• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권8호
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• pp.3958-3971
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• 2016

With Internet of Things (IoT) technology, home environment becomes smarter than ever. Not only smart devices such as smart phone or smart TV, but also various IoT devices including sensor, smart thermostat, and smart scale has now become very common on the market. These devices have connectivity to the Internet, so that user can read data from the device or control the device using Internet technology. However, due to diversity of smart home requirements, device collaboration in smart home remains a challenging task still. Usually smart home is built with various technologies to fulfill its own purpose, and these purposes cover very wide area from controlling low-power sensor devices to controlling high-performance devices like smart TV and smart phone. This variety of smart home requirements makes smart home very complicated due to mixed network architecture, protocol and technology. In this paper, a framework to enable managing and collaborating heterogeneous IoT devices in smart home environment is proposed. Several programming models are defined in the proposed framework to make application development for heterogeneous devices more intuitive. The proposed framework has been implemented as a web service, and a case study with real-world smart home IoT devices is presented.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권11호
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• pp.4203-4223
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• 2021

Accelerated by the Internet of Things (IoT), the need for further technical innovations and developments within wireless communications beyond the fifth generation (B5G) networks is up-and-coming in the past few years. High altitude platform station (HAPS) communication is expected to achieve such high levels that, with high data transfer rates and low latency, millions of devices and applications can work seamlessly. The HAPS has emerged as an indispensable component of next-generations of wireless networks, which will therefore play an important role in promoting massive IoT interconnectivity with 6G. The performance of communication and key technology mainly depend on the characteristic of channel, thus we propose an efficient Markov chain based channel model, then analyze the HAPS communication system's uplink capability and swing effect through experiments. According to the simulation results, the efficacy of the proposed scheme is proven to meet the requirements of ubiquitous connectivity in future IoT enabled by 6G.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.135-138
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• 1998

In this paper, we propose an software architecture for home network gateway set-top-box that supports the connectivity between various consumer devices and the Internet simultaneously. To improve the scalability of the software, the proposed architecture uses the abstracted protocol driving structure, and to enhance the user-friendliness, the unified device access and management user interface is implemented using web technology. A prototype for the proposed architecture is implemented for evaluating the usability under the home network test bed.

• 기술사
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• 제33권4호
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• pp.48-53
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• 2000

To be survived and prosperous in this rigorous competition era for the nation with insufficient natural resources like us, we must create idea for additive products no matter small or large scale utilizing our knowledge. This is to show a small example of value creation in connection with ADSL(Asymmetric Digital Subscriber Line) POTS Splitter from developing to successful commercializing, which the ADSL system is booming up these days for high speed Internet connectivity.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (A)
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• pp.652-654
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• 2004

Ad Hoc On-Demand Routing Protocol(AODV)이 ad hoc 네트워크에 알맞게 잘 설계되었지만, 인터넷과의 통신에는 그렇지 못하다. 인터넷과 ad hoc 네트워크의 통합에 몇 가지 해결책이 제안되었다. 그러나 그 제안들은 몇 가지 결점을 가지고 있다. 그에 따라 우리는 중복 제어 패킷을 처리하는 동안의 제어패킷 오버헤드와 전원 소모를 줄인 동적 에이전트 광고를 제안하였으며 패킷 전송에 대한 오버헤드를 기존의 해결책과 비교하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권12호
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• pp.4739-4758
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• 2015

The IPv4 addressing scheme, which was proposed by IETF in 1981, provides 4.3 billion unique 32-bit IP addresses but has been fully exhausted in Feb, 2011. This exhaustion of unique IP addresses poses significant challenges to the addition of new devices to the Internet as well as offering new services. Internet of Things, which provides interconnected uniquely identifiable devices in the existing Internet infrastructure, will be greatly affected by the lack of unique IP addresses. In order to connect to the existing Internet infrastructure, every new device needs a uniquely identified IP address for communication. It has been estimated that by the year 2020 more than 30 billion devices would be connected to the Internet. In order to meet the challenge of such vast requirement of unique IP addresses, the devices in IoT will have to adopt IPv6, which is the latest version of Internet Protocol. IPv6 uses 128-bit IP addresses and offers 2¹²⁸ unique IP addresses. Therefore, it expands IPv4 and provides new features of end to end connections as well as new services. In this paper, the various challenges with respect to providing connectivity, security, mobility, etc., have been discussed and how IPv6 helps in meeting those challenges.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권2호
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• pp.1070-1088
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• 2017

Recently, the applications of Internet of Things (IoTs) are growing rapidly. Wireless Sensor Network (WSN) becomes an emerging technology to provide the low power wireless connectivity for IoTs. The IPv6 over low-power wireless personal area networks (6LoWPAN) has been proposed by IETF, which gives each WSN device an IPv6 address to connect with the Internet. The transmission congestion in IoTs could be a problem when a large numbers of sensors are deployed in the field. Therefore, it is important to consider whether the WSN devices have be completely integrated into the Internet with proper quality of service (QoS) requirements. The Software Defined Network (SDN) is a new architecture of network decoupling the data and control planes, and using the logical centralized control to manage the forwarding issues in large-scale networks. In this research, the SDN-based 6LoWPAN Border Router (6LBR) is proposed to integrate the transmission from WSNs to Internet. The proposed SDN-based 6LBR communicating between WSNs and the Internet will bring forward the requirements of end-to-end QoS with bandwidth guarantee. Based on our experimental results, we have observed that the selected 6LoWPAN traffic flows achieve lower packet loss rate in the Internet. Therefore, the 6LoWPAN traffic flows classified by SDN-based 6LBR can be reserved for the required bandwidth in the Internet to meet the QoS requirements.

• 한국콘텐츠학회논문지
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• 제15권8호
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• pp.519-531
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• 2015

정보 기술은 관광 산업에 있어 중요한 역할로서 적지 않은 영향을 끼치기 때문에 관광 산업은 항상 정보기술과의 융합을 실천해왔다. 이는 인터넷의 등장으로 인해 정보원의 규모가 확장되면서 가속화되었다. 특히, 스마트폰과 소셜 네트워크 서비스(SNS: Social Network Service)의 등장은 이러한 흐름의 주요한 사례로 볼 수 있다. 한국관광공사는 이러한 상황에 발맞춰 인터넷, 스마트폰 그리고 SNS를 토대로 스마트관광 시스템을 구축하고 있다. 본 연구에서는 이러한 한국관광공사의 스마트 관광 시스템의 각 플랫폼들을 분석하고 이들 사이의 연관성을 설명하는데 그 목적을 두고 있다.

• 한국산학기술학회논문지
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• 제14권12호
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• pp.6469-6477
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• 2013

인터넷의 규모가 확대됨에 따라, 인터넷의 에너지 소모와 GHG(Green House Gas) 배출에 대한 문제는 최근의 새로운 이슈로 등장하였다. 그러나 이러한 문제를 다루는 인터넷 그리닝(Greening)에 대한 관심은 주로 엣지(Edge) 장비에 집중되어 있으며, 과도한 네트워크 연결성으로 인한 유선 네트워크 장비의 에너지 낭비량과 절약 잠재성에 대해서는 깊이 있는 연구가 부족한 실정이다. 본 연구에서는 유선 네트워크에서 에너지 효율성에 대한 관심의 배경과 연구의 타당성을 환경적, 경제적, 에너지 사용의 측면에서 상세히 제시한다. 그리고 네크워크 장비에서의 에너지 소모량과 절약 잠재성을 추정하고 도출한 데이터를 바탕으로 유선 네트워크 장비의 에너지 소모의 주된 요인을 분석하여, 향후 미래 인터넷 기술의 발전 방향을 제시한다.

• 한국전자통신학회논문지
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• 제10권6호
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• pp.721-728
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• 2015

사람 중심이었던 인터넷이 사물 인터넷으로 진화함에 따라 우리들의 삶이 보다 스마트하게 발전하고 있다. 사물 인터넷(IoT)은 물리적 객체나 전자 제품, 소프트웨어, 센서 및 제조업체, 운영자 또는 연결된 다른 장치와 데이터를 교환하여 더 큰 가치와 서비스를 달성 할 수 있도록 연결된 사물 네트워크를 말한다. 지금까지 계량 정보 분석과 미래 유망영역 탐지에 대한 연구는 키워드를 중심으로 수행해왔다. 본 논문에서는 문헌에서 키워드 매핑에 대한 동태적 분석을 통하여 최근에 관심 영역인 사물 인터넷과 스마트 디바이스에 대한 미래 유망 영역을 탐지하는 방법을 제시한다.