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( Sung Jun Chung ),( Tae Yeob Kim ),( Sun Min Kim ),( Min Roh ),( Mi Yeon Yu ),( Jung Hoon Lee ),( Chang Kyo Oh ),( Eun Young Lee ),( Seung Lee ),( Yong Cheol Jeon ),( Kyo Sang Yoo ),( Joo Hyun Sohn ) 대한간학회 2014 Clinical and Molecular Hepatology(대한간학회지) Vol.20 No.2
Background/Aims: The incidence of symptomatic hepatitis A reportedly increased among 20- to 40-year-old Korean during the late 2000s. Vaccination against hepatitis A was commenced in the late 1990s and was extended to children aged <10 years. In the present study we analyzed the changes in the seroprevalence of IgG anti-hepatitis A virus (HAV) over the past 13 years. Methods: Overall, 4903 subjects who visited our hospital between January 2001 and December 2013 were studied. The seroprevalence of IgG anti-HAV was analyzed according to age and sex. In addition, the seroprevalence of IgG anti-HAV was compared among 12 age groups and among the following time periods: early 2000s (2001-2003), midto- late 2000s (2006-2008), and early 2010s (2011-2013). The chi-square test for trend was used for statistical analysis. Results: The seroprevalence of IgG anti-HAV did not differ significantly between the sexes. Furthermore, compared to the seroprevalence of IgG anti-HAV in the early 2000s and mid-to-late 2000s, that in the early 2010s was markedly increased among individuals aged 1-14 years and decreased among those aged 25-44 years (P<0.01). We also found that the seroprevalence of IgG anti-HAV in individuals aged 25-44 years in the early 2010s was lower than that in the early 2000s and mid-to-late 2000s. Conclusions: The number of symptomatic HAV infection cases in Korea is decreasing, but the seroprevalence of IgG anti-HAV is low in the active population. (Clin Mol Hepatol 2014;20:162-167)
High Efficiency Exciplex Emitters Using Donor–Acceptor Type Acceptor Material
Oh, Chan Seok,Kang, Yu Jin,Jeon, Sang Kyu,Lee, Jun Yeob American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.39
<P>A design rule of the acceptor material of exciplexes was studied by synthesizing two acceptor materials with only acceptor moieties and with both a donor and an acceptor simultaneously. Molecular calculation and photophysical measurements of the exciplexes revealed that the donor acceptor type acceptor materials promoted the exciplex formation by charge transfer character and increased the photoluminescence quantum yield of the exciplexes. The combination of a donor material and the donor acceptor type acceptor material achieved a high quantum efficiency of 12.6% in the green exciplex devices.</P>
Oh, Yoo Jin,Kim, Hye Young,Lee, Mi Hwa,Suh, Sung Hwan,Choi, Yongmun,Nam, Tae-gyu,Kwon, Woo Young,Lee, Sang Yeob,Yoo, Young Hyun American Society for Pharmacology and Experimental 2018 Molecular pharmacology Vol.94 No.6
<P>Nonalcoholic fatty liver disease (NAFLD) is an increasingly studied condition that can progress to end-stage liver disease. Although NAFLD was first described in 1980, a complete understanding of the mechanism and causes of this disease is still lacking. Six-transmembrane protein of prostate 2 (STAMP2) plays a role in integrating inflammatory and nutritional signals with metabolism. Our previous study suggested that STAMP2 may be a suitable target for treating NAFLD. In the current study, we performed a focused drug-screening and found that cilostazol could be a potential STAMP2 enhancer. Thus, we examined whether cilostazol alleviates NAFLD through STAMP2. The in vivo and in vitro pharmacological efficacies of cilostazol on STAMP2 expression and lipid accumulation were analyzed in NAFLD mice induced by high-fat diet (HFD) and in HepG2 cell lines treated by oleic acid (OA), respectively. Cilostazol increased the expression of STAMP2 through transcriptional regulation in vivo and in vitro. Cilostazol also dampened the STAMP2 downregulation caused by the HFD and by OA in vivo and in vitro, respectively. Cilostazol activated AMP-activated protein kinase (AMPK) in vivo and in vitro, and AMPK functions upstream of STAMP2, and reversed downregulation of STAMP2 expression through AMPK in the NAFLD model. Cilostazol ameliorates hepatic steatosis by enhancing hepatic STAMP2 expression through AMPK. Enhancing STAMP2 expression with cilostazol represents a potential therapeutic avenue for treatment of NAFLD.</P><P>[Figure]</P>
삼층박막 구조의 PHR 센서를 이용한 자기 박테리아 감지
유상엽(Sang Yeob Yoo),임병화(Byeong Hwa Lim),송인철(In Cheol Song),김철기(Cheol Gi Kim),오선종(Sun Jong Oh) 한국자기학회 2013 韓國磁氣學會誌 Vol.23 No.6
In this study, we have fabricated magnetoresistive sensors of 50 μm × 50 μm cross type by trilayer structure of antiferromagnetic/nonmagnetic/ferromagnetic. The magnetic signal and magnetic domain of this sensor is measured. The sensor hysteresis loop is not in symmetrical at 0 Oe. This is may be due to the exchange coupling between ferromagnetic layer and anti ferromagnetic layer. This exchange bias value is 20 Oe. The sensor signal is measured at between the applied magnetic field and current. The sensor signal is measured between the applied magnetic field and current at 20˚ and 90˚ angles. The sensitivity of sensor signals is 20 μV/Oe and 7 μV/Oe at 20˚ and 90˚ angles, respectively. In addition, this sensor is also applied for the detection of magnetic bacteria at 20˚ angle. From these results, we calculate the stray field of single bacteria is to be 5 × 10<SUP>?5</SUP>Oe.
융합이향운동이 개입된 양안단일시 및 복시상태가 낙상위험에 미치는 영향
김상엽(Sang-Yeob Kim),오광근(Kwang-Keun Oh),김형수(Hyeong-Su Kim),김동환(Dong Hoan Kim),문병연(Byeong-Yeon Moon),유동식(Dong-Sik Yu),조현국(Hyun Gug Cho) 한국안광학회 2017 한국안광학회지 Vol.22 No.4
Purpose: This study was performed to investigate the influence of visual conditions such as binocular single vision intervened fusional vergence and diplopia on the risk of falls in static posture. Methods: Forty-two subjects of average age 23.40±2.70 years were participated in this study. In order to induce binocular single vision with fusional convergence (FC) and fusional divergence (FD), BI·BO prism lenses of 4Δ and 8Δ were added, respectively, and to induce vertical vergence (VV), OD-BU 1Δ/OS-BD 1Δ was added in a trial frame fully corrected subject’s refractive error. We detected the minimum amount of prism that diplopia was occurred in each subject and applied for inducing diplopia in each direction of vergence. Using the TETRAX biofeedback system, the fall risk index (FI) was measured at each test condition and compared with that without prism effect. Also, the difference of FI depending on the amount of breakpoint in horizontal vergence was investigated. Results: FI was increased significantly when involved FC and VV for maintaining binocular single vision, but, FI decreased to the state without prism effect while diplopia is occurred. FI showed a higher tendency in the group with low BO break point. Conclusions: Even if binocular single vision was maintained, the visual state intervened FC and VV was analyzed as a factor that more increasing the risk of falling than the diplopia state.
Development of Sensing Circuit for Safety Device
Jong-Yeob Oh,Dae-Young Pyo,Sung-Hun Jo 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
Since electric kickboard rental services have recently activated in many areas of South Korea, electric kickboards have taken root as a new transportation. As the use of this transportation has increased, accidents, which occurred because many electric kickboard riders do not wear helmets, are also increasing. To ease these accidents, this paper suggests a system to prevent electric kickboard helmets from not being worn.
버전제어에서 컴포넌트의 형상형성 제어를 위한 객체지향 라이브러리
오상엽(Sang-Yeob Oh),최우승(Woo-Seung Choi) 한국컴퓨터정보학회 2008 韓國컴퓨터情報學會論文誌 Vol.13 No.6
버전 제어 시스템은 급속한 환경의 변화나 개발 환경이 복잡한 프로그래밍 환경에서 사용되고 있으며, 정의된 형상 규칙 정보를 정확하게 알지 못하는 경우나 미리 정의되지 않은 정보에 대해서는 형상 형성 정보 제공 문제가 발생한다. 본 논문에서는 사용자가 원하는 컴포넌트를 복합적으로 형상형성 제어 할 수 있는 라이브러리 시스템을 제안하고, 모델링하여 구현하였다. 제안한 형상형성 제어를 위해 사용되는 라이브러리는 확장 facet 분류를 응용하여 하부 표현 구조에 관계없이 라이브러리로부터 컴포넌트를 검색할 수 있도록 하였다. 이것은 본 논문에서 제안한 TreeSearch 클래스와 형상형성 제어 함수를 이용하여 관리된다. 본 논문의 라이브러리는 다른 언어와의 인터페이스를 통해 사용될 수 있으며, 사용자에 의해 facet이 확장되는 장점을 가진다. A version control system is used in a rapidly changed environment or a program which developed in a complicated environment. it is a problem of configuration thread in supporting information that we, in this method, can't know a exactly well-defined configuration rule information and a predefined information. In this paper. Library system is suggested, modelled, and implemented so as to configuration thread control the components required by the user in many ways. As for the library used in the configuration thread control suggested in this paper, the components can be retrieved from the library regardless of the infrastructure, applying the extended facet classification. This retrieval framework is managed using TreeSearch class and the configuration thread control function. The library system of this paper can be used by the interface with other languages, and this system is to have a advantage to extend a facet by user.