• It's Smart Media
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• v.3 no.1
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• pp.16-23
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• 2014

• Journal of Korea Society of Industrial Information Systems
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• v.25 no.3
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• pp.31-38
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• 2020

In this paper, we compare and analyze smart technologies and present six obstacle detection features to help visually impaired people walk. Traditionally, visually impaired people walk with the white cane or a guide dog. With the development of IoT technology, various smart walking aids systems have been developed. Those intelligent walking aids systems have obstacle-detecting systems and route-guidance systems. Many researchers are developing the walking aids system, which detects an obstacle and provides the obstacle information by haptic feedback. Also, they are designing the database server system to share the obstacle information. Particularly the composed system can quickly give an obstacle-avoidance route using shared obstacle information. Smart walking aids systems for visually impaired people will advance more rapidly by applying machine learning and intelligent systems.

• Smart Media Journal
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• v.11 no.3
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• pp.39-53
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• 2022

Cloud of Things (CoT) can provide IoT applications with unlimited storage functions and processing power supported by cloud services. However, in a centralized cloud of things, it can create a single point of failure that can lead to bottleneck problems, outages of the CoT network. In this paper, to solve the problem of centralized cloud of things and interoperate between different service domains, we propose an IoT service interoperability system using distributed fog computing and blockchain technology. Distributed fog is used to provide real-time data processing and services in fog systems located at a geographically close distance to IoT devices, and to enable service interoperability between each fog using smart contracts and distributed ledgers of the blockchain. The proposed system provides services within a region close to the distributed fog entrusted with the service from the cloud, and it is possible to access the services of other fogs without going through the cloud even between fogs. In addition, by sharing a service right token issuance information between the cloud and fog nodes using a blockchain network, the integrity of the token can be guaranteed and reliable service interoperability between fog nodes can be performed.

• Journal of Internet of Things and Convergence
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• v.6 no.3
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• pp.45-52
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• 2020

In the paper, we propose a system that measures various agricultural parameters that affect crop yield and monitors location information. According to an analysis by international organizations, 60% of the world's population lives on agriculture. In addition, 11% of the world's soil is used for growing crops. For this reason, agriculture plays an important role in national development. If a problem occurs in agriculture due to weather or environmental problems, it can be a problem for national development. In order to solve these problems, it is important to modernize agriculture using modern IoT technology. It is possible to improve the agricultural environment by applying IoT technology in agriculture to build a smart environment. Through such a smart environment, it is possible to increase the yield of agricultural products, reduce water waste, and prevent overuse of fertilizers. In order to verify the proposed system, an experiment was performed in a soybean cultivation farm. Experimental results showed that using the proposed system, the moisture in the cultivated soil can be automatically maintained at 40%.

• Journal of Digital Contents Society
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• v.19 no.2
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• pp.259-267
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• 2018

In this study, we study the system to remotely transmit musical score based on Internet of Things(IoT). When musicians play music, they occasionally use the instrument and the musical score at the same time. At this time, the degree of immersion in music is reduced. In order to solve this problem, this paper proposes automatic sheet page turning system based on Internet of Things(IoT). The system can be remotely adjusted using the foot without using the hand. The system consists of a Wireless Smart Button equipped with Bluetooth and an application capable of operating the Wireless Smart Button. The Wireless Smart Button used Arduino based open source. We designed an application(App) to utilize it and proposed an intuitive UI.

• Journal of Digital Convergence
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• v.17 no.12
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• pp.219-228
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• 2019

Thanks to the development of information technology and the vitalization of smart services, the Internet of Things (IoT) technology, in which various smart devices are connected to the network, has been continuously developed. In the legacy IoT architecture, data processing has been centralized based on cloud computing, but there are concerns about a single point of failure, end-to-end transmission delay, and security. To solve these problems, it is necessary to apply decentralized blockchain technology to the IoT. However, it is hard for the IoT devices with limited computing power to mine blocks, which consumes a great amount of computing resources. To overcome this difficulty, this paper proposes an IoT architecture based on the edge computing technology that can apply blockchain technology to IoT devices, which lack computing resources. This paper also presents an operaional procedure of blockchain in the edge computing-based IoT architecture.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.1
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• pp.19-32
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• 2013

This paper suggests smart gateway structure and functionalities that provide device web service which can be used by user using objectified devices. The smart gateway objectify a physical device in other to provide the device web service in IoT intelligent service. And the paper suggests a mechanism that provide orchestrated service of various devices to user using a concept of service overlay network. and also suggests a interface that provide device web services and the orchestrated service between the smart gateway and a web service platform. In the paper, the objectified devices can be combined with web service objects and device contexts based on the service overlay network, furthermore the objectified devices can provide intelligence and dynamic service in the IoT environment.

• Review of KIISC
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• v.24 no.5
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• pp.59-65
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• 2014

산업제어시스템과 SCADA(Supervisory Control and Data Acquisition) 제어 시스템들이 기존의 고립적이고 폐쇄적인 시스템에서 점차 개방적이고 표준화된 시스템으로 전환되고 있으며, IT 망과의 통합이 이루어지고 있다. 따라서 주요 국가정보 인프라에 대한 사이버 위협 및 공격에 대한 우려가 증대되고 있다. 산업제어시스템의 정보보호 기술은 일반적인 IT 정보보호 기술과는 특성상 여러 가지 차이점이 존재한다. 국내에서의 산업제어시스템 정보보호 기술에 대한 연구는 아직 미약한 수준이다. 본 논문에서는 국가 주요 정보하부구조를 구성하고 있는 산업제어시스템 중에서 사물인터넷(IoT) 기반 스마트 그리드 시스템의 보안 특성에 대하여 분석하고 보안 쟁점 및 고려사항을 제시하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.263-266
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• 2017

제안하는 스마트 CCTV 방범 서비스란 기존에 정적인 방범 서비스 (CCTV, 비상벨 등)를 보완하기 위해 고안된 서비스이다. 라즈베리파이를 이용하여 RC 카를 제작하여 수동 또는 자동으로 사각지대를 순찰하고 현장의 위험을 자체적으로 판단하고 실시간으로 관리자에게 알려주는 시스템이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.280-283
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• 2020

현재 우리나라에서 스마트팜이 존재하고 있지만, 아직까지는 많은 불편함을 겪고 있다. 따라서 이에 본 논문은 사용자가 IoT를 이용하여 더 편하게 이용하고, 불편함을 최소화 할 수 있는 기술을 서술하여, 사용자에게 부담을 줄이고 더 많은 이득을 챙길 수 있도록 기대한다.