• JSTS:Journal of Semiconductor Technology and Science
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• v.17 no.1
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• pp.56-64
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• 2017

In this paper, an advanced ZigBee (AZB) system for internet-of-things (IoT) applications is proposed which can support various data rates from 31.25 Kbps to 2 Mbps, and the implementation results of the AZB baseband processor are presented. Repetition coding for 32-chip direct-sequence spread spectrum (DSSS) symbol is applied for low rates under 250 Kbps to extend the coverage. Convolution coding, puncturing, and interleaving for non-DSSS symbol are performed for high rates from 500 Kbps to 2 Mbps for multi-media services. Simulation results show that the coverage increases at the rate of 51.8-77.3% for various environments compared with IEEE 802.15.4 ZigBee. AZB baseband processor was implemented in 180 nm CMOS process and total gate counts are 260K with the size of $5.8mm^2$.

• International Journal of Internet, Broadcasting and Communication
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• v.12 no.2
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• pp.66-76
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• 2020

We The 4th industrial revolution, the core characteristics of super-intelligence, hyper-connective, and ultrareality, has been actualized. New technologies such as artificial intelligence, big data, the Internet of Things, and high-tech video have begun to be applied to media and advertising. With the introduction of new technologies in the advertising field, innovative changes in advertising types, advertising effects, advertising methods, and advertising contents are expected. Accordingly, We intends to design a future advertising roadmap development by predicting how future advertising will change and develop through future technologies in the 4th industrial revolution era. To design the roadmap, this study analyzes changes in advertising technology, consumer, and media as changes in the advertising environment in the 4th industrial revolution era, and identifies the core changing trends, advertising factors in future advertising through the Delphi Survey on experts in advertising and future fields. We identifies how the future advertising technology, types, media, effects, and fields are developed by the changes of future advertising environments, including technology, consumers, and media in the 4th industrial revolution era. Hence it is expected to help the advertising industry and experts to prepare for future changes.

• Journal of Internet of Things and Convergence
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• v.9 no.6
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• pp.125-134
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• 2023

The purpose of this paper is to propose a method to improve the performance of the previous research is characterized by recognizing facial gestures from the 3D coordinates of seven landmarks selected from the MediaPipe Face Mesh model, generating corresponding user events, and executing corresponding commands. The proposed method applied adaptive moving average processing to the cursor positions in the process to stabilize the cursor by alleviating microtremor, and improved performance by blocking temporary opening/closing discrepancies between both eyes when opening and closing both eyes simultaneously. As a result of the usability evaluation of the proposed facial gesture interface, it was confirmed that the average recognition rate of facial gestures was increased to 98.7% compared to 95.8% in the previous research.

• Smart Media Journal
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• v.13 no.4
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• pp.76-85
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• 2024

In this paper, we propose a system that improves the data integrity of IoT(Internet of Things) devices in the virtual environment by combining Hyperledger Indy and MQTT(Message Queuing Telemetry Transport). The system complements the limitations of the centralized system by realizing a DPKI(Decentralized Public Key Infrastructure) structure that utilizes a distributed network in publish-subscribe(pub/sub) pattern communication. Digital signature technology was applied to ensure the data integrity of IoT devices and communication scenarios between the four core components of the client, IoT device, broker, and blockchain, as well as a topic structure using a decentralized identifier to ensure safety in the virtual environment. We present a systematic method for transparent data exchange. To prove the performance of the proposed system, this paper conducted experiments on four scenarios and evaluated communication performance in a virtual environment. The experimental results confirmed that the proposed system provides a reliable IoT data communication structure in a virtual environment.

• Journal of the Korea Convergence Society
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• v.12 no.5
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• pp.9-16
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• 2021

Due to the prolonged infectious disease of COVID-19 worldwide, there are various security threats due to network attacks on Internet of Things devices that are vulnerable to telecommuting. Initially, users of Internet of Things devices were exploited for vulnerabilities in Remote Desktop Protocol, spear phishing and APT attacks. Since then, the technology of network attacks has gradually evolved, exploiting the simple service discovery protocol of Internet of Things devices, and DRDoS attacks have continued to increase. Existing SSDPs are accessible to unauthorized devices on the network, resulting in problems with information disclosure and amplification attacks on SSDP servers. To compensate for the problem with the authentication procedure of existing SSDPs, we propose a hash-based SSDP that encrypts server-specific information with hash and adds authentication fields to both Notify and M-Search message packets to determine whether an authorized IoT device is present.

• Journal of Digital Convergence
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• v.20 no.5
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• pp.61-68
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• 2022

This study examines the impact of consumers' subjective perception on the quality loyalty of the Internet of things, explores academic innovation schemes, and puts forward business strategies for on-site optimization of the industry. The research methods use online survey methods for Chinese consumers who have used or bought Xiaomi IoT products. The results show that the inherent attributes of Internet of things products have an impact on brand image, and brand image has an impact on customer loyalty. Brand image shows complete media effect in the relationship between hyper-connectivity and customer loyalty of Internet of things products. For the enterprises that develop the Internet of things, obtaining the perceived brand image has a very important strategic significance in expanding the loyal customer base.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.3
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• pp.1-6
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• 2015

The IoT(Internet of things) technology enable objects around user to be connected with each other for sharing information. To support security is the mandatory requirement in IoT because it is related to the disclosure of private information but also directly related to the human safety. However, it is difficult to apply traditional security mechanism into lightweight devices. This is owing to the fact that many IoT devices are generally resource constrained and powered by battery. PSK(Pre-Shared Key) based approach, which share secret key in advance between communication entities thereafter operate security functions, is suitable for light-weight device. That is because PSK is costly efficient than a session key establishment approach based on public key algorithm. However, how to safely set a PSK of the lightweight device in advance is a difficult issue because input/output interfaces such as keyboard or display are constrained in general lightweight devices. To solve the problem, we propose and develop a secure PSK configuration scheme for resource constrained devices in IoT.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.11a
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• pp.197-200
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• 2018

본 논문에서는 미디어사물인터넷의 기본적인 기능인 미디어사물을 발견하고 연결하는 과정에 필요한 API 및 프로세스에 대해 설명한다. 또한 미디어사물의 기능, 자원, 데이터를 사용하기 위해 필요한 미디어사물거래 API 와 이의 프로세스를 설명한다. 기본적인 순서로 가장 먼저 미디어사물을 발견할 때, 기능을 기반으로 발견하고 연결하여 해당 기능에 대한 사용권을 선점한다. 미디어사물이 연결된 후에 해당 기능을 사용하는데 필요한 비용에 따라 해당 미디어 토큰을 지불하고, 지불한 만큼의 시간 동안 기능을 사용하는 과정을 시퀀스 다이어그램을 통해 설명하고 각각 필요한 API 를 설명한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2021.06a
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• pp.170-172
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• 2021

최근 메타버스, 디지털트윈 등 산업계의 요구가 높아지고, 아울러 스마트홈, 스마트시티, 스마트팩토리와 같은 사물인터넷을 근간으로 하는 상용화 기술의 발전이 가속화되고 있다. 현실 세계의 센서와 구동기의 연결을 통해 사물들을 통한 현실세계 인식 및 제어에 초점을 맞추어 왔던 기존 사물인터넷 기술에서 이제는 사물 간 자율협업을 통한 문제 해결에 대한 요구가 커지고 있다. 본 논문은 미디어사물인터넷 국제표준인 MPEG-IoMT의 아키텍처 및 유스케이스를 통해 미디어사물의 자율협업에 대한 기본적인 개념을 전달하려 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.06a
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• pp.288-290
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• 2019

본 논문에서는 블록체인 및 암호화폐(토큰)를 이용해 미디어사물인터넷 내 카메라로부터의 비디오 스트리밍 서비스를 제공하는 시스템을 제안한다. 사용자가 분산형 애플리케이션을 통해 블록체인 상에 작성되어 있는 스마트 컨트랙트의 계약조건에 따라 토큰을 지불하고, 토큰을 지불 받은 IP 카메라는 촬영하고 있는 동영상을 실시간으로 사용자에게 스트리밍하는 시나리오를 구성하였다. 블록체인 카메라 스트리밍 서비스의 가능성을 알아보기 위해, 이더리움 기반의 블록체인 위에 스트리밍 서비스를 위한 스마트 컨트랙트를 업로드하고, 거래에 필요한 ERC20 토큰을 제작하여 시스템을 구현하였다.