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고속열차 교행시 차량 실내 · 외 압력변동에 관한 수치적 연구
문성목(Seongmok Moon),이경훈(Kyounghoon Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
A three-dimensional unsteady computational study is performed to assess the inside and outside pressure variation of two high-speed trains passing by each other, and to estimate the aural discomfort of the passenger through comparisons between the computed results and the safety criterion of domestic trains. The dynamic mesh technique and the smooth starting approach are adopted to simulate the transient vehicle movement. During passing by each other in the tunnel, complex pressure wave interactions within the tunnel occur due to the pressure waves by the opposite train. It leads to the rapid pressure variation on the internal and external surface of vehicle, and finally results in the aural discomfort of the passengers. Computed results show that the internal maximum pressure variations during passing by each other in the tunnel meet the safety criterion of vehicle. In addition, the internal maximum pressure variation when two trains pass by each other in the tunnel increase 1.5 to 2 times more than that when one train travels in the tunnel.
문성목(Seongmok Moon),노주현(Joohyun Rho),이경훈(Kyounghoon Lee) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
In this study, a 3-dimensional transient computational study is carried out to estimate the effect of pressure wave for high speed trains that are crossing in open air or tunnel at 350km/h speed. The dynamic mesh technique is applied to simulate the reciprocal motion of high speed trains, and the initial condition using a smooth starting method is adopted to eliminate a numerical pressure wave that may initially take place by the impulsive start. Pressure waves give rise to large pressure transients that a positive-negative pulse pressure is generated as the train head passes another train, which a negative-positive pulse as the train tail passes. Pressure wave characteristics for the crossing of high speed trains are represented through the numerical analysis, which predicts resultant aerodynamic forces by pressure transient acting on the trains.
Yang, Changyol,Moon, Kyounghoon,Song, Jae-Won,Kim, Jiwon,Lee, Jung-Ho,Lim, Jae-Hong,Yoo, Bongyoung The Electrochemical Society 2018 Journal of the Electrochemical Society Vol.165 No.5
<P>A novel method using an all-wet process to reduce the cost of material in Si-based devices is described, called the electroless and electrodeposit-assisted stripping (E(2)AS) process. In this approach, a highly adhesive electroless Ni nanorod seed layer is formed on the Si substrate in place of a conventional high-cost physical vapor deposition (PVD) process. Then, a highly stressed Ni film is electrodeposited as the stress layer for lift-off of the Si thin film. Using the E2AS method, a thin Si film can be repetitively detached from a Si substrate without kerf loss, reducing the solar cell manufacturing cost. (C) 2018 The Electrochemical Society.</P>
Ryan Rhee,Kyounghoon Moon,Bongyoung Yoo 한국표면공학회 2018 한국표면공학회지 Vol.51 No.4
Permalloy(Ni80-Fe20) which is known for its soft magnetic properties is a well-known material that has been studied intensively. Permalloy nanoflakes were fabricated with the combination of electrodeposition and sonication process. Ultrasonic power was applied to the deposited alloy which produced nanoflakes in forms of sheet. High internal stress created cracks which helped the peeling of permalloy into nanosheets. Because of shape anisotropy, flakes could be aligned by magnetic field. The magnetic properties of the nanosheets were observed, and the variation of magnetic properties with the alignment of flake was also investigated.
Kang, Woong Chol,Il Moon, Chan,Lee, Kyounghoon,Han, Seung Hwan,Suh, Soon Yong,Moon, Jeonggeun,Shin, Mi Seung,Ahn, Taehoon,Shin, Eak Kyun Lippincott Williams Wilkins, Inc. 2011 Coronary artery disease Vol.22 No.8
BACKGROUND: We compared the relationship between inflammatory markers and neointimal hyperplasia (NIH) after drug-eluting stent (DES) implantation. METHODS: We implanted a single DES in 42 consecutive patients with stable angina. The plasma high-sensitivity C-reactive protein (hs-CRP), interleukin-6 (IL-6), and matrix metalloproteinase-9 (MMP-9) levels were measured before, and 24 and 72 h after the procedure. Angiography and intravascular ultrasound were performed. RESULTS: No relationship was noted between the baseline hs-CRP level and NIH. A significant positive correlation was noted between NIH and the hs-CRP level obtained at 24 h (r=0.435, P=0.004), and 72 h (r=0.334, P=0.031) after the procedure. Interestingly, there was a positive correlation between the change (&Dgr;) in the hs-CRP level and NIH at 24 h (r=0.414, P=0.006). The fourth quartile of the hs-CRP at 24 h after percutaneous coronary intervention (PCI) had significantly larger volume of NIH than the first quartile (20.1±25.1 vs. 2.7±6.4 mm, P<0.05). Moreover, NIH in the fourth quartile (20.9±26.4 mm) was higher than the first quartile (3.3±8.6 mm) of the &Dgr; hs-CRP level at 24 h (P<0.05) after the procedure. Although the IL-6 level at the baseline and 72 h after the procedure were positively correlated with NIH (r=0.337, P=0.029 and r=0.435, P=0.004, respectively), the &Dgr; IL-6 level at any stage was not correlated with NIH. Neither the MMP-9 level nor the &Dgr; MMP-9 level at any stage was correlated with NIH. CONCLUSION: This prospective intravascular ultrasound study showed the inflammatory response after PCI, as measured by hs-CRP levels, but not the baseline hs-CRP level, predict NIH after DES implantation. Neither a change in the IL-6 nor MMP-9 levels at any stage after PCI reflected NIH.
국민기초생활보장제도의 비수급 원인에 관한 질적 연구 -동태적 모델에 기반을 둔 틀분석-
허용창 ( Heo Yong-chang ),한경훈 ( Han Kyounghoon ),김동진 ( Kim Dongjin ),문혜진 ( Moon Hyejin ) 한국사회복지정책학회 2020 사회복지정책 Vol.47 No.1
본 연구는 서울에 사는 비수급 빈곤층의 심층면접을 통해 그들의 기초보장 신청 경험을 van Oorschot(1996)의 동태적 모델에 기반을 둔 틀분석 방법으로 분석함으로써 비수급 빈곤의 원인을 고찰한 질적 연구이다. 틀분석에 의한 비수급의 원인의 주요 결과는 다음과 같다. 첫째, 기초보장의 신청을 고려하기 전 단계인 ‘진입 단계’에서 일부 비수급 빈곤층은 제도에 관한 정보가 부족하거나 정책 이해도가 낮아 기초보장 신청 의사를 갖지 못하였다. 신청 탈락자(혹은 수급 중지자)도 탈락 사유를 정확히 알지 못하거나, 생계곤란에도 불구하고 탈락 사유를 소명할 자료를 갖추어 재신청할 의사를 보이지 않기도 하였다. 둘째, 신청을 고려하는 ‘선택 단계’에서는 낙인 효과로 인해 신청 포기 사례를 확인하였다. 주로 근로능력자를 중심으로 수급자가 되는 것에 대한 자존심 하락과 그로 인한 신청의 단념 현상이 나타났다. 셋째, 주민센터에 들러 신청 절차에 착수한 ‘신청 단계’에서는 복잡한 절차로 인한 신청의 중도 포기 현상이 확인되었다. 복잡한 절차로 인한 신청 중도 포기는 가구원 증명 등 까다로운 증빙서류, 부양의무자에 의한 금융정보제공 동의서 미제출, 결정통지까지 긴 조사기간 등의 요인에 의해 발생하였다. 넷째, ‘결정 단계’에서는 선정기준(소득인정액 기준 및 부양의무자 기준)의 미충족으로 인해 탈락하여 비수급자에 머무는 사례가 확인되었다. 이는 복잡한 선정기준, 까다로운 수급자격 증빙서류, 엄격한 자산조사로 대표되는 국민기초생활보장제도의 제도적 복잡성에서 기인한다. 요컨대, 본 연구는 비수급의 동태적 모델에 의거해 진입부터 결정까지 주요 단계별로 비수급의 원인을 포괄적으로 규명하는 한편 선정기준 외에도 신청과정에서 신청자가 직면하는 행정적인 애로사항을 개선하기 위한 연구결과를 도출했다는 의의가 있다. This study is a qualitative study to examine the reasons for non-take-up of the National Basic Livelihood Security Scheme by interviewing the non-take-up in Seoul and analyzing data with the framework analysis grounded on van Oorschot(1996)’s model. Key findings from the framework analysis are as follows. First, non-take-up occasionally takes places in the stage of threshold, because the poor lack of information and the understanding of the public assistance scheme. Even some applicants hardly understand why they are not eligible for the public assistance scheme. Second, several interviewees gave up the application to the scheme in the stage of trade-off, due to stigma to beneficiaries from the public assistance. Particularly, some working-age interviewees who suffer from a lack of self-esteem tend not to apply for the scheme. Third, some interviewees withdrew their applications in the stage of application, because of the complicated process. The complicated process concerns a number of issues faced by the applicants such as evidential documents, consent from parent or offspring for means test, and a long waiting period. Finally, some applicants stay at non-take-up in the stage of screening, because they fail to meet core criteria to be beneficiaries. This mainly stems from the complex policy design including complicated criteria, heavy evidential documents, strict means test. In summary, this study contributes to the understanding of the reasons for non-take-up in a comprehensive manner with a dynamic model of non-take-up. Key findings from the study indicate that the public scheme should be institutionally reformed to reduce current administrative inconveniences.
Sung Woo Kwon,Sang-Don Park,Jeonggeun Moon,Pyung Chun Oh,Ho-Jun Jang,Hyun Woo Park,Tae-Hoon Kim,Kyounghoon Lee,Jon Suh,WoongChol Kang 대한심장학회 2018 Korean Circulation Journal Vol.48 No.11
Background and Objectives: We aimed to compare outcomes of complete revascularization (CR) versus culprit-only revascularization for ST-segment elevation myocardial infarction(STEMI) and multivessel disease (MVD) in the 2nd generation drug-eluting stent (DES) era. Methods: From 2009 to 2014, patients with STEMI and MVD, who underwent primary percutaneous coronary intervention (PCI) using a 2nd generation DES for culprit lesions were enrolled. CR was defined as PCI for a non-infarct-related artery during the index admission. Major adverse cardiovascular event (MACE) was defined as cardiovascular (CV) death, non-fatal myocardial infarction, target lesion revascularization, or heart failure during the follow-up year. Results: In total, 705 MVD patients were suitable for the analysis, of whom 286 (41%) underwent culprit-only PCI and 419 (59%) underwent CR during the index admission. The incidence of MACE was 11.5% in the CR group versus 18.5% in the culprit-only group (hazard ratio [HR], 0.56; 95% confidence interval [CI], 0.37–0.86; p<0.01; adjusted HR, 0.64; 95% CI, 0.40–0.99; p=0.04). The CR group revealed a significantly lower incidence of CV death (7.2% vs. 12.9%; HR, 0.51; 95% CI, 0.31–0.86; p=0.01 and adjusted HR, 0.57; 95% CI; 0.32–0.97; p=0.03, respectively). Conclusions: CR was associated with better outcomes including reductions in MACE and CV death at 1 year of follow-up compared with culprit-only PCI in the 2nd generation DES era.