객체 추출 알고리즘을 이용한 내용기반검색

정석훈,강대성 東亞大學校附設情報技術硏究所 2005 情報技術硏究所論文誌 Vol.12 No.2

Recently there have been many efforts to support searching and browsing based on the visual content of image and multimedia data. Most existing approaches to content-based image retrieval rely on query by example or user based low-level features such as color, shape, texture. But these methods of query are not easy to use and restrict. In this paper we propose a method for automatic color object extraction of content-based image retrieval system. Theses approaches simplify the regions within images using similar colorizing algorithm and extract color object using proposed Color and Spatial based Binary tree map(CSB tree map). This allows very fast indexing of the image by color contents of the images and spatial attributes. Futhermore, information about the labelled regions, such as the color set, size, and location, enables variable multiple queries that combine both color content and spatial relationships of regions. We proved our proposed system to be high performance through experiment comparable with another algorithm using "Washington" image database.

ACE 객체 추출 알고리즘을 이용한 다중 멀티미디어 검색 시스템의 개발

정석훈,강대성 東亞大學校附設 情報技術硏究所 2005 情報技術硏究所論文誌 Vol.13 No.1

In this paper, We propose a user friendly object-based multimedia retrieval system using the HCNN(HippoCampus Neural Network). Most existing approaches to content~based retrieval rely on query by example or user based low-level features such as color, shape, texture. In this paper we perform a scene change detection and key frame extraction for the compressed video stream that is video compression standard such as MPEG. We propose a method for automatic color object extraction and ACE(Adaptive Circular filter and Edge detection) of content-based multimedia retrieval system. And we compose multimedia retrieval system after learned by the HCNN such extracted features. Proposed HCNN makes an adaptive real-time content-based multimedia retrieval system using excitatory learning method that forwards important features to long-term memories and inhibitory learning method that forwards unimportant features to short-term memories controlled by impression.

반발경도법에 의한 혼화재 및 섬유사용 콘크리트의 압축강도 추정

김정섭,신용석,노성열,김정훈 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.2

This study aims to estimate strength approximate to actual concrete strength by presenting appropriate rebound method strength estimation expression with admixtures (fly ash, blast furnace slag, silica fume) which are used as cement substitute and polypropylene fiber and steel fiber and owing to their s of cement owing to their equal conditions to blending characteristics of concrete used for domestic structures and their recyclable properties. In case of rebound hammering, equation by Japanese Architecture Society was estimated 26~40% higher than destructive strength and remaining suggested equation was estimated 2%~18% lower. In case of ultrasound velocity, equation by Japanese Architecture Society was estimated 4%~11% higher than destructive strength till 60 days of age, but as age progresses, is estimated to 15% lower than destructive strength and remaining suggested equation was estimated 3%~27% lower than destructive strength in almost age. In case of complex methods, all suggested equations were estimated to 24%~94% higher than destructive strength. Since application of existing expression of normal concrete against concrete using admixtures and fiber causes error rate, this study suggests the following estimation expression depending on the kind of admixtures and fiber of concrete using them and position of non-destructive experiment. C-N f_(cu)=1.6R-25.43(R²=0.90), C-FA f_(cu) = 1.07R-8.76 (R²=0.82), C-BF f_(cu)=1.46R-23.09(R²=0.92) C-SF f_(cu) = 1.55R-22.96(R²=0.89), C-PP f_(cu) = 1.16R-12.24(R²=0.73), C-S f_(cu)=0.99R-8.07(R²=0.86)

정상 혈압쥐와 본태성 고혈압쥐 노화 적혈수에서의 Na, K-ATPase에 관한 연구

정성훈,박창길,허강민,석정호,이재흔 충남대학교 의과대학 지역사회의학연구소 1992 충남의대잡지 Vol.19 No.1

To study the change of Na, K-ATPase of aged erythrocytes in the normotensive and hypertensive rats, the young and aged erythrocytes of Sprague-Dawley rats or spontaneously hypertensive rats were fractionized by density gradient, and ouabain sensitive Rb-uptake and [^3H] ouabain binding sites were measured. 1. In the spontaneously hypertensive rats, blood pressure was significantly increased to 151.5/110.0mmHg(systolic/diastolic). Mean corpuscular volume and membrane protein(mg/10^9 RBC) were decreased and hemoglobin content was increased in the aged erythrocytes. 2. In the normotensive rats, ouabain sensitive Rb-uptake of young erythrocyte was increased as increase of Rb concentration from 4 mM to 8 or 16 mM in the reaction medium, but that of aged erythrocyte was lower than that of young erythrocyte. 3. In the spontaneously hypertensive rats, ouabain sensitive Rb-uptake of young erythrocyte was also increased as increase of Rb concentration in the medium, but lower than that of young erythrocyte of normotensive rats, and that of aged erythrocyte was also decreased compared to that of young erythrocyte and that of aged erythrougte of normotensive ratc. 4. [^3H] ouabain binding sites of aged erythrocyte of normotensive rats and young or aged erythrocyte of spontaneously hypertensive rats were lower than that of young erythrocyte of normotensive rats. From the above results, it is suggested that the decreased activity of Na, K-ATPase in the aged erythrocyte of normotensive and spontaneously hypertensive rats may due to the decreased numbers of enzymes, and these enzymes in the erythrocytes of spontaneously hypertensive rats would changed from the younger erythrocytes than those of normotensive rats or one-kidney Goldblatt hypertensive rats.

교실영어 활용을 통한 영어과 교수-학습 방법에 관한 연구

유정숙,Busbee, E.,김미영,이복자,최종훈,한일석 전주대학교 교육문제연구소 2000 敎育論叢 Vol.15 No.-

Mo 화학기상증착에 있어서 불순물 농도에 미치는 증착조건의 영향

배상석,서성교,홍은식,김승모,조미정,한혜정,이두성,김세훈,민석홍 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-

The thermal decomposition process of Mo(CO)_6 on chemical vapor deposition was investigated by analyzing the effects of deposition temperature, pressure, and reaction gas on the phase change of deposited films. Mo_2C was deposited at or below 350℃ due to the incompleteness of thermal decomposition of Mo(CO)_6, but Mo films was successfully deposited at 400℃ or higher temperatures. The variation of deposition pressure did not change the dependence of decomposition process on deposition temperature. The activation energy of surface reaction was 5.8 ㎉/mole.

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.

다형홍반, 스티븐스-존슨 증후군, 독성 표피 괴사 융해증의 임상 및 조직 소견에 대한 후향적 연구 : A retrospective clinico-histopathologic study

차승훈,정상원,박석돈 圓光大學校 醫科學硏究所 1999 圓光醫科學 Vol.15 No.1

Background: Erythema multiforme (EM) is an acute self-limited disease with distinctive skin lesion. Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) has been regarded as variants of EM within continuous spectrum. The reports that EM with mucous membrane involvement and SJS are clinically different disorders prompt us to investigate the relationship between clinical features and causative factors of these dermatoses. Methods: A retrospective clinico-histopathologic study was performed in 59 patients from 1988 to 1996. Results: While most of EM patients showed typical target, raised atypical target, or flat atypical target, purpura with or without blistering was noted in 80% of SJS patients and all of TEN patients. In EM patients, the skin eruption was mainly located acrally or centrally, diffuse involvement was observed in all of TEN patient. The involved skin surface area was wider in SJS and TEN than EM. Through the review of histopathologic slides, we found that 74% (17/23) was inflammatory type which was diagnosed as EM in 76% patients. Drug was the most common causative factor (41%), and there were the clinical evidences of recurrent herpes simplex virus infection in 12% (7/59) patients. Conclusion: We conclude that there is no difference in clinical features of EM, SJS, and TEN compared with reported studies. A detailed and precise prospective study is necessary to elucidate the clinical features and etiology of these unique dermatoses.

Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

Young‑Seok Oh,Ho Won Lee,Kook‑Chae Chung,Duck‑Young Hwang,Seong‑Hoon Kang,Jeong Whan Yoon 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7

Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawingprocesses for multi-filamentary MgB2wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface usingthe new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effectof the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxialcompression tests were conducted using different powder densities to characterize the modified DPC model. A commercialfinite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB2wire. The densityand area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The differencein packing density at the inner and outer filaments of the MgB2wire was successfully captured by simulation. Inaddition, the effect of the initial packing density on the superconducting properties of MgB2wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be moreeffective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB2wirewhen the final packing density is saturated after a number of drawing processes.

분자역학적 방법을 이용한 부산시내 대형건물 냉각탑수의 레지오넬라균의 형별 분류

김정만,정석훈,서대영,박은희,송은주,최재철,이은엽,장철훈 대한임상미샐물학회 2004 Annals of clinical microbiology Vol.7 No.1