• Journal of the Korea Convergence Society
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• v.9 no.11
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• pp.99-105
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• 2018

As the Internet of Thing(IoT) technology recently has become a big issue, many researches have been carried out to link the Internet of things with the home network system. Various home network systems are being implemented to connect many devices used in the home with the Internet and to control and operate the devices using a smart phone. However, existing protocols that operate on the Internet are not suitable for a limited environment such as low power, low capacity, and low performance. Therefore, the Internet Engineering Task Force (IETF) Working Group proposed the CoAP/6LoWPAN technology as a suitable protocol for internetworking IoT devices with the Internet in a limited environment and adopting it as a standard. In this paper, a smart home network system is implemented to control and operate various IoT devices in a home using CoAP/6LoWPAN in mobile environment. The performance of HTTP and CoAP such as data transmission time, data transmission rate is analyzed.

• Journal of KIISE
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• v.42 no.11
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• pp.1423-1429
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• 2015

The Internet of Things (IoT) is a new concept associated with the future Internet, and it has recently become a popular concept to build a dynamic, global network infrastructure. However, the deployment of IoT creates difficulties in satisfying different Quality of Service (QoS) requirements and achieving rapid service composition and deployment. In this paper, we propose a new QoS control scheme for IoT systems. The Markov game model is applied in our proposed scheme to effectively allocate IoT resources while maximizing system performance. The results of our study are validated by running a simulation to prove that the proposed scheme can promptly evaluate current IoT situations and select the best action. Thus, our scheme approximates the optimum system performance.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.05a
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• pp.145-148
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• 2018

클라우드 컴퓨팅 기반 사물인터넷 환경은 급격히 증가하는 통신량, 기종 간 이질성, 지연 시간과 같은 문제점으로 인해 어려움을 겪고 있다. 이를 해결하기 위한 대표적인 방법 중 하나는 분산 모델을 통해 클라우드 컴퓨팅 환경에 집중된 네트워크 또는 컴퓨팅 파워를 분산시키는 포그 컴퓨팅 (Fog Computing) 또는 에지 컴퓨팅 (Edge Computing)을 활용하는 것이다. 그러나 이 분산형 네트워크의 단점을 보완하기 위해 사물인터넷 (IoT, Internet of Things)과 가장 가까이 존재하는 네트워크 모델로써 미스트 컴퓨팅 (Mist Computing)이 탄생하였다. 그러나 다양한 프로토콜에 의해 통신이 이루어지는 사물인터넷 환경에는 수천 가지 제로데이 공격이 존재한다. 이 공격들의 대부분은 이전에 알려진 공격의 작은 변형체이다. 이러한 공격을 효과적으로 막기 위해 사물인터넷 환경에서의 침입 탐지 시스템은 지능적이어야 한다. 따라서 본 논문에서는, 미스트 컴퓨팅 환경에서 새로운 또는 지속적으로 변화하는 사물인터넷 대상 공격을 효과적으로 방어하기 위한 인공지능 기반 침입 탐지 시스템을 제안한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2021.11a
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• pp.34-36
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• 2021

미래 해상환경에 대응하기 위해 기존 항로표지의 기술 및 역할에 ICT 기술을 융합하여 스마트한 해양 서비스 제공을 위한 노력이 계속되고 있다. 본 논문에서는 현 항로표지 통신 시스템의 문제점을 분석하고 스마트 항로표지 시설 고도화를 위한 최적의 통신 시스템 및 다중 통신 플랫폼 개발 방향을 제시하도록 한다.

• 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 Korea Information Processing Society Conference
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• 2021.05a
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• pp.136-139
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• 2021

사물인터넷 기기들의 빠른 발전과 보급으로 인해 다양한 센서들부터 센싱 데이터가 수집되고 있다. 이에 따라, 많은 센싱 데이터 중 헬스케어 데이터를 기반으로 맞춤형 건강 서비스를 제공하는 사물인터넷 기반 헬스케어 분야가 발전하고 있다. 하지만, 사물인터넷 기기를 통해 수집되는 헬스케어 데이터는 민감한 데이터를 포함하기 때문에 헬스케어 데이터의 공유가 이뤄질 경우, 적절한 사용자만이 헬스케어 데이터를 사용할 수 있도록 해야 한다. 따라서, 본 논문은 사물인터넷 환경에서 속성기반암호화를 통해 적절한 사용자만이 데이터를 사용할 수 있도록 하고, 블록체인의 분산원장을 통해 데이터의 무결성과 책임추적성을 보장하는 민감한 센싱 데이터 공유 시스템을 제안하고자 한다.

• Journal of Internet of Things and Convergence
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• v.6 no.3
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• pp.15-20
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• 2020

In this paper, an error tracking platform is designed for enhanced-reliable IOT system. The platform is designed to enhance reliability of IOT system by analysing additional informations(OS, Browser, Device) and by notifying error detection to developers. Especially, in the case of an error in the service which it is difficult for developers to recognize it, The platform also supports notification services through various communication media(Email, Slack, SMS). The common interface is designed to accommodate many languages(typescript, Swift, and Android) in the development process, and the interface allows users to analyze errors that occur on various platforms, including mobile/web/desktop applications. By presenting each error in groups through issues, developers can easily identify issues in the service. The visualizing function is included to recognize various error type by dashboard.

• Journal of Convergence for Information Technology
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• v.7 no.3
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• pp.165-171
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• 2017

Recently, the development and dissemination of smart devices linked to the network are being actively performed, and IOT(Internet of things) is issued form of mutually cooperative relationship through interoperation within smart devices. In this paper, we propose an innovative intelligent coffee shop management system by sharing and cooperatively controlling smart devices and Internet devices. The system can order smartphones including kiosk orders and beacon-based user identification. And it is a system that can make custom order without grasping user location information using geofence. The paper provides weather, temperature, time and user-based recommendation services based on Big Data. Therefore, the system is increased cost reduction and work efficiency than general coffee shops.

• Journal of Advanced Marine Engineering and Technology
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• v.40 no.6
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• pp.542-547
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• 2016

In recent times, Internet of Things (IoT) has attracted wide attention, and there are increasing requests for IoT application services. Open-Source Hardware (OSH) utilizes a variety of components that are created through the sharing of hardware design so that others developers can also work on it. The concept of "open source" that attracted attention in the software industry has been applied to the hardware field by the emergence of IoT market. The emergence of OSH that has the advantage of low hardware cost and faster development encourages the idea of a diverse IoT application services. In this paper, we describe an IoT application service system that is developed using the OSH platform Arduino and Raspberry Pi to process collection, exchange, and computation of the environmental information. The overall system architecture and hardware and software components are presented.

• Journal of the Korea Convergence Society
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• v.10 no.1
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• pp.45-51
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• 2019

The use of the Internet of things plays a major role in the Fourth Industrial Revolution, and a series of tasks of accumulating, converging, analyzing and reusing various data and services becomes very important. Because the pace and scope if the paradigm shift in Fourth Industrial Revolution is so rapid and unpredictable, the development and utilization of a system to fulfill this role for IOT are urgently required. In this paper, we introduce the Web-based IOT management system, which connects the IOT with OKMindmap, which is a domestic open source software and service, and the Node-RED service. This system combines the advantages of OKMindmap with the advantages of Node-RED, which is capable of visual component based programming, so that it can easily and flexibly connect the IOT based on Web browsers, and various data and services can be integrated and linked. We developed a camera module, a temperature and humidity sensor module, and the motor control module in Raspberry PI basically, and tested the operation successfully. We plan to extend the IOT component gradually by using Arduino and System On Chip.