• 소성∙가공
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• 제3권3호
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• pp.359-374
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• 1994

Process sequence design in sheet metal forming process by the finite element method is investigated. The forming of sheet metal into a washing machine container is used to demonstrate the design of an improved process sequence which has fewer operations. The design procedure makes extensive use of the finite element method which has simulation capabilities of elastic-plastic modeling. A one-stage process to make an initial blank to the final product is simulated to obtain information on metal flow requirements. Loading simulation for a conventional method is also performed to evaluate the design criteria which are uniform thickness distribution around the finished part and maximum punch load within limit of available press capacity. The newly designed sequence has two forming operations and can achieve net-shape manufacturing, while the conventional process sequence has three forming operations. This specific case conventional process sequence has three forming operations. This specific case can be considered for application of the method and for development of the sequence design methodology in general.

• 대한핵의학회지
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• 제14권1호
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• pp.9-16
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• 1980

A 2-site immunoradiometric assay for serum ferritin was evaluated with commercially available kit. The assay required 6 hours. The slope of the standard curve kept up ideal range with the calculation of maxium binding instead of total dose until expire date. The stage II washing was more important than the stage I washing on the modified washing procedure as the bead keeping to remain in the tube. With this modified mothod, three times of tube. washing was sufficient to reduce the significant errors The measured values of serially diluted sample with standard diluting buffer was proportional to the predicted values. In the experiment of serum effect on the assay. a linear relationship from 5 to 50% serum, but beyond 50% there was reduction in measured ferritin concentration. It has a sensitivity of 2.77 ng/ml, within-assay precision (CV) of 8.0%, and between-assay reproducibility(CV) of 7.4% (mean 174.8 ng/ml).

• 한국신뢰성학회지:신뢰성응용연구
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• 제5권1호
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• pp.181-192
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• 2005

In this paper, we consider a process for design for reliability(DFR) in design and development phases. The procedure of GE for DFR is applied to develope and analyze a washing machine with required reliability and the detailed procedure is proposed.

• 한국분말재료학회지
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• 제15권2호
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• pp.125-135
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• 2008

[ $TiO_2$ ] nanotubes for photocatalytic application have been synthesized by hydrothermal method. $TiO_2$ nanotubes are formed by washing process after reaction in alkalic solution. Nanotubes with different morphology have been fabricated by changing NaOH concentration, temperature and time. $TiO_2$ nanoparticles were treated inside NaOH aqueous solution in a Teflon vessel at $110^{\circ}C$ for 20 h, after which they were washed with HCl aqueous solution and deionized water. Nanotube with the most perfect morphology was formed from 0.1 N HCl washing treatment. $TiO_2$ nanotube was also obtained when the precursor was washed with other washing solutions such as $NH_4OH$, NaCl, $K_2SO_4$, and $Na_2SO_3$. Therefore, it was suggested that $Na^+$ ion combined inside the precursor compound slowly comes out from the structure, leaving nanosheet morphology of $TiO_2$ compounds, which in turn become the nanotube in the presence of hydroxyl ion. To stabilize the sheet morphology, the different type of washing treatment solution might be considered such as amine class compounds.

• 한국지하수토양환경학회지:지하수토양환경
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• 제9권1호
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• pp.104-111
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• 2004

비소로 오염된 토양에 대해 토양세척기법을 적용하기 위한 최적의 운전조건을 도출하고자 실험을 수행하였다. 대상시료는 강원도 N광산의 광미와 경상북도 K광산 하류의 밭 토양과 하천퇴적 토양을 선정하였다. 연속추출법 실험 결과, 비소의 총함량은 21,028$\pm$190(광미), 443$\pm$7(밭 토양), 37$\pm$3(하천퇴적 토양)mg/kg으로 존재하였으며, 결합력이 약하고 쉽게 용출 가능한 비소의 농도는 최초 4단계 연속추출에 의한 총량으로 2,284$\pm$100[광미(10.9%)], 151$\pm$5[밭 토양(34.0%)], 15$\pm$3[하천퇴적 토양(39.5%)]mg/kg으로 나타났다. 수산화나트륨을 이용한 시간에 따른 용출 실험 결과, 3가지 토양 모두 적용농도(50, 100 mM)에서 6시간 이후부터 90%이상의 비소 용출 효율을 보였으며, 세척제의 최적농도는 모든 경우에 대해 200 mM이었고 진탕비는 각각 1:10(광미)과 1:5(밭 토양, 하천퇴적 토양)가 최적 조건이었다. 수산화나트륨에 의한 연속 토양세척 실험 결과, 하천퇴적 토양과 밭 토양은 연속 토양세척에 의해 세척된 토양 내의 잔존 비소 농도가 감소함을 알 수 있었으나, 광미의 경우는 거의 큰 변화가 없었다.

• 한국소음진동공학회논문집
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• 제24권8호
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• pp.628-635
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• 2014

The procedure to estimate the sources of noise and vibrations in a typical drum-type washing machine was presented. The sources should be identified to predict the radiated noise with computational model of structure. Source identification techniques based on singular decomposition were implemented using the measured signals of accelerometers and microphones. The finite element analysis and indirect boundary element analysis were implemented to predict the structural vibrations and the acoustic pressures at the field points. The predicted results by only structural sources were compared with those by both structural and acoustical sources. It was verified that not only the structural-borne source but also air-borne source should be considered to predict the radiated noise with better accuracy. The contribution analysis with respect to the transfer path was also preformed.

• 산업경영시스템학회지
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• 제23권61호
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• pp.75-87
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• 2000

This paper proposes a procedure for designing an accelerated test using SMAT(Stress, (failure) Mechanism and Test) model describing the relation among stress, failure mode/mechanism and test method. In SMAT model the stresses to be applied are derived from the environmental factor analysis, the relative importance of those stresses can be estimated using AHP(Analytic Hierarchy Process) and failure mode/mechanism and test method are derived from the fields failure information and FMEA(Failure Mode and Effect Analysis). By applying the procedure we can make a selection of major factors to cause the failure of assembly and design the accelerated test using DOE(Design of Experiments) The procedure is illustrated with an qualification test case study of washing machine shaft assembly in "A" electric appliance company.

• 한국염색가공학회지
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• 제15권1호
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• pp.15-22
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• 2003

Dyeing liquor was extracted from flowers, leaves and stems of balsamine. Dyeing properties, colorfastness and antibacterial activities of the fabrics dyed with the balsamine extracts were investigated at a variety of dyeing conditions of differing pH. time and temperature. Wool, silk and nylon fabrics showed better dyeability than cellulosic fabrics, i.e. cotton, linen and rayon. Especially, nylon fabrics showed the highest K/S values. The dye-uptake was achieved to the highest degree during the first ten minutes of dyeing procedure. All fabrics were dyed well at $40^\circ{C}$ with no pH adjustment. The pH of unadjusted balsamine extracts was 4.6. Their colorfastnesses to washing, drycleaning and perspiration were good as 4 or 4-5 grade. but the light fastnesses were poor as 1-2 grade. While, the antibacterial activities to Staphylococcus aureus and Klebsiella pneumoniae were excellent with 99.9% of colonies reduction ratio. Their excellent antibacterial activity was kept well after ten times washing.

• International Journal of Fluid Machinery and Systems
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• 제1권1호
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• pp.121-139
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• 2008

For mechanical drive steam turbines, the investigation results of corrosion fatigue phenomena in the transient zone are introduced, including basic phenomena on expansion line and actual design and damage experience. These results were analyzed from the standpoint of stress intensity during the start of cracking. In order to resolve such problems, preventive coating and blade design methods against fouling and corrosive environments are developed. Detailed evaluation test results are given for coating performance using a unique test procedure simulating fouling phenomena and washing conditions. Finally, the results of the successful modification of internals and on-line washing results on site are introduced.

• Journal of Microbiology and Biotechnology
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• 제9권3호
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• pp.292-296
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• 1999

The high density mixed mode adsorbent known by the trade name of Mimo-AD was used to purify lysozyme directly from the hen egg white (HEW). The homogenized hen egg white was treated with the adsorbent in a stirred vessel for lysozyme adsorption, and then the adsorbent, easily separated from the HEW by sedimentation, was packed into a column. The remaining HEW and contaminant proteins were removed by washing with pH 11 distilled water in an expanded-bed state, and subsequently the elution was performed with pH 12 distilled water in a packed-bed state. By this simple and rapid adsorption, washing, and elution procedure, lysozyme was purified to＞95％ with an overall recovery yield of 66％. This process offers a great potential for industrial application by allowing the extraction of lysozyme while retaining the commercial value of HEW.