• Journal of Technology Innovation
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• v.25 no.3
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• pp.1-24
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• 2017

With the rise of internet of things (IoT), there have been several studies to analyze the technological trend and technological convergence. However, previous work have been relied on the qualitative work that investigate the IoT trend and implication for future business. In response, this study considers the patent information as the proxy measure of technology, and conducts a quantitative and analytic approach for analyzing technological convergence using patent co-classification analysis and text mining. First, this study investigate the characteristics of IoT business, and characterize IoT business into four dimensions: device, network, platform, and services. After this process, total 923 patent classes are classified into four types of IoT technology group. Since most of patent classes are classified into device technology, we developed a co-classification network for both device technology and all technologies. Patent keywords are also extracted and these keywords are also classified into four types: device, network, platform, and services. As a result, technologies for several IoT devices such as sensors, healthcare, and energy management are derived as a main convergence group for the device network. For the total IoT network, base network technology plays a key role to characterize technological convergence in the IoT network, mediating the technological convergence in each application area such as smart healthcare, smart home, and smart grid. This work is expected to effectively be utilized in the technology planning of IoT businesses.

• Electronics and Telecommunications Trends
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• v.32 no.1
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• pp.61-71
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• 2017

최근 ICT 기술 및 생태 환경은 매우 빠르게 변화하고 있으며, 이러한 변화 속에서 가장 주목받고 있는 변화는 초연결 사회를 지향하면서 IoT를 활용한 서비스가 다양한 산업 분야에서 매우 빠르게 변화하고 있는 것이다. 그러나, IoT 환경에서 주고받는 데이터 및 정보가 신뢰받지 못한다면 IoT 서비스는 IoT 서비스 확산에 주요 걸림돌이 되어, ICT 융합 산업의 생태계 조성과 성장 및 신 산업 발굴에 커다란 장애물로 나타나게 될 가능성이 많을 것으로 예상된다. 이러한 위험성으로 인하여, ICT 서비스 산업의 신뢰 기반 인프라 조성은 IoT 기반의 다양한 공유 경제 서비스 실현 및 에너지, 교통, 의료 등 타 산업과의 ICT 융합 실현을 위한 필수 선행 조건으로 대두되고 있고, 이를 뒷받침하는 인프라 기술인 TII(Trusted Information Infrastructure) 기술 개발의 중요성이 증대되고 있다. 본고에서는 ICT 트러스트 정보 인프라(TII) 기술에 대한 국내외 기술 동향과 더불어, ETRI에서 개발하고 있는 TII 기술 및 이를 이용한 응용 서비스 사례, 그리고 표준화 동향 등에 대해 살펴본다.

• Journal of Advanced Navigation Technology
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• v.22 no.5
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• pp.472-477
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• 2018

In this paper, we develop interactive content services for preventing depression of users through an intelligent Internet of Things(IoT) mirror system. For interactive content services, an IoT mirror device measures attention and meditation data from an EEG headset device and also measures facial expression data such as "sad", "angery", "disgust", "neutral", " happy", and "surprise" classified by a multi-layer perceptron algorithm through an webcam. Then, it sends the measured data to an oneM2M-compliant IoT server. Based on the collected data in the IoT server, a machine learning model is built to classify three levels of depression (RED, YELLOW, and GREEN) given by a proposed merge labeling method. It was verified that the k-nearest neighbor (k-NN) model could achieve about 93% of accuracy by experimental results. In addition, according to the classified level, a social network service agent sent a corresponding alert message to the family, friends and social workers. Thus, we were able to provide an interactive content service between users and caregivers.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.4
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• pp.787-796
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• 2019

In this paper, we propose the design and test measure of Ringer injection IoT system for controling the ringer injection status and notifying the server system of the collected status informations such as the completion of injection, the remaining liquid, the injection status, and the emergency alarming of the urgent patients. We design the circuit diagrams composed of linger injection sensors, switches, status indicators, wireless communication functionalities, and propose the controlling and monitoring algorithms for sensing the linger injection status and notifying the collected status informations to a server system. Furthermore, we derive the testing criteria, such as linger liquid sensing time, sensing distance, operating temperature, input power, power consumption, and wireless communication speed, and analyze the test results.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.5
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• pp.616-622
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• 2020

Recently, as the interest in power saving increases with the development of IoT technology, research on power saving of smart devices, which are being miniaturized, is being actively conducted. In particular, due to the diversification of IoT-based smart devices and the increase in personal penetration rate, the issue of standby power even when not in use is increasing. However, there is a drawback of physically unplugging the outlet or turning off the power in order to substantially reduce standby power. Since Zigbee is used instead of the existing IP, it is necessary to change to the IoT standard protocol based on the Internet network. Therefore, this paper designed and implemented the standby power saving system applying CoAP, the IoT standard protocol, to the existing Zigbee technology. Existing systems and evaluations confirmed that the average standby power of about 8.4Wh was reduced.

• Smart Media Journal
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• v.13 no.4
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• pp.76-85
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• 2024

In this paper, we propose a system that improves the data integrity of IoT(Internet of Things) devices in the virtual environment by combining Hyperledger Indy and MQTT(Message Queuing Telemetry Transport). The system complements the limitations of the centralized system by realizing a DPKI(Decentralized Public Key Infrastructure) structure that utilizes a distributed network in publish-subscribe(pub/sub) pattern communication. Digital signature technology was applied to ensure the data integrity of IoT devices and communication scenarios between the four core components of the client, IoT device, broker, and blockchain, as well as a topic structure using a decentralized identifier to ensure safety in the virtual environment. We present a systematic method for transparent data exchange. To prove the performance of the proposed system, this paper conducted experiments on four scenarios and evaluated communication performance in a virtual environment. The experimental results confirmed that the proposed system provides a reliable IoT data communication structure in a virtual environment.

• KNOM Review
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• v.22 no.1
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• pp.30-41
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• 2019

MQTT protocol is one of open Publish / Subscribe systems for IoT information transmission. In this paper, we are proposing an algorithm to assign a subscriber, which dynamically participate in MQTT clustering system, to an appropriate broker. In MQTT systems with a centralized broker, there are losses of connectivity and messages between subscribers and brokers. In this paper, we addressed this issue for developing scalable open IoT systems and consider clustering MQTT brokers on the SDN infrastructure. In particular, this paper focuses on the problem of allocating subscribers to brokers in accordance with sharing brokers' topics to reduce brokers' load and communication cost in SDN based MQTT cluster. The Experimental results show that the proposed algorithm will reduce the load and the cost as compared to existing methods.

• Information and Communications Magazine
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• v.33 no.12
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• pp.12-21
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• 2016

사물인터넷(Internet of Things, IoT) 분야는 모든 기기, 사람, 사물 등이 네트워크로 연결되는 초연결 사회를 지향한다. 이에 반해 전력시스템은 폐쇄망으로 운영되고 있으며, 차세대 전력망이라 일컬어지는 스마트 그리드 환경에서도 개방형 양방향 통신을 기반으로 논의는 되고 있으나, 정보보안 취약성이 높아지고 사고 위험이 증가함에 따라 전력망의 안전성 및 신뢰성 확보에 대한 중요도가 증가하고 있다. 이처럼 초연결 사회를 전력분야에 적용하기 위해서는 적용대상의 정의, 적용방법 등에 대한 기본적인 표준 정립을 통해 IoT 확산 저해요인을 조기에 해소하는 것이 필요하다. 본고에서는 전력 및 에너지 분야에 사물 인터넷을 도입하고 활성화 하기 위해 필요한 에너지 IoT(eIoT) 표준 시스템에 대해 알아본다.

• The Journal of Society for e-Business Studies
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• v.21 no.3
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• pp.1-13
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• 2016

The many researches on context-aware service based on the combination of semantic technology and IoT environment are being actively done. However, the previous study exploiting ontology has limitations not to accommodate the service requirement changes due to ontology prebuilt by specific service scenario. Although the concept of cross vertical ontology has emerged in order to overcome the limitation, it has other limitations that need additional components composing service environment for expressing context information and can't represent state information of environment elements. To cope with these limitations, we propose SISO (Semantic-based IoT Service Ontology) that can represent the states of environmental element without the need for additional context-information element. To verify SISO's characteristics, we select the service scenario and present applied results. The qualitative analysis comparing with the previous study is also presented by the applied results of service scenario.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.234-235
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• 2019

최근 국내 ESS 시장은 정부의 강력한 지원에 힘입어 민간의 투자, 운영 수요가 크게 늘어나고 있으며, 연평균 27% 성장하여 20년 민간 544MWh, 한전 320MWh로 총 864MWh 확대 전망이다. 특히, ESS는 태양광 연계를 통한 매전수익, 피크컷 기능을 통한 전력요금 절감, 독립전원 공급 등 다양한 분야에 활용되고 있다. ESS의 활용이 다양해짐에 따라 PMS/EMS를 통한 PCS제어 및 모니터링 기능, 피크컷 기능이 중요해지고 있다. 이렇듯 사이트 특성에 따른 커스터마이징이 편리한 PMS/EMS IoT 플랫폼 구축이 필요하다. 따라서 본 논문에서는 사이트 특성에 따른 커스터마이징이 편리한 PMS/EMS IoT 플랫폼을 설계하고 개발하였다. 그 결과 운전 스케줄링, 실시간 모니터링, 피크컷, 수익분석, 독립전원 등의 기술이 적용 가능한 PMS/EMS IoT 플랫폼을 통해 최적의 운영으로 수익을 극대화할 것으로 기대한다.