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효율적인 상품평 분석을 위한 어휘 통계 정보 기반 평가 항목 추출 시스템
이우철,이현아,이공주,Lee, Woo-Chul,Lee, Hyun-Ah,Lee, Kong-Joo 한국정보처리학회 2009 정보처리학회논문지B Vol.16 No.6
본 논문에서는 상품평의 효율적인 분석을 위한 평가 항목 추출 시스템을 제안한다. 시스템은 크게 상품평 수집-보정과 평가 항목 추출의 두 단계로 구성된다. 상품평 수집-보정에서는 인터넷 쇼핑몰에서 상품평을 수집하고 상품평 특유의 구어체 표현과 맞춤법 오류 등을 처리한다. 평가 항목 추출에서는 스커트 상품 카테고리의 경우 ‘사이즈', ‘스타일'과 같이 상품을 평가하는 기준이 되는 항목을 상품평과 인터넷 상의 웹 문서를 활용하여 자동으로 추출한다. 상품평에 나타나는 명사들을 평가 항목 후보로 설정하고, 각 후보 명사의 상품평에서의 어휘 통계인 내부연관도와, 후보 명사와 상품 카테고리명의 웹 문서에서의 공기 빈도에 기반하여 계산된 외부연관도를 결합하여 상품과 평가 항목 후보의 연관도를 계산한다. 본 논문의 평가 항목 추출 방식은 평균 재현율 90%를 보여 기존 연구보다 우수한 결과를 보였다. In this paper, we introduce an automatic product feature extracting system that improves the efficiency of product review analysis. Our system consists of 2 parts: a review collection and correction part and a product feature extraction part. The former part collects reviews from internet shopping malls and revises spoken style or ungrammatical sentences. In the latter part, product features that mean items that can be used as evaluation criteria like 'size' and 'style' for a skirt are automatically extracted by utilizing term statistics in reviews and web documents on the Internet. We choose nouns in reviews as candidates for product features, and calculate degree of association between candidate nouns and products by combining inner association degree and outer association degree. Inner association degree is calculated from noun frequency in reviews and outer association degree is calculated from co-occurrence frequency of a candidate noun and a product name in web documents. In evaluation results, our extraction method showed an average recall of 90%, which is better than the results of previous approaches.
이우철,이현아,이공주,Lee, Woo-Chul,Lee, Hyun-Ah,Lee, Kong-Joo 한국정보처리학회 2010 정보처리학회논문지B Vol.17 No.1
In this paper, we introduce a system that summarizes product evaluation through linguistic analysis to effectively utilize explosively increasing product reviews. Our system analyzes polarities of product reviews by product features, based on which customers evaluate each product like 'design' and 'material' for a skirt product category. The system shows to customers a graph as a review summary that represents percentages of positive and negative reviews. We build an opinion word dictionary for each product feature through context based automatic expansion with small seed words, and judge polarity of reviews by product features with the extracted dictionary. In experiment using product reviews from online shopping malls, our system shows average accuracy of 69.8% in extracting judgemental word dictionary and 81.8% in polarity resolution for each sentence. 본 논문에서는 폭발적으로 증가하고 있는 상품평을 효과적으로 활용하기 위해 언어적 분석을 통하여 상품 평가를 요약하는 시스템을 제안한다. 시스템에서는 스커트 상품 분류의 경우 '디자인'과 '재질'과 같이, 상품을 평가하는 기준이 되는 항목에 대한 상품평의 부정과 긍정의 극성 여부를 판별하여 그래프 형태로 요약하여 제시한다. 본 논문에서는 작은 시드 어휘와 문맥에 기반한 자동 확장 방법을 사용하여 평가 항목 별 평가 어휘 극성 사전을 구축하여 평가 항목에 대한 상품평의 극성을 판정한다. 제안한 방식은 여러 온라인 쇼핑몰의 실제 상품평에 대한 실험에서 극성 사전 추출에서 평균 69.8%의 정확율과 문장별 극성 식별에서 평균 81.8%의 정확율을 보였다.
자갈궤도의 안정성 확보를 위한 확률론적 접근 방안에 대한 연구
이우철,최진유,임남형,이진옥,Lee. Woo-Chul,Choi. Jin-Yu,Lim. Nam-Hyoung,Lee. Chin-Ok 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
The behavior of continuous welded rail tracks is directly affected by the following various parameters: rail size; track curvature; neutral temperature; misalignment; and ballast resistance. Most of these parameters are having the nature of random variables. Therefore, uncertainties exist in the buckling safety assessments. The evaluation of the buckling safety and the maintenance strategy based on the deterministic analysis are very inefficient since the value of deterministic parameters are selected in worst track condition. In this study, the probabilistic approach method were investigated considering the probabilistic distribution of major parameters such as the neutral temperature of rail and the ballast resistance.
CCTV 영상의 교통상황 감시를 위한 공간점유율 산출 기법
이우철(Woo Chul Lee) 대한교통학회 2006 대한교통학회 학술대회지 Vol.54 No.-
비디오 이미지프로세싱 기반 시스템은 개발되어 지난 30년 동안 루프검지기의 대체 수단으로 보완 혹은 대체되어 사용되어 왔다. 장점으로는 많은 종류의 교통정보 얻을 수 있다. 예를 들면, 교통량, 속도, 차선변경, 교통류 흐름, 밀도, 차종 등이 있다. 하나의 카메라는 도로상에 위치한 일련의 루프검지기보다 더 넓은 영역을 주시하고 있으며 지나는 교통의 흐름에 방해를 주지 않고 설치 및 유지 관리를 할 수 있다. 따라서 비디오 이미지프로세싱 시스템은 전체 교통의 감시, 운영, 관리에 아주 큰 역할을 하고 있다 또한, 혼잡감시, 유고감시, 교차로 신호 통제, 자동요금징수 시스템 등 많은 응용분야에 사용되고 있다.
이우철(Lee Woo-Chul),이진옥(Lee Chin-Ok),최진유(Choi Jin-Yu),임남형(Lim Nam-Hyoung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
To ensure stability of continuous welded rail in extremely hot weather is important to the railway industry's goal of operational safety and maintenance. Rail temperature has direct influence on track buckling. According to climate condition, distribution of rail temperature is different. In this study, the fluctuation of rail temperature were investigated under the domestic climate condition (air temperature, humidity, insolation, etc).
이우철(Lee Woo Chul),류효진(Ryu Hyo Jin),임남형(Lim Nam Hyong),이진옥(Lee Chin Ok) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Continuous welded rail has many advantages over the conventional jointed rail. however It may cause high longitudinal force by temperature variation. Because the longitudinal force is very important among various parameters that depend to prevent the track buckling and that influence in effective maintenance procedure, In this paper, We shall present a approach for the prediction of rail longitudinal force using beam-column theory. Various parameters such as track modulus, ballast resistance, and unfastended length are considered effectively and rationally. After a spot verification, new longitudinal force measurement system may be developed using proposed equation.
이우철(Woo Chul Lee),이수봉(Soo Bong Lee),김영민(Young Min Kim),홍진희(Jin Hee Hong),성은영(Eun Young Seong),박성민(Sung Min Park),곽임수(Im Soo Kwak),나하연(Ha Youn Rha) 대한내과학회 1998 대한내과학회지 Vol.55 No.3
Objectives: Antiphospholipid syndrome(APS) is characterized by arterial or venous thrombosis, recurrent fetal loss, many neurological deficits, and presence of anticardiolipin antibody(ACA) or lupus anticoagulant(LA). This study was done to know the clinical and serological characteristics of antiphospholipid syndrome. Methods: Clinical and laboratory features of 18 patients with APS who had antiphopholipid antibodies and histories of obstetric events and thrombosis were studied. Results: Of the 18 patients, 4 were male, and 14 were female, and the ages ranged from 19 to 64 years. 11 patients were primary APS. 17 patients had ACAs: ll had IgG ACA; 2 had IgM ACA; 3 had both IgG and IgM; 1 had both IgG and IgA; 1 patient had LA. Antinuclear antibodies were positive(>1:40) in 15 patients, and antis-DNA(>l:10) were present in S patients. Hemolytic anemia was noted in 4 patients with positive in only direct Coomb`s test, and all were secondary APS. Thrombocytopenia(<150,000/mm3) was observed in 14 patients, 9 patients raged between 100,000/mm³ and 150,000/mm³. Initial presentation were vein thrombosis in 7 patients, pulmonary embolism in 3, arterial occlusion in 3, leg ulcer in 1, spontaneous abortion in 2, preeclampsia in 1, preterm labor in 1. Combined diseases were SLE, Sjogren syndrome, idiopathic thrombocytopenic purpura, hypertension. In 7 patients associated with cardiac abnormalities, 3 were mitral regurgitation, 4 were pericardial effusion, l was dilated cardiomyopathy. Venous thrombosis were present in 11 patients, 6 had deep vein thrombosis only, 3 had both deep vein thrombosis and pulmonary embolism Arterial occlusion were present in 4 patients, 3 had small multiple cerebral infarction, 1 had right common femoral ar4mal occlusion. Obstetric complications were present 5 patients of 14 female patients1` 3 had spontaneous abortion, preeclampsia was present in 1 and present labor was present in 1. Conclusions: The clinical and serological features of APS in this study were similar to those of previous reports (Oeffinger et al,1994: Edelman et al., 1995). Treatment with prednisolone, anticoagulants and antiplatelet agents was used. Of the 10 follow-up patients, none had recurrence of thrombotic events.