소프트웨어 모뎀 시공간 선 부호화 시스템의 채널 대칭성을 위한 CFO·STO·SCO 추정, 보상 기법

김수빈,이한결,이송민,김재홍,김주엽,정진곤 한국통신학회 2022 韓國通信學會論文誌 Vol.47 No.9

This study suggests CFO·STO·SCO estimation and compensation method for the spatial-diversity-achieving STLC system. As the knowledge of channel state information is available only at the transmitter, the STLC encoding is performed by exploiting the reciprocity between the uplink and downlink channels. Though the channel reciprocity is theoretically valid for the TDD system, the channel asymmetry occurs practically due to the effect of CFO·STO·SCO. Therefore, we propose a two-step estimation method that efficiently compensates the effect of CFO·STO. Furthermore, a compensation method was proposed to reduce SCO and residual phase offset. Through a software-defined modem-based single-input single-output system testbed, it is experimentally shown that the channel reciprocity is obtained form the proposed methods. 본 연구는 공간 다이버시티 이득을 얻는 시공간 선 부호화 시스템을 위한 CFO·STO·SCO 추정 및 보상 기법을제안한다. 송신단은 상향링크와 하향링크 채널 사이 대칭성을 가정하고 추정한 상향링크 채널 정보로 인코딩을 수행한다. 하지만, CFO·STO·SCO로 인한 채널 비대칭성 발생으로, 추정한 상향링크 채널 정보로 STLC 인코딩을 한경우, STLC 통신에 있어 공간 다이버시티 이득을 확보할 수 없다. 이에 본 연구에서는 CFO·STO를 효과적으로보상하는 이중 추정 기법과 SCO 및 잔여 위상 오차에 대한 추가 보상 기법을 제시한다. 또한, 소프트웨어 모뎀 기반 SISO 시스템 테스트베드를 구축하여 제안하는 기법을 통해 채널 대칭성이 확보됨을 실험적으로 검증한다.

태양광 전력 기반의 건설 타임랩스 촬영을 위한 저전력 시스템

권오성 한국지식정보기술학회 2017 한국지식정보기술학회 논문지 Vol.12 No.6

In this paper, we experimented the validity of our solar powered shooting system working even at power cut environment. Our new photographing system was composed by the rules of electric power consumption of components devices. To choose a appropriate device, we measured the electric current values of each individual device using the digital power analyzer. Our proposed shooting system was designed to suit the purpose of recording construction building process. The system could operate successfully without normal electric supply thanks to solar energy generating module. The shooting section of our system is composed of DSLR camera module, control computer and wireless communication module. We applied interval shooting method to reduce the electric consumption in our system. Since the period of construction projects would be long time, it is generally known that time-lapse photographing is exactly appropriate to record the construction process. in experiments, we could find that the consumption of an industrial computer installed to control DSLR(Digital Single Lens Reflex) camera and wireless modem was the greatest in comparison with the other devices. The relative consumption ratio was about 45%. On contrast, the camera module consumed 8.5 Watt and the modem device consumed 5.5 Watt. After the measurement of each component, we examined the entire consumption of our new system. In conclusion, we could confirmed that our proposed system was able to work within 300 watt solar power a day. Also, we could achieve 7.64% energy reduction effect using our new algorithm with varing shooting intervals.

통신위성 이용 멀티채널 양방향 시각비교 연구

양성훈(Sung-Hoon Yang),이창복(Chang-Bok Lee),이종구(Jong-Koo Lee),이영규(Young-Kyu Lee),이상정(Sang Jeong Lee) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.3

UTC (Coordinated Universal Time) has been made by the comparison results and the statistical analysis of primary clocks maintained by national standard institutes. Some kinds of technique have been used for international time transfer; since 1980s the study on methods and development of time transfer has conducted with activation of GPS application. And the more accurate and easier method made it use the official time transfer method for the generation of UTC. But recently TWSTFT (Two-Way Satellite Time and Frequency Transfers) as well as GPS time transfer are increasing in number because the TWSTFT is able to improve the accuracy and precision of time comparison owing to the elimination of the ionospheric and tropospheric delay errors thanks to the reciprocal propagation path. In this paper, we introduce the TWSTFT results by a multi-channel modem comparing with GPS P3-code.

한국형 전술데이터링크 시스템 구현을 위한 무선모뎀 시스템 설계

최효기,장호준,송영환,장동운,주재우,서난솔,Choi, Hyo-Ki,Jang, Ho-Joon,Song, Young-Hwan,Jang, Dhong-Woon,Joo, Jae-Woo,Seo, Nan-Sol 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.6

Next Generation Weapon system from the center of the platform to share information in real-time Network Centric Warfare(NCW: Network Centric Warfare) has been changed. Data link system is defined as a network. That is, all in real-time battlefield information is to enable sharing. Data link system is classified as a precision strike, Monitoring/control, control of a Patriot missile battery systems. These systems are most effective in a Joint warfare and precision strike. Data Link Systems(Data Communications) implementation is accomplished by using the KDLM(Korean Data Link Modem) and Radio Transceiver. KDLM is operated in conjunction with the legacy Radios(re-using fielded HF/VHF/UHF radio systems). In this paper, we describe in terms of KDLM system design. In this paper, the proposed design structure is how to effectively interact with legacy various radio. First, The results provide an analysis of that Dynamic TDMA system and apply modem structure. Radio characteristics data are necessary for an effective TDMA system design. This article analyzes the test results and describes the structure to improve the receive performance.

근대계몽기 국어교과의 성립 과정 연구

허재영 경북대학교사범대학부속 중등교육연구소 2005 중등교육연구 Vol.53 No.1

이 글은 근대계몽기(1880~1910)의 국어교과 성립 과정을 연구하기 위한 목적에서 쓰여진 글이다. 교과교육이 성립된 시기는 1895년 소학령과 1899년 중학교령에서부터이다. 그러나 1880년대 『한성주보』 및 개화사상가들의 상소문 등에서는 근대식 교육 제도의 도입과 교과교육의 필요성이 강하게 제기되었다. 이와 같은 배경에서 체계적이라고 볼 수는 없지만, 근대식 학교가 설립되었고, 갑오경장 이후로는 근대식 학제가 공식적으로 확립되었다. 근대식 학제 아래에서의 교과목은 주로 실용과목 중심이었다. 이는 각종 논설류나 학교 시행규칙을 통해서 확인할 수 있다. 이는 개화를 뒷받침하는 이론적 근거가 실용주의에 있었기 때문으로 보인다. 또한 학제의 도입을 뒷받침할 만한 경험적 토대도 마련되어 있지 않았기 때문에, 학제 도입, 학교 설립, 교과목 설치 등이 체계적일 수 없었고, 따라서 교육 내용과 교수 학습 방법 등도 초기의 상태를 벗어날 수 없었다. 그러나 1900년대를 지나면서, 근대식 교육 이론의 도입이나 교과에 대한 새로운 인식은 새로운 교육의 틀을 마련할 수 있었다. 하지만 아쉽게도 이 시기는 통감시대의 학정잠식이라는 시대적 한계 속에서 이루어졌다. 이를 고려한다 할지라도 국어교과가 공식적으로 등장하는 과정은 국어교과교육의 발전 과정에서 주목할 만한 일로 평가된다. 이는 국문에 대한 인식의 변화 과정과도 밀접한 관련을 맺고 있다. 이와 같은 입장에서 이 글은 ‘교과의 필요성과 국문의 실용성을 인식했던 시기(1880~1895)’, ‘독서 · 작문 · 습자라는 교과목이 존재했던 시기(1895~1905)’, ‘국어교과가 등장했던 시기(1906~1910)’,으로 시대를 세분하고, 그 과정에서 교과론의 전개 양상, 국문 인식의 변화, 국어교과의 변천을 살폈다. This study aimed to researched the history of established to Korean Subject in Enlightenment of Modern Recent Time(EMRT). In this time, civilization thinkers recognized the needs of educational system and the course of study. For example, PARK YOUNG HYO(박영효) appealed the needs of Korean education in school. But in this time, Korean government couldn't established school system. In 1895, Korean government promulgated to the rules of Educational Principles, so called ‘Kyo-Yuk Ip-Kuk Jo-Sed(교육입국조사)’ and the law of elementary school system(So-Hakgyo Ryeong : 소학교령). In 1899, the government promulgated the law of middle school system(Jung-Hakgyo Ryeong : 중학교령). The government promulgated these management principles of these school system, so called ‘So-Hakgyo Si-Haeng Gyu-Chik(중학교 시행 규칙)’. In these management principle, Korean subject was not founded, but we founded Dok-Seo(독서 : reading), Jak-Mun(작문 : writing), Se-Beop(서법 : the study of letters). But in this time, Korean enlightenment thinkers wrote many articles of importance of Korean. In 1906, Government promulgated Bo-Thong Hak-Gyo Ryeong(보통학교령) and Go-Dung Hak-Gyo Ryeong(고등학교령). The Subject of Korean established in these management of two Hak-Gyo Ryeong. The field of Korean constructed of Dok-Beop(독법 : the method of reading), Cheol-Beop(철법 : the method of writing) Se-Beop(서법 : the method of letters). In this time, Korean thinkers introduced scientific pedagogy, linguistics and the course study. For example, RYU GUN(류근, 1906), JANG EUNG-JIN(장웅진, 1907), JEONG YOUNG THAK(정영택, 1908) introduced these science. In 1910, Hak-Bu(the ministry of education) published the textbook of educational subject. The name of this textbooks was Bo-Thong Gyo-Yuk-Hak(보통교육학). We could found the changing shape of subject, and teaching method. But these changing were not meaned development, because in this time we were interfered by colonial power, so called Thong-Gam Bu(통감부).

이문구와 이문열 소설의 유교의 휴머니즘 연구

강찬모(Kang Chan-mo) 한국비평문학회 2008 批評文學 Vol.- No.30

This thesis is aimed at studying on ‘Confucian Humanism’ demonstrated in 『Kwanchon Essay』written by Lee Moon-ku and 『You might not go to your hometown again』written by Lee Moon-yeol. Lee Moon-ku and Lee Moon-yeol are the writers who attracted a lot of attention with unique literary style and peculiar subject among 1970’s and 1980’s Korean novels. Especially, two writers showed the same features of strong homesick and revival mood toward Confucian humanism in their novels above but, the distinction was noted between two writers in the way of the realization of Confucian humanism Lee Moon-ku focused on the humanity of a community based on familial love whereas Lee Moon-yeol focused on aristocratic familism, which requires our attention in that this difference implies the gap in literary identity and the aim between two writers. The concrete distinction was revealed at the part where characters recalled the two upper classes of old Korea and pursued the self-identity and concrete examples were shown through ‘Giant Pine Tree(왕소나무)’and ‘Eorimdae(御臨臺)’imaged as objective correlative. Lee Moon-ku correlated the damage of giant pine tree with absence of hometown whereas Lee Moon-yael correlated the Eorimdae with glory and pride of a relative by blood and emphasized it as the present objective for the continued pride until so far. In terms of the show-up of main characters, both writers tended to reproduce the traditional characters. Lee Moon-ku recollected community characters but, Lee Moon-yeol recalled the strong collateral relation by blood of Confucian scholars based on familism. In addition, they showed the outstanding difference in the attitude toward actual life. Lee Moon-ku focused on the realization of Confucian humanism through ‘review of Confucianism’ whereas Lee Moon-years Confucian humanism was individualized by private romanticism on glorious honor of a family.

근세시대의 헤어스타일 변천사 분석 및 작품재현

김숙자 ( Suk-ja Kim ) 한국미용예술경영학회 2008 미용예술경영연구 Vol.2 No.2

In this study I analyzed temporal characteristics of the Western modem age, tried to see how socio -cultural background was reflected in hair styles, and reproduced works through temporal considerations of hair styles. The purpose of this study is to understand the essence of beauty, keep balance between technical values of hair and its artistic aspect, and develop a new, originative and artistic hair design to understand and express society and culture of today. Romantic and feminine curls are shown as a typical expression of beauty, with differences in the degree between ages. Splendid, decorative, and exaggerated hair styles, such as Fontange and Pouf, in pursuit of this demand for beauty are works best showing human nature to express social status, authority, and ostentation. Contrary to other disciplines, beauty artists’ technical expertise is most of all important in hair ; by reproducing works of each age, it was found that the most beautiful human body formation could be expressed by balance and harmony between the technical expertise as the basis and artistry and creativity added. It is necessary to reproduce more hair designs of each age, which are insufficient in this study, analyze the essence of hair techniques, and produce new works to meet contemporary customers’ new needs.

3D AR 텔레오퍼레이션을 위한 5G 네트워크 전송장치의 상세 구현 및 성능 측정

구진모,이성창,강충식,문철준 제어로봇시스템학회 2023 제어로봇시스템학회 국내학술대회 논문집 Vol.2023 No.6

Design and Implementation of a Latency Efficient Encoder for LTE Systems

Soo Yun Hwang,Dae Ho Kim,Kyoung Son Jhang 한국전자통신연구원 2010 ETRI Journal Vol.32 No.4

The operation time of an encoder is one of the critical implementation issues for satisfying the timing requirements of Long Term Evolution (LTE) systems because the encoder is based on binary operations. In this paper, we propose a design and implementation of a latency efficient encoder for LTE systems. By virtue of 8-bit parallel processing of the cyclic redundancy checking attachment, code block (CB) segmentation, and a parallel processor, we are able to construct engines for turbo codings and rate matchings of each CB in a parallel fashion. Experimental results illustrate that although the total area and clock period of the proposed scheme are 19% and 6% larger than those of a conventional method based on a serial scheme, respectively, our parallel structure decreases the latency by about 32% to 65% compared with a serial structure. In particular, our approach is more latency efficient when the encoder processes a number of CBs. In addition, we apply the proposed scheme to a real system based on LTE, so that the timing requirement for ACK/NACK transmission is met by employing the encoder based on the parallel structure.

HFC망 기반 대칭형 멀티미디어 서비스를 위한 상향 채널 케이블 모뎀 설계

조병학(Byung Hak Cho) 한국방송·미디어공학회 2005 방송공학회논문지 Vol.10 No.3