http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
QoE-based transmission strategies for multi-user wireless information and power transfer
정태훈,권태훈,채찬병 한국통신학회 2015 ICT Express Vol.1 No.3
One solution to the problem of supplying energy to wireless networks is wireless power transfer. One such technology–electromagnetic radiation enabled wireless power transfer–will change traditional wireless networks. In this paper, we investigate a transmission strategy for multi-user wireless information and power transfer. We consider a multi-user multiple-input multiple-output (MIMO) channel that includes one base station (BS) and two user terminals (UT) consisting of one energy harvesting (EH) receiver and one information decoding (ID) receiver. Our system provides transmission strategies that can be executed and implemented in practical scenarios. The paper then analyzes the rate–energy (R–E) pair of our strategies and compares them to those of the theoretical optimal strategy. We furthermore propose a QoE-based mode selection algorithm by mapping the R–E pair to the utility functions.
Salmonella 및 Shigella의 各種 環境에서의 生存
丁泰勳,全燾基 慶北大學校 醫科大學 1979 慶北醫大誌 Vol.20 No.2
Salmonella typhi와 shigella의 食鹽加 phosphate buffer (pH7.2), 蒸溜水(pH6.2), 水道水 및 샘물에서의 生存 및 溫度가 이에 미치는 影響을 보았다. Buffer에서는 S. typhi는 20℃에서 60日까지 菌數에 큰 變動이 없이 生存하였으며 4℃에서는 時日의 經過과 따라 次次 減少되거나 60日後에도 많은 菌이 生存하였다. 그러나 -18℃에서는 生菌數가 急速히 減少되어 30日後에는 生菌을 檢出하지 못하였다. 蒸溜水에도 같은 傾向을 보였으나 다만 20℃에서는 buffer에서 보다 菌의 減少가 현저하였다. Shigella는 buffer 및 蒸溜水에서 다같이 20℃ 및 4℃에서 時日의 經過에 따라 次次 減少 하였으나 60日後에도 生菌을 檢出할 수 있었고 -18℃에서는 30日 後에는 生菌이 檢出되지 않았다. E. coli는 buffer에서 20℃에서는 時日의 經過에 따라 菌數가 增加하였고 4℃ 및 -18℃에서는 次次 減少되었으나 그 減少는 S. typhi 및 Shigella보다 緩慢하였다. S. typhi와 Shigella는 E. coli와의 共存下에서도 單獨存在時와 같은 生存曲線을 나타내는 것으로 생각되었다. 水道水와 샘물에서는 S. typhi와 shigella가 大體로 20日以內에서 滅菌되었다. 藥劑耐性菌과 感受性菌사이에 生存期間의 差異는 볼 수 없었다. The survival of Salmonella typhi and Shigella flexneri in various environments, such as phosphate buffered saline (pH 7.2), distilled water, city water, and well water, was studied at various tempereaturs. S. typhi survived in buffer at 20℃ without marked decrease in number of cells for more than 60 days. The number decreased gradually at 4℃, but a considerably large number of cells survived at 60 days. However, the cells were rapidly sterilized at -18℃ within 30 days. The survival of S. typhi in distilled water showed the similar patterns of in buffer, except 20℃ at which the decrease of viable cells was more rapid than in buffer. The number of Shigella in buffer and distilled water decreased gradually with almost the similar patterns between two media at 4℃ and 20℃, but viable cells were found even after 60 days. Shigella showed the similar pattern of survival with S. typhi at -18℃. The number of E. coli at 20℃ increased in buffer at the beginning of incubation and maintained the same level for more than 110 days, but decreased gradually at 4℃ and -18℃ at more slowly than S. typhi and Shigella. Mixed incubation of S. typhi or Shigella with E. coli did not influence the survival of these organisms alone in media. The survival of the organisms was not influenced by the resistance to drugs. S. typhi and Shigella were rapidly sterilized within 20 days in city water and well water.
정태훈,한대현,최영식 東義大學校産業技術開發硏究所 2003 産業技術硏究誌 Vol.17 No.-
본 논문에서는 IMT-2000 기지국(중계기)용 저잡음 증폭기에 적합한 저 전압, 저 전류 동작점을 설정하고 이와 동시에 낮은 잡음 특성과 높은 입력 인터셉트점을 가지는 증폭기를 설계하였다. 입력 부정합에 의한 높은 입력 IP_3를 얻기 위하여 50Ω에 가까운 최적의 잡음지수를 얻기 위한 반사계수 값이 아닌 0.3㏈ 이하의 일정 잡음지수원 상에서 보다 적절한 부정합을 얻을 수 있는 입력 반사계수를 설정하고 출력을 복소 정합회로로 설계하여 두 특성을 최대로 얻을 수 있게 하였다. 본 논문에서는 최근 통신소자로 각광받고 있는 HEMT소자를 사용하였으며 Agilent사의 pHEMT ATF-36077을 능동소자로 채택하고 Agilent사의 고주파 시뮬레이터인 ADS를 이용하여 회로 설계 및 모의실험, 회로 및 성능의 최적화를 수행 하였으며 모의실험 결과를 활용하여 유전율 ε_r=3.0, 두께 0.762㎜인 테프론(Teflon) 기판을 이용하여 제작하였다. 구현한 저잡음 증폭기는 정합 및 바이어스의 최적화를 수행하여 기지국(중계기)용으로 제작되었으며 V_(ds)=2[V], I_d=9[mA]의 동작특성과 낮은 잡음특성, 높은 입력 인터셉트점, 그리고 입/출력에서 양호한 정합 특성을 얻을 수 있었다.
정태훈 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
In this paper, Compression in the case where dissimilar blocks arc twinned variously are carried out in the condition of lubricated interface. The degree of growth is experimentally investigated. Moreover, numerical simulations are carried out by the elastic-plastic FEM for the case of the dissimilar blocks with the initial sawtooth angle of 60°. The dissimilar blocks are twinned, larger difference between material properties leads smaller growth, and the degreased interface leads smaller growth than that in the lubricated one. Furthermore, by the simulation of compression where dissimilar blocks are twinned, it is confirmed that the tendency of the general deformation pattern is very similar to the experiment.
Choosing Optimal STR Markers for Quality Assurance of Distributed Biomaterials in Biobanking
정태훈,이희정,이미희,전재필,김기상,한복기 한국유전체학회 2009 Genomics & informatics Vol.7 No.1
The quality assurance (QA) is of utmost importance in biobanks when archived biomaterials are distributed to biomedical researchers. For sample authentication and cross-contamination detection, the two fundamental elements of QA, STR genotyping is usually utilized. However, the incorporated number of STR markers is highly redundant for biobanking purposes, resulting in time and cost inefficiency. An index to measure the cross-contamination detection capability of an STR marker, the mixture probability (MP), was developed. MP as well as other forensic parameters for STR markers was validated using STR genotyping data on 2328 normal Koreans with the commercial AmpFlSTR kit. For Koreans, 7 STR marker (D2S1338, FGA, D18S51, D8S1179, D13S317, D21S11, vWA) set was sufficient to provide discrimination power of ∼10−10 and cross-contamination detection probability of ∼1. Interestingly, similar marker sets were obtained from African Americans, Caucasian Americans, and Hispanic Americans under the same level of discrimination power. Only a small subset of commonly used STR markers is sufficient for QA purposes in biobanks. A procedure for selecting optimal STR markers is outlined using STR genotyping results from normal Korean population.