• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.139-140
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• 2012

• 생약학회지
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• 제16권2호
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• pp.65-72
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• 1985

These studies were conducted to investigate the effect of 'Inchungbaek' water extract on analgesic and sedative actions, the relaxing action of isolated ileums, vasodilating action and blood pressure. The results of these studies were summarized as follows: Analgesic and sedative actions of 'Inchungbaek' were recognized in mice and rats. The relaxing action of isolated ileums were seen in mice and rabbits, antagonist action was seen acetylcholine and $BaCl_2-induced$ contraction of isolated ileums, and then recognized direct action in the ileum smooth muscle. Hypotensive and vasodilating actions due to vascular smooth muscle relaxation were noted in rabbits and cats.

• 대한한방내과학회지
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• 제15권1호
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• pp.227-237
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• 1994

These studies were carried out to investigate the effects of Ohotang water extract on the inhibitory contractile action of acetylcholine in control rat. The results of these were as follows; 1. Contractile force of acetylcholine from trachea smooth muscle in control rat was significantly inhibited by Ohotang. 2. Dose-response of acetylcholine pretreated Ohotang in control rat was significantly inhibited. 3. Inhibitory contractile action of acetylcholine pretreated propranolol in control rat was significantly inhibited by Ohotang. 4. Contractile force of acetylcholine pretreated indomethacin from trachea smooth muscle in control rat was not significantly changed. 5. Inhibitory contractile action of acetylcholine pretreated methylene blue in control rat was not significantly changed.

• International Journal of Air-Conditioning and Refrigeration
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• 제12권4호
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• pp.198-205
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• 2004

An experimental study was carried on the characteristics of fluid flow and heat transfer in a fluidized bed shell-and-tube type heat exchanger with corrugated tubes. Seven different solid particles having same volume were circulated in the tubes. The effects of vari­ous parameters such as water flow rates, particle geometries and materials, and geometries of corrugated tubes on relative velocities and drag coefficients were investigated. The present work showed that the drag force coefficients of particles in the corrugated tubes were usually lower than those in the smooth tubes, meanwhile the relative velocities between particles and water in the corrugated tubes were little higher than those in the smooth tubes except the particles of glasses.

• 생약학회지
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• 제7권2호
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• pp.99-109
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• 1976

Scolopendra corpus has been used as anticonvulsants and antispasmodics in the oriental medicine. It was previously shown that water extract of Scolopendra corpus had an inhibitory action on ileum in mouse. To investigate the anticonvulsant and antispasmodic activity of Scolopendra corpus, pharmacological studies have been carried out with the water extract of Scolopendra subspinipes mutilans $L.\;K_{OCH}$, which is widely distributed in Korea. 1. The extract depressed convulsions induced by picrotoxin and strychnine. 2. Sedative and antipyretic analgesic action were observed. 3. In mouse and rabbit, tone of intestinal smooth muscle was suppressed with the treatment of the extract and intestinal contraction induced by $BaCl_2$ was also inhibited, suggesting that the extract has a papaverine-like effect. Whereas, in guinea pig, intestinal and tracheal smooth muscle were stimulated, and the effect was antagonized by pre-and after-treatment of diphenhydramine, suggesting that the extract has a histamine-like effect. 4.Flow rate was increased when hind-limb of Toad was perfused with saline containing the extract, but returned to normal within 10 min. Hypotensive effect was observed in rabbit and the effect was abolished by vagotomy.

• 설비공학논문집
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• 제15권5호
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• pp.406-412
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• 2003

An experimental study was carried on the characteristics of fluid flow and heat transfer in a fluidized bed shell-and-tube type heat exchanger with corrugated tubes. Seven different solid particles having same volume were circulated in the tubes. The effects of various parameters such as water flow rates, particle geometries and materials, and geometries of corrugated tubes on relative velocities and drag coefficients were investigated. The present work showed that the drag force coefficients of particles in the corrugated tubes were usually lower than those in the smooth tubes, meanwhile the relative velocities between particles and water in the corrugated tubes were little higher than those in the smooth tubes except the glass.

• 한국환경과학회지
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• 제8권1호
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• pp.61-67
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• 1999

Silicone oil has organic and inorganic properties, and its skeleton is polysiloxane bonding that silicon is bonded hydrogen or organic group. Silicone compounds are very smooth and lubricant properties by low surface tension, low temperature dependence, and nonadhesive properties. Because of these properties, silicone compounds are used as many parts of chemicals, softener, smooth and libricant agents, water-repellent agent, and defoaming agent, etc. Emulsion was prepared with the inversion emulsification method which adopted the agent-in-oil method dissolving the polyoxyethylene(7) tridecyl ether(HLB 12.2) into methoxy terminated poly(dimethyl-co-methyl amino) siloxane and hydroxy terminated poly(dimethyl-co-methyl amino) siloxane in water. At this time, processed emulsion was almost microemulsion. When ratio of emulsifier increases, emulsion is stable bacuause microemulsion is solubilized by emulsion drop size and zeta-potential are decreased. But, when amount of electrolyte is increase, emulsion became unstable because emulsion drop size is increased.

• The Plant Pathology Journal
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• 제24권1호
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• pp.87-89
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• 2008

A blue mold on tomato fruit caused by Penicillium oxalicum occurred sporadically in a greenhouse at Gyeongsangnam-do Agricultural Research and Extension Services. Infection usually occurred through wounds or cracks on the fruits. Symptoms began with water soaking lesions, then became watery and softened eventually. Colony of the causal fungus was white at the early growing stage, turned green on Czapek yeast extract agar and malt extract agar. Conidia were ellipsoidal in shape and $2-6{\times}2-4{\mu}m$ in size. Stipes were septate, smooth, thin walled, and $90-280{\times}3-4{\mu}m$ in size. Penicilli were mostly biverticillate. Ramuli were 1-3 groups, smooth, and $10-16{\times}2-3{\mu}m$ in size. Rami were 1-2 groups and $6-30{\times}2-4{\mu}m$ in size. Metulae were 2-3(5) verticils, smooth, and $12-20{\times}3-4{\mu}m$ in size. Phialides were 5-7 verticilate, ampulliform to cylindroidal, smooth, and $8-12{\times}2-3{\mu}m$ in size. Optimum temperature for growth was about $25^{\circ}C$. Pathogenicity of the fungus was proved on tomato fruit according to Koch's postulation. On the basis of mycological and pathological characteristics, the fungus was identified as P. oxalicum Currie & Thom. This is the first report of the blue mold on tomato fruit caused by P. oxalicum in Korea.

• 대한한방내과학회지
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• 제21권1호
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• pp.46-54
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• 2000

Objectives : Talmyung-san(TMS) has been used for treatment of brain diseases in Chinese traditional medicine. However, little is known about the mechanism by which TMS rescues brain cells from ischemic damages. To elucidate the protective mechanisms of TMS, we execute experiments. Methods : The effects of TMS on ischemia/reperfusion-induced cytotoxicity and generation of nitric oxide(NO) are investigated in primary neonatal myocardial cells and A7rS, aortic smooth muscle cell line. Results : Ischemia/reperfusion itself induces severe myocardial cell death in vitro. However, treatment of the cells with TMS significantly reduces both ischemia/reperfusion-induced myocardial cell death and LDH release. In addition, pretreatment of TMS before reperfusion recovers the lose of beating rates alter ischemia/reperfusion. For a while, the water extract of TMS stimulates myocardial cells to produce NO in a dose dependent manner and it protects the damage of ischemia/reperfusion-induced myocardial cells. Furthermore, the protective effects of the water extract of TMS is mimicked by treatment of sodium nitroprusside, an exogenous NO donor. NG-monomethyl-L-arginine (NGMMA), a specific inhibitor of nitric oxide synthase(NOS), significantly blocks the protective effects of TMS on the cells after ischemia/reperfusion. In addition, on ischemia the water extract of TMS induce NO in A7r5 cell. Conclusions : Taken together, we suggest that the protective effects of TMS against ischemia/reperfusion-induced myocardial damages may be mediated by NO production of myocardial and vascular smooth muscle cell during ischemic condition.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2002년도 학술발표회 논문집(I)
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• pp.3-16
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• 2002

This article describes some of the recent and on-going research developments of the author at Colorado State University. Advances in the field of sedimentation and river mechanics include basic research and computer modeling on several topics. Only a few selected topics are considered here: (1) analytical determination of velocity profiles, shear stress and sediment concentration profiles in smooth open channels; (2) experiments on bedload particle velocity in smooth and rough channels; (3) field measurements of sediment transport by size fractions in curved flumes. In terms of computer modeling, significant advances have been achieved in: (1) flashflood simulation with raster-based GIOS and radar precipitation data; and (2) physically-based computer modeling of sediment transport at the watershed scale with CASC2D-SED. Field applications, measurements and analysis of hydraulic geometry and sediment transport has been applied to: (1) gravel-bed transport measurements in a cobble-bed stream at Little Granite Creek, Wyoming; (2) sand and gravel transport by size fraction in the sharp meander bends of Fall River, Colorado; (3) changes in sand dune geometry and resistance to flow during major floods of the Rhine River in the Netherlands; (4) changes in hydraulic geometry of the Rio Grande downstream of Cochiti Dam, New Mexico; and (5) analysis of the influence of water temperature and the Coriolis force on flow velocity and sediment transport of the Lower Mississippi River in Louisiana. Recent developments also include two textbooks on "Erosion and Sedimentation" and "River Mechanics" by the author and state-of-the-art papers in the ASCE Journal of Hydraulic Engineering.