• Fibers and Polymers
• /
• 제4권3호
• /
• pp.135-144
• /
• 2003

Permeability of the preform is one of key factors in design of RTM (Resin Transfer Molding) mold, determination of processing conditions, and modeling of flow in the mold. According to previous studies, permeability measured in the unsaturated fiber mats are higher than that in the saturated fiber mats by about 20% because of the capillary pressure. In this study, permeabilities of several fiber preforms are measured for both saturated and unsaturated flows. A saturated experiment of radial flow has been adopted to measure the permeability of anisotropic fiber preforms with high fiber content, i.e., circular braided preforms. In this method, four pressure transducers are used to measure the pressure distribution. Permeabilities in different directions are determined and the experimental results show a good agreement with the theory. Since permeability is affected by the capillary effect, permeability should be measured in the unsaturated condition for the textile composites to be manufactured under lower pressure as in the Vacuum Assisted Resin Transfer Molding (VARTM).

• Journal of Biomedical Engineering Research
• /
• 제40권6호
• /
• pp.235-241
• /
• 2019

The purpose of this study was to investigate the effect of the body temperature peripheral circulation with vibration shoes in healthy 10 adults. The magnetic vibration device with non-electric power was mounted in the midsole of the vibration shoes. The experiment was divided into two groups: vibration shoes and no vibration shoes. Subjects were randomly selected and measured body surface temperature by digital infrared thermal imaging (DITI) and non-invasive capillaries change by nailfold microscope (NFM). After walking in a treadmill for 15 minutes at 4.0 km/h speed wearing normal shoes or vibration shoes, DITI and NFM were measured. The walking with vibration shoes showed the body surface temperature shift from the proximal to the distal. In addition, the diameter of the nailfold capillary in the vibration shoes group was thicker and clearer due to the increased blood flow than that of the no vibration shoes group. The vibration shoes are easy to apply to anyone who can walk because it can give vibration stimulation by walking without additional time, cost, and effort in daily life. Further studies are needed to explain the physiological effects of vibration frequency and intensity on the long-term perspective of target subjects resulting from vascular dysfunction.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
• /
• pp.727-730
• /
• 2004

Closed-cell type barrier ribs such as honeycomb, SDR, inverse SDR and waffle types were produced using capillary molding process. Phosphor layers were formed by osmosis coating process on those barrier ribs. Using the rear plate with closed-cell ribs, the luminance and its efficiency was measured. The results demonstrated a significant improvement in efficiency by combining closed-cell type ribs with a new phosphor forming technology

• YAKHAK HOEJI
• /
• 제14권3_4호
• /
• pp.45-50
• /
• 1970

Anti-infalmmatory action of p-methoxycinnamic acid (p-MCA) was investigated. p-MCA showed a significant decrease in carrageenin and acetic acid induced edema of the rat hind paw, and increased capillary permeability by anaphylaxis and chemical mediators of pontamine sky blue in the mouse peritoneal cavity. It, however, showed only weak inhibitory effect on cotton pellet-induced granuloma formation of the rat.

• Proceedings of the Korean Society of Applied Pharmacology
• /
• 한국응용약물학회 2001년도 추계학술대회 및 정기총회
• /
• pp.80-80
• /
• 2001

The roots of Scutellaria baicalensis Georgi have been used in the chinese medicine for the treatment of inflammation, fever and headache. Recent studies had shown that baicalin and baicalein showed a detoxifying effect and could inhibit peripheral capillary permeability, and Wogonin was found to inhibit the proliferation of tumor cells. Wogonin has been synthesized as shown in schem. Compound 2 was prepared from 2,6-dimethoxy-1,4-benzoquinone(1) followed by acylation to give compound 3. The base treatment of 3 gave cyclized product which was carried by deprotection of methyl group chemoselectively. Overall step included relatively simple ten steps.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 한국소음진동공학회 2012년도 춘계학술대회 논문집
• /
• pp.562-563
• /
• 2012

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제11권2호
• /
• pp.59-66
• /
• 2007

The oxygen distribution at steady state is analyzed mathematically in a hexagonal cylinder. The domain is penetrated by parallel cylindrical capillaries of different oxygen squirt. Asymptotic solution is used to determine the effect of axial diffusion. Oxygen concentration profiles are displayed at some positions of capillary-beds. At the venous end some tissue areas suffer from a shortage of oxygen.

• YAKHAK HOEJI
• /
• 제31권3호
• /
• pp.164-172
• /
• 1987

The anti-inflammatory mechanism of daidzein was investigated in rats and mice. Daidzein and 4'-methyldaidzein inhibited capillary permeability and lipid peroxidation. Daidzein inhibited growth of granuloma when it was administered into the carrageenin pouch at the low dose, while it acted contrarily at the high dose. Daidzein decreased the antiinflammatory effect in adrenalectomized rat, depleted ascorbic acid and cholesterol contents in adrenals, and increased corticosterone level in plasma, suggesting dadzein acts on the hypophysisadrenal system.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
• /
• 제3권1호
• /
• pp.25-40
• /
• 1990

Chunggisan has been widely used in treatment of urticaria which is based on. Oriental Medical literatures. These studies were attempted experimental effects of chunggisan on the analgesia, sedation, antipyretic, anti-inflammatory and isolated illeum of the experimental animals. The result of the studies were as follows: 1. The inhibitory effect was recognized on the Analgesic study by the Acetic acid Method in mice. 2. The spontaneous momentum of mice was restricted and the duration of Hypnosis induced by pentobarbital-sodium in mice was prolonged. 3. Anti-inflammatory effect was recognized significantly on the rat hind paws edema induced by dextran. 4. The inhibitory effect of leukocyte emigration was recognized by the CMC airpouch method of rats. 5. The inhibitory effect was noted on capillary permeability induced by histamin in mice. 6. Spontaneous mobilities in isolated ileum of mice were significantly suppressed, and contraction by acetylcholine, barium chloride and histamine were inhibited. According to the above results, it is expected that chunggisan can be widely used in treatment of urticaria.

• Proceedings of the Korea Concrete Institute Conference
• /
• 한국콘크리트학회 1998년도 가을 학술발표대회 논문집(III)
• /
• pp.883-887
• /
• 1998

Hydration is the main reason for the growth of the material properties. A exact parameter to control the chemical and physical process is not the time, but the degree of hydration. Therefore, it is reasonable that development all material properties should be formulated in terms of degree of hydration. Mathematical formulation of degree of hydration is based on combination of reaction rate functions. The effect of moisture conditions as well as temperature on the rate of reaction is considered in the degree of hydration model. This effect is subdivided into two contributions: water shortage and water distribution. The former is associated with the effect of on the progress of hydration. The water needed for progress of hydration do not exist and there is not enough space for the reaction products to form. The latter is associated with the effect of free capillary water distribution in the pore system. Physically absorption layer does not contribute to progress of hydration and only free water is available for further hydration.