칼라 영상 예측 부호화를 위한 객체 기반 스펙트럴 상관성 추정 기법

곽노윤,황병원 한국항공대학교 1999 論文集 Vol.37 No.-

본 논문은 칼라 성분 영상들 간에 내재된 스펙트럴 중복성에 착안하여 움직임 추정과 유사하게 한 성분 영상에서 다른 성분 영상을 영역 기반으로 예측 부호화함으로써 칼라 영상 부호화 시에 고압축을 실현할 수 있도록 한 영역 기반 칼라 영상 예측 부호화에 관한 것이다. 우선, 각 칼라 성분들간의 색차 성분을 화소 단위로 합산한 색차합 영상을 산출한 후, 색차합 영상을 대상으로 영역 분할을 수행한다. 이후, R, G, B 영상 중에서 임의로 선정한 두 칼라 성분 영상에 대해 휘도 영상과 각 칼라 성분 영상간의 추정 오차가 최소가 되도록 하는 비례 인자와 가감 이자를 객채 영역당 하나씩 산출하는 과정을 반복적으로 수행한 후, 이렇게 추정한 각각의 비례인자와 가감 인자를 부호화함으로써 칼라 성분을 추정 부호화할 수 있는 새로운 칼라 영상 부호화 방법을 제안한다. 시뮬레이션 결과를 통해 같은 PSNR에서 두 칼라 성분 영상을 부호화하기 위해 소요되는 단위 화소당 비트를 비교해 볼때, 제안된 칼라 영상 부호화 방법은 DCT 기반칼라 영상 압축 방법에 비해 수십 배 정도의 추가적인 압축 효과를 제공함을 확인할 수 있었다. This paper is relates to a new color image coding method for predictively encoding color image by estimating object-based spectral correlation, and particularly to predictive color image coding which estimates one component image from other component image for removing spectral redundancy included between color component images. First, chroma-summation image between color component images is obtained, and then for segmenting the object region which is the unit for estimating spectral correlation, image segmentation for chroma-summation image is performed. Next, the step calculating a scale factor and a offset factor for each the object capable of minimizing the estimation error between luminance image Y and each color component image, is iteratively applied to two color component images arbitrarily selected among R, G and B images. In the computer simulation, the proposed coding method provides the compression ratio being the maximum several tens times higher than DCT-based color component image coding method in aspect of bpp required to encode two color component images for the same PSNR

化學펄프 製造에 微生物의 應用 可能性

李宣鎬,尹炳虎,李元用 江原大學校 森林科學硏究所 1997 Journal of Forest Science Vol.13 No.-

要 約 백색부후균인 Fomes pini (Thore) Lloyd에 의해 처리된 chip을 anthraquinone(AQ)을 첨가하여 화학 펄프화를 실시하여 얻은 결과를 미처리재의 것과 비교하였다. 균처리함에 의해 카파값 20에서의 H factor는 소다와 크라프트 증해에서 각각 17%와 15%가 감소되었다. 이러한 결과는 목재를 백색부후균으로 처리함으로 인해 탈리그닌이 용이해졌음을 나타내는 것이다. 비페놀성 β-0-4 화합물인 veratrylglycerol-β-guaiacyl ether(I)와 페놀성 β-0-4 화합물인 syringylglycerol-β-syringyl ether(III)에 백색부후균을 작용시키면 반응생물로서 각각 α-guaiacoxy-β -hydroxypropioveratrone(II)과 α-syringyloxy- β -hydroxypropiosyringone (IV)이 생성됨이 밝혀겼다. 따라서 목재에 균처리를 함으로서 카르보닐기가 리그넌의 측쇄 α위에 도입되어 그로 인해 탈리그닌이 용이하게 된 것으로 여겨진다. ABSTRACT The decayed wood by Fomes pini (Thore) Lloyd required a smaller H factor than the sound wood for pulping to permanganate number 20. The H factors for the wood pulping by the kraft and soda processes were reduced by 15% and 17%. respectively. in the presence of 1% anthraquinone. The wood components degraded by fungi are normally more readily solubilized in alkali than the corresponding components in sound wood. The nonphenolic β-0-4 type lignin model compound. veratrylglycerol-β-guaiacyl ether(I), and phenolic model compound, syringlglycerol-β-syringyl ether(III). were degraded by the white-rot fungi to yield α-guaiacoxy-β-hydroxypropioveratrone(II) from the former and α-syringyloxy-β-hydroxypropiosyringone(IV) from the latter. Structures of the degradation products indicated that C r-oxidation could occur with wilite-rot fungi. It has been shown that the alkaline cleavage of β -aryl ether bonds in the lignin units is accelerated by the presence of α-carbonyl groups.

자가 면역성 간염에서 자가항체의 발현 양상과 스테로이드 치료의 효과

박기오,채경훈,허원석,강윤세,정재훈,김연수,문희석,이엄석,김선문,이병석,김남재,이헌영 충남대학교 의과대학 의학연구소 2003 충남의대잡지 Vol.30 No.1

목적 : 최근 8년간 본원에서 경험한 자기면역성 간염의 혈액학적 특징과 스테로이드의 치료효과를 알아보고자 본 연구를 시행하였다. 방법 : 1996년 이후부터 2002년까지 충남대학교 병원에서 1999년 International Autoimmune Hepatitis Group(LAHG)에서 제시한 수정 진단 기준안에 의거하여 총 진단점수가 probable 이상에 해당하는 환자들을 대상으로 임상적 특징, 검사실 및 조직 소견과 스테로이드와 azathioprine의 치료 효과를 후향적으로 조사하였다. 결과 : 9예의 환자들은 여성이 78%, 40대가 많았고, 급성 발병이 33.3%, 피로감, 식욕부진 및 황달 등이 나타났으며, 항핵항체가 55.6%에서 그리고 항평활근 항체가 77.8%에서 양성이었고, 동반 질환은 류마치스 관절염이 2예, 특발성 혈소판 감소증 1예, Henoch-Sch nlein 자반증 및 그레브스병이 각각 1예 씩이었다. 7예에 대해서 스테로이드와 azathioprine으로 치료하여 생화학적 임상적 완해가 이루어져서 유효한 치료 결과를 얻었다. 결론 : 자가면역성 간염은 우리 나라에서 원인을 찾을 수 없는 만성 간질환의 경우, 특히 중년여성에서 다른 자가면역성 질환이 동반되었을 때 자가면역성 간염을 의심하여 자가항체 선별검사를 시행해 보아야 할 것으로 생각된다. 향후 다기관 연구를 통하여 좀 더 많은 증례를 모으고 전향적인 연구를 시행하여야 할 필요가 있다. Although autoimmune hepatitis(AIH) is common in western contries, some studties have been reported in Korea. The aim of the study was to analyze the clinical and histological features and expression pattern of the autoantibody and to examine clinical course of AIH in Korea. For 9 patients diagnosed as having AIH in our hospital since 1996, we reviewed medical records and analyzed clinical and laboratory findings retrospectively. They had a probable or definite AIH according to the revised criteria of International AIH group. The mean age was 42.7(21∼68)years and 7(77.8%) were female. Three of them(33.3%) showed acute hepatitis and five of them showed cirrhosis. Fatigue and anorexia were the most frequently complained symptoms(55.6%). Four patients(44.4%) were accompanied with other autoimmune diseases. Antinuclear antibody was detected in 5(55.6%) and anti-smooth muscle antibody was detected in 7(77.8%). Three patients showed focal picemeal necrosis and four showed periportal fibrosis. Among 7 patients who received immunosuppressive therapy, six patients(85.7%) showed initial response. and biochemical and serologic remission were achived in 5(71.4%) and 3(42.8%) patients, AIH seems to be partly responsible for chronic liver disease of unknown etiology in Korea. AIH should be suspected in female patients with unknown chronic liver disease of unknown etiolgy, especially accompanied with other autoimmune disease. The clinical characteristics of AIH may not be quite different from those of Western countries.

Determination of Frequency Independent Critical Concentration of Xathan and Carob Mixed Gels

Won Byong Yoon,Sundaram Gunasekaran 한국식품과학회 2007 Food Science and Biotechnology Vol.16 No.6

The frequency independent critical concentration (Cc) of xanthan and carob (X/C) mixed gel was determined based on the Winter-Chambon’s theory. X/C mixed (X/C=1:1 ratio) gels were prepared from 0.1 to 1% of concentration. The linear viscoelastic properties, i.e., storage and loss modulus, of X/C mixed gel at 20oC were measured by frequency sweep tests. The frequency independence of tangent function of phase angle (tan δ) of X/C mixed gels was graphically determined from the intersection of the plot of phase angle against concentration at varied frequencies. The intersection (C=0.43%) was considered to be Cc of X/C mixed gel.

Investigation of Linear Viscoelastic Properties of Xanthan-Carob Mixture in Sol and Gel States

Won Byong Yoon,Sundaram Gunasekaran 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.3

Synergistic interactions between xanthan (X) and carob (C) were investigated by studying the linear viscoelastic behavior of X, C, and X/C mixtures at sol and gel states. At the solution state, storage modulus (G’) dominates the linear viscoelastic properties of X/C mixtures. The gelation temperature (52 to 57℃) was weakly dependent on the xanthan fraction (φX) in the mixture. The φX also had a strong effect on G’ until φX=0.5. The elastic active network concentration (EANC) of X/C gels was estimated from the pseudo-equilibrium modulus. The EANC for systems with φX=0.25, 0.5, 0.75, and 1 at 1% total concentration was 2.3, 4.4, 4.1, and 0.32 (×10?³ ㏖/㎥), respectively. The maximum synergistic effect was observed at about φX=0.5. The G’ at the transition state of X/C mixed gel was proportional to ω<SUP>3/2</SUP> at ω>ωtr (the onset transition frequency) compared to the theoretical limit of ω<SUP>1/2</SUP>.

Research Note : Effect of Pre-shearing and Temperature on the Yield Stress of Stirred Yogurt

( Won Byong Yoon ) 한국산업식품공학회 2009 산업 식품공학 Vol.13 No.1

The yield stress of stirred yogurt was measured by the vane viscometer at different pre-shearing conditions, such as pre-shear speed, pre-shear time, and wait time, and temperature (12-38℃). The yield stress ranged from ~17.6 to 10 Pa and from 34.2 to 11.9 Pa, depending on the pre-shearing conditions and temperature, respectively. The pre-shear speed and the wait time significantly affected the yield stress. The temperature dependence of the yield stress was described by the Eyring`s kinetic model. The linear function of the temperature on the yield stress was limited at the 22℃, and at the above 22℃, the yield stress was maintained to be a constant (~12.5 Pa).

Evaluation of Structure Development of Xanthan and Carob Bean Gum Mixture Using Non-Isothermal Kinetic Model

Won Byong Yoon,Sundaram Gunasekaran 한국식품과학회 2007 Food Science and Biotechnology Vol.16 No.6

Gelation mechanism of xanthan-carob mixture (X/C) was investigated based on thermorheological behavior. Three X/C ratios (1:3, 1:1, and 3:1) were studied. Small amplitude oscillatory shear tests were performed to measure linear viscoelastic behavior during gelation. Temperature sweep (-1℃/min) experiments were conducted. Using a non-isothermal kinetic model, activation energy (Ea) during gelation was calculated. At 1% total concentration, the Ea for xanthan fraction (φ_x)=0.25, 0.5, and 0.75 were 178, 159, and 123 kJ/mol, respectively. However, a discontinuity was observed in the activation energy plots. Based on this, two gelation mechanisms were presumed-association of xanthan and carob molecules and aggregation of polymer strands. The association process is the primary mechanism to form 3-D networks in the initial stage of gelation and the aggregation of polymer strands played a major role in the later stage.

Development of Repeatable Measuring Apparatus for Texture of Surimi Gels

Won Byong Yoon,Hwabin Jung,Jae W. Park 한국식품영양과학회 2019 한국식품영양과학회 학술대회발표집 Vol.2019 No.10

Differentiation of isoflavones of breeding populations between high and low isoflavones soybean

Byong Won Lee,Myeong Gi Jong,Min Ko,Hyun Tae Kim,Won-Young Han,Sang-Ouk Shin,Hong Tae Yoon,In Youl Baek 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07

Soybean isoflavones include daidzein, genistein and glycitein with their glycosides, and their malonated derivatives are the main polyphenolic compounds that are helpful for human health. Our research objective was to investigate the differentitation of soybean isoflavones contents of breeding populations between high and low isoflavones contained soybean. Isoflavones contents in soybean are a wide range from 500 to 7000 ㎍/g. In this study, we used Ilmi (Isoflavones content, 3.108 ㎍/g) as male parent and Dajin (Isoflavones content, 578 ㎍/g) as female parent. From these varieties, we got 165 breeding lines which have isoflavones content range from 472 to 2973 ㎍/g. Isflavone contents in breeding lines showed normal distribution.

Inhibitory Effect of Acid Treatment on the Growth of Bacillus cereus in Cooked Rice Cake

Won Byong Yoon,Timilehin Martins Oyinloye,Park Cho Bin 한국식품영양과학회 2019 한국식품영양과학회 학술대회발표집 Vol.2019 No.10