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Han, Changhee,Burn-Nunes, Laurie J.,Lee, Khanghyun,Chang, Chaewon,Kang, Jung-Ho,Han, Yeongcheol,Hur, Soon Do,Hong, Sungmin Elsevier 2015 Talanta Vol.140 No.-
<P><B>Abstract</B></P> <P>An improved decontamination method and ultraclean analytical procedures have been developed to minimize Pb contamination of processed glacial ice cores and to achieve reliable determination of Pb isotopes in North Greenland Eemian Ice Drilling (NEEM) deep ice core sections with concentrations at the sub-picogram per gram level. A PL-7 (Fuso Chemical) silica-gel activator has replaced the previously used colloidal silica activator produced by Merck and has been shown to provide sufficiently enhanced ion beam intensity for Pb isotope analysis for a few tens of picograms of Pb. Considering the quantities of Pb contained in the NEEM Greenland ice core and a sample weight of 10g used for the analysis, the blank contribution from the sample treatment was observed to be negligible. The decontamination and analysis of the artificial ice cores and selected NEEM Greenland ice core sections confirmed the cleanliness and effectiveness of the overall analytical process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report a method for ultra-low Pb isotope determination in polar ice using TIMS. </LI> <LI> Decontamination procedure was improved for a new Greenland deep ice core. </LI> <LI> The use of a PL-7 silica-gel activator enabled sufficient Pb ion beam intensity. </LI> <LI> The procedural blanks were negligible to obtain reliable data from Greenland ice. </LI> <LI> Reliable Pb isotope analysis was achieved for a few tens of picograms of Pb. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Changhee Han,Md-Mafizur Rahman,Jiyeong Shin,Juil Kim 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
Since 2007, diamide insecticides have been widely used in Korea to control various types of lepidopteran pests including Spodoptera exigua. For nearly a decade, diamide resistance in field populations of S. exigua across 18 localities has been monitored using bioassays. Based on the LC50 values, some field populations showed a high level of resistance against chlorantraniliprole, although regional and temporal variations were observed. To investigate resistance at a molecular level, mutations (Y4701C, I4790M, and G4946E) were examined in the ryanodine receptor (RyR), which is the primary mechanism underlying diamide insecticide resistance. As a result, only I4790M mutation was found in most of field populations. As resistance levels varied significantly despite the uniform presence of the I4790M mutation, we considered the presence of another resistance factor. Further, the I4790M mutation was also found in S. exigua specimens collected prior to the commercialization of diamide insecticides in Korea as well as in other countries, such as the USA. This finding led us to hypothesize that the I4790M mutation were predisposed in field populations owing to selection factors other than diamide use. For further clarification, we conducted whole-genome sequencing of S. exigua (449.83 Mb) and re-sequencing of 18 individuals. However, no additional non-synonymous mutations were detected in the RyR-coding region. Therefore, the high level of diamide insecticide resistance in Korean S. exigua is not caused by mutations at the target site, RyR, but is attributed to other factors that need to be investigated in future studies.
Changhee Han,Sungyoon Song,Yeuntae Yoo,Jaehyeong Lee,Gilsoo Jang,Minhan Yoon 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In the future, Distribution network will face many challenges due to increased acceptance of renewable resources such as photovoltaic (PV) and wind power. Typical problems that arise from increased penetration of renewable resources include overvoltage issues, load imbalances on each feeder, and fluctuations in power output. In this paper, we consider installing Soft-Open Points (SOPs) to solve these problems. SOP is a power electronic device installed at the normally-open point (NOP) of the distribution network. Typically, SOPs are comprised of voltage source converters (VSCs), which can control the power flow between the feeders. In this paper, we discuss the method of calculating the optimal operating point of a SOP using the Particle-Swarm Optimization (PSO) algorithm using the characteristics of the SOP that can independently control the active and reactive power flows. The IEEE-33 bus test system was modified to verify the proposed method and the objective function for the bus voltage deviation and the index for the total line losses can be minimized simultaneously by using the PSO algorithm to optimize the multiple objective function Algorithm.
Han, Changhee,Kim, Ah Reum,Hwang, Gunha,Kim, Rakhoon,Go, Woohyun,Lee, Ji Yeong,Lee, Jongbong,An, Soyon,Hwang, Tae Sung,Lee, Hee Chun The Korean Society of Veterinary Science 2022 大韓獸醫學會誌 Vol.62 No.1
A 10-year-old, spayed female, Doberman Pinscher dog presented with right forelimb lameness. On physical examination, painful reaction and crepitation were present at the right shoulder. Radiographic evaluation of the shoulder revealed nothing remarkable. On the ultrasonography of the right shoulder joint, 2 small echogenic masses accompanied by reverberation artifacts were observed in the right biceps tendon near its origin at the supraglenoid tuberosity. Based on these findings, we suspected biceps calcifying tendinopathy. Clinical signs resolved intermittently after administration of nonsteroidal anti-inflammatory drug. This study described the ultrasonographic findings of calcifying biceps brachii tendinopathy which is an unusual finding in dogs.