http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
WiMAX 시스템에서 유니캐스트 기반 그룹통신 서비스 성능 분석
엄윤성 ( Yun-sung Ehm ),김명균 ( Myung-kyun Kim ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.1
VoIP 패킷을 전송하는데 있어서 MAC Header는 패킷의 데이터 크기에 비해 많은 대역폭을 할당 받고 있기에 제한된 무선자원의 사용에 부담이 되고 있다. 이러한 문제를 해결하기 위해 패킷 압축기법이나 패킷번들링을 이용하여 부하를 줄이기 위한 연구가 진행되고 있으며, 효율적인 무선 자원 이용의 향상을 가져올 수 있다. 따라서 본 연구에서는 WiMAX 시스템에서 스케줄링 서비스에 따른 VoIP서비스에서의 성능 분석을 하였다.
엄윤성 ( Yun-sung Ehm ),김명균 ( Myung-kyun Kim ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.2
그룹통신에서의 작업자 간에 긴밀한 통신을 필요로 하는 경우에 기존의 무전기나 주파수 공용통신은 음성 품질이 매우 열악하여 통신 신뢰성이 매우 낮다. 이러한 문제를 해결하기 위해 그룹통신에서 VoIP를 활용하는 것이 요구된다. VoIP를 이용할 경우 20ms정도의 짧은 주기로 인하여 패킷마다의 헤더로 인한 오버헤드가 발생하는데 이를 해결하기 위해 그룹통신에서의 패킷번들링이 요구된다. 따라서 본 연구에서는 패킷번들링을 적용한 상태에서 VoIP를 이용한 그룹통신 성능분석을 하였다.
강석한,김찬,엄민숙,김진혁,김기순 한양대학교 의과대학 1997 한양의대 학술지 Vol.17 No.1
Peripheral nerve injuries have been known to result in a chronic neuropathic pain characterized by symptoms of spontaneous burning pain, hyperalgesia, and allodynia. Recently it has been reported that the flexor reflex was greatly enhanced immediately after peripheral nerve section in the experimental animals. The persent study was underaken to investigte acute effects of the peripheral nerve injury on the sensitization of dorsal hom cells. After the sciatic nerve section, neither significant change was observed in the wind-up of WDR cells, nor wind-up was produced in the WDR cell that had not shown wind-up before the afferent nerve section. The A-fiber responses of WDR cells were not altered after section of the sciatic nerve. However, the C-fiber responses and after-discharge of the dorsal horn cell to imput signals started to increase in 2 hours after the nerve section. In 70% of experimental animals, the nerve section-induced increments in the WDR cell activities were abolished after topical application of 2% lidocaine to the proximal end of cut sciatic nerve. After pretreatemnt of the experimental animals with a NMDA receptor blocker, MK-801, the C-fiber response and after-discharge of the dorsal horn cell well not changed by the sciatic nerve section. These findings suggest that peripheral injury induces the sensitization of dorsal horn cells of the spinal cord and that signals from the proximal stump is essential for maintenance of the sensitization, which was mediated by NMDA receptors.
Correlation of electrode position and clinical outcomes in globus pallidus stimulation for dystonia
Park, H. R.,Lee, J. M.,Ehm, G.,Yang, H. J.,Song, I. H.,Lim, Y. H.,Kim, M. R.,Kim, K. R.,Lee, W. W.,Kim, Y. E. Springer Science + Business Media 2017 Acta neurochirurgica Vol.159 No.7
<P>The actual electrode location was slightly more posterior to the theoretically planned target. Electrodes concentrated near the posteroventral GPi tended to yield favorable outcomes.</P>
Characterization of ADME gene variation in 21 populations by exome sequencing
Hovelson, Daniel H.,Xue, Zhengyu,Zawistowski, Matthew,Ehm, Margaret G.,Harris, Elizabeth C.,Stocker, Sophie L.,Gross, Annette S.,Jang, In-Jin,Ieiri, Ichiro,Lee, Jong-Eun,Cardon, Lon R.,Chissoe, Stepha Lippincott WilliamsWilkins 2017 PHARMACOGENETICS AND GENOMICS Vol.27 No.3
<▼1><P>Supplemental Digital Content is available in the text.</P></▼1><▼2><P><B>Objective</B></P><P>Proteins involving absorption, distribution, metabolism, and excretion (ADME) play a critical role in drug pharmacokinetics. The type and frequency of genetic variation in the ADME genes differ among populations. The aim of this study was to systematically investigate common and rare ADME coding variation in diverse ethnic populations by exome sequencing.</P><P><B>Materials and methods</B></P><P>Data derived from commercial exome capture arrays and next-generation sequencing were used to characterize coding variation in 298 ADME genes in 251 Northeast Asians and 1181 individuals from the 1000 Genomes Project.</P><P><B>Results</B></P><P>Approximately 75% of the ADME coding sequence was captured at high quality across the joint samples harboring more than 8000 variants, with 49% of individuals carrying at least one ‘knockout’ allele. ADME genes carried 50% more nonsynonymous variation than non-ADME genes (<I>P</I>=8.2×10<SUP>–13</SUP>) and showed significantly greater levels of population differentiation (<I>P</I>=7.6×10<SUP>–11</SUP>). Out of the 2135 variants identified that were predicted to be deleterious, 633 were not on commercially available ADME or general-purpose genotyping arrays. Forty deleterious variants within important ADME genes, with frequencies of at least 2% in at least one population, were identified as candidates for future pharmacogenetic studies.</P><P><B>Conclusion</B></P><P>Exome sequencing was effective in accurately genotyping most ADME variants important for pharmacogenetic research, in addition to identifying rare or potentially de novo coding variants that may be clinically meaningful. Furthermore, as a class, ADME genes are more variable and less sensitive to purifying selection than non-ADME genes.</P></▼2>