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- 저자 : YONGGI KIM (검색결과 89 건)
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Ivan L. Andronov,Yonggi Kim,Young-Hee Kim,Joh-Na Yoon,Lidia L. Chinarova,Mariia G. Tkachenko 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.2
We present a by-product of our long term photometric monitoring of cataclysmic variables. 2MASS J18024395 +4003309 = VSX J180243.9 +400331 was discovered in the field of the intermediate polar V1323 Her observed using the Korean 1-m telescope located at Mt. Lemmon, USA. An analysis of the two-color VR CCD observations of this variable covers all the phase intervals for the first time. The light curves show this object can be classified as an Algol-type variable with tidally distorted components, and an asymmetry of the maxima (the O’Connell effect). The periodogram analysis confirms the cycle numbering of Andronov et al. (2012) and for the initial approximation, the ephemeris is used as follows: Min I. BJD = 2456074.4904+0.3348837E . For phenomenological modeling, we used the trigonometric polynomial approximation of statistically optimal degree, and a recent method “NAV” (“New Algol Variable”) using local specific shapes for the eclipse. Methodological aspects and estimates of the physical parameters based on analysis of phenomenological parameters are presented. As results of our phenomenological model, we obtained for the inclination i=90°, M1=0.745M◉, M2=0.854M◉, M=M1+M2=1.599M◉, the orbital separation a=1.65·109m=2.37R◉ and relative radii r1=R1/a=0.314 and r2=R2/a=0.360. These estimates may be used as preliminary starting values for further modeling using extended physical models based on the Wilson & Devinney (1971) code and it's extensions
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THEORETICAL LINE PROFILES OF THE MAGNETIC COMPACT STARS
KIM YONGGI The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
Using a phenomenological model for the accretion onto the magnetic white dwarf, we calclliated some optical line profiles from the magnetosphere of such systems. Line profiles of these systems seem to be produced in the magnetosphere of the compact star due to the reemission of X-ray produced near the stellar surface. Some results of our new calculation and the analysis of these results will be presented. Our results show that the model used here can reproduce the observed optical line profiles and open the possiblity to determine the parameters of individual systems.
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Kim, Yonggi,Kim, Hyeon Ji,Cho, Wanil,Ko, Sanghoon,Park, Sung Kwon,Lee, Suyong Food & Nutrition Press 2017 Journal of texture studies Vol.48 No.5
<P>Practical applicationsAs the elderly population is increasing throughout the world, there are growing interests in developing food products for older adults with difficulties in chewing and swallowing in the food industry. In this study, the instrumental texture of solid foods in a starch gel system was correlated with the sensory properties perceived by the people aged 60 and older. Based on the principal component analysis, the corn starch gel samples with different hardness were classified into the five groups that were presented with the ranges of stress values. The results obtained in this study may thus provide valuable information on the standard criteria and guidelines customized for the elderly.</P>
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