• 한국정밀공학회지
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• 제26권3호
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• pp.113-121
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• 2009

Behavior of a package of a microwave oven under the clamping condition is evaluated by tests and the finite element analyses. PAM-CRASH software is used for the finite element analyses. Results of the analyses are compared with those of the tests and accuracy is shown to be favorable. Under the clamping condition of the original design, severe deformation occurs and an improved design of the outer case and upper EPS(Expandable Poly Styrene) is proposed to reduce it. Face beads of the outer case are introduced and shape of the upper EPS is modified to reduce the deformation resulting from the clamping load. The improved design model is analyzed and its deformation is shown to be satisfactory. A prototype is produced according to the improved design and tests are performed. Results of the clamping test of the prototype show that the plastic deformation is removed totally.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 추계학술대회 논문집
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• pp.135-138
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• 2001

In order to solve the problem of system efficiency reduced on account of two stage power conversion, we propose a series resonant full bridge inverter circuit for battery-fed microwave oven. This circuit has both a compact size and a light weight. Also, a frequency control adjusts power levels of the microwave oven. Operational principles are explained in detail. A proto-type inverter circuit with 1[kW] power consumption is built and tested for verifying the operation.

• 한국정밀공학회지
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• 제22권7호
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• pp.177-184
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• 2005

Recently, the engineering designer of injection mould has become more and more dependent on the CAE. In the design factors of injection mould, the shrinkage rate should be considered as one of the important performances to produce the reliable products. therefore the shrinkage rate can be mostly calculated by the MoldFlow and Pro-engineering. in the design process. However it is not easy to predict the shrinkage rate of a plastic injection mold in its design process because the analysis can take minutes to hours, the high computational costs of performing the analysis limit their use in design optimization. In this study, the surrogate models, DACE model, based on the Kriging in order to optimize the shrinkage rate of electric microwave oven window is used in lieu of the original models, facilitating design optimization.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.205-207
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• 2001

In response to this inverter microwave oven has been developed to improve high speed cooking time & energy saving performance. The voltage resonating inverter has a defect in switching element that works at 5 or 6times higher than input voltage. Especially, it is very difficult to choose the switching device is very high for the 220 (V) commercial voltage. In this paper, it is proposed the optimum method to realize the turbo 1200(W) output power for microwave oven that is employed the 900(V) IGBT with decreasing operating voltage of the switching component by making the 220(V), 1000(W) inverter through the active clamp voltage resonating inverter.

• 미생물학회지
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• 제18권3호
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• pp.148-152
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• 1980

The microwave of 2450 MHz, generated by a household cooking oven, was evaluated for its applicability to melt various rehydrated media and to remove dissolved oxygen from tubed media for anaerobic culture. The effect on the sterilization of E. coli in selective media was also evaluated. The following results were obtained. 10 The microwave oven was useful in saving time for melting media and in eliminating heat and combustion gas from the laboratory, which were inevitable by-products in the conventional flame method. 2) Dissolved oxygen could be removed without boiling over by exposing the tubes of anaerobic culture medium after putting them in a wire basket in a beaker with water. 30 The count of E. coli during the melting of MacConkey and EMB agar were similar to those treated with open flame. The microwave treatment was not considered a possible mean to replace autoclaving even in these selective media.

• 자원리싸이클링
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• 제2권4호
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• pp.10-16
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• 1993

마이크로파 가열 공정에 의하여 스테인레스강 제조시의 발생하는 분진의 환원거동올 환원제로서 코크스와 목탄을 이용하여 조사하였다. 원래 상태의 펠릿 분진과 환원제로서, 펠릿을 만든 분진을 마이크로파 가열오븐 내에서 $1000^{\circ}C$까지 가열하여 환원시켰다. 코크스에 비하여 목탄의 경우가 더 높은 환원율율을 나타내었다. 마이크로파 오븐에서 500W와 700W의 사용한 경우 유사한 환원율을 나타냈으며 200분 이내에 급속하게 환원되였다. 환원정도는 Fe>Ni>Cr로 감소되었다.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 춘계학술발표논문집
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• pp.882-884
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• 2009

본 연구는 주형의 형상에 관계없이 균일한 건조성능을 가지는 장치의 도입을 목적으로 Microwave를 이용한 주형건조장치 개발을 위한 기초 연구에 관한 것이다. 건조 성능의 검토를 위해 진공건조기와 Lab-scale의 Microwave 출력장치를 가지는 Microwave oven을 이용하여 주물사의 무게별, 건조시간별 건조효율을 검토하였으며, $CO_2$주형법에서 물유리의 양과 $CO_2$통기시간에 따른 주형의 압축강도를 측정하였다.

• 한국식품조리과학회지
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• 제14권2호
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• pp.182-187
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• 1998

일반적으로 가정에서 고구마 조리에 가장 많이 사용하는 방법인 전자렌지, 가스오븐렌지 및 증자에 의해 조리과정 중 고구마의 중량, 환원당의 양, 당의 조성 및 효소의 활성 변화를 측정하였다. 조리과정 중의 중량변화는 전자렌지와 가스오븐렌지를 이용하여 조리하였을 때 수분의 증발이 일어나 중량이 감소되는 경향을 보인 반면, 증자의 경우에는 중량이 증가되는 경향을 보였다. 환원당의 함량은 전자렌지를 이용하여 조리한 경우 조리과정 중 환원당의 양이 증가하다가 감소하는 경향을 보였으며, 가스오븐렌지와 증자 시 환원당의 양이 증가되는 경향을보여, 중심부지 온도가 10$0^{\circ}C$일 때 334.60 mg/g과 381.29 mg/g으로 상당히 많은 양의 환원당이 생성되었다. 조리시 당의 성분변화는 가열전 fructose, glucose, surose는 각각 1.56 mg/g, 1.79 mg/g, 5.58 mg/g의 함량을 보였으나, 조리과정 중 fructose, glucose, surose는 조리전에 비해 감소되는 경향을 보였다. 반면 조리전 2.22 mg/g의 함량을 보인 maltose는 조리가 진행될수록 증가하여 전자렌지에서 60초 조리하였을 때 9.01 mg/g, 가스오븐렌지 에서 중심온도가 10$0^{\circ}C$일 때 24.81 mg/g, 증자시 중심온도가 10$0^{\circ}C$일 때 28.10 mg/g으로 증가하였다. 조리과정 중의 $\beta$-amylase의 활성은 조리과정이 진행될수록 감소되는 경향을 보였다. 특히 열전도율이 높은 증자에 의한 조리시 전자렌지나 가스오븐렌지에 비해 효소의 활성이 급격히 감소되는 경향을 보였다. 또한 invertase의 효소활성 역시 조리가 진행될수록 감소되는 경향을 보였다 가스오븐렌지와 증자에 의해 중심온도가 7$0^{\circ}C$와 8$0^{\circ}C$에 도달하였을 때 56.8 unit, 3.2 unit와 65.7 unit와 13.3 unit의 잔존활성을 보였으나 중심온도가 9$0^{\circ}C$와 10$0^{\circ}C$일 때 잔존활성은 측정되지 않았다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 전력전자학술대회 논문집
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• pp.584-588
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• 2001

A conventional power supply to drive a microwave oven has ferro-resonant transformer and high voltage Capacitor(HVC). Though it is simple, transformer is bulky, heavy and has low-efficiency. To improve this defect a high frequency inverter type power supply has been investigated and developed in recent years. But, because of additional control circuit and switching device, inverter-type power supply is more expensive than conventional one. In this study, A new pulse power supply for Microwave Oven using novel HVC embedded high frequency transformer is proposed for down-sizing, cost reduction, and efficiency emprovement of Inverter type power supply. Also, equivalent circuit model is derived by impedance measurements. And the operation of proposed pulse power supply is verified by simulations and experimental results.

• 한국세라믹학회지
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• 제32권8호
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• pp.865-872
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• 1995

Ultra-fine $\beta$-SiC powders were fabricated by self-propagating high temperature synthesis process (SHS) using microwave oven. The flexural strength, fracture toughness, and hardness of hot pressed sample at 200$0^{\circ}C$ for 60 min using synthesized SiC powders, which had 2 wt% of Al2O3 and 2.5 wt% of B4C content, showed 438 MPa, 4.15MPa.m1/2 and 28 GPa, respectively. The highest strength, fracture toughness, and hardness of composites containing 4wt% of Al2O3, which had highest relative density of 99.9%, showed 458 MPa, 4.6MPa.m1/2 and 36.2 GPa, respectively.