Studies on Molecular Structure Changes in Polyethylene/Polypropylene Sheath-Core Monofilament

서영호,임영민,오태환,한성수,남영식,남승민,함진수,Seo, Young Ho,Lim, Young Min,Oh, Tae Hwan,Han, Sung Soo,Nam, Young Sik,Nam, Seung Min,Ham, Jin Soo The Korean Fiber Society 2014 한국섬유공학회지 Vol.51 No.2

In this study, changes in the molecular structure of a sheath-core polyethylene (PE)/polypropylene (PP) bicomponent monofilament were investigated using different fractions of sheath or core components. The melt complex viscosity of sheath PE showed a greater shear thinning behavior than core PP. For both as-spun and drawn filaments, the crystal structure of sheath PE developed better than that of core PP. In the as-spun monofilament, the core PP crystal structure did not develop well, while sheath PE showed a more developed crystal structure. Further, sonic velocity indicating the molecular orientation increased upon drawing but was rarely dependent on the sheath PE fraction for both as-spun and drawn monofilaments.

발열(發熱)환자에 대한 보중익기탕(補中益氣湯) 치험(治驗) 2례

서영호,전귀옥,권은희,문정환,최해윤,김종대,송광규,Seo, Young-Ho,Jeon, Kwi-Ok,Kwon, Eun-Hee,Moon, Jung-Hwan,Choi, Hae-Yun,Kim, Jong-Dae,Song, Kwang-Kyu 대한한방내과학회 2004 대한한방내과학회지 Vol.25 No.4

Fever is a rise in body temperature from any of a variety of causes. One might even feel a fever when body temperature is normal. An imbalance of Yin and Yang due to exogenous pathogenic factors or internal damage is usually considered the cause of fever in Oriental Medicine. Fever from deficiency of Qi is one of the major components of the theory of fever due to internal damage. Clinically, such cases are usually encountered along with wasting diseases and fever does not run high. The compliment of Qi is usually considered the appropriate treatment in these cases. Oriental Medical treatment was performed using herbal medicine after the cause of fever was diagnosed as deficiency of Qi. The herb medicine used in these cases was mainly Bojoongikki-tang(補中益氣湯). Through those treatments good results were seen. More clinical case reports are needed.

다중 GPGPU를 이용한 컴퓨터 생성 홀로그램의 병렬화 구현

서영호,이윤혁,김동욱,Seo, Young-Ho,Lee, Yoon-Hyuk,Kim, Dong-Wook 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.5

Computer-generated hologram (CGH) is to mathematically model optical phenomenon with digital computer. Because it requires huge amount of computational power, a fast and high performance technique is needed. In this paper, we proposed two parallelizations for CGH calculation. The first is to parallelize CGH algorithm in a GPU (general processing unit) and the second is to parallelize multiple GPUs. The proposed algorithm was implemented in GTX780 Ti GPU. It calculates a $1,024{\times}1,024$ hologram with 10K object points for about 24ms.

DWT 영역에서의 주파수 정보를 활용한 가변 윈도우 기반의 스테레오 정합 알고리즘

서영호,구자명,김동욱,Seo, Young-Ho,Koo, Ja-Myung,Kim, Dong-Wook 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.7

본 논문에서는 스테레오 카메라 환경에서 고속으로 깊이 정보를 얻기 위한 응용분야에 적합한 스테레오 정합 기법을 제안하고자 한다. 이러한 조건을 만족하기 위해서 DWT 영역에서의 주파수 정보와 가변 정합창을 이용하는 적응적인 스테레오 정합 기법을 제안한다. 공간 영역에서 영상의 국부적인 특성을 분석하여 정합창의 크기를 결정하고, 주파수 영역에서 영상의 주파수 특성을 분석하여 정합창의 형태 및 스케일링 요소를 결정한다. 주파수 영역에 대한 정보를 이용하기 위해서 로컬 DWT와 전역 DWT를 활용하는 기법을 모두 적용하였다. 본 논문은 스테레오 정합을 위한 제안한 기법은 유사한 수준의 복잡도에서 고정 정합창 기반의 기법과 비교할 때 PSNR이 향상되는 것을 확인하였다.

깊이 및 텍스쳐 영상 기반의 3D 입체 영상을 위한 워터마킹 알고리즘

서영호,김보라,김동욱,Seo, Young-Ho,Kim, Bo-Ra,Kim, Dong-Wook 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.3

Since the depth and texture images have been widely used for generating 3-dimensional stereoscopic image, the security of them have been focused. In this paper, we propose a new watermarking technique for copyright of stereo and multiview images which is generated in an arbitrary viewpoint by depth and texture image. After the mark space is selected for preserving watermark through DIBR (depth-image-based rendering) process which uses 3D warping, the texture image is transformed to the frequency coefficient using 2D DCT (discrete cosine transform). Some parts of them are quantized, which is the corresponding process to watermarking. The embedded watermark is not conformed by eyes, so we identified the invisibility of the proposed method. In case of appling attacks of general image process, we also identified the robustness of it.

COX-2 억제제에 의한 AKT 경로를 통한 구강편평세포암종 세포주의 세포사멸 유도

서영호,한세진,이재훈,Seo, Young-Ho,Han, Se-Jin,Lee, Jae-Hoon 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.1

The objectives of this study was to check up the effect of celecoxib, COX-2 inhibitor, on the pathogenesis of oral squamous cell carcinoma. After mefenamic acid, aspirin and celecoxib, COX-2 inhibitor, were inoculated to HN 22 cell line, the following results were obtained through tumor cell viability by wortmannin, growth curve of tumor cell line, apoptotic index, PGE2 synthesis, total RNA extraction, RT-PCR analysis and TEM features. 1. When wortmannin and celecoxib were given together, the survival rate of tumor cells was lowest about 47 %. So wortmannin had an effect on the decrease of survival rate of tumor cells. 2. In growth curve, the slowest growth was observed in celecoxib inoculated group. 3. The synthesis of PGE2 was decreased in all group and the obvious suppression and highest apoptotic index was observed in celecoxib inoculated group. 4. Suppression of expression of COX-2 mRNA was evident in celecoxib inoculated group. But that of COX-1,2 mRNA was observed in mefenamic acid inoculated group and aspirin inoculated group. 5. In celecoxib inoculated group, mRNA expression of AKT1 was decreased and that of PTEN & expression of caspase 3 and 9 was evidently increased. Depending on above results, when celecoxib was inoculated to oral squamous cell carcinoma cell line, an increase of mRNA expression of caspase 3,9 and PTEN is related to a decrease of mRNA expression of AKT1. Wortmannin had an effect on the decrease of survival rate of tumor cells. Celecoxib might induce apoptosis of tumor cell by suppression of AKT1 pathway and COX-2 inhibition. This results suggested that COX-2 inhibitor might be significantly effective in chemoprevention of oral squamous cell carcinoma.

효율적인 SoC 논리합성을 위한 혼합방식의 설계 방법론

서영호,김동욱,Seo, Young-Ho,Kim, Dong-Wook 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.3

In this paper, we propose two main points. The first is the constraint for logic synthesis, and the second is an efficient logic synthesis method. Logic synthesis is a process to obtain the gate-level netlist from RTL (register transfer level) codes using logic mapping and optimization with the specified constraints. The result of logic synthesis is tightly dependent on constraint and logic synthesis method. Since the size and timing can be dramatically changed by these, we should precisely consider them. In this paper, we present the considering items in the process of logic synthesis by using our experience and experimental results. The proposed techniques was applied to a circuit with the hardware resource of about 650K gates. The synthesis time for the hybrid method was reduced by 47% comparing the bottom-up method and It has better timing property about slack than top-down method.

스테레오 영상의 소유권 보호를 위한 워터마킹 기법

서영호,구자명,김동욱,Seo, Young-Ho,Koo, Ja-Myung,Kim, Dong-Wook 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.8

In this paper, we propose a new watermarking technique for copyright protection of stereo image. The proposed technique embeds watermark to the region which corresponds to occlusion of the disparity map to be extracted by the proposed stereo matching and the frequency coefficient with the appropriate value. We use discrete wavelet transform for frequency transform tool. The proposed algorithm consists of stereo matching, watermark rearrange, mark space selection, and watermark embedding/extracting. We tested the experiment about 4 stereo images which are from Middlebury site. We embedded the watermark to 4 stereo images and extracted it from the images after attacks. We also visually analyzed the watermark embedding images in 3D TV environment.

열처리 조건이 화학적 재활용 염기성 염료 가염형 폴리에스터 원사의 구조 및 물성에 미치는 영향

서영호,조혜원,한성수,오태환,이기영,김병일,홍윤광,Seo, Young Ho,Cho, Hye Won,Han, Sung Soo,Oh, Tae Hwan,Lee, Ki Young,Kim, Byeong Ii,Hong, Yun Kwang 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.4

In this work, the annealing characteristics of chemically recycled cation dyeable poly(ethylene terephthalate) (CD PET) fibers were investigated and compared with those of regular CD PET. Recycled CD PET was polymerized using chemically recycled monomers of dimethyl terephthalate (DMT), which is chemically recycled from final products such as bottles and fibers. Mechanical properties and structural changes were studied for different annealing temperatures and times. The tensile properties and structural changes of recycled CD PET show similar behavior to those of regular CD PET. The crystal structure of chemically recycled CD PET developed well with increasing annealing temperature and time. At annealing temperature of $180^{\circ}C$, thermal shrinkage decreases to below 2% even after 10 min of annealing.

Effect of Annealing Conditions on Molecular Structure and Physical Properties of Polypropylene Slit-Film Yarns

서영호,한성수,오태환,김상운,Seo, Young Ho,Han, Sung Soo,Oh, Tae Hwan,Kim, Sang Woon The Korean Fiber Society 2013 한국섬유공학회지 Vol.50 No.3

The effects of various annealing temperatures and durations on the structure and physical properties of polypropylene (PP) slit-film yarns were investigated. Annealing led to a more developed crystal structure, even when the yarns were drawn before heat treatment. Annealing at $140^{\circ}C$ led to better developed crystal structures than that at $100^{\circ}C$. Annealing primarily affected the crystalline structure, whereas little change was observed in the molecular orientation of the yarns. The slitfilm yarns annealed at $140^{\circ}C$ showed less than 1% shrinkage. A very low-shrinkage slit-film yarn was obtained on annealing for 10 min at $140^{\circ}C$ or 20 min at $100^{\circ}C$.