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다중 직교 특성을 갖는 FH-MFSK 방식의 수중음향통신
이형우,김기만,손윤준,김우식,천승용,이상국,Lee, Hyeung-Woo,Kim, Ki-Man,Son, Yun-Joon,Kim, Woo-Sik,Chun, Seung-Yong,Lee, Sang-Kook 한국음향학회 2014 韓國音響學會誌 Vol.33 No.6
In this paper, we propose an underwater acoustic communication of FH-MFSK(Frequency-Hopped Multiple Frequency Shift Keying) system with multiple orthogonal property. Generally, the processing of FSK(Frequency Shift Keying) method is simple, but it is vulnerable to ISI (Inter-Symbol Interference) caused by multipath transmission. In this paper, the orthogonal codes are generated with the same number of transmitting symbols, and these codes are corresponding to multiple frequencies. We used m-sequence to generate multiple orthogonal codes. We compared the performance of proposed method with conventional MFSK method via the experiment. As a result, we confirmed that the proposed method shows 6~10 % lower error rate at 100 bps than conventional method. 본 논문에서는 다중 직교 특성을 갖는 FH-MFSK(Frequency-Hopped Multiple Frequency Shift Keying) 방식의 수중음향통신을 제안한다. 일반적으로 FSK(Frequency Shift Keying) 방식은 처리 과정이 단순하지만 다중 경로 전달로 인해 발생하는 인접 심볼간 간섭에 취약하다. 본 논문에서는 전송하고자 하는 심볼 수와 동일한 서로 직교 성질을 갖는 코드들을 생성한다. 이 코드 값들은 각각 다수의 주파수들에 대응된다. 이러한 다중 직교 코드를 생성하기 위해 m-sequence를 이용하였다. 실험을 통해 제안된 방법의 성능을 기존의 MFSK 방식과 비교하였다. 100 bps 전송율에서 제안한 방법은 기존의 방법보다 오차율이 6 ~ 10 % 낮게 나타났다.
이형우 ( Hyeong Woo Lee ) 한국언어문화학회 2010 한국언어문화 Vol.0 No.41
The aim of this study is to reveal the meaning of space, which appears in kisaeng shijos, through constitutional poetry. Kisaeng shijos are deserved to perfectly fit for the constitutional study, for they are the very materials that the poets with the similar social standing and circumstances show the same emotional appeals and the different ways to express them as well. We can consider that how their literatural constitutions unveil and how they take similar figures through this. But it also results from space that the emotions, which are alike and different, or vice versa, take place at the same time. Space shares memory, and memory shares emotions. Macro-space looks all alike, but micro-space is all different. The remarks which reveal according to the micro-spacial are different even under the same heaven in the same era. Right here is the point of contact between constitution and space. Constitutional poetry shows that literature is part of remarks on constitutions and finds how it works in `Dong-ui-su-se-bo-won`《東醫壽世保元》by Chema Lee. `Dong-ui-su-se-bo-won` devides space into inside and outside. The space inside is in the body, and the space outside is in out of the body. The body watches right side and left side, proceeding forward or backward. The front and back of the body means time, and the right and left sides of the body means space. Space in the body is named as right and left sides, with the mind that watches throughout the body. On the other hand, the right side and left side point out the individual and social space meaning knowledge and conduct and a salary. Knowledge and conduct is a will-related space with a possibility of achieving with a mind to do, but salary is a non-related space with a individual will because it only has relation to honour and property. Human beings come and go between these two spaces, and constitutions take a role to suggest the ranges of directedness and variableness. Space out of the body forms the hierarchial classes. It constitutes the first dimension, the locality; the second dimension, ethics; the third dimension, society; and the fourth dimension, help from Heaven. Locality means individual and ecological circumstances; ethics means groups or clubs; society means the world; and help from Heaven means universal space. Constitutions are apt to favor the space. Space in the body looks for something between will and relation, but space out of the body looks for something in likes and dislikes. In conclusion, the lives and literature of human beings are ways to react against space, and a weaving point that reveals how they construct space in constitutional ways. Kisaeng shijos must be considered as the very materials to look into. So we are to understand the texts and the whole situations according to `Dong-ui-su-se-bo-won,` find the similarity and difference between the texts, and where constitutionally maximized artistic values are.