• 대한디지털의료영상학회논문지
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• 제9권2호
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• pp.11-16
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• 2007

We have evaluated and compared of gradient echo and spin echo EPI for compensating about deeply distortion aspect in case of post-operation patients in magnetic resonance image. A total of 100 patients were performed on 3.0 T(GE Signa Excite E2, USA) with 8ch head coil. As a result of analysis, The SNRs of whiter and gray matter areas were 36.74 $\pm$ 06 and 39.96 $\pm$ 09 in the gradient echo EPI, the SNRs which white and gray matter areas were slightly higher than gradient echo EPI(P<0.005, paired student t-test). It was 46.24 $\pm$ 11 and 51.38 $\pm$ 13 in gradient and spin echo EPI, respectively. The signal intensity in the whiter and gray matter areas also were 87.33 $\pm$ 15.24 and 140.66 $\pm$ 13.45 in the gradient echo EPI techniques, The signal intensity of gradient echo EPI showed higher values compared to spin echo EPI. Otherwise, gradient echo EPI technique is distortion enough to operation wound and edge of the image, while spin echo EPI technique did not appear almost. In this point, the spin echo EPI technique, after surgical operation according to patient state beside gradient echo EPI techniques that signalbeside gradient echo EPI techniques that signal intensity is high and patient's case which image distortion is serious by metal etc, will be provide the useful information in adults and pediatric patients.

• 한국방사선학회논문지
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• 제15권3호
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• pp.321-327
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• 2021

Wrist PA-grip view는 주변 인대들의 손상을 쉽게 진단할 수 있기 때문에 삼각섬유연골 파열 진단에 시행한다. 그러나 의료장비 기술의 발전에도 불구하고 기하학적 요소에 따른 영상의 왜곡은 아직까지도 많은 제한점이 있다. 본 논문에서는 정확한 Wrist PA-grip view 검사를 위해 현재 사용되고 있는 검사방법에서 발생되는 왜곡을 분석하여 영상의 왜곡을 최소한으로 감소시킬 수 있는 검사방법을 제시하고자 한다. Wrist PA-grip view를 재현하기 위하여 인체모형 팬텀을 사용하였고 source of image distance (SID)는 110 cm와 임의로 정해놓은 130 cm, 150 cm로 설정하였다. 각 SID에 따라서 손목 팬텀을 x축 방향 및 y축 방향으로 각각 0, 2, 4, 6, 8, 10 cm 이동하였다. 정량적 평가를 하기 위해 손목 팬텀의 이동 시 마다 자뼈와 노뼈의 먼쪽관절면의 거리의 차이를 picture archiving and communication system (PACS) system을 통해 측정하였다. 정성적 평가로는 방사선사 20명을 대상으로 설문조사를 실시하였다. SID에 따라 나뉜 세 그룹 간의 x축과 y축 방향의 움직임에 따른 왜곡도를 비교하기 위해 Kruskal Wallis test 통계기법을 시행하였으며 사후검정으로 Tukey test를 시행하였다. 정량적 평가 결과에서 x축 방향으로 이동하여 얻은 측정값은 모든 그룹에서 유의한 차이를 보이지 않았다 (p>0.05). y축 방향으로 이동하여 얻은 측정값은 대부분의 그룹에서 유의한 차이를 보였다 (p<0.05). 영상에서 왜곡이 임상적 진단과 수술에 많은 영향을 미치는 검사의 경우, 보다 정확한 진단을 위해 영상 후처리로 영상의 질을 유지하는 한도 내에서 기존의 SID인 110 cm 보다는 150 cm에서 검사하여 왜곡을 감소시키기를 제안하는 바이다.

• 한국산학기술학회논문지
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• 제15권7호
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• pp.4380-4386
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• 2014

본 연구는 갑상선의 확산강조영상 검사 시 조직과 공기 간 자화율차이를 줄임으로서 영상의 뒤틀림을 감소시키고자 하였다. 연구대상은 정상인 23명을 대상으로 하였으며, 공기와 인접해 있고 주변에 후두와 기관이 자리 잡고 있어 뒤틀림이 많이 발생하는 갑상선을 대상으로, 실리콘 적용 전 후 확산강조영상의 뒤틀림과 오차율을 비교평가 하였다. 연구결과 실리콘 적용 전보다 적용 후가 뒤틀림이 감소된 것을 볼 수 있으며, 오차율 또한 30%대에서 10%대로 감소하는 것을 볼 수 있었다. 또한 일원배치분산분석과 Duncan의 사후분석을 통해서도 실리콘 적용 후가 기준영상인 T2 강조영상의 면적과 차이가 없음을 알 수 있었다. 결론적으로 본 연구는 선행연구들의 복잡한 과정 없이 자기공명신호의 대조도에 영향을 주지 않으면서 공기와 맞닿은 굴곡진 부분을 보상함으로써 영상의 뒤틀림을 감소시킬 수 있는 근본적인 개선 방안을 제시하였다는 데에 커다란 의의가 있다.

• 복식
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• 제65권6호
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• pp.99-111
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• 2015

The purpose of this study is to identify the expression methods of uncanny images shown in contemporary fashion through the visual expression methods of plastic arts. The study results are as following. First, there is a concept-forming element of 'The return of Repressed', which is a psychological mechanism for generating uncanny sets to the component of 'repression' and 'return'. 'Repression' herein consisted of 'unconsciousness', 'the other', and 'anxiety', while the return was composed of 'trauma' and 'repetition compulsion'. Second, there are visual expression methods of the uncanny in contemporary art. The subject of 'repressed things' was expressed as grotesque and having a terrible look. 'Fragmented body' was analyzed as 'dismantling' by mutilation, 'combination' placing cut body parts in other places, and 'damage' suffering from an illness or accident. 'Fear of death' was shown as 'anatomy' reminiscent of death and 'iconography of death' meaning return of the dead. 'Post-human' was a surrealistic being such as a monster and mechanized human, and was analyzed as 'gene variation' and 'cyborg'. Third, the methods of visual expression of the uncanny reflected on contemporary fashion was analyzed as 'fragmented body', 'fear of death', and 'post-human'. 'Fragmented body' appeared as the object reminiscent of the fragmented body, 'dismantling and combination of the body', and 'damage of the body' through the distortion of the clothing construction principle. 'Fear of death' visualized the characteristic elements of the subject reminiscent of death as 'iconography of death' and 'symbolic object of death' through the motif. 'Post-human' was the description of the subject beyond the body's function and form, and was shown as 'gene variation' and 'cyborg'.

• 한국컴퓨터산업학회논문지
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• 제5권7호
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• pp.737-746
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• 2004

본 논문에서는 영상 데이터 압축을 위하여 2- 채널 멀티웨이브렛 변환을 적용하였다. 멀티웨이브렛 시스템은 음성 데이터 등의 비정상적인 신호의 압축에 스칼라 웨이브렛 시스템을 능가하는 우수한 성능을 나타내는 것으로 알려져 있으나 2차원 데이터인 영상 데이터의 경우에는 멀티웨이브렛 시스템 특유의 시각적 격자 오류가 발생하는 문제가 있다. 본문의 멀티웨이브렛 변환 및 압축 시스템에서는 멀티웨이브렛 효과에 의하여 발생하는 격자 오류를 제거하기 위하여 전후처리 필터링을 멀티웨이브렛 변환 및 압축 시스템에 접목하는 방법을 제시하였다. 또한, 제안한 시스템의 성능을 검증하기 위하여 컴퓨터 시뮬레이션을 수행하였으며 영상 데이터의 압축 기능 측면에서 스칼라 웨이브렛 시스템과 비교하였다. 이때, 비트 할당과 양자화를 위해서 전송율 결과는 제안한 멀티웨이브렛 변화 및 압축 시스템이 스칼라 웨이브렛 시스템 보다 영상 압축 성능 측면에서 1 ~ 2 dB 우수한 것으로 나타났다. 만약 SPIHT과 run-length 채널 부호화 기법 등의 우수한 압축 기술을 멀티웨이브렛 변환 시스템에 적용한다면 더욱 우수한 성능 개선 효과를 기대할 수 있을 것으로 사료된다.

• International Journal of Costume and Fashion
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• 제5권2호
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• pp.68-77
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• 2005

In contemporary advertising market, one of main trends is to speak surrealistic visual language which provides 'enjoyable spectacles'. Specially, in the beginning of 21st century, there discovered more and more exhibitions and discourses about surrealism reinterpreted from the viewpoint of postmodernism. Surrealism as a creative style of expression based upon free association, has been a great inspiration for fashion ads for commercial communication as well as fashion design since its origin. However, there has been ignored the idea of analyzing surrealistic image expressed in fashion ads in spite of their flood. Accordingly, the purpose of this study is to grasp its cultural meaning through analyzing aesthetic characteristics of surrealistic image expressed in fashion ads. It will provide a better understanding of surrealistic image in fashion ads reflecting popular taste and preference directly as popular visual culture, focusing on post modern context. A case study of surrealistic fashion ads limits to TV or print commercials and digital ads as image ads stimulating visual expressions. The Results can be summarized as follows. Surrealism is an avant garde style which deconstructs the established meaning system as well as the existing formalistic order and then put them together in the frame of 'dream' and 'unconsciousness'. Defamiliarization questioning the whole edifice of representation can be adapted to. By means of paradox and metaphor, unfamiliar new visual world can be represented. The plastic characteristics of surrealistic image in fashion ads are founded as surrealistic styling of time and space, distortion of object by methods of automatism, depaysement, parody and trompe-l'oeil which bring about the deconstruction of gestalt. Aesthetic values of surrealistic fashion ads appear as dualistic representation, allegoric symbolism, fantastic romanticism. Ultimately they lead to marvelous. mysterious, humorous visual effects. Foster reinterpreted these effects of surrealism from Freud's 'Uncanny Concept'. 'Uncanny' means the phenomenon recurring to familiar being defamiliarized by repression. Surrealistic fashion ads strengthen this shocking effect more and more dramatically in company with our post modern needs for fantastic adventure and thrilling spectacle. It can be thought that surrealistic fashion ads reflects uncanny as an alternative which can relieve us of our stress and anxiety and which realize our potential desire in contemporary post industrial stage.

• 복식
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• 제55권7호
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• pp.38-50
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• 2005

The purpose of this study is first, to see through the aesthetic essence of the clothing as art, through theoretical consideration of cultural feature and body style in Postmodern Feminism. Also, this study will examine the aesthetic value in artistic meaning regarding a Deformational body image in visual an. Second, this study will analysis the formative character of Modern Art to wear which expressed unfixed body style, followed by the change of Postmodern Feminity, as a Deformation image. This character will be categorized by Expansion, Grotesque, Pleasure, and Virtuality. The following is the result of this study. Expansion expressed in modern Art to wear created intentional structure of the form, and intentionally presented refusal of body existence through disembodied. Grotesque expressed refusal and deviation of women's ideal body style, which is defined by mannish discourse, very grotesquely. Pleasure pleasantly presented free emotion through an intentional transformation like distortion or imbalance of the body By paradoxically reproducing women's virtual body as other unfixed female identity was expressed visually through virtuality to embody post-gender.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2005년도 제31회 KOSCO SYMPOSIUM 논문집
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• pp.78-84
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• 2005

The development of eco-friendly low pressure carburizing system with high pressure gas quenching (LPC_GQ, 500kg/charge) led to new stage in the fundamental case-hardening treatments. This is due to its ability to provide tighter tolerances on the carburizing process with notable reductions in distortion of the carburized and hardened workpiece. This system is characteristics by high uniformity and reproducibility of heat treatment results, absence of an intergranular oxidation layer, carburizing of complex shapes, reduced cycle time, low operating costs, simplified production, eliminate post washing, and reduced grinding costs.

• 열처리공학회지
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• 제19권5호
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• pp.262-269
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• 2006

The development of eco-friendly low pressure carburizing system with high pressure gas quenching(LPC-GQ, 500kg/charge) led to new stage in the fundamental case-hardening treatments. This is due to its ability to provide tighter tolerances on the carburizing process with notable reductions in distortion of the carburized and hardened workpiece. This system is characteristics by high uniformity and reproducibility of heat treatment results, absence of an intergranular oxidation layer, carburizing of complex shapes, reduced cycle time, low operating costs, simplified production, eliminate post washing, and reduced grinding costs.

• 반도체디스플레이기술학회지
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• 제8권1호
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• pp.19-25
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• 2009

Abstract JPEG2000 achieve quality scalability through the rate control method used in the encoding process, which embeds quality layers to the code-stream. This architecture might raise two drawbacks. First, when the coding process finishes, the number and bit-rates of quality layers are fixed, causing a lack of quality scalability to code-stream encoded with a single or few quality layers. Second, in Post compression rate distortion (PCRD) the bit streams after the truncation points discarded. Therefore, computational power for the discarded bit streams is wasted. For solving of problem, through bit rate control, there are many researches. Each proposed algorithms have specially target feature that is improved performance like reducing computational power. Research results have strength and weakness. For the mean time, research contents are reviewed and compared, so we proposed research direction in the future.