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THE LONGEVITY OF CIRCUMSTELLAR DISKS: THE η CHAMAELEONTIS CLUSTER
LYO A-RAN,LAWSON W. A. The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
We have analysed near-infrared JHKL observations of the members of the $\approx$9 Myr-old $\eta$ Chamaeleontis cluster. Using (J - H)/(K - L) and (H - K)/(K - L) IR colour-colour diagrams for the brightest 15 members of the cluster, we find the fraction of stellar systems with near-IR excess emission was 0.60 $\pm$ 0.13 (2$\sigma$). For the CTT and WTT star population, we also find a strong correlation between the IR excess and Ha emission which is also known as an accretion indicator. The (K - L) excess of these stars appears to indicate a wide range of star-disk activity; from a CTT star with high levels of accretion, to CTT - WTT transitional objects with evidence for some on-going accretion, and WTT stars with weak or absent IR excesses. Among the brightest 15 members, four stars (RECX 5, 9, 11 and ECHA J0843.3-7905) with IR excesses ${\Delta}$(K - L) > 0.4 mag and strong or variable optical emission were identified as likely experiencing on-going mass accretion from their circumstellar disks which we confirmed their accretion disks from the optical high-resolution echelle spectroscopic study. The result-ing accretion fraction of 0.27 $\pm$ 0.13 (2$\sigma$) suggests that the accretion phase, in addition to the disks themselves, can endure for at least ${\~}$10 Myr.
Intraventricular and Subarachnoid Fat after Spinal Injury
Lyo, In-Uk,Sim, Hong-Bo,Park, Jun-Bum,Kwon, Soon-Chan The Korean Neurosurgical Society 2008 Journal of Korean neurosurgical society Vol.44 No.2
The authors report an extremely rare case with intraventricular and subarachnoid fat developed after trauma to spine and soft tissue in a 54-year-old male. The initial computed tomography (CT) showed multiple low attenuation lesions, which were thought to be pneumocephalus. Cerebral magnetic resonance imaging (MRI) showed lesions with high signal intensity on T1-weighted magnetic resonance images and high signal intensity on T2-weighted images, indicating fat globules within the CSF. In this report, the clinical presentation, radiological findings, and a review of the literature are presented.
MILLIMETER OBSERVATIONS OF THE TRANSITION DISK AROUND HD 135344B (SAO 206462)
Lyo, A-Ran,Ohashi, Nagayoshi,Qi, Chunhua,Wilner, David J.,Su, Yu-Nung American Institute of Physics 2011 The Astronomical journal Vol.142 No.5
<P>We present ~1'' resolution 1.3 mm dust continuum and spectral line (<SUP>12</SUP>CO and <SUP>13</SUP>CO J = 2-1) observations of the transitional disk system HD 135344B obtained with the Submillimeter Array. The disk shows a Keplerian rotation pattern with an inclination of ~11°, based on the spatially and spectrally resolved <SUP>12</SUP>CO and <SUP>13</SUP>CO emission. The data show clear evidence for both dust and gas surface density reductions in the inner region of the disk (radius <img entity='lsim' SRC='http://ej.iop.org/icons/Entities/lsim.gif' ALT='lsim' ALIGN='BASELINE' /> 50 AU) from the continuum and <SUP>13</SUP>CO J = 2-1 data, respectively. The presence of this inner cavity in both the dust and gas is more consistent with clearing by giant planet formation than by photoevaporation or by grain growth. There is also an indication of global CO gas depletion in the disk, as the mass estimated from <SUP>13</SUP>CO emission (~3.8 × 10<SUP>–4</SUP> M<SUB>☉</SUB>) is about two orders of magnitude lower than that derived from the 1.3 mm continuum (~2.8 × 10<SUP>–2</SUP> M<SUB>☉</SUB>).</P>
THE BRIGHTEST STARS IN GALAXIES AS DISTANCE INDICATORS
LYO A-RAN,LEE MYUNG GYOON The Korean Astronomical Society 1997 Journal of The Korean Astronomical Society Vol.30 No.1
The brightest stars in galaxies have been used as distance indicators since Hubble. However, the accuracy of the brightest stars for distance estimates has been controversial. Recently, Rozanski & Rowan-Robinson [1994 : MNRAS, 271, 530] argued large errors of this method for the distance determination : 0.58 mag and 0.90 mag, respectively, for the brightest red stars and the brightest blue stars, while Karachentsev & Tikhonov [1994 : A&A, 286, 718] suggested much smaller errors in the distance determination than the former: 0.37 mag for the brightest red stars and 0.46 mag for the brightest blue stars. The reasons for these conflicting results are not yet known. In this study we have investigated the accuracy of this method using a sample of 17 galaxies for which Cepheid distances are known and reliable photometry of the brightest stars are available. We have obtained the calibrations of the relations between the mean luminosities of the three blue and red brightest supergiants (BSGs and RSGs, respectively) and the total luminosities of the parent galaxies: $<M_{v(3)RSG}>= 0.21M_B^T- 3.84, \sigma(M_v) = 0.37 mag,\;and\;\delta_{\mu0}=0.47$ mag for the brightest red supergiants, and $<M_{B(3)BSG}>= 0.30M_B^T -3.02, \sigma(M_B)\;=\;0.55 mag,\;and\; \delta_{\mu0}=0.79mag$ for the brightest blue supergiants. Also it is found that the errors in the distance determination are reduced by a factor of two, as the observing wavelengths increase from B-band to K-band. In conclusion, the brightest red supergiants are considered to be useful for determining the distances to resolved late-type galaxies.
Transverse Fracture and Dislocation at the Sacrum
Lyo, In-Uk,Kwon, Soon-Chan,Park, Jun-Bum,Sim, Hong-Bo The Korean Neurosurgical Society 2008 Journal of Korean neurosurgical society Vol.43 No.1
We present a rare case of fracture-dislocation at the level of the first sacral (S1) and second sacral (S2) vertebrae. The S1 was displaced forward into the pelvic cavity and was located just in front of the S2. Because the patient also had extensive neurological injury to the lumbar plexus and instability of the pelvic ring, surgery to stabilize the pelvis and to decompress the lumbar plexus was performed. The surgery was successful and the patient experienced marked improvement in neurological function.
Inner Warm Disk of ESO H<i>α</i>279a Revealed by NA i and CO Overtone Emission Lines
Lyo, A-Ran,Kim, Jongsoo,Lee, Jae-Joon,Kim, Kyoung-Hee,Kang, Jihyun,Byun, Do-Young,Mace, Gregory,Sokal, Kimberly R.,Park, Chan,Chun, Moo-Young,Oh, Heeyoung,Yu, Young Sam,Oh, Jae Sok,Jeong, Ueejeong,Kim American Astronomical Society 2017 The Astrophysical Journal Vol.844 No.1
<P>We present an analysis of near-infrared, high-resolution spectroscopy toward the flat-spectrum young stellar object (YSO) ESO H alpha 279a (similar to 1.5M(circle dot)) in the Serpens star-forming region at a distance of 429 pc. Using the Immersion GRating INfrared Spectrometer (IGRINS; R approximate to 45,000), we detect emission lines originating from the accretion channel flow, jet, and inner disk. Specifically, we identify hydrogen Brackett series recombination, [Fe II], [Fe III], [Fe IV], Ca I, Na I, H-2, H2O, and CO overtone emission lines. By modeling five bands of CO overtone emission lines and the symmetric double-peaked line profile for Na I emission lines, we find that ESO H alpha 279a has an actively accreting Keplerian disk. From our Keplerian disk model, we find that Na I emission lines originate between 0.04 and 1.00 au, while the CO overtone emission lines are from the outer part of the disk, in the range between 0.22 and 3.00 au. The model reveals that the neutral atomic Na gas is a good tracer of the innermost region of the actively accreting disk. We derive a mass accretion rate of 2-10 x 10-7 Me yr(-1). from the measured Br gamma emission luminosity of 1.78(+/- 0.31) x 10(31) erg s(-1).</P>
Lyo Min Kwon,Myungsu Lee 소화기인터벤션의학회 2020 Gastrointestinal Intervention Vol.9 No.3
Benign afferent loop obstruction (ALO) is a complication that occurs after general surgery making Roux-en-Y or Billroth-II reconstruction and has typically been treated surgically. However, the surgery is difficult to conduct in about 25% of cases due to comorbidity and nonoperative management has been attempted. Here, we report two cases of benign ALO that were treated with percutaneous transhepatic afferent loop balloon dilatation and indwelling catheter, including one case with no improvement after surgery.
Lyo Min Kwon,Myungsu Lee 소화기인터벤션의학회 2020 International journal of gastrointestinal interven Vol.9 No.3
Benign afferent loop obstruction (ALO) is a complication that occurs after general surgery making Roux-en-Y or Billroth-II reconstruction and has typically been treated surgically. However, the surgery is difficult to conduct in about 25% of cases due to comorbidity and nonoperative management has been attempted. Here, we report two cases of benign ALO that were treated with percutaneous transhepatic afferent loop balloon dilatation and indwelling catheter, including one case with no improvement after surgery.