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The Effects of Microeconomic Fundamentals on the Korean Financial Crisis
Kim,Sunghwan,Kim,Hong Kee,Kim,Jin San 한국산업경영학회 2010 한국산업경영학회 발표논문집 Vol.2010 No.1
In this study, we assess the effects of default risks and financial performance of firms on the overall risk of Korea around its financial crisis in the late 1990s and on their market values, using firm-level data from 1991 to 2007. We develop default prediction models and calculate Altman’s K scores to measure the overall risks and quality of firms respectively. Based on our own default prediction models, we have shown that the default risks of firms were extremely high before the crisis and drastically declined after the crisis. We have also found that the default risks of chaebol firms were much lower before and after the financial crisis and that their market values were much higher after the crisis, compared with those of non-chaebol firms. This implies that the Korean economy with high sovereign risks for a long time experienced the crisis due to weak firm-level fundamentals, regained its vitality due to significant improvements made by chaebol firms through the crisis and has become much stronger than before.
Noncyclic 하며 측정 작용을 갖는 경우의 기하 위상
李用山,金洪錫 대진대학교 1994 大眞論叢 Vol.2 No.-
The value of the geometrical phase observed with two disconnected uniformly wound quarter-turn optical fibers and a linear polarizer between them is quite different from that measured with a uniformly wound half turn optical fiber although evolution curves in the propogation vector sphere for the cases are the same We try to analyze the experimental data by applying the geodesic rule to each evolution curve for the two quarter turn fibers Although this is only a trial, the theoretically obtained values are well compatible with the experimental data.
Cyclic 하며 측정 작용이 무시되는 경우의 기하 위상
李用山,金洪錫 대진대학교 1994 大眞論叢 Vol.2 No.-
The values of the geometric phase observed with and without are not different from that measured with a uniformly wound optical fiber. The experimental data is found to be independent of measurement of polarizer by applying the geodesic rule for the noncyclic. we can not apply the geodesic rule for the cyclic.
C.V.D. 방법에 의한 Cd_0.78Zn_0.22 S박막 성장과 광전기적 특성연구
유상하,이상렬,홍광준,서상석,김혜숙,전승룡,윤은희,문종대 조선대학교 기초과학연구소 1993 自然科學硏究 Vol.16 No.1
We had grown Cd_0.78Zn_0.22S polycrystal thin films on slide substrate using chemical vapour deposition(CVD) method. We measured X-ray diffraction patterns in order to study Cd_0.78Zn_0.22S polycrystal structure. We studied its band gap using transmission curves and photocurrent and also analyzed photoluminescence using configurational coordinate model. We measured Hall effect·on this sample by Van der Pauw method and studied on carrier density and mobility depending on temperature.
李用山,金洪錫 대진대학교 1994 大眞論叢 Vol.2 No.-
We report experimental verification of Berry's topological phase. The key elements in the experiment was a single mode, helically wound optical fiber, inside which a photon of a given helicity could be adiabatically transported around a closed path in momentum space. The experiment confirmed at the classical level that the angle of rotation of linearly polarized light in this fiber gives a direct measure of Berry's phase. The topological nature of this effect was also verified, ie, the rotation was found to be independent of deformations of fiber path if the solid angle of the path in momentum space stayed constant.
Adiabatic 하며 Noncyclic 한 경우의 기하 위상고찰
李用山,金洪錫 대진대학교 1994 大眞論叢 Vol.2 No.-
For a cyclic evolution, the value of the geometrical phase is unique. we discuss that, for a noncyclic evolution, it may have two different values in cases with and without measurements in the projective Hilbert space, respectively. that which value of them will be calculated depends on the use of geodesic rule. In order to illustrate this, we propose the calculation method of Berry s phase by the use of geodesic rule in the systems of adiabatic and noncyclic evolution curves.
단일모드 광섬유를 이용한 Noncyclic한 경우의 기하위상 측정
李用山,金洪錫 대진대학교 1994 大眞論叢 Vol.2 No.-
We report an experimental verification of Berry s phase for noncyclic evolution curves by use of the geodesic rule. we measure the rotation of the plane of polarization in the system of uniformly wound half turn single mode optical fibers The experiments show that we can extract such purely geometric effects for noncyclic evolution.
이경규,김산해,김홍철,이원철,신요안 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-
MIMO (multi-input multi-output) systems can achieve high data capacity and high data rate in the third generation (3G) or beyond-3G mobile communication systems. To effectively improve the performance of MIMO systems, new detection schemes which can mitigate mutual interferences from multiple transmit antennas, are highly required. In this paper, we consider a posteriori probability (APP) type detection schemes for the MIMO systems, and compare with other sub-optimal detection schemes based on zero forcing (ZF) and minimum mean square error (MMSE) - ordered successive interference cancellation (OSIC). Simulation results show that the APP outperforms ZF-OSIC and MMSE-OSIC, while the performance discrepancy becomes smaller as the number of receive antennas increases.
Kim, Hong-San,Oh, Jin-Ho,Choi, Da-Yae,Lee, Jae-Gi,Choi, Jong-Hoon,Hu, Kyung-Seok,Kim, Hee-Jin,Yang, Hun-Mu by Mutaz B. Habal, MD. 2013 JOURNAL OF CRANIOFACIAL SURGERY - Vol.24 No.5
ABSTRACT: The zygomatic nerve (ZN), which originates from the maxillary nerve at the pterygopalatine fossa, enters the orbit through the inferior orbital fissure. Within the lateral region of the orbit, the ZN divides into the zygomaticofacial (ZF) and zygomaticotemporal (ZT) nerves. The ZF and ZT nerves then pass on to the face and temporal region through the zygomaticoorbital foramen and enter their own bony canals within the zygomatic bone. However, multiple zygomaticofacial and zygomaticotemporal canals (ZFCs and ZTCs, respectively) can be observed, and their detailed intrabony courses are unknown. The aim of this study was clarify the three-dimensional intrabony courses and running patterns of the ZFCs and ZTCs, both to obtain a detailed anatomical description and for clinical purposes. Fourteen sides of the zygomatic bones were scanned as two-dimensional images using a micro-computed tomography (CT), with 32-μm slice thickness. Intrabony structures of each canals were three-dimensionally reconstructed and analyzed using Mimics computer software (Version 10.01; Materialise, Leuven, Belgium). We found that some ZTC was originated from ZFC. In 71.4% of the specimens, the ZTC(s) divided from the intrabony canal along the course of the ZFC(s). In other cases, 28.6% of ZTCs were opened through each corresponding ZT foramen. Zygomaticofacial canal originates from zygomaticoorbital foramen, divided into some of ZTCs, and is finally opened as ZF foramen. This new anatomical description of the intrabony structures of the ZFC(s) and ZTC(s) within the zygomatic bone by micro-CT technology provided helpful information to surgeons performing clinical procedures such as Le Fort osteotomy and reconstructive surgeries in the midface region.