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DISCOVERY OF A STRONG LENSING GALAXY EMBEDDED IN A CLUSTER AT z = 1.62
WONG, KENNETH C.,TRAN, KIM-VY H.,SUYU, SHERRY H.,MOMCHEVA, IVELINA G.,BRAMMER, GABRIEL B.,BRODWIN, MARK,GONZALEZ, ANTHONY H.,HALKOLA, ALEKSI,KACPRZAK, GLENN G.,KOEKEMOER, ANTON M.,PAPOVICH, CASEY J.,R The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We identify a strong lensing galaxy in the cluster IRC 0218 that is spectroscopically confirmed to be at z = 1.62, making it the highest-redshift strong lens galaxy known. The lens is one of the two brightest cluster galaxies and lenses a background source galaxy into an arc and a counterimage. With Hubble Space Telescope (HST) grism and Keck/LRIS spectroscopy, we measure the source redshift to be $z_S=2.26$. Using HST imaging, we model the lens mass distribution with an elliptical power-law profile and account for the effects of the cluster halo and nearby galaxies. The Einstein radius is $^{\theta}E=0.38^{+0.02{\prime}{\prime}}_{-0.01}$ ($3.2^{+0.2}_{-0.1}kpc$) and the total enclosed mass is $M_{tot}(<^{\theta}_E)=1.8^{+0.2}_{-0.1}{\times}10^{11}M_{\odot}$. We estimate that the cluster environment contributes ~ 10% of this total mass. Assuming a Chabrier IMF, the dark matter fraction within $^{\theta}E$ is $f^{Chab}_{DM}=0.3^{+0.1}_{-0.3}$, while a Salpeter IMF is marginally inconsistent with the enclosed mass ($f^{Salp}_{DM}=-0.3^{+0.2}_{-0.5}$).
Sensing Nitrate and Potassium Ions in Soil Extracts Using Ion-Selective Electrodes
Kim, H.J.,Sudduth Kenneth A.,Hummel John W. Korean Society for Agricultural Machinery 2006 바이오시스템공학 Vol.31 No.6
Automated sensing of soil macronutrients would allow more efficient mapping of soil nutrient spatial variability for variable-rate nutrient management. The capabilities of ion-selective electrodes for sensing macronutrients in soil extracts can be affected by the presence of other ions in the soil itself as well as by high concentrations of ions in soil extractants. Adoption of automated, on-the-go sensing of soil nutrients would be enhanced if a single extracting solution could be used for the concurrent extraction of multiple soil macronutrients. This paper reports on the ability of the Kelowna extractant to extract macronutrients (N, P, and K) from US Corn Belt soils and whether previously developed PVC-based nitrate and potassium ion-selective electrodes could determine the nitrate and potassium concentrations in soil extracts obtained using the Kelowna extractant. The extraction efficiencies of nitrate-N and phosphorus obtained with the Kelowna solution for seven US Corn Belt soils were comparable to those obtained with IM KCI and Mehlich III solutions when measured with automated ion and ICP analyzers, respectively. However, the potassium levels extracted with the Kelowna extractant were, on average, 42% less than those obtained with the Mehlich III solution. Nevertheless, it was expected that Kelowna could extract proportional amounts of potassium ion due to a strong linear relationship ($r^2$ = 0.96). Use of the PVC-based nitrate and potassium ion-selective electrodes proved to be feasible in measuring nitrate-N and potassium ions in Kelowna - soil extracts with almost 1 : 1 relationships and high coefficients of determination ($r^2$ > 0.9) between the levels of nitrate-N and potassium obtained with the ion-selective electrodes and standard analytical instruments.
In vivo wide-area cellular imaging by side-view endomicroscopy
Kim, Pilhan,Chung, Euiheon,Yamashita, Hiroshi,Hung, Kenneth E,Mizoguchi, Atsushi,Kucherlapati, Raju,Fukumura, Dai,Jain, Rakesh K,Yun, Seok H Nature Publishing Group 2010 NATURE METHODS Vol.7 No.4
In vivo imaging of small animals offers several possibilities for studying normal and disease biology, but visualizing organs with single-cell resolution is challenging. We describe rotational side-view confocal endomicroscopy, which enables cellular imaging of gastrointestinal and respiratory tracts in mice and may be extensible to imaging organ parenchyma such as cerebral cortex. We monitored cell infiltration, vascular changes and tumor progression during inflammation and tumorigenesis in colon over several months.
Building a successful fertility preservation program at a major cancer center
Jayeon Kim,Kenneth H Kim,Jennifer E Mersereau 대한부인종양학회 2014 Journal of Gynecologic Oncology Vol.25 No.2
Over 150,000 reproductive age individuals face fertility-threatening cancer treatments each year. Improved detection and treatment of cancer in reproductive-age patients have greatly increased the long-term survival and made it possible for these individuals to consider their long-term quality-of-life after cancer including having biologic offspring. Various methods of fertility preservation (FP) are now available for both males and females. In order to maximize FP options available to patients facing imminent gonadotoxic therapies, it is crucial that women have quick access to FP care and that providers expedite FP strategies. The overarching goal of a clinical FP program is to help patients and their physicians consider the impact of treatment on future fertility and facilitate FP efforts in what is often a limited time period before cancer treatment begins.
김남수(N. S. Kim),한국남(K. N. Han),Kenneth H. Church 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
나노크기의 입자를 수용액속에 분산시킨 나노잉크와 이를 이용한 직접인쇄방식 (Direct Write Technology)은 시간과 비용을 절약할 수 있고, 그 응용의 다양성과 소량다품종을 생산할 수 있는 장점으로 21세기에 들어서 주목받고 있는 기술이다. 직접인쇄방식은 RFID-Tag, Flexible-Electronics, OLED display, e-paper, 안테나, Flip-Chip용 범퍼(bumper), 언더필링(underfiling), Frit, 소형저항 및 생화학, 인공치아 등 그 응용부분이 광대하다. 이러한 다양한 응용분야로의 적용 가능성에도 불구하고, 직접인쇄방식은 재현성, 나노잉크의 점도, 입자크기, 재료 종류, 기판과의 접합성, 잉크 전기전도도, 화학적 안정성, 패터닝된 선의 분해능과 같은 물리화학적 특성과 적용 분야의 복잡성으로 인해 산업계에서 아직 활발하게 적용되어 지지 않고 있다. 본 연구에서는 직접인쇄방식 중 잉크 및 재료의 적용성에서 가장 호환성이 우수한 nScrypt사의 icro-Dispensing Direct Write(MDDW)기술의 한계와 가능성에 대해 조사하였다. MDDW기술은 나노잉크의 점도가 1~백만 cps까지 넓은 영역에서 사용 가능하여 여러 종류의 물질을 3차원 형상화 할 수 있으며, 직접 접촉식 방식으로 곡면 및 기판의 종류에 크게 영향을 받지 않는다. 그러나 다른 인쇄방식과 비교하여 미세한 선폭 10마이크론(um) 이하의 정확도로 패터닝하는 분야로는 적용에는 어려움이 있다. 또한 모든 직접인쇄방식이 갖고 있는 다양한 잉크와의 호환성은 개선되었으나, 잉크자체의 전기전도도 및 재현성에 문제가 있다. 본 논문에서는 현재의 MDDW로 가능한 시장분야와 새로운 나노잉크의 개발로 가능한 분야와 MDDW와 비교하여 기술적으로 상용화에 근접한 에어로-졸(Aerosol) 분사방식인 Maskless Mesoscale Materials Deposition(M3D)의 기술개발한계를 비교ㆍ검토하였다.
Rhee, Je-Keun,Kim, Kwangsoo,Chae, Heejoon,Evans, Jared,Yan, Pearlly,Zhang, Byoung-Tak,Gray, Joe,Spellman, Paul,Huang, Tim H.-M.,Nephew, Kenneth P.,Kim, Sun Oxford University Press 2013 Nucleic acids research Vol.41 No.18
<P>Aberrant DNA methylation of CpG islands, CpG island shores and first exons is known to play a key role in the altered gene expression patterns in all human cancers. To date, a systematic study on the effect of DNA methylation on gene expression using high resolution data has not been reported. In this study, we conducted an integrated analysis of MethylCap-sequencing data and Affymetrix gene expression microarray data for 30 breast cancer cell lines representing different breast tumor phenotypes. As well-developed methods for the integrated analysis do not currently exist, we created a series of four different analysis methods. On the computational side, our goal is to develop methylome data analysis protocols for the integrated analysis of DNA methylation and gene expression data on the genome scale. On the cancer biology side, we present comprehensive genome-wide methylome analysis results for differentially methylated regions and their potential effect on gene expression in 30 breast cancer cell lines representing three molecular phenotypes, luminal, basal A and basal B. Our integrated analysis demonstrates that methylation status of different genomic regions may play a key role in establishing transcriptional patterns in molecular subtypes of human breast cancer.</P>