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Hoseong Choi,Gayeon Ha,Minsoo Kim 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
With the enhancement of the spatial resolution of satellite imagery (1 m or less), the satellite image analysis has been considered as the indispensable means for remote sensing of nuclear proliferation activities in the restricted access areas such as North Korea. Notably, in the case of an open-pit uranium mine, e.g. the Pyongsan uranium mine, the mining activity can be presumed if detecting the location and extent uranium tailing piles near shafts within temporal images. Several studies have researched on the target detection for minerals of interest such as limestone and coal to evaluate the economic activities by utilizing similarity measures, e.g., a spectral angle mapper and a spectral information divergence (SID). Thus, this paper presented a systematic change detection methodology for monitoring the uranium mining activity in the Pyongsan uranium mine with a similarity measure of SID. The proposed methodology using the target detection results consists of the following five steps. The first step is to acquire stereo images of areas of interest for change detection. The second step is to preprocess the stereo images as following measures: (i) the QUick Atmospheric Correction and the image-to-image registration with ENVI and (ii) the Gram-Schmidt pansharpening. The third step is to extract spectral information for minerals of interest, i.e., uranium tailing piles, by sampling pixels within the reference image. It is based on the satellite analysis report for the Pyongsan uranium mine by CSIS, which specified the location of the uranium tailing piles. As the fourth step, the target detection for uranium tailing piles was performed through the similarity measure of SID between the extracted spectral information and the spectral reflectance of the image. In the fifth step, the change detection was processed using the multivariate alteration detection algorithm, which compares the target detection results by canonical correlation analysis. Furthermore, this paper evaluated the performance of the proposed methodology with the change detection accuracy assessment index, i.e., the area under a receiver operating characteristic curve. In conclusion, this paper suggests the systematic change detection methodology utilizing time series analysis of target detection for uranium tailing piles, which can save time and cost for humans to interpret large amounts of satellite information at the restricted access areas. As future works, the feasibility of the proposed methodology would be investigated by analyzing distribution of minerals of interest regarding nuclear proliferation at Yongbyon, which has the historical events of suspicious nuclear activities.
Choi, Hoseong,Kim, Hyun Jung,Lee, Jin Hee,Kim, Ji Soo,Park, Seur Kee,Kim, In Seon,Kim, Young Cheol The Korean Society of Plant Pathology 2012 Plant Pathology Journal Vol.28 No.4
The chitinase producing Lysobacter enzymogenes C-3 has previously been shown to suppress plant pathogens in vitro and in the field, but little is known of the regulation of chitinase production, or its role in antimicrobial activity and biocontrol. In this study, we isolated and characterized chitinase-defective mutants by screening the transposon mutants of L. enzymogenes C-3. These mutations disrupted genes involved in diverse functions: glucose-galactose transpoter (gluP), disulfide bond formation protein B (dsbB), Clp protease (clp), and polyamine synthase (speD). The chitinase production of the SpeD mutant was restored by the addition of exogenous spermidine or spermine to the bacterial cultures. The speD and clp mutants lost in vitro antifungal activities against plant fungal pathogens. However, the gluP and dsbB mutants showed similar antifungal activities to that of the wild-type. The growth of the mutants in nutrient rich conditions containing chitin was similar with that of the wild-type. However, growth of the speD and gluP mutants was defective in chitin minimal medium, but was observed no growth retardation in the clp and dsbB mutant on chitin minimal medium. In this study, we identified the four genes might be involved and play different role in the production of extracellular chitinase and antifungal activity in L. enzymogenes C-3.
Highly Specific Detection of Five Exotic Quarantine Plant Viruses using RT-PCR
Choi, Hoseong,Cho, Won Kyong,Yu, Jisuk,Lee, Jong-Seung,Kim, Kook-Hyung The Korean Society of Plant Pathology 2013 Plant Pathology Journal Vol.29 No.1
To detect five plant viruses (Beet black scorch virus, Beet necrotic yellow vein virus, Eggplant mottled dwarf virus, Pelargonium zonate spot virus, and Rice yellow mottle virus) for quarantine purposes, we designed 15 RT-PCR primer sets. Primer design was based on the nucleotide sequence of the coat protein gene, which is highly conserved within species. All but one primer set successfully amplified the targets, and gradient PCRs indicated that the optimal temperature for the 14 useful primer sets was $51.9^{\circ}C$. Some primer sets worked well regardless of annealing temperature while others required a very specific annealing temperature. A primer specificity test using plant total RNAs and cDNAs of other plant virus-infected samples demonstrated that the designed primer sets were highly specific and generated reproducible results. The newly developed RT-PCR primer sets would be useful for quarantine inspections aimed at preventing the entry of exotic plant viruses into Korea.
Complete genome sequence of Bean pod mottle virus identified from common bean (Phaseolus vulgaris)
조연화,Hoseong Choi,Soo Yeon Choi,Sang-Min Kim,Yu Mi Choi,Bong-Choon Lee,Won Kyong Cho 한국미생물학회 2020 미생물학회지 Vol.56 No.4
Bean pod mottle virus (BPMV) in the genus Comovirus is a plant virus infecting common bean. We obtained genomes of two BPMV isolates referred as Tigerskin-A and Tigerskin-B consisting of two RNA segments from common bean plants displaying viral disease symptoms by RNA-sequencing. RNA1 encodes a single polyprotein containing five mature proteins while RNA2 encodes a single polyprotein containing a movement protein and two coat proteins. The two BPMV isolates showed high sequence similarity (99.65% to 99.70%) to two isolates, IA-Di1 and Iowa-Desmodium illinoense 1, from the Desmodium illinoense in USA belonging to a flowering plant in the bean family.
Review: Recent advances in household refrigerator cycle technologies
Choi, Seyoung,Han, Ukmin,Cho, Honghyun,Lee, Hoseong Pergamon 2018 Applied Thermal Engineering Vol. No.
<P><B>Abstract</B></P> <P>This paper comprehensively reviews household refrigerator technologies including current cycle options and future not-in-kind options. Most of the refrigerators are based on a vapor compression cycle (VCC), so that its options are reviewed and compared. The refrigerator cycles based on the VCC are categorized in three groups: dual evaporator cycles, expansion loss recovery cycles, and multi-stage cycles. For dual evaporator cycles, several methods of applying two evaporators are presented. For the expansion loss recovery cycle, ejector and expander cycles are explained. For multi-stage cycles, two-stage cycle and dual-loop cycle are mainly discussed. Moreover, refrigerants as a working fluid are reviewed. Lastly, not-in-kind technologies that are not based on the VCC, such as an absorption, thermoelectric, magnetic, thermoacoustic, and thermoelastic are presented for the application of domestic refrigerators. Even though they have not been widely used for household refrigerators due to insufficient reliability and lower performance, their potential is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recent studies on household refrigerator technologies are reviewed. </LI> <LI> Current household refrigerator cycle options are categorized and explained. </LI> <LI> Refrigerants for the refrigerator are comprehensively reviewed. </LI> <LI> Not-in-kind technologies for household refrigerators are introduced. </LI> </UL> </P>