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정명주,손태문,박형숙 慶星大學校 1998 論文集 Vol.19 No.2
The microbial activity of P3-luboklar FC,FC-A,FC-A(XT)DX and DXB was compared by DGHM Germ Carrier Test method. The following results were obtained. 1. FC,KB and KC has shown to be effective against all strains within 10 minutes. 2. FC-A was effective against E. coli, immediately, and kill could be achieved against Pseudomonas aeruginosa and Staphylococcus aureus within 4 minutes and 16 minutes, respectively. 3. DXB was effective against all strains within 10 minutes with the exeption of B. subtilis. 4. FC-A(XT) was the most effective against B. subtilis.
SM20C 旋削時 加工條件 變化에 따른 칩 形狀에 관한 硏究
정태상,황광성,김명규,김길진,박영태 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14
This study was to look for cutting conditions which are safe, comfortable and contributable to the increase in productivity at the time in turning. The shape of chips while turning have a strong effect on cutting processing. If chips fail to be well controlled, systematic cutting is not possible by revolution of chips entangled with workpiece or damage of tool edges, and this causes problems threatening the safety of the operator. This study is designed to identify conditions which chips effectively controlled and able to treat properly, and the results are as follows: 1. Feed rate, which determined the shape of chips, was found to have a stronger impact on the shape of resulting chips than any other cutting condition. 2. When feed rate was 0.25mm or over, controlled chips(coil spring type) were produced under whatever cutting conditions. 3. When feed rate was 0.25mm or over and depth of cut was 1.0mm, well-controlled shorter coil type chips were produced at every spindle speed, which implied they were the most suitable cutting conditions. 4. Feed rate 0.2mm was found to be an unstable section where coil spring and linear mixed type chips were produced together, and as feed rate decreased, more linear chips beyond control were produced. 5. At the same spindle speed, as the diameter of the material became bigger, controlled chips were produced only when the depth of cut was reduced, and vice versa under feed rate 0.2mm. 6. At the same feed rate, the lower spindle speed was, the more stable chips were produced.
김명규,황광성,정태상 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14
The purpose of this study was to design and develop a creeper for can-manufacturing that is simple for farmers to operate, light-weighted, endurable, mobile and not space-restricted. Specifically speaking, the most optimal conditions including the most appropriate number of blades and the most optimal power levels were experimentally investigated to design a portable creeper with a built-in compressor. The results of this study are as follows: 1. Circular grooves were cut on the cylinder axle itself to allow air pressure be carried to the blades, so that complicated links were removed easier and successive working was achieved. 2. The most appropriate number of blades for honeybee work was found to be 16 and circular blades were the most efficient. 3. The most appropriate power level for honeybee work was 700kg and the most appropriate out-length of the blades was found to be less than 2mm with scratches minimized.
황광성,김명규,정태상 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14
Air pressure Vane motor applied in this paper can be used very widely. Motor developed in domestic has about 80% efficiency of income product. Therefore, torque is increased because improve small size(1200rpm) Low-speed High torque type Air pressure Vane motor's quality of the material and special quality and do so that decelerate output and conclusion that consider and manufacture number of rotations and efficiency etc. Obtained results are summarized as follows: 1. Dust and corrosion can be reduced and 20% bulk of casing housing decreased by optimizing of alternated casing site. 2. Vane's wing optimum number is composed of 5 by Vane type wing and Gear Ratio's design choice and torque raised by eccentricity 28mm of rotor and cylinder and reduction of rpm (gear ratio 1/2.6). 3. Air pressure Vane motor's research and development connected with various output is judged that it is serious as for counter measure late.
김전하,강명창,김정석,나승표,김기태 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
The high hardened materials that are remarkable in aspects of durability have been used for die and mold industry. As the high hardened materials are hard to machine, the high-speed machining is essential to manufacture these materials. Currently, in the general turning and milling, experiments to the tool wear monitoring have studied, but those have not applied in high-speed machining. In this study, the cutting mechanism was analysed by the cutting force according to cutting conditions, and the parameters to monitor the tool wear were selected from the tendency of the cutting force and acceleration according to cutting length in the high-speed machining of the high hardened materials(STD11).
Green Manufacturing Process for Helical Pinion Gear Using Cold Extrusion Process
Jeong, Myeong-Sik,Lee, Sang-Kon,Yun, Jeong-Hwan,Sung, Ji Hyun,Kim, Da Hye,Lee, Shinok,Choi, Tae-Hoon Korean Society for Precision Engineering 2013 International Journal of Precision Engineering and Vol.14 No.6
In this research, a cold extrusion process that can replace conventional machining process is developed for sustainable production. The cold extrusion method requires an analytical design process to assure desired dimensional accuracy of the final product. Therefore, the design must consider the material flow during the process in order to avoid product defects such as folding and underfilling. The forming load and material flow were analyzed using a commercial finite element code, DEFORM3D. To improve the dimensional accuracy, the shape of die and initial billet were designed using minimum distance analysis via FE simulation. Also the developed process included ejection for improving dimensional accuracy, and it was verified by a gear accuracy test. Isothermal annealing and spheroidizing were applied for increasing the formability of high strength workpiece. Finally a helical pinion gear was manufactured using the developed process and the product was compared to the simulation results. In conclusion, the developed process is a scrap reducing and energy saving method for manufacturing extrusion product with high dimensional accuracy.
Jeong Myeong Kim,An-Sung Roh,Seung-Chul Choi,Eun-Jeong Kim,Moon-Tae Choi,Byung-Koo Ahn,Sun-Kuk Kim,Young-Han Lee,Jae-Ho Joa,Seong-Soo Kang,Shin Ae Lee,Jae-Hyung Ahn,Jaekyeong Song,Hang-Yeon Weon 한국미생물학회 2016 The journal of microbiology Vol.54 No.12
Soil microorganisms play an essential role in soil ecosystem processes such as organic matter decomposition, nutrient cycling, and plant nutrient availability. The land use for greenhouse cultivation has been increasing continuously, which involves an intensive input of agricultural materials to enhance productivity; however, relatively little is known about bacterial communities in greenhouse soils. To assess the effects of environmental factors on the soil bacterial diversity and community composition, a total of 187 greenhouse soil samples collected across Korea were subjected to bacterial 16S rRNA gene pyrosequencing analysis. A total of 11,865 operational taxonomic units at a 97% similarity cutoff level were detected from 847,560 sequences. Among nine soil factors evaluated; pH, electrical conductivity (EC), exchangeable cations (Ca2+, Mg2+, Na+, and K+), available P2O5, organic matter, and NO3-N, soil pH was most strongly correlated with bacterial richness (polynomial regression, pH: R2 = 0.1683, P < 0.001) and diversity (pH: R2 = 0.1765, P < 0.001). Community dissimilarities (Bray-Curtis distance) were positively correlated with Euclidean distance for pH and EC (Mantel test, pH: r = 0.2672, P < 0.001; EC: r = 0.1473, P < 0.001). Among dominant phyla (> 1%), the relative abundances of Proteobacteria, Gemmatimonadetes, Acidobacteria, Bacteroidetes, Chloroflexi, and Planctomycetes were also more strongly correlated with pH and EC values, compared with other soil cation contents, such as Ca2+, Mg2+, Na+, and K+. Our results suggest that, despite the heterogeneity of various environmental variables, the bacterial communities of the intensively cultivated greenhouse soils were particularly influenced by soil pH and EC. These findings therefore shed light on the soil microbial ecology of greenhouse cultivation, which should be helpful for devising effective management strategies to enhance soil microbial diversity and improving crop productivity.