• 한국컴퓨터정보학회논문지
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• 제24권1호
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• pp.121-128
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• 2019

An Internet of Things(IoT) technology which provides intelligent services by combining context-awareness based intelligences, inter-communication is made of between things and things or between things and person through the network connected with intelligent things is spreading rapidly. Especially as this technology is converged into smart device, mobile, cloud, big data technologies, it is applied into various domains. Therefore, this is different from existing Web or Mobile Application. New types of IoT applications are emerging by adapting IoT into Web or mobile. Because IoT application is not only focused on software but also considering hardware or things aspect, there are limitations existing development process. Existing development processes don't consider analysis and design techniques considering both hardware and things. We propose not only a meta-model for development process which can support IoT application's development but also meta-models for main activities in this paper. Especially we define modeling elements by using UML's extension mechanisms, provide development process, and suggest design techniques how to apply those elements into IoT application's modeling phase. Because there are many types of IoT application's type, we propose an Android and Arduino-based on IoT application as a case study. We expect that proposed technique can be applied into many of various IoT application development and design with a form of flexible and extensible as well as main functionalities or elements are more concretely described. As a result, it brings IoT application's flexibility and the effect of quality improvement.

• 한국IT서비스학회지
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• 제14권1호
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• pp.159-173
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• 2015

This paper presents a study on the Internet of Things based low-power wireless sensor networks for remote monitoring of wildlife ecosystem due to climate change. Especially, it is targeting the wild vegetation communities ecological monitoring. First, we performed a pre-test and analysis for selecting the appropriate frequency for the sensor network to collect and deliver information reliably in harsh propagation environment of the forest area, and selected for sensors for monitoring wild vegetation communities on the basis of considerations for selecting the best sensor. In addition, we have presented the platform concept and hierarchical function structures for effectively monitoring, analyzing and predicting of ecosystem changes, to apply the Internet of Things in the ecological monitoring area. Based on this, this paper presents the system architecture and design of the Internet of Things based low-power wireless sensor networks for monitoring the ecosystem of the wild vegetation communities. Finally, we constructed and operated the test-bed applied to real wild trees, using the developed prototype based on the design.

• 한국컴퓨터정보학회논문지
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• 제22권9호
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• pp.91-97
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• 2017

IoT (Internet of Things) systems are based on heterogeneous hardware systems of different types of devices interconnected each other, ranging from miniaturized and low-power wireless sensor node to cloud servers. These IoT systems composed of heterogeneous hardware utilize data sets collected from a particular set of sensors or control designated actuators when needed using open APIs created through abstraction of devices' resources associated to service applications. However, previously existing IoT services have been usually developed based on vertical platforms, whose sharing and exchange of data is limited within each industry domain, for example, healthcare. Such problem is called 'data silo', and considered one of crucial issues to be solved for the success of establishing IoT ecosystems. Also, IoT services may need to dynamically organize their services according to the change of status of connected devices due to their mobility and dynamic network connectivity. We propose a way of dynamically composing IoT services under the concept of WoT (Web of Things) where heterogeneous devices across different industries are fully integrated into the Web. Our approach allows developers to create IoT services or mash them up in an efficient way using Web objects registered into multiple standardized horizontal IoT platforms where their resources are discoverable and accessible. A Web-based service composition tool is developed to evaluate the practical feasibility of our approach under real-world service development.

• 사물인터넷융복합논문지
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• 제6권1호
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• pp.17-22
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• 2020

본 논문은 사물인터넷 기반의 스마트 휴지통에 관한 연구이다. 현대 사회에서 쓰레기 처리는 여러 사회 문제를 일으킨다. 특히 유동인구가 많은 주말의 도심에서 쓰레기 처리 용량이 쓰레기 배출량을 따라가지 못해 문제가 발생하고 있다. 넘쳐나는 쓰레기로 악취가 발생하고, 미관을 해지고, 벌레가 생기는 등의 문제가 있다. 이러한 문제를 해결하기 위해 스마트 휴지통을 제안하였다. 제안된 스마트 휴지통은 쓰레기 압축 기능, 휴지통 자동 개폐 기능, 쓰레기양 표시기능, 휴지통 모니터링 및 제어 기능을 제공한다. 제안된 스마트 휴지통은 유동인구가 많은 옥외의 쓰레기 처리에 유용하게 활용될 수 있을 것으로 기대한다.

• 사물인터넷융복합논문지
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• 제6권1호
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• pp.73-81
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• 2020

클라우드 컴퓨팅을 사용하는 사물 인터넷 (IoT)은 원자력 발전소 사고가 안전성 평가를 위해 분석되는 원자력 산업에 적용된다. 후쿠시마 원자력 발전소 사고는 지진으로 인한 플랜트 고장 사고가 클라우드 컴퓨팅 기술 분석에 사용되는 사고 시뮬레이션을 위해 모델링되었습니다. 후쿠시마의 경우 자연 재해에 대한 빠르고 합리적인 치료가 필요했다. 실시간 안전 평가 (RTSA)와 몬테카를로 실시간 평가 (MCRTA)가 구성된다. 이 클라우드 컴퓨팅은 미래의 유사한 사고에 대비할 수있는 실용적인 방법을 제공 할 수 있습니다.

• 한국인공지능학회지
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• 제1권1호
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• pp.4-6
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• 2013

In the era of information society, IT industry has been developed very much. New technology has made appearance in citizens' lives. IOT (Internet of Things) has grown up the most rapidly in IT industry. Kevin Ashiton, MIT specialist, said, "Loading of FRIS and other sensors shall build Internet of things." Internet of things is said to let things have sensor and communication module and to exchange information and communicate each other. In this study, Internet of things has been applied to flowerpot to build automatic flowerpot control system that turns fan ON and supplies water depending upon temperature and moisture. Users are difficult to cognize temperature and humidity of flower pot correctly. In this study, an experiment obtained correct value of temperature and humidity to build control system. At the performance test of flower pot, commands turned ON depending upon temperature and humidity. Control system should be added to control water supply quantity and time objectively according to servo motor control. Purpose of further study was to control flower pot by remote system in connection with smart phone application. An application control can make not only temperature and humidity statistics but also server depending upon users' needs to turn fan ON and take actions and to control flower pot.

• 융합보안논문지
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• 제16권7호
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• pp.121-127
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• 2016

최근 스마트 기기의 보급화로 Wi-Fi, LTE 등을 이용한 무선인터넷 사용률이 대폭 증가한 반면 유선인터넷의 비율은 감소하고 있는 추세이다. 이렇듯 장소에 구애받지 않고 무선인터넷에 접속하여 사람과 사람뿐만이 아니라 사람과 사물간의 통신, 사물과 사물간의 통신인 사물인터넷의 범위가 점점 다양해지고 있는 추세이다. 사물인터넷(Internet Of Thing)의 빠른 확산과 함께 사물인터넷 보안 위협에 대한 우려도 크게 늘고 있다. 본 논문에서는 사물인터넷 환경에서 그룹 통신을 위한 키 분배와 관리에 대한 새로운 기법을 제안한다. 제안 기법은 키를 분배하지 않고 그룹에 속한 사물이 자신의 비밀 정보와 공개 값을 가지고 계산한 그룹 키를 사용하여 그룹 멤버 사이에 안전한 그룹 통신이 가능하게 된다.

• Journal of Computing Science and Engineering
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• 제12권1호
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• pp.12-23
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• 2018

The Internet of Things (IoT) ecosystem potentially includes heterogeneous devices with different processing mechanisms as well as very complicated network and communication models. Thus, analysis of data associated with adverse conditions is much more complicated. Moreover, mobile things in the IoT lead to dynamic alteration of environments and developments of a dynamic and ultra-large-scale (ULS) environment. Also, IoT and the services provided by that are mostly based on devices with limited resources or things that may not be capable of hosting conventional controls. Finally, the dynamic and heterogeneous and ULS environment of the IoT will lead to the emergence of new security requirements. The conventional preventive and diagnostic security controls cannot sufficiently protect it against increasing complication of threats. The counteractions provided by these methods are mostly dependent on insufficient static data that cannot sufficiently protect systems against sophisticated and dynamically evolved attacks. Accordingly, this paper investigates the current security approaches employed in the IoT architectures. Moreover, we define the dynamic security based on dynamic event analysis, dynamic engineering of new security requirements, context awareness and adaptability, clarify the need for employment of new security mechanism, and delineate further works that need to be conducted to achieve a secure IoT.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권7호
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• pp.2874-2891
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• 2016

Due to its potential, the Internet of Things (IoT) begins to be used in the industrial field. Nevertheless, although the concept called the Industrial Internet of Things does not know a widely accepted definition, it is based on the existing technology, and introduces the IoT in the industrial environment through the compliance with specific additional requirements and by integrating various fieldbuses with distinctive features, from the real-time point of view. The aim of this paper is to propose a practical architecture for the Industrial Internet of Things. The proposed architecture is designed around the Data Distribution Service for Real Time System (DDS) middleware protocol, and it is organized on four levels. Between these levels, it is defined standard interface, and they can be developed independently. For this reason, the architecture is scalable because at the middleware level, the DDS can be replaced by other middleware systems. At the final, it is performed a comparison between several middleware systems used in the proposed architecture.

• 한국융합학회논문지
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• 제7권2호
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• pp.1-6
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• 2016

그동안 인터넷은 인간이 정보를 주고 받는 유일한 공유의 장소로 인식되어 사용되어 왔다. 더불어 정보기술의 발달로 인해 다양한 디바이스들이 등장하였다. 이들 디바이스들은 인터넷을 통해 서로 연결되었으며, 사용자과 사용자는 물론 사용자와 물체, 물체와 물체간에 때와 장소에 구분되지 않으면서, 소통 가능한 사물 인터넷에 대한 관심이 고조되고 있다. 이런 사물인터넷은 여러 가지의 다른 정의 혹은 개념으로 연구가 진행되어 왔다. 본 연구에서는 사물인터넷을 이용한 스마트 산업현장의 사례들에 대해 살펴보고 앞으로의 발전 가능성에 대해 연구하였다. 사물인터넷 기반의 스마트 산업의 도메인은 우리 생활과 밀접한 관련성을 갖는 분야로 하였으며, 공간적 의미를 포함하는 스마트 시티, 생활의 주된 대상인 스마트 홈 및 건강과 관련된 스마트 헬스 영역으로 구분하여 기술하였다.