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액막법을 이용한 습식인산중의 우라늄(Ⅵ) 회수에 관한 실험적 고찰(1)
김광욱,박현수,유재형 한국화학공학회 1985 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.23 No.4
습식인산 중에 존재하는 소량의 우라늄을 담체로서 D₂EHPA와 TOPO를 함유한 W/O/W형태의 액막에 의하여 회수하였다. D₂EHPA와 TOPO에 의한 우라늄 추출은 발열반응인 반면에 역추출은 흡열반응이었으며 반응열은 역추출쪽이 더 큰 값을 나타내었다. 액막에 의한 물질전달은 확산 뿐만 아니라 역추출 과정도 율속단계임을 보였다. 본 연구의 실험변수로 사용된 계의 온도, 계면활성제의 농도, 교반속도, W/O비율, 담체의 농도, HF의 농도 등은 물질전달 속도 뿐만 아니라 액막의 안정성에도 영향을 미치므로 이 두 조건을 동시에 만족시킬 수 있는 최적 실험조건을 규명하였다. Experimental investigation was performed on the recovery of uranium (VI) from Wet Process Phosphoric Acid by the novel liquid surfactant membrane with carrier mediated counter transport mechanism through batch operation. The membrane carrier used were D₂EHPA and TOPO showing the synergistic effect. The extraction of uranium (VI) was an exothermic reaction and the stripping of urnaium complex was an endothermic reaction. The various experimental variables such as temperature of system, concentration of surfactant, stirring speed, W/O ratio, concentration of carrier, concentration of HF had to be properly controlled in order to maintain the membrane stability and the recovery efficiency of uranium. In the transfer riechanism of uranium (VI), both diffusion and stripping reaction were rate controlling steps. By use of ICP-Emission Spectroscopy as an analysis instrument, the efficiency of recovery and membrane breakage were simultaneously measured.
김광욱,변의홍 공주대학교 자원과학연구소 2019 자원과학연구 Vol.1 No.2
This present study was to demonstrate the immunological effect of annelida (Lumbricus rubellus) water extract on various immune cell models (bone-marrow derived macrophage and mouse splenocyte). Annelida water extracts are treated in the bone-marrow derived macrophage (BMDM) and splenocyte from mouse, and it was not found the cytotoxicity in dose below than 250 μg/mL. Cytokine (Tumor necrosis factor alpha; TNF-α, Interleukin-6; IL-6, Interleukin-1β; IL-1β) production activity tested in the BMDM was significantly increased by treatment of annelida water extracts. Cell surface marker (CD 80/86) mediated with immune cell activation was highly increased by treatment of extracts. Similarly, cytokine production activity in splenocyte, annelida water extracts treatment significantly increased the Th1 type of cytokines (Interferron-γ; IFN-γ) production, but not affected the Th2 type cytokines (Interleukin-4; IL-4) production. Therefore, these results suggest that water extract from annelida may be a powerful candidates for maintaining the immune system.
김광욱,백은미 대한건설보건학회 2022 대한건설보건학회지 Vol.4 No.2
Purpose: This study is based on a survey aimed at analyzing the effects of various changes during the COVID-19 pandemic on the depression of workers. Method: Data collection was conducted from May 20 to May 26, 2021 from 132 workers in the manufacturing and construction industries. Depression in connection with general characteristics was analyzed by independent sample t-test and variance analysis, and multiple regression analysis was used to identify the factors affecting depression. Result: 45.4% of the participants experienced depression during the COVID-19 pandemic. The differences in the level of depression among workers were caused by the following factors: gender; age; employment type; industry type; change in job stress; changes in fatigue level; fear of COVID-19. Conclusion: The level of depression of workers caused by COVID-19 is severe. Therefore, it calls for measures to reduce the worker depression, infection prevention activities to alleviate fear, and education and psychological support conducted on a regular basis. Also, the effects of job stress and fatigue caused by infectious diseases should be managed together.
김광욱,김화수 국제다문화의사소통학회 2012 국제다문화의사소통학회 학술대회 Vol.2012 No.11
이 연구에서는 시각장애 아동의 음운인식과 점자읽기의 발달을 알아보기 위하여 만 10세 시각장애 아동 7명과 만 12세 시각장애 아동 7명을 대상으로 음절인식(변별, 탈락, 합성, 대치), 음소인식(변별, 탈락, 합성, 대치), 점자읽기(단어읽기, 읽기 속도, 읽기 정확 도, 읽기 이해력) 검사를 실시하였다. 그 결과, 음절인식 과제에서는 연령 간 차이가 없 었으며 음소인식에서 연령 간에 유의한 차이가 나타났다. 특히 음소인식의 하위과제 중 음소탈락, 음소대치에서 두 연령 간에 차이가 있었다. 단어읽기에서는 차이가 나타나지 않았으나 읽기 속도, 읽기 정확도, 읽기 이해력에서 12세 아동들이 유의하게 높은 수행 을 보였다. 또한 음운인식과 점자읽기의 하위 과제 간 상관분석을 통해서 단어읽기 능력 은 음절변별, 음절대치, 음소변별능력과, 읽기 속도는 음소탈락, 음소대치, 음소합성 능력 과 관계가 있음을 알 수 있었다. 읽기 정확도는 음운인식과제 가운데 음소탈락, 음소대 치와, 읽기 이해력은 음소대치, 음절대치, 음소탈락, 음소합성, 음절변별과 상관이 있는 것으로 나타났다. In this, study, development of phonological awareness and braille reading of children with visual impairment in order to 10 years old children with visual impairment 7 and 12 years old children with visual impairment 7 to target syllable awareness(discrimination, deletion, synthetic, substitution), phonemic awareness(discrimination,, deletion, synthetic, substitution), braille reading(word reading, reading speed, reading accuracy, and reading comprehension) test was conducted. As a result, syllable awareness, there was no significant difference in syllable awareness, and there was a significant difference in phonemic awareness for age inter. Especially the sub-factors of phonemic awareness of there was a significantly difference in phoneme deletion, phoneme substitution for age inter. Even though there was no significant difference in word reading, but reading speed, reading accuracy, and reading comprehension showed high performance with 12 years children. Also correlation analysis inter sub-factors of phonological awareness and braille reading through word reading showed significant correlation with syllable discrimination, syllable substitution, phoneme discrimination. Reading speed showed significant correlation with phoneme deletion, phoneme substitution, phoneme synthetic. Reading accuracy showed significant correlation with phoneme deletion, phoneme substitution. Reading comprehension showed significant correlation with phoneme substitution, syllable substitution, phoneme deletion, phoneme synthetic, syllable discrimination.