• 제목, 요약, 키워드: Quantitative fluctuation

검색결과 69건 처리시간 0.032초

Nonclassical Chemical Kinetics for Description of Chemical Fluctuation in a Dynamically Heterogeneous Biological System

  • Lim, Yu-Rim;Park, Seong-Jun;Lee, Sang-Youb;Sung, Jae-Young
    • Bulletin of the Korean Chemical Society
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    • v.33 no.3
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    • pp.963-970
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    • 2012
  • We review novel chemical kinetics proposed for quantitative description of fluctuations in reaction times and in the number of product molecules in a heterogeneous biological system, and discuss quantitative interpretation of randomness parameter data in enzymatic turnover times of ${\beta}$-galactosidase. We discuss generalization of renewal theory for description of chemical fluctuation in product level in a multistep biopolymer reaction occurring in a dynamically heterogeneous environment. New stochastic simulation results are presented for the chemical fluctuation of a dynamically heterogeneous reaction system, which clearly show the effects of the initial state distribution on the chemical fluctuation. Our stochastic simulation results are found to be in good agreement with predictions of the analytic results obtained from the generalized master equation.

여수연안 낭장망에 어획된 어류의 종조성 및 양적변동 (Species composition and quantitative fluctuation of fishes collected by gape net in coastal waters of Yeosu, Korea)

  • 한경호;오용석
    • 수산해양기술연구
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    • v.43 no.4
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    • pp.261-273
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    • 2007
  • To analyze quantitative fluctuation in abundance and species composition in coastal waters of Dolsan, Yeosu, the fished were collected by gape net from March to November, 2000. The fish species caught by set net collected fishes were identified 63 species, 56 families, 42 orders, and the number of appearance and biomass was 2,230,297 individuals and 16,076.8kg. The most dominant orders were Perciformes, Clupeiformes and Tetraodontiformes which accounted for 71.4% of the total. The dominant species in number were Engraulis japonicus, Sardinops melanostictus, Trichiurus lepturus which accounted for 99.2% (2,211,642 individuals) of the total fishes collected. The dominant species in biomass were Engraulis japonicus which accounted for 79.7% (12,807g) of the total fishes collected. Temporal occurence of the dominant species such as the Engraulis japonicus, Sardinops melanostictus, Trichiurus japonicus, Ilisha elongata, Leiognathus nuchalis was closely correlated with water temperature, which is expressed as following regression equation, $y=0.0864x-0.2311(r^2=0.3516)$. The species collected during the sampling yearly period were Engraulis japonicus, and migratory fish were Ilisha elongata, Trichiurus japonicus, Scomberomorus nipphnius, Scomber japonicus, Konosirus punctatus, Sphyraena pinguis, Pseudosciaena polyactis.

영상신호의 시가지 이동수신에 의한 화상열화요인의 평가법에 관한 연구 (A Study on Picture Quality Impairing Factors and Evaulation Method for The Video Signal in Urban Mobile Reception)

  • Deock Ho Ha
    • 전자공학회논문지A
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    • v.30A no.3
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    • pp.52-60
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    • 1993
  • Fluttering ghost which is the most severs picture impairment in mobile TV reception under multipath fading environments can be detected by measuring the dynamic variation of the synchronizing pulse timing. And also, the occurrence-stucture of fluttering ghost are directly correlated with the multipath parameters. This paper describes the quantitative evaluating method of the mobile TV pictures impaired by multipath parameters by means of the spectral analysis of synchronizing timing fluctuation. The ghost-flutter curve derived from the spatial amplitue spectrum of synchronizing pulse timing fluctuation express well the spatial variation characteristic, and it has been found to be the quantitative evaluating measure of picture impairment in mobile reception. A correspondence between the ghost-flutter curve (and/or index) and picture quality opinion test results is established.

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황해 중부에서 저층 트롤에 어획된 어류의 종조성 및 양적변동 (Quantitative Fluctuation and Species Composition of the Fish by Bottom Trawl in the Middle of Yellow Sea, Korea)

  • 주현;추보라;이성훈;유태식;한경호
    • 한국해양바이오학회지
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    • v.12 no.1
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    • pp.59-65
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    • 2020
  • Fish, caught by bottom trawling in the middle of the Yellow sea (east of Korea), in the spring and summer of 2016 were assessed for species composition and fluctuation in their abundance. The fish were studied at four research stations (St.) and were found to be composed of 46 species, 31 families, and 14 orders. The dominant species caught were Engraulis japonicus, Larimichthys polyactis, Johnius grypotus, Liparis tanakae, and Larimicthys crocea. All the species were assessed for their numbers, richness, diversity, and dominance to gain a measure of the biodiversity. The highest number of individuals was recorded at St. 4 (50,053 individuals), while the lowest number of individuals was recorded at St. 1 (44,090 individuals). The evenness index was the highest at St. 2 (E = 0.65) and lowest at St. 3 (E = 0.62). The diversity index was the highest at St. 4 (H' = 2.31) and lowest at St. 3 (H' = 2.23). Furthermore, the dominance index was the highest at St. 3 (D = 54.9%) and lowest at St. 2 (D = 47.7%).

대구 지하철 사고에 따른 화재 의식조사 및 방재의식 변동모형에 관한 연구 (A Study on the Resident's Understanding Analysis of Fire Disaster and the Fluctuation Modeling of Disaster Prevention Caused by Daegu Subway Accident)

  • 이상호;이재복
    • 한국화재소방학회논문지
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    • v.17 no.3
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    • pp.45-49
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    • 2003
  • 본 연구는 2003년 2월 18일 대구에서 발생한 지하철 사고에 대한 네티즌의 의견을 토대로 사회의 방재의식을 조사 및 분석하고자 하였다. 분석된 자료를 통하여 방재의식 저하곡선을 모형화함으로써 방재의식을 정량적으로 분석할 수 있었으며 본 연구는 금후 지속적인 방재교육의 정착화에 유효하게 이용될 것이다.

Morphological Discretion of Basidiospores of the Puftball Mushroom Calostoma by Electron and Atomic Force Microscopy

  • Kim, Mi-Sun;Kim, Ki-Woo;Jung, Hack-Sung
    • Journal of Microbiology and Biotechnology
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    • v.17 no.10
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    • pp.1721-1726
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    • 2007
  • Comparative morphology among species of the genus Calostoma, including C. cinnabarina, C. ravenelii, and C. japonicum, was investigated by scanning electron microscopy and atomic force microscopy. Spore morphology of C. cinnabarina and C. ravenelii showed no dramatic differences by light microcopy and scanning electron microscopy. To differentiate these species, atomic force microscopy was employed. Quantitative analysis of the surface roughness of basidiospores revealed subtle differences in height fluctuation at the nanometer scale between the species of Calostoma. Basidiospores of C. cinnabarina had a relatively rougher surface than those of C. ravenelii at $2.0{\times}2.0\;{\mu}m^2$ scan areas.

주행 구동 유니트의 가속 수명 시험 및 분석 (Accelerated Life Test and Analysis of Track Drive Unit for an Excavator)

  • 이용범;박종호
    • 유공압시스템학회논문집
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    • v.2 no.2
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    • pp.1-7
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    • 2005
  • For the reliability evaluation of the track drive unit(TDU), firstly, we analyzed the major failure modes through FMEA(failure mode & effects analysis), FTA(failure tree analysis), and 2-stage QFD(quality function deployment), and then quantitatively determined the priority order of test items. The Minitab analysis was also performed for prediction of life distribution and parameters of TDU by use of field failure data collected from 430 excavators for two years. In addition, we converted the fluctuation load in field conditions into the equivalent load, and for evaluation of the accelerated lift by the cumulative fatigues, the equivalent load is again divided into the fluctuation load by reference of test time. And then, by use of the test method in this paper, the acceleration factor(AF) of needle bearing inside planetary gear which is the most weakly designed part of TDU is achieved as 5.3. This paper presents the quantitative selection method of test items for reliability evaluation, the determination method of the accelerated life test time, and the method of non-failure test time based on a few of samples. And, we proved the propriety of the proposed methods by experiments using a TDU for a 30 ton excavator.

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Robust Active Power Control of a Battery-Supported DSTATCOM to Enhance Wind Generation Power Flow

  • Mahdianpoor, Mohammad;Kiyoumarsi, Arash;Ataei, Mohammad;Hooshmand, Rahmat-Allah
    • Journal of Electrical Engineering and Technology
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    • v.12 no.4
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    • pp.1357-1368
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    • 2017
  • The lack of controllability over the wind causes fluctuations in the output power of the wind generators (WGs) located at the wind farms. Distribution Static Compensator (DSTATCOM) equipped with Battery Energy Storage System (BESS) can significantly smooth these fluctuations by injecting or absorbing appropriate amount of active power, thus, controlling the power flow of WGs. But because of the component aging and thermal drift, its harmonic filter parameters vary, resulting in performance degradation. In this paper, Quantitative Feedback Theory (QFT) is used as a robust control scheme in order to deactivate the effects of filter parameters variations on the wind power generation power smoothing performance. The proposed robust control strategy of the DSTATCOM is successfully applied to a microgrid, including WGs. The simulation results obviously show that the proposed control technique can effectively smooth the fluctuations in the wind turbines' (WT) output power caused by wind speed variations; taking into account the filter parameters variations (structural parameter uncertainties).

동력형 욕창예방제품의 교대부양 압력 프로파 특성 (Alternating Pressure Profile Characteristics of Powered Pressure Ulcer Preventing Devices)

  • 원병희;송창섭
    • Journal of the Ergonomics Society of Korea
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    • v.29 no.4
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    • pp.639-646
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    • 2010
  • The APAM's quantitative effectiveness and comparative study in preventing and treating pressure ulcer has not been sufficiently evaluated mainly because of uncertainty of pressure load input and lack of interpretation of dynamic perfusion recovery characteristics of soft tissue. The purpose of this paper was to quantify and analyze the alternating pressure characteristics of APAM as a preventive measure for pressure ulcers. To quantify the alternating load to human body, we introduced alternating pressure profile concept and developed parametric model of the profile. Regarding pressure level and cycle time, 3 global and 7 local periodic parameters were used to define the profile such as light, standard, typical and heavy duty profile shape. Pressure impulse ratio of light duty is the lowest but pressure fluctuation is significantly high. For the same duty shape, contact conditions are changed with alternating cycle time and more dramatically in shorter alternating cycle time conditions. We can conclude that if we use shorter alternating cycle time on APAM's operation we can get more positive effects regarding to inflated contact time condition. We proposed the quantitative methods on tissue viability study of external loading by simultaneous measurement of interface pressure and tissue perfusion with proper alternating pressure profile conditions.

Fuzzy-Weighted Score를 이용한 쾌적감성 평가모형 (Modeling for Evaluating the Comfort Sensibility using Fuzzy-Weighted Score)

  • 전용웅;조암
    • 산업공학
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    • v.18 no.2
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    • pp.158-166
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    • 2005
  • Human-error and mental stress caused by psychophysiological dissonance between people and artificial environments have become a social problem. And it is a common knowledge that comfort environment reduces human-error and mental stress. Comfort sensibility is related to complex interactions between fabric, climatic, physiological and psychological variables. Currently, comfort sensibility has been evaluated by many sensory tests. However, it is difficult to evaluate comfort sensibility because a concrete concept of comfort sensibility is hard to define. In this paper, we propose a model to evaluate the comfort sensibility using Fuzzy-weighted score on an individual's subjective state for the stimulus. To represent the degree of comfort sensibility level for the stimulus, we represent comfort sensibility using 2 dimensional sensibility vector model. And we use the fuzzy-weighted score that is a fuzzy version of the weighted checklist technique computerized for evaluating the subjects. As an example, this model is applied to 1/f fluctuation sound evaluation. The results show that this model can be effectively used to the quantitative evaluation of comfort sensibility for the stimulus.