• 월간산업보건
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• s.21
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• pp.29-45
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• 1989

• 월간산업보건
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• s.19
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• pp.28-39
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• 1989

• 월간산업보건
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• s.12
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• pp.26-38
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• 1989

• 월간산업보건
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• s.14
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• pp.34-43
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• 1989

• 유체기계공업학회:학술대회논문집
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• 2002.12a
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• pp.123-128
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• 2002

Over the range(OTR) has been applied for cooking and ventilation functions especially in northern Amarica. Because flow rate and operating rpm of the double sided sirocco fan for ventilation are much higher and than the microwave oven system, the major noise source is the sirocco fm. Recently, the quiet fan development is one of very important issues for amenity. In this study, the noise source identification using multi-microphone array system was carefully carried out and numerical simulations for understanding the aerodynamic and aeroacoustic of the fan were peformed. The sound level of tonal noise is predicted with a good accuracy but that of the broadband shows some discrepancy. In order to reduce the broadband noise, the inlet region of sirocco fan have to be modified that the secondary flow should be suppressed. Based on these results, new low noise fan and OTR is now developing.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.11a
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• pp.476-479
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• 2007

Kitchen hood was used exhausting contaminants and heat during cook. But many people do not use it easily because of the noise. Therefore this study was measured the noise when kitchen hood was working according to air flow mode. Because there are no measuring and analyzing standards in the setting house, it was referred to KS C 9304(Korean Standard). The result was shown the higher sound level than 45dB. Also it was compared the air flow that measured in the house and specified the brochure during the operation of the hood.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.14 no.5
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• pp.96-101
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• 2015

This study regards distributions of flow in the ventilation system used in the kitchen hood in a ship. In this study, for describing the flow in the ventilation system, three-dimensional steady-state turbulence was assumed for the governing equation. When the plume was formed, three gases, CO, CO2, and HCL, in the flow field of the hood were considered as the plume, and it was assumed that the sum of concentrations of the gases was 100%. As a result, it could be confirmed that the plume was smoothly discharged when the flow rate of the supply was ten times lower than that of the exhaust.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.16 no.1
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• pp.69-74
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• 2007

Topology optimization of the inner reinforcement for a vehicle's hood has been performed by evolutionary structural optimization(ESO) using a smoothing scheme. The purpose of this study is to obtain optimal topology of the inner reinforcement for a vehicle's hood considering the static stiffness of bending and torsion simultaneously. To do this, the multiobjective optimization technique was implemented. Optimal topologies were obtained by the ESO method. From several combinations of weighting factors, a Pareto-optimal solution was obtained. Also, a smoothing scheme was implemented to suppress the checkerboard pattern in the procedure of topology optimization. It is concluded that ESO method with a smoothing scheme is effectively applied to topology optimization of the inner reinforcement of a vehicle's hood considering the static stiffness of bending and torsion.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.22 no.2
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• pp.304-309
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• 2013

In chemical, medical or biology laboratories Fume Hoods are basic facilities which can protect researchers from dangerous gas as blowing the contaminated air outside. After the air inside the laboratory room is sucked into the hume hood, then, it is blew out by a fan rotated by an AC induction motor. In addition, a damper controls the inside opening of a duct, which the air flows through. The face velocity, air velocity through the front door, have to be kept constant as the set value even though the opening of the door is varied. However, conventional fume hood used to be operated by operator's manual switches. So that, in this paper an automatic control system is developed which controls the face velocity by adjusting the rotating speed of the blow motor and the opening of the damper. Experiments show that this developed system can be used at such laboratories.

• Journal of the Korean Society of Costume
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• v.62 no.3
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• pp.1-16
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• 2012

The purpose of this dissertation is to examine the various types of hooded garments that have been worn after the $20^{th}$ century, and to analyze the aesthetic values of them. The study examined various types of hooded garments with diverse significances based on literature and case studies on the history of garments, news paper articles and the Internet. Since the $20^{th}$ century, there has been a variety of hooded garments, such as monk dresses, hoodies, anoraks, duffle coats, some protective clothing, and designers' hooded clothes. Through this research, the study found that the aesthetics of hooded garments after the mid-20th century were as follows: physical protection, anonymity, psychological refuge, fashionability and high-functionality.