• 제목/요약/키워드: Spacial frequency

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친환경 요소로서의 경관과 그에 어울리는 소리의 선택 (The Selection of the Scenery and Sound as the Environmental Friendly Elements)

  • 김항;전지현;장길수;국찬;신용규
    • 한국소음진동공학회논문집
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    • 제16권4호
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    • pp.414-419
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    • 2006
  • In this research, the test how the evaluation of the spacial image influenced by the environmental friendly elements included in the visual information, and how the selection of the sound changed depending on the characteristics of spacial image were carried out by the 40 subjects. Vast tracts of green land and the waterfront were highly preferred and impressive than the other spaces. The green music, signal with water sound and bird chirping sound were highly scored. In the frequency characteristics of the factors, the first factor was artificial sound (high at the low frequency band), the second was natural sound(uniform at all frequency band) and the third was water sound (high at the middle and high frequency band over 500 Hz) . This shows that the proposal of the sound which has the frequency characteristics fit to the spacial image should be selected for the soundscape of the target space.

친환경 요소로서의 경관과 그에 어울리는 소리의 선택 (The Selection of the Scenery and Sound as the Environmental Friendly Elements)

  • 신용규;전지현;장길수;국찬
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2005년도 추계학술대회논문집
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    • pp.682-685
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    • 2005
  • In this research, how the evaluation of the spacial image influenced by the environmental friendly elements included in the visual information, and how the selection of the sound changed depending on the characteristics of spatial image by the 40 subjects were carried out. Vast tracts of green land and the waterfront were highly preferred and impressive than the other spaces. The green music, signal with water sound and bird chirping sound were highly scored. In the frequency characteristics of the factors, the first factor was artificial sound(high at the low frequency band), the second was natural sound(uniform at all frequency band) and the third was water sound(high at the middle and high frequency band over 500Hz). This shows that the proposal of the sound which has the frequency characteristics fit to the spacial image should be selected for the soundscape of the target space.

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FEM을 이용한 유정압테이블의 운동정밀도 해석 (Finite Element Analysis on the Motion Error of Hydrostatic Table)

  • 박천홍;정재훈;이후상;김수태
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 춘계학술대회 논문집
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    • pp.658-662
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    • 2000
  • In order to achieve systematical method for improving motion accuracy of hydrostatic table, an algorithm using finite element method is proposed in this paper. Quantification of averaging effect of oil film on motion error is performed theoretically by analysis on the relationship between spacial frequency of rail form error and motion error of table. Influences of film stiffness and pocket size on the motion error of table are also analyzed theoretically Validity of the algorithm is verified experimentally from the test on the motion error of table with three types of rail which have different form profile. Experimental results show that the algorithm is very effective to analyze theoretically the motion error of hydrostatic table.

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FEM을 이용한 유정압테이블의 운동정밀도 해서(1. 단면지지형 테이블의 해석 및 실험적 검증) (Finite Element Analysis on the Motion Accuracy of Hydrostatic Table(1.st. Analysis and Experimental Verification on Single-side Table))

  • 박천홍;정재훈;이후상;김수태
    • 한국정밀공학회지
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    • 제17권12호
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    • pp.137-144
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    • 2000
  • In order to achieve systematical method for improving motion accuracy of hydrostatic table, an algorithm using finite element method is proposed in this paper. Quantification of averaging effect of oil film on motion error is performed theoretically by analysis on the relationship between spacial frequency of rail form error and motion error of table. Influences of film stiffness and pocket size on the motion error of table are also analyzed theoretically. Validity of the algorithm is verified experimentally from the test on the motion error of table with three types of rail which have different form profile. Experimental results show that the algorithm is very effective to analyze theoretically the motion error of hydrostatic table.

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전달함수를 이용한 유정압테이블 운동정밀도 해석법의 제안 및 이론적 검증

  • 오윤진;박천홍;이후상;홍준희
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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    • pp.9-14
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    • 2001
  • A new model utilizing a transfer function is introduced in the present paper for analizing motion errors of hydrostatic tables. Relationship between film reaction force in a single hydrostatic pad and form error of a guide rail is derived at various spacial frequencies by finite element analysis, and it is expressed as a transfer function. This transfer function clarifies so called averaging effect of the oil film quantitively. For example, it is found that the amplitide of the film reaction force is reduced as the spacial frequency increases or relative width of the pocket is reduced. Motion errors of a multiple pad table is estimated from transfer function, geometric relationship between each pads and form errors of a guide rail, which is named as Transfer Function Method. Calculated motion errors by TFM show good agreement with motion errors calculated by Multi Pad Method, which is considered entire table as an analysis object. From the results, it is confirmed that the proposed TFM is very effective to analyze the motion errors of hydrostatic tables.

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웨이브릿 계수의 퍼지 동질성과 고주파 에너지를 이용한 영상 검색용 특징벡터 추출 (Visual Feature Extraction for Image Retrieval using Wavelet Coefficient’s Fuzzy Homogeneity and High Frequency Energy)

  • 박원배;류은주;송영준
    • 한국콘텐츠학회논문지
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    • 제4권1호
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    • pp.18-23
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    • 2004
  • 본 논문에서는 공간주파수 특성과 다중 해상도 특성을 모두 갖는 웨이브릿 변환을 이용하여 각 대역의 특성에 맞는 비주얼 특징을 추출하고 이를 내용기반 영상 검색에 이용하는 새로운 방법을 제시하였다. 웨이브릿 변환된 영상의 최저주파 대역은 원 영상의 근사한 형태로 공간 정보를 충분히 활용할 수 있다. 이를 위해 웨이브릿 계수값과 각 계수간의 공간 정보를 모두 고려한 퍼지 동질성(FH : Fuzzy Homogeneity)를 이용하여 L개의 특징 벡터를 추출하였고, 나머지 고주파 대역의 에너지 값을 이용하여 3개의 특징 벡터를 추출하여 이를 영상 데이터베이스에 저장한다. 질의 시에는 L개의 FH 벡터 중 가장 크기가 큰 10개의 값과 3개의 고주파 대역의 에너지 값을 이용하여 가장 유사한 영상을 검색하였다. 90개의 텍스쳐 영상을 사용해 실험한 결과 좋은 정확성을 보였다.

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웨이블릿 영역에서 부대역간 트리구조의 에너지 분포에 의한 디지털 워터마크 삽입 알고리즘 (Digital Watermark Algorithm Based on Energy Distribution of Subband Tree Structure in Wavelet Domain)

  • 서영호;최순영;박진영;김동욱
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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    • pp.85-88
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    • 2002
  • In this paper, the proposed watermark algorithm is based on energy distribution of the subband coefficients in the frequency domain and edge of the original image in the spacial domain. Out of these information, the KeyMap which decides the embedded position of watermark is produced. And then the binary watermark is embedded into the wavelet coefficient of LL3 subband using KeyMap and LFSR(Linear Feedback Shift Register).

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전달함수을 이용한 유정압테이블 운동정밀도 해석법의 제안 및 이론적 검증 (Proposal and Theoretical Verification on Motion Error Analysis Method of Hydrostatic Tables Using Transfer Function)

  • 박천홍;오윤진;이찬홍;홍준희
    • 한국정밀공학회지
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    • 제19권5호
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    • pp.56-63
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    • 2002
  • A new model utilizing a transfer function is introduced in the present paper for analizing motion errors of hydrostatic tables. Relationship between film reaction force in a single hydrostatic pad and form error of a guide rail is derived at various spacial frequencies by finite element analysis, and it is expressed as a transfer function. This transfer function clarifies so called averaging effect of the oil film quantitively. For example, it is found that the amplitide of the film reaction farce is reduced as the spacial frequency increases or relative width of the pocket is reduced. Motion errors of a multiple pad table is estimated from transfer function, geomatric relationship between each pads and form errors of a guide rail, which is named as Transfer Function Method(TFM). Calculated motion errors by TFM show good agreement with motion errors calculated by Multi Pad Method, which is considered entire table as an analysis object. From the results, it is confirmed that the proposed TFM is very effective to analyze the motion errors of hydrostatic tables.

보행동작에 대한 바이오메카닉스적 분석과 비디오의 정성적 분석의 상호관련성 (Relationship between the Biomechanical Analysis and the Qualitative Analysis of Video Software for the Walking Movement)

  • 배영상;우오구;이정민
    • 한국운동역학회지
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    • 제20권4호
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    • pp.421-427
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    • 2010
  • The purpose of this study was to investigate the relationship between the quantitative analysis of biomechanical movement and the qualitative analysis of video software in order to evaluate for the walking movement. The fourteen collegiate students who agreed with the purpose and method of this study participated as subjects. The slow walking and fast walking of the subjects in the place of experiment were photographed, and calculated several mechanical factors. This empirical evidence from the experiment indicated the significant difference(p<.001) between each distant factors of the walking movement for both analyses methods, but there was no statistically significant difference between the spacial factors observed in the experiment. For more detail, no significant difference between the walking ratios that expressed the coordination between stride length and stride frequency was found. The findings also indicated the high coefficient of correlation(over r=.9) which supports higher explanation force for the biomechanical method and the Dartfish video software method. Therefore, if the data was gathered by using the proper experimental method, the video software method could be used just like the quantitative data of biomechanical method.

우리나라 연최대치 강우량 계열 및 확률강우량의 변화 특성 (Variation Characteristics of Annual Maximum Rainfall Series and Frequency-Based Rainfall in Korea)

  • 김재형
    • 한국습지학회지
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    • 제4권2호
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    • pp.43-56
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    • 2002
  • About 12 rain gauge stations of Korea, annual maximum rainfall series of before and after 1980 whose durations are 1, 2, 3, 6, 12, 24, 48, 72 hours respectively were composed and statistical characteristics of those time series were calculated and probability rainfall were estimated by L-moment frequency analysis method and compared each other in order to investigate the recent quantitative rainfall variations. And also, distribution curves of each statistical variations for each duration were constructed by using Kigging method to look into spacial rainfall variation aspects. As a result, We could confirm recent rainfall increase in the South Korea. And spatial increase pattern of standard deviation and frequency rainfall appeared analogously each other. 1n the cases of comparatively short rainfall duration, we could see relatively low increase or decrease tendency in Chungchong Province, Cholla-bukdo, Cholla-namdo eastern part, Kyongsang-namdo western part area. While, variations happened great1y in seaside district of east coast, southwest seashore, Inchon area etc. In the cases of longer durations relatively low increase was showed in southern seashore such as Yeosoo area and as distance recedes from this area, showed gradually augmented tendency. The aspect of mean looks similar tendency of above except that the variation rate of almost seaside district are big in the case of shorter durations. In addition, rainfall increases of short durations which became the center of hydrologist and meteorologist are unconfirmed in this study.

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