• Title, Summary, Keyword: action properties

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SOME PROPERTIES ON SPACES WITH NONCOMPACT GROUP ACTION

  • Lee, Hyang-Sook;Shin, Dong-Sun
    • Communications of the Korean Mathematical Society
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    • v.12 no.3
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    • pp.717-723
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    • 1997
  • The compact transformation group has been developed with lots of properties. Many properties which are satisfied on G-space for compact group G do not hold for noncompact case. To recover some theory on spaces with noncompact group action we give some restriction on G-spaces. Hence we introduced Cartan G-spaces and proper G-spaces for our goal and we prove some properties on these G-spaces with noncompact G.

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EXPERIMENTAL STUDY ON THE ANTIBACTERIAL PROPERTIES OF DILUTE FORMOCRESOL AND EUGENOL AND PROPYLENE GLYCOL (희석 Formocresol과 Eugenol의 살균효과에 관한 실험적 연구)

  • Yoon, Soo-Han
    • Restorative Dentistry and Endodontics
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    • v.7 no.1
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    • pp.47-52
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    • 1981
  • The purpose of this study is to determine the antibacterial effect of Dilute Formocresol and Eugenol and Propylene glycol. The experimental drugs are Formocresol in Propylene glycol (5, 10, 20%) and Eugenol in Propylene glycol (50, 75, 100%) and Propylene glycol. The organisms selected for study were Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus subtilis which are found in infected root canals and are highly resistant to antiseptics. Isolated bacteria were inoculated on blood agar plate and the plates were incubated at $37^{\circ}C$ for 18 hours and the zones of inhibition then measured. The results were as follows ; 1. The antibacterial action of Formocresol was effective even at 5-10 percent and the action increased when higher concentration was used. 2. The antibacterial action of Eugenol was not effective and the action decreased when higher concentration was used. 3. Propylene glycol itself possessed some antibacterial properties and showed that the antibacterial action of Propylene glycol might be almost the same as that of Eugenol. 4. Among the experimental organisms, Pseudomonas aeruginosa was found to be the most resistant to all the experimental drugs.

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A Coordinate System of Classification for Effective Visualizations of Story Properties (스토리 창작 특성의 효과적 가시화를 위한 분류 좌표계 연구)

  • Kim, Myoung-Jun
    • Journal of Digital Contents Society
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    • v.18 no.6
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    • pp.1119-1125
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    • 2017
  • Genres and actions of stories can be used to classify stories, and used effectively as well for visualizing story properties. This paper proposes a Genre-Action coordinate system for visualizing story property data in 2-dimension that has similarities between the genre and action items along the axes, i.e. a property of spatial continuum. With the proposed Genre-Action coordinate system we found that the genre and action items in the axes are arranged according to their similarities and we were able to achieve a spatially meaningful visualization of story properties where the related data form clusters.

Freeze-Thaw Resistance of Blended Cement Concrete using Seawater (해수를 사용한 혼합시멘트계 콘크리트의 동결융해 저항성)

  • 문한영;김성수;이승태;김종필;박광필
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.725-730
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    • 2002
  • The durability of concrete involves resistance to freeze-thaw action, corrosion, permeation, carbonation, chemical attack and so on. Generally, properties of concrete have been well understood under the separate action of these deterioration mechanisms. However, in practice, the degradation of concrete usually is the result of combined action of physical and chemical attack and can be accelerated by the combined action of several deterioration mechanisms. In the present study, to evaluate the combined deterioration by freeze-thaw action and seawater attack, ground granulated blast-furnace slag or silica fume concrete with water or seawater as mixing water was exposed to 210 cycles of freeze-thaw action. Tests were conducted to determined the relative dynamic modulus of elasticity and compressive strength. Furthermore, The XRD, SEM and EDS analysis were performed on the deteriorated part of concrete due to freeze-thaw action and seawater attack.

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Freeze-Thaw Resistance and Void Characteristic of Blended Cement Concrete using Seawater (해수를 사용한 혼합시멘트계 콘크리트의 동결융해 저항성 및 공극특성)

  • Kim, Seong-Soo;Lee, Seung-Tae;Jung, Ho-Seop;Park, Kwang-Pil
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.589-592
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    • 2006
  • The durability of concrete involves resistance to freeze-thaw action, corrosion, permeation, carbonation, chemical attack and so on. Generally, properties of concrete have been well understood under the separate action of these deterioration mechanisms. However, in practice, the degradation of concrete usually is the result of combined action of physical and chemical attack and can be accelerated by the combined action of several deterioration mechanisms. In the present study, to evaluate the combined deterioration by freeze-thaw action and seawater attack, ground granulated blast-furnace slag or silica fume concrete with water or seawater as mixing water was exposed to 300 cycles of freeze-thaw action. Tests were conducted to determined the relative dynamic modulus of elasticity and compressive strength. Furthermore, The MIP analysis were performed on the deteriorated part of concrete due to freeze-thaw action and seawater attack.

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Isoquinolines: Are they possible candidate for $Ca^{2+}$ blockers\ulcorner

  • 장기철;윤용진;조수동;정원석
    • Proceedings of the Korean Society of Applied Pharmacology
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    • pp.217-217
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    • 1994
  • Calcium entry blockers, capable of inhibiting transmembrane influx of extracellular calcium through specific calcium channels, are useful drugs in the treatment of angina pectoris, hypertension, cardiac arrythmia, and various cardiovascular disorders. Compounds having isoquinoline structures have recently been reported to possess calcium antagonistic action. Therefore, in the present study, we have attempted to synthesize some isoquinoline and related compound.; in order to search for potentially effective chemicals acting on cardiovascular system, and evaluated their pharmacological properties focusing on calcium antagonistic actions. Almost all of the compounds so far synthesized, had inhibitory action against phenylephrine or high potassium-induced contraction in vascular smooth muscle with different degrees of potencies depending on their structures, However, some of tetrahydroisoquinoline analogs showed directly inhibit calcium current in isolated rabbit cardiac myocytes examined by patch clamp techniques. The pharmacological properties of these compounds need more intensive investigation as to whether these chemicals may have developed as a new cardiovascular active drugs. Therefore, we are now under investigation of the mechanism of action of these compounds.

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The Growth and Behavior of a Virtual Life by using Genetic Algorithm

  • Kwon, Min-Su;Kim, Do-Wan;Hoon Kang
    • Journal of Korean Institute of Intelligent Systems
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    • v.13 no.5
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    • pp.621-626
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    • 2003
  • In this paper, we modeled a virtual life (VL) that reacts to the user s action according to its own behavioral characteristics and grows itself. We established some conditions with which such a VL is designed. Genetic Algorithm is used for the growth process that changes the VL s properties. In this process, the parameter values of the VL s properties are encoded as one chromosome, and the GA operations change this chromosome. The VL s reaction to the user s action is determined by these properties as well as the general expectation of each reaction. These properties are evaluated through 5 fitness measures so as to deal with multi-objective criteria. Here, we present the simulation of the growth Process, and show some experimental results.

The Growth Process of Interactive Virtual Life using Genetic Algorithm

  • Kwon, Min-Su;Kim, Do-Wan;Hoon Kang
    • 제어로봇시스템학회:학술대회논문집
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    • pp.89.2-89
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    • 2002
  • In this paper, we modeled a virtual life (VL) that react to the user's action according to its own behavioral characteristics and grows itself. We established some conditions with which such a VL is designed. Genetic Algorithm is used for the growth process that changes the VL's properties. In this process, the parameter values of the VL's properties are encoded as ore chromosome, and the GA operations change this chromosome. The VL's reaction to the user's action is determined by these properties as well as the general expectation of each reaction. These properties are evaluated through 5 fitness measures so as to deal with multi-objective criteria. Here, we pr...

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A NOTE ON EXPANSIVE ℤk-ACTION AND GENERATORS

  • Shah, Ekta
    • Communications of the Korean Mathematical Society
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    • v.34 no.4
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    • pp.1329-1334
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    • 2019
  • We define the concept of a generator for a ${\mathbb{Z}}^k$-action T and show that T is expansive if and only it has a generator. Further, we prove several properties of a ${\mathbb{Z}}^k$-action including that the least upper bound of the set of expansive constants is not an expansive constant.

Developmental Changes of Gustatory Neurons in Nucleus of Solitary Tract in Rats

  • Kim, Mi-Won;Kim, Won-Jae;Mistretta, Charlotte
    • The Korean Journal of Physiology and Pharmacology
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    • v.4 no.3
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    • pp.169-175
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    • 2000
  • To learn the developmental changes in intrinsic electrophysiological properties of the second order taste neurons, whole cell recordings from the developing nucleus of the solitary tract neurons were done in brainstem slices of postnatal rats. Rats aged from postnatal 0 to 21 days (P0-P21) were used, being divided into 3 age groups: postnatal first week (P0-P7 days), second week (P8-P14 days), and third week (P15-P21 days). Slices containing gustatory NTS were cut horizontally in the thickness of $300\;{\mu}m.$ Whole cell recordings were obtained from neurons in response to a series of hyperpolarizing and depolarizing current pulses. The intrinsic electrophysiological properties of the rostral NTS (rNTS) neurons were compared among the age groups. Depolarizing current pulses evoked a train of action potentials in all neurons of all age groups. The resting membrane potential and input resistance of the neurons did not show any significant differences during the postnatal 3 weeks. The time constant, however, decreased during the development. Duration of action potential measured at half maximum amplitude was longer in younger age groups. Both the maximum rate of rise and the maximum rate of fall in the action potential increased during the first 3 weeks postnatal. Electrophysiologically more than half neurons were type III. In summary, it is suggested that developmental changes in electrophysiological properties in rNTS occur during the first three weeks in rats.

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