• 한국지능시스템학회:학술대회논문집
• /
• 한국퍼지및지능시스템학회 2005년도 추계학술대회 학술발표 논문집 제15권 제2호
• /
• pp.535-541
• /
• 2005

It has been suggested that the endoscopic color of intramucosal gastric carcinoma is correlated with mucosal vascularity within the carcinomatous tissue. The development of electronic endoscopy has made it possible to quantitatively measure the mucosal hemoglobin volume, using a hemoglobin index. The aim of this study was to make a software program to calculate the hemoglobin index (IHb) and then investigate whether the mucosal IHb determined from the electronic endoscopic data is a useful marker for evaluating the color of intramucosal gastric carcinoma, in particular with regard to its value for discriminating between the histologic type. The mean values of IHb for the carcinoma (IHb-C) and the mean values of IHb for the surrounding non-cancerous mucosa ( IHb-N) were calculated in 75 intestinal-type and 34 diffuse-type gastric carcinomas. Then, we analyzed the ratio of the IHb-C to IHb-N. The mean IHb-C/IHb-N ratio in the intestinal-type carcinoma group was higher than that in the diffuse-type carcinoma group ($1.28{\pm}0.19$ vs. $0.81{\pm}0.18$, respectively, p<0.001). When the cut-off point of the C/N ratio was set at 1.00, the accuracy rate, the sensitivity, the specificity, and the positive and negative predictive values of a C/N ratio below 1.00 for the differential diagnosis of diffuse-type carcinoma from intestinal-type carcinoma were $94.5\%$, $94.1\%$, $94.7\%$, $88.9\%$ and $97.3\%$, respectively. IHb is useful for quantitative measurement of the endoscopic color in intramucosal gastric carcinoma and the IHb-C/IHb-N ratio would be helpful in distinguishing diffuse-type carcinoma from intestinal -type carcinoma.

• 대한약침학회지
• /
• 제8권3호
• /
• pp.5-9
• /
• 2005

미분간섭현미경법과 아크리딘-오렌지(acridine-orange) 형광 염색을 이용하여 쥐 혈관 내의 실 모양 구조물을 관찰하였다. 공초점현미경법과 헤마톡실린-에오신(hematoxylin-eosin) 염색을 통해 피브린, 모세혈관, 소정맥, 소동맥 혹은 림프관의 핵 분포와 뚜렷이 구별되는 혈관 내 실 모양 구조물의 핵 분포 패턴을 얻어낼 수 있었다. 이 실 모양 구조물의 생리적 기능을 침술과 연관하여 논의하였다. 특히, 이 실 모양 관을 통한 약물의 흐름이 약침의 기전에 해당할 것이라는 가설을 제기하였다.

• 한국항행학회논문지
• /
• 제15권5호
• /
• pp.833-838
• /
• 2011

진단용 X선 기기는 다양한 장치의 개발에 힘입어 보다 효과적이고 정밀한 진단이 가능하게 되었다. 정밀 진단이 가능하게 되면서 X선 기기는 임상의학에 있어 가장 기본적이고 핵심적인 진단 장치로 자리 잡고 있다. X선을 이용한 영상획득 분야에서는 영상의 획득 시간 단축과 전송이 용이하고, 조사선량의 감소가 가능한 DR(Digital Radiography)의 사용이 확대되고 있다. 하지만 DR은 1개의 디텍터를 이용하는 구조로 되어있어 기존의 X선 장치와는 달리 구조적인 변경이 필요하며 촬영위치에 따라 디텍터를 원하는 위치까지 움직여야하는 단점을 가진다. 따라서 본 연구에서는 BLDC 모터와 PID 제어방식을 사용해 DR에서 가장 움직임이 많은 디텍터의 상하, 좌우, 회전의 3축 위치자동 제어 시스템을 설계 제작하고 그 성능을 평가 하였다.

• 정보처리학회논문지B
• /
• 제10B권4호
• /
• pp.397-402
• /
• 2003

본 연구에서는 뉴우턴법의 고정점 알고리즘에 적응 조정이 가능한 학습 파라미터를 이용한 효율적인 신경망 기반 독립성분분석기법을 제안하였다. 이는 엔트로피 최적화 함수의 1차 미분을 이용하는 뉴우턴법의 고정점 알고리즘에서 학습율과 모멘트를 역혼합행렬의 경신 상태에 따나 적응조정되도록 함으로써 분리속도와 분리성능을 개선시키기 위함이다 제안된 기법을 256$\times$256 픽셀의 8개 지문과 512$\times$512 픽셀의 10개 영상으로부터 임의의 혼합행렬에 따라 발생되는 지문과 영상의 분리에 적용한 결과, 기존의 고정점 알고리즘에 의한 결과보다 우수한 분리성능과 빠른 분리속도가 있음을 확인하였다. 특히 제안된 알고리즘은 문제의 규모가 클수록 분리성능과 분리속도의 개선 정도가 큼을 확인하였다.

• 대한기계학회논문집B
• /
• 제23권9호
• /
• pp.1151-1162
• /
• 1999

The effects of radial heat and $H_2O$ diffusion on the evolution of silica particles in coflow diffusion flames have been studied experimentally. The evolution of silica aggregate particles in coflow diffusion flames has been measured experimentally using light scattering and thermophoretic sampling techniques. The measurements of scattering cross section from $90^{\circ}$ light scattering have been utilized to calculate the aggregate number density and volume fraction using with combination of measuring the particle size and morphology through the localized sampling and a TEM image analysis. Aggregate or particle number densities and volume fractions were calculated using Rayleigh-Debye-Gans and Mie theory for fractal aggregates and spherical particles, respectively. Flame temperatures and volumetric differential scattering cross sections have been measured for different flame conditions such as inert gas species, $H_2$ flow rates, and burner injection configurations to examine the relation between the formation of particles and radial $H_2O$ diffusion. The comparisons of oxidation and flame hydrolysis have also been made for various $H_2$ flow rates using $N_2$ or $O_2$ as a carrier gas. Results indicate that the role of oxidation becomes dominant as both carrier gas($O_2$) and $H_2$ flow rates increases since the radial heat diffusion precedes $H_2O$ diffusion in coflow flames used in this study. The effect of carrier gas flow rates on the evolution of silica particles have also been studied. When using $N_2$ as a carrier gas, the particle volume fraction has a maximum at a certain carrier gas flow rate and as the flow rate is further increased, the hydrolysis reaction Is delayed and the spherical particles finally evolves into fractal aggregates due to decreased flame temperature and residence time.

• Reproductive and Developmental Biology
• /
• 제29권2호
• /
• pp.63-68
• /
• 2005

Cloned calves derived from somatic cell nuclear transfer (SCNT) have been frequently lost by sudden death at 1 to 3 month following healthy birth. To address whether placental anomalies are responsible for the sudden death of cloned calves, we compared protein patterns of 2 placentae derived from SCNT of Korean Native calves died suddenly at two months after birth and those of 2 normal placentae obtained from AI fetuses. Placental proteins were separated using 2-Dimensional gel electrophoresis. Approximately 800 spots were detected in placental 2-D gel stained with coomassie-blue. Then, image analysis of Malanie III (Swiss Institute for Bioinformatics) was performed to detect variations in protein spots between normal and SCNT placentae. In the comparison of normal and SCNT samples, 8 spots were identified to be up-regulated proteins and 24 spots to be down-regulated proteins in SCNT placentae, among which proteins were high mobility group protein HMG1, apolipoprotein A-1 precursor, bactenecin 1, tropomyosin beta chain, $H^+-transporting$ ATPase, carbonic anhydrase II, peroxiredoxin 2, tyrosine-rich acidic matrix protein, serum albumin precursor and cathepsin D. These results suggested that the sudden death of cloned calves might be related to abnormal protein expression in placenta.

• 한국지역지리학회지
• /
• 제10권1호
• /
• pp.132-150
• /
• 2004

지역의 문화적 특성에 따라서 중원문화권은 충주문화권, 청주문화권, 점이문화권 등의 3대 문화권으로 구분하고 이것을 다시 10개의 아문화권으로 구분할 수 있다. 충청북도 지방자치단체에서는 이러한 아문화권의 문화적 특성을 상징하고 있는 다음과 같은 핵심적인 상징적 문화재의 이미지를 강화하는 문화재를 집중적으로 개발하는 전략으로 특화된 새로운 지역문화를 창출할 수 있다: (1) 충주권: 역사 문화권(탑평리 7층 석탑), (2) 제천권: 의병문화권(의병장 유인석), (3) 단양권: 고구려 문화권(온달산성), (4) 청주권: 교육 문화권(직지와 철당간), (5) 보은권. 불교문화권(속리산 법주사), (6) 옥천권: 나제문화권(나제전투), (7) 영동권: 삼도통합 문화권(삼도봉의 삼도 대화합비), (8) 음성권: 선비정신 문화권(무극 6.25 사변 전적비), (9) 괴산권: 유교문화권(우암 송시열, (10) 진천권: 삼국통일 정신문화권(김유신 장군).

• 농촌계획
• /
• 제5권1호
• /
• pp.35-44
• /
• 1999

The purpose of this study is to find the bi-polar adjectives for rural stream landscape evaluation by the semantic differential scale and to suggest the major determinants of visual preference in rural stream landscapes. For this, the bi-polar adjectives for rural stream landscape evaluation was found by the method of the reliability test, and the spatial image was analyzed by the factor analysis. The level of visual preference was measured by slide simulation test, and these data were analyzed by the multiple regression. The major findings of this study can be summarized as follows : 1) Of the bi-polar adjectives expressing psychological and physical characteristics, the hi-polar adjectives which demonstrated reliability and consistency run as follows : Bi-polar adjectives expressing psychological characteristics : 'calm-bustling', 'unfamiliar-familiar', 'still-active','depressing-brisk', 'discomfortable-comfortable', 'suppressed-free', 'lifeless-living', 'quiet-noisy', 'unpleasant-pleasant'. Bi-polar adjectives expressing physical characteristics : 'artificial-natural', 'narrow-wide', 'rocky-not rocky', 'desolate-fertile', 'dirty-clean', 'enclosed-open', 'flat-steep', 'not gravelly-gravelly', 'thicketed-not thicketed', 'not weedy-weedy'. 2) Two factors, the harmony and the movement, were derived from the factor analysis for the psychological variables. Three factors, the naturalness, the rock, and the vegetation, were derived from the factor analysis for the physical variables. 3) Rural stream landscape types were classified into four types by the multi-dimensional scaling method. Type III, IV obtained higher rank of visual preference and type I, II obtained lower. 4) For all types, the factors determining the level of visual preference were found to be the harmony, the naturalness, and the vegetation. The visual preference determinants of rural stream landscape need to be considered in improving or restoring the rural stream landscapes.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
• /
• pp.236-238
• /
• 2006

An algorithm for detection of yellow sand aerosols has been developed with infrared bands from Moderate Resolution Imaging Spectroradiometer (MODIS) and Multi-functional Transport Satellite-1 Replacement (MTSAT-1R) data. The algorithm is the hybrid algorithm that has used two methods combined together. The first method used the differential absorption in brightness temperature difference between $11{\mu}m$ and $12{\mu}m$ (BTD1). The radiation at 11 ${\mu}m$ is absorbed more than at 12 ${\mu}m$ when yellow sand is loaded in the atmosphere, whereas it will be the other way around when cloud is present. The second method uses the brightness temperature difference between $3.7{\mu}m$ and $11{\mu}m$ (BTD2). The technique would be most sensitive to dust loading during the day when the BTD2 is enhanced by reflection of $3.7{\mu}m$ solar radiation. We have applied the three methods to MTSAT-1R for derivation of the yellow sand dust and in conjunction with the Principle Component Analysis (PCA), a form of eigenvector statistical analysis. As produced Principle Component Image (PCI) through the PCA is the correlation between BTD1 and BTD2, errors of about 10% that have a low correlation are eliminated for aerosol detection. For the region of aerosol detection, aerosol index (AI) is produced to the scale of BTD1 and BTD2 values over land and ocean respectively. AI shows better results for yellow sand detection in comparison with the results from individual method. The comparison between AI and OMI aerosol index (AI) shows remarkable good correlations during daytime and relatively good correlations over the land.

• 한국광학회지
• /
• 제13권3호
• /
• pp.251-257
• /
• 2002

고속 정밀 파면측정 기술은 적응광학 시스템의 성능향상에 중요한 요소이다. 본 논문에서는 적응광학시스템의 하트만 센서로부터 파면정보를 고속으로 측정할 수 있는 알고리즘을 제안하였다. 또한 변형거울 및 기울기거울을 외부유입 노이즈에 강하게 제어하기 위하여 차분 신호를 구성하는 전기적인 제어 장치들을 개발하였다. 무게중심법에 기초한 파면측정 기술은 하트만 센서를 이용한 파면측정 알고리즘으로 가장 널리 사용 되어오고 있으며 좋은 측정결과를 제공해오고 있다. 본 논문에서는 하트만 센서를 이용한 점 영상에서 실제 각 점의 무게 중심위치를 예측하는 예측 가중치가 결합된 무게중심 법을 제안하였다. 제안된 고속 파면측정 알고리즘은 실험을 통해 고속의 정밀한 측정 결과를 제공함을 확인하였고 결과를 비교 분석하였다.