DCM을 사용하는 MB-OFDM 시스템에서 채널 정보를 이용한 향상된 연판정 복조 기법

구본욱,강병수,송형규,Koo, Bon-Wook,Kang, Byung-Su,Song, Hyoung-Kyu 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.5A

MB-OFDM UWB 시스템은 고속의 전송률을 달성하기위해 16-QAM형태의 dual carrier modulation(DCM)방식을 이용한다. DCM의 기본 아이디어는 4개의 입력비트를 서로 다른 형태의 2개의 16-QAM을 이용해 변조하고 2개의 변조결과를 최대한 멀리 떨어져 있는 2개의 OFDM 부반송파에 나눠서 중복 전송함으로써 하나의 부반송파가 복구할 수 없는 페이딩을 겪게 되더라도 다른 하나의 부반송파에 실려온 정보를 이용하여 전송한 4비트를 복조할 수 있다는 것이다. 두 개의 부반송파가 모두 열악한 페이딩을 겪게 될 확률은 매우 작으므로 DCM을 이용함으로써 성능향상을 기대할 수 있다. 기본적인 ML검출방식을 이용하여 신호를 복호할 경우 채널정보를 이용하지 않기 때문에 DCM의 본래 목적이라고 할 수 있는 다이버시티의 손실(loss in diversity)을 줄이자는 생각과 부합되지 않는다. 본 논문에서는 채널 상태 정보라는 여분의 신뢰할 만한 정보를 이용함으로써 더 좋은 성능을 얻을 수 있는 향상된 연판정 복조기법을 제안한다. MB-OFDM (Multiband-orthogonal frequency division multiplexing) UWB (ultra wide band) system uses DCM (dual carrier modulation) scheme to achieve high-data rate transmission. The basic idea of DCM is that to transmit the 4 bits more reliably two 16-QAM (quadrature amplitude modulation) symbols are used and the two 16-QAM sysmbols are allocated to each subcarrier of OFDM with maximum-distance. In the case of using the DCM, if one 16-QAM symbol is broken by deep fadding channel, a receiver can detect the transmitted signal by using another 16-QAM symbol. In the conventional ML(maximum likelihood) decision scheme, since the receiver does not use the CSI (channel state information), loss in diversity can not be reduced. In this paper, we propose improved soft-decision scheme with CSI for higher performance of MB-OFDM UWB systemn.

소결 온도와 유지 시간에 따른 Fe-Cr-Al 다공성 금속의 제조

구본욱,이수인,박다희,윤중열,김병기,Koo, Bon-Uk,Lee, Su-In,Park, Dahee,Yun, Jung-Yeul,Kim, Byoung-Kee 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.2

The porous metals are known as relatively excellent characteristic such as large surface area, light, lower heat capacity, high toughness and permeability. The Fe-Cr-Al alloys have high corrosion resistance, heat resistance and chemical stability for high temperature applications. And then many researches are developed the Fe-Cr-Al porous metals for exhaust gas filter, hydrogen reformer catalyst support and chemical filter. In this study, the Fe-Cr-Al porous metals are developed with Fe-22Cr-6Al(wt) powder using powder compaction method. The mean size of Fe-22Cr-6Al(wt) powders is about $42.69{\mu}m$. In order to control pore size and porosity, Fe-Cr-Al powders are sintered at $1200{\sim}1450^{\circ}C$ and different sintering maintenance as 1~4 hours. The powders are pressed on disk shapes of 3 mm thickness using uniaxial press machine and sintered in high vacuum condition. The pore properties are evaluated using capillary flow porometer. As sintering temperature increased, relative density is increased from 73% to 96% and porosity, pore size are decreased from 27 to 3.3%, from 3.1 to $1.8{\mu}m$ respectively. When the sintering time is increased, the relative density is also increased from 76.5% to 84.7% and porosity, pore size are decreased from 23.5% to 15.3%, from 2.7 to $2.08{\mu}m$ respectively.

두문동(杜門洞) 칠십이현(七十二賢)과 송은(松隱) 구홍(具鴻)의 절의정신(節義精神)

구본욱 ( Bon Wook Koo ) 경북대학교 퇴계학연구소 2005 퇴계학과 유교문화 Vol.37 No.-

초임계수를 이용한 표고버섯 골목의 가수분해

구본욱 ( Bon Wook Koo ),이재원 ( Jae Won Lee ),최준원 ( Joon Weon Choi ),최돈하 ( Don Ha Choi ),최인규 ( In Gyu Choi ) 한국목재공학회 2006 목재공학 Vol.34 No.6

논문(論文) : 계동(溪東) 전경창(全慶昌)의 연보작성(年譜作成)을 위한 시론(試論)

구본욱 ( Bon Wook Koo ) 대구사학회 2012 대구사학 Vol.107 No.-

Gyedong Jeon Kyung-chang(溪東 全慶昌) was a Confucian scholar who was born in Daegu in the mid-Chosun Dynasty. At the age of 24, he passed jinsasi(進士試), the first state examination for office. When he was 42, he passed gwageo(科擧), the highest-level state examination for civil service. After various government posts, he finally reached the position of jipyong(持平) in the Ministry of Saheonbu(司憲府). As a disciple of Toegye Yi Hwang(退溪 李滉), he became the first one to initiate Toegye Studies(退溪學) throughout the Daegu area. He didn`t live long enough, though. At the age of 54, he passed away in Seoul away from home. Later on, when the Japanese Invasion of Korea(壬辰倭亂) broke out in 1592, most of his posthumous works were lost, leaving behind, in his collection of works, just one prose(賦), five verses(詩), three letters of appeal to the king(疏) and two miscellaneous articles(雜著). Actually, it was from various writings of his colleagues that considerable data on him could be acquired. On the basis of such data, a chronology could be completed within this thesis so that it could help with further researches on his life, his learning, his lectures, his life as a civil servant and his influences on younger students. The thesis divides his life into four phases and looks into his teacher-pupil relationships which cover from his teacher Toegye(退溪) to such Confucian scholars as Son Choe-null(孫處訥), Yi Joo(李輳), Seo Sa-won(徐思遠), Kwak Jae-gyum(郭再謙), Ryu Yo-shin(柳堯臣) and Jung Kwang-chon(鄭光天). His literary colleagues pursued studies at such lecture halls as Yeongyeong Seowon School(硏經書院), Sonsajae School(仙査齋) and Youngmodang School(永慕堂), elevating Confucianism in the Daegu area to a distinguished academic order. Jeon Kyung-chang provided a foundation for the Daegu Confucianism to open a dawn of the Renaissance. The chronology in the thesis is mainly on Jeon Kyung-chang. However, it, at the same time, deals with his contemporary colleagues who were with him in the quest for academic scholarship, therefore providing knowledge on the flow and development of the Daegu Confucianism. Also included in the chronology are articles written by his older brother, his nephews and his daughters` descendants, since his academic scholarly works were succeeded by them along with his literary colleagues. The chronology encompasses not only his 54 years of life but also the following 424 years after his death in an effort to organize those items involving him even after his passing. The fact that Confucianism in and around Daegu is still under his influence is another reason for the chronology to extend into his after-death periods. At the end of the thesis is a list of eulogies, both verses and proses, offered by the officials and friends in his memory after his death. The list of literary works referred in the making of the chronology is also available at the end of the thesis.

이태리 포플러의 화학적 전처리 공정을 통한 효소가수분해 영향 인자 분석

구본욱 ( Bon Wook Koo ),박나현 ( Na Hyun Park ),여환명 ( Hwan Myeong Yeo ),김훈 ( Hoon Kim ),최인규 ( In Gyu Choi ) 한국목재공학회 2009 목재공학 Vol.37 No.3

나노셀룰로오스의 화학적 표면개질을 통한 생분해성 소재 및 전지 소재 적용 연구

구본욱(Bonwook Koo),조재민(Jaemin Jo),이준혁(Junhyeok Lee) 한국펄프·종이공학회 2023 한국펄프·종이공학회 학술발표논문집 Vol.2023 No.4

표고버섯 골목의 사용연수에 따른 화학적, 물리적 성상 및 폭쇄처리 후 변화 관찰

구본욱 ( Bon Wook Koo ),박준영 ( Jun Yeong Park ),이수민 ( Soo Min Lee ),최돈하 ( Don Ha Choi ),최인규 ( In Gyu Choi ) 한국목재공학회 2005 목재공학 Vol.33 No.1

고령지역 국채보상운동의 전개과정에 관한 고찰- 홍와 이두훈 가(家)의 고문서를 중심으로 -

구본욱 ( Koo Bon-wook ),이경규 ( Lee Keong-gwoo ) 대구가톨릭대학교 인문과학연구소 2017 인문과학연구 Vol.0 No.31

This thesis deals with how the National Debt Redemption Movement, which had originally gotten started in Daegu, spread to and developed in the Goryeong area, how the donation for the cause materialized and how the donated fund found its way for the redemption. Up to the present time, most of the studies concerning the movement have been conducted around secondary sources such as newspapers clips published at the time of the movement. Then came a turning point in 2013 in the study when primary sources were unearthed in the Yi Doo-hoon`s household. What were found there were not only original official documents exchanged between Daegu, the then head place of the movement, and Goryeong but also those sent to the United National Debt Assembly in Seoul. Their excavations brought about calls requesting a transfer in the way of the studies from around secondary sources to around primary ones which are, of course, original texts. Capitalizing on these original texts, this thesis focuses on the national debt redemption movement in the Goryeong area. Since the texts were written nearly a century ago, there are quite a number of differences in the linguistic usages between now and then. In that context, this thesis has translated and contemplated the original texts with the texts marked in the footnotes. It is ture that this thesis limits its study sphere to the Goryeong area, but a further application of this case is sure to provide a clue to finding out how such movements spread out to other areas and eventually to the nation.

프로야구단의 위기커뮤니케이션 전략 분석: 메시지 소구 및 기사제시 방식을 중심으로

구본욱 ( Bon-uk Koo ),원동천 ( Dong-chun Won ),임충훈 ( Choong Hoon Lim ) 한국스포츠정책과학원(구 한국스포츠개발원) 2017 체육과학연구 Vol.28 No.3

[목적] 본 연구의 목적은 구단이 위기상황에 놓였을 때 사과 기사를 제공함에 있어 메시지 소구 및 기사제시 방식에 따른 위기 커뮤니케이션 효과를 알아보는 것이다. 구체적으로 프로야구단이 사과 기사를 전달함에 있어 이성적 중심의 사과 기사보다 감성적 중심의 사과 기사가 공중의 메시지 수용도에 긍정적인 영향을 미칠 것으로 예상하였으며 사과 기사에 사진을 포함하는 것이 그렇지 않을 때보다 공중의 메시지 수용도에 긍정적으로 영향을 미칠 것으로 예상하였다. [방법] 실제로 존재하는 프로야구단을 선정하고 승부조작이라는 위기상황을 가정하여 해당 구단이 사과 기사를 노출할 때, 사과 기사의 메시지 소구 방식(이성적 사과 기사 vs. 감성적 사과 기사)과 기사제시 방식(기사 vs. 기사+사진)에 따른 요인 설계 실험연구를 실시하였다. 실험은 340명을 대상으로 설문조사를 실시하였고 최종적으로 325부를 활용하였다. 자료 분석을 위하여 SPSS 23.0을 사용하였으며 기술통계분석(Descriptive Analysis), 확인적 요인분석(Confirmatory Factor Analysis), 신뢰도 분석(Reliability Analysis), t-검정(Independent t-test), 이원공분산분석(Two-way ANCOVA)을 실시하였다. [결과] 본 연구의 결과는 다음과 같다. 첫째, 프로야구단이 전달한 사과 기사에 대해 이성적 소구 방식의 사과 기사보다 감성적 소구 방식의 사과 기사가 공중의 메시지 수용도에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 프로야구단이 사과기사를 전달할 때 사진을 포함하는 것이 그렇지 않은 것보다 공중의 메시지 수용도 측면에 긍정적인 영향을 미친다는 것을 확인하였다. [Purpose] The purpose of this research was to investigate the influence of professional baseball teams' message appeal type (emotional vs. rational) and message delivery method (article with photo vs. article without photo) on consumers' acceptance of the message. The hypotheses were two folds. First, compared with a rational apology article, a professional team's emotional apology article affected consumers' acceptance more positively. Second, a professional team's apology article with a photo attached influenced consumers' acceptance more positively than one without a photo. [Methods] To achieve the purpose of this study, the authors utilized a 2 (Message Appeal Type: emotional vs. rational) × 2 (Message Delivery Method: article with photo vs. article without photo) factorial experiment. An existing baseball team was selected and was assumed to have been involved in a game fixing situation. Out of 340 participants, 325 were used in the final analysis. Two-way ANCOVA of SPSS 23.0 was conducted to analyze the data. [Results] Findings revealed when a professional baseball team issued an emotional apology article, consumers were more positive about it than a rational one. Also when a professional team delivered an article with a photo, consumers accepted the article more positively than the one without a photo.