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반측안면경련 환자에서의 자기공명영상 및 자기공명혈관조영술
원종윤,김동익,김희진,서정호,전평,김희수,유영훈,나재범,정상섭,장진우,Won, Jong-Yoon,Kim, Dong-Ik,Kim, Hee-Jin,Suh, Jung-Ho,Jun, Pyung,Kim, Hee-Soo,You, Young-Hoon,Na, Jae-Bum,Chung, Sang-Sup,Chang, Jin-Woo 대한영상의학회 1995 대한영상의학회지 Vol.33 No.5
Purpose : To determine the usefulness of MR imaging and MR angiography (MRA) in the evaluation of patientswith hemifacial spasm. Material and Methods : One hundred and twenty-five patients with hemifacial spasm wereincluded in this study. Axial T1-, T2-weighted images, proton density image (3mm thickness, 256x192) and 3-D TOFMRA were performed. Relation between facial nerve and adjacent arterial structures was carefully evaluated, whichwas correlated with surgical findings. Results : MRA identified the presence of offending vessels at the root exitzone of facial nerve and its origin in 117 patients(52 PICA, 50 AICA, 6 vertebral artery, 9 dual vessels). Therewere 4 false negatives and 4 false positives. Vascular groove at the root exit zone was identified in 52 cases,but there was no positive correlation between severity and duration of symptoms. The presence of ipsilateral orcontralateral distal loop formation of vertebral artery were noted in 63 patients. In addition, 4 cases ofneoplastic and vascular lesions were also demonstrated on MR imaging. Conclusion : Combination of MR imaging andMRA is an useful screening modality in the presurgical evaluation of hemifacial spasm, which can demonstrate theoffending vessels as well as other pathologic lesions.
나경일,원종일,고진근,김상기,김종대,양일석,이진호 한국전자통신연구원 2013 ETRI Journal Vol.35 No.3
In this paper, we propose a triple-gate trench power MOSFET (TGRMOS) that is made through a modified RESURF stepped oxide (RSO) process, that is, the nitride_RSO process. The electrical characteristics of TGRMOSs, such as the blocking voltage (BVDS) and onstate current (ID,MAX), are strongly dependent on the gate configuration and its bias condition. In the nitride_RSO process, the thick single insulation layer (SiO2) of a conventional RSO power MOSFET is changed to a multilayered insulator (SiO2/SiNx/TEOS). The inserted SiNx layer can create the selective etching of the TEOS layer between the gate oxide and poly-Si layers. After additional oxidation and the poly-Si filling processes, the gates are automatically separated into three parts. Moreover, to confirm the variation in the electrical properties of TGRMOSs, such as BVDS and ID,MAX, simulation studies are performed on the function of the gate configurations and their bias conditions. BVDS and ID,MAX are controlled from 87 V to 152 V and from 0.14 mA to 0.24 mA at a 15-V gate voltage. This ID,MAX variation indicates the specific on-resistance modulation.
원종철,배자성,이홍재,이재동,나백주,최희주 대한의료정보학회 2004 Healthcare Informatics Research Vol.10 No.1
The PHIS(Public Health Information System) has been developed, and installed in public health centers nationwide since 1994. Ironically, however, even though infrastructures have been modernized, there is scant published material that has investigated the determinants of success of the PHIS. Therefore, these were evaluated in relation to the concern of user satisfaction, which was composed of overall satisfaction, usability, convenience and satisfaction for the supportive system. These satisfaction factors were also compared according to general user characteristics. The questionnaire response rate was 81.5%. The overall satisfaction and total Likert's scores, 3.078±0.634 and 3.005±0.563, respectively, showed that the end-users were relatively satisfied with the PHIS. Also, the overall satisfaction correlated most strongly with the convenience attribute. However, dissatisfaction strongly correlated with the supportive system, i.e. education and training facilities. This article describes our progress, and reports on the lessons learned, which will guide future work in this field.
안정동위원소 조성을 이용한 TCE 오염원 규명방법 소개
박영윤,이진용,나원종,김락현,최필성,전성천,Park, Youngyun,Lee, Jin-Yong,Na, Won Jong,Kim, Rak-Hyeon,Choi, Pil Sung,Jun, Seong-Chun 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.3
This study was performed to summarize application of ${\delta}^{13}C$, ${\delta}^{37}Cl$ and ${\delta}D$ of trichloroethylene (TCE) to studies on environmental forensic field regarding identification of TCE sources and evaluation of contribution of TCE to groundwater using data collected from literatures. ${\delta}^{13}C$, ${\delta}^{37}Cl$ and ${\delta}D$ of TCE give some information regarding sources of TCE because they show specific value according to manufacturing method. Also, TCE do not show a significant isotopic fractionation owing to adsorption and dilution. The isotopic fractionation mainly occurs by biodegradation. In addition, isotopic fractionation factor for TCE is different according to a kind of microorganism participated in biodegradation. However, the isotopic data of TCE have to be applied with chemical compositions of TCE and other hydrogeologic factors because isotopic fractionation of TCE is influenced by various factors.
Fabrication of Superjunction Trench Gate Power MOSFETs Using BSG-Doped Deep Trench of p-Pillar
김상기,박훈수,나경일,유성욱,원종일,구진근,채상훈,박형무,양일석,이진호 한국전자통신연구원 2013 ETRI Journal Vol.35 No.4
In this paper, we propose a superjunction trench gate MOSFET (SJ TGMOSFET) fabricated through a simple p-pillar forming process using deep trench and boron silicate glass doping process technology to reduce the process complexity. Throughout the various boron doping experiments, as well as the process simulations, we optimize the process conditions related with the p-pillar depth, lateral boron doping concentration, and diffusion temperature. Compared with a conventional TGMOSFET, the potential of the SJ TGMOSFET is more uniformly distributed and widely spread in the bulk region of the n-drift layer due to the trenched p-pillar. The measured breakdown voltage of the SJ TGMOSFET is at least 28% more than that of a conventional device.
CoCrFeMnNi 고엔트로피합금 주조재의 미세조직 및 기계적 특성
강민주 ( Minju Kang ),원종우 ( Jong Woo Won ),임가람 ( Ka Ram Lim ),박상협 ( Sang Hyeop Park ),서성문 ( Seong Moon Seo ),나영상 ( Young Sang Na ) 대한금속ㆍ재료학회 2017 대한금속·재료학회지 Vol.55 No.10
In this study, we made large-scale ingots of CoCrFeMnNi high entropy alloy by vacuum induction melting. The as-cast CoCrFeMnNi high entropy alloy contained a high proportion of columnar structures with a few equiaxed grains, and showed single phase fcc solid solutions without macro segregation and low interstitial levels. The tensile properties along the three different loading directions were investigated at low-temperature and room temperature. A decrease in temperature led to an increase in yield and tensile strengths. The increase in anisotropy due to the columnar structure was negligible. Unlike wrought CoCrFeMnNi high entropy alloys, twins were actively formed in the specimen deformed at room temperature. Mechanical twinning was found to be a result of the coarse grain size, over 500 μm, of the as-cast CoCrFeMnNi high entropy alloy, which effectively reduced the critical stress for twinning. Charpy impact tests were also conducted, and the absorbed energy of the CoCrFeMnNi high entropy alloy showed no dependence on the temperature or loading directions. The results of this study provide an understanding of pilot-scale high entropy alloy castings, and are expected to be utilized as basic properties for manufacturing large-scale high entropy alloy castings, which are effective in severe environments. (Received May 23, 2017; Accepted June 4, 2017)