• Title/Summary/Keyword: correlation length

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Absolute phase identification algorithm in a white light interferometer using a cross-correlation of fringe scans (백색광 간섭기에서 간섭 무늬의 상호 상관관계 함수를 이용한 절대 위상 측정 알고리즘)

  • Kim, Jeong-Gon
    • Journal of Sensor Science and Technology
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    • v.9 no.4
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    • pp.316-326
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    • 2000
  • A new signal processing algorithm for white light interferometry has been proposed and investigated theoretically. The goal of the algorithm is to determine the absolute optical path length of an interferometer with very high precision (<< one optical wavelength). The algorithm features cross-correlation of interferometer fringe scans and hypothesis testing. The hypothesis test looks for a zero order fringe peak candidate about which the cross-correlation is symmetric minimizing the uncertainty of misidentification. The shot noise limited performance of the proposed signal processing algorithm has been analyzed using computer simulations. Simulation results were extrapolated to predict the misidentification rate at Signal to-Shot noise ratio (SNR) higher than 31 dB. Root-mean-square phase error between the computer-generated zero order fringe peak and the estimated zero order fringe peak has been calculated for the changes of three different parameters (SNR, fringe scan sampling rate, coherence length of light source). Results of computer simulations showed the ability of the proposed signal processing algorithm to identify the zero order fringe peak correctly. The proposed signal processing algorithm uses a software approach, which is potentially inexpensive, simple and fast.

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Precise Measurement Method and Error Analysis with Roughness Variables for Estimation of Scattering Coefficients (지표면 산란 계수 예측을 위한 정확한 지표면 거칠기 변수 측정 방법 및 오차 분석)

  • Kweon, Soon-Koo;Hwang, Ji-Hwan;Oh, Yisok;Hong, Sungwook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.1
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    • pp.91-97
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    • 2013
  • The input parameters of scattering models for computing the backscattering coefficients of earth terrains are mainly soil moisture and surface roughness. The backscattering coefficients of soil surfaces are more sensitive to surface roughness than soil moisture. In this study, we propose a precise measurement method for roughness parameters and analyze measurement errors. We measured surface roughness using a pin-board profiler(1 m, 0.5 cm interval) and a laser profiler(1 m, 0.25 cm interval). The measurement differences between two profilers in an average sense are 0.097 cm for root-mean-square (RMS) height and 1.828 cm for correlation length. The analysis of the correlation functions and relative errors shows that the laser measurements are more stable than the pin-board measurements. The differences of the calculated backscattering coefficients using a surface scattering model between pin-board and laser profiler measurements are less than 1 dB.

β-Carotene, Cucumisin Content and Fruit Morphology of Melon (Cucumis melo L.) Germplasm Collections

  • Kim, Yeong-Jee;Hwang, Ae-Jin;Noh, Jae-Jong;Wang, Xiaohan;Lee, Jae-Eun;Yoo, Eunae;Lee, Sookyeong;Hwang, Sojeong;Kim, Myung-Kon;Noh, Hyungjun
    • Korean Journal of Plant Resources
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    • v.34 no.6
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    • pp.555-565
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    • 2021
  • Melon fruits are a year-old plant in the family Cucurbitae and are the most cultivated fruit in tropical countries. Melon flesh is an important source of anti-cancer, antioxidant effects, attracting attention as a functional food. We investigated the morphological properties, β-carotene content, and cucumisin activity of seeds of 58 melon genetic resources. Melon resources have shown various morphological properties. Melons grouped by morphological properties were the five groups. β-carotene content varied between 82.34 mg/kg, 86.75 mg/kg, 25.56 mg/kg, 86.25 mg/kg, and 54.65 mg/kg. Between β-carotene, cucumisin activity and other quantitative fruit morphological properties, the color of the pulp and the firmness of the pulp had a significant amount of correlation between the β-carotene content. However, cucumisin activity and β-carotene content had significant negative correlation, and the color of the fruit and shape of the fruit had significant negative correlation with β-carotene content and activity of cucumisin. Our study vindicated that high diversity in melon morphological characters of genetic sources that provide beneficial baseline data for the future and in the activity of β-carotene and cucumisin, and these results could predict indicators of β-carotene content by the length of leaf, the width of fruit, the length of joint, and the length of seed, and collectively the morphological properties of melons could help predict indicators of β-carotene content and help develop functional sarcoma and farmhouse cultivation.

The Korean Word Length Effect on AudWord Recognition (청각단어 재인에서 나타난 한국어 단어 길이 효과)

  • Choi Wonil;Nam Kichun
    • MALSORI
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    • no.44
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    • pp.33-46
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    • 2002
  • This study was conducted to examine the effect of word length on auditory word recognition. Word length can be defined by several sublexical units, such as letters, phonemes, syllables, etc. To find out which sublexical units are influential in auditory word recognition, the auditory lexical decision task was used. In Experiment 1, we examined the partial correlation between the speed of reaction time and the number of sublexical units, and in Experiment 2, we executed ANOVA to find out which sublexical length variable was an influential unit. Through these two experiment, we concluded syllable length was the most important variable on auditory word recognition.

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Response to Selection for Milk Yield and Lactation Length in Buffaloes

  • Khan, M.S.
    • Asian-Australasian Journal of Animal Sciences
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    • v.10 no.6
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    • pp.567-570
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    • 1997
  • A multiple trait animal model having milk yield and lactation length was used to estimate genetic parameters using data from four institutional herds and four field recording centers. Response to selection for milk yield alone and in combination with lactation length was estimated by using principles of genetic theory. Lactation records (n = 2,353) adjusted for age at calving to 60 months were utilized. Milk yield was 17% heritable with repeatability of 0.44. Lactation length had a low heritability of 0.06 with repeatability of 0.16. Genetic correlation between the two traits was 0.70. Selection response in milk yield can be improved slightly (103.8 vs 102.8 kg) when information on covariance with lactation length is used together with the information on milk yield.

한국인 성인 남여의 발형태에 관한 연구

  • 이영숙
    • Proceedings of the ESK Conference
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    • 1996.04a
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    • pp.218-223
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    • 1996
  • The foot shape from the right and left feet was taken with 78 male and 213 female Korean subjects. The results are as follows. 1) Mean values and standard deviations of 25items concering the foot : Measurements performed on Korean adults(male and female) show that male left foot length is in average somewhat longer than the corresponding right foot length(25.35Cm against 25.32Cm) and on the contrary that the circumference of the left foot is slightly smaller than for the right foot. For the same tendency is verified in female feet. 2) Correlations between measurement items : Finding a correlation of more than 0.08 only between the foot length to suggest that the present system of ready-made "shoe" size system, based only on foot length, is not a quite appropriate system. 3) Distribution between foot width, foot girth, instep height and foot length : Foot length showed from 21.52Cm to 24.0Cm in the female subjects and from 24.0Cm to 26.5Cm in the male subjects for the standard type. Foot width showed from 7.5Cm to 10.0Cm in female and from 8.5Cm to 10.5Cm in male for the standard type.dard type.

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Shape Recognition of Parts and Software Development by using Border Tracking and Cross Correlatioin Method (경계선추적과 상관계수법을 이용한 부품의 형상인식과 소프트웨어개발)

  • 유성민
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.03a
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    • pp.100-105
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    • 1998
  • Image processing was used to recognize parts at various disposition. Non-transpatent tachometer panel for automobile and semi-transparent panel have been used as test specimen. Laplacian filter and various threshold values have been applied for preprocessing and edge following algorithm has been applied. Series of length data between edges have been generated from each image and compared using cross correlation coefficient. The result using cross correlation coefficient. The result using both edge following and cross correlation coefficient was proven to be the best fit for the proposed parts.

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Ananlysis of Correlation between Functional Leg Length Discrepancy caused by Pelvic tilting and Femur head height difference (골반변위와 대퇴골두 높이차이에 대한 상관성 비교 - Gonstead's Technique을 중심으로 -)

  • Lee, Kyung-Yun;Seo, Jin-Woo;Park, Kwae-Hwan;Park, Min-Jung
    • The Journal of Korea CHUNA Manual Medicine
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    • v.5 no.1
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    • pp.213-222
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    • 2004
  • Objectives : To investigate contributing degree of other factors except pelvic tilting to F.L.L.D by analizing with Gonstead technique on the correlation between femur head height discrepancy on the standing pelvic AP view and F.L.L.D caused by pelvic tilting. Method : We analysed standing pelvis AP X-ray of 70 patients who had visited at the department acupunture and moxibustion in Conmaul oriental medical hospital, during May, 1st, 2004 - July, 30th, 2004, with low back pain or lower extremity pain. We excluded the person with any past history of polio, genetic defect, malunited fracture, growth plate injury, infection and overgrowth attributable to hemangioma, or arteriovenous fistula. Results & Conclusion : The functional leg length discrepancy caused by pelvic tilting and femur head height difference had no statistical difference(p=0.132) but poorly correlated(Pearson ${\nu}=0.05$). In the 94.28% of subjects, the femur head height difference wasn't in accord with F.L.L.D. caused by pelvic tilting. In 47.14% of subjects were expected to have over $3^{mm}$ of leg length discrepancy after pelvic adjustment. The mean of measurement difference between two methods was $3.76{\pm}3.12^{mm}$ and the range was $0{\sim}11.4^{mm}$. Consequently, we must consider not only functional leg length discrepancy caused by pelvic tilting but also anatomical leg length discrepancy, misalignment of ankle, knee or hip joint etc.

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Effect of Sowing Depth on Coleoptile Length and Plant Height of Barley, Wheat, Rye and Corn (파종심도에 따른 맥류 및 옥수수의 초엽장과 초장의 변화)

  • 김흥배
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.39 no.3
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    • pp.232-236
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    • 1994
  • The term underground stem is not used correctly as mesocotyle that is the first internode of barley, wheat and rye. Mesocotyle does not elongate and it remain in the seed in case of these crops. The elongated stem is second internode of these crops and not mesocotyle but rhizome or underground stem. The node on which the underground stem is attached is coleoptile node and coleptile is attached here. The objective of this study was to determine if the depth of sowing affect the coleoptile length and plant height. The deeper sowing caused the longer coleoptile length and plant height. Coleoptile length and plant height of 2cm depth of sowing showed significant difference with 6cm and 10cm depth of sowing in barley and wheat. Variation of these two characters were high in rye and corn because these crops were both heterogeneous due to out crossing. All the varieties of 4 crops showed significant correlation between coleoptile length and plant height. Chilbohomil showed highly significant correlation between two characters.

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A Study on the Correlation of Cecal Anaerobic Bacterial Counts with Cecal Length in Growing Chicks (성장중인 닭에 있어서 맹장내의 혐기성 미생물수와 맹장 길이와의 관계에 관한 연구)

  • Son, J.H.
    • Korean Journal of Poultry Science
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    • v.29 no.4
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    • pp.255-258
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    • 2002
  • A study was conducted to investigate the correlation of cecal anaerobic bacterial counts with the cecal length in growing chicks. Half of 160 chicks of five weeks old were housed in cages and the remainings were kept with goats in free-range and allowed to have free access to goat's feed and faeces. All the experimental birds were fed ad libitum on a commercial chick formula diet during the period of 5 to 12 weeks of age. Body weight was larger in birds reared in the cage than in those reared on the field at 8 weeks of age (P<0.05), but vice versa at the end of experiment (P<0.05). The cecal length was longer in field-rearing than in cage-rearing at 6, 9, 10 and 11 weeks of age (P<0.05). The cecal length was correlated with body weight gain in both rearing groups (r=0.816 f3r cage-rearing, r=0.816 for field-rearing). The cecal anaerobic bacterial counts were significantly higher in field- rearing than in cage-rearing at 6, 9, 10 and 11 weeks of age (P<0.05). The cecal length was highly correlated with cecal anaerobic bacterial counts in cage- (r=0.9549) and field-(r=0.9866) rearing. It is concluded that the correlation of increase cecal length with increased cecal anaerobic bacterial counts ted a libelous of goat's faeces in growing chicks.