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  • 1
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    Application of phase identification using deep learning-based technology for local earthquakes in the Southern Korean peninsula (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-08
    Description: In order to identify the phase of seismic waves, deep learning-based phase identification technologies have recently been developed.It is known that deep learning-based phase identification technology can accurately determine the arrival time of the phase and also identify S waves, which are relatively more difficult to detect than P waves. Approximately 2.4 million seismic data from STEAD and INSTANCE were used to develop deep learning-based phase identification techniques (Sheen, 2021).In this study, a deep learning-based phase identification technology was applied to 871 earthquakes with a magnitude of 2.0 or higher on the Korean Peninsula and compared to the manual seismic wave identification results provided by the Korea Meteorological Administration. As a result, it was confirmed that most of the P-waves of the seismic wave could be identified successfully, and the S-waves were also identified. In addition, the optimal criteria for determining the phase status of P and S-waves were established using deep learning-based seismic wave identification technology. To this end, the learning model predicted the probabilities of P&S-waves, and noise from the three-component seismic waveform, and judged the section where the probabilities of P&S-waves exceeded a specific threshold to be a phase. It was confirmed that the performance of the artificial intelligence model changed according to this specific threshold, and the optimal threshold yielding the highest performance of the AI model was selected. As a result, it was confirmed that as the threshold value increased, the model accuracy increased while the reproduction rate decreased.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 2
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    Surface seismic record estimation by borehole record correction with ambient noise (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-08-02
    Description: The Korea Meteorological Administration is installing new seismic stations or replacing from surface to borehole in order to improve earthquake monitoring. A borehole station has advantage of monitoring because of reducing influence of ambient noise. However, a noticeable difference for the amplitude of the seismic record between borehole and surface seismometers because of a site effect. Thus, a surface record is necessary for calculating a seismic intensity or a structure impact assessment. To correct the data from the borehole station, we use the amplification factor from Borcherdt (1994). This amplification factor was developed to estimate a seismic record of a surface station on a soil layer from a seismic record of a surface station on a bedrock. Applying amplification factor to the borehole record underestimates of the amplification effect. Another method is calculate the transfer function through a direct comparison of borehole and surface records. The method is that the amplification effects are well reflected as they are calculated from actual records. In this study, We proposed a model for calculating the transfer function through direct comparing of surface and borehole records. We used 20 station that temporary surface station was installed and collect earthquake event and ambient noise data. Transfer function was calculated using ambient noise of borehole and temporary surface station. We compared temporary surface record with corrected borehole record that apply transfer function and amplification factor. As a result, borehole record corrected by transfer function was estimated more similar with surface record than corrected by the amplification factor.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
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    A new dynamical downscaling ensemble method for seasonal prediction (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-08-29
    Description: This study investigates the ensemble predictability of summer precipitation downscaled by a regional climate model depending on how the initial and lateral boundary conditions are imposed from a coupled general circulation model (CGCM). Specifically, the ensemble seasonal prediction skill of dynamically downscaled precipitation over South Korea is evaluated by comparing two experiments. The first experiment (EXP1) involves conventional ensemble forecasts. Five ensemble members (EMs) are downscaled dynamically with initial and lateral boundary conditions obtained from the outputs of five CGCM EMs. The results of each EM are averaged for ensemble prediction utilizing a simple composite method. The second experiment (EXP2) is the same as EXP1, but the initial and lateral boundary conditions are obtained by arithmetically averaging the outputs of the five CGCM EMs. Therefore, five integrations are carried out for the EXP1, but only one integration is performed for the EXP2. The results show that EXP2 simulates closer to the observed precipitation than EXP1. This improvement is attributed to the strongly simulated upper zonal wind that can influence the vertically integrated moisture flux convergence. Unlike conventional methods, such as EXP1, EXP2 provides a prediction in a single integration, and the prediction is similar to or even better than the one obtained conventionally. Hence, EXP2 can be a powerful means to drastically reduce the prediction time by reducing the number of ensemble integration to just one. Acknowledgment This work was carried out with the support of the Research Fund of Research Institute for Basic Sciences, Pusan National University, Korea.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
    Electronic Resource
    Electronic Resource
    Optimizing Cholesterol Removal in Cream Using β-Cyclodextrin and Response Surface Methodology (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 64 (1999), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Average cholesterol reduction increased as β-cyclodextrin concentration increased, regardless of other factors. The process was optimized using RSM. When β-cyclodextrin addition was 10%, the effect of stirring speed was more noticeable than that of stirring time. When stirring speed was at 1,600 rpm, 94.2% of cholesterol was reduced in 30 min. When stirring time was 20 min, the cholesterol was reduced 97.99% using 15%β-cyclodextrin. When stirring speed was 1,200 rpm, the effect of β-cyclodextrin addition was greater than that of stirring time. Although the percentage of cholesterol reduction varied with different factors and conditions, about 94% of cholesterol was removed from cream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1999.tb15098.x
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  • 5
    Electronic Resource
    Electronic Resource
    Casein Hydrolysate Fractions Act as Emulsifiers in Process Cheese (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 67 (2002), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Degrees of hydrolysis and emulsifying activity of casein hydrolysates were the highest at 4 h hydrolysis. The oil-off values of the mixture of hydrolysate (H) or supernatant (S) and traditional emulsifier (T) were not significantly different from the control made with traditional emulsifier, except for S + T = 3:1. Two other samples made with hydrolysate or supernatant only (H or S) showed higher oil-off value than the others (p 〈 0.05). In flavor property, no difference was found between samples made with traditional emulsifier and those made with the mixture of hydrolysate or supernatant at the ratio of 3 to 1. Therefore, these results indicated that a mixture of the hydrolysate or supernatant and traditional emulsifier might replace a traditional emulsifier in process cheese manufacturing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2002.tb10684.x
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  • 6
    Electronic Resource
    Electronic Resource
    Antioxidant Properties of Natural Plant Extracts Containing Polyphenolic Compounds in Cooked Ground Beef (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 67 (2002), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Thiobarbituric acid-reactive substances (TBARS) values, hexanal content, and sensory analysis were used to evaluate the effectiveness of selected natural antioxidants to reduce warmed-over flavor (WOF) development in cooked ground beef. The control without added antioxidant showed the highest TBARS value, hexanal content, and WOF scores. Grape seed extract (ActiVinTM) and pine bark extract (Pycnogenol®) significantly improved the oxidative stability of cooked beef. Compared to the control, ActiVinTM, Pycnogenol®, and oleoresin rosemary reduced the hexanal content by 97%, 94% and 73% after 3 d of refrigerated storage, respectively. WOF scores showed a similar pattern as TBARS values and hexanal contents. TBARS values, WOF scores, and hexanal contents were all well correlated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2002.tb10290.x
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  • 7
    Electronic Resource
    Electronic Resource
    Intracellular localization of newly synthesized transferrin receptors in the peripheral sheep reticulocyte
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 291 (1991), S. 154-160 
    Details
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-9861(91)90118-3
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  • 8
    Electronic Resource
    Electronic Resource
    Surface characterization by computer analysis of microtopographer data
    Amsterdam : Elsevier
    Surface Technology 5 (1977), S. 327-343 
    Details
    ISSN: 0376-4583
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0376-4583(77)90034-6
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  • 9
    Electronic Resource
    Electronic Resource
    Alloying effect of Ag sheath on microstructure and superconducting properties of Bi-2223/Ag tape
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 235-240 (1994), S. 3405-3406 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(94)91229-7
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  • 10
    Electronic Resource
    Electronic Resource
    Three-configurational surface magneto-optical Kerr effect measurement system for an ultrahigh vacuum in situ study of ultrathin magnetic films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3801-3805 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have constructed a three-configurational surface magneto-optical Kerr effect system, which provides the simultaneous measurements of the "polar," "longitudinal," and "transverse" Kerr hysteresis loops at the position where deposition is carried out in an ultrahigh vacuum growth chamber. The present system enables in situ three-dimensional vectorial studies of ultrathin film magnetism with a submonolayer sensitivity. We present three-configurational hysteresis loops measured during the growth of Co films on Pd(111), glass, and Pd/glass substrates. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310346
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