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Introduction of Mobile-based Interactive Identification Key
Suwon Chun,Sungho Choi,Won-Young Choi,Yang-Seop Bae 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
Species identification, the process of finding the taxon to which a specimen belongs, is a difficult and frustrating task for most biologists but is absolutely fundamental to most biological research. However, proper species identification requires extensive knowledge on the particular taxon, thus can be problematic and confusing for non-professionals. To increase the accuracy of identification, computer-based interactive identification key has been widely used. In order to improve the identification process and promote effective utilization of Korean species, Korean Indigenous Interactive Key System (KIIS) was developed. Moreover, image-based online identification system was developed to broaden the range of users from non-experts to professionals. As the use of mobile device became significant in people’s lives, we further developed mobile web-based identification system.
Choi, Sungho,Yun, Young Jun,Kim, Sue Jin,Jung, Ha-Kyun Optical Society of America 2013 Optics letters Vol.38 No.8
<P>Eu(2+) and Mn(2+) codoped, white-emitting Na(Sr,Ba)PO(4) phosphors are prepared, and their emission properties, especially for thermal stability, are thoroughly investigated. The thermal quenching and Eu(2+)/Mn(2+) energy transfer efficiency are totally different in the ratio of alkaline earth metals in host composition, NaBaPO(4), Na(Sr(0.5)Ba(0.5))PO(4), and NaSrPO(4), respectively. Furthermore, by using near-ultraviolet light-emitting diodes (LEDs) and the corresponding Na(Sr(0.5)Ba(0.5))PO(4):Eu(2+), Mn(2+) phosphor as light converters, we demonstrate a bright and thermally stable white-emitting LED. The resultant LED exhibits a warm white light [~4900 K, CIE coordinates of (0.33, 0.31)] with excellent thermal and hydrolytic stabilities comparable to those of commercially available ones, Y(3)Al(5)O(12):Ce(3+) and BaMg(2)Al(16)O(27):Eu(2+). The proposed composition, with its efficient energy transfer, could enable Eu(2+) and Mn(2+) codoped Na(Sr,Ba)PO(4) to be a promising single component phosphor for cost-effective white-emitting LEDs.</P>
Sungho Kim,Sung-Jin Choi,Dong-Il Moon,Yang-Kyu Choi IEEE 2011 IEEE transactions on electron devices Vol.58 No.11
<P>The energy distribution of interface traps is extracted using an optically assisted charge pumping (optical CP) technique. Optically generated majority carriers through light illumination enable the CP process even in a floating-body (FB) device without an extra body contact. With the use of square pulses at different rising and falling times and the proposed analytical model, the energy distribution of the interface traps is investigated via an optical CP technique. The optical CP technique is useful to extract the energy distribution of interface traps, as well as the interface-trap density in nanoscale FB devices. The data extracted by the optical CP is verified in a comparison with the data extracted by subthreshold-slope techniques.</P>
Carrier Lifetime Engineering for Floating-Body Cell Memory
Sungho Kim,Sung-Jin Choi,Dong-Il Moon,Yang-Kyu Choi IEEE 2012 IEEE transactions on electron devices Vol.59 No.2
<P>A novel bias scheme is demonstrated for performance improvement of floating-body cell memory, particularly retention time. Its basic mechanism is based on carrier lifetime engineering, which takes advantage of generation lifetime that is longer than recombination lifetime. In addition, the proposed scheme is suitable for low-power operation; a high drain bias is unnecessary to generate excess carriers, which allows reliable endurance of up to 10<SUP>12</SUP> switching instances at 85 <SUP>°</SUP>C.</P>
Digital Predistortion Based on Combined Feedback in MIMO Transmitters
Sungho Choi,Eui-Rim Jeong IEEE 2012 IEEE communications letters Vol.16 No.10
<P>An adaptive digital predistortion (PD) technique is proposed for linearization of power amplifiers (PAs) in multiple-input multiple-output (MIMO) transmitters. Instead of constructing a separate feedback path at each PA, we propose a PD technique based on a combined feedback, which adds all the PAs' outputs to form a single feedback. We develop an algorithm for finding the multiple PA characteristics jointly from the combined feedback. The PD parameters are calculated from the identified PA characteristics. Although the proposed method requires more computations for PA identification than the conventional method, its hardware implementation is much simpler and can overcome the crosstalk problem of a radio frequency (RF) selector, which is necessary for multiple feedback selection. The simulation results show that, despite its simple structure, the linearization performance of the proposed method is almost the same as the separate multiple feedback method.</P>