solve the malfunction of Fire Detection System and to react swiftly in case of fire. if a fire occurs because of malfunction of the fire receiver, it may not be possible to respond appropriately. in order to solve this problem, Fire Detection System using IoT, the manager studied the method of confirming the fire occurrence with mobile phone Application. We propose a wireless Fire Detection System by building a server and a client using a micom and a mobile phone application. This is to reduce the damage caused by the fire.

• Journal of Internet Computing and Services
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• v.21 no.6
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• pp.95-104
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• 2020

In this paper, we propose the real time indoor air quality monitoring and controlling platform on cloud using IoT sensor data such as PM10, PM2.5, CO2, VOCs, temperature, and humidity which has direct or indirect impact to indoor air quality. The system is connected to air ventilator to manage and optimize the indoor air quality. The proposed system has three main parts; First, IoT data collection service to measure, and collect indoor air quality in real time from IoT sensor network, Second, Big data processing pipeline to process and store the collected data on cloud platform and Finally, Big data analysis and visualization service to give real time insight of indoor air quality on mobile and web application. For the implication of the proposed system, IoT sensor kits are installed on three different public day care center where the indoor pollution can cause serious impact to the health and education of growing kids. Analyzed results are visualized on mobile and web application. The impact of ventilation system to indoor air quality is tested statistically and the result shows the proper optimization of indoor air quality.

• KIPS Transactions on Software and Data Engineering
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• v.5 no.5
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• pp.221-230
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• 2016

With emerging the Internet of Things (IoT) paradigm, the sensor network and sensor platform technologies have been changed according to exploding amount of sensors. Sensor Registry System (SRS) as a sensor platform is a system that registers and manages sensor metadata for consistent semantic interpretation in heterogeneous sensor networks. However, the SRS is unsuitable for the IoT environment. Therefore, this paper proposes sensor registry data model to register and manager sensor information in the IoT environment. We analyze Semantic Sensor Network Ontology (SSNO) for improving the existed SRS, and design metamodel based on the analysis result. We also build tables in a relational database using the designed metamodel, then implement SRS as a web application. This paper applies the SSNO and sensor ontology examples with translating into the proposed model in order to verify the suitability of the proposed sensor registry data model. As the evaluation result, the proposed model shows abundant expression of semantics by comparison with existed models.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.4
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• pp.35-43
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• 2017

In this paper, we propose indoor IoT monitoring system based on visible light communication using smart phone with attracting attentions in recent wireless communication. The main features and contributions of the proposed system developed in this paper are as follows. First, the actual data generated within indoor can be processed via the server by using only the visible light communication. Second, the collected data by using the visible light communication can be monitered by smart phone. Performance evaluation of the proposed system is performed under illumination of the normal fluorescent lamps. We first check successful transmission between transmitting module and receiving module of the data collection system. The monitoring system is tested according to the change of the degree of condensing and distance of the LED and the decoding success rate of the proposed smart phone application. We expect that the proposed system can be applied for indoor and outdoor IoT areas together.

• Journal of the Economic Geographical Society of Korea
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• v.19 no.1
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• pp.18-32
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• 2016

In the Hyper-connected society, each country set up its own policy and central government as well as provincial government makes a basic plan of developing IoT. Gyeonggi provincial government needs to cope actively with the changing international and national circumstances. The purpose of this paper is to frame policy as a provincial government with analysis IoT industry-academia-institute-governments ecosystem and in-depth interview. There are IoT related SMEs in Gyeonggi, especially manufacturing business and device fields. Universities are doing IoT researches by R&D funds from central as well as provincial governments. Central government-affiliated Institutions are researching. It is necessary for Gyeonggi provincial government to establish policy in order to actively operate IoT ecosystem while each innovation actors are cooperated in doing IoT; system/governce maintenance, environments and test-bed for the application.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.525-527
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• 2018

Recently, the risk of a safety accident for all children under seven years of age or kindergarten is on the rise. Therefore, we designed the system to inform the receiver of the safety situations generated when entering or exiting the school bus using the body's pressure, GPS, and IR through IoT. In addtion, The system is also designed so that the teacher can check safety status through the Bluetooth application when an infant enters or leaves the vehicle.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.01a
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• pp.67-70
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• 2017

빅데이터는 인터넷의 발달로 인하여 규모를 가늠할 수 없을 정도로 많은 양의 정보가 생산되어지는 데이터를 말한다. 빅데이터를 활용하는 다양한 사례 중 기업에서 활용된 사례로 사람들의 구매데이터를 분석하여 개인의 구매 취향을 분석한 뒤 구매자가 원하는 제품을 빠르게 안내하는 시스템이 있으며, 정부에서 빅데이터를 활용된 사례로는 사회복지 자금이 대상자들에게 제대로 지급되고 있는지 판단하여 부정수급자를 원천봉쇄 하는 시스템이 있다. 이처럼 빅테이터가 인간의 삶에 긍정적인 영향을 주는 등 다양한 분야에서 활용되고 있는데 본 논문에서는 빅데이터를 이용한 IoT의 활용사례를 알아보고, 긍정적 사례와 부정적인 활용사례를 분석한 뒤 그 발전방향에 대해 제시하고자 한다.

• Journal of Multimedia Information System
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• v.2 no.4
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• pp.327-332
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• 2015

Recently, as microcomputers and sensors have been miniaturized due to dropdown of their market rates, this lead to a favorable environment for implementing the Internet of Things. Smart clothing refers to a system which can be wearable or portable, and allows people to communicate or conduct sensing. Applying the Internet of things, the role of the server computer is to receive and process data obtained from the sensor. An ordinary PC can act as a server but during the implementation of IoT, a PC has limited application due to a large size and the inconvenient portability. This study proposes a model that allows a variety of functions while implementation with the server from the sensing using the Arduino and Raspberry Pi. If we apply this proposed model, everyone can easily and inexpensively experience mobile IoT system.

• Journal of Korea Society of Digital Industry and Information Management
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• v.12 no.1
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• pp.13-26
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• 2016

Service and technology for the future hyper-connected society, which is every information receive through the mobile internet, will be an Internet of Things. Thus, it is mandatory to derive key standardization work item and establish strategy for the global business with the standardization of device and service platform by the application service. In this study, by analyzing the domestic and international market trends, state of technical development, and standardization of technology, we identified the open platform is the stepping stone for achieving the goal which is establishing the virtuous circulation of IoT ecosystem. Also, we defined emphasized key standardization work item for achieving the open platform are network, server, access authentication, billing system, and software platform. After that, we proposed future strategy direction of standardization. This research could be contribute to the IoT service diffusion by realizing IP communication among low power wireless terminals and implementing light-weight standard internet protocol.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.135-136
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• 2018

CoAP을 사용하는 IoT 기기는 핸드오버를 시행하는 동안 주기적으로 보내야 하는 메시지를 보내지 않고 메모리에 저장한다. 그로 인한 경량 IoT 기기의 메모리 요구량의 감소를 위한 핸드오버 절차를 제안한다. 제안하는 절차에서는 센서 노드가 핸드오버 이전에 현재 기지국에 미리 핸드오버 요청을 보낸다. 따라서 센서 노드가 이웃한 기지국에게 핸드오버 요청을 했을 때, 이웃한 기지국은 현재 기지국에게 핸드오버 알림을 주지 않는다. 본 연구에서는 시뮬레이션을 통하여 제안하는 핸드오버 절차로 인한 observe 메시지의 메모리 점유율을 50%가량 줄인다.