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Shock Model for the Reversed Current Flow in a Z-pinch Plasma
Ki-TaeLee,김동언,Seong-HoKim 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.2
A reversed current ow in a Z-pinch plasma, which has been observed in previous experiments, is reproduced in a one-dimensional magnetohydrodynamics simulation. The detailed investigation reveals that the formation of the reversed current ow is caused by the propagation of a shock wave. According to the results of the numerical simulation, a new theoretical model, a shock model, is proposed to account for such a phenomenon. The new model shows that a reversed current ow appears when a shock wave that is re ected at axis expands in a compressing plasma column. An ejection of plasma at the boundary and an enhancement of the pinch have also been found to be caused by the expanding shock wave. A reversed current flow in a Z-pinch plasma, which has been observed in previous experiments, is reproduced in a one-dimensional magnetohydrodynamics simulation. The detailed investigation reveals that the formation of the reversed current flow is caused by the propagation of a shock wave. According to the results of the numerical simulation, a new theoretical model, a shock model, is proposed to account for such a phenomenon. The new model shows that a reversed current flow appears when a shock wave that is reflected at axis expands in a compressing plasma column. An ejection of plasma at the boundary and an enhancement of the pinch have also been found to be caused by the expanding shock wave.
Adaptive Compensation for the Nonlinearity Error in a Heterodyne Interferometer
김병준,Ki-HoKim,유관호 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.11
Laser interferometry has been widely used in the field of nano-metrology due to its superior properties, such as its almost unlimited resolution and its flexible set up. In practical measurements with a heterodyne laser interferometer, however, some obstacles, such as environmental and nonlinearity errors, limit its measurement accuracy. In this paper, we compensate for nonlinearity errors by applying the recursive weighted least-squares method and the robust observer based Kalman filter algorithm, consecutively. To demonstrate the performance of the two proposed algorithms, we performed simulations and experiments. The experimental results show the improved accuracy obtained by using the proposed algorithms.
P057 : Acral lentiginous melanoma arsing from small and medium sized congenital melanocytic nevi
( Seung Min Ha ),( Seu Ng Hwan Choi ),( Dong Yeob Ko ),( Ki Hokim ),( Ki Hoon Song ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Background: Congenital melanocytic nevi (CMN) are classified as small, medium, and giant according to their size. Giant CMN are well known risk factors for the development of melanoma. But, the risk of melanoma in small and medium sized CMN is controversial and there is few study for evaluation of melanoma risk in patient with small and medium sized CMN in Asian patients. Objectives: We investigate to evaluate a relationship between small and medium sized CMN and acral lentiginous melanoma (ALM). Methods: A total of 73 patients with histologically confirmed ALM who were received surgical treatment and follow up more than 1year were included. We divided them into 2 groups according to arising or not from the CMN (CMN group = 18, Non-CMN group = 55) and compare the both groups in clinicopathological features. Also, clinicopathological feature was compared in each subgroup of CMN group according to size. Results: The proportion of small or medium sized CMN in the patients with ALM (24.7%) is higher than those in previous studies (7.9-15%). CMN group showed earlier onset age (47.89±10.67) than those of non-CMN group (59.40±14.89) (p=0.034). There is no different other clinicopathologic parameters between CMN group and Non-CMN group. In CMN group, more larger CMN tends to have larger primary tumor size (p=0.024) and deeper tumor depth (p=0.048). Conclusion: Our data shows that ALM arising from CMN occurs at earlier age and small and medium sized CMN have a higher malignant potential than we expect.