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李根茂,吳政錫 弘益大學校 産業技術硏究所 2005 産業技術 Vol.15 No.-
The turning circle of a ship is the path followed by her center of gravity in making a turn of 360° degree or more with helm at constant angle. But generally it means her path traced at full angle of the rudder. For the ordinary ship the bow will be inside and the stern outside this circle. It has been usually understood that the turning circle is not essentially affected by ship's speed at Froude numbers less than about 0.3. However, it is recently reported that the speed provide considerable effects upon the turning circle on piloting many ships actually at sea. In this paper, the author analyzed what effects the speed could provide on the turning circle theoretically from the viewpoint of ship motions and examined how the alteration of the speed at Froude no. under 0.30 affect the turning circle actually, through experiments of actual ships of a small and large size.
Comparison of Ionic Liquid and Ion-Gel Top-Gate MoS₂ Field-Effect Transistors
Guen Hyung Oh,TaeWan Kim 한국진공학회(ASCT) 2021 Applied Science and Convergence Technology Vol.30 No.5
Polymer electrolytes and ionic liquids (ILs) have attracted significant interest in applications as gate dielectrics. In this study, we fabricated top-gated molybdenum disulfide (MoS₂) thin-film transistors using IL and ion-gel (IG) gate dielectrics. Room-temperature Raman spectra measurements indicated a dominant peak spectral emission at 358 cm<SUP>−1</SUP> (<SUP>1</SUP> 2) and 406.44 cm<SUP>−1</SUP> (1g) associated with bilayer MoS₂ films. The fabricated thin-film field-effect transistors (FET) with IG gate dielectric exhibited band transport with a highest mobility of 0.5 cm²/V⋅s, and a poor ON/OFF ratio of ~10. By contrast, the FET with IL gate dielectric exhibited a 3400 % improvement in terms of the mobility (17.9 cm²/V⋅s), and a 1000 % improvement of the ON/OFF ratio (~100).
Family History and Survival of Patients with Gastric Cancer: A Meta-Analysis
Oh, Myueng Guen,Kim, Jin Hwa,Han, Mi Ah,Park, Jong,Ryu, So Yeon,Choi, Seong Woo Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8
Background: Previous studies have generated conflicting evidence regarding associations between family history and survival after gastric cancer surgery. In this study, we investigated this question using a meta-analysis. Materials and Methods: To identify relevant studies, PubMed and Embase databases were searched up to June 2013. Two reviewers independently assessed search results and data extraction of included studies. Hazard ratios (HRs) and 95% confidence intervals (CIs) for overall survival (OS) were calculated based on fixed- or random-effects models. Homogeneity of effects across studies was assessed using $x^2$ test statistics and quantified by $I^2$. Results: A total of five studies were selected according to the inclusion criteria. The total number of patients included was 2,030, which ranged from 145 to 598 per study. There was no significant difference in OS by family history of cancer (HR=0.83, 95%CIs=0.50-1.38), but subgroup analysis of patients with a first-degree family history of cancer (HR=0.74, 95%CIs=0.60-0.93) and gastric cancer family history (HR=0.56, 95%CIs=0.41-0.76) tended to show better OS in these patients. Conclusions: This meta-analysis suggests that a first-degree family history of cancer or gastric cancer family history is associated with better survival of gastric cancer patients after surgery, after a systematic review of five previous studies. These results can be applied by clinicians when counselling patients regarding their risk of death from gastric cancer. Further study is needed to investigate the underlying mechanism between family history and survival in gastric cancer patients.
High-performance Te-doped p-type MoS₂ transistor with high-K insulators
Guen Hyung Oh,TaeWan Kim 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Herein, we demonstrate the n-type conductivity suppressing property of the tellurium (Te)-doped multilayer MoS<sub>2</sub>, grown by metal-organic chemical vapor deposition. The back-gated as-grown Te-doped multilayer MoS<sub>2</sub> field-effect transistor (FET) is observed to exhibit p-type behavior. Enhanced device performance has been achieved by doping the p-type MoS<sub>2</sub> transistors in high-K dielectric gate insulators with Te. pFET devices containing Al<sub>2</sub>O<sub>3</sub> dielectric insulators exhibit extremely high performance, including a maximum mobility of ~182 cm<sup>2</sup>/V·s, a low subthreshold swing of ~215 m V/dec.
Assessing Activity Limitation Among Cancer Survivors in Korea Using Data from a Nationwide Survey
Oh, Myueng Guen,Han, Mi Ah,Byeon, Yu Mi,Bae, Kyung Min,Choi, Seong-Hyung Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.7
Background: More than 1 million cancer survivors reside in Korea. We here investigated activity limitations of cancer survivors compared to controls without a history of cancer. Materials and Methods: Using the 4th and 5th Korea National Health and Nutrition Examination Survey (2007-2012) data, we identified 1,155 adult cancer survivors. Activity limitations were defined as limitation in activities of daily living, experience of lying in a sickbed, and number of days lying in a sickbed during the last month. Descriptive analysis and multiple logistic regression compared these measures for survivors and controls by sex and age groups. Results: Approximately 29.4% of cancer survivors reported limitation in activities of daily living, 14.6% experienced lying in a sickbed, and 4.3% experienced more than 15 days lying in a sickbed during the last month. After controlling for demographic and health-related factors, cancer survivors were more likely to report activity limitation than controls. The associations were similar across sex and age groups. Conclusions: Cancer survivors have increased activity limitation compared to controls and these limitations persist across sex and age. Targeted interventions and improved management are essential for improving cancer survivor daily life.
논문 : 우리나라기업의 윤리경영이 기업가치 및 재무적성과에 미치는 영향
오근혜 ( Guen Hye Oh ),윤평구 ( Pyeong Ku Yun ),강승모 ( Sung Mo Kang ) 명지대학교 금융지식연구소 2012 금융지식연구 Vol.10 No.3
본 연구는 우리나라기업의 윤리경영과 기업가치, 윤리경영과 재무적성과의 관계를 규명하기 위한 것이다. 이를 위하여 경제정의연구소의 최근 2개년(2010, 2011) 경제정의지수(KEJI Index) 와 한국기업지배구조원의 ESG평가 기업들을 대상으로 회귀분석과 T검정을 실시하였다. 분석결과 윤리경영은 기업가치 및 재무적성과에 모두 유의적인 정(+)의 상관관계를 나타내었다. 또한 이 변수들의 선·후 관계를 분석한 결과 기업가치는 윤리경영의 수행정도에 정(+)의 영향을 미치며(여유자금이론), 동시에 윤리경영수행정도가 해당기업의 재무적성과에 정(+)의 영향을 미치는 것으로 나타나(선의경영이론) 윤리경영이 기업가치와 재무적성과에 상호간 긍정적 영향을 주고받는 선순환관계인 것으로 확인되었다. The purpose of this study is to investigate relationship between ethical management and firm value and financial performances. Major findings by empirical study are summarized as follows. First, Ethical management is positive related to firm value. Market investors especially consider that environmental management is very important factor to evaluate firm value. Second, Ethical management is also positive related to financial performances. But this relation is less strong than that to firm value. Third, Referred to causes and effects between ethical management and firm value and financial performances, we found that ethical management and firm value are mutually positive affected each others. That are also between ethical management and financial performances.
오근(Guen Oh),황은하(Eun-Ha Hwang) 한국산업융합학회 2008 한국산업응용학회 학술대회 논문집 Vol.- No.-
A new finite element equation is derived by applying quadratic time integration scheme to the Gurtin's variational formulation for the analysis of the linear transient elastodynamic problems to increase the numerical accuracy. Numerical results are obtained by using the axial and axisymmetric and spherically symmetric one-dimensional bar element. and compared with the previous solutions by other researchers. Good agreements are obtained between numerical and theoretical solutions. which shows the validity and accuracy of the presented method.