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입원 중인 베트남 참전 군인의 삶의 만족도와 관련된 요인
김애리,박종,김율,노희송,박광희,김은숙,김형철,홍강식,류소연,강명근,김기순 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2
Background and Objectives: The aim of the study was to identify the factors associated with life satisfaction of hospitalized Vietnam veterans. Material and Methods: The data were collected from 200 hospitalized Vietnam veterans of 5 veterans hospitals in Korea from September 13 to 23, 2004. Information of general characteristics, health behavior, disease history, family function, depression and life satisfaction were collected by structured questionnaire. Results: The mean of life satisfaction was 21.48(±6.03), and the mean of depression was 53.10(±9.64). The prevalence of depression was mild depression 24.0%, moderate depression 43.5% and severe depression 25.0%. Depression was associated with life satisfaction and depression was higher, life satisfaction was lower. Family function and age were positively associated with life satisfaction, Conclusion: Life satisfaction was affected by depression and family function in hospitalized Vietnam veterans. Therefore, it was thought that psychosocial approaches such as improve depression and family function in care of hospitalized Vietnam veterans is required.
So, Soon-Youl The Korean Institute of Electrical Engineers 2004 KIEE International Transactions on Electrophysics Vol.4C No.5
We have examined a technique of one-dimensional (1D) fluid modeling for radio-frequency Ar capacitively coupled plasmas (CCP) between unequal-sized powered and grounded electrodes. In order to simulate a practical CCP reactor configuration with a grounded side wall by the 1D model, it has been assumed that the discharge space has a conic frustum shape; the grounded electrode is larger than the powered one and the discharge space expands with the distance from the powered electrode. In this paper, we focus on how much a 1D model can approximate a 2D model and evaluate their comparisons. The plasma density calculated by the 1D model has been compared with that by a two-dimensional (2D) fluid model, and a qualitative agreement between them has been obtained. In addition, 1D and 2D calculation results for another reactor configuration with equal-sized electrodes have also been presented together for comparison. In the discussion, four CCP models, which are 1D and 2D models with symmetric and asymmetric geometries, are compared with each other and the DC self-bias voltage has been focused on as a characteristic property that reflects the unequal electrode surface areas. Reactor configuration and experimental parameters, which the self-bias depends on, have been investigated to develop the ID modeling for reactor geometry with unequal-sized electrodes.
SF<SUB>6</SUB>/N₂ 혼합기체의 DC 플라즈마 특성 분석
소순열(Soon-Youl So) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
SF6 gas has been used for power transformers or gas insulated switchgears, because it has the superior insulation property and the stable structure chemically. It has been, however, one of global warming gases and required to reduce the its amount. Some papers have reported that its amount could be reduced by mixing with other gases, such as N₂, CF₄, CO₂ and C₄F8 and their mixture gases would cause the synergy effect. In this paper, we investigated the characteristics of DC plasmas on SF6 mixture gases with N₂ at atmospheric pressure. N₂ gas is one of cheap gases and has been reported to show the synergy effect with mixing SF6 gas, even though N₂ plasmas have electron-positive characteristics. 38 kinds of SF6/N₂ plasma particles, which consisted of an electron, two positive ions, five negative ions, 30 excitation and vibration particles, were considered in a one dimensional fluid simulation model with capacitively coupled plasma chamber. The results showed that the joule heating of SF6/N₂ plasmas was mainly caused by positive ions, on the other hand electrons acted on holding the SF6/N₂ plasmas stably. The joule heating was strongly generated near the electrodes, which caused the increase of neutral gas temperature within the chamber. The more N₂ mixed-ratio increased, the less joule heating was. And the power consumptions by electron and positive ions increased with the increase of N₂ mixed-ratio.
소순열(Soon-Youl So) 대한전기학회 2010 전기학회논문지 P Vol.59 No.4
Atmosphere Plasma of Gas Discharge (APGD) has been used in plasma sources for material processing such as etching, deposition, surface modification and so on due to having no thermal damages. The APGD researches on AC source with high frequency have been mainly processed. However, DC APGD studies have been not. In order to understand APGD further, it is necessary to study on fundamental properties of DC APGD. In this paper, we developed a one-dimensional fluid simulation model with capacitively coupled plasma chamber at the atmosphere pressure (760 [Torr]). Nine kinds of Ar discharge particles such as electron (e), positive ions (Ar?, Ar₂?) and neutral particles (Arm*, Arr*, Arh*, Ar₂*(1), Ar₂*(3) and Ar gas) are considered in the computation. The simulation was worked at the current range of 1~15 [mA]. The characteristics of voltage-current were calculated and the structure of Joule heating were discussed. The spatial distributions of Ar DC APGD and the mechanism of power consumption were also investigated.
소순열(Soon-Youl So) 대한전기학회 2010 전기학회논문지 P Vol.59 No.2
SF? gas would be used in power transformer, GIS (Gas insulated switchgear) and so on because of its electrically superior insulation and chemically stable structure. Recently, the reduction of SF? is required to avoid global warming and the researches on the dilution of SF? with other gases have been carried out. SF? mixture gases with N₂ and CxFy have drawn attention to the synergy effect. However, in order to understand the mechanism of the synergy effect, it is important to analyze and evaluate properties of mixture gases quantitatively. In this paper, we investigated the mechanism of synergy effect from electron collision processes and electron energy distribution by solving Boltzmann equation with propagator method. Three kinds of gases for dilution of SF? (SF?/N₂, SF?/CF₄ and SF?/C₄F?) are considered in this simulation. On the properties of SF?/N₂ mixture gas, the variation of reduced electric field was shown highly within 0%~40% mixtures of SF?. And the more low-level electron energy has been distributed, the higher insulation capability has appeared.
소순열(Soon-Youl So),이진(Jin Lee) 대한전기학회 2009 전기학회논문지 P Vol.58 No.4
Atmosphere Plasmas of Gas Discharge (APGD) have been used in plasma sources for material processing such as etching, deposition, surface modification, etc. This study is to investigate and understand the fundamental plasma discharge properties. Especially, SF?/N₂ mixed gas would be used in power transformer, GIS (Gas insulated switchgear) and so on. In this paper, we developed a one dimensional fluid simulation model with capacitively coupled plasma chamber at the atmosphere pressure (760 [Torr]). 38 kinds of SF?/N₂ plasma particles which are an electron, two positive ions (SF??, N₂?), five negative ions (SF??, SF??, SF₄?, F₂?, F₁?), thirty excitation and vibrational particles for N₂ were considered in this computation. The N₂ gases of 20%, 50%, 80% were mixed in SF? gas. As the amount of N₂ gas was increased, the properties of electro-negative plasma moved toward the electro-positive plasma.