• Journal of Information Processing Systems
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• v.19 no.1
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• pp.89-97
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• 2023

With the growth of Internet-of-Things (IoT) technologies, the number of IoT devices developers need to manage has increased exponentially. Many IoT standards have been proposed to allow those devices to communicate efficiently in day-to-day tasks. However, we lack trusted interworking entities for devices from different standards to collaborate securely. This paper proposes a blockchain platform that bridges multiple heterogeneous IoT platforms to co-exist and interwork. Specifically, we designed an interworking proxy application entity (IPE) implemented as a chaincode in Hyperledger Fabric to collect and process data coming from/to oneM2M and LWM2M architecture. The use of blockchain will guarantee network reliability and data integrity so that cross-standard communications can be audited and processed securely. Based on our evaluation, we show that the interworking between oneM2M and LWM2M through our blockchain platform is feasible. Furthermore, the proposed system can process up to 206 transactions per second with 1,000 running applications, which is about an 87% increase from the previously referenced study.

• Journal of Internet of Things and Convergence
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• v.6 no.3
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• pp.75-80
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• 2020

Recently, the size of the IoT sensor has been decreased and the collecting direction of the IoT sensor for acquiring the data have been changed from 2D to 3D. It makes sensor structure complex. In the fabrication of the complex structure, 3D printing technology has more useful than traditional manufacturing technologies. Among 3D printing technologies, FDM (fused deposition modeling) is a candidate technology to fabricate a small IoT sensor because the price of the machine and the material is cheap. In the FDM process, a 3D shape is made by depositing the melted filament. Recently, the patent of FDM technology is expired and cheat machines are developed based on the open-source. In the FDM process, mechanical properties of a fabricated part is affected by a lots of factors such as the kind of material and process parameters. Among them, infill is affecting the mechanical properties and the production lead time as well. In this work, a new method to optimize the FDM process with the consideration of mechanical property and production lead time was proposed. To verify the method, the fabrications were performed with the different infill rates. The results of tensile tests were analyzed to verify the proposed method.

• Review of KIISC
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• v.24 no.6
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• pp.48-59
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• 2014

M2M(Machine-to-Machine)/IoT(Internet of Things)는 기계 간의 통신 및 사람이 동작하는 디바이스와 기계간의 통신으로 정의하고 있으며 이 기술은 미래 ICT(Information Communication Technologies)의 핵심이 되는 기술이다. 오늘날 정보통신기술의 비약적인 발달로 언제, 어디서나 쉽게 접할 수 있는 사물지능통신(M2M) 또는 사물인터넷(IoT) 시대의 도래를 촉진하고 있지만, 다양한 단말 및 이기종 애플리케이션 등을 활용하기 때문에 발생할 수 있는 보안위협 또한 많을 것으로 예상된다. 본 고에서는 M2M/IoT의 최신동향과 동 환경에서 발생할 수 있는 보안위협들을 정의하고, 실제 사례를 통해 현재 발생하고 있는 보안위협들을 파악한 후 사례별 보안대책을 분석한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.507-509
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• 2018

Recently, the research for IoT technologies has been established actively, however the structure of centralized network has been pointed out as the vulnerable points. To solve these problems such as system load and security vulnerability, the research to introduce block chain technology is needed. In this paper, we propose the network domain for convergence of block chain and IoT platform, and describe the advantages from the convergence and various and applicable fields.

• Journal of Korea Society of Digital Industry and Information Management
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• v.14 no.1
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• pp.1-14
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• 2018

The purpose of this study is to learn the current perception of Total Smart Mirror Display devised with IoT, focused on Hair beauty industry. In detail, this study is to analyze domestic and foreign precedented case studies and conditions of Smart Mirror in beauty industry, and to learn, through survey, the real condition of use of Hair Smart Mirror, which is devised and applied according to the actual state of our country. First, the mean comparison for Total Smart Mirror by gender showed that Function1, Technology 2 and 3 had differences. Second, the mean comparison each by age, external design, function, marketing and technologies showed that Function 4, Marketing 1 to 3, Technology 1 and 3 had differences.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.175-176
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• 2015

본 논문에서는 매년 증가하고 있는 음식물 쓰레기를 줄일 수 있는 방안으로 IoT 개념을 이용하여 음식물 쓰레기의 양에 따른 부과 요금을 실시간 조회 가능하도록 하여 경각심을 갖도록 유도하는 시스템을 개발하였다. 또한, 편리성을 위해 종량제 카드 대신 스마트폰의 NFC를 활용할 수 있게하고, 쓰레기 분류, 쓰레기 버리는 날 등의 정보를 제공하며, 쓰레기의 양을 줄인 가구에게는 관리 부서 정책에 따라 쿠폰 등을 제공할 수 있는 기능을 통해서도 음식물을 줄일 수 있는 동기를 부여하였다.

• Information and Communications Magazine
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• v.32 no.9
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• pp.17-23
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• 2015

This paper presents design methodologies for 5G architecture ensuring lower latency than 4G/LTE. Among various types of 5G use cases discussed in standardization bodies, we believe mobile broadband, massive IoT(Internet of Things) and mission-critical IoT will be the main 5G use cases. In particular, a mission-critical IoT service such as remote controlled machines and connected cars is regarded as one of the most distinguished use cases, and it is indispensable for underlying networks to support sufficiently low latency to support them. We identify three main strategic directions for end-to-end network latency reduction, namely new radio access technologies, distributed/flat network architecture, and intelligent end-to-end network orchestration.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.406-408
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• 2018

도시 구조물의 대형화 고층화 복잡화로 인해 안전관리 어려움이 증가하고 있으며 화재 발생시 인명 및 재산 피해가 급증하고 있다. 이를 해결하기 위해 재난관리에 도시 구조물의 공간정보를 활용하는 필요성이 대두되고 있지만 관련 연구가 미흡한 실정이다. 본 논문에서는 화재 조사, 진압 및 구조 구급 등의 소방활동에 실내 공간정보를 활용하여 다양한 소방활동 서비스를 제공하는 방안을 제안하고자 한다. 해결해야 할 연구 문제와 이를 해결하기 위한 접근 방법 및 접근 방법과 관련된 연구 안건을 자세히 기술한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.373-374
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• 2014

Radio frequency identification system (RFID) is an automatic technology and aids machines or computers to identify objects, record metadata or control individual target through radio waves. Connecting RFID reader to the terminal of Internet, the readers can identify, track and monitor the objects attached with tags globally, automatically, and in real time, if needed. This is the so-called Internet of Things (IoT). RFID is often seen as a prerequisite for the IoT. This paper introduces amd surveyed the technologies of RFID and IoT, discusses the applications and challenges of RFID technology used in IoT.

• Journal of the Korea Society of Computer and Information
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• v.24 no.9
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• pp.35-42
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• 2019

In this paper, we propose an approach to apply network-based moving target defense into Internet of Things (IoT) networks. The IoT is a technology that provides the high interconnectivity of things like electronic devices. However, cyber security risks are expected to increase as the interconnectivity of such devices increases. One recent study demonstrated a man-in-the-middle attack in the statically configured IoT network. In recent years, a new approach to cyber security, called the moving target defense, has emerged as a potential solution to the challenge of static systems. The approach continuously changes system's attack surface to prevent attacks. After analyzing IPv4 / IPv6-based moving target defense schemes and IoT network-related technologies, we present our approach in terms of addressing systems, address mutation techniques, communication models, network configuration, and node mobility. In addition, we summarize the direction of future research in relation to the proposed approach.