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박현상,전석봉,김영서,천승민,채영한,권혁남 大韓醫用生體工學會 1999 대한의용생체공학춘계학술대회논문집 Vol.21 No.1
In the case of emergency room, which including the patient transfort procedure. there are some difficulties caused by the absence of former information about the patient. This information offers basic environment to doctor's behavior and makes doctor ready for the further stpes have to be done. So we tried to improve this point by offering the data of patient's E.C.G way e. just through the reconstructions of current equipment and wireless transfer system.
채영한,전석봉,김영서,천승민,박현상,권혁남 大韓醫用生體工學會 2000 대한의용생체공학춘계학술대회논문집 Vol.22 No.1
CE(Clinical Engineering) fields have been emphasized on simultaneous assistance while clinical operation including normal maintenance. Especially in OR (Operating Room), composite CE forms are requested from its importance and emergent situations. We have carried out CE jobs for seven years with classifying it into three major parts, BO(Before Operation), OO(On operation), and AO(After Operation). Based on these experiences, we studied on more efficient and pertinent CE jobs to our domestic situation by analyzing and comparing with foreign's and are going to suggest just a model of standard formations of CE in this paper.
강석철,전영건,전길무 한국부식학회 1991 Corrosion Science and Technology Vol.20 No.4
The cyclic oxidation behaviour of commercial superalloys produced in Korea was investigated in air at 1000℃, 1050℃ and 1100℃. Cyclic oxidation test was carried out by cyclically oxidizing the specimens in an apparatus which periodically removed the specimens from the furnace and reinserted them. The influence of growth stress and thermal stress on the cyclic oxidation was studied by examination of the oxide structures, their morphologies, and EDS line scanning of cross-section of cyclically oxidized specimens. The results showed that Inconel 601 was the best in the cyclic oxidation resistance among the tested alloys, followed by Nimonic 80A, Incoloy 825 and Inconel 718 at 1100℃. As in the case of the isothermal oxidation, relatively pure Cr₂O₃ was effective in the beginning of cyclic oxidation experiment. But, later on, other oxidation products as well as Cr₂O₃ were formed, resulting in the spallation of oxide scales. Especially, Nb and Mo in the alloys were determental to the cyclic oxidation behavior.
Synthesis of a high-performance citric acid-based polyester elastomer by a hot-pressing technique
Chon, Y.J.,Koo, J.M.,Park, Y.J.,Hwang, S.Y.,Jung, Y.M.,Im, S.S. IPC Science and Technology Press 2017 Polymer Vol.125 No.-
The high-performance bio-based elastomer, poly (1, 4-cyclohexanedimethanol succinate-co-citrate) (PCSC), was successfully synthesized through the combination of melt polymerization and hot pressing. Owing to the structural characteristics of citric acid (CA), an effective process of thermal- and pressure-integrated crosslinking was possible, revealing CA to be a progressive tetra-functional monomer. In the composition of PCSC, there can be four types of ester bonds amongst monomers, of which CA was used in three. Specifically, the stepwise hot-pressing method allowed β-carboxylic acid and hydroxyl group of CA to remain within the synthesized elastomer to enhance its crosslinking density via esterification. As a result, the synthesized PCSC possessed a wide range of mechanical properties along with good thermal resistance. The resulting characteristics were demonstrated by fourier-transform infrared spectroscopy (FT-IR), two-dimensional correlation spectroscopy (2D-COS), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and tensile and swelling tests. PCSC is a sustainable and versatile material that can be utilized in the field of engineering.
Chon, S.H.,Liu, S.M.,Kim, T.N.,Park, Joong Kuen Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.345-346 No.-
<P>The effect of deformation route on the mechanical properties of grade-1 CP-Ti deformed by equal-channel angular pressing (ECAP) was studied using tensile testing, TEM observation, Xray pole figure measurement, and ODF calculation. Route Bc showed high yield stress and comparatively large uniform elongation, thus high ultimate tensile strength, because of its fine grain structure with high angle grain boundary. The reason for this was because of the occurrence of prismatic slip in route Bc, in addition to the commonly occurring basal slip. Route C showed surprisingly high yield stress despite of its unfavorable grain structure because of the significant contribution of texture hardening.</P>
BREAKUP MODELING OF A LIQUID JET IN CROSS FLOW
K.-S. IM,K.-C. LIN,M.-C. LAI,M. S. CHON 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.4
We propose a novel breakup model to simulate the catastrophic breakup regime in a supersonic cross flow. A developed model has been extended from an existing Kelvin-Helmholtz/Rayleigh-Taylor (K-H/R-T) hybrid model. A new mass reduction rate equation, which has critical effects on overall spray structure, is successfully adopted, and the breakup length, which is an important parameter in existing model, is replaced by the breakup initiation time. Measured data from the supersonic wind tunnel with a dimension of 762×152×127 mm was employed to validate the newly developed breakup model. A nonaerated injector with an orifice diameter of 0.5 mm is used to inject water into a supersonic flow prescribed by the momentum flux ratio of the liquid jet to free stream air, q0. The conservation-element and solution-element (CE/SE) method, a novel numerical framework for the general conservation law, is applied to simulate the supersonic compressible flow. The spray penetration height and average droplet size along with a spray penetration axis are quantitatively compared with data. The shock train flow structures induced by the presence of a liquid jet are further discussed.
Lee, S.M.,Yeon, D.H.,Chon, S.S.,Cho, Y.S. Elsevier Sequoia 2016 JOURNAL OF ALLOYS AND COMPOUNDS Vol.685 No.-
Controllable band gap has been pursued to absorb a proper range of light by p-type absorber semiconductors for better performance photovoltaic devices. Here we introduce double substitutions with Cd and Cu for non-colloidal p-type PbS thin films to cover a broader range of optical band gap from 1.22 to 1.78 eV. Thin films of (Pb<SUB>1-x</SUB>Cd<SUB>x</SUB>)<SUB>1-y</SUB>Cu<SUB>y</SUB>S (x = 0-0.3 and y = 0-0.3) were grown by a single step chemical bath deposition process at a low temperature of 70 <SUP>o</SUP>C. The incorporation of Cd resulted in a wider band gap but changed the type of semiconductor into n-type above x = 0.2. Only the proper substitutions with both Cd and Cu induced an optimal band gap of 1.63 eV, which means a substantial improvement compared to 1.22 eV for pure PbS thin film, while maintaining p-type conductivity. Interestingly, excessive Cu substitutions beyond y = 0.2 inhibited crystallization significantly and generated an undesirably high carrier concentration.