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Analysis on the Findings of Serum Biochemical Test in Inhabitants Infected with Clonorchis sinensis
Woon-Mok Sohn,Young-Pyo Cho,Kee-Jin Kim,Mi-Young Kim,Chong-Wook Lee,Do-Hum Park 대한의생명과학회 2001 Biomedical Science Letters Vol.7 No.1
The findings of serum biochemical tests in the inhabitants residing in some riverside areas of Kyongsangnam-do were analized to know the correlation with the Clonorchis sinensis infection. A total of 2,722 fecal samples of inhabitants was examined by Kato's cellophane thick smear and formalin-ether sedimentation methods, and their serums were analized biochemically. Three hundred and thirty-three inhabitants (12.2%) were positive with C. sinensis eggs (egg-positive group), and remaining 2,389 were negative (egg-negative group). In the egg-positive group, the positive rate of aspartate aminotransferase (AST) was 6.9% (male: 10.3%; female: 3.2%), that of alanine aminotransferase (ALT) was 6.3% (male: 9.1%; female: 3.2%), of γ-glutamyl transpeptidase (γ-GTP) was 9.0% (male: 13.1%; female: 4.4%), and that of α-fetoprotein (AFP) was 3.0% (male: 2.9%; female: 3.2%). In the egg-negative group, the positive rate of AST was 5.2% (male: 8.9%; female: 3.2%), that of ALT was 5.1% (male: 8.6%; female: 3.2%), of γ-GTP was 7.5% (male: 13.0%; female: 4.5%), and that of AFP was 0.3% (male: 0.5%; female: 0.1%). In the egg-positive group, 127 cases (38.1%) were light infection, 108 (32.4%) were moderate infection, 64 (19.2%) were heavy infection, and 34 (10.2%) were very heavy infection. The positive rates of all tests were high according to the intensity of infection. From the above results, It was confirmed that prevalence of clonorchiasis is still high in some riverside areas of Kyongsangnam-do, and findings of serum biochemical tests are not different between the egg-positive group and egg-negative group. However, there were some difference in the positive rates of serum AST, ALT, γ-GTP and AFP by the age, sex and the intensity of infection.
Analysis on the Findings of Serum Biochemical Test in Inhabitants Infected with Clonorchis sinensis
Sohn, Woon-Mok,Cho, Young-Pyo,Kim, Kee-Jin,Kim, Mi-Young,Lee, Chong-Wook,Park, Do-Hum 대한의생명과학회 2001 Journal of biomedical laboratory sciences Vol.7 No.1
The findings of serum biochemical tests in the inhabitants residing in some riverside areas of Kyongsangnam-do were analized to know the correlation wish the Clonorchis sinensis infection. A total of 2,722 fecal samples of inhabitants was examined by Kato's cellophane thick smear and formalin-ether sedimentation methods, and their serums were analized biochemically. Three hundred and thirty-three inhabitants (12.2%) were positive with C. sinensis eggs (egg-positive group), and remaining 2,389 were negative (egg-negative group). In the egg-positive group, the positive rate of aspartate aminotransferase (AST) was 6.9% (male: 10.3%; female: 3.2%), that of alanine aminotransferase (ALT) was 6.3% (male: 9.1%; female: 3.2%), of γ-glutamyl transpeptidase (γ -GTP) was 9.0% (male: 13.1%; female: 4.4%), and that of α-fetoprotein (AFP) was 3.0% (male: 2.9%; female: 3.2%). In the egg-negative group, the positive rate of AST was 5.2% (male: 8.9%; female: 3.2%), that of ALT was 5.1% (male: 8.6%; female: 3.2%), of γ -GTP was 7.5% (male: 13.0%; female: 4.5%), and that of AFP was 0.3% (male: 0.5%; female: 0.1%). In the egg-positive group, 127 cases (38.1%) were light infection, 108 (32.4%) were moderate infection, 64 (19.2%) were heavy infection, and 34 (10.2%) were very heavy infection. The positive rates of all tests were high according to the intensity of infection. From the above results, It was confirmed that prevalence of clonorchiasis is still high in some riverside areas of Kyongsangnam-do, and findings of serum biochemical tests are not different between the egg-positive group and egg-negative group. However, there were some difference in the positive rates of serum AST, ALT, γ -GTP and AFP by the age, sex and the intensity of infection.
Photocatalytic properties of ceramics TiO2 nanocomposites from waste resources
Soon-Do Yoon,이정환,Yeon-Hum Yun 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.2
Ceramics TiO2 nanocomposites were prepared by using titanium oxide (TiO2) nanoparticles, fly ash from the thermal powerplant and the mixed waste glass powder. We applied a mechanical milling method and thermal reaction in this process. Thephotocatalytic activities were estimated for methyl orange (MO), acetaldehyde (ATA), 2,4-dichlorophenoxyacetic acid (2,4-D),and methylene blue (MB) as photodegradation targets. Crystallinity, morphological properties, and chemical compositions forprepared ceramics TiO2 nanocomposites were also observed by X-ray diffraction (XRD), field emission-scanning electronmicroscopy (FE-SEM), and energy dispersive X-ray spectrometer (EDS). In addition, density, compressive strength, bendingstrength and chemical durability were measured to characterize the physicochemical properties of TiO2 nanoparticle contents (0-20 wt%). It was verified that addition of TiO2 nanoparticles considerably improves the physicochemical properties of theprepared nanocomposites samples. With increased TiO2 nanoparticle content, the photocatalytic activities of the ceramics TiO2nanocomposites for photodegradation target materials increased under UV light irradiation. The degree of photocatalyticdegradation of MO, ATA, 2,4-D, and MB in the ceramics TiO2 nanocomposites improved to about 0.264, 0.141, 0.302, and 0.368,respectively, after the UV irradiation for 240 min when 20 wt% TiO2 nanoparticle was added. In addition, the photocatalyticdegradation rate of photodegradation target materials was evaluated using the pseudo-first-order kinetics proposed by Lagergren.
보육시설에 적용된 진공관식 태양열 급탕 시스템의 하절기 에너지성능 실증평가
김도관(Do-Gwan Kim),고명진(Ko Myeong-Jin),김용식(Kim yong-Shik),조영흠(Cho Young-Hum),조재훈(Jo Jae-Hun) 한국생활환경학회 2015 한국생활환경학회지 Vol.22 No.5
Renewable energy systems are expected to play a significant role in resolving issues of energy resource depletion and climate change by using infinite and clean natural energy. In this study, we carried out the performance evaluation on energy production and use of solar water heating system installed in a nursery school in summer season. The results showed the energy savings expected from the application of the solar water heating systems despite the irregular energy production due to the effect of the weather. As a result, the energy production of the solar water heating system was greatly dependent on the weather conditions and solar radiation. Collector efficiency refers to the changing production of the collector by the solar radiation, which is affected by the weather conditions, and the collector efficiency curve shows the variations, for which the solar radiation was the greatest influencing factor. Hence, solar hot water system the hot-water load of the building and the weather conditions, and a long-term empirical assessment of this relationship is needed.
Chemical durability of glass-ceramics obtained from waste glass and fly ash
Soon-Do Yoon,Yeon-Hum Yun 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.2
Applying the mechanical milling method and annealing procedure, we prepared glass-ceramics using fly ash from a thermal power plant mixed with waste glass cullet to resolve the environmental waste recycling problem and find out the optimum crystallizing mechanism. The chemical durability of the heat-treated specimens [850oC, 950oC and 1000oC] was investigated by measuring the weight changes, morphological properties, and chemical composition at the sample surfaces before and after acid immersion by field emission–scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometry (EDS). Various properties, such as density, compressive strength, bending strength and Vickers hardness of specimens [before and after acid immersion] were observed. Regardless of chemical treatment, glass-ceramics heat-treated at 850oC, 950oC and 1000oC showed sufficient mechanical properties for practical usage. Applying the mechanical milling method and annealing procedure, we prepared glass-ceramics using fly ash from a thermal power plant mixed with waste glass cullet to resolve the environmental waste recycling problem and find out the optimum crystallizing mechanism. The chemical durability of the heat-treated specimens [850oC, 950oC and 1000oC] was investigated by measuring the weight changes, morphological properties, and chemical composition at the sample surfaces before and after acid immersion by field emission–scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometry (EDS). Various properties, such as density, compressive strength, bending strength and Vickers hardness of specimens [before and after acid immersion] were observed. Regardless of chemical treatment, glass-ceramics heat-treated at 850oC, 950oC and 1000oC showed sufficient mechanical properties for practical usage.
The characterization of glass-ceramics made from waste glass and fly ash
Yeon-Hum Yun,Cheon-Young Park,Soon-Do Yoon 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.6
Glass-ceramics with well-crystallized whisker-type crystals were prepared by milling and heat treatment using fly ash from a thermal power plant and waste glass cullet. Various heat treatment temperatures [850, 900, 950 and 1000 oC] were used to obtain a glass-ceramics that have the optimum crystal phase and mechanical properties. The crystallization of a whisker-type phase in the matrix was achieved in the heat treatment temperature range of 950-1000 oC, and the whisker-type main crystal phase in the glass-ceramics was wollastonite [CaSiO3] The heat treatment temperature range [950-1000 oC] also brought about much better mechanical properties. Crystallinity, morphological properties, and chemical compositions were observed by Xray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and an energy dispersive X-ray spectrometer (EDS). Various properties such as density, compressive strength, bending strength and chemical durability were also examined. Glass-ceramics with well-crystallized whisker-type crystals were prepared by milling and heat treatment using fly ash from a thermal power plant and waste glass cullet. Various heat treatment temperatures [850, 900, 950 and 1000 oC] were used to obtain a glass-ceramics that have the optimum crystal phase and mechanical properties. The crystallization of a whisker-type phase in the matrix was achieved in the heat treatment temperature range of 950-1000 oC, and the whisker-type main crystal phase in the glass-ceramics was wollastonite [CaSiO3] The heat treatment temperature range [950-1000 oC] also brought about much better mechanical properties. Crystallinity, morphological properties, and chemical compositions were observed by Xray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and an energy dispersive X-ray spectrometer (EDS). Various properties such as density, compressive strength, bending strength and chemical durability were also examined.
Fabrication and photocatalytic properties of ceramic ZnS nanocomposites
Soon-Do Yoon,Jeong Woo Yun,Yeon-Hum Yun 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.4
Ceramic ZnS nanocomposites were prepared by mechanical processing and one-step heat sintering with powder mixtures offly ash, waste glass, and ZnS (template-free hydrothermal method manufacturing). Chemical durability and morphologicalcharacteristics of heat-treated samples at 800 oC with/without acid treatment were evaluated. The photocatalytic activities wereestimated with methyl orange (MO), methylene blue (MB), acetaldehyde (ATA), and 2,4-dichlorophenoxyacetic acid (2,4-D) asphotodegradation targets. Crystallization behaviors of the prepared ceramic ZnS nanocomposites were investigated using Xraydiffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and energy dispersive X-ray spectrometry(EDS). In addition, compressive and bending strength as mechanical properties were evaluated. Ceramic ZnS nanocompositeswere found to showed improvement in optimal photocatalytic reaction and physical properties regardless of acid treatmentwhen the amount of ZnS nanoparticles was increased from 7.0 to 25.0 wt%. Degrees of photocatalytic decomposition of MO,ATA, 2,4-D, and MB by acid treated ceramic ZnS nanocomposites containing 25 wt% ZnS were about 0.185, 0.121, 0.216,0.236, respectively, after UV irradiation for 180 min.
키토산 기반 분자 각인 고분자 필름의 슐린닥 흡착 및 방출 특성
윤연흠 ( Yeon-hum Yoon ),윤순도 ( Soon-do Yoon ),나재운 ( Jae Woon Nah ),심왕근 ( Wang Geun Shim ) 한국공업화학회 2019 공업화학 Vol.30 No.2
분자인식기술은 특정 분자를 고분자 매트릭스에 각인시켜 특정 분자의 선택성을 높이는 기술로 관심을 받아왔다. 이 연구에서는 Sulindac (SLD)을 각인시킨 키토산 기반 약물 전달용 필름의 흡착 및 방출 특성을 가소제, 온도, pH를 변화시켜 실험하고 그 결과를 관련 모델식으로 해석하였다. SLD 각인 고분자 필름의 약물 흡착은 Freundlich와 Sips식이 Langmuir식보다 더 잘 설명되었고 binding site 에너지 분포 함수는 SLD와 고분자 필름 간의 흡착 특성관계를 이해하는데 유용하였다. 그리고 SLD 각인 고분자 필름의 약물 방출은 Fickian 확산 거동을 보인 반면, 인공피부조건에서는 non-Fickian 확산 거동을 따랐다. Molecular recognition technology has attracted considerable attention for improving the selectivity of a specific molecule by imprinting it on a polymer matrix. In this study, adsorption and release characteristics of chitosan based drug delivery films imprinted with sulindac (SLD) were investigated in terms of the plasticizer, temperature and pH and the results were also interpreted by the related mathematical models. The adsorption characteristics of target molecules on SLD-imprinted polymer films were better explained by the Freundlich and Sips equation than that of the Langmuir equation. The binding site energy distribution function was also useful for understanding the adsorption relationship between target molecules and polymer films. The drug release of SLD-imprinted polymer films followed the Fickian diffusion mechanism, whereas the drug release using artificial skin followed the non-Fickian diffusion behavior.