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장진호,송태경 대한의용생체공학회 2001 의공학회지 Vol.22 No.4
In this paper, we propose a new synthetic aperture focusing scheme for improving the lateral resolution which is one of the most important factors determining the quality of ultrasound imaging. The proposed scheme enables full round-trip dynamic focusing with approximately limited property. This properties are obtained through transmitting plane waves of which the traveling angle varies with the receive subaperture position, as opposed to stepping the spherical wave source across an array in other synthetic aperture focusing schemes, and employing dynamic focusing in receive. In this paper, the properties of the proposed scheme is analyzed in which a hypothetical infinite line source is used to transmit the plane waves and verified through computer simulation results. Also, we show that the proposed scheme is realizable with an array transducer with a finite aperture size. In summary, it is shown through comparison between the field contours of the proposed scheme and the conventional scheme that the proposed scheme can improve greatly the lateral resolution of ultrasound imaging.
연속식 자외선/오존 조사처리에 의한 PET와 PTT 직물의 양이온성 염료 가염화
장진호,김민지,정영진 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.5
Continuous surface treatments of PET and PTT fabrics were carried out to modify their dyeability to four cationic dyes using an electrodeless UV bulb for different periods of time. ESCA analysis of the irradiated fabrics showed higher O/C ratio than that of the untreated fabrics indicating photooxidation of the outer surface layer. PET fabric was photo-oxidized more readily than PTT, while color change was more pronounced in the PTT fabric compared with PET fabric as shown by larger yellowness increase and color difference values. Four cationic dyes, including two hemicyanine dyes and two triphenylmethane dyes, were used to assess the dyeability to the modified polyester fabrics. The irradiated fabrics became more dyeable to cationic dyes with increasing treatment time due to the electrostatic or acid/base interactions. While increase in cationic dyeability was more noticeable in the treated PTT fabric, overall dyeability to cationic dyes was higher in the case of the PET fabrics as expected. Among the dyes used, the triphenylmethane dyes showed higher dyeability to the cationic dyeable polyester fabrics compared with the hemicyanines. Surprisingly laundering and rub colorfastness of the polyester fabrics dyed with cationic dyes were good even though the treatment may only change the surface layer of the fabrics.
Selection of Appropriate Endotracheal Tube in Wild Birds
장진호,박영석,김희종,김혜권,윤영민 한국임상수의학회 2018 한국임상수의학회지 Vol.35 No.5
Wild birds rescued for various reasons are injured and admitted to a wild animal rescue center. With thecase of collision with cars, buildings and wires on a power pole, most wild birds are severely traumatized or getfractured, which need intensive veterinary treatment. In general, inhalation anesthesia to wild birds is the best choicefor the medical and surgical procedure, and intubation is recommended for the stable anesthesia. Although the certainsize of an endotracheal tube can be chosen depending on the size and morphology of the bird, there are a fewstandardized guidelines. Therefore, the optimal endotracheal size of the rescued 162 individual birds of 41 speciesfor four years from March 2014 to December 2017 was investigated and sorted empirically, suggesting possibly theappropriate endotracheal sizes for diverse avian species. It may provide practical information data for wildlifeveterinarians to select the size of an endotracheal tube according to the size of the domestic wild bird species, especiallyduring surgery in the emergency cases.
장진호,최순호,안성목,김부기,서종수 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.2
In an effort to cope with recent high oil price and global warming, developments of air lubricated ships have been pursued to reduce greenhouse gas emissions and to save fuel costs by reducing the frictional resistance. In this study, reduction in the frictional resistance by air lubrication with air layers generated on the lower surface of a flat plate was investigated experimentally in the large water tunnel of SSMB. The generated air layers were observed, and changes in the local frictional drag were measured at various flow rates of injected air. The results indicated that air lubrication with air layers might be useful in reducing the frictional resistance at specific conditions of air injection. Accordingly, resistance and self-propulsion tests for a 66K DWT bulk carrier were carried out in the towing tank of SSMB to estimate the expected net power savings.