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백승조,이상준,Baek, Seung-Jo,Lee, Sang-Joon 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.10
The turbulent shear flow around a surface-mounted vertical fence was investigated using the two-frame PTV system. The Reynolds number based on the fence height(H) was 2950. From this study, it is revealed that at least 400 instantaneous velocity field data are required for ensemble average to get reliable turbulence statistics, but only 100 field data are sufficient for the time-averaged mean velocity information. Various turbulence statistics such as turbulent intensities, turbulence kinetic energy and Reynolds shear stress were calculated from 700 instantaneous velocity vector fields. The fence flow has an unsteady recirculation region behind the fence, followed by a slow relaxation to the flat-plate boundary layer flow. The time-averaged reattachment length estimated from the streamline distribution is about 11.2H. There exists a region of negative Reynolds shear stress near the fence top due to the highly convex (stabilizing) streamline-curvature of the upstream flow. The large eddy structure in the separated shear layer seems to have significant influence on the development of the separated shear layer and the reattachment process.
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胃癌과 胃潰瘍에서 Enterocolic Metaplasia의 出現像
白承祚,李東久 慶北大學校 醫科大學 1984 慶北醫大誌 Vol.25 No.2
胃癌 및 胃潰瘍에서의 enterocolic metaplasia의 出現樣相을 알아보기 위하여 25例의 胃癌標本과 21例의 胃潰瘍標本을 組織構築學的으로 觀察한 結果를 要約하면 다음과 같다. Enterocolic metaplasia의 出現은 胃癌은 25例中 19例(76.0%)에서, 胃潰瘍은 21例 중, 2例(9.5%)에서 있었으며 그 樣相은 다른 型의 metaplasia가 This study was conducted to investigate patterns of appearance of enterocolic metaplasia in gastric ulcer and cencer. Twenty one specimens of gastric ulcer and twenty five specimens of gastric cancer were analysed topographically. The results obtained were as follows: Enterocolic metaplasia was noted in 2 cases(9.5%) out of 21 cases in gastric ulcer and 19 cases(76.0%) out of 25 cases in gastric cancer, and was focally distributed in severely developed intestinal metaplasia. The morphological pattern of enterocolic metaplasia was singular in ulcer and singular or in aggregates in cancer. Enterocolic metaplasia was noted mostly apart from the cancer nests. In regard to the above results, it suggests that enterocolic metaplasia not be related directly to the development of gastric cancer.
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백승조,이상준 대한기계학회 1995 대한기계학회논문집 Vol.19 No.7
A new particle tracking algorithm using the concept of match probability between two consequent image frames has been developed to obtain an instantaneous 2-dimensional velocity field. A computer simulation has been carried out to check the performance and usefulness of the developed algorithm by comparing with the conventional 4-frame Particle Tracking Velocimetry(PTV) method. As a result the newly developed algorithm shows very good performance. Although the major part of the developed algorithm is time-consuming iterative updating routine of match probability, computational elapse time to get the resonable results is a very short compared with the 4-frame PTv.Additionally, the present 2-frame PTV algorithm recovers more velocity vectors and has higher dynamic range and lower error ratio compared with the conventional 4-frame PTV.
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백승조,이상준,Baek, Seung-Jo,Lee, Sang-Jun 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.6
A 2-frame PTV (particle tracking velocimetry) system using the concept of match probability between two consequent image frames has been developed to obtain instantaneous velocity fields. The overall 2-frame PTV system including image pre-processing, tracking algorithm and post-processing routine was implemented to apply to real flows. The developed 2-frame PTV system has several advantages such as high recovery ratio of velocity vectors, low error ratio and small computational time compared with the conventional 4-frame PTV and the FFT-based cross-correlation PIV technique. The 2-frame PTV system was applied to a turbulent channel flow over a rectangular block to check its reliability and usefulness. Total 96 sequential image frames have been captured and processed to get both mean and fluctuating velocity vector fields over the recirculating region. The mean velocity and turbulent intensity profiles were well agreed with hte LDV measurements in the separated region behind the block. Time-averaged reattachment length is about 6.3 times of the block height.
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실험적 Amyloidosis 형성에 관한 초미형태학적 연구
권건영,장은숙,백승조 啓明大學校 醫科大學 1992 계명의대학술지 Vol.11 No.2
This study was carried out to investigate the mechanism of experimentally induced amyloidosis in mice treated with casein. Eighty-five ICR mice, maintained on a stock diet, weighing 20:30 g, were divided into a control group and two experimental groups. Group 1. Control group (5 mice). Daily subcutaneous injection of normal saline for 4 weeks. Group 2. Casein group (40 mice). Daily subcutaneous injection of a casein solution. Group 3. Casein-endotoxin group (40 mice). Daily subcutaneous injection of a casein-endotoxin solution. The liver and the spleen of sacrificed naimals were processed and observed by light microscope, polarizing microscope, and transmission and scanning electron microscopes. Also some of the animals were given intravascular injection of a ferritin and an india ink solution. The results were as follows: On light microscopy, deposits of the amyloid protein were clearly demonstrated in the portal-periportal areas of the liver and the perifollicular regions of the spleen after 3 weeks, and by 4 weeks and 6 weeks the deposits were far more wide-spread to hepatic sinusoids and splenic red pulps. The amyloid deposits were similar but more striking findings were seen in the casein-endotoxin group. This group revealed a more prominent extravascular influx of plasma including ferritin or india ink particles than in the casein group. The amyloid fibrils were stained positively with Congo red and they showed green birefringence when viewed under a polarizing microscope. On immunohistochemistry, amyloid protein associated fibrils were identified. On electron microscopy (TEM and SEM), damaged blood vessels near the amyloid deposits revealed multiple endothelial gaps, a loss of identifiable basement membrane and variable degree of endothelial degeneration. Amyloid deposits were made up of nodular masses of randomly arranged nonbranching fibrils and seen mainly in extracellular areas. Closely connected with the amyloid deposits, hepatocytes, Kupffer cells and splenic macrophages contained numerous lysosomal dense bodies, elongasted dense inclusions and membrane bound fibrillar structure. In a later stage (6 weeks), irregular shaped phagosomes were found in the cytoplasm of amyloid forming cells. It can be concluded that: The vascular injury appeared to be caused by an immunologic reaction to casein. An addition of the endotoxin caused vascular damage and promoted amyloid depostion. The hepatocytes, Kupffer cells and splenic macrophages were thought to play in important role in casein-induced amyloid formation. From this study, it is suggested that amyloid associated (AA) fibrils are polymerized in the cytoplasm of the amyloid producting cells by the proteolytic clevage of previously synthesized or serum derived amyloid A precursor protein.
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백승조(Seung-Jo Baek),임종인(Jongin Lim) 한국정보보호학회 2010 정보보호학회논문지 Vol.20 No.6
본 논문은 범죄에 사용될 수 있는 암호의 이중사용의 특성 때문에 발생 가능한 수사권 약화라는 암호의 역기능과 키복구 시스템과 복호화명령제도와 같은 피의자 개인의 암호이용에 대한 통제정책에 대해 살펴본다. 또한 피의자로서의 개인의 암호이용에 대한 통제 정책에서 발생가능한 수사권과 프라이버시권 등 다양한 개인의 헌법적 권리들에 대한 침해 위험을 살펴보고, 각 정책을 과잉규제금지원칙을 적용하여 구체적으로 분석해본다. 마지막으로 국민의 권리와 수사권 확보를 보장하는 균형 잡힌 국내암호통제정책 수립을 위해 고려해야 할 요소들과 대안적인 정책방향을 제시한다. In this paper, we study the dysfunctions of cryptography as dual-use goods and national domestic encryption control policies like key recovery system and decryption order. And we examine risks of the breach of the peoples' constitutional rights like the right to privacy in these policies and analyze these policies by applying the principle of the ban on the over-restriction. Finally, we propose the direction and requirements of our national domestic encryption control policy that maintains the balance of peoples' constitutional rights and investigatory powers.
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