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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.
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.
RDB 에서의 검색 효율을 위한 XML 문서 저장 모델
권훈,강인석,김정희,곽호영 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.2
The purpose of the paper is design and implementation of Internet-Based Real-Time Admission XML instances for purpose of information exchange are normally stored in the legacy relational database. therefore, integrations with relational database are required for effective XML applications. to support these requirements, virtual decomposition storage or decomposition storage methods which save separates structures of instances to relational database have researched. however, these storage methods contain different information of instance structure and layers which has caused difficulties to process query during search operation as well as increased overheads due to duplicate savings for separate storages. therefore, in this research, additional field of "Eltype" has introduced to previous database schema structure to integrate instance and instance structure, provide .consistent information of layers and propose storage structure to map each field to schema field of relational database. as results, XML instance and structures can be stored together to minimize overheads and required disk space. also, synchronized storage layer structure provides easier processing of search query.
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.
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.
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)