인공 치아우식 발생 모델에서 디지털 방사선 공제술을 이용한 인접면 치아우식증의 진단

박정훈,최용석,황의환,이기자,최삼진,박영호,김경숙,진현석,홍경원,오범석,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Purpose : The purpose of the experiment was to evaluating the diagnostic ability of dental caries detection using digital subtraction in the artificial caries activity model. Materials and Methods : Digital radiographies of five teeth with 8 proximal surfaces were obtained by CCD sensor (Kodak RVG 6100 using a size #2). The digital radiographic images and subtraction images from artificial proximal caries were examined and interpreted. In this study, we proposed novel caries detection method which could diagnose the dental proximal caries from single digital radiographic image. Results : In artificial caries activity model, the range of lesional depth was 572-1,374 μm and the range of lesional area was 36.95-138.52mm². The lesional depth and the area were significantly increased with demineralization time (p<0.001). Furthermore, the proximal caries detection using digital subtraction radiography showed high detection rate compared to the proximal caries examination using simple digital radiograph. Conclusion : The results demonstrated that the digital subtraction radiography from single radiographic image of artificial caries was highly efficient in the detection of dental caries compared to the data from simple digital radiograph.

슬관절 골관절염 증상이 환자에게 미치는 우울 효과

박영규,이윤영,이계우,김정아,윤도경,박승회,조경환,홍명호,박용규 대한노인병학회 2001 대한노인병학회지 Vol.5 No.4

방사선사진의 인덱스-순서 분석을 통한 치아경조직의 탈염화 검출

박동현,박영호,김경숙,박정훈,이기자,최삼진,최용석,황의환,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.2

Purpose : The purpose of this study was to develop the radiographic technique for detecting the demineralization which is known as indication of dental caries. Materials and Methods : This technique was based on the comparing of multiple radiographs which was irradiated by multiple X-ray spectra. For the meaningful comparing, the multiple radiographs were reconstructed to the dosimetrically consistent images using a standard material. The difference of resulting images of same target with multiple spectra represents the difference of response of material as regards the spectra. Results : We have found about 10% of demineralization of dental hard tissues particularly in the proximal region through the analyzing of differences. Conclusion : Most intriguing thing in this investigation was that the method to analyze difference shows us to an anatomic structure of dental hard tissues even if absolute values of optical density were excluded during the procedures.

국소 광적응 기능을 가지는 윤곽검출용 32×32 방사형 CMOS 시각칩의 설계 및 제조

박대식,박종호,김경문,이수경,김현수,김정환,이민호,신장규 한국센서학회 2002 센서학회지 Vol.11 No.2

국소 광적응 기능을 가지는 윤곽검출용 시각칩을 픽셀수 32x32의 방사형 구조로 CMOS 공정기술을 이용하여 설계 및 제조하였다. 생체의 망막은 넓은 범위의 입력 광강도에 대해서 물체의 윤곽을 검출할 수 있다. 본 연구에서는 시세포, 수평세포, 쌍극세포로 이루어진 망막의 윤곽검출 기능을 모델링하여 윤곽검출용 인공시각칩을 설계하였다. 국소 광적응을 위해, 입력 광강도에 따라 수용야의 크기를 국소적으로 바뀌게 하였다. 아울러 단위셀을 방사형으로 배치함으로써 영상데이터의 양을 감소시킴과 동시에 칩의 중심부분으로 갈수록 해상도가 높아지도록 설계하였다. 설계된 칩은 0.6 ㎛ double-poly triple-metal 표준 CMOS 공정기술을 이용하여 제조되었으며. HSPICE 시뮬레이션으로 성능을 최적화 시켰다. A 32x32 pixels foveated (linear-polar) stucture retina chip with the function of local-light adaptation for edge detection has been designed and fabricated using CMOS technology. Human retina can detect a wide range of light intensity. In this study, we use the biologically-inspired visual signal processing mechanism that consists of photoreceptors, horizontal cells, and bipolar cells in order to implement the function of edge detection in the retina chip. For a local-light adaptive function, the size of receptive field is changed locally according to the input light intensity. The spatial distribution of sensing pixels in the foveated retina chip has the advantages of selective reduction of image data and good resolution in central part to carry out the elaborate image processing with still enough resolution in the outer parts. The designed chip has been fabricated using standard 0.6 ㎛ double-poly triple-metal CMOS technology and optimized using HSPICE simulator.

Accuracy on the Edge Detection of Topography for Digital Map Manufacture

Park, Woon-Yong,Song, Youn-Kyung,Bae, Kyung-Ho,Kim, Yong-Suk 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.28 No.2

Currently, digital maps in the metropolitan area are supposed to be revised and renewed every two years, but it is difficulty for the renewal of current information to keep pace with the quickly changing society and so, one of the alternative methods being discussed is a digital map produced using high resolution satellites. The biggest problem in the production of digital maps using high resolution satellite images is the difficulty of production in vector resource format through edge detection of satellite images, a Raster data. In this study, topographical boundaries were detected through edge detection of the satellite image, and after vectorliezing using the screen digitizing method, the results were evaluated and compared to the digital map from the NGII(National Geographic Information Institute) for accuracy.

급성 뇌경색 환자에서 경색 위치가 심근 효소치 상승에 미치는 영향

윤경호,박현영,박성욱,장혁,김요식,조광호,유남진,김남호,오석규,정진원 圓光大學校 醫科學硏究所 2003 圓光醫科學 Vol.18 No.2

3차원 전산화단층촬영 영상을 이용한 안면 연조직 두께 계측의 임상적 유용성

정호걸,김기덕,한승호,허경석,이제범,박혁,최성호,김종관,박창서 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.2

Purpose : To evaluate clinical usefulness of facial soft tissue thickness measurement using 3D computed tomographic images. Materials and Methods : One cadaver that had sound facial soft tissues was chosen for the study. The cadaver was scanned with a Helical CT under following scanning protocols about slice thickness and table speed; 3 mm and 3 mm/sec, 5 mm and 5 mm/sec, 7 mm and 7 mm/sec. The acquired data were reconstructed 1.5, 2.5, 3.5 mm reconstruction interval respectively and the images were transferred to a personal computer. Using a program developed to measure facial soft tissue thickness in 3D image, the facial soft tissue thickness was measured. After the ten-time repeation of the measurement for ten times, repeated measure analysis of variance (ANOVA) was adopted to compare and analyze the measurements using the three scanning protocols. Comparison according to the areas was analyzed by Mann-Whitney test. Results : There were no statistically significant intraobserver differences in the measurements of the facial soft tissue thickness using the three scanning protocols (p>0.05). There were no statistically significant differences between measurements in the 3 mm slice thickness and those in the 5 mm, 7 mm slice thickness (p>0.05). There were statistical differences in the 14 of the total 30 measured points in the 5 mm slice thickness and 22 in the 7mm slice thickness. Conclusion : The facial soft tissue thickness measurement using 3D images of 7 mm slice thickness is acceptable clinically, but those of 5 mm slice thickness is recommended for the more accurate measurement.

공무원들의 인식에 나타난 경관자원 특성 분석 연구

박선명(Park Sun-Myung),박선경(Park Sun-Kyung),김주현(Kim Joo-Hyun),김종하(Kim Jong-Ha),이정호(Lee Jung-Ho),최무혁(Choi Moo-Hyuck) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.11

In this study, to set up landscaping plans, characteristics of landscape were extracted based on opportunity and weaknesses factors of landscape after carrying out a questionnaire targeting officers in 23 cities and counties in Kyung-buk province and the findings are as following. First, in analyzing condition, component and value of landscape based on opportunity and weaknesses factors, for opportunity factors, it was found that the condition of landscape was quantitatively great, the component of landscape was industrially great and the value of landscape was great in possibility of development. Also, for weaknesses factors, the 'quality' was superior in its condition, the industry was superior in its 'component' and the shortage of artificial resources was superior in its 'value'. Secondly, in the relation between factors consisting opportunity and weaknesses resources, firstly, it was found that industry, city and nature are superior for opportunity factors, and culture, traffic and population are superior for weaknesses factors. Next, in the relation between component and condition, 'qualitatively superior industry' and 'quantitatively superior industry' had the highest frequencies in opportunity factors and 'qualitatively outstanding city' and 'quantitatively preponderant industry' had the highest frequencies in weaknesses factors. Thirdly, in analyzing the importance of opportunity and weaknesses factors, for opportunity factors, qualitatively superior resource was a priority in the importance of condition and for weaknesses factors, it was qualitatively little greater than the quantity. In the importance of component, the industry was most superior in both of strength and weak points and in the importance of value, the shortage of artificial resources was a priority. Fourthly, in characteristics of landscape, internal characteristics were found stronger than external characteristics in each city and county. This means that there are more resources to strategize in landscape plans of individual city and county unit than other in metropolitan unit. Also, possibility of development, possession of complex resources and geographical adjoin were common points of their strategies and plans.

심근 허혈-재관류 백서 모델에서 mitogen-activated protein kinase 활성화에 대한 α-lipoic acid의 효과

김연경,박은미,최준호,윤경호,유남진,이은미,김남호,정진원,김민선,박병림,오석규 圓光大學校 醫科學硏究所 2006 圓光醫科學 Vol.21 No.1

Fluctuations in Abundance and Species Composition of Fishes that appear in the set net fishery in the Dadohae Marine National Park

Cheong, Hyun-Ho,Park, Kyung-Hee national science museum of korea 2009 Journal of Korean nature Vol.2 No.1

In a joint research of the Korean Biodiversity Information Facility (KBIF), the study analyzed species composition and fluctuations in abundance of fishes caught by the set net fishery installed in the offing of Impo, Dolsando in Yeosu-si, Jeollanamdo in June and September 2008. During the study period, there were 11,180 individuals of 54 species of 39 families in 8 orders that appeared in the set net fishery in the offing of the Dadohae Marine National Park. The numbers of individuals that appeared in June and September were shown in Table 2. Among the fishes caught, the Perciformes was the dominant species with 29 species of 22 families followed by the Tetraodontiformes with 6 species of 2 families and the Pleuronectiforme with 5 species of 4 families. There appeared 3 species of 3 families of the Anguilliformes and the Beloniformes, respectively. There were 4 species of 2 families of the Clupeiformes and 3 species of 2 families of the Scorpaeniformes. There was 1 species of 1 family of the Aulopiformes. During the study period, Scomber japonicus was the dominant species with 9005 individuals followed by Trichiurus lepturus with 1500 individuals and Panpus argenteus with 184 individuals. In June, Trichiurus lepturus was dominant with 1200 individuals followed by Panpus argenteus with 150 individuals and Scomberomorus koreanus with 58 individuals. In October, Scomber japonicus was the dominant species with 9000 individuals followed by Trichiurus lepturus with 300 individuals and Scomberomorus koreanus with 45 individuals. It indicates that the dominance of a species has close relationship with water temperature because fishes migrate to feed in this season. Given the frequency of appearance, Scomber japonicus and Trichiurus lepturus most frequently appeared because they were in the middle of growing into adult fishes while the frequent appearance of Scomberomorus koreanus and Panpus argenteus, which were major species of the fishing industry, contributed to the income of fishermen. There appeared rarely seen species in the offing of Yeosu like Pelamis platurus, Rachycentron canadum (Linnaeus), Lobotes surinamensis, Kyphosus vaigiensis, Abudefduf vaigiensis and Siganus fuscescens (Houttuyn). They are subtropical fishes and seem to move here due to the warmer water affected by the global warming. Additional studies on species composition and fluctuations in abundance of fishes that appear in the set net fishery in the Dadohae Marine National Park will be continuously conducted. So, they will contribute to the increase of fishermen's income by transferring the new fish species to fishermen when newly developed rare fish species are fostered in the lab and evaluated for adaptability and growth potential. The research result will be used as basic data to secure national biological resources, and create/manage biodiversity data by building a biodiversity database network.