• KIISE Transactions on Computing Practices
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• v.21 no.12
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• pp.756-761
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• 2015

With the emergence of the Internet-of-Things (IoT) paradigm, there is a growing demand for personalized services using IoT contexts acquired from heterogeneous IoT devices. However, due to the mismatch between IoT context exchange schemes of context-aware services and IoT devices, IoT applications can acquire IoT contexts only from IoT devices that support the same IoT context exchange schemes. In this paper, we propose dynamic methods to mediate those mismatches on the IoT context exchange schemes. With the proposed mediation methods, context-aware services can collect IoT contexts from heterogeneous IoT devices without considering their IoT context exchange schemes.

• Journal of KIISE
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• v.43 no.8
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• pp.893-901
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• 2016

In Internet of Things (IoT) environments, users are required to search for IoT devices necessary to access services for accomplishing their tasks. As IoT technologies advance, a user task will utilize various types of IoT-based services that are deployed in an IoT environment. Therefore, to accomplish a user task effectively, the services that utilize IoT devices need to be found in a certain geographical region. In addition, the service discovery needs to be accomplished in a stable manner while considering dynamically changing IoT environments. To deal with these issues, we propose two service discovery methods that consider geographic cohesiveness of services in IoT environments. We compare the effectiveness of the proposed methods against a traditional service discovery algorithm that does not consider geographic cohesiveness.

• Journal of KIISE
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• v.42 no.12
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• pp.1575-1583
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• 2015

With the emergence of Internet-of-Things (IoT) computing, it has become possible to acquire users' health-related contexts from various IoT devices and to diagnose their biological aging through analysis of the IoT health contexts. However, previous work on methods of aging diagnosis used a fixed list of aging diagnosis factors, making it difficult to handle the variability of users' IoT health contexts and to dynamically adapt the addition and deletion of aging diagnosis factors. This paper proposes a design and methods for a dynamically adaptable aging diagnosis framework that acquires a set of IoT health contexts from various IoT devices based on a set of aging diagnosis factors of the user. By using the proposed aging diagnosis framework, aging diagnosis methods can be applied without considering the variability of IoT health contexts and aging diagnosis factors can be dynamically added and deleted.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.200-201
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• 2016

Recently, according to era of Internet of Things was opened, various mobile devices connected to the internet using wireless communication. Many IoT devices have limited communication performance. Thus, these devices efficiently forward data using an abbreviated ID method. However, movement of devices causes abbreviated ID confliction, and These conflict degraded network performance. Therefore it is important management of ID conflict. In this paper, we proposed an abbreviated ID conflict management method to improve the efficiency of communication in the dynamic IoT network.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.2
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• pp.97-101
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• 2021

With the development of the Internet of Things technology, new devices are being developed and used to provide various applications and services. Most IoT devices have a high probability of error because they operate in harsh environments with limited resources. In addition, it is necessary to manage the Internet of Things devices dynamically because new devices are constantly deployed. In this paper, we design a system that allows users to monitor the mounting of new devices to perform the necessary tasks and implement prototypes to validate their operability. Our system also provides a web-based programming interface to direct work on new modules and share work content with each other.

• Journal of Internet of Things and Convergence
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• v.6 no.1
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• pp.1-8
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• 2020

Following the advanced fuel cycle initiative (AFCI) promotions in the United States, the analytic proposition for global fuel cycle initiative (GFCI) has been investigated using dynamical simulations. The political and economic aspects are considered simultaneously due to the particular characteristics of the nuclear materials. The spent nuclear fuels (SNFs) are treated as the reprocessing by the nuclear non-proliferation treaty (NPT) exemption nations and the NPT excluded nations. Otherwise, the pyroprocessing and repository can be done without NPT restriction. In addition, the international trade is considered as the economic aspect where the energy production is a key issue of the GFCI. The dynamical simulations have been done until 2050. The result of the International Trade shows the gradually increasing shape. Additionally, the Nuclear Power Plant Operation shows the increasing by stepwise shape.

• Journal of Internet of Things and Convergence
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• v.10 no.2
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• pp.85-91
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• 2024

In this paper, we studied projection mapping, which is being utilized as a digital canvas beyond space and time for theme parks, mega events, and exhibition performances. Since the existing projection technology used for fixed objects has the limitation that it is difficult to map moving objects in terms of utilization, it is urgent to develop a technology that can track and map moving objects and a real-time dynamic projection mapping system based on dynamically moving objects so that it can respond to various markets such as performances, exhibitions, and theme parks. In this paper, we propose a system that can track real-time objects in real time and eliminate the delay phenomenon by developing hardware and performing high-speed image processing. Specifically, we develop a real-time object image analysis and projection focusing control unit, an integrated operating system for a real-time object tracking system, and an image processing library for projection mapping. This research is expected to have a wide range of applications in the technology-intensive industry that utilizes real-time vision machine-based detection technology, as well as in the industry where cutting-edge science and technology are converged and produced.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.206-207
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• 2012

기술개발에 있어서 사용자에게 정확한 정보전달과 함께 원활한 서비스를 제공하기 위한 방법은 언제나 중요한 이슈로 자리매김하고 있다. 오늘날에는 인간이 가지고 있는 능력을 디지털 정보를 통해서 증강시키고자 하는 많은 기술들(Intelligent M2M, 증강현실)이 연구되고 있다. 그러나 기존의 기술들은 인간의 능력을 제한적으로 증강시켜주고, 각 기술마다 한계점을 가진다. 이러한 문제점을 보완하기 위해 본 연구는 사용자가 처한 상황에 적합한 서비스를 제공하는 증강 사물 컴퓨팅을 제안한다. 증강 사물 컴퓨팅은 특정 목적을 수행하기 위해서 사용자 주변의 각 장치들이 가진 요소를 동적으로 재구성하여 상황에 적합한 서비스를 사용자에게 제공한다. 이에 본 연구에서는 증강 사물 컴퓨팅을 위한 개념과 필수요소를 정의하고, 이를 기반으로 한 시나리오를 적용하여 설명한다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.30-33
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• 2006

RFID(Radio Frequency Identification)은 RF주파수를 이용해서 사물이나 사람의 정보를 인식하는 자동인식 기술이다. 이 기술은 무선 주파수를 사용해서 대량의 사물을 동시에 인식 할 수 있다는 장점이 있지만, 무선 주파수를 사용하기 때문에, 프라이버시 문제와 주파수 충돌문제와 같은 부수적인 단점을 가지고 있다. 리더 충돌문제를 해결하기 위한 여러 가지 많은 연구들이 진행 되고 있지만, 현재까지 연구된 대부분은 고정적인 환경에서의 해결 방법들이다. 본 논문에서는 앞으로 다가올 모바일 사회에 대비해서, 밀집된 모바일 환경에서의 리더 충돌 방지 기법을 제안한다. 이 기법은 모바일 리더의 위치를 계산하고, 적절한 주파수를 할당하고 동적으로 RF의 세기를 조절함으로써 리더의 충돌을 방지 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.01a
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• pp.103-104
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• 2016

사물 인터넷에서는 대부분의 기기가 와이맥스와 같은 무선 통신을 사용하는데 음영지역이 발생할 경우 펨토셀이 필요하다. 펨토셀은 안전적인 통신을 제공하지만 외부에서 무선 송신을 통해 접근할 수 있어 중간자 공격이 발생하기 쉽다. 강제 지연 인터락 프로토콜은 중간자 공격을 탐지하지만 고정된 지연 시간을 통해 패킷 전송 시간은 일정하다. 본 논문은 평가 함수를 사용하여 동적 지연 시간 결정을 통해 패킷 전달 시간에 대해 감소하는 방법을 제안한다. 이로 인해 제안 기법에서는 지연 시간이 효율적으로 감소하여 전송 속도를 향상한다.