Chebyshev Point로 보간하는 Continuous Image Zooming 기법에 관한 연구

조진만,황치정 충남대학교 1990 忠南科學硏究誌 Vol.17 No.2

In this paper, we proposed a new technique of continuous image zooming interpolation using Chebyshev points. There are so many different zooming techniques, but those may be classified with two categories, Discrete to Discrete and Discrete to Continuous. Our proposed technique belongs to Discrete to Continuous category and it can solve drawbacks of existing techniques such as jaggies, degradations integer times of magnification and etc.

세가지 형상의 부유식 방파제 특성에 대한 비교연구

조원철,한덕만,양우석,이진원 중앙대학교 기술과학연구소 2000 기술과학연구소 논문집 Vol.30 No.-

본 연구는 2차원 유한요소모델을 이용한 부유식 방파제의 파랑감쇠특성에 대한 이론적 연구이다. 유체의 운동은 선형적이고, 2차원적인 포텐셜 흐름으로 가정하고 수치해석을 수행하였으며, 2차원 유한요소해석과 무한요소해석을 채택하여 부유식 방파제 영역에 적용하였다. 따라서 2개의 영역에 있어 방파제 근처 영역에서는 유한요소해석을 적용하였으며, 그 외의 영역에서는 무한요소해석을 사용하였다. 방파제의 형식은 직사각형, 원형, 사다리꼴의 세가지 형상으로 하였으며, 그 결과를 기존의 실험결과와 비교하였다. A theoretical investigation on the wave-attenuation characteristics of floating breakwaters are presented. The fluid motion is idealized as linearized, two dimensional potential flow. A two-dimensional finite element model is adopted to study the performance of floating breakwaters. The near field region surrounding the solid body is modeld using conventional finite elements, however, the far field region is represented appling the infinite elements. Numerical analysis is carried out for floating breakwaters with three different cross-sectional shapes, rectangular, circular and trapezoidal shapes, respectively. Comparison with hydraulic experimental results measured in the past is carried out to prove the validity of the numerical results.

β-NSF계와 빈졸계 계면활성제로 변성된 인조석의 물성

조현영,박성기,김진만,서정목 공주대학교 자원재활용 신소재 연구센터 1999 1차년도 센터 성과집 Vol.1999 No.-

건축용 외장재로 사용되는 인조석은 혼합수, 시멘트, 석분, 경량골재를 사용하여 만들어지는데 본 연구에서는 제조단가를 낮추고 물성을 향상시키기 위하여 β-NSF제 계면활성제와 빈졸계 계면활성제를 사용하였다. 본 연구를 통해 β-NSF제와 빈졸계 계면활성제의 최적 배합비가 1.0wt%와 0.1wt%됨을 도출하였고, 새로 개발된 인조석은 기존의 인조석에 비하여 물성이 약 20% 증가하고, 동결융해 저항성이 300% 증가하였다. 그러나, 제조가격은 기존의 제품에 비해 30% 이상 감소된다. Extrior finishing matcrials of artificial stones are manufactured with minture of water, cement, stone powder and light-weight aggregate. In this rescarch, we tried to find a way of increasing the physicl properties and decreasing the manufacturing cost of artificial stone. So we used β-NSF base surfactant and vinsol base surfactant to the artifical stone mixture instcad of light weight aggregatc. The optimum dosage of the β-NSF and the vinsol surfactants for artificial stone are found to be 1.0 wt % and 0.1 wt % of cement, respectively. The physical properties increased ca 20% and the durability for freezing &thawing of the new frtificial stone increased ca 300% while the manufacturing cost of the new artificial stone decreased as much as 30%.

SPHIT 알고리즘의 개선을 통한 JPEG2000 정지영상 부호화에서의 압축효율 개선

조상현,김성현,김진만,주동현,김두영 東亞大學校附設 情報技術硏究所 2004 情報技術硏究所論文誌 Vol.12 No.1

With the increasing use of multimedia technologies, image compression requires higher performance as well as new functionality. Specially, in the specific area of still image encoding, a new standard, JPEG2000 was developed. This paper proposed SPHIT Algorithm that uses a method to optimized selection of threshold from feature of wavelet transform coefficients and to removes sign bit in LL area on JPEG2000. Experimental results show the proposed algorithm achieves more improved bit rate.

Poly-(acrylic acid-co-methylacrylate)합성조건에 따른 시멘트계 재료의 물성

조헌영,서정목,이효진,이기환,김진만,맹학영 공주대학교 생산기술연구소 2000 論文集 Vol.8 No.-

The water soluble polymers based on polycarboxlates are come into the spot-light in the detergent fields of CaCO_3, Al(OH)_3 and leather industries. In this research, we synthesized molecular weights(Mn) by changing the concentrations of monomer(acrylic acid-methylacrylate mixture), chain transfer agent(butanethiol) and initiator(ammoniumpersulfate). We investigated the influences on the fluidities(the flow & the mini slump) and the setting times of cement material admixtured with the copolymers by the statistical method. The optimum synthesis formulation of the poly-(AA-co-MA) for cement materials is at the concentrations of monomer 50 M%, chain transfer agent 6.0 M% and initiator 2.0 M%. The number-average molecular weight of that was decided on 7,600 by the viscosity method.

Carotenoids 식이와 알코올이 혈액학적 성분과 간조직에 미치는 영향에 관한 연구

조만희,김연선,이상한,우기민,장예진,김창세 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.2

Alcohol is well known agent which can damage the human tissues such as liver via stimulating lipid peroxidation and storage, denaturation of macromolecules, and inhibiting protein metabolism. On the other hand, carotenoids in addition to vitamins A, C, E and lipoic acid, play important roles in protecting these oxidative damages as well as preventing the production of free radicals. This study was carried out to elucidate the precise effects of alcohol administration into rats on the antioxidative functions of dietary carotenoids and isolated β-carotene, and to find out any parameters to uncover more detailed biochemical mechanisms of these agents. For these purposes, two different approaches were performed: 1) examination of the changes in hematological parameters (e.g., total proteins, A/G ratio, ALT/AST et. al) and statistical correlations among inter- and intragroups, 2) examination of the histopathological changes by an electron microscope. The results were analyzed and summarized as following; (1) Carrot diet for one week caused a slight increase in albumin. A/G ratio and AST levels, and a slight decrease in ALT, ALP, BUN and uric acid levels. Two-week alcohol administration following carrot diet increased total proteins, albumin A/G ratio and BUN levels. However, both groups were shown to have little significant changes in cholesterol concentrations. (2) Cheese diet for one week caused a significant increase in total proteins, albumin, AST, ALP, uric acid and total cholesterol levels, and a significant decrease in A/G ratio and glucose concentrations. However, two-week β-carotene diet following cheese intake increased total proteins albumin, A/G ratio, BUN and total cholesterol levels, whereas AST, ALT, ALP and uric acid levels were decreased. (3) Alcohol administration for one week caused an increase in AST activities and a decrease in total proteins, albumin, ALT, ALP and BUN levels. A successive β-carotene diet following alcohol administration increased total proteins, albumin, ALT, ALP and BUN levels, whereas decreased AST and uric acid levels. However, there were not significant changes in A/G ratio, glucose and total cholesterol levels in both groups. (4) β-carotene diet for one week caused a slight increase in albumin, glucose, AST and uric acid levels, and a slight decrease in ALP and BUN levels. Two-weeks alcohol administration following β-carotene diet increased albumin, glucose, BUN and total cholesterol levels, whereas decreased AST, ALT, ALP and uric acid levels. (5) Although the pathological investigation on the liver did not reveal significant changes, cheese diet group (CH-BC/1-CH) was shown to have some lipid deposits. Some results were unexpected and different from typical hematological changes shown by other researchers. Nonetheless, these results strongly suggest that the liver damage or hepatism caused by alcohol intake affects many kinds of biochemical metabolisms, which results in significant changes in many hematological parameters. In addition, dietary carotenoid and isolated β-carotene were shown to have protective roles against the biochemical changes by alcohol intake.

심실 조기 수축의 발생 부위 및 연결 간격의 차이에 따른 혈역학적 변화

진승원,김재형,노태호,조은주,김희열,이만영,김종진,박준철,채장성,홍순조,최규보 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.7

알코올 및 베타 카로틴이 혈액 성분에 미치는 영향에 관한 연구

조만희,우기민,김창세,장예진,이상한,조성호 순천향의학연구소 1997 Journal of Soonchunhyang Medical Science Vol.3 No.2

Human take in many kinds of foods, and also are exposed to various chemicals which may be harmful. Especially, some food and chemicals may give rise to free radicals during metabolism in the tissues. These free radicals, such as superoxide. hydroxy radical and hydrogen peroxide, induce oxidations of the macromolecules, which can cause a variety of damages in the body. But human have anti-oxidative mechanisms well developed against these damages. Anti-oxidants such as vitamines A, C, E, and β-carotene are believed to have a major role in these mechanisms acting as a cofactor of anti-oxidative system. On the basis that alcohol is one of the most common chemicals that induce oxidative damages in liver, this study was carried out to elucidate biochemical changes of blood after alcohol administration as well as to investigate the effects of β-carotene on the alcohol-injected Sprague-Dawley rats. The following results were obtained from this study. At first, the number of WBC after one week were lowest in the alcohol-treated group. But, β-carotene treatment by oral injection was shown to diminish the increasing rate of WBC in the alcohol-treated group. Second, RBC was increased all the time in all groups tested with alcohol and/or β-carotene. It is of interest that there was a sudden increase of RBC in the alcohol-treated group. Third, Hb was increased in the alcohol-treated groups on the second week. On the other hand, the groups of β-carotene treatment showed more higher rate of increase in Ht and MCV. It is of note worthy that these effects were maximized in the group of β-carotene treatment followed by diet with cheese for a week. Finally, alcohol had little or no effect on MCH and MCHC, although β-carotene showed atypical effects. These results made it clear that alcohol can cause damages in liver, resulting in inflammation and increase of RBC. Also β-carotene is believed to protect liver from oxidative effects by alcohol. In according to these results, it is suggested that diet of anti-oxidants such as Vt. A, B, C, E, and β-carotene is strongly recommended to prevent certain diseases caused by oxidative damages.

Carotenoids 식이와 알코올이 혈중 지질 성분에 미치는 영향에 관한 연구

조만희,조성호,김진국 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.1

Increasingly, humans are subjected to exposure to various foreign chemicals including drugs, food additives, pollutants. Some of them may be harmful and especially give rise to free radicals during metabolism in the tissues. These radicals such as superoxide, hydroxyl radical and hydrogen peroxide, induce oxidation of the macromolecules, resulting in a variety of damages in the body. However, humans have anti-oxidative mechanisms well developed against these damage. Anti-oxidants such as β-carotene and vitamin A, C, and E, are believed to play a major role in these mechanisms by acting as cofactors. On the basis that alcohol, among human's favorite foods, is one of the most common oxidative chemical, this study was carried out to elucidate biochemical changes in the lipid components of the blood after alcohol administration on Sprague-Dawley (SD) rats. Also, we investigated the effects of carotenoid and β-carotene diets on the alcohol-injected rats. At first, the concentrations of serum lipids were highly increased at alcohol-injected rats for one week (AL-1W), but significantly decreased at those dieted with β-carotene for one week (BC-1W). Second, after 2 weeks, the concentrations of serum lipids were exclusive decreased at alcohol-administrated rats. Third, the lipid concentration was increasing in β-carotene-dieted rats throughout the experiments for 3 weeks. These results may suggest that alcohol can cause damages in the liver, resulting in inflammation and increase of the concentration of serum lipids. Also, β-carotene and carotenoid diets are believed to protect the liver against the oxidative damages by alcohol administration.

Self-Leveling재의 최적 결합재비 산정을 위한 기초적 연구

김진만,조성현,조헌영,한기석,서정목 공주대학교 방재연구센터 1998 공주대학교 방재연구센터 논문집 Vol.2 No.-

Self-leveling material is the floor finishing material that is able to make surface level by itself, it can go on a next construction in a short time. Self-leveling materials are composed of various binders and chemical additions, and it is difficult to catch suitable mixing proportion of composion materials. This study is to investigate and analyze consistency and strength properties of according to component ratio of main materials and we endeavor to get suitable mixing propertion of binders by experimental design and statistical analysis. The results of this study are showed that suitable mixing proportions of binders are OPC(Ordinary Portland Cement) 70~80%, AC(Alumina Cement) 5~10%, AG)Anhydrous Gypsum) 5~20%.