• Journal of Electrical Engineering and Technology
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• v.9 no.4
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• pp.1277-1282
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• 2014

Concentrated flux interior permanent magnet (CFIPM) motors have the advantage that their utilization of flux linkage is more efficient than that of general IPM motors and CFIPM motors are suitable for washing machine motors, which demand low-speed, high-torque specifications. However, low efficiency occurs in the low-speed high-torque mode considering the high-speed operation for spin mode. This paper proposes a magnet overhang structure between the rotor core that reduces leakage flux and improves efficiency for a CFIPM in wash mode. Optimization of the 3D design of magnet overhang structures is performed to improve the efficiency with the same quantity of permanent magnets. The validity of the optimal design is experimentally verified through the fabrication of prototypes.

• Journal of Science and Technology Studies
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• v.13 no.2
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• pp.173-206
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• 2013

Launched by Samsung in 2003, nano-silver washing machines were a representative application of nanotechnology in commercial products until the US Environment Protection Agency (EPA) decided to regulate companies that produce nano-silver products in 2006. A year later, however, the EPA reclassified the washing machines not as an application of nanotechnology but as an ion-generating machine. As shown by the EPA's equivocation on this issue, establishing a category for nano-silver material should be considered in the procedure of risk assessment and regulation. This paper analyzes the controversy over Samsung's nano-silver washing machines more in detail to study how the demarcation between silver ion and nano-silver can vary according to the risk perception of nanotechnology. In Korea and the US, the boundary between silver ion and nano-silver was malleable and mobilzed depending on the contexts. Based on an analysis of the recent history of nano-silver washing machines, this paper explores the influence of risk perception over the ontological perspectives on a certain material.

• Journal of the Korean Society of Clothing and Textiles
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• v.30 no.5 s.153
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• pp.753-761
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• 2006

This paper suggests the optimal conditions for the laundry to prevent from the electrostatic charge by the evaluation of the electrostatic characteristics in the full process of washing and drying. Cotton, nylon, and polyester fabrics were used as test washing specimens. Detergent and softener were used under the standard washing cycle, and then the electrostatic characteristics of laundry were measured. The results showed that the moisture regain decreased and the electrostatic charge increased with the drying time. It was observed that the specimen fabrics were already dried up before the standard drying cycle was finished. Consequently, the excessive drying caused a generation of electrostatic charge due to the removal of the trace of moisture remaining and the excessive friction. Especially, the softener played an important role to prevent from a generation of electrostatic charge, whose insertion was more effective in the drying than in the rinsing process. It was also shown that the electrostatic charge could be decreased by drying the fabrics of one kind. On the other hand, for drying the mixed kinds of fabrics, the electrostatic charge increased remarkably. Therefore we suggest that the laundry be classified according to the kinds of fiber, and then be washed and dried before excessive drying to reduce electrostatic charge And further, a proper use of softener is effective to reduce electrostatic charge.

• Korean Journal of Food Science and Technology
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• v.38 no.1
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• pp.28-34
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• 2006

Effects of various surface sterilization and washing methods on sterilization of fresh chicory surface were evaluated. Fresh-cut chicory was washed with tap water for 1 min, 100 ppm chlorinated water, and 3 ppm ozonated water using mechanical washing machine for 3 min, packed with bi-axially oriented polypropylene (OPP 0.04 mm) film, and stored for 3 weeks at 4 and $10^{\circ}C$. Tap water washing resulted in approximately 1 log CFU/g reduction of microbial load, and ozonated water and chlorinated water treatments resulted in additional 2 log CFU/g reduction.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.11a
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• pp.295-296
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• 2008

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.963-964
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• 2011

본 논문에서는 세탁기용 DD모터로 사용되고 있는 BLDC를 대신하여 외전형 Switched Reluctance Motor (SRM) 타입으로 세탁기의 부하에 따라 저속/고토크인 세탁모드, 고속/저토크인 탈수모드의 특징에 만족시키는 전동기를 설계한다. 이와 같은 특징을 고려하여 외전형 SRM의 극 조합을 12/8, 18/12, 30/20, 36/24에 대해 설계하고 FEM을 통해서 특성을 해석한다. 이 중 세탁기용 전동기에 알맞은 구조를 선정하고자한다.

• Journal of Korean Society for Quality Management
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• v.27 no.4
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• pp.42-66
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• 1999

We proposed eight dimensions and their constituents of product advantage in the last issue. In this study, using the dimensions and constituents, gap analyses are conducted on some product categories(; desktop computer, PCS terminal, and washing machine) in order to know what dimensions or constituents are major areas to be improved. For the purpose of strategic use of the dimensions of product advantage, Kano analyses are also applied. Based on the results of the gap analyses and Kano analyses, the future directions of new products development for the selected products are suggested.

• Journal of the KSME
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• v.34 no.6
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• pp.475-481
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• 1994

최근들어 가전회사를 중심으로 카오스 응용제품 개발에 박차를 가하고 있다. 인간의 주관적인 사고방식을 이용한 퍼지와 인간의 학습능력을 모방하는 유럴네트웍, 그리고 무질서속에서도 일 정한 질서를 찾아내고 단기예측이 가능한 카오스이론을 적용한 가전제품이 시장을 주도해나갈 것이다. 아직까지 우리나라에서는 카오스이론에 대한 학문적관심이 부족한 상태이며 일부 관심이 있는 사람에 의해 연구가 진행중인 것으로 알고 있다. 앞으로는 학계와 산업체에서 공동으로 카오스이론 연구와 제품개발에 노력을 해야 할 ㄸ라고 생각한다.

• Proceedings of the Korean Reliability Society Conference
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• 2002.06a
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• pp.253-260
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• 2002

This paper propose Electronic Speckle Pattern Interferometry(ESPI) for reliability evaluation of electronic device. Especially, vibration problem in a fan of air conditioner, motor of washing machine and etc. is important factor to design the devices. However, it is difficult to apply previous method, accelerometer to the devices with lightweight and complex geometry. ESPI, non-contact measurement technique is applied for vibration analysis of a sirocco fan inside air conditioner. Vibration mode shapes, natural frequency and the range of the frequency are decided and compared with that of FEM analysis. In mechanical deign of new product, ESPI is able to supply effective design information.

• Journal of Korean Institute of Fire Investigation
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• v.11 no.1
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• pp.29-62
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• 2007

본 연구는 국내의 가정에서 가장 많이 사용되고 있는 1조식전자동세탁기(이하 기기라 함)의 발화위험요소 중, 그 내부에 부속된 세탁조의 하부측을 경유하며 배선되는 전선(이하 하부배선이라 함)의 발화형태와 성상(性狀)을 조명하므로서, 예방대안과 원인조사의 요령을 구체적으로 제시하고자 하였다.