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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>
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>
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>
Hα filter based accuracy improvement of heterodyne laser interferometer
Lee, Kyunghyun,Lim, Minwoo,Park, Jongkoo,You, Kwan-Ho IET 2014 Electronics letters Vol.50 No.4
<P>The advantage of a laser interferometer is in the high resolution it provides, especially in extremely sensitive nanometrology. The laser interferometer plays a crucial role in ultra-precision measurement areas. However, the measurement accuracy is limited by a nonlinearity error. The nonlinearity error of the heterodyne laser interferometer needs to be compensated for. An <I>H</I><SUB>∞</SUB> filter is applied to compensate for the nonlinearity error caused by the elliptic polarisation, two non-orthogonal beams and an imperfect optical alignment. The proposed compensation method using an <I>H</I><SUB>∞</SUB> filter can reduce the nonlinearity error. The experimental results show an improved accuracy and reliability.</P>
Digital Human Modeling을 이용한 보병 수송용 특수 차량의 인간공학적 개선
Kyunghyun Nam,Sungryul Park,Songil Lee,Gyouhyung Kyung,Jeongyeob Lee,Jonghyun Kim,Yongcheol Shin,Chiung Kim 대한인간공학회 2012 대한인간공학회 학술대회논문집 Vol.2012 No.11
Objective: The objective of this study is to evaluate Armored Personnel Carrier (APC) by using Digital Human Modeling (DHM) tools in order to identify ergonomic problems. Background: Ergonomic evaluation is especially important in designing tactical military vehicles, since the operator will experience significantly high cognitive and physical workloads while he/she controls the vehicle in combat situations. Although human factors standards, including MIL STD-1472, provide guidance for military vehicle design, it is not always possible to directly apply these standards to designing Korean military vehicles (e.g., due to demographic differences). In the design process, the use of DHM provides many benefits including reduced development cost and quantitative ergonomic design evaluation. This study suggests some improvements based on the ergonomic evaluations by using DHM tools and ergonomics checklists. Method: The APC was evaluated by using DHM tools (RAMSIS™ and 3D SSPP™) in terms of physical workload in ingress/egress, visibility, clearance, and reachability. For control panel evaluation, checklists based on ergonomics guidelines were used. Conclusion: The improvements in multiple aspects of APC are main results of this study and they are expected to be widely used in the development of next tactical military vehicles. Application: The results could be used in establishing military guidelines for ergonomic military vehicle design suitable for Korean soldiers. The suggested improvements would relieve APC users’ physical and cognitive workload, which results in increasing survivability in highly stressful situation.
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.