• Journal of information and communication convergence engineering
• /
• v.15 no.1
• /
• pp.37-42
• /
• 2017

The constrained application protocol (CoAP) can be used for remotely controlling various sensor devices in Internet of Things (IoT) networks. In CoAP, to support the handover of a mobile sensor device, service discovery and message transmission needs to be repeated, although doing so would increase the handover delay significantly. To address this limitation of CoAP, a centralized CoAP scheme has been proposed. However, it tends to result in performance degradation for an inter-domain handover case. In this letter, we propose a distributed CoAP handover scheme to support the inter-domain handover. In the proposed scheme, a distributed mobility agent (DMA) is used for managing the location of mobile sensors in a domain and performing handover control operations with its neighboring DMAs in a distributed manner. A performance comparison reveals that the proposed scheme offers a performance improvement of up to 29.5% in terms of the handover delay.

• ETRI Journal
• /
• v.39 no.2
• /
• pp.202-212
• /
• 2017

With the advent of the Internet-of-Things paradigm, the amount of data production has grown exponentially and the user demand for responsive consumption of data has increased significantly. Herein, we present DART, a fast and lightweight stream processing framework for the IoT environment. Because the DART framework targets a geospatially distributed environment of heterogeneous devices, the framework provides (1) an end-user tool for device registration and application authoring, (2) automatic worker node monitoring and task allocations, and (3) runtime management of user applications with fault tolerance. To maximize performance, the DART framework adopts an actor model in which applications are segmented into microtasks and assigned to an actor following a single responsibility. To prove the feasibility of the proposed framework, we implemented the DART system. We also conducted experiments to show that the system can significantly reduce computing burdens and alleviate network load by utilizing the idle resources of intermediate edge devices.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2015.01a
• /
• pp.37-38
• /
• 2015

본 논문에서는 IoT(Internet of Things) 환경 기반의 문화재 학습 시스템 기술을 제안한다. 각 상황에 해당하는 시스템 모듈을 기반으로 하여 문화재에 대한 정보의 수집 및 분석을 통해 사용자에게 적합한 서비스 제공하여 문화재에 대한 관심을 증대시키고 문화재 정보에 대한 효율적인 이해관계를 제공한다. 또한 제안하는 시스템으로 국민의 문화재에 대한 이해를 높이고 정보 기술의 발전을 활용한 지식 정보 기반의 문화재 서비스를 제공 할 수 있다.

• Smart Media Journal
• /
• v.5 no.3
• /
• pp.9-16
• /
• 2016

Many countless services form using the Internet technology of things, in order to provide a variety of services in the current also many institutions, have created a new technology and protocols. In this paper, we design the resource service model for the efficient service provided by the system for controlling access to the Internet services of the things, to implement. The resources of the service that the user tries to access modeled using LCRS (Left Child-Right Sibling) tree, by utilizing the service token resource, it is possible to perform access control to services.

• Journal of Internet of Things and Convergence
• /
• v.7 no.2
• /
• pp.55-63
• /
• 2021

The purpose of this study was to investigate the structural relationship between the use motives of the Internet of Things (IoT), which was presented as a technology strategy priority for university students, on usage attitudes, usability performance and life satisfaction. From April 1 to April 30, 2021, a non-face-to-face survey was conducted targeting university students living in Gwangju Metropolitan City and Jeollanam-do, and the study was conducted in a total of 213 copies. The collected questionnaires were analyzed using IBM's SPSS 21.0 and AMOS 21.0 programs. The research results are as follows. First, the motivation for using IoT was found to have an effect on usage attitude, and it was found to have an effect on life satisfaction and also on usage performance. Second, it was found that the attitude of using the Internet of Things had an effect on the usability performance. However, it was found that there was no effect on life satisfaction. Third, it was found that the use of IoT has an effect on the life satisfaction of college students. Fourth, it was found that the indirect effect on the attitude of use had an indirect effect on the relationship between the motivation for use and the performance of use. However, it was found that there was no indirect effect on the relationship between use motivation and life satisfaction. Fifth, the indirect effect on the usability performance was found to have an indirect effect on the relationship between use motivation and life satisfaction, Also, it was found that there was an indirect effect on the relationship between usage attitude and life satisfaction. Sixth, in the relationship between use motivation and life satisfaction, there was no double indirect effect via use attitude and utilization performance. Based on these results, the motivation for using the Internet of Things for college students and a solution to the information gap were proposed.

• Journal of the Korea Society of Computer and Information
• /
• v.23 no.9
• /
• pp.113-122
• /
• 2018

In this paper, IoT(Internet of things) technology, which is the core of the 4th industrial revolution, was applied to the study of reduction of consumption current. The IoT is a sensor that collects data, a sensor communication, a gateway that processes and stores the collected data. Data application of IoT technology is applied to smart home, smart city, healthcare, smart factory, etc. and it needs to be applied to various industrial fields. By sensing the location of the sensor device, the specific functions of the gateway and the platform are turned ON and OFF to reduce the consumption current of the equipment during the OFF period. When the sensor device accesses the gateway, the specific function of the gateway is turned ON and When the device is separated from the gateway, it senses the sensitivity of the wireless signal and automatically turns off the certain functions. As a resurt, it has reduced the consumption of current. In this paper, we propose a novel system for detecting the location of sensor devices by applying IoT technology. The system implementation is realized by software based, and defines the requirements for the implementation of the sensor device gateway. The gateway automatically detects the location, movement of the device and performs necessary functions. Finally verifies the automatic detection performance of the gateway according to the location of the device. It will contribute greatly to the development of the smart city and office.

• ETRI Journal
• /
• v.44 no.4
• /
• pp.543-559
• /
• 2022

To determine a suitable waveform for Internet of Things (IoT) transmission over low-Earth orbit (LEO) satellites, this paper reports the results of a performance comparison between chirp spread spectrum (CSS)-based LoRa and direct sequence spread spectrum (DSSS)-based Ingenu. The performance of both waveforms was measured in terms of the packet error rate, throughput, and packet loss rate, considering the Doppler effect caused by the high speed of LEO satellites and the interference among multiple terminals. Simulation results indicate that the DSSS scheme is more suitable than the CSS scheme for high-traffic IoT services because of its robustness against interference among multiple terminals. However, the CSS scheme is more suitable than the DSSS scheme for high-mobility IoT services because of its robustness against the Doppler effect. We discuss various solutions, such as the preprocessing of Doppler effect and avoidance of packet collision, to enhance the performance of the DSSS and CSS schemes. The simulation results of the proposed solution show that the enhanced DSSS scheme can be a proper waveform in IoT transmission over LEO satellites for both the high-traffic and high-mobility services.

• Journal of Information Technology Services
• /
• v.14 no.1
• /
• pp.217-236
• /
• 2015

The purpose of this study is to propose the effective location-based IoT service acceptance model by integrating ELM (Elaboration Likelihood Model) with UTAUT (Unified Theory of Acceptance and Use of Technology). The Partial Least Squares was used to analyze the causal relationships with respect to the effects of central route and peripheral route on acceptance intention. The results shows that central route has more significant impacts on perceived usefulness than peripheral route and CFIP (Concern for Information Privacy) weaken the relationship of acceptance intention and perceived usefulness. Our findings indicate some meaningful implications in the acceptance research of IOT services. First, we noted that the easy of use significantly affects the adoption of location-based IoT service. Furthermore, it is important to build the secured mechanism of privacy protection to adopt of location-based IoT service. Second, we tried to attempt the newly integrated approach to technical acceptance using UTAUT's variables and ELM by Petty and Cacioppo (1986). Finally this research empirically analyzed the adoption case of location-based IoT service which is not well-known yet within our country.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2018.07a
• /
• pp.513-514
• /
• 2018

Recently, IoT(Internet of Things) technology is being actively used to develop smart products and services. This paper proposes the architecture and major functionalities of IoT outdoor exercise equipment using ARTIK IoT Platform. It provides an exerciser with date&time, weather information, the amount of exercise. The amount of exercise and a user's ID are sent to a service server by LTE-M modem and the server provides the exercise history by web or smartphone app. As additional functionalities, a fine dust alarm light and an emergency alarm button are embedded. The proposed system has been exhibited on CHINA SPORT SHOW 2018 held on Shanghai, China.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2017.05a
• /
• pp.215-216
• /
• 2017

In recent years, the quality of our lives has been improved by providing services that utilize IoT(Internet of Things) technology in various fields. The information obtained through IoT technology provides a basis for actively providing services that people want. However, in the field of smart healthcare, there are a lot of restrictions due to legal regulations and policies due to the scope of handling not only personal information but also simple medical information. Therefore, this study examines the legal systems and policies in the field of smart healthcare and examines the direction of smart healthcare.