• The Journal of Korean Institute of Next Generation Computing
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• v.13 no.4
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• pp.90-99
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• 2017

The service structure of the Mobius IoT platform, which has been developed on the basis of the oneM2M standard, connects servers and gateways directly to exchange data using HTTP or MQTT. Such structure may cause problems not to operate IoT services safely. In this paper, we propose an effective structure to manage sessions between gateways (or devices) and server using SIP safely and stably. In addition, we provide the way to implement the proposed method on Mobius IoT platform. To verify the operation of the proposed method, we actually implement the proposed method on Mobius IoT platform, and construct a testbed for a typical IoT application service environment with SIP servers. The results of the experiment show that the proposed method works normally, and it can contribute to the stable operation of IoT services.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.5
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• pp.151-156
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• 2016

The IoT technology and sensors used for collecting the environment information has rapidly increased the number and type. With the increasing need for this type of sensor effective system for selecting and testing the sensor nodes for the IoT to develop products and services. In this study, we design and implement IoT sensor testing system for IoT service and product. In order to support rapid prototyping, the proposed system provides testing and management tools for IoT sensor nodes. We analyze the requirements of the proposed system and design the system based on the functional component-specific design. Finally, we implement testing application to verify the functional elements of the proposed system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.664-671
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• 2020

A Smart Building, one that uses automated processes to control its operations, refers in this study to one that uses both Internet of Things (IoT) devices and cloud services software. Cloud service providers (e.g. Amazon, Google, and Microsoft) have recently providedIoT cloud platform application services on IoT devices. According to Postscapes, there are now 152 IoT cloud platforms. Choosing one for a smart building is challenging. We selected Microsoft Azure IoT Hub and Amazon's AWS (Amazon Web Services) IoT. The two platforms were evaluated and selected from a smart building perspective. Each prototype was evaluated on two different IoTplatforms, assuming a typical smart building scenario. The selection was based on information and experience gained from developing the prototype system using the IoT cloud platform. The assessment made in this evaluation may be used to select an IoTcloud platform for smart buildings in the future.

• Journal of Software Assessment and Valuation
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• v.15 no.1
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• pp.123-131
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• 2019

The Internet of Things (IoT) environment must be able to meet the needs of users by providing access to various services that can be used to develop diverse user applications. However, QoS issues arise due to the characteristics of the IoT environment, such as numerous heterogeneous devices and potential resource constraints. In this paper, we propose a QoS prediction method that reflects trust between users in SOA based IoT. In order to increase the accuracy of QoS prediction, we analyze the trust and distrust relations between users and identify similarities among users and predict QoS based on them. The centrality is calculated to enhance trust relationships. Experimental results show that QoS prediction can be improved.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.05a
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• pp.602-603
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• 2018

최근 사물인터넷 환경에서는 다양한 서비스가 공존하고 있다. 특히 동일 지역 내에 다양한 서비스가 제공되고 있으며 서비스 별로 사물인터넷 디바이스가 구성되어 있다. 이런 네트워크 환경은 서비스 제공에 있어 비효율적이다. 따라서 본 논문에서는 서비스 중심의 사물인터넷 네트워크 구축을 위한 네트워킹 기법을 제안한다. 제안하는 기법은 사물인터넷 환경에서 Self-Organization IoT Network (S-IoTN) 기법을 활용한 서비스 중심 사물인터넷 네트워킹 기법이다. 제안하는 기법은 사물인터넷 서비스 제공에 필요한 제어메시지를 최소활 할 수 있는 기법으로 활용 가능하다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.11
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• pp.2656-2664
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• 2015

IoT management hub has to request the WLAN AP list of the accessible areas in a place that is installed, or choose a specific WLAN AP you want to connect in order to be connected to the Internet. the specific method also is required to input the password when the security key was set. As that way, IoT management hub needs both the display device and the input device to see the list of WLAN AP and to input the security key. If the IoT management hub is consist of them, It is difficult to achieve the objective of the miniaturization and cost reduction. In this paper, we propose a method to connect to a WLAN AP network using a smart-phone without the display device and the input device.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.413-415
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• 2019

In this paper, we develop IoT-HiAS(IoT-Human Interactive Advertising Service) for sharing economy. The HiAS device shooting the front of the device via a webcam and recognizes the person in real time through the SSD model using MobileNet. If the number of persons above the set threshold is recognized by counting the recognized person, the advertisement is reproduced on the idle resource through the beam projector. At the same time as the advertisement is reproduced, the captured image of the advertisement start time in the front of the device and the number of recognized persons are sends the IoT server of an oneM2M-compliant HiAS server using the IoT client. When the advertisement is finish, the webcam is shooting the front of the device and the image is sends the IoT server. We implemented the IoT-based human interactive advertising service by transmitting the received data to the advertiser and the advertising producers through the SNS(Social Network Service) agent of the HiAS server.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.1315-1317
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• 2017

다양한 IoT(사물인터넷) 서비스가 등장하고 수요가 많아짐에 따라 이를 통합적으로 관리하고 제어하는 통합 서비스 플랫폼에 관한 여구가 활발하게 진행되고 있다. 하지만 서비스의 표준 부재로 인하여 IoT 서비스 모듈의 재활용 및 이식은 불가능한 상황이다. 이러한 문제를 해결하기 위하여 본 연구에서는 IoT 서비스의 각 동작 단계에 EM 알고리즘을 적용하여 [1]의 동작기반 분류 기법을 확장한다. 제안한 EM 기반 IoT 서비스 분류 알고리즘은 서비스 유사도를 기반하여 분류 함으로 모듈의 재활용성을 높이고 서비스 간의 협업에 있어서 효율성 증대를 기대할 수 있다. 성능 평가를 통하여 평균에 대한 표준편차로 클러스터링되는 것을 확인 할 수 있다.

• Journal of Information Technology Services
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• v.18 no.4
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• pp.97-113
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• 2019

With the development of sensor, communication and intelligent software technology, expectation of IoT-based service which can receive desired service automatically and anytime, anywhere is getting higher. In addition, IoT-based services have begun to anticipate the development of a hyper-connected society. Despite these expectations and anticipations, few studies have empirically identified ways to improve the intentions of prospective customers to use IoT-based services. Therefore, the purpose of this paper is to propose a theoretical model that can explain the factors that determine the intention of using IoT-based services. In addition, this study investigates what factors affect the intention to use IoT-based services focusing on the connectedness. Especially, perceived connectivity with the (virtual) community, unlike the connectivity with the machines, is newly proposed, to understand the IoT technology adoption behavior. The empirical results suggest that social relationship is one of the critical factors to affect the use of services running on interconnected technology such as IoT. When IoT-based service is recognized as a link to other communities, it has been found to have a positive effect on intention to use via perceived belongingness.

• Information and Communications Magazine
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• v.31 no.12
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• pp.25-30
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• 2014

최근 전 세계적으로 주목을 받고 있는 사물인터넷(IoT) 기술의 발전과 함께, 사물인터넷 기반의 헬스케어, 스마트 시티, 농업, 국방 등의 다양한 서비스 개발이 본격적으로 진행되고 있다. 특히, IoT 기반 헬스케어 서비스는 IoT 융합 관련 핵심 서비스로서 성장하고 치열한 글로벌 경쟁 속에서 미래 정보통신산업 의 판도를 좌우할 것으로 예상된다. 본 고에서는 최근 국내외에서 활발히 진행되고 있는 IoT 기반 헬스케어 서비스 및 플랫폼 관련 동향을 살펴보고 향후 산업화 전망에 대하여 알아본다.