• Title/Summary/Keyword: data partition

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Physiochemical Properties and Antibacterial Activities of Metal Complexes of Norfloxacin (노르후록사신-금속이온 착물의 물리화학적 성질 및 항균력)

  • Park, Won-Bong;Kim, Kyung-Ah;Lee, Myung-Hwan;Lee, Dong-Sun;Rho, Dong-Yoon
    • YAKHAK HOEJI
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    • v.36 no.6
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    • pp.577-581
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    • 1992
  • Norfloxacin complexes of $Fe^{2+}$, $Cu^{2+}$ and $Al^{3+}$ have been prepared as solids. The stoichiometry of the complexes has been established. IR investigation indicates the metal-ligating sites in norfloxacin. The bioactivities of complexes all lower than that of norfloxacin. The solubilities and partition coefficients have been measured as a function of temperature. The data are used to evaluate the thermodynamic parameters ${\Delta}G$, ${\Delta}H$, ${\Delta}S$ for the solute transfer process and compared with the parent quinolone, norfloxacin. The existence of such complexes is discussed in the light of quinolone mode-of-action theories.

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Effects of Gasoline Additive, Methyl tert-Butyl Ether (MTBE) to Human Health and Ecosystem (가솔린첨가제 MTBE의 인체 및 생태영향)

  • An Youn-Joo;Lee Woo-Mi
    • Environmental Analysis Health and Toxicology
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    • v.21 no.2 s.53
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    • pp.93-102
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    • 2006
  • Methyl tert-butyl ether (MTBE), an octane booster that is added to the reformulated gasoline, has been a widespread contaminant in aquatic ecosystem. MTBE is a recalcitrant pollutant having low biodegradability. Due to its higher water solubility and low octanol-water partition coefficient, it can be rapidly transported to the surrounding water environment. Also, MTBE is a known animal carcinogen, and is classified as a possible human carcinogen by U. S. Environmental Protection Agency. The adverse effect of MTBE to aquatic biota was widely reported. In Korea, the recent detection of MTBE in groundwater near gasoline filling stations has drawn concern to public health and ecosystem. To address this concern, the effect of MTBE to human health and ecosystem was discussed in this review. Also, ecotoxicity data of MTBE for fish, invertebrates, and algae were extensively compared to estimate the hazard concentration 5($HC_5$) of MTBE as a screening level.

Iterative SAR Segmentation by Fuzzy Hit-or-Miss and Homogeneity Index

  • Intajag Sathit;Chitwong Sakreya;Tipsuwanporn Vittaya
    • Proceedings of the KSRS Conference
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    • 2004.10a
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    • pp.111-114
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    • 2004
  • Object-based segmentation is the first essential step for image processing applications. Recently, SAR (Synthetic Aperture Radar) segmentation techniques have been developed, however not enough to preserve the significant information contained in the small regions of the images. The proposed method is to partition an SAR image into homogeneous regions by using a fuzzy hit-or-miss operator with an inherent spatial transformation, which endows to preserve the small regions. In our algorithm, an iterative segmentation technique is formulated as a consequential process. Then, each time in iterating, hypothesis testing is used to evaluate the quality of the segmented regions with a homogeneity index. The segmentation algorithm is unsupervised and employed few parameters, most of which can be calculated from the input data. This comparative study indicates that the new iterative segmentation algorithm provides acceptable results as seen in the tested examples of satellite images.

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A Study on Office Workers' Preference for Spatial Characteristics of Home Office (재택근무 희망 근로자의 재택 근무 공간 특성에 대한 선호 연구)

  • 신화경
    • Journal of the Korean housing association
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    • v.12 no.2
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    • pp.87-95
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    • 2001
  • The number of people working in their own home has been increasing, and this will change the form of house. Therefore, it is necessary to plan the new house for the people working at home, and to offer business related working area. This study was designed to know the office workers preference for spatial characteristics of home office. Data were collected through a questionnaire survey. The subject were 257 office workers living in Seoul area. Frequency, percentage, and MM2 : $\textrm{X}^2$-test were used. The results showed that the place for home-office should be located independently inside house. The desirable size for the home-office might be 3-4 pyung. If the place for home-office share with other places, livingroom of bedroom, it is necessary to develop furniture and partition matching with residential furniture and atmosphere. Office workers prefer U-shaped workstation and coner-shaped workstation.

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Plug Manufacturing of Leisure Boats through the NC Processing (NC가공을 통한 레저보트의 플러그 제작)

  • Park, Gen-Ong
    • Journal of the Society of Naval Architects of Korea
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    • v.47 no.4
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    • pp.606-612
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    • 2010
  • This study took advantage of NC processing technique in order to recreate design in development process of leisure boat based on the Korean boats and ships. CNC milling is an area which is concerned in automation process of boat production and needs sophisticated software, equipment and professionals to pilot it. The progress of manufacture begins when the surface model creation and simulation being done using CAD/CAM software. In this process, the needs such as 3D design, NC processing data, plug lamination and partition processing appear as detailed steps. The study completed these detailed steps and also the application example has been studied with presenting engineering potentialities.

A Study on The Performance Analysis of Partition Multistage Interconnection Network (분할된 다단상호접속망의 성능 분석에 관한 연구)

  • 김영선;최진규
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.14 no.6
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    • pp.675-685
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    • 1989
  • The interconnection network is an integral part of parallel processing system. The multistage interconnection networks(MINs) have been the objects of intense research in recent years. In this paper, simulation techniques for circuit switchign MIN are extended to allow the performance evaluation of partitioned ADM/IADM network. Based on simulation data, the relationship between the netwrok performance, the partitioning scheme employed, and the conflict resolution strategies used within the network is enumerated. It is shown that IADM network coupled with the use of the hold strategy produces the best network operation in terms of RST (Request Service Time).

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An Experimental Study on Standard Establishment of Sump Model Test in Pump Station (펌프장 Sump 모델 시험기준 수립을 위한 실험 연구)

  • Lee, L.Y.;Kim, B.S.;Lee, D.G.;Oh, Y.M.
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.582-588
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    • 2005
  • An experimental study to establish a standard of sump model test of pump station was implemented. Comparison of foreign standard was also performed. Configuration condition around a bell mouth suction intake was easily adjusted by 3-axis traversing system and partition allocation. Operational condition was also varied widely to give accurate test data. PIV was also introduced to produce Quantitative analysis of flow field such as free-surface vortex and submerged vortex occurring in the model test. More detailed vortex behaviors were represented by PIV analysis.

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Chemical Constituents of Fermented Noni (Morinda citrifolia) Juice Exudates and Their Biological Activity

  • Youn, Ui Joung;Chang, Leng Chee
    • Natural Product Sciences
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    • v.23 no.1
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    • pp.16-20
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    • 2017
  • In a continuing study of the fermented noni (Morinda citrifolia) juice exudates, five compounds, heptanyl $2-O-{\beta}-{\small{D}}-xylofuranosyl-(1{\rightarrow}6)-{\beta}-{\small{D}}-glucopyranoside$ (1), n-butyl ${\beta}-{\small{D}}-glucopyranoside$ (2), (1S)-(3-ethenyl-phenyl)-1,2-ethanediol (3), (2S)-2-hydroxybutanedioic acid (4), and daucosterol (5) were isolated from the buthanol partition of the extract. The structures of the isolates were identified by 1D and 2D NMR, and MS experiments, as well as by comparison of their data with the published values. Among the isolates, compounds 1 - 3 were isolated for the first time from the plant species. The isolated compounds were evaluated for their cancer chemopreventive potential based on their ability to inhibit nitric oxide (NO) production and tumor necrosis factor alpha ($TNF-{\alpha}$)-induced $NF-{\kappa}B$ activity, and quinonone reductase-1 (QR1)-inducing effect.

Transient State Theory of Significant Liquid Structure applied to Binary Mixture, Benzene-Cyclohexane (이성분 액체 혼합물의 통계열역학적 연구)

  • Ahn, Woon-Sun
    • Journal of the Korean Chemical Society
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    • v.10 no.3
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    • pp.136-142
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    • 1966
  • The Transient State Theory of Significant Liquid Structure has been successfully extended to binary mixture, benzene-cyclohexane system, which gives positive deviation from Raoult's law. The partition function has been derived, and from it various thermodynamic properties, such as total and partial vapor pressures, molar volumes, and excess entropies have been calculated at the temperatures $303.15^{\circ},\;\313.15^{\circ},\;and\;343.15^{\circ}K$. The calculated values agree satisfactorily with the experimental data.

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Exploring students' thinking in proof production in geometry (기하 증명 구성에 나타나는 학생들의 사고과정 탐색)

  • An, SunYoung;Kim, Gooyeon
    • The Mathematical Education
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    • v.53 no.3
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    • pp.383-397
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    • 2014
  • This study aims to explore secondary students' thinking while doing proof in geometry. Two secondary students were interviewed and the interview data were analyzed. The results of the analysis suggest that the two students similarly showed as follows: a) tendencies to use the rules of congruent and similar triangles to solve a given problem, b) being confused about the rules of similar and congruent triangles, and c) being confused about the definitions, partition and hierarchical classification of quadrilaterals. Also, the results revealed that a relatively low achieving student has tendency to rely on intuitive information such as visual representations.