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이윤경,이재명,김원일 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.2
신소재인 탄소섬유강화 플라스틱(CFRP)을 피삭재로 선삭가공을 통하여 섬유각의 변화에 따른 절삭저항에 관하여 관찰하였다. 절삭저항은 섬유각 절삭깊이가 클수록 증가하고, 섬유각 15˚ 90˚ 는 절삭속도 40m/min 이상에서 절삭저항이 작아지나, 섬유각 45˚ 60˚ 에서는 절삭속도 40m/min 이상에서 절삭저항이 급격히 증가함을 알 수 있었다. 이송분력이 주분력 배분력보다 거의 2배 가까이 큰것은 섬유의 각도가 클수록 섬유의 방향이 이송방향에 미치는 영향이 크기 때문이라고 생각 된다. CFRP의 최적가공조건은 섬유각 15˚절삭속도 60m min임을 알 수 있다. Carbon Fiber Reinforced Plastic(CFRP), one of the new materials, was investigated about cutting resistance according to the change of fiber angle through in turning Cutting resistance, increases as the fiber angle increases. At the fiber angle of 15˚and 90˚ cutting resistance decreases for the cutting speed more than 40m/min. At the fiber angle of 45˚ and 60˚ cutting resistance increases for the cutting speed less than 40m' min becomes nearly two times the principal force the direction of fiber largely influence upon feed direction. Optimum cutting condition of CFRP can be found to the fiber angle 15˚and cutting speed of 60m/min.
119 구급대원의 노인학대 인식, 신고 및 교육 경험에 관한 연구
채명정,윤종근,김보영,Chae, Myeong-Jeong,Yun, Jong-Geun,Kim, Bo-Young 한국응급구조학회 2017 한국응급구조학회지 Vol.21 No.2
Purpose: The study investigated the perception, report, and education of elder abuse in 119 emergency medical technicians (EMTs) in Korea. Methods: A self-reported questionnaire was distributed to 110 EMTs in K city, and 100 answers were collected from June 1 to 10, 2015. The study instrument was perception regarding elder abuse and education inventory developed by Kim and Kim. Data were analyzed using SPSS/WIN 18.0 version. Results: The elder abuse perception score was 3.81 on a Likert 4-point scale. Physical abuse was the most common type, followed by verbal, financial, negligence, and emotional abuse. Most EMTs recognized that is important for the prevention of elder abuse, but most of them had no experience in reporting abuse. A majority of the EMTs had attended an elder abuse program and recognized the importsnce of such program. Conclusion: This study suggests the necessity of more targeted education of elder abuse prevention combined with family counseling methods and practical approach toward awareness of elder abuse.
Yun, Yeo-Myeong,Kim, Myungchan,Kim, Hyojeon,Kim, Dong-Hoon,Kwon, Eilhann E.,Kang, Seoktae Elsevier 2019 Journal of environmental management Vol.234 No.-
<P><B>Abstract</B></P> <P>Demineralization is required in upgrading low-grade coal to serve as an alternative energy resource for the production of fuel and valuable chemicals but generates a large amount of low-grade coal wastewater (LCWW). The objective of this study was to investigate the effects of a co-substrate on an anaerobic membrane bioreactor (AnMBR) treating LCWW. CH<SUB>4</SUB> was not produced during the operation fed by LCWW alone. When yeast wastes (YW) were supplemented, there was a gradual increase in the biodegradability of LCWW, achieving 182 CH<SUB>4</SUB> mL/g COD with 58% COD removal efficiency. The analysis of physicochemical characteristics in the effluent of AnMBR, done by excitation-emission matrix (EEM) and size exclusion chromatography (SEC), showed that the proportion of soluble microbial products (SMPs) and aromatic group with high-molecular weight (>1 kDa) increased. Microbial analysis revealed that the increased dominance of bacteria <I>Comamonas</I>, <I>Methanococcus,</I> and <I>Methanosarcina</I> facilitated biodegradation of LCWW in the presence of YW.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Enhanced biodegradation of low-grade coal wastewater by adding yeast extract. </LI> <LI> Increased soluble microbial products and aromatic groups with high molecular weight. </LI> <LI> Increased dominance of bacteria <I>Comamonas</I>, <I>Methanococcus,</I> and <I>Methanosarcina</I>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Study on Prevalence and Risk Factors for Varicose Veins in Nurses at a University Hospital
Yun, Myeong-Ja,Kim, Young-Ki,Kang, Dong-Mug,Kim, Jong-Eun,Ha, Won-Choon,Jung, Kap-yeol,Choi, Hyun-Woo Occupational Safety and Health Research Institute 2018 Safety and health at work Vol.9 No.1
Background: Lower-limb varicose veins (VVs) are common and known to have a higher prevalence among people who work in occupations requiring prolonged standing. In the Republic of Korea, however, VV-related occupational factors have seldom been examined. This study was conducted to assess the prevalence of VVs among nurses, an occupational group considered to be at high risk of VVs, and determine the occupational risk factors of prolonged standing. Methods: Between March and August 2014, a questionnaire survey coupled with Doppler ultrasonography was conducted on the nurses working at a university hospital. Results: A total of 414 nurses participated in the survey and diagnostic testing. From the survey analysis and test results, the prevalence of VVs in nurses was estimated to be 16.18%. Significant factors for venous reflux were age [odds ratio (OR) = 1.06, 95% confidence interval (CI) = 1.03-1.10], pregnancy (OR = 2.15, 95% CI = 1.17-3.94), and delivery (OR = 2.02, 95% CI = 1.08-3.78). The statistical significance of these factors was verified after risk adjustment for sociodemographic factors (OR = 3.40, 95% CI = 1.27-9.09). Conclusion: Factors significantly associated with venous reflux were increasing age and prolonged working hours (${\geq}4hours$) in a standing position (OR = 2.80, 95% CI = 1.08-7.25), even after risk adjustment for sociodemographic factors. This study is significant in that an objective diagnosis of VVs preceded the analysis of the risk factors for VV incidence, thus verifying objectively that VVs are associated with occupations requiring prolonged hours of working in a standing position.
Kim, Sung-Hwan,Yun, Sung-Cheol,Park, Jin Joo,Lee, Sang Eun,Jeon, Eun-Seok,Kim, Jae-Joong,Cho, Myeong-Chan,Chae, Shung Chull,Kang, Seok-Min,Choi, Dong-Ju,Yoo, Byung-Su,Kim, Kye Hun,Oh, Byung-Hee,Baek, The Korean Society of Cardiology 2019 Korean Circulation Journal Vol.49 No.3
<P><B>Background and Objectives</B></P><P>Beta-blockers are indicated in patients with heart failure (HF) with reduced ejection fraction. However, their efficacy in patients with HF with preserved ejection fraction (HFpEF) is uncertain. We investigated the hypothesis that beta-blockers are associated with reduced adverse events in patients with HFpEF.</P><P><B>Methods</B></P><P>The Korea Acute Heart Failure (KorAHF) is a prospective observational multicentre cohort study. The 5,625 patients hospitalized for acute HF syndrome in 10 tertiary university hospitals across the country have been consecutively enrolled between March 2011 and February 2014. Of these patients, 2,152 patients with HFpEF (ejection fraction ≥40%) were investigated. The primary outcome was all-cause mortality according to beta-blocker use.</P><P><B>Results</B></P><P>During a median follow-up duration of 807 days, 702 patients died. In Cox proportional hazards model beta-blocker use was associated with a 14% reduced all-cause death (hazard ratio [HR], 0.86; 95% confidence interval [CI], 0.75–0.98), but not with reduce rehospitalization (HR, 1.03; 95% CI, 0.85–1.27). In the propensity-score matched population, beta-blockers were also associated with reduced all-cause death (HR, 0.80; 95% CI, 0.69–0.94) but not with reduced rehospitalization (HR, 1.08; 95% CI, 0.87–1.33).</P><P><B>Conclusions</B></P><P>In Korean patients with HFpEF, use of beta-blockers is associated with reduced all-cause death but not with reduced rehospitalization.</P>
Kim, Ji-Seok,Kim, Yun-Jae,Lee, Myeong-Woo,Jeon, Jun-Young,Kim, Jong-Sung Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.2
This paper presents numerical estimation of burst pressures of axial cracked U-bend tubes, considering the U-bending process analysis. The validity of the FE simulations is confirmed by comparing with published experimental data. From parametric analyses, it is shown that existing EPRI burst pressure estimation equations for straight tubes can be conservatively used to estimate burst pressures of the U-bend tubes. This is due to the increase in yield strength during the U-bending process. The degree of conservatism would decrease with increasing the bend radius and with increasing the crack depth.
Yun-Sik Lee,Jino Son,Yongeun Kim,Myeong seob Kim,Kijong Cho 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
The use of insect growth regulators (IGRs) has been gaining popularity as an environmentally friendly option to improve existing integrated pest management (IPM) strategies. Although IGRs have a selective effect on target organisms, they may exert a more selective effect on non-target organisms. In this study, the toxic effects of teflubenzuron on biological traits of P. rosea, Collembola, were assessed in the OECD artificial soil under two different exposure conditions, one was exposed in the bulk soil, and the other was exposed in the compacted soil which unidirectional force was applied to the soil surface. After 28 days of exposure, the toxicity of teflubenzuron on the survival and juvenile production of P. rosea in the bulk system was more toxic than that of the compact system. Moreover, not only the egg production but also the hatching rate and molting frequency of P. roseas was decreased in a concentration dependent manner. These results suggest that the IGRs teflubenzuron exhibit significant impacts on the biological traits of non-target organisms P. rosea and its toxic effects are differently assessed depending on the exposure conditions.