1,721,303 research outputs found
Yu, Sang-Hee
No full text학위논문(석사)아주대학교 ITS대학원 :교통공학과,2012. 2본 연구에서는 고속도로를 유지관리하면서 발생할 수 있는 비반복적 정체의 일부분인 차단교통사고 처리시간 예측모델을 개발하기 위하여 과거 차단사고 발생자료를 이용하여 강원권 영동고속도로에서의 사고들을 처리시간별, 관련차량별, 위치별로 분석하여 필요한 인자를 구하였다. 차단원인 제거 시점에서의 누적차량을 기준으로 지체해소시간 예측모형을 연구하였다.
차단사고 분석에서는 화물차 및 트레일러 등 대형차 교통사고가 처리시간이 많이 소요되었고, 관련차량 대수가 3대 이상일수록 처리시간이 많이 소요되었음을 알 수 있었다.
병목지점에서의 대기행렬 모형식을 기본으로 고속도로 차단사고시 정체 해소시간 예측모형을 구하였는데, 주요인자들은 차단발생시점부터 소통재개 시간(T1), 구간별 정상소통시 교통량(C), 부분소통시 처리대수(C′) 그리고 누적차량대수(V) 등 4가지가 있다. 본 연구에서는 주요인자들을 산출할 때에 도로관리자나 교통센터근무자가 쉽게 이해하고 해결할 수 있도록 산출값들을 단순화하고 간략화 하는데 주안점을 두었다.
고속도로에서 차단교통사고가 발생되면 도로관리자 또는 교통상황근무자 4가지 주요인자들을 모형식에 대입하여 간편하고 신속하게 정체 해소시간을 산출하여 예측된 시간을 이용객들에게 홍보하여 교통관리 및 교통사고처리에 적극 활용할 수 있다.제 1장 서 론 1
1.1 연구의 배경 및 목적 1
1.2 연구의 범위 및 내용 2
1.3 연구의 수행과정 4
제 2장 관련 이론 및 기존연구 고찰 5
2.1 관련 이론 고찰 5
2.2 기존 연구 고찰 8
2.3 연구의 착안점 18
제 3장 대기행렬 기반 차단 해소시간 예측 20
3.1 대기행렬 기반 해소시간 예측의 개요 20
3.2 대기행렬 모형 검토 21
3.3 예측 모형 주요 변수 자료 수집 및 분석 25
3.4 차단 해소시간 예측 모형 30
제 4장 차단사고 분석 및 예측 모형 검증 33
4.1 차단사고 통계 분석 33
4.2 차단사고별 처리시간 세부분석 43
4.3 모형적용 예측시간 검증 50
제 5장 결 론 51
5.1 연구의 결론 51
5.2 향후 연구 방향 52Maste
Continuity of housing rehabilitation in Wah Fu Estate.
Get PDFWong Yu Sang."Architecture Department, Chinese University of Hong Kong, Master of Architecture Programme 2004-2005, design report."Includes bibliographical references
Vortex formation and its developing process of the upward impinging jet
No full text학위논문(석사) - 한국과학기술원 : 기계공학전공, 2000.2, [ i, 50 p. ]한국과학기술원 : 기계공학전공
철-크롬 합금의 마텐사이트 상 전이중 Acoustic emission
No full text학위논문(석사) - 한국과학기술원 : 물리학과, 1983.2, [ [iii], 62 p. ]Study on the martensitic transition of the iron-chromium alloy during thermal cycling was performed by acoustic emission method. It was observed that the acoustic emission during martensitic transition in this alloy was composed only of the burst type. The Ms temperature determined by the acoustic emission method was nearly . During various stages of transformation, the amplitudes of acoustic emission were investigated. Emissions of small amplitude were dominant in the stage of initiation, emissions of large amplitude were generated in the middle stage, and of small amplitude were dominantly generated again in the final stage. During thermal cycling, total count of acoustic emission had decreased due to a gradually decreasing completeness of the transformation because of the accumulation of stabilized austenite.한국과학기술원 : 물리학과
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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