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단어 간 의미적 연관성을 고려한 어휘 체인 기반의 개선된 자동 문서요약 방법
차준석,김정인,김판구,Cha, Jun Seok,Kim, Jeong In,Kim, Jung Min 한국스마트미디어학회 2017 스마트미디어저널 Vol.6 No.1
최근 스마트 디바이스의 급속한 발달과 보급으로 인하여 인터넷 웹상에서 등장하는 문서의 데이터는 하루가 다르게 증가 하고 있다. 이러한 정보의 증가로 인터넷 웹상에서는 대량의 문서가 증가하여 사용자가 해당 문서의 데이터를 이해하는데, 어려움을 겪고 있다. 그렇기 때문에 자동 문서 요약 분야에서 문서를 효율적으로 요악하기 위해 다양한 연구가 진행 되고 있다. 효율적으로 문서를 요약하기 위해 본 논문에서는 텍스트랭크 알고리즘을 이용한다. 텍스트랭크 알고리즘은 문장 또는 키워드를 그래프로 표현하며, 단어와 문장 간의 의미적 연관성을 파악하기 위해 그래프의 정점과 간선을 이용하여 문장의 중요도를 파악한다. 문장의 상위 키워드를 추출 하고 상위 키워드를 기반으로 중요 문장 추출 과정을 거친다. 중요 문장 추출 과정을 거치기 위해 단어 그룹화 과정을 거친다. 단어그룹화는 특정 가중치 척도를 이용하여 가중치 점수가 높은 문장을 선별하여 선별된 문장들을 기반으로 중요 문장을 중요 문장을 추출하여, 문서를 요약을 하게 된다. 이를 통해 기존에 연구 되었던 문서요약 방법보다 향상된 성능을 보였으며, 더욱 효율적으로 문서를 요약할 수 있음을 증명하였다. Due to the rapid advancement and distribution of smart devices of late, document data on the Internet is on the sharp increase. The increment of information on the Web including a massive amount of documents makes it increasingly difficult for users to understand corresponding data. In order to efficiently summarize documents in the field of automated summary programs, various researches are under way. This study uses TextRank algorithm to efficiently summarize documents. TextRank algorithm expresses sentences or keywords in the form of a graph and understands the importance of sentences by using its vertices and edges to understand semantic relations between vocabulary and sentence. It extracts high-ranking keywords and based on keywords, it extracts important sentences. To extract important sentences, the algorithm first groups vocabulary. Grouping vocabulary is done using a scale of specific weight. The program sorts out sentences with higher scores on the weight scale, and based on selected sentences, it extracts important sentences to summarize the document. This study proved that this process confirmed an improved performance than summary methods shown in previous researches and that the algorithm can more efficiently summarize documents.
윤성효(Sung-Hyo Yun),차준석(Jun-Seok Cha),고정선(Jeong-Seon Koh),이상원(Sang Won Lee) 한국암석학회 2012 암석학회지 Vol.21 No.3
제주도 사라봉 부근의 산지등대, 비석거리에서 나타나는 하와이아이트에는 티탄이 풍부한 각섬석(캘수타이트)과 사장석이 반정으로 나타난다. 또한 휘석, 감람석 미반정을 포함하며, 인회석과 소량의 K장석 래스도 나타난다. 캘수타이트는 자형 또는 반자형으로 불투명광물 반응연을 가진 반정으로 주로 산출되며, 해안가 시료의 캘수타이트는 산화철 형태로 치환되어 각섬석 가상을 관찰할 수 있다. 아주 드문 형태로 휘석 결정 내에 캘수타이트가 반응연 관계로 나타나는 형태를 볼 수 있으며, 이를 통해 유체에 의한 2차적인 수화반응이 있었음이 추정된다. 압력-AlT 지질압력계 관계식에 적용하여 결정화작용 압력을 추정한 결과, 산지등대의 시료에서는 약 6.3 kb, 비석거리의 경우 약 4.9 kb의 값을 얻을 수 있었다. 이를 통해 산지등대의 각섬석은 비석거리에 형성된 각섬석보다 더 깊은 곳에서 유체의 유입이 있었으며, 자형 반정의 형태와 인회석 포유물의 존재로부터 호스트마그마로부터 결정화작용을 통해 성장되었을 것으로 추정된다. Hawaiite which distributed in Sanjideungdae of Sarabong cinder cone and Biseokgeori area in northern part of Jeju island, contains phenocrysts of titanium-rich hornblende (kaersutite) and plagioclase with microphenocrysts of olivine, pyroxene and very small amounts of K-feldspar lath and apatite. Kaersutite is mostly euhedral or subhedral phenocrysts having opaque reaction rim. And kaersutite in Sanjideungdae area completely replaced to opaque minerals showing pseudomorph. Also it may be seen partly replacement of pyroxene by kaersutire as reaction rim. It is considered that hydration reaction had occurred with fluids. The crystallization pressure of kaersutite using pressure-Al<SUP>T</SUP> geobarometer is approximately 6.3 kb in Sanjideungdae area and 4.9 kb in Biseokgeori area, respectively. As a result, fluid injection to magma and crystallization of kaersutite of Sanjideungdae hawaiite is deeper than that of Biseokgeori hawaiite, and it was growed to phenocrysts through crystallization. It is estimated that kaersutite of Biseokgeori hawaiite originated from crystallization from the host magma, based on the euhedral nature of the phenocrysts and on the presence of apatite inclusions.
이주형(Ju-Hyoung Lee),차준석(Jun-Seok Cha),홍지형(Ji-Hyung Hong),정동일(Dong-Il Jung),김지영(Ji-Young Kim) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.1
Benzene is a very harmful and toxic compound known as human carcinogen by all routes of exposure. Owing to the risky feature of benzene, several countries such as Japan, UK and EU have established the ambient air quality standard and protect from that risk of it. Korea also has designated it as one of the criteria air pollutants and established the concentration limit (5 ㎍/㎥) in the air and is going to apply the standard from 2010. Benzene is emitted from various sources such as combustion plants, production processes, waste treatment facilities and also automobiles. Mobile source is known as one of the major emission sources of benzene. In this study, we estimated the domestic emissions of benzene from mobile source and compared the results with those of advanced countries. Mobile source was divided into 2 categories, i.e., on-road source and non-road source. The total emissions of benzene from mobile source were estimated as 3,106 tons/yr and 1,612 tons/yr was emitted from on-road source and 1,494 tons/yr was from non-road source. Emission ratio of benzene from on-road source showed that 80.0% was from passenger cars, 10.1% was from taxis, 7.2% was from light-duty vehicles, 2.5% was from heavy-duty vehicles and 0.2% was from buses. In the case of non-road source, the distribution showed that 66.3% was from construction machineries, 14.5% was from locomotives, 11.7% was from ships, 7.1% was from agriculture equipments and 0.5% was from aircrafts. The cold-start emissions were estimated as 942 tons/yr and this value was almost 1.5 times greater than that for hot engine emissions (608 tons/yr). In addition, the fuel-based distribution was 65.9%, 31.1% and 2.8% from gasoline, LPG and diesel vehicles, respectively. The emission ratio from mobile source occupied 65% and 30% of total benzene emissions in USA and UK, respectively. In case of Korea, the emission ratio of benzene from mobile source occupied 29% (15% from on-road source, 14% from non-road source) which showed similar value with UK.
박재성(Jae-sung Park),김기헌(Ki-heon Kim),차준석(Jun-seok Cha),이상우(Sang-woo Lee),최훈근(Hun-geun Choi),오길종(Gil-jong Oh) 한국열환경공학회 2012 한국열환경공학회 학술대회지 Vol.2012 No.-
Refuse-derived fuels(RDF) production plants in Korea are assessed for strategic environmental analysis and environment-friendly sustainable management. All of pollutants in plants exhaust gas were blow the Korean standard for waste incineration except carbon mono-oxide. Dioxins and Furans were decected from dry process in RDF plant and were increased by treatment quantities of input MSW. That results support demands of standard for dioxins and furans. The impact of set up pollutants standard for RDF plant exhaust gas is not critical technically and economically. After revising of Korean RDF quality criteria, government should compose monitoring system for proper operation and management of RDF production plnats. These results could be a reference to drive 19 projects in planning and operating RDF plants by rural and central governments, and also give us fundamental information to construct preliminary pollutants standards for RDF production plants in Korea.
이상우(Sang-woo Lee),박재성(Jae-sung Park),김기헌(Ki-heon Kim),차준석(Jun-seok Cha),최훈근(Hun-geun Choi),오길종(Gil-jong Oh) 한국열환경공학회 2012 한국열환경공학회 학술대회지 Vol.2012 No.-
To identify variation factors of property and quality, solid recovered fuels(SRF) produced from two facilities in Korea were analyzed for moisture, combustibles and ash content, heavy metals concentration, progress comparison. The results show that SRFs quality is suitable for Korean criteria of management, however, production efficiency and quality of variation is so large to compare seasonally. It may be caused by input waste property of regional and progress characteristics. Further research could be verify detailed reasons through mass balance and repeated analysis .