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Kim, Baek-Jun,Kim, Su-Jin,Kang, Jun-Gu,Ko, Sungjin,Won, Sohyun,Kim, Hyewon,Kim, Heung-Chul,Kim, Myung-Soon,Chong, Sung-Tae,Klein, Terry A,Lee, Sanghun,Chae, Joon-Seok Mary Ann Liebert, Inc 2013 Vector borne and zoonotic diseases Vol.13 No.7
<P>Rodents and soricomorphs are animal hosts of fleas and associated zoonotic microbial pathogens. A total of 4,889 small mammals were collected from Gyeonggi and Gangwon Provinces, Republic of Korea, from 2008 through 2010, including: Apodemus agrarius (4,122, 84.3%), followed by Crocidura lasiura (282, 5.8%), Microtus fortis (257, 5.3%), Myodes regulus (77, 1.6%), Micromys minutus (71, 1.5%), Mus musculus (63, 1.3%), and 4 other species (17, 0.3%). A total of 1,099 fleas belonging to 10 species and 7 genera were collected. Ctenophthalmus congeneroides (724, 65.9%) was the most commonly collected flea, followed by Stenoponia sidimi (301, 27.4%), Neopsylla bidentatiformis (29, 2.6%), and Rhadinopsylla insolita (25, 2.3%). The remaining species accounted for only 1.8% (20, range 1-6) of all fleas collected. The 2 dominant flea species, C. congeneroides and S. sidimi, showed an inverse seasonal pattern, with higher populations of C. congeneroides from January-September, whereas S. sidimi was more frequently collected during October-December. The overall flea infestation rates (FIR) and flea indices (FI) were 14.1% and 0.22, respectively, and were highest during April-June (19.7% and 0.30, respectively). A total of 735 of the 1,099 fleas were assayed for the detection of Bartonella spp. by PCR using Bartonella-specific primers, of which 515 were positive for Bartonella, with an overall maximum likelihood estimate (MLE) of 700.7/1,000. The highest MLE values were observed during April-June (899.2) and July-September (936.2) trapping periods and, although lower, were similar for January-March (566.7) and October-December (574.1). C. congeneroides demonstrated high MLEs for all seasons (range 752.5-934.8), while S. sidimi was positive for Bartonella only during January-March (MLE=342.1) and October-December (MLE=497.2) collection periods. Continued long-term surveillance of small mammals and associated ectoparasites is needed to improve our understanding of the prevalence of Bartonella spp. in fleas and the role of fleas in the zoonotic maintenance and transmission of Bartonella to humans.</P>
Kim Kangjin,Lee Sanghun,Park Sang-Chul,Kim Nam-Eun,Shin Chol,Lee Seung Ku,Jung Youngae,Yoon Dankyu,Kim Hyeonjeong,Kim Sanghyun,Hwang Geum-Sook,Won Sungho 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Recent investigations have revealed that the human microbiome plays an essential role in the occurrence of type 2 diabetes (T2D). However, despite the importance of understanding the involvement of the microbiota throughout the body in T2D, most studies have focused specifically on the intestinal microbiota. Extracellular vesicles (EVs) have been recently found to provide important evidence regarding the mechanisms of T2D pathogenesis, as they act as key messengers between intestinal microorganisms and the host. Herein, we explored microorganisms potentially associated with T2D by tracking changes in microbiota-derived EVs from patient urine samples collected three times over four years. Mendelian randomization analysis was conducted to evaluate the causal relationships among microbial organisms, metabolites, and clinical measurements to provide a comprehensive view of how microbiota can influence T2D. We also analyzed EV-derived metagenomic (N = 393), clinical (N = 5032), genomic (N = 8842), and metabolite (N = 574) data from a prospective longitudinal Korean community-based cohort. Our data revealed that GU174097_g, an unclassified Lachnospiraceae, was associated with T2D (β = −189.13; p = 0.00006), and it was associated with the ketone bodies acetoacetate and 3-hydroxybutyrate (r = −0.0938 and −0.0829, respectively; p = 0.0022 and 0.0069, respectively). Furthermore, a causal relationship was identified between acetoacetate and HbA1c levels (β = 0.0002; p = 0.0154). GU174097_g reduced ketone body levels, thus decreasing HbA1c levels and the risk of T2D. Taken together, our findings indicate that GU174097_g may lower the risk of T2D by reducing ketone body levels.
전산유체역학(CFD)을 통한 지중점적관수 장치에 따른 압력강하 분석
김정식(Jeongsik Kim),김필(Phil Kim),김설하(Seolha Kim),김진현(Jinhyun Kim),엄덕호(Dukho Um),이상훈(Sanghun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Watering crops inside the soil is more efficient in terms of water saving than outside watering. To resolve this problem, we use the drip irrigation system which is used the Drip irrigation pipe. This system can save water by evenly supplying water directly into the roots of the crops. To determine which shape has good pressure drop, this study compares the two commercial Drip irrigation pipe and analyzes experiment and computational values through CFD. For calculation through CFD, the shape of the Drip irrigation pipe was produced in CAD based on actual measurement and calculated through ANSYS. Experiment used a water pump and was measured every 20 kPa in the range from 100 to 400 kPa.. This paper reports the advantages and disadvantages of both Drip irrigation pipes.
김민영 ( Minyoung Kim ),김영훈 ( Younghun Kim ),김상훈 ( Sanghun Kim ),최용훈 ( Yonghun Choi ),전종길 ( Jonggil Jeon ),김영진 ( Youngjin Kim ),서명철 ( Myungchul Seo ) 한국농공학회 2016 한국농공학회 학술대회초록집 Vol.2016 No.-
Due to a growing and aging population in agriculture, the adaptation of labor-saving, computer-controlled automatic irrigation system becomes more essential to increase crop yield and improve its quality. In addition, water shortage is becoming one of the biggest problem in the world, so much attention has been given to search for technologies/measures to save/conserve water from irrigated areas. The aim of this study is to develop an automatic irrigation system which measures timely variant soil moistures and automatically turns on or off the water supply system based on the programmed logics for blueberry outdoor cultivation. This system also provides the crop evapotranspiration calculated based on the weather data from nearby weather station. A soil moisture sensor is periodically interrogated by a pulse signal provided by the microcontroller via a driver or buffer circuit. A microcontroller is coupled in controlling relationship to the solenoid valves in each zone at predetermined times during a day unless the moisture sensor for that given zone indicates a predetermined sufficient level of moisture present. This study showed that the combination of hardware and software provides an irrigation controller that can be implemented at relatively low cost and which is extremely user friendly. Two-year monitoring and one-year field application showed that the automatic irrigation system based on soil moisture and weather data outperformed considering the fruit marketable yield and quality (weight, diameter, sugar content, firmness, etc.), water productivity and labor-saving.
BLE 응용을 위한 2.4GHz 대역의 CMOS RF 송수신기 설계
김광순(Kwangsoon Kim),정기상(Kisang Jung),김규형(Kyuhyung Kim),이상훈(Sanghun Lee),김성완(Sung-Wan Kim),이평한(Pyeong-Han Lee),박광범(Kwang-Beom Park),천성훈(Sung-Hun Chun),류창호(Chang-Ho Ryu),안광호(Kwang-Ho Ahn),김주성(Jusung Kim) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
In this paper, a 2.4GHz CMOS RF transceiver design for BLE(Bluetooth Low Energy) application is presented. The fully-differential RF transceiver is compliant with Bluetooth core specification v5.0. The transceiver is comprised of low-IF receiver and zero-IF transmitter. The overall DC current consumption for continuous Tx transmission at +0dBm output power is 12mA and for continuous Rx reception at –90dBm sensitivity is 13mA. The transceiver is fabricated in 90nm CMOS process and total die size is 5.74mm2 including baseband modem and electrostatic discharge I/O pads.
Shim, Jae-Hyun,Kim, Young-Hoon,Yoon, Han-Sol,Kim, Han-A,Kim, Ji-Soo,Kim, Jongsik,Cho, Nam-Hee,Kim, Young-Min,Lee, Sanghun American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.4
<P>Tuning geometrical parameters of lithium-mixed transition-metal oxide (LiTM) cathode materials is a promising strategy for resource-efficient design of high-performance Li-ion batteries. In this paper, we demonstrate that simple and facile geometrical tailoring of the secondary microstructure of LiTM cathode materials without complex chemical modification or heterostructure engineering can significantly improve overall electrochemical performance of the active cathode materials. An optimized LiTM with a bimodal size distribution of primary particles inside the secondary particles exhibits a 53.8% increase in capacity at a high discharge rate (10 C) compared to a commercially available reference and comparable rate capability after 100 charge/discharge cycles. The key concept of this approach is to maximize the beneficial effects arising from the controlled sizes of primary particles. Multimodal/multiscale microscopic characterizations based on electron tomography and scanning transmission electron microscopy, combined with electron energy-loss spectroscopy and energy-dispersive X-ray spectroscopy from the atomic level to the microscale level, were employed to elucidate structural origins of enhanced battery performance. This study paves the way for the resource-efficient microstructure design of LiTM cathode materials to maximize capacity and stability via simple adjustment of processing conditions, which is advantageous for mass-production applications.</P> [FIG OMISSION]</BR>