• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권12호
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• pp.4872-4891
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• 2015

Orthogonal frequency division multiplexing (OFDM) signals suffer from the problem of high peak-to-average power ratio (PAPR), which complicates the design of analog front-end of the system. Companding is a well-known PAPR reduction technique that involves transforming signal amplitudes using a deterministic function. OFDM signal amplitude, on average, is Rayleigh distributed but the distribution can vary significantly from symbol to symbol, especially when constellation size increases. In this paper, a new adaptive companding scheme is proposed along with its design methodology aiming at optimizing the compander performance by accommodating this variation in its design. This is achieved by designing compander parameters separately for statistically dissimilar symbols in OFDM waveform and making the compander select from these parameters, during run-time, according to the features of input symbols.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.899-902
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• 1999

In this paper, we designed a equalizer that moved the multipath of channel in 8-VSB transmission receiver. After doing the initial equalization with "LMS(Least Mean Square)"aigorithm. this equalizer used "Stop-and-Go" algorithm. Because of estimating SER(Symbol to Error Ratio) every a training sequence, this can positively cope with transformation of channel and because of using fast clock than symbol-clock(10.76 MHz), we are able to reduce a multiplier.

• 한국의류학회지
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• 제33권8호
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• pp.1241-1252
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• 2009

This study is on the internal and external characteristics along with the phenomena of dress and ornaments expressed in them by analyzing Re-orienting Fashion (which is a system of signs and symbols) based on the theories of semiology in the search for the Korean identity by examining a Re-orienting Fashion that is being reinterpreted. Re-orienting Fashion performs the role of signs that act in the spread of Oriental culture through the globalization of traditional dress and ornaments in the Orient. It also has a meaning that converts the world of fashion to a new direction. When analyzing the system of signs and symbols in Re-orienting Fashion (based on the theories of semiology) the conclusions are that an eclectic symbol system has been formed by the combination of the pursuit of modernization in traditional dress and ornaments with post-modernism. A nature-friendly symbol system has been shaped as a natural silhouette in terms of the combination with Eastern philosophy that searches for a harmony with nature according to ecological trends. The ideal of a symbol system means the introduction of design elements in traditional dress and ornaments of the East as a rejection of Western civilization and as an alternative to the fixed pattern of the West.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2007년도 춘계학술대회 논문집
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• pp.270-274
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• 2007

Clearing trace of symbol which was gone with a series of pre-modern architecture history since the modern architecture (pursuing true nature from tradition which is repeated and imitated unconsciously). That is, What is the course of deconstruction? In the early part of the 20th century, We still accept the necessity of decoration in spite of its existence at one time being threaten. This means, even though symbolism in architecture has relative importance by situation of Times, it plays an important role to add the past to current style through 'Symbol'. The history of Times, a carrier which reflects Present on New Futures, makes memory by gathering data but we can not amplify our historical imagination with only data. Data is a past memory and evidence but we can not substitute that for historical experience. And it is difficult for future generations who don't live through that history to change their historical recognition with recollecting memories. They have to draw history with data but it is very limited in itself. However, They can collect historical memory through symbol in architecture. In this study, We pay attention to the symbolism of a memorial hall architecture. So We'll analyze dichotomy concept of Barthes's signifiant and signifie, visual sign and course of symbolic meaning on basis of Daniel Libeskind's Jewish Museum.

• ETRI Journal
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• 제31권6호
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• pp.795-802
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• 2009

This paper presents the design of an advanced terrestrial digital multimedia broadcasting (AT-DMB) baseband receiver SoC. The AT-DMB baseband is incorporated into a hierarchical modulation scheme consisting of high priority (HP) and low priority (LP) stream decoders. The advantages of the hierarchical modulation scheme are backward compatibility and an enhanced data rate. The structure of the HP stream is the same as that of the conventional T-DMB system; therefore, a conventional T-DMB service is possible by decoding multimedia data in an HP stream. An enhanced data rate can be achieved by using both HP and LP streams. In this paper, we also discuss a time deinterleaver that can deinterleave data for a time duration of 384 ms or 768 ms. The interleaving time duration is chosen using the LP symbol mapping scheme. Furthermore, instead of a Viterbi decoder, a turbo decoder is adopted as an inner error correction system to mitigate the performance degradation due to a smaller symbol distance in a hierarchically modulated LP symbol. The AT-DMB baseband receiver SoC is fabricated using 0.13 ${\mu}m$ technology and shows successful operation with a 50 mW power dissipation.

• 한국통신학회논문지
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• 제28권4B호
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• pp.237-244
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• 2003

본 논문에서는 QPSK/16-QAM 방식의 LMDS(Local Multipoint Distribution Services) 용 downstream 수신기 칩 설계에 대해서 기술한다. 제안된 칩은 블라인드 등화기, 심볼 타이밍 복구회로, 반송파 복구회로로 구성된다. 블라인드 등화기는 CMA(Constant Module Algorithm)를 이용한 DFE(Decision Feedback Equalizer) 구조로 사용했다. 심볼 타이밍 복구회로는 Parabolic Interpolator를 이용하였고 반송파 복구회로는 Decision Directed Basis 방식을 이용하여 반송파의 주파수 옵셋, 위상 옵셋, 위상지터(Jitter)를 제거하였다. 구현된 수신기는 10, 20, 30 그리고 40 Mbps 의 4가지 데이터 전송률을 지원할 수 있고 심볼 전송률은 10 Mbaud까지 지원할 수 있으며 기존의QAM 수신기보다 빠른 구조이다.

• 문화기술의 융합
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• 제4권2호
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• pp.191-196
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• 2018

최근 소비자의 취향이 다양해지고 소비패턴이 변화하며 상품 포장디자인이 점차 발전한다는 것을 체감할 수 있다. 상품 포장디자인은 내용물을 정확하게 알 수 있게 만들어져야 하고 소비자의 눈길을 끌어 상품을 구매하고 싶도록 만드는 매력을 가지고 있어야 한다. 또한 상품디자인은 소비자들에게 시각적 효과를 유도한 그래픽 요소와 더불어 브랜드 네이밍, 패키지 레이아웃, 내용물 표현방법, 맛을 상상할 수 있는 색감 등에 따라 구매의욕을 일으켜야 한다. 상품의 포장디자인에서 내용물에 대한 이미지를 한 눈에 알 수 있게 표현한 그래픽 요소는 상품의 부가가치를 높이고 소비자의 구매동기 유발이나 유통의 합리화를 이루는 가장 핵심적인 요소라 할 수 있다. 본 연구는 축산상품에서 시각정보 메타데이터를 이용한 시각정보 심벌 이미지에 대한 연구이며 다양한 축산 포장에 대한 사례를 살펴보고 메타데이터 요소로 축산 이미지를 한 눈에 알 수 있게 표현한 그래픽 요소를 제시하여 축산상품에 활용하고자 한다. 축산 상품의 프리미엄화를 추구하고, 브랜드 가치를 높이며 차별화된 디자인 전략으로 경제적 효과와 더불어 축산 시장 활성화를 위한 가능성을 제시하고자 한다.

• Journal of Communications and Networks
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• 제7권3호
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• pp.248-257
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• 2005

In this paper, we develop design procedures for carrier tracking loop for orthogonal frequency division multiplexing (OFDM) systems or other systems of blocked data. In such communication systems, phase error measurements are made infrequent enough to invalidate the traditional loop design methodology which is based on analog loop design. We analyze the degradation in the OFDM schemes caused by the tracking loop and show how the performance is dependent on the rms phase error, where we distinguished between the effect of the variance in the average phase over the symbol and the effect of the phase change over the symbol. We derive the optimal tracking loop including optional delay in the loop caused by processing time. Our solution is general and includes arbitrary phase noise apd additive noise spectrums. In order to guarantee a well behaved solution, we have to check the design against margin constraints subject to uncertainties. In case the optimal loop does not meet the required margin constraints subjected to uncertainties, it is shown how to apply a method taken from control theory to find a controller. Alternatively, if we restrict the solution to first or second order loops, we give a simple loop design procedure which may be sufficient in many cases. Extensions of the method are shown for using both pilot symbols and data symbols in the OFDM receiver for phase tracking. We compare our results to other methods commonly used in OFDM receivers and we show that a large improvement can be gained.

• 한국의상디자인학회지
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• 제16권4호
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• pp.189-203
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• 2014

In this study, Creative motifs using face composition of Jogakbo and Knot Symbol were developed, and applied to traditional Baeja of Joseon Dynasty to develop design contents of traditional clothes. As for study method, 7 motifs of new formative image that integrates traditional beauty and contemporary sense were developed by applying Knot Symbols and face compositions of Jogakbo with the use of Adobe Illustrator CS6 and Adobe Photoshop CS6 vector graphic software. The motifs were designed in contemporary image in face compositions like rectangle pattern, triangle pattern, dual rectangle pattern, vertical and horizontal pattern, pinwheel pattern, gojunmun pattern and free pattern by involving various changes like repetition, rotation, reduction, expansion and decomposition and using the colors used in the Jogakbo. It is desired that through this study, traditional Baeja may develop to bear traditional and contemporary image so that our traditional clothes design may become global. Also it is anticipated that this study will contribute to development of culture products of Hanbok like Jeogori, pants and skirt that require change of design in the global era while maintaining traditional beauty to appeal to the emotions of world citizens.

• 한국복식학회:학술대회논문집
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• 한국복식학회 2004년도 International Costume Conference in Association with ICOM 2004 SEOUL
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• pp.64-65
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• 2004