• ETRI Journal
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• 제34권4호
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• pp.617-620
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• 2012

The denoising mapping with the closest-neighbor clustering (CNC) method in denoise-and-forward two-way relay channels is studied. Specifically, the symmetry of the constellations in source terminals A and B is utilized to reduce the complexity of the CNC method. The specific case considered first to illustrate how the constellation symmetry works in the CNC method is the quadrature phase-shift keying constellation in A and B and the single-antenna deployment in all terminals. This case study shows that an enormous complexity reduction can be achieved. Next, the result is extended to multiple-antenna scenarios and square quadrature amplitude modulations.

• 한국통신학회논문지
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• 제19권4호
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• pp.669-678
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• 1994

본 논문에서는 QAM 신호를 전송하는 디지털 통신 시스템에서 고출력 증폭기(HPA)의 비선형성을 보상하기 위한 메모리 있는 데이터 사전왜곡 방법을 제안한다. 메모리 없는 HPA의 비선형성을 줄이기 위해 구현된 종래의 데이터 사전왜곡 방법에 비해, 본 논문에서 제안된 방법은 신호 성상도의 비선형 왜곡(warping)을 줄여 줄 뿐만 아니라 메모리 있는 전송 펄스 형성 필터로 인해 일어나는 심볼의 군집(cluster)을 원래의 심볼로 보상한다. 본 논문에서는 사전왜곡단의 메모리 크기를 줄이기 위해 QAM 신호 성상도의 대칭성을 고려하여 modulo-4 연산을 이용한다.

• 복식
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• 제66권8호
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• pp.78-97
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• 2016

The purpose of this study is to develop textile pattern designs by utilizing the prototype of traditional culture extracted from cultural resources in order to establish a specialty strategy for local cultural contents. To achieve this, the study selected the Hyojaemunjado as source of Jeju traditional culture. Jeju's Hyojaemunjado is characterized mainly by the creative and unique formativeness of Jeju's character paintings. Character paintings often contained images related to the characters featured inside characters, or composed stroke with symbolic iconography. The main subjects of Hyojaemunjado were stories that alluded to the Confucian virtues. Therefore, the purpose of this study was to remind people of the real meaning of Shin(truth) by developing textile pattern designs, which borrows the tessellation technique for design, and the dominant characteristic of geometric abstraction. This study used theoretical research and empirical analysis. First, the study did the theatrical research on Hyojaemunjado based on literature and precedent studies, and then analyzed the style of expression and formativeness on the Shin character paintings through real analysis of Jeju's Hyojaemunjado kept in Jeju National University Museum. Second, based on the analysis of the style(three-tier composition) and formativeness of Hyojaemunjado, it analyzed the formativeness of the iconography about Shin, i.e. character types(semi cursive style, square style) drawn according to the symbolic meaning, palace, unknown flower, pheasant, tile fish and constellation. Based on analysis of the iconography, it stylized the motives that became available on the Archimedean tiling of tessellation, and then developed the textile pattern designs by arranging the iconographic motives with Platonic tiling and Semi-tiling. The reason why this study borrowed tessellation was to create various visual effects using the size of angle, symmetry and change and joint with simple figure.