• 제목/요약/키워드: rough set

검색결과 258건 처리시간 0.028초

Investigation of the effect of weak-story on earthquake behavior and rough construction costs of RC buildings

  • Gursoy, Senol;Oz, Ramazan;Bas, Selcuk
    • Computers and Concrete
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    • 제16권1호
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    • pp.141-161
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    • 2015
  • A significant portion of residential areas of Turkey is located in active earthquake zones. In Turkey occurred major earthquakes in last twenty years, such as Erzincan (1992), Kocaeli and $D{\ddot{u}}zce$ (1999), $Bing{\ddot{o}}l$ (2003), Van (2011). These earthquakes have demonstrated that reinforced concrete (RC) buildings having horizontal and vertical irregularities are significantly damaged, which in turn most of them are collapsed. Architectural design and arrangement of load-bearing system have important effect on RC building since architectural design criteria in design process provide opportunity to make this type of buildings safer and economical under earthquake loads. This study aims to investigate comparatively the effects of weak story irregularity on earthquake behavior and rough construction costs of RC buildings by considering different soil-conditions given in the Turkish Earthquake Code. With this aim, Sta4-CAD program based on matrix displacement method is utilized. Considering that different story height and compressive strength of concrete, and infill walls or their locations are the variables, a set of structural models are developed to determine the effect of them on earthquake behavior and rough construction costs of RC buildings. In conclusion, some recommendations and results related to making RC buildings safer and more economical are presented by comparing results obtained from structural analyses.

사후확률에 기반한 근사 규칙의 생성 (Creation of Approximate Rules based on Posterior Probability)

  • 박인규;최규석
    • 한국인터넷방송통신학회논문지
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    • 제15권5호
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    • pp.69-74
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    • 2015
  • 본 논문에서는 데이터베이스의 정보시스템을 구성하는 속성을 감축하여 빠른 검색을 보장하는 제어규칙의 생성에 관한 연구이다. 일반적으로 정보시스템에는 불필요한 많은 속성들이 존재하고 있다. 이때 정보시스템의 객체들이 비일관적일 경우에는 응답의 정확성을 기대하기 어렵게 된다. 그러므로 본 논문에서는 러프엔트로피의 개념과 베이지언 사후확률을 적용하여 불필요한 속성을 제거하여 정보시스템을 간결화 하는데 주안점을 두었다. 제안된 알고리즘에서는 러프이론에 기반한 최적의 리덕트를 생성하는 과정에서 사후확률을 적용하여 결정속성에 대한 조건속성의 함의를 러프엔트로피의 척도로 비교하여 영향력이 약한 속성을 제거하여 제어규칙을 간결하게 표현할 수 있다. 제안된 알고리즘을 신입사원의 채용에 적용하여 지식감축의 효용성을 보인다.

황삭 및 정삭을 고려한 통합형 NURBS 곡면 인터폴레이터 (Integrated NURBS Surface Interpolator Considering Both Rough and Finish Cuts)

  • 구태훈;지성철
    • 대한기계학회논문집A
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    • 제27권11호
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    • pp.1958-1966
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    • 2003
  • Three-axis CNC surface machining entails a series of processes including rough cutting, intermediate cutting and finish cutting for a reference surface defined in CAD/CAM. This study is targeting development of an integrated NURBS surface interpolator that can incorporate rough, intermediate and finish cutting processes. In each process, volume to be removed and cutting condition are different according to the shape of a part to be machined and the reference surface. Accordingly, the proposed NURBS surface interpolator controls motion in real-time optimized for the machining conditions of each process. In this paper, a newly defined set of G-codes is proposed such that NURBS surface machining through CNC is feasible with minimal information on the surface composition. To verify the usefulness of the proposed interpolator, through computer simulations on NURBS surface machining, total machining time, size of required NC data and cutting force variations are compared with the existing method.

가장자리 효과가 고려된 임의의 기복을 가진 완전도체 표면에서의 전자파 산란 (Electromagnetic Wave Scattering from a Perfectly Conducting Random Rough Surface with Considering the Edge Effect)

  • 최동묵;김채영
    • 한국통신학회논문지
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    • 제27권3B호
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    • pp.244-250
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    • 2002
  • 본 논문은 임의 형태의 기복을 가진 완전 도체 표면에서 산란된 장을 모멘트 방법에 의해 구하였다. 디지털 컴퓨터를 이용하여 통계적인 특성이 알려진 임의 형태의 기복을 가진 1차원 표면을 생성하였다. 계산에 사용된 표면의 수는 100개였고, 표면의 길이는 80 파장이었다. 표면의 양끝에서 생기는 가장자리 효과를 없애기 위해 가우시안 테이퍼 함수를 사용하였다. 그리고 몬테칼로 기법을 이용하여 양방향 산란계수와 역방향 산란계수를 구하였다. 계산된 결과의 타당성을 검증하기 위해 키르히호프 근사기법을 이용하여 계산된 결과와 비교하였다. 그 결과 양자간의 결과는 서로 잘 일치함을 알 수 있었다.

Design and Evaluation of a Dynamic Anomaly Detection Scheme Considering the Age of User Profiles

  • Lee, Hwa-Ju;Bae, Ihn-Han
    • Journal of the Korean Data and Information Science Society
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    • 제18권2호
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    • pp.315-326
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    • 2007
  • The rapid proliferation of wireless networks and mobile computing applications has changed the landscape of network security. Anomaly detection is a pattern recognition task whose goal is to report the occurrence of abnormal or unknown behavior in a given system being monitored. This paper presents a dynamic anomaly detection scheme that can effectively identify a group of especially harmful internal masqueraders in cellular mobile networks. Our scheme uses the trace data of wireless application layer by a user as feature value. Based on the feature values, the use pattern of a mobile's user can be captured by rough sets, and the abnormal behavior of the mobile can be also detected effectively by applying a roughness membership function with both the age of the user profile and weighted feature values. The performance of our scheme is evaluated by a simulation. Simulation results demonstrate that the anomalies are well detected by the proposed dynamic scheme that considers the age of user profiles.

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ENERGY FINITE p-HARMONIC FUNCTIONS ON GRAPHS AND ROUGH ISOMETRIES

  • Kim, Seok-Woo;Lee, Yong-Hah
    • 대한수학회논문집
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    • 제22권2호
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    • pp.277-287
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    • 2007
  • We prove that if a graph G of bounded degree has finitely many p-hyperbolic ends($1) in which every bounded energy finite p-harmonic function is asymptotically constant for almost every path, then the set $\mathcal{HBD}_p(G)$ of all bounded energy finite p-harmonic functions on G is in one to one corresponding to $\mathbf{R}^l$, where $l$ is the number of p-hyperbolic ends of G. Furthermore, we prove that if a graph G' is roughly isometric to G, then $\mathcal{HBD}_p(G')$ is also in an one to one correspondence with $\mathbf{R}^l$.

러프논리에 기반한 객체지향 컴포넌트의 재사용 결정 알고리즘 생성 (Generation of Reusability Decision Algorithm of Object-Oriented Components based on Rough Logic)

  • 이성주
    • 한국지능시스템학회논문지
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    • 제9권6호
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    • pp.583-590
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    • 1999
  • 본 연구에서는 컴포넌트의 획득시점에서 객체지향 컴포넌트의 재사용 가능성을 능동적으로 결정할수 객체지향 컴포넌트의 재사용성 결정 모델을 제안한다. 먼저 제안된 모델은 객체지향 컴포넌트의 재사용 결정을 위한 속성들을 선택한다,다음으로 여러 연구들에서 제시된 객체지향 클래스의 품질척도들과 품질 분류기준들에 근거하여 실제 재사용주인 컴포넌트들에서 재사용 정보를 추출한다. 마지막으로 러프집합을 이용하여 추출된 정보에서 객체지향 컴포넌트의 재사용 결정알고리즘을 생성한다.

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A Study on Color Fuzzy Decision Algorithm in Video Object Segmentation

  • Byun, Oh-Sung;Moon, Sung-Ryong
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • 제4권2호
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    • pp.142-148
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    • 2004
  • In this paper, we propose the color fuzzy decision algorithm to face segmentation in a color image. Our algorithm can segment without the user's interaction by fuzzy decision marking. And it removes small parts such as a noise using wavelet morphology in the image obtained by applying the fuzzy decision algorithm. Also, it merges and chooses the face region in each quantization image through rough sets. This video object division algorithm is shown to be superior to a conventional algorithm.

Scalable Approach to Failure Analysis of High-Performance Computing Systems

  • Shawky, Doaa
    • ETRI Journal
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    • 제36권6호
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    • pp.1023-1031
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    • 2014
  • Failure analysis is necessary to clarify the root cause of a failure, predict the next time a failure may occur, and improve the performance and reliability of a system. However, it is not an easy task to analyze and interpret failure data, especially for complex systems. Usually, these data are represented using many attributes, and sometimes they are inconsistent and ambiguous. In this paper, we present a scalable approach for the analysis and interpretation of failure data of high-performance computing systems. The approach employs rough sets theory (RST) for this task. The application of RST to a large publicly available set of failure data highlights the main attributes responsible for the root cause of a failure. In addition, it is used to analyze other failure characteristics, such as time between failures, repair times, workload running on a failed node, and failure category. Experimental results show the scalability of the presented approach and its ability to reveal dependencies among different failure characteristics.

스네이크와 레벨 셋 방법을 결합한 개체 윤곽 추출 알고리즘 (Object Contour Extraction Algorithm Combined Snake with Level Set)

  • 황재용;오응군;장종환
    • 정보처리학회논문지:소프트웨어 및 데이터공학
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    • 제3권5호
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    • pp.195-200
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    • 2014
  • 능동 개체 윤곽 추출의 대표적인 방법은 스네이크(Snake)와 레벨 셋(Level Set) 기술이다. 일반적으로 스네이크는 속도는 빠르나 개체 위상을 처리하는 데 제약이 있다. 그러나 레벨 셋은 속도는 느리지만 개체 위상에 관계없이 잘 처리할 수 있는 장점이 있다. 본 논문에서는 빠르고 복잡한 위상을 처리하기 위해 두 방법의 장점을 이용한 알고리즘을 제안한다. 알고리즘은 2단계로 구성된다. 첫 번째 단계는 스네이크를 사용하여 빠르게 개체의 대략적인 윤곽을 추출한 후 레벨 셋을 두 번째 적용하여 복잡한 개체 윤곽을 정확하게 추출한다. 제안한 알고리즘은 다양한 위상을 갖는 5개의 이진영상 및 2개의 자연영상에 적용하여 속도 및 윤곽 추출이 개선된 것을 보여 준다.