http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박동찬,김석찬,Park, Dong-Chan,Kim, Suk-Chan 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.7C
이 논문에서는 BICM-OFDM(Bit Interleaved Coded modulation-Orthogonal Frequency Division Multiplexing) 시스템을 위한 비트 할당 기법에 대하여 연구한다. 부채널의 상태에 따라 부반송파의 전송 매개 변수를 조절하면 OFDM 시스템의 성능을 크게 개선시킬 수 있다. 여기서는 BICM-OFDM 시스템을 위한 적응 전송 기법으로 데이터 전송률을 일정하게 유지하면서 비트 오류율이 최소가 되도록 부반송파에 비트를 할당한다. 또한, 할당하는 비트 수가 정수인 제한 조건 하에서 최적의 해를 얻기 위해 이산 라그랑지 승수 방법을 사용한다. 모의실험을 통해 제안한 비트 할당 기법의 계산량이 크지 않으며, BICM-OFDM 시스템에 제안한 기법을 사용하면 약 $2\~3$ dB의 신호대 잡음비의 이득을 얻을 수 있음을 보인다. We consider an adaptive bit-loading technique for bit interleaved coded modulation-orthogonal frequency division multiplexing(BICM-OFDM) systems. By adjusting transmission parameter of each subcarrier adaptively depending on the subchannel state, the performance of OFDM system can be improved dramatically. In this paper, the number of bits for each subcarrier is allocated to minimize bit error rate keeping the constant throughput for the adaptive transmission technique of BICM-OFDM system which can be applied to real time transmission. Also, We use the discrete Lagrange multiplier method to get the optimum solution under the integer bit allocation constraint. Simulation results show that computational amount of the proposed bit allocation technique is not high and BICM-OfDM system using the proposed technique can get the SNR gain by 2$\~$3 dB over nonadaptive one.
박동찬,김석찬,Park Dong chan,Kim Suk chan 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.4c
적응 전송 기법은 변조방식, 부호율, 전력 등의 전송 매개변수를 채널의 상태에 적응시켜 무선 통신시스템의 성능을 향상시키는 기법이다. OFDM (Orthogonal frequency division multiplexing) 시스템에서는 이러한 적응기법을 부반송파별로 적용시킬 수 있다. 이 논문에서는 각 부채널의 상태에 따라 부반송파에 최적의 부호율을 적응시키는 적응부호율 OFDM 시스템을 고려한다. 성능 분석을 통해 적응부호율 OFDM 시스템이 비트오류율 $10^{-6}$에서 고정부호율 OFDM 시스템에 비해 $3\sim6$ dB의 신호 대 잡음비 이득 또는 $30\sim50\%$의 데이터 전송률 증가를 얻을 수 있음을 보인다. Adaptive transmission techniques can improve the performance of wireless communication system by adaptively changing the transmission parameter such as modulation, code-rate, and power according to the channel state. For orthogonal frequency division multiplexing (OFDM) system, the adaptive transmission techniques can be applied to each subcarrier unit. In this paper, we consider the adaptive code-rate OFDM system in which optimal code-rate is applied to each subcarrier according to the subchannel state. Performance analysis show that $3\sim6$dB gain of SNR or up to $30\sim50\%$ increase of data rate are achieved in the condition of bit error rate $10^{-6}$.
박동찬 ( Don Tchane Park ) 한국불어불문학회 1996 불어불문학연구 Vol.32 No.1
Notre e´tude a pour objectif de re´soudre le proble`me de la diffe´rence et de l`unite´ dans les oeuvres de Sade. Sade est producteur de deux sortes de textes; l`un est obsce`ne et dangereux donc sujet a` la censure, l`autre est plus conforme aux normes. Sade n`a-t-il pas e´te´ cohe´rent dans son e´criture romanesque? Depuis que Sade est sorti de l`enfer de la bibliothe`que, on ne parle que du Divin Marquis, l`auteur des Cent vingt journe´es de Sodome et de Justine, en oubliant l`auteur d`Aline et Valcour. L`image du `Sade e´crivain` nous e´tant pre´dominante, nous ne voulions perdre ni l`un, ni l`autre. Mais, d`abord, il fallait bien mesurer la diffe´rence entre deux mondes romanesques (nous avons choisi La Nouvelle Justine et Aline et Valcour comme repre´sentant de chaque monde). Dans La Nouvelle Justine, nous avons releve´ une e´criture libertine dont l`art est de repre´senter des fantasmes irrepre´sentables et qui pousse a` l`extre^me les ide´es immorales. Par contre, dans Aline et Valcour, nous avons remarque´ une e´criture d`un homme de lettres classiques qui de´voile les plis du coeur humain a` mesure que l`histoire se de´veloppe et qui jette toutefois un regard stoi¨que et philosophique sur le monde. Par cette confrontation nous avons constate´ que ces deux e´critures se fondent sur les deux attitudes e´thiques diffe´rentes et sur les deux esthe´tiques diffe´rentes. Malgre´ leurs diffe´rences bien re´elles, nous avons remarque´ aussi que ces deux e´critures n`en re´ve`lent pas moins les lieux communs bien inte´ressants. La re´volte est a` l`origine de son choix d`e´criture, disons de celui de ses deux e´critures. Nous trouvons e´galement que dans ses deux e´critures, c`est le labyrinthe du coeur humain qu`elles veulent mettre au jour. Et ces deux e´critures sont traverse´es par la jouissance artistique de la simulation et de la ne´gation.
주거환경만족도 평가의 신뢰성 향상을 위한 기초연구 - 주거실태조사의 설문구성 방식을 중심으로 -
박동찬(Park, Dong Chan),최정민(Choi, Jung Min) 한국주거환경학회 2019 주거환경(한국주거환경학회논문집) Vol.17 No.2
This paper aims to investigate the reliability verification of residential satisfaction evaluation in terms of the SP(Same-Pattern) responses suspected as outliers under the 2006-2017 KHS. Based on the research hypothesis developed from the distributional characteristics in the Same-Pattern (SP) responses obtained across 2006-2017 KHS, each of three distinctive questionnaires types (type B, R, and D) are prepared and distributed to 750 respondents (2,250 respondents in total) through online. The key findings are as follows: First, the “Reduced type R”, in which the number of questionnaire items is reduced in an attempt to lower the likelihood of unreliable answers resulting from the fatigue effect, adversely affected the result and presented even greater tendency towards SP responses. It is concluded that such simple measures of reducing the number of questionnaires do not effectively address the problem of SP occurrence that is suspected of being outliers. Second, the “Divided type D”, in which the questionnaire items were divided into multiple sub-groups in an attempt to increase the awareness of respondents and prod them into action, presented the lowest occurrence of SP responses. Moreover, this type is likely to have the lowest possibility of co-existing outliers, the result confirmed by the verification process using statistical and machine-learning analysis. Third, it became clear that reducing the number of questionnaires while simultaneously inserting heterogeneous intermediary questionnaires is the most effective method to conduct the table-formulated satisfaction evaluation utilizing a Likert scale. However, since an excessive partition may cause unnecessary psychological pressure on respondents and increase the likelihood of SP outliers, it is highly recommended to utilize the carefully designed framework for the best result.