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한종석,정진호,김영권,Han, Jong-Seok,Jung, Jin-Ho,Kim, Yung-Kwon 한국전기전자학회 1997 전기전자학회논문지 Vol.1 No.1
정지궤도 위성과 지구국간 광통신을 대기상태와 앙각의 함수로써 해석할 수 있는 한모델(Han's model)을 제시하였다. 한모델에서는 대기상태를 맑은날, 구름낀 날, 안개, 헤이즈, 비, 눈의 여섯가지 전형적인 상태로 구분한다. 비트오류을 $10^{-7}$을 만족하는 데이터 전송속도를 한모델을 이용하여 상향링크와 하향링크에 대해 해석하였다. 상향링크시의 포인팅손실이 하향링크시의 대기에 의한 공간 가간섭 저하보다 크기 때문에 데이터 전송속도는 하향링크 보다 오히려 상향링크시에 제한됨을 알 수 있었다. Han's model, which is able to analyze optical communication between earth station and geo-satellite as a function of atmospheric conditions and elevation angles. is presented. In Han's model, atmospheric conditions are roughly classified into six basic types; clear sky, cloud, haze, fog, rain and snow. Data rate satisfying for the BER below $10^{-7}$ is analyzed by Han's model in case of up-link and down-link, respectively. Data rate is more limited by up-link than by down-link because the pointing loss caused by atmosphere on the up-link is greater than the spatial coherence degradation caused by atmosphere on the down-link.
위 전절제술을 받았던 환자에서 아급성 연합성 변성 1예
한정호,하현욱,이정석,송은향,김우정,김두응,최진영 건국대학교 의과학연구소 2000 건국의과학학술지 Vol.10 No.-
Subacute combined degeneration is a metabolic disorder of the spinal cord caused by vitamin B12 deficiency. A 72-year old man was admitted with weakness and tingling sensation of the bosh upper extremities. 9 years ago, he was diagnosed as having stomach cancer. So total gastrectomy with splenectomy was done at that time. The complete blood cell counts and morphology revealed megaloblastic anemia. Nerve conduction velocity study(NCV), electoromyography(EMG) and somatosensory evoked potentials(SEP) showed diffuse sensorimotor peripheral neuropathy. Magnetic resonance imaging(MRI) showed an increased T2-weighted signal, mild decreased T1-weighted signal, and slight contrast enhancement of the posterior columns of the cord in the cervical and upper thoracic spinal region. He was treated with vitamin B12 supplements and improved gradually. If abnormal sensation and muscle weakness was developed after gastrointestinal surgery, subacute combined degeneration should be considered in the differential diagnosis. We describe MRI findings of a typical case of subacute combined degeneration, which was induced by total gastrectomy.
횡문근 융해증의 Tc-99m Methylene Diphosphonate 신티그라피 소견
한창진,박찬희,윤석남,배문선,김수지,신규설 아주대학교 1997 아주의학 Vol.2 No.2
Many causes of rhabdomyolysis have been reported in the literature. Technetium-99m methylene dipho-sphonate (Tc-99m MDP) bone scintigraphy is considered to be the most sensitive and effective modality in defining the extents of disease involvement and follow-up of patients with rhabdomyolysis. In this paper, we reviewed two cases of generalized rhabdomyolysis related to seizure activities and two cases of localized rhabdomyolysis related to an excessive exercise. In addition other causes of rhabdomyolysis and possible mechanisrns of Tc-99m MDP uptake are discussed briefly.
韓光植,金鎭錫 단국대학교 산업연구소 2000 산업연구 Vol.22 No.-
The purpose of this study attempted to have empirical analysis on financial performance of our listed enterprises on the basis of comparison between it financial status before and after M&A from 1986 to 1995 were organized as at) test group and another group of 24 enterprises were made into a control group and by means of paired sample difference in average between t재 groups during the period of 2 years before the M&A and 2 years thereafter was computed and then net M&A effect was produced by deducting difference in average between the test group and control group and resulting figures were subjected to test and Wilcoxon Signed-Rank Test. As a resulted of this study it could be discovered that enterprises in Korea which underwent M&A did not show significant difference in any financial performance after M&A but only showed significant difference financial performance after M&A but only showed significant difference in performance in market value ratio and earning ratio for stocks (PER). Also based on M&A types any significant improvement in financial performance appeared more frequently with conglomerate M&A than with non-conglomerate case solely in quick ratio and net sales growth ratio but there was no significant difference in performance in terms of financial ratio. From this study it was possible to confirm that there was no significant difference in financial performance through M&A of our enterprises but some difference in stock earning ratio (PER) thus showing that our enterprises which went through M&A rae receiving positive appraisal from our capital market. And it was also discovered that while there was no significant difference in financial performance when analysis on the basis of M&A types but some significant financial performance in terms of quick ratio net sales growth ratio in conglomerate M&A.
한길영,김진석,안동규 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1
The objective of this research is to investigate the electromagnetic interference(EMl) shielding characteristics of aluminium sandwich panel. We fabricated aluminium sandwich panel with core material Ni-Cu fabrics. The measurements of shielding effectiveness(SE) were carried out frequency range 300MHz -1 GHz for commercial purposes such as electric or telecommunication devices. The return loss and loss due to absorption were also measured as a function of frequency in the microwave(300MHz-1GHz) region. It is observed that the SE of the composites is the frequency dependent, increases with the increases in filler loading. The Ni-Cu fabrics core material showed higher SE compared to that of AI. The aluminium sandwich panel was shown to exhibit up to 40dB of SE.The results indicate that the composite having higher filler loading can be used for the purpose of EMI shielding as well as for some microwave applications.
유압 인버터 엘리베이터에서의 극저속 속도제어를 위한 퍼지논리 제어기의 설계
한권상,김병화,이우철,장태호,이건학,사공석진,안현식,김도현 대한전자공학회 1999 夏季綜合學術大會 論文集 Vol.22 No.1
In this paper, a fuzzy logic controller is designed for speed control of a hydraulic inverter elevator. Mathematical modeling of an elevator actuated with hydraulic system is presented and the friction characteristics of a cylinder is examined, which may cause the abrupt increase of the acceleration in the zero-crossing speed region. Simulation results show that the proposed fuzzy logic speed controller yields a better control performance than conventional PID controller.