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Frequency Offset Estimation Technique for MB-OFDM Based UWB Systems
황유모(Humor Hwang),Razi Ur Rehman 대한전기학회 2011 전기학회논문지 Vol.60 No.3
We propose a new frequency offset estimation technique for multiband orthogonal frequency modulation (MB-OFDM) based ultra wideband (UWB) systems. The proposed frequency offset estimation technique is related to the scheme of Schmidl for channel model 1 (4-1Om NLOS, rms. delay =14.3㎱.) using more than two symbols and with alternate symbols. Variance of frequency offset estimate obtained from the proposed frequency offset estimation technique approaches very nearing to Cramer Rao Lower Bound (CRLB) in an AWGN channel. BER performance of the proposed technique is also presented.
황유모(Humor Hwang),장철호(Chulho Chang),송진호(Jinho Song) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
For large capacity optical CDMA networks, we propose a shared-type encoder/decoder based on an tunable wavelength conveter (TWC) and an arrayed waveguide grating (AWG) router. Feasibility of the structure of the proposed encoder/decoder for dynamic code allocation is tested through simulations using three types of wavelength/time 2-D codes, which are the generalized multi-wavelength prime code(GMWPC), the generalized multi-wavelength Reed-Solomon code(GMWRSC) and the matrix code. Test results show that the proposed encoder/decoder can increase the channel efficiency not only by increasing the number of simultaneous users without any multiple-access interference but by using a relatively short length CDMA codes.
스펙트럼 공유를 위한 직교 주파수 분할 다중 (OFDM) 시스템에서의 사이드로브 억압 기법
황유모(Humor Hwang),Saleem Ahmed 대한전기학회 2009 전기학회논문지 Vol.58 No.8
We propose a new technique for sidelobe suppression in orthogonal frequency division multiplexing (OFDM) systems. Sidelobe suppression is an essential technique to design OFDM based overlay system. The proposed technique is based on the combination of the multiple choice sequence (MCS) with the conventional windowing of OFDM signal in time domain. The MCS is choosing the one sequence which has lowest power in sidelobes from the produced set of sequences. The main advantage of proposed technique is that it fully utilizes the available bandwidth to transmit data. Simulation results show that by combining MCS with conventional windowing technique, the sidelobes in OFDM system can be significantly reduced.
New Encoder/Decoder with Wavelength/Time 2-D Codes for Optical CDMA Network
황유모(Humor Hwang) 대한전기학회 2009 전기학회논문지 Vol.58 No.5
We propose a new encoder/decoders based on an tuneable wavelength converter (TWC) and an arrayed waveguide grating (AWG) router for large capacity optical CDMA networks. The proposed encoder/decoder treats codewords of wavelength/time 2-D code simultaneously using the dynamic code allocation property of the TWC and the cyclic property of the AWG router, and multiple subscribers can share the encoder/decoder in networks. Feasibility of the structure of the proposed encoder/decoder for dynamic code allocation is tested through simulations using two wavelength/time 2-D codes, which are the generalized multi-wavelength prime code (GMWPC) and the generalized multi-wavelength Reed-Solomon code (GMWRSC). Test results show that the proposed encoder/decoder can increase the channel efficiency not only by increasing the number of simultaneous users without any multiple-access interference but by using a relatively short length CDMA codes.
개방형 한국어 지식 대사전 전문용어 신분류 체계 설정 및 재분류
황유모(Humor Hwang),김정훈(Jung-Hoon Kim) 대한전기학회 2015 전기학회논문지 Vol.64 No.2
A new classification system with 9 main categories and 56 subcategories for the Open Korean Knowledge Dictionary is proposed. The classification system setup is to prepare for the standard classification system to be used to manage effectively vast of terminologies which were published in the Open Korean Knowledge Dictionary and is meant to enhance the fifteen-year old classification system for the standard korean great dictionary to match up to the trend of the modern terminology. The new terminology classification system covering all the academic areas such as humanity, sociology, politics, science, medicine, agriculture, engineering, etc, is designed and proposed after investigating several classification systems. The classification system setup procedures follow as ? The classification system is designed and planed by both the classification system and the academic expert. ? Classification system design covers all the academic areas following National Science and Technology standard classification system after investigating several classification systems such as the National Research Foundation, National Science and Technology Standard Act, Ministry of Knowledge Economy. ? Poll and survey is made to collect comments from total 93 members of several academic areas. ? The poll result is reviewed among working group members and utilized to update the new terminology classification system. Reclassifications are made for the around 200,000 terms in electricity, computer, medicine, pharmacy, biology, and economics according to the new terminology classification system.
선진화된 IEC 기술용어 표준화 구축절차 및 전산시스템
황유모(Humor Hwang),김정훈(Jung-Hoon Kim),문봉희(Bong-Hee Moon) 대한전기학회 2016 전기학회논문지 Vol.65 No.3
Through the correspondence works with international electrotechnical vocabulary(IEV) in the smart grid field and power information technology field, we analyzed cases for discussion of terms and definitions in the IEV and then proposed an advanced procedure and computing system for standardization of International Electronical Committee(IEC) terminologies. The standardization procedure consists of processes for existing terminology, new terminology and correspondent terminology which have different structures. An example of the standardization work of correspondent terminology is given. The standardization computing system are based on the process for terminology extraction, terminology verification and terminology management which could provide the Wikipedia type terminology search function. In order to prevent that there exist multiple terminologies in IEV, the database search system is needed to be developed. We proposed the ‘IEV_Term_Search’ program which is the database search system. Terminology standardization of different technical committees(TC) and completion of the IEV to promote cooperation between TC 1 and the TCs must be followed by revision and standardization using the standardization computing system.
Sidelobe Suppression Technique in OFDM System Based on Phase Optimization of Subcarriers
황유모(Humor Hwang),Shama Noreen 대한전기학회 2009 전기학회논문지 Vol.58 No.11
We propose a phase optimization technique for sidelobe suppression in OFDM system. The technique is based on idea that phase shift to some of the transmit symbols within the symbol constellation plane can lead to significant sidelobe suppression. The sidelobes are reduced by optimizing using iterative method the phases of some subcarriers on the left and right hand side of the used OFDM spectrum. The proposed technique requires a small amount of side information that needs to be transmitted. Simulation results show that the proposed technique can reduce the sidelobes by significant amount.
스마트그리드 용어 표준화를 위한 뜻풀이 작업 및 온라인 용어 정보시스템 개발
황유모(Humor Hwang),김정훈(Jung-Hoon Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.3
Power system technologies in the area of smart grid are being converged with communication system technologies or information technologies(IT). This interdisciplinary action affects on two parts vigorously so that IT has become a essential part of power industry. But terminologies of two parts are confused and it is necessary that these are standardized to develop the industry. The interpretation works with scientific and technological standard of the smart grid terminologies which are IEC TC 57 glossary and non-glossary terminologies are introduced. Based on the interpretation works of the smart grid terminologies, an online terminology information system for the standardization of smart grid terminologies is proposed. The system provides the capability of collection and delivery of academic society opinions for the selected and interpreted terminologies
IEC Electropedia 등재용 IEV 한국어 용어 정의를 위한 작업 시스템에 대한 연구
황유모(Humor Hwang),김정훈(Jung-Hoon Kim),손수국(Su-Goog Shon) 대한전기학회 2021 전기학회논문지 Vol.70 No.2
We proposed a definition DB of terms, term standardization procedures work templates and contents for implemantation of Korean Electropedia for registering IEV 21,222 definitions of Korean terms in Electropedia (IEV Online System) and demonstrated their effectiveness through case studies. It aims to be the first in the list of definition services of terms by languages other than English and French, currently available in Electropedia. Implementing the 2018 IEC TC 1 decision is a continuation of the 20,000 Korean terms projects listed in the 2018 IEC Electropedia. Definition development and registration are prepared in each language in major countries such as Korea and Germany. However, there is no standard procedure for registration, and there is no choice but to take different forms according to the circumstances of each country.