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Highly Pathogenic Avian Influenza A(H5N6) in Domestic Cats, South Korea
Lee, KyungHyun,Lee, Eun-Kyoung,Lee, HyunKyoung,Heo, Gyeong-Beom,Lee, Yu-Na,Jung, Ji-Youl,Bae, You-chan,So, ByungJae,Lee, Youn-Jeong,Choi, Eun-Jin U.S. Department of Health and Human Services * Cen 2018 Emerging Infectious Diseases Vol.24 No.12
<P>In December 2016, highly pathogenic avian influenza (HPAI) infection with systemic pathologic lesions was found in cats in South Korea. Genetic analyses indicated that the feline isolates were similar to HPAI H5N6 viruses isolated in chicken farms nearby. This finding highlights the need for monitoring of domestic mammals during HPAI outbreaks.</P>
Bovine tuberculosis in an Asian small-clawed otter (<i>Aonyx cinerea</i>) in the Republic of Korea
Lee, Hyunkyoung,Kim, Jae-Myung,Jang, Yunho,Lee, Kyunghyun,Baek, Kanghyun,Lee, Boram,Kim, Ha-Young,Lee, Myoung-Heon,Ryoo, Soyoon,Bae, You-Chan,Choi, Eun-Jin,So, ByungJae SAGE Publications 2015 Journal of veterinary diagnostic investigation Vol.27 No.5
<P>Bovine tuberculosis caused by <I>Mycobacterium bovis</I> has a wide range of hosts including cattle and humans, but its incidence in otters is very rare. Our report describes a case of bovine tuberculosis in an Asian small-clawed otter (<I>Aonyx cinerea</I>). A deceased female otter ~2–3 years of age that was raised in an aquarium was submitted to the Animal and Plant Quarantine Agency (Anyang, Republic of Korea) for autopsy in June 2013. Following gross pathological examination, many white nodules were observed in the lungs and mesentery. The nodules showed central necrosis infiltrated with lymphocytes and macrophages and surrounded by fibrous tissue. Acid-fast bacteria were detected in the necrotic foci, but no fungi were observed. Molecular analysis led to the detection of <I>M. bovis</I>, which is identified in otters in some European countries such as Spain and France.</P>
TDOA-/FDOA-Based Adaptive Active Target Localization Using Iterated Dual-EKF Algorithm
Lee, Kyunghyun,Oh, Jinhwan,You, Kwanho IEEE 2019 IEEE communications letters Vol.23 No.4
<P>Most geolocation methods use only the time difference of arrival for estimating the emitter’s location. In this letter, to obtain the velocity estimate values of an active target, we use the frequency difference of arrival. The iterated dual-extended Kalman filter (EKF) algorithm is used as a geolocation process for a moving emitter. In comparison with the dual-EKF algorithm, the parameter estimation filter’s update speed of the iterated dual-EKF algorithm shows a high convergence rate through the iteration process. To verify the performance of the proposed algorithm, simulation results by using the iterated dual-EKF algorithm are presented.</P>
Encephalopathy caused by maternal deficiency of vitamin A in a calf
Kyunghyun Lee,Jongho Kim,Ujin Jeon,Yeon Hee Kim,Ha-Young Kim,ByungJae So,Eun-Jin Choi 한국동물위생학회 2019 韓國家畜衛生學會誌 Vol.42 No.4
Blindness was observed in five calves born from cattle fed only a commercial feed of growing stage and dried rice straws for about two years in a farm in Gyeongsangbuk-do province. Three of them died within a month after birth, and a body and sera of his mother and other 19 cattle were submitted for diagnosis. At necropsy, the calf was very weak and filled with cerebrospinal fluid in the cerebrum. Any histopathological lesion including atrophy of death of optic nerve cells was not observed, but the irregu-lar proliferation such as lace pattern of choroidal cells and lymphocytic infiltration just below choroid was observed. No pathogen was detected as a result of the etiological tests on the internal organs of calves and bloods. In addition, the levels of serum vitamin A in different affected and his mother cattle were all lower than normal. Finally, we determined this case as an encephalopathy caused by maternal vitamin A deficiency in a calf. This report is an extreme example of how important it is to supply ad-equate s diets and a good quality of hay for each stage of growth in cattle.
Neural Network-Based Laser Interferometer Compensation for Seismic Signal Detection
Lee, Kyunghyun,Kwon, Hyungkwan,You, Kwanho Hindawi Limited 2018 Journal of sensors Vol.2018 No.-
<P>We propose a seismic wave detection method in the frequency domain using a heterodyne laser interferometer, which is used in ultraprecision fields as a displacement measurement device. In seismology, it is important to accurately measure seismic waves. To overcome the limited frequency range and low resolution of accelerometers and velocimeters and to enhance the precision of seismic data analysis, we use the heterodyne laser interferometer as a seismic detection apparatus. We apply the data fusion algorithm with the adaptive standard deviation ratio ( <TEX>$ \varsigma $</TEX> ) derived from the neural network to improve the laser interferometer’s measurement precision. Moreover, by using the interferometric characteristics, we analyze the seismic data in the frequency domain. To determine the location of the epicenter from the body wave propagation analysis, we apply the STA/LTA algorithm to the measurement data. The effectiveness of the proposed laser interferometric seismometer is shown through experiments to locate the precise epicenter.</P>
Lee, Seung-Hun,Lee, Kyunghyun,Kim, Kyoo-Tae,Choi, Eun-Jin,Kwak, Dongmi Elsevier 2019 Parasitology international Vol.71 No.-
<P><B>Abstract</B></P> <P>A red-necked wallaby (<I>Macropus rufogriseus</I>) in the Republic of Korea, introduced from Australia, died in 12 d after exhibiting anorexia and diarrhea. Postmortem examination revealed that the wallaby died due to coccidiosis by <I>Eimeria</I> sp. Morphologically, <I>Eimeria</I> sp. identified closely resembled <I>E. mykytowyczi</I>. The 18S rRNA sequence analysis showed that <I>Eimeria</I> sp. identified in this study has a 98.5% identity with that in Australian red kangaroo (<I>M. rufus</I>). However, owing to insufficient molecular information on marsupial-specific <I>Eimeria</I>, exact species could not be determined. Phylogenetically, <I>Eimeria</I> sp. identified in this study belonged to clade five of the marsupial group.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First report on red-necked wallaby (<I>Macropus rufogriseus</I>) died due to coccidiosis in the Republic of Korea. </LI> <LI> Morphologically, <I>Eimeria</I> sp. identified closely resembled <I>E. mykytowyczi</I>. </LI> <LI> The 18S rRNA sequence analysis of <I>Eimeria</I> sp. belonged to clade five of the marsupial group. </LI> <LI> Considering the wallaby died 12 d after introduction from Australia, <I>Eimeria</I> sp. identified might not be indigenous. </LI> </UL> </P>
Polioencephalomalacia diagnosed in necropsied cattle in Korea
Lee, Kyunghyun,Choi, Eun-Jin,Jung, Ji-Youl,Lee, Hyunkyoung,Kim, Ji-Hyeon,So, ByungJae The Korean Society of Veterinary Service 2018 韓國家畜衛生學會誌 Vol.41 No.2
Polioencephalomalacia (PEM) is a neurologic disease of ruminants diagnosed by pathological approach. There is very little information available to understand bovine PEM in Korea. In this study, we investigated the diagnostic rate and pathological features of PEM in 334 necropsied cases of cattle submitted to the Animal and Plant Quarantine Agency in Korea from 2015~2017. PEM was diagnosed only in 13 (3.9%) Hanwoo, the Korean native cattle, and sporadically occurred in our country. The disease was the most diagnosed in fall season, and the age of the cows ranged from 1 month to 3 year. In all PEM cases, softening, and yellow discoloration of the gray matter in the cerebrum and fluorescence at the sites using ultraviolet illumination were grossly observed. Microscopically abundance of glial cells with vacuolar large cytoplasm and neuronal necrosis were commonly observed. This study suggests that future studies are necessary to identify the cause and pathogenesis for the control of PEM in our country.