• 보건행정학회지
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• 제27권1호
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• pp.47-55
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• 2017

Background: This study purposed to analyze the effects of metabolic syndrome on the total medical charge of patients. Methods: 2013 National Health Insurance Service sample research database (eligibility database, medical database, and health examination database) was used for this study. Gamma regression was applied to analyze the effects of metabolic syndrome on the total medical charge and logistic regression was used to determine the probability of medical charge which was higher than the third quartile. Sociodemographic characteristics (age and household income), health behavior factors (smoking, drinking, exercise, and body mass index), and disease related factors (family history and metabolic syndrome) were included as the independent variables. Results: people who had metabolic syndrome spent more medical expenses than those without metabolic syndrome both in man and woman group. The standard regression coefficient was 0.09 (p< 0.001) in man with metabolic syndrome and 0.16 (p< 0.001) in woman. In addition, woman with metabolic syndrome spent more than the third quartile of medical charge. The odds ratios was 1.04 (p= 0.16) for man with metabolic syndrome and 1.18 (p= 0.013) for woman. Conclusion: people with metabolic syndrome spent more medical charge, so it will need to consider policy interventions for preventing the incidence and management of metabolic syndrome in Korean people.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.350-351
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• 2005

The electrochemical behavior of Si-C material synthesized by heating the mixture of silicon and polyvinylidene fluoride (PVDF). Coin cells of the type 2025 were made using the synthesized material and the electrochemical studies were performed. Si-C/Li cells were made by using the developed Si-C material. Charge/discharge test was performed at 0.1C hour rate. Initial charge and discharge capacities at Si-C material derived from 20 wt.% of PVDF was found to be 1,830 and 526 mAh/g respectively. Initial charge/discharge characteristics of the electrode were analyzed. The level of reversible specific capacity was about 216 mAh/g at Si-C material derived from 20 wt.% of PVDF, IIE, intercalation efficiency at initial charge/discharge, was 68 %. Surface irreversible specific capacity was 31 mAh/g, and average specific resistance was 2.6 ohm*g.

• Bulletin of the Korean Chemical Society
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• 제35권2호
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• pp.457-465
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• 2014

Size-controlled lead sulfide (PbS) quantum dots were synthesized by the typical hot injection method using oleic acid (OA) as the stabilizing agent. Subsequently, the ligand exchange reaction between OA and thioacetic acid (TAA) was employed to obtain TAA-capped PbS quantum dots (PbS-TAA QDs). The condensation reaction of the TAA ligands on the surfaces of the QDs enhanced the conductivity of the PbS-TAA QDs thin films by about 2-4 orders of magnitude, as compared with that of the PbS-OA QDs thin films. The electron transport mechanism of the PbS-TAA QDs thin films was investigated by current-voltage (I-V) measurements at different temperatures in the range of 293 K-473 K. We found that the charge transport was due to sequential tunneling of charge carriers via the QDs, resulting in the thermally activated hopping process of Arrhenius behavior.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계학술대회논문집
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• pp.318-323
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• 2005

This paper introduces the mechanism of the ESD (Electrostatic discharge) in the HDD spindle system using FDBs (Fluid Dynamic Bearings). When a HDD (Hard Disk Drive) spindle system is rotating, triboelectric charging occurs in the FDBs through the friction of the lubricant between the rotating shaft and stationary sleeve. And this electrostatic charge is accumulated in the rotating part of the HDD spindle system because it is insulated from the ground by the lubricant. This research shows experimentally that the behavior of electric charge and discharge in the FDB spindle system is the same as that of a capacitor. It also measures the electrostatic charge and discharge of the FDB spindle system due to the chanse of humidity, supporting load and motor speed. This research shows that the control of ESD is required in the HDD spindle system using FDBs, because the electrostatic charge accumulated in the FDB spindle system may cause the breakdown damage of the GMR head and data loss consequently.

• 한국융합학회논문지
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• 제8권12호
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• pp.351-357
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• 2017

본 연구는 한국과 중국의 리더십 행동 특성이 조직시민행동에 미치는 영향에 미치는 요인을 파악한 연구로 PLS 방법을 사용하여 분석을 수행하였다. 본 연구는 한국과 중국 대학생을 대상으로 리더십 행동 특성이 조직시민행동에 미치는 영향에 대한 분석을 수행 하였다. 리더십 행동 특성이 조직시민행동에 긍정적 영향을 미치는 것으로 나타났으며, 조절효과는 없는 것으로 나타났다. 본 연구의 결과는 대학생들 외에도 리더십에 대한 교육을 진행하고 있는 교육기관에서 실무적으로 활용이 가능할 것으로 보이며, 리더의 행동 특성에 대한 기본적인 소양을 함양하기 위한 방향성을 모색하는데 도움을 줄 수 있을 것으로 보인다.

• KIEE International Transactions on Electrophysics and Applications
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• 제4C권1호
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• pp.21-25
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• 2004

From the gradual increasing state of charge (GISOC) observations, electrochemical behavior of multi-walled carbon nanotube│(lM LiP $F_{6}$ , EC,DEC,DME 3:5:5 volume ratio)│lithium cells was evaluated using the galvanostatic charge-discharge process. A MWCNT delivers a specific charge capacity of 1,300 mAh/g in a Li cell when cycled up to an end voltage of 0 V (vs. Li/L $i^{＋}$ )at a constant current rate every 10 hours. However, in the present study, the specific discharge capacity obtained is 338 mAh/g, thus amounting to a coulombic efficiency of only 26％. Further, when the MWCNT│Li cells were tested using the GISOC method, two distinguishable linear-fit ranges were observed due to the intercalation/deintercalation of lithium, which were found to have II $E_1$, IIC $s_1$ and II $E_2$of 27.3％, 372 mAh/g, and 25.5％, respectively. Q $c_1$, could be calculated from the data of IIE and IICs of each range by the modified equation "II $C_{sum}$= $\Sigma$( $Q_{C}$- $Q_{D}$)=(II $E_{1}$$^{-1}$ ) $Q_{Dl}$ ＋(II $E_2$$^{-1}$ -1) ( $Q_{D2}$- $Q_{Dl}$ ) ＋ IIC $s_1$= $Q_{Cl}$ - $Q_{Dl}$ ". Results of the GISOC method could be converted to the results of galvanostatic charge-discharge process, irrespective of the state of charge of the cell or battery.ery.y.y.

• International Journal of Contents
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• 제10권2호
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• pp.28-36
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• 2014

This study attempted to suggest a strategy for providing rural community tourism information services using smartphones. Study subjects were men and women among 300 who currently use smartphones. Empirical analysis was done on 249 of the 300 subjects. Upon verification of the effect factors of adults' smartphone usage and rural community tourism information services usage, they were both statistically significant based on Ajzen's(1991) Theory of planned behavior. Hence, behavior, subjective norms, perceived behavioral control should be augmented in order to increase smartphone usage behavior to access rural community tourism information services. Especially, behavioral intent and usage behavior was increased proportionately to behavioral control. We suggested that plans to provide applications free of charge and building a social consensus on utilizing rural community tourism information are important in achieving such status.

• 대한환경공학회지
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• 제37권11호
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• pp.649-655
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• 2015

본 연구에서는 막 기반 수처리 기술의 핵심인 막 성능 및 특성을 혁신적으로 개선시키기 위한 새로운 형태의 막으로서 그래핀과 세라믹을 결합하는 세라믹 기반 그래핀 막(Ceramic-based graphene membrane (CbGM))을 만들고, 막에서 일어나는 물질 이동 특성을 파악하였다. 수투과 및 염 제거의 역할을 하는 활성층으로서 그래핀이 사용되었으며, 간단한 Filtration-assisted assembly (FAA) 방법을 도입하여 막을 합성하였다. 합성한 막의 표면 형태 및 특성 분석을 위해 주사전자 현미경 및 접촉각을 분석하였으며, 막 성능 및 특성 파악을 위해 3가지 용질(i.e., NaCl, $MgCl_2$, $Na_2SO_4$)을 회분식 정삼투 시스템에서 용질 이동을 측정하였다. 표면 형태 특성 분석과 물질 이동 결과를 통해, 그래핀 층의 두께 보다는, 활성층을 구성하는 그래핀 조각들 사이의 교합(Interlocking)이 막에 선택성 부여함에 있어서 가장 중요함을 확인하였다. 또한, 농도차를 구동력으로 하는 막 공정에 CbGM을 적용하였을 때, 수중의 음이온과 양이온의 최외각 전하비($Z^-/Z^+$)값이 증가할수록 용질 이동이 비례적으로 촉진되었으므로, CbGM의 표면이 양으로 하전되어 있으며, 이것이 전하된 물질의 이동에 매우 큰 영향을 끼친다는 것을 확인하였다.

• Bulletin of the Korean Chemical Society
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• 제33권10호
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• pp.3473-3476
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• 2012

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2010년도 임시총회 및 하계학술연구발표회
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• pp.72-72
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• 2010