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홍순정,문양세,김혜숙,김진호,정영준 강원대학교 정보통신연구소 2007 정보통신논문지 Vol.11 No.-
In the mobile Internet environment, we need to perform frequent accesses between a mobile device and a content server for searching or downloading learning materials. In this paper, we propose an efficient prefetching technique to reduce the network cost and to improve the communication efficiency in the mobile dictionary. Contributions of the paper can be summarized as follows. First, we propose an overall framework for the prefetching-based mobile dictionary. Second, we present a method of determining the amount of prefetching data for each of packet-based and flat-rate billing cases. Third, by focusing on the English-Korean mobile dictionary for middle or high school students, we propose a method of determining the words to be prefetched in advance. Fourth, based on these determination methods, we propose an efficient prefetching algorithm. Fifth, through experiments, we show superiority of our prefetching-based method. Experimental results show that, compared with the traditional on-demand method, our prefetching-based method improves the average performance by 9.8%~19.7% for the packet-based billing and by 19.0%~33.2% for the flat-rate billing. These results indicate that our framework can be widely used not only in the mobile dictionary but also in other mobile Internet applications that require the prefetching technique.
( Jung Ho Kim ),( Yong Duk Jeon ),( Hea Won Ann ),( Heun Choi ),( Min Hyung Kim ),( Je Eun Song ),( Jin Young Ahn ),( Sun Bean Kim ),( Su Jin Jeong ),( Nam Su Ku ),( Sang Hoon Han ),( Jun Yong Choi ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Spontaneous bacterial peritonitis (SBP) in cirrhotic patients is known to be mostly caused by Gram-negative bacteria. Although SBP due to Gram-positive bacteria is increasing, less is known about the predictive factors of the infection. Methods: We performed a retrospective, observational cohort study consisting of patients, aged 18 years or older, with SBP due to Gram-positive and Gram-negative bacteria from Jan 2006 to Dec 2013 at Severance hospital, Seoul, Korea. Only the first episode for each patient was included in the analysis. Results: We identified 77 patients with SBP. 27 (35%) patients had Gram-positive infection and 50 (65%) patients had Gram-negative infection. Univariate analysis revealed that low SOFA score (P = 0.001), having catheters or prosthetic devices (OR, 12; 95% CI, 2.36~60.95; P = 0.001) and previous use of antibiotics within 30 days (OR, 3.07; 95% CI, 1.15~8.2; P = 0.023) were associated with Gram-positive infection. Multivariate analysis showed that having catheters or prosthetic devices was a remarkable predictor of Gram-positive bacterial infection (OR, 5.72; 95% CI, 1.01~32.33; P = 0.048). And, previous use of antibiotics within 30 days was also a remained independent predictive factor of Gram-positive infection (OR, 4.04; 95% CI, 1.16~14.13; P = 0.029). Gram-negative infection had higher SOFA score than Gram-positive (4.93 vs 6.68; P = 0.001), but there was no statistically significant difference in 28-day mortality between two groups (37% vs 48%; P = 0.407). Conclusions: In the current study, indwelling catheters or prosthetic devices, prior antimicrobial therapy within 30 days and a lower SOFA score were significantly associated with SBP caused by Gram-positive bacteria in patients with cirrhosis.
Jung Hyun Kang,Yong Kim,Hea Jeong Cheong,Hong Jun Bark,Jae Yel Yi,Kyu Man Cha,Tae Hun Chung,Young Dae KIm 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The electroluminescence (EL) properties of metal-oxide-semiconductor (MOS) devices employing nanocrystal Si/SiO2 superlattices are investigated. The amorphous silicon-rich oxide/SiO2 superlattices are grown by using rapid thermal chemical vapor deposition. During high-temperature annealing at 1100 C, Si nanocrystals are precipitated. Despite the simple MOS structure, the device shows conventional diode behavior in the current-voltage characteristics. We observe EL only under the forward bias condition, and the turn-on voltage is as low as 8 V. The EL intensity increases with increasing bias and is saturated over 11 V. We observe a systematic blueshift of the EL with increasing applied bias. Therefore, the observed EL is attributed to radiative recombination of carriers confined in the Si nanocrystals.
Jun Ah Lee,Hea Lin Oh,Dong Ho Kim,Jung Sub Lim 대한소아청소년과학회 2019 Clinical and Experimental Pediatrics (CEP) Vol.62 No.2
Purpose: We aimed to determine the prognostic significance of lymphocyte counts and the lymphocyte-monocyte ratio (LMR) in pediatric patients with osteosarcoma. Methods: We retrospectively reviewed the medical records of 27 pediatric patients with localized extremity osteosarcoma, treated at the Korea Cancer Center Hospital between May 2002 and March 2016. Leukocyte counts and LMR before treatment and on day 14 (LMR14) of the first cisplatin-doxorubicin chemotherapy round were evaluated. Patients were dichotomized according to the median value of these parameters, and survival rates were compared. Results: The median age of the 27 patients was 9.9 years (range, 3.2–14.1 years) and tumor sites were: distal femur (n=14), proximal humerus (n=7), proximal tibia (n=2), proximal fibula (n=2), and elsewhere (n=2). Patients were followed up on for a median of 76.4 months (range, 4.5–174.7 months), and 5-year overall (OS) and event-free survival (EFS) rates were 66.0%±9.8% and 60.9%±9.7%, respectively. Patients with a higher pretreatment lymphocyte count (≥2,320/μL) had better OS (90.9% vs. 46.2%, P=0.04) and EFS (83.9% vs. 38.5%, P=0.02). However, the day 14 lymphocyte count was not associated with survival. While no survival difference was observed between patients grouped according to pretreatment LMR (median value, 6.3), patients with a higher LMR14 (≥5) fared better than those with lower LMR14 (5-year OS: 83.3% vs. 46.3%, P=0.04). Conclusion: Pretreatment lymphocyte count and LMR during chemotherapy had prognostic significance in pediatric osteosarcoma patients. Further studies involving larger cohorts are necessary to validate our findings.
Multiple twinning drives nanoscale hyper-branching of titanium dioxide nanocrystals
Jun, Young-wook,Chung, Hea-Won,Jang, Jung-tak,Cheon, Jinwoo Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.28
<P>A novel twinning-driven hyper-branching mechanism of 1-dimensional nanowires is demonstrated to provide a clear understanding of the growth behaviour of a complex nanocrystal structure. Specifically, we have discovered that the multiple twinning mechanism can be successfully applied to the hyper-branching of nanowires. Systematic variations of TiO<SUB>2</SUB> hyper-branching in terms of branching multiplicity, branching angle, and size were observed, depending on the sequence, the degree, and the combination of two different twinning modes of contact and interpenetration. The twinning process is a reliable synthetic protocol for next generation nanostructures which require highly complex, but predictable shape and symmetry.</P> <P>Graphic Abstract</P><P>We have discovered that the multiple twinning mechanism can be successfully applied to the hyper-branching of TiO<SUB>2</SUB> nanowires. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm11405k'> </P>