http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Na, Won Kyun,Lim, Hyung Mi,Huh, Soo Hyun,Park, Sang Eon,Lee, Youn-Seoung,Lee, Seung Ho Elsevier 2009 Materials science and engineering B. Advanced Func Vol.163 No.2
<P><B>Abstract</B></P><P>Colloidal silica was prepared using a direct oxidation process of silicon powders with different purities, average particle sizes, and surface oxidation layer thicknesses in a water solvent with the base catalysts. Purities of 97.00–99.96% and average particle sizes of 200 and 500 mesh of silicon starting materials were evaluated. The materials were thermally oxidized for 3, 16, and 30h to observe the effect of the surface oxidation layer on the formation of colloidal silica. The longer the thermal oxidation time, the higher the oxide layer thickness on the silicon, and the larger the average size of silica particle observed in the product of colloidal silica when silicon particles had the oxide layer up to approximately 50nm. When the oxide film was higher than 50nm, the silica particle size did not increase with an increase in the oxide layer of silicon. The dependence of the average particle silica size on the oxide layer thickness of silicon was observed to be smaller in the colloidal silica from the 200 mesh size of silicon than from the 500 mesh size. The average particle size of silicon was found to affect the average particle size of silica in the direct oxidation, however the correlation between the purity of silicon and the average particle size of silica was not determined as it fell outside the range of this experiment.</P>
( Yeun Seoung Choi ),( Jung Soo Lim ),( Woocheol Kwon ),( Soon Hee Jung ),( Il Hwan Park ),( Myoung Kyu Lee ),( Won Yeon Lee ),( Suk Joong Yong ),( Seok Jeong Lee ),( Ye Ryung Jung ),( Jiwon Choi ),( 대한결핵 및 호흡기학회 2015 Tuberculosis and Respiratory Diseases Vol.78 No.4
Pulmonary Langerhans cell histiocytosis is an uncommon diffuse cystic lung disease in adults. In rare cases, it can involve extrapulmonary organs and lead to endocrine abnormalities such as central diabetes insipidus. A 42-year-old man presented with polyphagia and polydipsia, as well as a dry cough and dyspnea on exertion. Magnetic resonance imaging of the hypothalamic-pituitary system failed to show the posterior pituitary, which is a typical finding in patients with central diabetes insipidus. This condition was confirmed by a water deprivation test, and the patient was also found to have type 2 diabetes mellitus. Computed tomographic scanning of the lungs revealed multiple, irregularly shaped cystic lesions and small nodules bilaterally, with sparing of the costophrenic angles. Lung biopsy through video-assisted thoracoscopic surgery revealed pulmonary Langerhans cell histiocytosis. On a follow-up visit, only 1 year after the patient had quit smoking, clinical and radiological improvement was significant. Here, we report an uncommon case of pulmonary Langerhans cell histiocytosis that simultaneously presented with diabetes insipidus and diabetes mellitus.
기동부하가 반영된 직류철도 시스템에서 보호계전기의 동작
이원석(Won-Seok Lee),강상희(Shang-Hee Kang),박종민(Jong-Min Park),정호성(Ho-Seoung Jeong) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
DC traction power system is operated ungrounded so that minimize the stray current. Because the stray current is still present, a rail potential is increased. The ground faults in the DC railway systems are usually detected by a potential relay(64P). And the fault current can be smaller than the current of load starting. 50 it's important to discriminate between the small fault current and the load starting current. The DC fault selective relay (50F) detects a remote short circuit fault. This paper analyzed behaviors of the potential relay (64P) and the DC fault selective relay (50F) using the load starting model in PSCAD/EMTDC.
카메라트래핑을 활용한 광교신도시 내 도시형 생태통로 모니터링
박일수 ( Park Il-su ),김휘문 ( Kim Whee-moon ),김성열 ( Kim Seoung-yeal ),박찬 ( Park Chan ),송원경 ( Song Won-kyong ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2021 한국환경복원기술학회지 Vol.24 No.1
The new town in Korea, developed as a large-scale housing plan, has created urban ecological corridors to provide habitat and movement routes to wildlife and to promote natural ecological flow. This study aimed to investigate the use of wildlife in 10 ecological corridors in Gwanggyo New Town through camera trap technology and confirm effectiveness by identifying environmental factors affecting the use of wildlife's urban ecological corridors. Our researchers installed 20 unmanned sensor cameras at each the entrance and exit of the ecological corridors, and monitored urban wildlife for 10 weeks. According to the monioring results, the main species in Gwanggyo New Town were identified not only raccons, cats, water deer, korean hare and avain but also magpies, dove, eurasian tree sparrow, ring-necked pheasant, and eurasian jay. The number of uses ecological corridors of urban residents was 801(13.49%), as high as that of urban wildlife (1,140, 19.20%), which was judged to have disturbed the use of ecological corridors by wildlife. However, most dominant species of urban wildlife are nocturnal so that, it was judged that they share home range with urban residents at a time interval. In addition, according to the correlation analysis results between the mammal using rate of the urban ecological corridors and environmental factors(ecological corridor-specific length, ecological corridor- specific width, cover degree, shielding degree, connected green area, separation of movement routes, and presence of streetlights), environmental factors were not statistically significant. However, the more the area of green space connected to ecological corridors, the more increasing the mammal using rate of ecological corridor(r=0.71, p<0.05). Therefore, the area of green space connected to the ecological corridors that is associated with rate of wildlife using corridors should be considered as a priority when developing an urban ecological corridors. In the future, this study will extend the observation period of the ecological corridors and continuously accumulate data by adding the number of observation cameras. Furthermore, it is expected that the results of this study can be used as basic data for the standards for urban ecological corridors installation.
Lee, Seoung Rak,Kü,fner, Michelle,Park, Minji,Jung, Won Hee,Choi, Sang Un,Beemelmanns, Christine,Kim, Ki Hyun The Royal Society of Chemistry 2019 ORGANIC CHEMISTRY FRONTIERS Vol.6 No.2
<P>We report the isolation of two novel epimeric phomaligadione-derived polyketides, beauvetetraones A-B (1-2), from the entomopathogenic fungus <I>Beauveria bassiana</I>. Beauvetetraones A and B feature an unprecedented methylene-bridged phloroglucinol skeleton with a highly rearranged scaffold. In addition, a dimer of two phomaligadiones, named beauvetetraone C, was isolated for the first time from a natural source. The structures of compounds 1-3 including their absolute configurations were unambiguously assigned by NMR spectroscopic analyses, phenylglycine methyl ester (PGME) analysis, and quantum chemical ECD calculations. A putative biosynthetic pathway for beauvetetraones A-C is proposed.</P>
Discussion of Preliminary Design Review for MIRIS, the Main Payload of STSAT-3
Han, Won-Yong,Jin, Ho,Park, Jang-Hyun,Nam, Uk-Won,Yuk, In-Soo,Lee, Sung-Ho,Park, Young-Sik,Park, Sung-Jun,Lee, Dae-Hee,Ree, Chang-H.,Jeong, Woong-Seob,Moon, Bong-Kon,Cha, Sang-Mok,Cho, Seoung-Hyun,Rhe 한국우주과학회 2008 한국우주과학회보 Vol.17 No.2
Kim, Seoung Geun,Hwang, Yoon Ha,Shin, Yung Hae,Kim, Sung Won,Jung, Woo Sik,Kim, Sung Mi,Oh, Jae Min,Lee, Na Young,Kim, Mun Ju,Cho, Kyung Soon,Park, Yeon Gyeong,Min, Sang Kee,Lee, Chang Kyu,Kim, Jun Su The Korean Pediatric Society 2013 Clinical and Experimental Pediatrics (CEP) Vol.56 No.4
Purpose: There was a global increase in the prevalence of oseltamivir-resistant influenza viruses during the 2007-2008 influenza season. This study was conducted to investigate the occurrence and characteristics of oseltamivir-resistant influenza viruses during the 2007-2008 and 2008-2009 influenza seasons among patients who were treated with oseltamivir (group A) and those that did not receive oseltamivir (group B). Methods: A prospective study was conducted on 321 pediatric patients who were hospitalized because of influenza during the 2007-2008 and 2008-2009 influenza seasons. Drug resistance tests were conducted on influenza viruses isolated from 91 patients. Results: There was no significant difference between the clinical characteristics of groups A and B during both seasons. Influenza A/H1N1, isolated from both groups A and B during the 2007-2008 and 2008-2009 periods, was not resistant to zanamivir. However, phenotypic analysis of the virus revealed a high oseltamivir $IC_{50}$ range and that H275Y substitution of the neuraminidase (NA) gene and partial variation of the hemagglutinin (HA) gene did not affect its antigenicity to the HA vaccine even though group A had a shorter hospitalization duration and fewer lower respiratory tract complications than group B. In addition, there was no significant difference in the clinical manifestations between oseltamivir-susceptible and oseltamivir-resistant strains of influenza A/H1N1. Conclusion: Establishment of guidelines to efficiently treat influenza with oseltamivir, a commonly used drug for treating influenza in Korean pediatric patients, and a treatment strategy with a new therapeutic agent is required.