• Journal of Korea Society of Digital Industry and Information Management
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• v.17 no.4
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• pp.13-28
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• 2021

The purpose of this study is to demonstrate the causal relationship between exhibition acceptance through the quality factors of Internet of Things (IoT) exhibition services and ease and usefulness of technology acceptance factors for domestic exhibition visitors. Through this, the company intends to present effective and efficient development plans in the IoT exhibition industry. Therefore, we present a research model that applies DeLone & McLean's quality factors to key variables in the information system success model and ease and usefulness in the Technology Acceptance Model (TAM). A survey was conducted on ordinary people with experience using the Internet of Water (IoT) exhibition service. The survey was conducted for two weeks from July 15 to August 20, 2021. A total of 276 surveys were used for data analysis during this period. The hypothesis results related to the information system success model of the Internet of Things (IoT) exhibition show that, first, system quality had no significant effect on usefulness, but significantly on ease. Second, information quality has been shown to have a significant effect on usability and ease. Third, service quality has been shown to have a significant impact on usability and ease. Fourth, usefulness has been shown to have a significant effect on exhibition acceptance. Fifth, ease has been shown to have a significant effect on usability. Sixth, ease was shown to have a significant effect on exhibition acceptance.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.1
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• pp.21-27
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• 2022

As society develops and becomes more complex, new and diverse types of disasters such as fine dust and infectious diseases are occurring. However, in the past, there was no PA(Public Address) system that provided accurate information to prepare for such a disaster. In this paper, we propose a public address system that automatically broadcasts an alarm by analyzing polluted air quality data collected from public data and IoT sensors. The warning level varies depending on the air quality, and the information provided by public data may show a significantly different result from the guide area due to various factors such as the distance from the measuring station or the wind direction. To compensate for this, we are going to propose a method for broadcasting by comparing and analyzing data obtained from public data and data from on-site IoT sensors.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.9-15
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• 2018

With the advent of the 5G communication era recently, advancement of the convergence technologies related to IoT has been progressed rapidly. IoT convergence technologies using various sensors are actively applied many fields in our lives, and it contributes to the popularization of these convergence technologies among many people successfully. The security problem of the IoT which connects many things on the network is critically vulnerable and is one of the most important challenge to be solved urgently. In this paper, we design an intrusion detection and self-treatment system for IoT, which can detect external attacks and anomalies in order to solve the security problems in IoT, perform self-treatment by operating the vaccine program according to the intrusion type whenever it detects certain intrusion. Furthermore, we consider the broadcasting of intrusion alarm message according to the frequency of similar circumstances in order to block intrusion contagious in IoT.

• Smart Media Journal
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• v.10 no.1
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• pp.88-98
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• 2021

As blockchain technology has emerged as a security issue for IoT, technology which integrates block chain into IoT is being studied. In this paper is a research concerning token-based IoT service access control technology for data sharing, which propose a possessor focused data sharing technic by using the permissioned blockchain. To share IoT health data, a Hyperledger Fabric Network consisting of three organizations was designed to provide a way to share data by applying different access control policies centered on device owners for different services. In the proposed system, the device owner issues access control tokens with different security levels applied to the participants in the organization, and the token issue information is shared through the distributed ledger of the HFN. In IoT, it is possible to lightweight the access control processing of IoT devices by granting tokens to service requesters who request access to data. Furthmore, by sharing token issuance information among network participants using HFN, the integrity of the token is guaranteed and all network participants can trust the token. The device owners can trust that their data is being used within their authorized rights, and control the collection and use of data.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.1
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• pp.90-96
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• 2019

Storage cabinet in a lab in these days measures various environmental factors in real-time with IoT sensors. Preexisting system collects sensor data, analyze a risk and then command other equipment. Such centralized control system tends to have an issue with of speed slowing down. It's because when there are more storage cabinets, there are more data to process. In order to solve this issue, this report addresses decentralized IoT sensor based lab safety control system. It can analyze internal state of storage cabinet to identify any hazardous situations and effectively control them. Such decentralized control system using sensor modules for internal environment of the cabinet storage and automated control algorithm based on administrator's log history can manage any hazardous situations by automated control of environment factors of inside a lab. It would allow users to deal with a hazard if it happens. Even better, it can prevent it to happen from the beginning.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.12
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• pp.1687-1692
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• 2019

In the era of the fourth industrial revolution, advanced technologies such as the Internet of Things(IoT) and big data are emerging. However, the level of application of IoT to indoor environment is very weak. Therefore, it is necessary to develop a system for analyzing air pollutants or indoor air quality through real-time monitoring using the IoT. This paper implements a system that measures indoor environmental values using Arduino and various sensors, and stores the information obtained from various sensors into a database of server. The information stored in the server was built as a database and utilized in the ventilation system or air cleaner installed in the home or company's room. In the proposed system, it is possible to check the immediate indoor environmental condition through the LED status display of the monitoring sensor module while reducing the cost of the sensor used to implement IoT technology.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.6
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• pp.2377-2397
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• 2020

Human activity recognition is widely used in smart homes, health care and indoor monitor. Traditional approaches all need hardware installation or wearable sensors, which incurs additional costs and imposes many restrictions on usage. Therefore, this paper presents a novel device-free activities recognition system based on the advanced wireless technologies. The fine-grained information channel state information (CSI) in the wireless channel is employed as the indicator of human activities. To improve accuracy, both amplitude and phase information of CSI are extracted and shaped into feature vectors for activities recognition. In addition, we discuss the classification accuracy of different features and select the most stable features for feature matrix. Our experimental evaluation in two laboratories of different size demonstrates that the proposed scheme can achieve an average accuracy over 95% and 90% in different scenarios.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.545-547
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• 2018

In fact, the importance of installation and management is getting bigger and bigger due to the accident prevention effect of motorway sleep. By introducing a management system using IoT technology based on the sleepover room located in the remote area, it provided a convenient system for users to develop the environment and managers by providing efficient management system for the management of the Korea Highway Corporation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.309-310
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• 2018

Recently, the systems for managing the labs provide services that can be managed in real time by using various sensors based on IoT. The system collects sensor data and transmits it to the server, identifies the dangerous situation, and sends operation commands to the devices. These systems have a centralized structure that slows data processing when managing multiple laboratories. To solve this problem, this paper proposes a system that manages laboratories in distributed processing environment to identify and manage risk situations. The sensor module is used to control the laboratory and to automatically identify and respond to the dangerous situation.

• Journal of Convergence for Information Technology
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• v.7 no.6
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• pp.173-179
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• 2017

Recently, with the development of IoT, there have been increasing cases of transmitting and receiving data by connecting more than one devices supporting various communication methods. In this paper, we propose a multi-terminal emulator supporting various communication methods. The system supports multiple channel connections for each communication method, schedules data transmission, collects communication statistics, represents them into graphs, and stores log records. By using this system, it is possible to test the communication connection between multiple devices, and it is expected to provide convenience for IoT system development.