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송선진,박관진,이지한,김상철,김훈,이석우 대한의학회 2020 Journal of Korean medical science Vol.35 No.35
Background: Suicide among the elderly is a public health concern, as life expectancy is increasing rapidly and suicide rates increase with age. In Korea, self-poisoning is the most common method of attempted suicide. This study aimed to evaluate the characteristics of attempted suicide by self-poisoning among the elderly and to identify risk factors related to the suicide attempts. Methods: A cross-sectional observational study was conducted using the Emergency Department-based Injury In-depth Surveillance database in Korea. We included all adult patients visiting the emergency department (ED) who attempted suicide by poisoning between January 2011 and December 2017 and stratified according to age: the elderly (≥ 65 years old) and the younger group. Characteristics and risk factors for attempted suicide by poisoning among the elderly were evaluated using stepwise regression analysis. Results: Among 25,904 adult patients, 5,164 (19.9%) were classified as elderly. The elderly were more likely to be admitted to hospital and intensive care units, the average ED length of stay was longer, and total mortality was higher than that of the younger group. Male sex, low socioeconomic status, poor physical health, pesticide use, lower alcohol consumption, and fewer prior suicide attempts were found to be risk factors for suicide among the elderly. Conclusion: Self-poisoning among the elderly is associated with poorer clinical outcomes than in younger adult patients. Suicide among the elderly is a potentially preventable public health problem, and with proper identification of the associated risk factors, appropriate multidisciplinary intervention strategies can be implemented.
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Micro-Macro Simulation of Dumbbells
송선진 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
The traditional simulation of polymeric liquid is classified into the macroscopic approach and microscopic approach. The former solves constitutive equation, conservation equation while the latter solves the extra stress using dynamics of a large collection of polymeric molecules in homogeneous flow. Recently there have been various tries, so-called CONNFFESSIT which combines the microscopic Brownian dynamics simulations with the macroscopic finite element method to get more realistic solution. However, due to massive stochastic calculation, these simulations can get only the solution of a few parameters in simple geometry. In this study, we simulate 4:1 contraction flow of Hookean, FENE dumbbells as Weissenburg number increases using Brownian Configuration Field method and parallel solver. Compared to Hookean dumbbell, FENE dumbbell predicts larger stress at the start and smaller stress at the steady state. In both case of Hookean and FENE dumbbell simulation, corner and lip vortex appeared, and the size of vortices are similar but the intensity of FENE dumbbell is weaker than Hookean dumbbell. More accurate modeling is possible through micro-macro simulation.
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수소화물 발생-유도결합플라스마 질량분석법에 의한 철강 중의 납의 정량
박창준,송선진,이동수,Park, Chang Joon,Song, Sun Jin,Lee, Dong Soo 한국분석과학회 2001 분석과학 Vol.14 No.5
철강 시료 중의 납 분석을 위하여 수소화물 발생법을 플라스마에 납을 선택적으로 주입하고 유도결합플라스마 질량분석법으로 측정하는 분석법을 개발하였다. 납 수소화물 $PbH_4$의 생성을 위해서는 $NaBH_4$와 반응 전에 먼저 준안정 상태의 Pb(IV)로 만들어주기 위하여 산화제가 필요하다. $1000{\mu}g/mL$ 이상의 철 매질을 함유하는 시료용액으로 납 수소화물을 발생시키기 위한 최적조건을 찾는 연구를 수행하였다. 철 매질이 $10{\mu}g/mL$ 이상 존재할 때는 $K_2Cr_2O_7$이 효과적인 산화제로 작용하였으며 젖산을 가하여 감도를 향상시켰다. 시료용액의 산농도 그리고 산화제와 젖산 농도의 최적값은 철 매질의 농도에 따라 달랐다. 동위원소 희석법을 사용하여 납을 정량하였으며 철강 표준물질 NIST SRM 361, 362 분석결과는 불확도 범위안에서 검정값과 잘 일치하였다. An analytical method has been developed which determines lead in steel samples by inductively coupled plasma mass spectrometry (ICP-MS) with sample introduction by the hydride generation. The lead hydride is not stable and requires and oxidant for the oxidation into metastable Pb(IV) before reduction to $PbH_4$ with $NaBH_4$. A study was carried out to find and optimum lead hydride generation condition for a sample solution with more than $1000{\mu}g/mL$ Fe matrix. $K_2Cr_2O_7$ was found to work as an efficient oxidant when more than $10{\mu}g/mL$ Fe matrix was present. Lactic acid was used with the oxidant as a complexing agent of the metastable Pb(IV) to enhance sensitivity. Optimum concentrations of the sample acidity, oxidant and lactic acid were different depending on the matrix concentration. The isotope dilution method was employed for the quantitation of lead. The determined Pb concentrations of the NIST steel SRM 361 and 362 were in good agreement with the certified values within the uncertainty range.
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Orientation and deformation of FENE dumbbells in confined microchannel and contraction flow geometry
안경현,송선진,김주민,이승종,여종기 한국유변학회 2007 Korea-Australia rheology journal Vol.19 No.3
The orientation and deformation of polymer chains in a confined channel flow has been investigated. The polymer chain was modeled as a Finitely Extensible Nonlinear Elastic (FENE) dumbbell. The Brownian configuration field method was extended to take the interaction between the flow and local chain dynamics into account. Drag and Brownian forces were treated as anisotropic in order to reflect the influence of the wall in the confined flow. Both Poiseuille flow and 4 : 1 contraction flow were considered. Of particular interest was molecular tumbling of polymer chains near the wall. It was strongly influenced by anisotropic drag and high shear close to the wall. We discussed the mechanism of this particular behavior in terms of the governing forces. The dumbbell configuration was determined not only by the wall interaction but also by the flow type of the geometric origin. The effect of extensional flow on dumbbell configuration was also discussed by comparing with the Poiseuille flow.
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Nanometer-sized BaTiO3 Dielectric Layer for Inorganic Electroluminescence
김진영,정동근,박상현,정태원,배민종,송선진,이정희,한인택,유세기 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
The effect of the size of a ferroelectric barium titanate BaTiO3 powder on the dielectric layer of an inorganic powder electroluminescent (EL) device was investigated-two nanometer (300 and 500 nm)-sized and one micrometer (2 µm)-sized powder were chosen. Improvements in the dielectric properties, such as a high dielectric constant and a low dielectric loss, were achieved for the nanometer-sized BaTiO3 powders. These dielectric properties could lead to an increased charge density in the phosphor primarily due to the increased specific surface area of the BaTiO3 powder particles in the dielectric layer, where the increased specific surface area arises from the high packing density of the BaTiO3 powder. Based on the above results, nanometer-sized BaTiO3 powder particles enhanced the brightness and the efficiency of the EL device, which helped to expand the potential applications of the EL devices.
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