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Batzaya Baasankhuu,Donguk Choi,Sangsu Ha 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.2
Axial compression test was conducted to investigate the effect of confinement on plain concrete cylinders by wrapping polyethylene naphthalate fiber reinforced polymer (PEN FRP) with large rupture strain (LRS) capacity. To draw comparison on the confinement effect by PEN FRP wrapping, the confining effect by basalt FRP (BFRP) wrapping was also investigated. A total of 25 tests was completed. Test variables were two different FRP composites (PEN FRP, BFRP) and number of FRP layers (1, 2, 3 layers of PEN FRP and 2, 4, 6 layers of BFRP) in the main confinement tests (21 tests). In the additional confinement tests, the test variable was overlap length of PEN FRP (four tests). Confinement by BFRP and LRS PEN FRP was both effective as demonstrated by continuously ascending stress–strain relationship of the confined concrete. The PEN FRP wrapped concrete deformed more both axially and laterally to develop strength equivalent to that of the BFRP wrapped concrete. A simplified procedure for rational modelling of stress-strain relationship of the confined concrete was suggested. The suggested procedure is applicable for both BFRP and PEN FRP confined circular concretes on condition that basic confinement test data specific to the FRP composite are provided.
Batzaya Shinebayar,Se Yong Gill,Haemin Jeong,Kyung-Chan Choi,Junshik Hong,Sang Min Park 이화여자대학교 의과학연구소 2017 EMJ (Ewha medical journal) Vol.40 No.2
Pericardial drainage is an important diagnostic and therapeutic option in the symptomatic patient with large amount of pericardial effusion (PE). However, when the amount of PE is relatively small, physicians are often reluctant to perform the invasive drainage of the fluid due to the increased risk of causing myocardial injury during the procedure. Even in some cases of suspected pericarditis with small amount PE, an initial empirical anti-inflammatory therapy is often recommended. A 65-year-old woman presented with mild dyspnea for two weeks. The echocardiography revealed small amount of PE. A careful fluoroscopy-guided pericardiocentesis, subsequent pericardial fluid cytology, and thorough whole body check-up demonstrated adenocarcinoma with no proven primary site. After the palliative chemotherapy, she had survived for 15 months until her death due to asphyxia. Although pericardiocentesis is considered dangerous in small amount of PE, a prompt and careful drainage may provide early detection of hidden malignancy and better survival outcome. (Ewha Med J 2017;40(2):91-93)
Prevalence of HBV and HCV in Mongolia
( Munkhchuluun Batzaya ),( Dashchirev Munkh-orshikh ),( Baasankhuu Enkhtuvshin ),( Oidov Baatarkhuu ) 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: Mongolia is the highest prevalent of hepatitis B and C virus infections. Viral hepatitis is still decreasing when observing its movements, but the disease will remain highly prevalent until 2030. Using high-sensitivity test results of CLEIA we aimed to investigate the prevalence of hepatitis B and C virus, and compare levels of AST, ALT and M2BPGI in the Mongolian population in the age between 40-64. Methods: In order to reflect the administrative and geographical features of Mongolia, the sampling was done at three levels: urban, province center, and rural. Immunological test was measured by chemiluminescence enzyme immunoassay (CLEIA). The statistical package for the social sciences (SPSS) version 25 was used for the statistical analyses. Results: The survey covered 3196 people. 71.8 percent of the patients surveyed had a negative in hepatitis test. 10.1 percent had a positive HBsAg test. 17 percent had a positive anti-HCV test. 1.1 percent had both a positive both HBsAg and anti-HCV (<.0001). AST and ALT increased more frequently during co-infection. M2BPGI protein average level in the non-infected group was 1.00 C.O.I, in the HBsAg positive group 1.65 C.O.I, in the anti-HCV positive group 1.83 C.O.I, and in the co-infection group 1.87 C.O.I (<.0001). Conclusions: 10.1 percent of 40-64year-olds in Mongolia were infected with hepatitis B virus, and 17 percent had Hepatitis C virus and 1.1 percent had hepatitis B and C virus co-infections. Serum M2BPGi is increasing in hepatitis C virus infection and in co-infection.
오남식,Batzaya Tumur-ulzii,조성찬,함미현,김원호,이명현 대한통합치과학회 2019 대한통합치과학회지 Vol.8 No.3
The aim of this study was to investigate the effect of airborne-particle abrasion(APA) treatment on the shear bond strength of resin cement to hybrid ceramic, MAZIC Duro(Vericom, Korea). The hybrid ceramic specimens were treated with airborne alumina oxide particles and bonded with 6 types of resin cement (Rely X Ultimate Clicker, Multilink N, U-Cem, Super Bond C&B, Panavia F 2.0, and BisCem). All the steps were performed by the same operator according to the manufacturer's instructions of resin cement respectively. All specimens were subjected to shear bond strength testing using a universal testing machine with a crosshead speed of 1mm/min. All data were statistically analyzed using one-way analysis of variance and multiple-comparison least significant difference tests (α = 0.05). In this study, hybrid ceramic bonded with Super Bond and Rely X Ultimate Clicker were significantly stronger than those bonded using other resin cement (p<0.05).
최동욱,김영호,Batzaya Baasankuu,CHINZORIGT GOMBOSUREN 아시아콘크리트학회 2020 Journal of Asian Concrete Federation Vol.6 No.1
Bond and durability characteristics of basalt fiber reinforced polymer (BFRP) and polyethylene naphthalate (PEN) fiber/PEN FRP were investigated. Magnitude and distribution of the bond stress between BFRP/PEN FRP and concrete were investigated by double lap shear test. Four different types of durability test were performed: (1) Beam bond test following accelerated conditioning protocols by ACI 440.9R using plain concrete beams strengthened with BFRP or PEN FRP; (2) tensile test of PEN fiber/PEN FRP after immersion in 1N NaOH, 3% NaCl solutions, and water up to 6 months; (3) tensile test of PEN fiber/PEN FRP after immersion in 5% and 10% diluted solutions of HCl; and (4) exposure to natural outdoor environment. Bond test results indicated high bond stress developing over relatively short distance for BFRP that has high elastic modulus (EBF = 68.4 GPa) while relatively low bond stress developing over longer length for PEN FRP that has low elastic modulus (EPEN = 17.4 GPa). In the beam bond test, very good behavior was shown by PEN FRP after 4 month’s exposure to wet and alkaline conditions while moderate behavior was shown by BFRP. Overall, the performance of PEN fiber/FRP was satisfactory in all durability tests conducted in this study.
ANALYSIS OF AIR QUALITY INDICATORS: Particulate Matter (PM2.5) in Ulaanbaatar City Mongolia
Zolzaya Gungaa,Usukhbayar Bayarsaikhan,Batzaya Gungaa 단국대학교 몽골연구소 2023 몽골지역연구 Vol.8 No.2
Regarding the sources of air pollution in Ulaanbaatar city, 56% is caused by households, heating boilers, and coal consumption, 20% by vehicle emissions and dust, 10% by power plant coal consumption, and 14% by garbage and soil pollution. In a report issued by WHO in December 2020, it was noted that the amount of fine particle matter PM2.5, which is one of the air pollutants in Ulaanbaatar city, is 27 times higher than the permissible level. This study shows that the number of people who die from esophageal cancer increases by 70 and the number of people who die from lung cancer increases by 1 μg/m3 in Ulaanbaatar city. Also, in the calculation of the average concentration of fine particulate matter PM 2.5, it was 12-19 μg/m3 higher than the standard level in the first and fourth quarters, and 37-40 μg/m3 lower than the standard level in the second and third quarters. The results of the analysis showed that when the amount of PM 2.5 increases by 1 μg/m3, road and transport accidents increase by 705. In the city of Ulaanbaatar, when particulate matter (PM2.5) in the air, increases by 1 μg/m3, GDP tends to decrease by MNT 466,925 million, budget income by MNT 19,062.9 million, and labor force by 1,664 people. The mean absolute percentage error (MAPE)=2.3% indicates that the prediction is optimal. Effective implementation of air quality management is essential to reduce air pollution. In terms of air quality management, it is necessary to determine the goals and objectives, evaluate the situation, make an action plan for further implementation, implement it, conduct monitoring and evaluation, and use the results of the evaluation to determine the next goals and objectives and continuously improve them.