• 제목/요약/키워드: evaluation domain

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HIGHER JET EVALUATION TRANSVERSALITY OF J-HOLOMORPHIC CURVES

  • Oh, Yong-Geun
    • 대한수학회지
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    • 제48권2호
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    • pp.341-365
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    • 2011
  • In this paper, we establish general stratawise higher jet evaluation transversality of J-holomorphic curves for a generic choice of almost complex structures J (tame to a given symplectic manifold (M, $\omega$)). Using this transversality result, we prove that there exists a subset $\cal{J}^{ram}_{\omega}\;{\subset}\;\cal{J}_{\omega}$ of second category such that for every $J\;{\in}\;\cal{J}^{ram}_{\omega}$, the dimension of the moduli space of (somewhere injective) J-holomorphic curves with a given ramication prole goes down by 2n or 2(n - 1) depending on whether the ramication degree goes up by one or a new ramication point is created. We also derive that for each $J\;{\in}\;\cal{J}^{ram}_{\omega}$ there are only a finite number of ramication profiles of J-holomorphic curves in a given homology class $\beta\;{\in}\;H_2$(M; $\mathbb{Z}$) and provide an explicit upper bound on the number of ramication proles in terms of $c_1(\beta)$ and the genus g of the domain surface.

FFT 방법을 이용한 음압복사에 대한 Rayleigh Integral 의 수치해석적 연구 (Numerical Evaluation of The Rayleigh Integral Using the FFT Method for Transient Sound Radiation)

  • 전재진
    • 한국음향학회지
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    • 제7권4호
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    • pp.22-30
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    • 1988
  • 이 논문에서는 무한 격리벽내의 가장자리가 고정된 원형평판으로부터의 음압복사를 FFT 기법을 이용하여 계산하였다. 음장은 컴퓨터 계산시간을 절약하기 위해 Rayleigh integral 을 직접 수치해석적으로 구하는 대신에 공간영역에서 2차원 FFT 방법을 이용하였다. 그 결과 1/200의 시간을 절약할 수 있었다. FET방법은 원형평판형상 뿐만아니라 어떤 형상에도 적용 가능하며 복잡한 형상의 근거리 및 원거리 음장을 예측하는데 상당히 유효하다.

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SIME법의 과도안정도 판정속도 향상을 위한 새로운 발전기 그룹핑 방법 (A New Generator Grouping Method for Speed-up of Transient Stability Evaluation in SIME)

  • 안태형;이병준;권세혁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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    • pp.150-152
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    • 1999
  • This paper presents a new generator grouping method for speed-up of transient stability evaluation in SIME. The critical generators are grouped by new indices in the early stage of time domain simulation. And the simulation can be early terminated by fast stability evaluation using the time trajectory of equivalent one machine infinite bus. The main advantage of the proposed method is that it can be applied to stable cases as well as unstable ones. The effectiveness of the proposed method is tested on the PSS/E test system.

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RFID/USN기반 물류/유통 시스템의 평가를 위한 BSC 프레임워크 (A BSC Framework for the Evaluation of RFID/USN based Logistics/Distribution Systems)

  • 박정선
    • 대한안전경영과학회지
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    • 제16권4호
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    • pp.343-349
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    • 2014
  • Many systems using RFID/USN were and are being developed. Some systems are used in practice and some are not. Generally, the main reasons not being used are: The prices of chips are too high considering the effects. The application domain is not appropriate for RFID/USN. So, various skills for higher sensing precision have been introduced like using multiple sensors and avoiding metals which deter sensings seriously. Now, it is time to evaluate systems which were developed using RFID/USN technology. However, no systematic approach has been made for the evaluation. In this paper, a framework using BSC is introduced for the evaluation of systems using RFID/USN. In this framework, some Critical Success Factors(CSF) are derived and some Key Performance Indices(KPI) are developed for each CSF.

층간변위를 기반으로 한 다층구조물의 내전성능 평가를 위한 역량스펙트럼법의 개발 (Capacity Spectrum Method for Seismic Performance Evaluation of Multi-Story Building Based on the Story Drift)

  • 김선필;김두기;곽효경;고성혁;서형열
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2007년도 정기 학술대회 논문집
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    • pp.205-210
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    • 2007
  • The existing capacity spectrum method (CSM) is based on the displacement based approach for seismic performance and evaluation. Currently, in the domestic and overseas standard concerning seismic design, the CSM to obtain capacity spectrum from capacity curve and demand spectrum from elastic response spectrum is presented. In the multistory building, collapse is affected more by drift than by displacement, but the existing CSM does not work for story drift. Therefore, this paper proposes an improved CSM to estimate story drift of structures through seismic performance and evaluation. It uses the ductility factor in the A-T domain to obtain constant-ductility response spectrum from earthquake response of inelastic system using the drift and capacity curve from capacity analysis of structure.

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귀납적 사례학습에 의한 RC교량 주형의 상태평가 (State Evaluation of RC Bridge Girders by Inductive Case Learning)

  • 안승수;김기현;박광림;황진하
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2000년도 가을 학술발표회논문집
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    • pp.159-165
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    • 2000
  • A new state evaluation approach for structural safety is presented in this study. To reduce the subjectivity of the view and judgement of each expert founded on a limited body of knowledge in cognitive and inferential process of safety assessment, we introduced inductive learning method in AI. Inductive learning derives generalization from experiences. Decision tree induction algorithm analyzes the domain knowledge, produce rules via decision trees and then allow us to determine the classification of an object from case examples. The training set of state evaluation is constructed according to the selected attributes from working reports of RC bridge girders.

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Classification of Emotional States of Interest and Neutral Using Features from Pulse Wave Signal

  • Phongsuphap, Sukanya;Sopharak, Akara
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2004년도 ICCAS
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    • pp.682-685
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    • 2004
  • This paper investigated a method for classifying emotional states by using pulse wave signal. It focused on finding effective features for emotional state classification. The emptional states considered here consisted of interest and neutral. Classification experiments utilized 65 and 60 samples of interest and neutral states respectively. We have investigated 19 features derived from pulse wave signals by using both time domain and frequency domain analysis methods with 2 classifiers of minimum distance (normalized Euclidean distanece) and ${\kappa}$-Nearest Neighbour. The Leave-one-out cross validation was used as an evaluation mehtod. Based on experimental results, the most efficient features were a combination of 4 features consisting of (i) the mean of the first differences of the smoothed pulse rate time series signal, (ii) the mean of absolute values of the second differences of thel normalized interbeat intervals, (iii) the root mean square successive difference, and (iv) the power in high frequency range in normalized unit, which provided 80.8% average accuracy with ${\kappa}$-Nearest Neighbour classifier.

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Wavelet 변환간섭제거 방식을 이용한 대역 확산 통신시스템 성능분석 (Performance Evaluation of Spread Spectrum Communication System using the Wavelet Transform Interference Excision Scheme)

  • 박재오;이정재
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 1999년도 춘계종합학술대회
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    • pp.272-275
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    • 1999
  • 본 논문에서는 직접 대역 확산 통신 시스템에서 적응 알고리듬을 wavelet 변환 영역에 이용하여 협대역 간섭 성분을 효과적으로 억제할 수 있는 wavelet 변환 기저 적응 간섭 제거 시스템을 소개한다. 두 종류의 Daubechies wavelets(dbl, db8)를 이용한 간섭 제거 시스템의 성능 비교를 위하여 비트 오율을 Monte-Carlo 시뮬레이션을 이용하여 구하고 그 결과로부터 wavelet 특성에 따라 성능이 달라지며 효율적인 개선 효과를 기대할 수 있음을 보였다.

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파수영역법에 의한 PCB에서의 방사전계 계산 (Calculation of the Radiated E-Field from PCB by spectral Domain Analysis.)

  • 김동일;김형근;정세모
    • 한국항해학회지
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    • 제23권2호
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    • pp.61-66
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    • 1999
  • It is being more and more difficult to suppress emissions from electronic products using PCB(Printed Circuit Board) to the limit. Therefore, the exact evaluation of the emission from PCB has been more important to reduce the required time and the cost at the design phase of the products, especially on board ship's equipments. This research has evaluated the emission radiated from PCB based on the theoretical approach of SDA(Spectral Domain Analysis), which is available to analyze microwave stripline, coplanar line, patch antenna, etc. According to the theoretical results, it has been clearly shown that the emission radiated from PCB is reduced as the thickness of PCB is thinner, the permittivity of PCB is higher, the length of stripline is shorter, and the frequency is lower.

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심혈관계 시뮬레이터를 이용한 맥파 반사지점 추정방법들의 비교 (Evaluation of methods for estimating the pulse reflection site with cardiovascular simulator)

  • 이주연;신상훈
    • 대한한의진단학회지
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    • 제19권1호
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    • pp.47-54
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    • 2015
  • Objective Wave reflection is an important factor that determines the shape of the pulse wave. The purpose of this study is to compare the conventional method used for estimating the reflection site of pulse with a cardiovascular simulator. Methods: In this study, cardiovascular simulator with one elastic tube was used. The pressure and flow was measured simultaneously at three different points. The measured data were used to the conventional methods to estimate the pulse wave reflection site. The results were compared with the known length which were the distances from the measured points to the end of tube. Results & Conclusions: There is a significant error with the time domain method. While, the reflection site with the frequency domain method was similar to the actual reflection site.