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        분무열분해법에 의한 나노 MgB2 분말 제조 연구

        고재웅,유상임,유재무,김영국,정국채,한봉수,김영준 한국초전도.저온공학회 2005 한국초전도저온공학회논문지 Vol.7 No.1

        Nano-sized spherical MgB2 powders were synthesized by spray pyrolysis method. The influence of solution concentration and furnace reaction temperature on morphology and average particle size were investigated. For adequate preparation conditions, it has mostly spherical, solid and narrow particle size distribution. Average particle size(X50) distribution was below 100 nm. The critical temperature for the synthesized MgB2 was around 36K.

      • KCI등재
      • 하소 온도가 $Y_2 BaCuO_5$의 소결밀도에 미치는 영향

        고재웅,이수영,김해두,정형식,Go, Jae-Ung,Lee, Su-Yeong,Kim, Hae-Du,Jeong, Hyeong-Sik 한국기계연구원 1990 기계연구원소보 Vol.20 No.-

        The $Y_2 BaCuO_5$ phase was synthesized under various calcination temperatures and sintered. The $Y_2 BaCuO_5$ phase strarted to form at $850^{\circ}C$ for 6hours calcination time and, at $1000^{\circ}C$, all the X-ray diffraction peaks corresponded to $Y_2 BaCuO_5$. The sintered density of $Y_2 BaCuO_5$ was increased to 97 % of its theoretical density by the control of calcination temperature.

      • KCI등재
      • KCI등재

        The Effect of the Revised Clinical Pathway of Cardiac Rehabilitation on Participation Rates in Patients with Myocardial Infarction: A Retrospective Study

        고재웅,김한미,방희제,이구주 한국성인간호학회 2018 성인간호학회지 Vol.30 No.5

        Purpose: The purpose of this retrospective study was to investigate the effect of revised cardiac rehabilitationClinical Pathways (CPs) on the Cardiac Rehabilitation (CR) participation rate of patients with Myocardial Infarction(MI) undergoing Percutaneous Coronary Intervention (PCI). Methods: We reviewed the electronic medical recordof patients who were referred for CR after MI from July 2015 to December 2016. In April 2016, the patient groupswere divided into 9-month periods: pre- and post-CP revision. We reduced the mean number of hospital visits forCR and the wait times before starting CR and the first Cardio Pulmonary Exercise (CPX) test. We added ahome-based CR program and reinforced the CR liaison nurse’s role. The changes in the CR wait time, mean numberof hospital visits post-discharge, and participation rates at 1 and 3 months were investigated. Results: Ninety-twopatients were recruited from July 2015 to March 2016. Twenty-four (26.1%) participated in CR at 1 month, and 11(12.0%) were maintained up to 3 months. From April 2016 to December 2016, 107 patients were recruited. Sixty-five(60.7%) participated at 1 month, and 38 (35.5%) were maintained up to 3 months. The mean number of hospitalvisits was 3.5±0.8 versus 1.9±0.9 in the previous and revised CP groups. The average number of days to the firstCPX test after MI was 43.4±17.6 versus 26.3±10.6. Conclusion: Following CP revision, the CR participation ratesignificantly improved among patients with PCI post-MI. CP revision in terms of inter-physician communication andadditional nursing interventions should be considered.

      • KCI등재

        만곡유로에서의 하상변동에 관한 연구

        고재웅 한국수자원학회 1975 한국수자원학회논문집 Vol.8 No.2

        The fluvial phenomena in the bended natural river course are studied experimentally. Some theoretical and empirical conclusions were derived in prior to this study by some authors but the limitation of applicability of those results are not clearly known because of the sensitibitys of the flow regime in the reach. The main objective of this study is directed to evaluate the mechanism of sedimentation and the cross sectional changes in the equilibrium status. the most governing factor influenced to the cross sectional changes in the bended reach is the occurance of spiral flow. In this study, the streamlines and velocity distributions are checked at given interval by the hydraulic model to find out the place where spiral flow are existing under the various flow magnitudes.

      • KCI등재
      • 韓國河川의 洪水特性에 관한 硏究

        高在雄,文濟吉 건국대학교 1979 學術誌 Vol.23 No.2

        This study presents the hydrological and statistical Analysis of the flood charateristics in Korean Rivers. The area selected for study were Han, Naktong, Geum, Yeongsan, and Seomjin River. Twenty four gauging stations in the rivers were selected for the analysis of the basin max. daily rainfall and food peak discharge records. The purpose of this study was to set up the accurate way of estimating the frequency of the max. daily rainfall and flood peak discharge of the basin. The following five methods of the rainfall frequency analysis were applied to each station; 2 parameter lognormal, 3 parameter lognormal, Type I extremal (Gumbel method), Pearson Type III, and log-Pearson Type III. The regression equations were established between the depth of max. daily rainfall given any reccurrence interval and the basin area. Three methods of flow frequency analysis currently in common use were applied in this study, the Hazen, Type I extremal, and log-Pearson Type III. The three methods involved not only the computation of the statistics appropriate to the distributions, but alto the relating of these statistics to basin and climatologic characteristics. Methods for regional analysis were used for this study to compare the results of regional flood frequency made by three methods and appraises the relative reliability of these methods. The correlation graph and the dimensionless flood frequency curves are the end products of this analysis. On the basis of the regional study of the rainfall frequency and the flood frequency, the following conclusions were reached : (1)The larger the basin area are the less the depth of rainfall for same recurrence interval based upon the results of the rainfall frequency analysis of the max. daily rainfall in the basins. (2)There are no significant differences between each basin in rainfall depth for same recurrence interval. Derivation of the depth of indicated recurrence interval are estimated as follows : P100 = 725A-0.140 P50 = 595A-0.128 P20 = 415A-0.114 P10 = 355A-0.101 P5 = 280A-0.093 P2 = 150A-0.056 (3)Three parameter lognormal is the best fits probability function for the frequency analysis of the max. daily rainfall statistics in Korean Rivers. (4)Combining records for all stations in a hydrologically homogeneous area tends to reduce the sampling error associated with a non representative sample. The results of the regional flood frequency study provides the meaningful yardsticks for determining the design flood. (5)The mean annual flood, defined as the discharge corresponding to a recurrence intervall of 2.33 years are each correlated with basin and climatologic parameters in the homogeneous region. Only drainage area was the statistically significant parameter. Regression equations for Q2.33 are obtained as follows. Han River Basin : Q2.33=5.53A0.772 Naktong River Basin : Q2.33=43.16A0.492 Geum River Basin : Q2.33=20.28A0.593 Yeongsan and Seomjin : Q2.33=1.36A0.972 (6)The most remarkable results pointed out in this study is the coincidence of the regional flood frequency curves for the five river basins. This means that the whole Korean Rivers have the hydrologically homogeneity. (7)Advantages of the regional flood frequency relation and max. daily rainfall frequency derivation in thin study are that those relation can be applied to ungaged sites in the region wherever.

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