• Journal of Industrial Technology
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• v.31 no.A
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• pp.33-38
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• 2011

In an express tilting train, side wall insulating the noise from the exterior sound source consists of two parts. One is the layered composite panel including aluminum honeycomb, glass wool and nomex honeycomb. The other is the double glazed window. In this study, sound insulation performance of the two parts is investigated by mass law and experiment. Based on ASTM E2249-02, the intensity sound transmission loss (TL) is measured on the specimens of the two parts. Mass law deviation (MLD) is considered in order to compare the sound insulation performance in respect of weight. Contribution of each part to the sound insulation is analyzed and the sound insulation strategy for the interior noise reduction is investigated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1484-1488
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• 2009

This thesis is about Heat-sink design which is considered as the biggest problems for commercialization of LED lighting and suggests how to solve the problems though analysis on heat-sink using COMSOL. The temperature difference after simulation value and modelling was $10^{\circ}C$by Transient analysis of Heat Transfer Module which is in the COMSOL Multiphysics. The result approximated the object which is close to actual lighting, when various elements are used according to temperature change of interior and exterior surroundings LED lighting is set up.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2006.11a
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• pp.456-461
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• 2006

The purpose of this study is to systematically analyze empirical studies on community facilities of apartment in Korea, to find out research streaming and understand social backgrounds. Since the last year when well-being trend was highly interesting, consumers have showed their concern about not only just interior of house but also exterior environment of their houses. This movement has evoked consumers' interests in level and sort of resident's community space. For this study, content analysis was conducted. Article of three registered academic institute published from 1986 to 2006 were units of analysis. Using keyword through library database systems, the articles were systematically selected. 20 cases were used for data analysis. For this study, content analysis was conducted.

• Journal of Physiology & Pathology in Korean Medicine
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• v.17 no.6
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• pp.1409-1411
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• 2003

The indirect carbonization without solvent for the extraction of the natural undiluted solution has been studied. The following results have been obtained. 1. The traditional wood undiluted solution distillation can be embodied with the indirect carbonization without solvent of the airtight space. The system of the indirect carbonization without solvent is the indirect dry distillation apparatus. It is composed of the high-temperature stove, the exterior can, material bag, interior can, collect water can and air-fan.

• Proceedings of the KSR Conference
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• 2000.11a
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• pp.521-526
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• 2000

Experimental study is conducted to clarify pressure variation of the passenger cabin of conventional train. These pressure variation may give rise to the ear-discomfort. Generally ear-discomfort has been considered as a problem related to high speed train. Because there is also a good progress to speed-up for conventional line, this isn't only a phenomena related to high speed train any longer. In this study, tile pressure variation of interior, gangway and exterior of saemaeul passenger car is measured using the atmospheric pressure sensors in Honam line. From the results of experiment, the pressure variation per second almost close in upon the limitation in the case of Noryong tunnel. Therefore, to accomplish speed-up for conventional train, it may be necessary to study a serial ventilating and the airtightness of carbody.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.41 no.1
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• pp.89-94
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• 1992

In this paper, the static limit of Helmholtz equation is discussed for the analysis of wave scattering in a wave scattering in a waveguide. Boundary integral equation method is used to formulato the scattering process in the exterior of the scatterer and finite element method in the interior of the scatterer. And hybrid ray-mode method is used to provide the Green's function in the waveguide. The proposed algorithm is applied algarithm is applied to a sample problem with arbitrary scatterer in a waveguide. The results are compared with those of static analysis.

• Proceedings of the KIEE Conference
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• summer
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• pp.1061-1063
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• 2004

This paper deals with the application of cylindrical Halbach array to a PM motor capable of producing pure rotary motion, pure linear motion, or helical motion, The proposed motor consists of an exterior polar Halbach array for a rotary motion and interior cylindrical Halbach array for a linear one. The two- dimensional space harmonic method is employed for predicting the electromagnetic characteristics, with reference to the following parameters as variables: magnetic field, torque/thrust and back emf.

• CDE review
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• v.2 no.1
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• pp.26-32
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• 1996

신규 차종의 개발시 차량의 exterior/interior의 design concept은 운전석주변의 driving package layout을 어떻게 구성하느냐에 따라 좌우되는 경향이 있다. 그것은 user가 그 차량의 선악의 판단함에 있어서 운전석 주변의 design 및 상품성이 큰 요인으로 작용하여 운전석 주변의 부품과 인간과의 적절한 조화를 이루어야 차량의 concept와 일치하는 최적의 design으로 user의 감성을 얻을 수 있는 것이다. 따라서 본 고에서는 신규 차종의 초기 개발 단계에서 최적의 design 및 상품성을 얻기 위한 보다 효과적인 driving package layout을 설정하기 위해 1차적 3차원 인체모형(3DM, 3-Dimensional Manikin)을 구성하고자 한다. 3DM은 human engineering에 의한 인체 치수와 각 관절의 운동방향 및 범위를 이용하여 인체의 동적 해석을 model을 도상 구현하고 이러한 3DM을 활용하여 조작성, 편의성 등의 package layout을 가시화 해 보고자 한다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2006.11a
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• pp.415-418
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• 2006

하이브리드 추진제는 연소 중 연료의 후퇴율 및 연소 면적의 변화로 인해 O/F비가 변화하므로 이로 인해 설계 및 해석에 어려움을 가지게 된다. 본 연구에서는 요구임무를 만족하는 하이브리드 로켓모터에 대한 설계를 수행하였다. 하이브리드 모터의 기초 설계를 실시하고 그 결과를 이용하여, 일정한 산화제 유량이 공급된다는 가정 하에, 연소 시 연소면적변화에 따른 O/F비 변화를 고려한 하이브리드 모터의 내탄도 해석을 실시하였으며, 그 결과를 이용하여 로켓의 외탄도 해석을 실시하였다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2006.11a
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• pp.1-4
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• 2006

Because do placing joint after smallest $1{\sim}3$ day about concrete that is placed beforehand in field, it is difficult that remove laitance happening harden concrete. This laitance happens a problem of bond properties, deterioration in strength. In this research got following conclusion as result that do research about bond properties the way of disposal placing joint. Air Jet is loft interior and exterior. Water Jet appeared that laitance Removal Capacity is superior to dimension within 5%. Deterioration in strength is measured 37% by splitting tensile strength test result by laitance. Deterioration in strength by laitance do more than 30% that removal of laitance is predicted must consist necessarily at concrete horizontality placing joint stroke.