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BRIEF REPORTS ON KAISTSAT-4 MISSION ANALYSIS
J. Seon,K. I. Seon,S. H. Kim,K. W. Min,B. J. Kim,R. C. K. Yong,L. F. Leong,H. J. Chun,H. S. Chang,H. S. Kim,J. S. Bae,Y. W. Choi,S. R. LEE,Y. H. Shin,K. S. Ryu,J. J. Lee,D. H. Lee,D. J. Park 한국우주과학회 2000 Journal of Astronomy and Space Sciences Vol.17 No.2
Lee, J.H.,Yang, W.I.,Kim, M.J.,Booth, J.C.,Leong, K.,Schima, S.,Rudman, D.,Sang Young Lee Institute of Electrical and Electronics Engineers 2005 IEEE transactions on applied superconductivity Vol.15 No.2
<P>We propose a modified two-tone method that could be used for sensitive measurements of the intrinsic microwave surface impedance (Z<SUB>S</SUB>) of thin superconductor films and the tanδ of a low-loss dielectric. An open-gap resonator scheme is used to measure the penetration depth (λ) of thin superconductor films and extract the intrinsic Z<SUB>S</SUB> of the superconductor films from its measured R<SUB>S</SUB><SUP>eff</SUP> and λ. We use a very small gap of 10 μm between the top plate and the rest parts of the resonator. The tanδ of rutile in the low 10<SUP>-7</SUP> range and the dielectric constant as high as ∼110 are observed at temperatures below 10 K at ∼15.2 GHz, which enable to measure the R<SUB>S</SUB> of the 10 mm-in-diameter YBCO films as low as ∼100 μΩ at the same frequency (f). The discrepancy between the R<SUB>S</SUB><SUP>eff</SUP> at ∼15.2 GHz and that at ∼8.5 GHz scaled to ∼15.2 GHz appears less than 2% when the relations of R<SUB>S</SUB> ∝ f<SUP>2</SUP> and tanδ ∝ f are used. We describe usefulness of our measurement method for measuring the intrinsic microwave properties of various superconductor samples.</P>
Nanoparticle-mediated inhibition of survivin to overcome drug resistance in cancer therapy
Wang, S.,Xu, Y.,Chan, H.F.,Kim, H.W.,Wang, Y.,Leong, K.W.,Chen, M. Elsevier Science Publishers 2016 Journal of controlled release Vol.240 No.-
The acquired resistance of human cancer cells to apoptosis is one of the defining hallmarks of cancer. Upregulated expression of inhibitors of apoptosis proteins (IAP) has been implicated in drug resistance in several cancers. Survivin (encoded by BIRC5), the smallest member of the IAP family, has been correlated with both the control of cell apoptosis and regulation of cell mitosis in cancer. Owing to its critical role in regulation of cell survival and development of cancer resistance, as well as its distinguishingly high level of expression in many types of cancer, survivin has long been regarded as a promising therapeutic target for cancer therapy. This review first presents an overview of the mechanism by which survivin regulates cell function, followed by a discussion of the current state of survivin-targeted therapies. We focus on the application of nanoparticulate systems to deliver survivin inhibitors, co-delivery of survivin inhibitors with chemotherapeutic agents, synchronous targeting of survivin, other drug resistant molecules, and survivin regulators. We conclude by highlighting the current limitations associated with survivin-targeted therapies and speculating on the future strategies to surmount these impediments.
Bolted connections to tubular columns at ambient and elevated temperatures - A review
N.H. Ramli Sulong,S.H. Leong,Mohammed Jameel 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.2
Tubular column members have been widely adopted in current construction due to its numerous advantages. However, the closed-section profile characteristics of tubular columns severely limit the connection possibilities. Welding type is acceptable but discouraged because of on-site issues. Blind-bolted connection is preferable because of its simplicity, economic benefit, and easy assembly. This paper presents a state-of-the-art review on bolted connections to tubular columns for bare steel tubes, including square and circular sections. Available studies on bolted connections at ambient and elevated temperatures are reviewed, but emphasis is given on the latter. Various methods of determining the connection performance through experimental, analytical, component based, and finite element approaches are examined. Future research areas are also identified.
Fabrication and characterization of RF nanoantenna on a nanoliter-scale 3D microcontainer
Park, Jung-rae,Choi, Daniel S,Gracias, D H,Leong, T G,Presser, N,Stupian, G W,Leung, M S,Kim, Young Keun IOP Pub 2011 Nanotechnology Vol.22 No.45
<P>We report the design and fabrication of a nanoantenna structure on the surface of a 3D nanoliter-scale container for the development of communicable nanoliter-scale chemical delivery systems. The porous container was self-assembled, after which the nanoantenna was fabricated on the top of the microcontainer using focused ion beam (FIB) ion-induced metal deposition. The nanoantenna was structured as a rectangular metal coil composed of platinum (Pt) nanowires (70 nm in width). The response of the nanoantenna structure was simulated using finite element software and showed a strong resonant feature at 10.8 GHz, which was confirmed by high frequency measurements. </P>
Debdulal Roy,M. E. Welland,S. H. Leong 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
A reflection-mode, apertureless (scattering type) scanning near-field optical icroscope (SSNOM) in reflection geometry with a tip focus monitoring facility has been developed and used for imaging dielectric contrast at the nanoscale in both direct-detection and heterodyne interferometric mode. The approach curves (plot of near-field signal with tip-sample separation) were obtained and these were used to predict extent of near-field signal collection. The quality of the images obtained by adopting the heterodyne interferometric technique has been compared with those obtained by direct detection. For the former, independent phase imaging was also possible and performed.