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성춘호,정운혁 대한마취과학회 1983 Korean Journal of Anesthesiology Vol.16 No.3
Attention has been drawn to the possible deliterious effects on operating theatre personnel of breathing in an atmosphere polluted with anaesthetic vapour, in particular, halothane. Whether or not the relation of these effects of anaesthetic vapours has been adequately proved, there is unlikely to be any disagreement that pollution of theatre air with anaesthetic is undesirable. Comparable atmospheric pollution with halothane in the same theatre was studied with and without use of halothane absorber $quot;Aldasorber$quot;. The theatre had no device for reducing air pollution. Anaesthetic exhaust fases were drained to the ground. An anaesthetic machine in a semiclosed circle with carbon dioxide absorber was used throughout the anaesthesia. Anaesthesia was maintained with halothane l.0% and 50% oxygen in nitrous oxide, free gas flow rate were oxygen l.5 liter/min and nitrous oxide 1.5 liter/min. Halothane concentrations at various sites of the operating theatre were studied using the method of gas chromatography. 1) Halothane concentrations in the atmosphere of the operating theatre were 0.11 ±0.07 ppm without halothane absorber and 0.13 ±0.14 ppm with halothane absorber at the level of 115cm above the operating theatre floor before anaesthesia. 2) Halothane concentrations in the atmosphere of the operating theatre were 7.50 ±1.32ppm without halothane absorber and 2.82 ±0.93 ppm with halothsne absorber at the level of 115cm above the operating theatre floor after 3 hours of anesthesia. 3) Comparing this data it was concluded that the concentration of halothane vapour in the operating theatre air after 3 hours of anesthesis could be reduced by 65% W1th halothane absorber Aldasorber.
성춘호,박수형,권장혁 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
3-dimensional Euler solver is parallelized. The spatial discretization method is the 2nd order TVD scheme and DADI method with multigrid is used as a time integration. In order to parallelize this solver, the domain decomposition method with overlapped grid and message passing techniques are used. The informations on the each inter-processor bound?aries are communicated with MPI library. Finally, the parallel performance repsented by calculating the ONERA M6 wing at transonic flow condition using ORAY T3E and C90.
성춘호,김윤식,권장혁 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
In this paper, the convergence characteristics of preconditioned multigrid methods are investigated. The preconditioning method is introduced to reduce the condition number of discrete governing equations. 6 preconditioners including a point, line and diagonalized line solvers are implemented and applied to 2-dimensional inviscid flow problems. Theoretical Fourier analyses and numerical results are presented for the preconditioners.
성춘호 대한통증학회 2004 The Korean Journal of Pain Vol.17 No.2
Often, pain is felt in a part of a person's body that is considerably remote from the tissue causing the pain, which is called referred pain. Referred pain is an acute sensation felt at a body location other than that of the location of the diseased or injured part actually causing the pain. Visceral afferent activity arising from abdominal visceral organs, and input from overlying somatic structures, converge onto the neurons of the lower thoracic, thoracolumbar and lumbosacral segments. This convergence of somatic and visceral inputs onto discrete populations of the dorsal horn projection neurons provides an important concept in the phenomenon of referred pain. Many second-order neurons in the spinal cord respond to a variety of inputs from primary afferents, with either visceral or somatic receptive fields, which is an example of a convergent input. In other instances, convergence is the result of primary afferent C-fibers with both visceral and cutaneous collaterals. When an afferent input arises from both somatic and visceral structures, or from separate somatic foci, the perception of pain may depend on the level of combined neuronal activity from both components. Interruption of one limb from the convergent inputs may be sufficient to provide complete pain relief, leading to false assumptions about the source of the pain. In conclusion, as pain clinicians, pursuing expertise in this field, more care should be taken in finding the real causes of pain to facilitate real pain treatment.