• 만화애니메이션 연구
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• 통권14호
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• pp.37-51
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• 2008

애니메이션 작업에 있어 컴퓨터는 꼭 필요한 도구가 되었다. 그러나 컴퓨터와 그에 따른 소프트웨어들의 특성을 잘 파악하지 못할 경우 노력에 상응하는 결과물을 만들지 못할 수도 있다. 이미지 포맷의 부정확한 이해에서 이러한 경우가 발생하기도 한다. 대다수 작업자들은 제작공정 속에서 이미지 포맷을 습관적으로 선택하는 경우가 많으나, 이미지 포맷은 분명한 기능적 차이를 가지고 있으며 그 효율적 사용법도 다르다. 그러므로 보다 효율적인 작업을 위해 애니메이션 작업에 주로 사용되는 여러 종류의 이미지 포맷들을 특성을 파악하는 것이 필요하다. 먼저 오늘날 통신, 데이터저장 등 컴퓨터 전반에서 널리 쓰이는 데이터 압축의 두 종류인 손실 압축과 비손실 압축의 원리와 이미지표현의 서로 다른 구조인 비트맵 방식과 벡터 방식의 차이점, 24비트 트루 컬러와 8피트 알파채빌 등을 살펴보았다. 이러한 특성들을 토대로 2D, 3D, 합성, 편집 등 여러 형태의 애니메이션 작업 간에 사용되는 이미지 포맷들의 기능적 차이점과 그에 따른 장단점을 분석하였으며 실험을 통하여 JPG 파일이 컴퓨터 작업 중에 적은 용량을 차지할 것이라는 생각이 잘못된 것임을 증명하였다. 결론적으로 용량, 기능, 화질을 고려할 때, 편집, 합성, 3D, 2D를 막론하고 가장 효율적인 포맷으로는 TIF 포맷을 제안하며 학교 교육에서는 어도비사의 교육용 프로그램을 많이 사용하므로 호환성과 기능이 우수한 PSD 포맷을 제안하였다. 본 논문이 학교 교육에서나 실무 작업에서 이미지 포맷을 선택함에 있어 기준이 되기를 기대한다.

• 패션비즈니스
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• 제26권4호
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• pp.112-122
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• 2022

The purpose of this study is to investigate the effect of using socks combined with EMS on ankle pain reduction and ankle function improvement in home training participants. In this study, the conductive fabric was combined using socks that can properly compress the ankle. First, VAS was measured during EMS training after fatigue was induced and compared with fatigue during rest. It was confirmed that the level of VAS after EMS training was lower than after rest and fatigue. It was also confirmed that EMS training, which combines EMS with socks, was effective in reducing pain. The experimental action is a measurement action of WBLT and lying posture, and the situation before and after EMS training was compared by performing 30 minutes on the treadmill to cause delayed muscle pain during exercise. As a result of this study, it was found that pain reduction and ROM function were improved when electrical stimulation was performed using EMS socks. It was also confirmed that the application of electrical stimulation to EMS socks effected on ankle fatigue and function improvement. From the study results, it is expected that wearing socks equipped with EMS significantly reduces ankle injuries and improves functional recovery for home training participants.

• 정보처리학회논문지D
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• 제10D권3호
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• pp.501-512
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• 2003

본 논문은 다차원 타임 워핑 거리 함수를 이용하여 유사한 이미지 서브시퀀스를 신속하게 검색할 수 있는 색인 방법을 제안한다. 타임 워핑 거리는 시퀀스들의 길이가 다르거나 샘플링 비율이 다른 많은 응용에서 Lp 거리보다 더욱 적합하다. 우리가 제안한 색인 방법은 디스크 기반의 접미어 트리를 색인 구조체로 채택하고, 유사하지 않은 서브시퀀스를 잘못된 누락 없이 잘 여과하기 위해 하한 거리 함수를 사용한다. 이 방법은 특정 차원의 상대적 가중치를 손쉽게 부여하기 위해 정규화를 적용하고 색인 트리를 압축하기 위해 이산화 과정을 수행한다. 메디컬 이미지와 합성 이미지 시퀀스를 대상으로 한 실험은 본 논문에서 제안한 방법이 naive한 방법보다 우수한 성능을 보이고 대용량의 이미지 시퀸스 데이터베이스로의 확장이 용이함을 입증한다.

• Journal of Astronomy and Space Sciences
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• 제37권3호
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• pp.199-208
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• 2020

This paper presents a kinematic ephemeris generator for Korea Pathfinder Lunar Orbiter (KPLO) and its performance test results. The kinematic ephemeris generator consists of a ground ephemeris compressor and an onboard ephemeris calculator. The ground ephemeris compressor has to compress desired orbit propagation data by using an interpolation method in a ground system. The onboard ephemeris calculator can generate spacecraft ephemeris and the Sun/Moon ephemeris in onboard computer of the KPLO. Among many interpolation methods, polynomial interpolation with uniform node, Chebyshev interpolation, Hermite interpolation are tested for their performances. As a result of the test, it is shown that all the methods have some cases that meet requirements but there are some performance differences. It is also confirmed that, the Chebyshev interpolation shows better performance than other methods for spacecraft ephemeris generation, and the polynomial interpolation with uniform nodes yields good performance for the Sun/Moon ephemeris generation. Based on these results, a Kinematic ephemeris generator is developed for the KPLO mission. Then, the developed ephemeris generator can find an approximating function using interpolation method considering the size and accuracy of the data to be transmitted.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1994년도 추계학술대회
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• pp.31-38
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• 1994

This paper proposed signal decomposition and multiresolution representation through wavelet transform using wavelet orthonormal basis. And it suggested most appropriate filter for scaling function in multiresoltion representation and compared two compression method, arithmetic coding and Huffman coding. Results are as follows 1. Daub18 coefficient is most appropriate in computing time, energy compaction, image quality. 2. In case of image browsing that should be small in size and good for recognition, it is reasonable to decompose to 3 scale using pyramidal algorithm. 3. For the case of progressive transmittion where requires most grateful image reconstruction from least number of sampls or reconstruction at any target rate, I embedded the data in order of significance after scaling to 5 step. 4. Medical images such as information loss is fatal have to be compressed by lossless method. As a result from compressing 5 scaled data through arithmetic coding and Huffman coding, I obtained that arithmetic coding is better than huffman coding in processing time and compression ratio. And in case of arithmetic coding I could compress to 38% to original image data.

• 전기전자학회논문지
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• 제11권4호
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• pp.219-226
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• 2007

본 논문은 HDR(High Dynamic Range) 영상을 기존의 JPEG 압축 방법을 이용하여 효율적으로 압축할 수 있는 방안을 제안한다. 입력 HDR 영상을 동적 영역 압축(Dynamic range compression)하여 통해 얻어지는 LDR(Low Dynamic Rage) 영상 및 HDR 영상과 LDR영상의 비율을 나타내는 비율 (Ratio) 영상으로 분리한다. LDR 영상은 하위 호환성을 유지하기 위해 기존의 JPEG 알고리듬을 이용하여 압축하며, 비율 영상은 각 블록별로 HVS(Human Visual System)이 인지하는 차이를 모델링 한 비용함수를 최소화 하도록 압축한다. 따라서 제안하는 알고리듬을 적용하면 동일한 조건에서 압축된 결과 영상에 왜곡이 적게 발생하게 되며, 컴퓨터 모의실험을 통해 그 유효성을 확인한다.

• 패션비즈니스
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• 제14권5호
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• pp.66-77
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• 2010

This study aimed at examining the pattern and detailed formation of corset look which has established itself as a sort of fashion look as people began to wear underwear as part of outer garment. The study tried to present basic materials helpful for developing and creating the design and pattern of corset look. First, the collected corset look of each brand was copied and then developed. According to the result, corset look's representative silhouette turned out to be hourglass silhouette that tightened up the waist with an emphasis on expressing the beauty of the body. However, unlike corsets of the past, corsets today are being created with focus on the design rather than using lots of incision lines. Second, The bust girth of corset look items turned out to have little function to compress and deform the body like the corset of the past that was far smaller than the body. In addition, the corset style that used the lines of corset alone as motive turned out to have the larger waist girth. Third, the dismantling of collected corset look showed that the materials and formation features of corset look have become simple and that the simplification of corset look has made the items of corset look everyday clothes which can be worn practically and universally.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1998년도 Proceedings of International Workshop on Advanced Image Technology
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• pp.165-170
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• 1998

This paper presents a new prediction method RBP region-based prediction model where the context used for prediction contains regions instead of individual pixels. There is a meaningful property that RBP can partition a cartoon image into two distinctive types of regions, one containing full-color backgrounds and the other containing boundaries, edges and home-chromatic areas. With the development of computer techniques, synthetic images created with CG (computer graphics) becomes attactive. Like the demand on data compression, it is imperative to efficiently compress synthetic images such as cartoon animation generated with CG for storage of finite capacity and transmission of narrow bandwidth. This paper a lossy compression method to full-color regions and a lossless compression method to homo-chromatic and boundaries regions. Two criteria for partitioning are described, constant criterion and variable criterion. The latter criterion, in form of a linear function, gives the different threshold for classification in terms of contents of the image of interest. We carry out experiments by applying our method to a sequence of cartoon animation. We carry out experiments by applying our method to a sequence of cartoon animation. Compared with the available image compression standard MPEG-1, our method gives the superior results in both compression ratio and complexity.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.275-275
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• 2022

One of the most widely grown food crops in the world, wheat, is increasing more lodged since for increased rains and winds caused by abnormal climate. During the Green Revolution, shorter wheat cultivars were bred using many Rht genes to increase lodging resistance. However, since only some Rht genes were used for breeding shorter wheat, it may have had a limited impact on wheat breeding and reduced genetic diversity. Therefore, it is essential to search for genes that have breeding potential and affect dwarfism in order to increase the genetic diversity of dwarf characteristics in wheat. In this study, we performed the RNA-seq between 'Keumkang' and 'Komac 5' ('Keumkang' mutant) to analyze the difference in plant height. Differentially expressed genes (DEGs) analysis and Gene function annotation were performed using 265,365,558 mapped reads. Cluster set analysis was performed to compress and select candidate gene DEGs affecting plant height, stem and internode. Gene expression analysis was performed in order to identify the functions of the selected genes by condensing the results of the DEG analysis into a cluster set analysis. This analysis of these plant height-related genes could help reduce plant height, improve lodging resistance, and increase wheat yield. Its application to wheat breeding will also affect the increased genetic diversity of wheat dwarfism.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제32권3호
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• pp.222-225
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• 2006

The treatment objective of mandibular fracture is a return to normal function. According to Champy, a rigid fixation of mandibular angle fracture is performed by using 4 or 6 holes titanium miniplates on the external oblique ridge of mandible. However, the limitations of metal plate such as hypersensitivity, interference with the cranio-facial growth of growing child, secondary bone resorption around the plate, foreign body reaction, declination of primary callus formation, and bone atrophy due to the lack of normal stress reaction of the bone have been reported. Recently, biodegradable miniplate has been introduced and used as an alternative to the metal plate despite its lower strength than that of the titanium plate and the side effect caused by the resorption in the body. In this study, 61 patients diagnosed as mandibular angle fracture and treated from Jan. 1998 to Dec. 2004 in our department have been reviewed. Metal plate fixation was used in 50 patients and biodegradable plate fixation in 11 patients on the external oblique ridge around the fractured mandibular angle according to the principle of monocortical osteosynthesis by Champy. We compared the incidence of side effects and the degree of bony union at the mandibular inferior border in two different fixation methods. In conclusion, we have found that one miniplate regardless of matter could provide enough strength to grasp bony fragments of the tension site and compress the inferior border of mandible without any complications.