대용량 텍스트 데이터베이스를 위한 효율적인 2단계 합성 요약 화일 방법

유재수(Yoo Jae Soo),강형일(Kang Hyung Il) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.4

In this paper, we propose a two-level hybrid signature file method(THM) to efficiently deal with large text database that use a term discrimination concept. In addition, we apply Yoo's clustering scheme to the two-level hybrid signature file method. The clustering scheme groups similar signatures together according to the similarity of the highly discriminatory terms so that we may achieve better performance on retrieval. The space-time analytical model of the proposed two-level hybrid method is provided. Based on the analytical model and experiments, we compare it with the existing methods, i.e., the bit-sliced method(BM), the two-level method(TM), and the hybrid method(HM). As a result, we show that THM achieves the best retrieval performance in a large database with 100,000 records when the number of matching records is less than 160.

Poly(ρ-phenylenesulfide)와 Poly(ρ-phenylene)으로부터 제조된 탄소의 리튬 이온 2차전지 anode 재료로서의 전기화학적 특성

유덕영,이주성,박수길,변지형,류신환,정윤이 한양대학교 에너지·환경기술연구소 1998 에너지·環境技術論文集 Vol.4 No.-

Poly(p-phenylenesulfide)와 poly(p-phenylene)으로부터 제조된 탄소를 리튬이온 2차전지용 음극재료로 사용하여 전기화학적특성을 연구하였다. 이들 고분자들을 질소 분위기하에서 승온속도 2℃/min로 1000℃까지 상승시킨 후, 1시간 동안 탄화시켜 탄소를 제조하였다. Poly(p-phenylene)으로부터 제조된 탄소가 보다 더 규칙적인 구조를 가지기 때문에 Poly(p-phenylenesulfide)으로부터 제조된 탄소보다 더 많은 용량과 충방전 효율을 나타내었다. 수산화리튬과 염화주석(Ⅱ)을 첨가하여 용량의 증가와 충방전 효율의 증가를 가져올 수 있었다. 이중에서 poly(p-phenylene)에 염화주석(Ⅱ)을 첨가시켜 제조된 탄소가 가장 큰 충방전 용량과 충방전 효율의 향상을 가져왔다. Carbon inaterials manufactured from poly(p-phenylene sulfide) and poly(p-phenylene), were studied on electrochemical characteristics as anode materials for lithium ion secondary battery. These polymer precursors were heat treated for 1hr at 1000℃ with the rate 2℃/min under nitrogen atmosphere. Carbon manufactured from poly(p-phenylene) showed higher capacity and coulomb efficiency of charge/discharge than carbon from poly(p-phenylene sulfide) because the former has better ordered structure. Carbon manufactured from polymer precursors adding stannous chloride or lithium hydroxide showed higher capacity and better efficiency of charge/discharge. Also, carbon manufactured by adding stannous chloride to poly(p-phenylene) showed the highest capacity and efficiency of charge/discharge.

치아 우식증의 조기 진단을 위한 QLF-D 개발

박형주,김종수,유승훈,신지선 大韓小兒齒科學會 2011 大韓小兒齒科學會誌 Vol.38 No.4

QLF-D system composed with DSLR(digital single-lens reflex) camera, and the images of natural enamel caries and artificial caries was developed from 2 days to 14 days captured by QLF-D system. The correlation between lesion depth of the polarized microscope and luminosity ratio of QLF-D image was analyzed and the results were summarized as follows: 1. The Pearson correlation value between the lesion depth of polarized microscope images and luminosity ratio of QLF-D images was 0.969(p<0.01). 2. From Regression analysis of lesion depth from polarized image by demineralized period, the equation was y = 8.67x - 1.16(p<0.05). 3. From Regression analysis of luminosity ratio from QLF-D image by demineralized period, the equation was y = 3.53x + 6.42(p<0.05). From the results, QLF-D system can detect the enamel caries at the very early stage and can monitor the progression of demineralization and remineralization. For the convenient use of QLF-D system in the laboratory, the image analysing software was needed to analyze of interest site of enamel caries lesion. 저자는 DSLR(digital single-lens reflex) 카메라를 이용한 QLF-D 시스템을 고안하여, 사람의 유구치에 자연 발생된 법 랑질 초기 우식증을 관찰하고, 유구치 법랑질 시편을 대상으로 2일부터 14일까지 인공 탈회시킨 후 탈회 기간에 따른 상관관 계를 편광 현미경 소견과 비교 분석한 결과 다음과 같은 결과를 얻었다. 1. 탈회 기간에 따른 편광 현미경 상의 병소 깊이와 QLF-D 영상의 광밀도 값 비율 간의 피어슨 상관 계수는 0.969였다 (p<0.01). 2. 편광현미경에서 측정된 병소 깊이의 탈회 기간에 대한 회귀분석 결과 y=8.67x-1.16의 회귀 방정식이 산출되었다 (p<0.05). 3. QLF-D 영상에서 측정된 광도값 비율의 탈회 기간에 대한 회귀분석 결과 y=3.53x+6.42의 회귀 방정식이 산출되었다 (p<0.05).

간척지 호소군의 동물플랑크톤 군집 비교

유형빈,김광수 원광대학교 환경과학연구소 1998 環境科學硏究誌 Vol.7 No.1

개에서 발생한 신우신염 증례

유건우,이선희,임수정,박형진,김태신,송은식,송근호 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2009 動物醫科學硏究誌 Vol.16 No.1

A 6 years old Schunauzer dog (7.2kg, intact female) with history of hematuria for two days was referred to the Veterinary Medical Teaching Hospital of Chungnam National University. Complete blood cell count showed no significant abnormalities and serum chemistry profile showed increased phosphate profile. On urinanalysis, there was evidence of bacterial infection. On ultrasonographic evaluation, irregular renal contour and increased echogenecity, pelvic and uretral dilation, and thickening of urinary bladder wall were observed. Based on these finding, the dog was diagnosed as pyelonephritis. The dog was treated with antibiotics based on antimicrobial susceptibility test results, then successfully resolved after 8 weeks of treatment.

HTML-WML 변환기 설계

강형일,유재수 충북대학교 컴퓨터정보통신 연구소 2000 컴퓨터정보통신연구 Vol.8 No.2

최근 휴대용 무선 단말기를 사용하여 웹 상의 다양한 정보를 취득하고자 하는 요구가 증가하고 있으며, 작은 메모리, 느린 CPU 속도, 불아정한 통신상태 등을 지원하는 무선 단말기 때문에 기존의 HTML 문서 변환 시 꼭 필요한 정보만이 전달되어져야 한다. 본 논문에서는 HTML 문서 분석을 통해 불필요한 정보를 제거하고 필요한 정보만을 추출하는 방법과 이를 WML 문서로 변환할 수 있는 방법을 제안한다. Recently, wireless terminal users that want to gain various information from www have been increased rapidly. Since wireless terminals have a cpu with low speed, small memory and unstable communication status, existing HTML documents must be converted to extremely dieted documents that contain only necessary information to convey the origin meaning. In this paper, we propose a HTML-WML Translator that eliminates needless information from existing HTML documents and converts them to WML(wireless Markup Language) documents efficiently.

XML 문서를 위한 효율적인 인덱싱 모델

강형일,박종관,유재수 충북대학교 컴퓨터정보통신 연구소 2000 컴퓨터정보통신연구 Vol.8 No.2

본 논문에서는 문서 계층상의 모든 레벨에서 내용 기반 질의와 구조 및 애트리뷰트 질의와 같은 다양한 질의를 지원하기 위해 구조정보를 제안한다. 구조정보는 EID(Element Id), ETID(Element Type Id), SORD(Sibling ORDer), SSORD(Same Sibling ORDer)로 구성된다. EID는 DTD의 각 엘레먼트에 할당되는 유일한 값이며 ETID는 부모 노드와 자식 노드들 간의 계층정보이다. SORD와 SSORD는 각각 형제 노드들 간의 순서정보와 동일 엘리먼트의 형제 노드들 간의 순서정보이다. 이런 구조정보를 이용해 효율적인 검색을 위한 내용 색인, 구조 색인, 애트리뷰트 색인을 설계한다. 또한 내용 질의, 구조 질의, 애트리뷰트 질의, 혼합 질의와 같은 다양한 질의를 지원함을 보인다. In this paper, we propose structured information to support a wide range of queries such as content-based queries and structure-attribute queries at all levels of the document hierarchy. Structured information consists of EID(Element Id), ETID(Element Type Id), SORD(Sibling ORDer) and SSORD(Same Sibling ORDer). EID is a unique value assigned to each element of DTD. ETID is hierarchy information between parent nodes and child nodes. SORD and SSORD represent an order information between sibling nodes and an order information among the sibling nodes with the same element respectively. Using this structured information, we design content index, structure index, and attribute index for efficient retrieval. Also, we shows that it supports the various type of queries such as content queries, structure queries, attribute queries and hybrid queries correctly.

三次元切削에서 表面거칠기와 切削力에 영향을 미치는 因子에 관한 硏究

李炯植,柳能秀 연세대학교 산업기술연구소 1978 논문집 Vol.8 No.1

Three dimensional cutting experiments were carried out in order to find out the effects of the cutting condition fators on the surface roughness of work and cutting force. For this experiments, SM 45c structural steel workpiece and single point tool with cemented carbide tip were used. Five factors, namely, cutting speed, feed, depth of cut, tool nose radius and tool angles were taken as the variables of cutting condition. The most effective factor for surface roghness and cuttive force were tool angle Ce. and depth of cut repectively. However, there is a critical value in cutting speed for the best surface finish. The relation of the five factors with surface roughness and cutting force were shown in three dimensional graphs, and these graphs will be generally applicable to determine the optimum cutting conditions.

개 원발성 면역매개성 혈소판 감소증 증례

유찬,임수정,이선희,박형진,김태신,송은식,김덕환,송근호 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2009 動物醫科學硏究誌 Vol.16 No.1

A 13-year-old, castrated male, Maltese-dog was admitted to the Veterinary Medical Teaching Hospital of Chungnam National University with the history fo petechiae. On physical examination, she had petechiae and ecchymoses at her back, bilateral inguinal region, and inner part of ear pinna. CBC indicated neutrophilia and severe thrombocytopenia. A few platelets, no autoagglutination of RBC, and no spherocyte were observed. Coagulation profile demonstrated normal PT, and aPTT. No significant findings was not found on serum biochemical profile and electolytes test. FNA of a splenic mass which was found on the abdominal radiograph and sonograph demonstrated extramedullary hematopoiesis, Proteinuria was observed on urinarysis. Primary immune-mediated thrombocytopenia was diagnosed by ruling out of other underlying disease, severe thrombocytopenia, and response to immunosuppressive therapy. Prednisone and antibiotics were administered orally and parenterally, respectively. After altering prednisone to azathioprine, the number of platelets was recovered to normal range and petechiae and ecchymoses were improved.

한국에서의 간질의 사회적 낙인

이상암,유희정,허경,박형국,신동진,송홍기,정원영,권오영,이성수,김요식,김성은,이병인 대한간질학회 2002 대한간질학회지 Vol.6 No.2