• 제목/요약/키워드: historical change

검색결과 801건 처리시간 0.023초

On the complexity of earthquake sequences: a historical seismology perspective based on the L'Aquila seismicity (Abruzzo, Central Italy), 1315-1915

  • Guidoboni, Emanuela;Valensise, Gianluca
    • Earthquakes and Structures
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    • 제8권1호
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    • pp.153-184
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    • 2015
  • Most damaging earthquakes come as complex sequences characterized by strong aftershocks, sometimes by foreshocks and often by multiple mainshocks. Complex earthquake sequences have enormous seismic hazard, engineering and societal implications as their impact on buildings and infrastructures may be much more severe at the end of the sequence than just after the mainshock. In this paper we examine whether historical sources can help characterizing the rare earthquake sequences of pre-instrumental times in full, including fore-, main- and aftershocks. Thanks to the its huge documentary heritage, Italy relies on one of the richest parametric earthquake catalogues worldwide. Unfortunately most current methods for assessing seismic hazard require that earthquake catalogues be declustered by removing all shocks that bear some dependency with those identified as mainshocks. We maintain that this requirement has led most modern historical seismologists to focus mainly on mainshocks rather than also on the fore- and aftershocks. To shed light onto major earthquake sequences of the past, rather than onto individual mainshocks, we investigated 10 damaging earthquake sequences ($M_w$ 4.7-7.0) that hit the L'Aquila area and central Abruzzo from the 14th to the 20th century. We find that most of the results of historical research are important for modern seismology, yet their rendering by the current parametric catalogues causes most information to be lost or not easily transferred to the potential users. For this reason we advocate a change in current strategies and the creation of a more flexible standard for storing and using all the information made available by historical seismology.

학교수학과 대학수학에서 정의와 증명 개념 변화에 대한 수학사적 분석 (Historical Analysis of Definition and Proof Conceptions in the Transition from Secondary to Tertiary Mathematics)

  • 이지현;최영기
    • 대한수학교육학회지:수학교육학연구
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    • 제21권1호
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    • pp.57-65
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    • 2011
  • 이 연구는 학교수학에서 대학수학으로의 이행과정에서 정의와 증명의 변화와 관련하여, 기하학에서 공리적 방법의 발달과정을 분석하였다. 고대 그리스에서 현대수학적인 공리적 방법으로의 변화를 이해하는데 있어서, 상수 혹은 변수라는 기본용어의 성격 차이는 중요한 지표이다. 특히 기본용어의 상수에서 변수로의 성격 변화는 수학에서 정의와 증명 개념 및 수학에 대한 인식 변화를 설명한다. 이러한 수학사적 분석은 대학수학의 입문과정에서 형식적 정의와 증명 개념의 의미를 설명하는 데 유용하게 사용될 수 있으리라 기대된다.

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한국 가계양식의 변천과정과 특성에 관한 연구 (A Study on the Process of Change and Characteristics of Korean Gagye Style)

  • 임린;김은정
    • 복식
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    • 제55권7호
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    • pp.142-155
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    • 2005
  • This study shows historical Gagye(가계) The process of change and Characteristics through analysis on the old documents, related papers, and visual data, and represents its meaning in Korean Clothing history through analysis on originality of Korean Gagye(가계) style. Gagye(가계) is the cubic hair style which add other accessories on hair and is divided into two; Gagye(가계) and Chegye(체계) according to its material, role, and function. And Korean Gagye(가계) has been transformed suited to the times and showed various features according to pattern, wearing, and decoration aspect. In its style aspect, Korean Gagye(가계) style shows Hwangye type, Sseugae type, Gogye type, Dagye type, and Braided & coiled hair type. Each shows historical features. In its Wearing aspect, Gagye(가계) style shows Wearing ornamental hairpin on the head, Wearing Rag Ribbon on the head, and Attaching (Detaching) Wearing. And in its Decoration aspect, Gagye(가계) style shows decoration with accessories, one with flower arrangement, and one with shaking.

그래프 이력 데이터 접근을 위한 효과적인 저장 관리 기법 (Efficient Storage Management Scheme for Graph Historical Retrieval)

  • 김기훈;김이나;최도진;김민수;복경수;유재수
    • 한국콘텐츠학회논문지
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    • 제18권2호
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    • pp.438-449
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    • 2018
  • 최근 소셜 네트워크, 인용 네트워크 등 여러 분야에서 다양한 그래프 데이터가 활용되고 있다. 시간에 따라 그래프가 동적으로 변화함에 따라 변경 내용 추적 및 특정 시점 그래프 검색을 위해 그래프 이력 데이터를 관리하는 것이 필요하다. 대부분의 이력 데이터는 시간에 따라 부분적인 변화가 발생하기 때문에 시간 단위로 데이터를 저장할 경우 변경되지 않은 데이터가 중복 저장된다. 본 논문에서는 시간별 그래프의 중복 저장을 최소화하기 위한 그래프 이력 저장 관리 기법을 제안한다. 제안하는 기법은 그래프의 변화를 계속적으로 탐지하여 과거 그래프와 중복되는 서브 그래프를 하나의 중복 스냅샷에 저장한다. 중복 스냅샷에는 다수의 델타 스냅샷이 연결되어 각 시간에 따른 변화 데이터를 유지한다. 중복 스냅샷에 저장된 중복 데이터를 공통으로 관리하여 공간의 효율을 향상시킨다. 또한, 해당 시점의 그래프를 탐색하기 위해서 중복 스냅샷과 델타 스냅샷을 연결하였다. 제안하는 기법의 우수성을 보이기 위해 다양한 성능평가를 수행한다.

서양 Bag에 관한 연구 - 중세~근대를 중심으로 - (A Study on Bag in the Western - From the Middle Ages to Modern Times -)

  • 이의정;강경애
    • 한국의상디자인학회지
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    • 제11권3호
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    • pp.27-41
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    • 2009
  • As for modern people, the fashion accessory plays a role in allowing the whole coordination in clothing to be highlighted, receives environmental factors in the complementary relationship with clothing, and is being progressed rapidly as well. Among accessories, it is considered to be probably significant to examine especially about the historical consideration and the transitional process in bag, which becomes a means of expressing free individuality in fashion while recognizing importance of bag, which is being developed today as a necessary article along with diverse lifestyles in each individual. Accordingly, the purpose of this study was to examine which correlation a bag comes to have with clothing according to a historical change in fashion and was changed in the transitional process of historical consideration on bag from the latter half of the medieval times to the modern times. Also, it tries to analyze on features in a form, material, kind, and color by period in a bag. Thus, the aim is to be conducive to a future qualitative research on bag Through the research process, it could be known about which a bag has been changed into diverse forms while experiencing several processes in order to conform with a flow of clothing, which is required by society according to a change in period, and about its historical significance, value, and aesthetic characteristics. It was certainly necessary for walking about with putting commodity necessary for people in it. As one of accessories that cannot be separated from clothing, it makes it available for knowing user's social standing and position and living scale, and makes it realized for the importance influence upon establishing a woman's identity.

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TV 사극 <이산>의 현대적 감각의 남자 궁중의상디자인 개발 (The Design Development of Man's Royal Costume in TV Historical Drama )

  • 이금희;이혜란
    • 복식문화연구
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    • 제17권6호
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    • pp.1112-1128
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    • 2009
  • The purpose of this study was to develop royal costume design with contemporary taste depending on the character of hero, Lee San, and time flow of TV historical drama and research design discrimination and creative expression. As study methods, the literature study using books and theses concerning costume, fine art, culture and history were used for theoretical background and the empirical study method manufacturing actual costume on the basis of literature and relic were used for dress manufacture. The design concept of costume was modern & chic & clean. The costume was designed through straight silhouette, clean & bright colors excluding prime colors, style transformed to permanent straight pleats on the basis of chulik, 100% silk material focusing on high quality and pattern & decoration of the age of Three Kingdoms. As results, the designs of princess' official rob, day dress and chulik, and emperor's official robe, chulik, military dress and chun-dam-bok were developed. The design discrimination depending on social status change. In the period of princess, black, white, silver and blue were used but in the period of emperor, red, gold and black were used. It was expressed through dragon pattern and extended length used in cloth. The design discrimination depending on character change was visualized through color. Although it is not consistent with historical investigation, contemporary fashion design elements were added to royal costume through color contrast of black & white, permanent straight pleats, velcore, wristlet, extended length and layered-look.

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과거 교통정체 패턴을 이용한 현재의 교통정체 변화 판별 알고리즘 (An Algorithm for Identifying the Change of the Current Traffic Congestion Using Historical Traffic Congestion Patterns)

  • 이경민;홍봉희;정도성;이지완
    • 정보과학회 컴퓨팅의 실제 논문지
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    • 제21권1호
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    • pp.19-28
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    • 2015
  • 본 논문에서는 과거 교통정체 패턴을 이용하여 현재의 교통정체가 풀리는 정체인지 아니면 악화되는 정체인지를 판별하는 알고리즘을 제안한다. 과거 교통정체 패턴은 다중 포인터를 이용하여 정체구간들을 연결한 인접 리스트에 교통정체의 시간적 길이와 공간적 길이로 저장된다. 교통정체가 시작된 구간에 해당하는 헤드노드를 탐색하고 현재패턴과 가장 유사한 과거 교통정체 패턴을 이용하여 장래의 교통정체 변화정보를 제공한다. 실험을 통해 검증한 결과, 도로 구간 하나에 대한 정체 변화를 판별하였을 때 실제 값과 비교해서 평균적으로 15분 오차를 보였으며, 연속된 다수의 도로 구간들을 결합하여 비교적 긴 구간의 정체 변화를 판별하였을 경우 평균적으로 10분 이내의 오차를 보이며 실제 값과 유사한 것을 보였다.