• International Journal of Internet, Broadcasting and Communication
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• 제12권2호
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• pp.77-82
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• 2020

IoT devices frequently require input resources to communicate with various sensors or IoT platforms. IoT device wastes a lot of time as idle time or waiting time to check the data of the input resource and use the input resource. In addition, IoT devices use various input resources. We compares and analyzes input idle time and input waiting time generated from hardware serial input resource, software serial input resource, digital port input resource, and analog port input resource using Arduino widely used as IoT device. In order to design the IoT device framework, it is necessary to understand the characteristics of input resources and to design them to minimize unnecessary input idle time and input waiting time. The analog input wait time has a much larger input wait time than the digital input wait time, so it must be designed to receive analog information periodically at the appropriate timing. The characteristics of the input resources analyzed in this way help to design an efficient IoT device.

• 한국정보과학회논문지:소프트웨어및응용
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• 제41권8호
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• pp.545-556
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• 2014

최근 각광받고 있는 연구분야 중 하나인 Internet of Things (IoT)은 사물들이 네트워크 상에 연결되어 있는 있는 컴퓨팅 환경으로, 이 환경을 구성하는 여러 IoT 디바이스들이 협업을 통해 사용자에게 유용한 기능을 제공할 수 있는 장점이 있다. IoT 디바이스의 제한된 배터리 수명, 이동성과 같은 동적인 특성으로 인해 IoT 디바이스의 상태는 계속해서 변하게 되며, 이로 인해 IoT 디바이스를 관리하는 데에 어려움이 있다. 본 논문에서는 IoT 디바이스의 동적인 특성에 의한 IoT 디바이스 관리 문제를 도출하고 이를 해결하기 위한 디바이스 관리 프레임워크를 제안한다. 그리고, 디바이스 검색, 디바이스 상태 확인, 디바이스 선택 및 연결, 그리고 디바이스 교체를 포함한 네 가지의 기법을 제시한다. 또한 제시된 기법들을 기반으로 디바이스 관리 프레임워크를 구현하고 실험을 통하여 제안한 기법들의 실효성을 검증한다.

• 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.

• 한국IT서비스학회지
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• 제15권4호
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• pp.41-62
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• 2016

In Internet of Things (IoT) era, more diverse types of information are collected and the environment of information usage, distribution, and processing is changing. Recently, there have been a growing number of cases involving breach and infringement of personal information in IoT services, for examples, including data breach incidents of Web cam service or drone and hacking cases of smart connected car or individual monitoring service. With the evolution of IoT, concerns on personal information protection has become a crucial issue and thus the risk analysis and management method of personal information should be systematically prepared. This study shows risk factors in IoT regarding possible breach of personal information and infringement of privacy. We propose "a risk analysis framework of protecting personal information in IoT environments" consisting of asset (personal information-type and sensitivity) subject to risk, threats of infringement (device, network, and server points), and social impact caused from the privacy incident. To verify this proposed framework, we conducted risk analysis of IoT services (smart communication device, connected car, smart healthcare, smart home, and smart infra) using this framework. Based on the analysis results, we identified the level of risk to personal information in IoT services and suggested measures to protect personal information and appropriately use it.

• Journal of Information Technology Applications and Management
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• 제29권1호
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• pp.1-28
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• 2022

To realize the vision of internet of things (IoT), where it is expected to bring significant impact to the global economy in the future, consideration of business models in the IoT context is necessary. This research attempts to build an enhanced artifact business model framework based on the definitions of IoT and literature on business models for analysis of IoT businesses. The framework is used to analyze four different types of players: the owner of things, vendors of devices, providers of connectivity and providers of IoT application services. The findings suggest that the owners of things tend to partner with ICT players to complement their weakness, and it tends to be connectivity providers. The device vendors leverage their strength of devices and device platforms to attract and enable 3rd party sensor/devices to interconnect, while the service providers are aiming to penetrate into customer premise. These lead to the following recommendations for non-IT players to consider in expanding into IoT business: 1) take into account differences in product development process between IT and non-IT businesses in expanding into IoT market; 2) collaborate with ICT players that acknowledge and understand the differences.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제23권9호
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• pp.550-556
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• 2017

사물 인터넷 기술의 발달로 인하여 언제 어디서든지 손쉽게 다양한 기기들의 상태를 조회하거나 제어 할 수 있는 환경으로 발전하고 있다. 그러나 현재의 IoT 관련 시스템을 이용하여 사물을 제어하려면 어플리케이션 실행, 공간 및 사물 선택, 사물 제어 등의 여러 단계에 걸친 복잡한 조작이 필요하기 때문에 손쉽고 빠르게 사물을 제어하거나 사물 제어에 대한 요청을 발송하는 부분에 여전히 많은 한계점을 가지고 있다. 본 논문에서는 보다 효율적인 사물 인터넷 제어를 위하여 IoT 태그 및 소셜 메시지 기반의 IoT 제어 프레임워크를 제안한다. 제안하는 시스템에서는 IoT 태깅을 수행한 사용자의 사물 소유권에 따라 사물을 직접 제어하거나 사물 소유주에게 IoT 메시지 전송을 통하여 간편하게 사물을 제어 할 수 있다. 본 논문에서는 프로토타입 구현을 통하여 IoT 환경에서 보다 직관적이고 효율적인 사물 제어가 가능함을 보였다.

• International Journal of Internet, Broadcasting and Communication
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• 제11권1호
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• pp.27-38
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• 2019

Sensors collect information for Internet of Things (IoT)-based services. However, indoor construction sites have a poor communication environment and many interfering elements that make it difficult to collect sensor information. In this study, a network was constructed between a Bluetooth Low Energy (BLE)-based IoT device based on a serverless IoT framework and a router. This experimental environment was applied to large- and small-scale indoor construction sites. Experiments were performed to test the communication performance of BLE-based IoT devices and routers at indoor construction sites. An analysis of the received signal strength indication (RSSI) graph patterns collected from the communication between the BLE-based IoT devices and routers for different testbed site situation revealed areas with good communication performance and poor communication performance due to interfering factors. The results confirmed that structural components of the building as well as the materials, equipment, and temporary facilities used in indoor construction interfere with the communication performance. Construction project managers will require improved technical knowledge of IoT, such as optimizing the router placement and matching communication between the router and workers, to improve the communication performance for large-scale indoor construction.

• Journal of Information Processing Systems
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• 제15권2호
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• pp.449-456
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• 2019

SMART home is one of the most popular applications of Internet-of-Things (IoT) technologies, which is expanding in terms of range of applications. SMART home technology provides convenience at home by connecting household appliances to a single network, control, and management. However, many general home appliances do not support the network functions yet; hence, enjoying such convenient technology could be difficult, and it could be expensive in the beginning to build the framework. In addition, even though products with SMART home technologies are purchased, the control systems could differ from device to device. Thus, in this paper, we propose a SMART home framework, called an S-mote that can operate all the IoT functions in a single application by adding an infrared or radio frequency module to general home appliances. The proposed framework is analyzed using four types of performance tests by five evaluators. The results of the experiment show that the SMART home environment was implemented successfully and that it functions appropriately, without any operational issues, with various home appliances, including the latest IoT devices, and even those equipped with an infrared or radio frequency module.

• 디지털산업정보학회논문지
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• 제15권3호
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• pp.29-36
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• 2019

With the rapid development of 5G technology, more and more network functions are interconnected and more popular. In order to effectively manage emerging network concepts, it allows any device object in the real world to be connected anywhere and at any time through the integration of device object recognition, interaction and raw data collection technologies. In addition, IP Multimedia Subsystem (IMS) is an architecture framework for transmitting IP-based information to the device object which can be represented as end user. Therefore, the Internet of Things and IP Multimedia Subsystem (IoT-IMS) communication platform can provide a convenient and fast way for user or device objects to deploy new application services effectively. In particular, in order to collect and manage the device information from IoT effectively in the IoT-IMS communication platform, an IoT Information Gateway (IIG) is proposed. Through the IoT Application Service (AS) scenario, the collected device information can be easily observed and managed in a unified way.

• 스마트미디어저널
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• 제8권1호
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• pp.35-42
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• 2019

IoT 디바이스 기술의 발전으로 디바이스가 주변 환경을 인식하고 동작하게 되면서, 막대한 양의 IoT 디바이스 데이터를 효율적으로 처리하기 위한 방안이 요구되고 있다. 기존에 사용되던 클라우드 컴퓨팅은 부하와 거리에 따른 전송 지연 문제가 발생한다. 이러한 문제를 해결하기 위해 포그 컴퓨팅이 등장하였다. 포그 컴퓨팅은 IoT 디바이스를 제어하기 위한 환경으로, 클라우드의 단점을 해결하기 위해 IoT 디바이스를 가까이 두어 근거리 통신을 수행한다. 그러나 IoT를 위한 포그 컴퓨팅 관련 연구들은 포그컴퓨팅의 구조와 프레임워크에 대한 연구가 주를 이룬다. 따라서 본 논문에서는 포그컴퓨팅을 수행하기 위한 플랫폼을 제안한다. 제안하는 플랫폼은 포그 컴퓨팅 환경에서 IoT 디바이스를 모니터링 및 분석, 제어할 수 있는 통합 플랫폼이다.