• 대한추나의학회지
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• 제6권1호
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• pp.147-156
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• 2005

Objective : The objective of this study is to evaluate the treatment effect of Band training in Osteoporotic Compression Fracture. Methods : Band training, Herb medicine and Acupuncture were performed for 56days admission in a patient who had Osteoporotic Compression Fracture. Result : ROM of Lumbar, Milgram test and Dorsiflexion has improved. VAS and ODI score were also decreased.

• Geomechanics and Engineering
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• 제5권6호
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• pp.499-517
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• 2013

In order to investigate shear behavior of granular materials due to excavation and associated unloading actions, load-controlled plane strain compression tests under decreasing confining pressure were performed under drained conditions and the results were compared with the conventional plane strain compression tests. Four types of granular material consisting of two quartz sands and two glass beads were used to investigate particle shape effects. It is clarified that macro stress-strain behavior is more easily influenced by stress level and stress path in sands than in glass beads. Development of localized deformation was analyzed using photogrammetry method. It was found that shear bands are generated before peak strength and shear band patterns vary during the whole shearing process. Under the same test condition, shear band thickness in the two sands was smaller than that in one type of glass beads even if the materials have almost the same mean particle size. Shear band thickness also decreased with increase of confining pressure regardless of particle shape or size. Local maximum shear strain inside shear band grew approximately linearly with global axial strain from onset of shear band to the end of softening. The growth rate is found related to shear band thickness. The wider shear band, the relatively lower the growth rate. Finally, observed shear band inclination angles were compared with classical Coulomb and Roscoe solutions and different results were found for sands and glass beads.

• 한국통신학회논문지
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• 제22권3호
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• pp.493-505
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• 1997

In this paper, a wavelet image compression method using human visually estimated quantizer is proposed. The quantizer has three components. These are constructed by using effects of frequency band, background luminance, and spatial masking. The first quantization factor is a fixed constant value for each band. The second factor is calculated by averaging four wavelet coefficients in the lowest frequency band. The third factor is determined by the difference between wavelet coefficients in the lowest frequency band. Arithmetic coding is used for encoding quantized wavelet coefficients. Coefficients in the lowest band are transmitted without loss. Therefore the compressed image is decompressed by using three quantization factors which can be calculated in the receiver. Compared with previous image compression methods which adopted human visual system, the proposed method shows improved results with less computational cost.

• 대한방사선기술학회지:방사선기술과학
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• 제38권3호
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• pp.261-266
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• 2015

요로결석으로 인한 경정맥 요로조영 검사는 방사선 비 투과성 물질인 요오드 조영제를 사용하여 요관의 경로에 있는 결석을 진단하는 방사선학적 검사법이다. 그 검사 방법 중 엉덩뼈 능선 상단에 대한 압박으로, 조영제가 방광으로 배출되는 것을 막아, 상부요로의 묘출을 용이하게 하는 압박대 사용 유무는 병원마다 다른 방법을 적용하고 있다. 연구자들은 실험을 통하여 압박 과 압박을 하지 않은 상태에서 조영제 진행의 특이도를 관찰하여 상호 비교하고자 하였다. 본 연구는 조영제의 종류, 용량, 검사진행 기준이 동일한 일 병원에서 실시한 경정맥 요로조영 검사 60 례를 후향적 영상평가 방법으로 실시하였다. 영상평가는 5 분 영상으로 제한하여 압박 유무에 대한 조영제의 해부학적 주행 위치가 용이한 시간대로 하였으며, 콩팥 피라미드에서 콩팥깔때기까지를 "RP", 콩팥깔때기에서 요추 3 번째 종판까지를 "PL", 양쪽 엉덩뼈 능선을 기준으로 상부와 하부를 "IU"와 "IL"으로 해부학적 영역을 설정하였다. 분석방법은 피셔의 정확 검정에 의한 통계적 방법으로 압박과 압박을 하지 않은 상태에서 해부학적 위치의 분포차이가 있는지를 분석하였다. 압박그룹과 압박을 하지 않은 그룹 각 30 례의 영상평가에서 P 값이 왼쪽 0.580, 오른쪽 0.711, 양쪽에서 0.960 등으로 나타나 통계적으로 유의한 분포의 차이가 없음을 확인하였다. 이로서 요로결석 환자의 경 정맥 요로조영 검사 시 압박 대 사용유무는 조영제 진행에 차이를 주지 않는다는 통계적 결론을 얻었다.

• 한국의류학회지
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• 제44권1호
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• pp.1-12
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• 2020

It is essential to apply compression bands or pressure garments that can stabilize the breast implants and breast shape as well as help shape the breast to the desired shape immediately after breast augmentation surgery. It is necessary to study the compression garment which is able to properly cover a deformed breast due to the operation and shape it as a beautiful breast. The subjects of the study were 6 women who experienced breast augmentation surgery with an under bust size of 70 or 75, cup size of C cup with a hemispherical and conical shape. We analyzed the dissatisfaction and satisfaction factors through the evaluation of the 4 types of commercial compression garments and developed the new functional post-operative bra which can be worn immediately after the operation according to the breast characteristics of breast augmentation patients. We have developed new bra patterns; a front opening type garment with wings and a band type garment both sides that allow the band to be pressed from the front center. The comparative wearing evaluation indicated that the superiority of the new compression garments also provided a higher the satisfaction of the newly developed bra (front adjustable style) than a commercial band.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권8호
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• pp.3295-3311
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• 2020

With the wide application of hyperspectral images, it becomes more and more important to compress hyperspectral images. Conventional recursive least squares (CRLS) algorithm has great potentiality in lossless compression for hyperspectral images. The prediction accuracy of CRLS is closely related to the correlations between the reference bands and the current band, and the similarity between pixels in prediction context. According to this characteristic, we present an improved CRLS with adaptive band selection and adaptive predictor selection (CRLS-ABS-APS). Firstly, a spectral vector correlation coefficient-based k-means clustering algorithm is employed to generate clustering map. Afterwards, an adaptive band selection strategy based on inter-spectral correlation coefficient is adopted to select the reference bands for each band. Then, an adaptive predictor selection strategy based on clustering map is adopted to select the optimal CRLS predictor for each pixel. In addition, a double snake scan mode is used to further improve the similarity of prediction context, and a recursive average estimation method is used to accelerate the local average calculation. Finally, the prediction residuals are entropy encoded by arithmetic encoder. Experiments on the Airborne Visible Infrared Imaging Spectrometer (AVIRIS) 2006 data set show that the CRLS-ABS-APS achieves average bit rates of 3.28 bpp, 5.55 bpp and 2.39 bpp on the three subsets, respectively. The results indicate that the CRLS-ABS-APS effectively improves the compression effect with lower computation complexity, and outperforms to the current state-of-the-art methods.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.673-676
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• 1998

Future land remote sensing satellite systems will kikely be constrained in terms of communication band-width. To alleviate this limitation, the data must be compressed. Image data obtained from satellite exhibit a high degree of spatial and spectral correlations that must be properly exploited. In this paper we propose multispectral image data compression using wavelet transform and selective predicted vector quantization. Th eproposed method is based on accuratly predicting other band from reference band and reducing bit rate through threshold map. we can achieve better compression effeciency than conventional methods.

• 한국자동차공학회논문집
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• 제7권8호
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• pp.132-142
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• 1999

In this paper, a new formula for primary and secondary thrust of metal belt CVT is proposed considering variation of band tension, block compression and active arc for each of the primary and secondary pulleys. For the secondary thrust, effective friction coefficient is introduced considering the effect of flange deflection. Nondimensional primary and secondary thrust of the metal belt CVT by the new formula agree well with the experimental results except for low torque range, $0\;<\;{\lambda}\;<\;0.2$ at speed ration i = 1.0. The new formula can be used in design of the primary and secondary thrusts control system for the metal belt CVT.

• 융합신호처리학회논문지
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• 제7권2호
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• pp.65-72
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• 2006

디지털신호처리에 있어서 신호의 다상분해(polyphase decomposition)는 멀티레이트(multirate) 시스템 구현에 있어서 다양한 용도로 사용된다. 특히 디지털 필터설계 등에 있어서 다채널 신호를 제공함으로써 병열연산을 가능하게 하여 알고리즘의 성능을 개선하는데 특히 유용하다. 일반적으로 다상분해신호는 원신호를 다운샘플링을 위해 데시메이션(decimation)하기 때문에 원신호에 비해 많은 고주파 성분을 포함하여 주파수 대역이 확장되는 경향이 있다. 이러한 성질은 다상분해신호의 활용, 즉 디지털 신호처리 시스템의 구조나 성능에 상당한 제약을 초래한다. 따라서 본 연구에서는 다상분해신호에 대한 완전 대역압축 및 복원 방법을 이론적으로 제시하고 Matlab 시뮬레이션을 통하여 그 유효성을 확인한다.

• 대한전자공학회논문지TC
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• 제46권12호
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• pp.22-29
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• 2009

본 논문에서는 X-대역 펄스압축 반도체형 레이다를 위한 200W SSPA를 개발하였다. 개발한 X-대역 SSPA는 전치증폭단, 구동증폭단, 고출력을 위한 주전력 증폭단의 3단 연계구조형 증폭기로 구성되어있다. X-대역에서 200W 이상의 출력을 내기 위해 주전력 증폭단은 충분한 이득과 전력을 얻을 수 있는 GaN HEMT소자를 사용하여 병렬구조로 설계하였다. 개발한 SSPA는 주파수범위 9.2-9.6GHz, 펄스주기 1ms, 펄스폭 100us, 듀티사이클 10% 조건에서 전체이득 59dB 이상, 출력전력 200W이상의 성능을 가진다. 본 논문에서 개발한 SSPA는 펄스압축기술을 이용한 고품위 반도체 레이다시스템에 적용할 수 있다.