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2019~2021년 육군 군부대 말라리아의 역학적 특성: 매개체 감시활동을 중심으로
최지완 ( Jeewan Choi ),김유진 ( Yujin Kim ),하범만 ( Beomman Ha ),신현일 ( Hyunil Shin ),이버들 ( Buddle Lee ),주영훈 ( Younghoon Joo ),김재형 ( Jaehyung Kim ) 국군의무사령부 2022 대한군진의학학술지 Vol.53 No.1
Objective: Military malaria patients continuously occur despite the preventive efforts, and the ROK Army started the malaria vector surveillance program co-operated with the Korea Disease Control and Prevention Agency (KDCA) since 2019. This study was performed to investigate malaria-epidemiological characteristics through malaria-vector surveillance during 2019∼2021. Method: Anopheles spp. were collected from the surveillance military units for 22 weeks from May to September during 2019∼2021. The ratio of Anopheles spp. was calculated, and Anopheles spp. infected with Plasmodium vivax were identified by nested polymerase chain reaction (nPCR). Correlations between the number of Anopheles spp. and the number of military patients were analyzed using the Pearson correlation test. Results: A total of 5,513 Anopheles spp. were collected, 2,866 in 2019, 1,500 in 2020, and 1,147 in 2021. The ratio of Anopheles spp. in total mosquitoes was 62.4%, and numbers of infected Anopheles spp. were 29 pools (17 in 2019, 11 in 2020, and 1 in 2021). There was a strong positive correlation between the number of Anopheles spp. and the number of military malaria-patients by year, but there was no correlation by month except for Paju-si in 2020. Conclusion: Military units had a higher ratio of Anopheles spp. than civilian region, and infected Anopheles species were also continuously collected, so it was necessary to comply with malaria prevention rules including chemoprophylaxis. From our study, we concluded that malaria vector surveillance is crucial and should be continued, and through malaria-vector surveillance, it could be possible to predict the occurrence of military malaria-patients.
Extensive investigations of photon interaction properties for Zn x Te 100-x alloys
Harinder Singh,Jeewan Sharma,Tejbir Singh 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.8
An extensive investigation of photon interaction properties has been made for ZnxTe100-x alloys (wherex ¼ 5, 20, 30, 40, 50) to explore its possible use in sensing and shielding gamma radiations. The resultsshow better and stable response of ZnTe alloys for various photon interaction properties over the wideenergy range, with an additional benefit of ease in fabrication due to lower melting points of Zn and Te. Mass attenuation coefficient values show strong dependence on photon energy as well as composition. Effective atomic number has maximum value for Zn5Te95 and lowest for Zn50Te50 in the entire energyregion. The alloy sample with maximum Zeff shows minimal value of Ne and vice versa. Mean free pathfollows inverse trend as observed for mass attenuation coefficient. The exposure and energy absorptionbuildup factors depend upon photon energy, penetration thickness and composition (effective atomicnumber) of ZnxTe100-x alloys. It finds its application for sensing and shielding from highly energetic andhighly penetrating photons at sites where radioactive materials were used and visibility of material is nota big constraint. Further, energy down conversion property of ZnTe alloys with subsequent emission ingreen band suggests its potential use in sensing gamma photons.
Priyanka Dhatarwal,Ram Jeewan Sengwa 한국고분자학회 2019 Macromolecular Research Vol.27 No.10
The polymer blend (PB) films consisted of poly(vinylidene fluoride) (PVDF) and poly(ethylene oxide) (PEO) with different compositional ratios (i.e., PVDF/PEO =100/0, 75/25, 50/50, 25/75, and 0/100 wt%) have been prepared by solution casting method. These PB films were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and dielectric relaxation spectroscopy (DRS). The pristine films of PVDF and PEO have spherulite morphologies, which change enormously with the variation of their compositions in blend films. The EDX spectra confirm the linear variation of the amount of respective polymer elements, with the change of its compositional ratio in the PB films. The XRD and FTIR results confirm that the semicrystalline PVDF film has predominantly α- and β-phase crystals. The degree of crystallinity of these PB films exhibits non-linear increase, with increasing amount of PEO in the films. The relative fraction of the β-phase crystal of the PVDF in these complex PB films has been determined from the fractional relations based on the areas and intensities of crystalline peaks, observed in their XRD patterns which is found the maximum (~50%) for the 75 PVDF/25 PEO blend film. The dielectric dispersion of these PB films in the frequency window of 20 Hz-1MHz at 27 °C reveals that the real part of the complex permittivity is governed predominantly by the interfacial polarization effect at lower audio frequencies, whereas it mainly depends on the polymer compositional ratio at higher radio frequencies. The segmental relaxation process peak of the PEO chain observed in the loss part of the electric modulus spectra, shifts toward the lower frequency side with a significant suppression of intensity as the amount of PVDF enhances in the PB films. This result confirms that the PEO dynamics face considerable hindrance by the PVDF structures. The dc electrical conductivity of these PB films increases non-linearly with increasing amount of PEO in the films, and varies by more than an order of magnitude with the variation of the compositional ratio over the entire range. The temperature-dependent study of 50 PVDF/50 PEO blend film confirms its thermally activated dielectric properties and the structural dynamics with the relaxation activation energy of 0.23 eV. The compositional ratio-dependent dielectric properties of PVDF/PEO blend films offer a promising potential for their use as dielectric permittivity- and electrical conductivity-tunable insulating materials, with engineered functionality for flexible electronics and electrical devices.
Zinc Cobalt Layered Double Hydroxide Electrode for High-Performance Supercapacitor
사친아파라오파와,Sohyeon Yu,Hyungwoo Seo,Euijin Ju,Jeewan Yeu,Jaemin Kim,디파리파틸,신재철 한국진공학회 2019 Applied Science and Convergence Technology Vol.28 No.5
We aim to fabricate a ZnCo layered double hydroxide (LDH) nanostructure through facile one-pot hydrothermal synthesis. ZnCo LDH with interconnected hexagonal sheets having ultrathin thickness with voids are synthesized for the effective penetration of electrolytes to achieve superior electrochemical properties. The as-synthesized ZnCo LDH nanostructure is then subjected to structural, morphological, phase, and electrochemical studies. As an electrode for a supercapacitor, the ZnCo LDH has an areal capacitance of 1964 mFcm-2 at a 5 mVs-1 scan rate, an energy density of 0.22 mWhcm-2, and an excellent cycling stability (112 %) after 2000 charge–discharge cycles.
Experimental investigation of effective atomic numbers for some binary alloys
Renu Sharma,J.K. Sharma,Taranjot Kaur,Tejbir Singh,Jeewan Sharma,Parjit S. Singh 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.7
In the present work, the gamma ray backscattering technique was used to determine the effective atomic numbers for certain binary alloys. With the help of a muffle furnace, the binary alloys were synthesized using the melt quenching technique with different compositions of 82Pb, 50Sn, and 30Zn. The intensity distribution of backscattered photons from radioactive isotope 22Na (511 keV) was recorded with the help of GAMMARAD5 [76 mm × 76 mm NaI(Tl) scintillator detector] and analyzed as a function of both atomic number and thickness of the target material. The effective atomic numbers for the same binary alloys were also computed theoretically using the atomic to electronic cross-section method with the help of the mass attenuation coefficient database of WinXCom (2001). Good agreement was observed between theoretical and experimental results for the effective atomic numbers of all the selected alloys.
( Jeong Jae Lee ),( Seong Ho Choi ),( Jin Ho Cho ),( Jeewan Choe ),( Joowon Kang ),( Soyun Kim ),( Sangwoo Park ),( Hyunjin Kyoung ),( Dongoh Seo ),( Jee-yeon Cho ),( Il-hun Park ),( Sangnam Oh ),( Hy 한국축산학회 2019 한국축산학회지 Vol.61 No.6
This study was conducted to evaluate effects of dietary multi-carbohydrases (MCS) in a lactating sow diet on productive performance and immune responses of sows and their piglets. A total of 12 sows (218.37 ± 5.5 kg BW; 2 parity) were randomly assigned to 2 dietary treatments: a diet based on corn-soybean meal (CON) and CON with 0.01% MCS. The MCS contained xylanase (2,700 units/g), β-glucanase (700 units/g), and cellulase (800 units/g). Sows were fed the dietary treatments for 28 days (weaning) after farrowing. Blood samples were collected from sows on d 0, 3, and 7 after farrowing and randomly selected 2 nursing piglets in each sow on d 3, 7, and 14 after birth. Measurements were productive performance of sows, frequency of diarrhea of piglets, and immune responses of sows and their piglets. Sows fed MCS had lower (p < 0.05) their body weight change than those fed CON. Piglets from sows fed MCS had higher (p < 0.05) average weight gain and body weight at weaning day and lower (p < 0.10) frequency of diarrhea than those from sows fed CON. Sows fed MCS had lower number of white blood cells (WBC) on d 3 (p < 0.05) and TGF-β1 on d 7 (p < 0.10) during lactation than those fed CON. Similarly, piglets from sows fed MCS had also lower (p < 0.05) number of WBC on d 3 and d 7 and TGF-β1 and C-reactive protein on d 7 during lactation than those from sows fed CON. In addition, piglets from sows fed MCS had higher (p < 0.10) immunoglobulin G and M on d 7 during lactation those from sows fed CON. In conclusion, addition of dietary MCS in the lactating sow diet based on corn and soybean meal improved productive performance of sows and their litters and modulated their immune responses.