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장성호,정영빈,배종명,홍성철,서정민,이병인,이재용,박진식,문추연 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.8
The mother machine makes the necessary shape by processing materials such as metal. The SCFs are applied to theprocessing surface when the mother machine processes the material, thereby improving the cutting conditions. SCFscontain high concentrations of organic components and nitrogen compounds, which can cause problems such aseutrophication and algae bloom. Therefore, proper treatment is required. Electrochemical treatment is expected to be analternative to conventional processes, and to be useful in various wastewater treatments. Moreover, it is an efficientelimination technique for contaminants and has a simple equipment composition. In this study, the removal efficiency ofthe T-N contained in the waste SCF using electrochemical treatment is analyzed. The electrode was made of titaniumand iridium, made into a perforated metal sheet to prevent an imbalance of the sample concentration in the reactor. Experiments were conducted to examine the effects of current density and the concentration of the supporting electrolyte(NaCl, Na2SO4) on removal efficiency. In the cases with 60 A/m2, 80 A/m2, and 100 A/m2 current densities, the removalefficiencies of the T-N contained in the waste SCF were 51.03%, 68.83%, and 79.58%. Comparing between the additionand non-addition of NaCl, the removal efficiency with the addition of NaCl (5 ~ 10 mM) was higher than for no additionat 60 min for all current densities. The addition of Na2SO4 increased the removal rate of the T-N, but it was less effectivethan NaCl addition
장성호,김고은,배종명,이병인,시바쿠마르,정은상,이재용,박진식,류재용 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.8
As industry continues to develop, the amount of various recalcitrant substances that cannot be removed by conventionalwastewater treatment has increased in modern society. The SCFs (Soluble Cutting Fluids) used in metalworking processescontain many chemical substances, such as mineral oils, anticorrosive agents, extreme-pressure additives and stabilizers,as well as high concentrations of organics. Recently, electrolysis has been expected to become an alternative toconventional processes and to be useful in various wastewater treatments. Electrolysis is a highly adaptable industrialwastewater treatment method, having a high efficiency, short processing time, and simple equipment composition,regardless of the biodegradable nature of the contaminants. The effects of operating time, current density, and electrolyteon COD removal of waste SCFs have been studied using the stainless steel (SUS316) electrode in a batch type reactor. The results were as follows. ① Without electrolytes, when the current density was adjusted to 40 A/m2, 60 A/m2, and80 A/m2, the removal efficiencies of the COD were 25.0%, 37.7%, and 49.1% after 60 min, respectively. ② In thecomparison between NaCl (5 ~ 10 mM) addition and non-addition, the removal efficiency with NaCl was higher than forwithout after 60 min for all current densities. ③ In the comparison between Na2SO4 (5 ~ 10 mM) addition and nonaddition,the removal efficiency with Na2SO4 showed no significant difference to that with NaCl at all current densities
장성호 한국동북아학회 2002 한국동북아논총 Vol.7 No.3
군의 정치개입에 있어서 정치에의 불간섭에 대한 외부세력의 압력 요인들은 여전히 중요한 변수로 작용한다. 그것은 전략적, 경제적, 지정학적 요인들이 위기에 처해 있을 때 타국의 내정에 대한 강국의 압력이 직·간접적으로 나타남을 뜻한다. 세계에서 그 어느 곳도 동아시아만큼 지정학적 요인이 정치적 지형을 형성한 곳은 없었다. 냉전기 미국의 전략은 동아시아의 인민과 엘리트들의 정권 선택의 범위를 부여했으며, 맥아더 사령관은 패전국 일본에게 미국식 민주주의를 강요했다. 또한 미국은 한국과 대만에서 분단국가를 세우고 유지하는 데 핵심적인 역할을 했다. 미국은 동아시아에서 공산주의를 봉쇄하려는 냉전 전략으로 이 지역에 반공 완충국을 수립하려 하였고, 이러한 미국의 전략에 남한과 대만의 민주주의 발전은 종속되었다. 본 논문에서는 이러한 인식 하에서 한국군부의 두 번에 걸친 정치개입, 즉 구군부와 신군부의 쿠데타에서 나타난 군부의 정치개입에 대한 환경과 미국의 역할을 분석하고, 군부 정치권력 획득의 추동과정을 미국적 요인을 중심으로 분석하고자 했다. 연구결과 한국군부가 정치개입을 통하여 정치권력을 장악함으로써, 한국은 분단체제하에서 강성국가를 지향하게 되고, 안보와 경제면에서 대미 종속성을 한층 더 강화하게 되었다. 뿐만 아니라 군부 정치개입으로 국가가 경제와 시민사회를 강력하게 통제하는 사회구조가 형성되었으며, 이러한 결과는 한국의 정치발전과 민주화를 저해시키게 된 것이다. 한국에서의 현상유지를 선호하는 경향을 보이고 있는 미국은 한국군부의 정치개입에 대해 처음에는 방관자적인 입장을 취하다가 후에는 이에 대한 지지로 나아가는 공통점을 보이고 있다. 그러나 박정희 군부의 개입 당시에 미국은 처음에는 반대 입장을 명확히 표명하고 쿠데타군 진압계획까지 수립하고 이를 시도한 후에 지지로 입장을 선회하였으나, 전두환 군부의 경우에는 의외로 신중하고 냉정하게 입장표명을 하지 않고 오히려 미국의 불개입을 거듭 천명하였다는 차이점을 보이고 있다.
GMP 공정용 3 cavity 유리 렌즈 금형의 열변형에 관한 연구
장성호,허영무,신광호,정태성,Chang, Sung-Ho,Heo, Young-Moo,Shin, Gwang-Ho,Jung, Tae-Sung 한국금형공학회 2008 한국금형공학회지 Vol.2 No.6
Recently, the demands of digital camera and miniature camera module for mobile-phone is increased significantly. Lenses which is the core component of optical products are made by the injection molding(plastic lens) or GMP(glass lens). Plastic lens is not enough to improve the resolution and performance of optic parts. Therefore, the requirement of glass lens is increased because it is possible to ensure the high performance and resolution. In this paper, the thermal stress analysis of 3 cavity GMP mold for molding glass lens was performed for estimating the thermal stress and amount of deformation. Finally, the modification plan based on the analysis results was deducted.
Screening of metabolite-producing bacteria in microfluidic static droplet array
장성호,이병진,이창수,정규열 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
High-throughput screening is important for combinatorial metabolic engineering to efficiently investigate vast phenotypic diversity. However, current methods place constraints on monitoring of the intracellular concentration of diverse target products at single cell level. Here, we establish a high-throughput screening platform for metabolite production based on microfluidic static droplet array (SDA) and artificial riboswitch. In this system, a genetically encoded riboswitch enables the measurement of the intracellular metabolite concentration through fluorescence. Then, single cells of a library are individually entrapped in SDA to detect and collect highly productive variants. Using this approach, we analyzed L-tryptophan concentrations of Escherichia coli cells. A mutant E. coli library was screened for improved L-tryptophan production and superior strains were obtained exhibiting up to 145% productivity compared to their parental strain.