지능형 Self-Organizing Network를 위한 설명 가능한 기계학습 연구 동향

권동승,나지현,D.S. Kwon,J.H. Na 한국전자통신연구원 2023 전자통신동향분석 Vol.38 No.6

As artificial intelligence has become commonplace in various fields, the transparency of AI in its development and implementation has become an important issue. In safety-critical areas, the eXplainable and/or understandable of artificial intelligence is being actively studied. On the other hand, machine learning have been applied to the intelligence of self-organizing network (SON), but transparency in this application has been neglected, despite the critical decision-makings in the operation of mobile communication systems. We describes concepts of eXplainable machine learning (ML), along with research trends, major issues, and research directions. After summarizing the ML research on SON, research directions are analyzed for explainable ML required in intelligent SON of beyond 5G and 6G communication.

수중 무선광통신 기술동향 Underwater Wireless Optical Communication

권동승 대한전자공학회 2018 전자공학회지 Vol.45 No.5

ITU-T에서 분산원장기술 표준화 동향

권동승,박종대,Kwon, D.S.,Park, J.D. 한국전자통신연구원 2020 전자통신동향분석 Vol.35 No.2

Distributed Ledger Technology (DLT) refers to a process and related technologies that enable a person to safely suggest, verify, and record state changes (usually updates) to synchronize ledgers distributed across network nodes. DLTs are becoming increasingly important as data management requirements evolve. Therefore, they need to understand the current state of standards (such as distributed storage and access technologies) to address future requirements. This paper provides ITU-T FG-DLT standard activities, such as standardization ization trends, use cases, reference architectures, platform evaluation criteria and future prospects.

디지털 신뢰 사회 실현을 위한 디지털 아이덴티티 동향

권동승,이현,박종대,Kwon, D.S.,Lee, H.,Park, J.D. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.3

The Internet was designed for machines, not humans, and hence, nobody owns a digital identity. Instead, a digital identity is rented from a website and an application. This lack of unique and secure digital identities has resulted in confusion in the online/cyber world. Digital identities pose one of the oldest and most difficult problems with regard to the Internet. There is still no way to use digital credentials to prove, own, and control an online identity, namely a self-sovereign identity, in the same manner we do in the offline world, particularly without a trusted third party. This article discusses the current open standards for digital identities, proposes solutions pertaining to digital identities in the future, and introduces the concept of a blockchain-based self-sovereign digital identity without the need of trusted third parties.

A Study on Microwave Self Oscillating Mixer Using Ga As MESFET

권동승,채종석,박한규,Kwon, Dong Seung,Chae, Jong Seok,Park, Han Kyu The Institute of Electronics and Information Engin 1987 전자공학회논문지 Vol.24 No.3

In this paper, self-oscillating mixer is designed by small signal S-parameter and series feedback circuit. The input-output matching circuit is accomplished from double stub and additional matching stub. The self-oscillating mixer is oscillating itself and amplifies without any external local oscillator and an intermediate frequency amplifier, so it has advantages in its economical and system simplification. The experimental results show the maximum conversion gain 1.5d B and the noise figure 6.5d B at RF center frequency 4GHz and IF 1.1GHz` output oscillating power 4d Bm, efficiency 13.4%, stability -10MHz/V and -0.5MHz/\ulcornerC at oscillating frequency 5.1GHz.The rejection band loss characteristics in band pass filter and low pass filter are -40d B and -30d B, respectively.

5G 스몰셀 기술 및 활용 기술 동향

권동승,나지현,Kwon, D.S.,Na, J.H. 한국전자통신연구원 2022 전자통신동향분석 Vol.37 No.2

5G goes beyond people to serve indoor and outdoor companies and industries, as well as campuses such as halls, industrial complexes, educational institutions, stadiums, dense urban areas, rural areas, and government institutions. Therefore, a new approach to small cells is needed. Accordingly, 3GPP and Small Cell Forum are researching 5G small cell architecture; 3GPP, Small Cell Forum, and 5G Alliance for Connected Industries and Automation are also researching private networks tailored to meet the specific requirements of various companies and local governments. In particular, in the UK, a small cell-based technology is required for realizing the Joint Operator Technical Specifications-Neutral Host In-Building specification to cost-effectively secure indoor coverage. Further, the research on the SON(Self-Organizing Network) technology for small cells in 5G, where commercialization has begun, is required. The 5G-based small cell structure, private network, and Neutral Host In-Building and SON reviewed in this study are at the initial research stages; therefore, additional research is needed to secure the competitiveness of the small cell technology in 5G and Beyond 5G.

지능형 재구성 안테나 특허 동향

권동승,Kwon, D.S. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.3

To accommodate various mobile communication frequency bands, the study of metamaterial antennas have begun since the mid-2000s to solve the Trilemma problem between antenna gain-occupied bandwidth-size. As an adaptive reconfiguration function is required in a multi-array antenna system since 4G, the metamaterial array antenna using low-power variable elements has been used to change the basic structure of the antenna. Recently, reconfigurable intelligent surface (RIS), which is made of metasurface with reconfigurability, has been studied to effectively cope with the randomly varying radio channels and be used for various purposes such as reflection/transmission/modulation. As a result of RIS-related patent information analysis in this study, it was confirmed that most of the patents are metamaterial antennas and metamaterial array antennas, but the metasurface antenna technology was in the early stages. Particularly, as the intelligent metasurface antenna is in a more initial stage, the investment to R&D of RIS is urgent to secure patent competitiveness in B5G and 6G.

휴대인터넷 무선접속규격의 핵심 요소 기술 분석

권동승,유병한,황승구 한국통신학회 2004 정보와 통신 Vol.21 No.7

이동통신은 아날로그 음성을 전달하는1세대의 아날로그 이동 전화로부터 시작하여 2세대의 디지털 이동통신에서는 디지털 음성 전화 및 단문서비스를 제공하였으며, 3세대 이동통신시스템인 IMT-2000(International Mobile Telecommunications-2000)으로는 동기 방식 cdma2000과 비동기 방식의 W-CDMA에서는 2Mbps급 이상의 데이터 서비스를 제공한다. 현재 서비스 중이거나 계획 중인 WCDMA, cdma2000 1x,cdma2000 1x EVDO와 EVDV는 이동 멀티미디어 서비스의 제공을 목표로 설계되었으나, 현재 이들 3세대 시스템은 2세대 시스템에 비하여 기술적으로 진보된 개념들을 도입하였음에도 불구하고, 서비스 제공 관점에서 2세대 시스템과의 차별화에 성공적으로 대처하지 못하고 있고, 2세대 시스템이 이동전화 서비스를 제공하는데 있어 용량 부족의 문제가 없으므로 사업자들이 신규 투자에 매우 소극적인 상황이다.(중략)

심화 학습 기반 이동통신기술 연구 동향

권동승,Kwon, D.S. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.6

The unprecedented demands of mobile communication networks by the rapid rising popularity of mobile applications and services require future networks to support the exploding mobile traffic volumes, the real time extraction of fine-rained analytics, and the agile management of network resources, so as to maximize user experience. To fulfill these needs, research on the use of emerging deep learning techniques in future mobile systems has recently emerged; as such, this study deals with deep learning based mobile communication research activities. A thorough survey of the literature, conference, and workshops on deep learning for mobile communication networks is conducted. Finally, concluding remarks describe the major future research directions in this field.

공진 이득 방법에 의한 마이크로스트립 안테나의 이득 증가에 관한 연구 ( A Study on the Gain Enhancement of Microstrip Antenna using Resonance Gain Technique )

권동승,김남수,박한규 대한전자공학회 1986 대한전자공학회 학술대회 Vol.1986 No.1