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강홍석,남관우,소순용,오근환 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
In polymer electrolyte membrane fuel cell, the poor power performance of hydrocarbon (HC)-basedmembranes in low relative humidity conditions arises from the materials’ inherently inadequateproton conductivity under water-deficient conditions. In this study, we introduce boehmite into thecatalyst layer as a water retention material to enhance the power performance of a HC-basedmembrane/electrode assembly (MEA) in low RH conditions. The addition of well-dispersed boehmiteinto the CCL increased the water concentration and consequently accelerated water back diffusion tothe MEA at a low RH. The power performance also improved upon the addition of an optimal percentcontent of boehmite.
Silica-Perfluorinated Polymer Composite Nanoparticles for Superhydrophobic Surfaces
강홍석,범정철,정대환,하종욱,이수복,손은호,박인준 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Herein, we report a simple technique to fabricate robust and efficient superhydrophobic surfaces by spray coating silica-core/perfluorinated polymer-shell composite nanoparticles (silica@PFA NPs) onto the adhesive-coated surface. The novel silica@PFA NPs were prepared by covalently attaching perfluoroalkyl acrylate on the surface of the silica nanoparticles. The fluorinated shell thickness in the silica@PFA NPs could be easily controlled by varying the degree of polymerization and the NPs underwent spontaneous assembly to form complex micro/nano dual scale roughness after spray coating. In addition, we introduced an epoxy adhesive layer in between the NPs and the substrate, which led to a high mechanical robustness of the surface from external damages. Thus, outstanding superhydrophobic performance and mechanical stability could be achieved simultaneously and in a simple manner.
姜弘錫,李善淑,金昌均,許俊 高麗大學校 倂設 保健大學 保健科學硏究所 1981 保健科學論集 Vol.12 No.1
Authors made an experimental study on the reproduction efficiency and quality control of 10 X-ray equipments in comparision with H.H.S. standards and the results obtained as follows. 1. Eight X-ray equipments were suited to the standards in reproduction efficiency. 2. Three X-ray equipments were suited to the standards at 80 KVP, and all of them was exceeded the standards in accuracy at 60 KVP. 3. In half-value layer, all of the generators was suited to the standards in the limited range. 4. Eight X-ray generators in the tube voltage were accorded with the indicated value on the meter of generator. 5. Most of the X-ray generators were suited to the standards in long exposure time(over O.1 second).
강홍석,( Shu Yang ) 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Membranes with hierarchical architectures, where pores of different sizes are integrated in tandem, are of great interests for water/oil emulsion separation due to potentials for achieving large flux, high selectivity, and mechanical durability. However, it remains challenging to modify the pore size in the nanoscale without sacrificing the flux, thus limiting the size of the oil/water droplets that can be filtered. Here, we electrospin a thin layer of azobenzene polymer (i.e., polydisperse orange 3, PDO 3) fibers on a highly porous supporting layer (i.e., elec-trospun fiber network from polycaprolactone), followed by photoflui-dization of PDO 3 fibers to shrink the pore size from micrometer to nanometer by controlling the light exposure dosage.
흉부(胸部) 고관전압(高管電壓) 촬영조건(撮影條件)에 관(關)한 검토(檢討)
강홍석,김창균,허준,Kang, Hong-Seok,Kim, Chang-Kyun,Huh, Joon 대한방사선과학회 1979 방사선기술과학 Vol.2 No.1
High kilovoltage technique as compared with low kilovoltage in taking chest radiogram has much advantages. Authors performed an experiment by using acryl phantom to make the technical chart at 120KV and obtained the results as follows; 1. Increase and decrease of tube voltage in thickness change was 3.2KV per cm at variable technic chart. 2. At fixed kilovoltage technic chart, increase and decrease was $0.12{\sim}0.2$ mAs per cm in chest thickness. 3. Increase and decrease of distance was 1.3inches per cm in thicknese change