• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.154-157
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• 2005

The use of electron-beam(E-Beam) manufacture systems provides a means to alleviate optic exposure equipment's problems. We designed an E-beam manufacture system with SEM function. Optimal beam scanning is one of the most important conditions in the performance of E-beam and SEM. The performance of E-beam manufacture system and images of SEM are a close affinity with each other. Developed E-beam manufacture system consist of the controllers of high voltage, scanning, optic and high voltage generator. In this paper, we analyze the condition of steady beam scanning and describe the development of controller fer optimal beam scanning.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술대회 논문집 전문대학교육위원
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• pp.83-86
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• 2003

In this paper, arbitrary pulse power for electro chemical etching, which manufactures the groove of fluid dynamic bearing and aero dynamic bearing, is presented. For high precision manufacture, we generally use high precision CNC machine. However, this case has the disadvantage that cost is very expensive and bur due to bites of tool can be generated. So most of companies are interested in the method of electro chemical etching. But for more precision results, it is important to decision the parameters of electrical conditions, such as currents and frequency. We designed and made the arbitrary pulse power system easy to input the parameters for optimal conditions. Experimental results show the effectiveness of the system strategy proposed for the high precision manufacture.

• 한국수산과학회지
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• 제45권6호
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• pp.640-647
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• 2012

Squid Sikhae is a traditional salt-fermented food in Korea. We evaluated the standardization of optimal processing conditions for desirable quality-controlled squid Sikhae using analyses of physiochemical properties, microbiological species, and organoleptic tests. The optimal fermentation temperature, sun-dried sea salt concentration, and fermentation period for manufacturing squid Sikhae products of the aceeptable quality were $10^{\circ}C$, 4%, and 6 days. In addition, optimal concentrations of the additional ingredients of red pepper powder and crushed garlic for acceptable quality squid Sikhae were both 6%.

• 전자공학회논문지A
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• 제31A권3호
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• pp.77-86
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• 1994

A New environment SENSATION for circuit optimization and statistical analysis has been developed. It provides real time simulation and includes automatic algorithms to assist for reaching optimal solution. Furthermore, statistical analysis environment is presented which aids in Monte Carlo analysis. worst case corner analysis, and sensitivity analysis. These capabilities faciliate the characterization of the effects of several operating conditions and manufacture process paramenters on the design performances. We verify that the proposed methods can obtain the optimal solution of the objective function through several experimental results.

• Design & Manufacturing
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• 제16권4호
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• pp.17-23
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• 2022

Recently, several studies are being conducted to achieve a curvature of 180° or more for the edge of the display glass. The thermocompression molding process is applied to the manufacture of curved glass, and high hardness G5 graphite is used as the mold material to withstand the impact applied to the mold. G5 graphite has high hardness and strong brittleness, which makes tool wear and surface damage easy during machining. Therefore, the demand for diamond-coated tools with good mechanical properties is increasing in the G5 machining field. In this study, the optimal cutting conditions and machinability of a nanodiamond (NCD) coated ball end mill being developed by a tool manufacturer were analyzed and evaluated. For this purpose, the same test was performed on the microdiamond (MCD) coated ball end mill and compared together. In summary, the machinability of MCD and NCD coated tools showed better cutting performance at a cutting speed of 282 m/min, a feed rate of 1,400 mm/min, and a radial depth of cut of 0.08 to 0.1 mm.

• 소성∙가공
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• 제24권5호
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• pp.332-339
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• 2015

In the current paper, a cold forging sequence was developed to manufacture a precisely cold forged H/Lower, which is used as the air back unit in commercial automobiles. The preform shape of the H/Lower influences the dimensional accuracy and stiffness of the final product. The shape factor (SF) ratio and shape of the tools are considered as the design parameters to achieve adequate backward extrusion height and maintain appropriate thickness variations. The optimal conditions of the design parameters were determined by using an artificial neural network (ANN). To experimentally verify the optimal preform and tool shapes, the experiments of the backward extrusion of the H/Lower were executed. The process design methodology proposed in the current paper, can provide a more systematic and economically feasible means for designing the preform and tool shapes for cold forging.

• Applied Biological Chemistry
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• 제51권1호
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• pp.24-37
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• 2008

산머루 발효주 제조를 위하여 산머루에 자생하고 있는 발효력이 우수한 효모를 분리 선별하였다. 최종 선별된 균주는 산머루에서 분리한 SMR-3이 알코올 발효력이 우수하고 산도, 잔당, 유기산 함량 및 fusel oil 등의 함량이 낮아 품질면에서 다른 균주로 발효한 산머루주보다 우수하였다. SMR-3을 이용하여 산머루주 제조 최적화를 위한 반응표면 분석결과 알코올 함량이 가장 높은 배양조건으로 온도 $21.91^{\circ}C$, 당함량 $21.48^{\circ}brix$, 발효시간 14.65일의 조건에서 알코올 함량 10.61%가 예상되었고, 잔당함량은 $24.48^{\circ}C$, $12.78^{\circ}brix$, 발효시간 9.02일의 조건에서 최소값을 나타내었다. 관능평가의 결과 발효온도 $20.23^{\circ}C$, 초기당도 $25.30^{\circ}brix$, 발효시간 5.94일에서 최대값을 나타내었다. 알코올 중 ethyl alcohol이 대부분이었고, fusel oil은 거의 검출되지 않아서 산머루주의 품질이 우수한 것으로 판단된다. 각 변수에 대한 회귀식을 도출하여 인자별 산머루주의 알코올 함량, fusel oil, ethyl alcohol 함량 및 전반적인 기호도에 대한 최적 발효조건을 superimposing한 결과 발효온도 $24{\sim}28^{\circ}C$, 초기당도 $20{\sim}24^{\circ}brix$ 및 발효시간 $12{\sim}14$일의 범위로 각각 예측되었다.

• 한국기계가공학회지
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• 제10권3호
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• pp.19-27
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• 2011

A weaving machine for texture industry uses a lot of needles and the nib of these needles is necessary to be kept with sharp edge. The re-grinding of the needle by a special purpose of the grinding wheel can be selected for achieving this aim. This study focused on the manufacture and performance assessment the special grinding wheel. A forming mold for the grinding wheel was designed and a sintering process for furnace process control was established. Manufactured wheels were tested for determining suitable grade of the wheel. The selection of optimal grinding conditions was achieved by a response surface method and a genetic algorithm.

• 한국기계가공학회지
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• 제10권6호
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• pp.109-114
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• 2011

Manufacturing process of plugs is firstly performed in the making of FRP yacht so it is an essential process for making original form. In the developed countries, it has been useful to manufacture structures of streamlined forms or complex forms, which have been difficult to manufacture due to limits of the traditional hand-made technology, by introducing 5-axis machining technology. In this study, the factors that affect most in the machining were found by using Taguchi Method in order to select the optimized machining conditions for 5-axis machines, and the ways to improve the surface roughness of machined products by applying those factors.

• 한국자동차공학회논문집
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• 제12권1호
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• pp.184-189
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• 2004

In this paper, the warm forging process sequence has been determined to manufacture the warm forged product for the precision bevel gear used as the differential gear unit of a commercial automobile. The preform shape of bevel gear influences the dimensional accuracy and stiffness of final product. The aspect ratio and chamfer length are considered as design parameters to achieve adequate metal distribution in the finish forging operation. Then the optimal conditions of design parameters have been selected by artificial neural network (ANN). Finally, to verify the optimal preform shape, the experiments of the warm forging of the bevel gear have been executed. The proposed method can give more systematic and economically feasible means for designing the preform shape in metal forming process.