• Proceedings of the KSR Conference
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• 2008.11b
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• pp.269-274
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• 2008

The Seoul subway is acting the center of public transportation after the opening of the first line on August 15, 1974. and the subway line of the DC traction system is running and building to the ninth line. However, the main insulation parts used in overhead contact line are now imported from overseas products. Therefore, this paper considers domestic manufacture technology, supply easiness and economic effectiveness of insulation products and reviews the safety of support insulator used in rigid conductor line, stem insulator used in movable bracket and AC/DC different phase section insulator that localization development is necessary.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.58 no.1
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• pp.62-66
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• 2009

In this paper, A localized electromotion scooter controller for the senior and disabled is developed. Recently, the population which uses the electromotion wheel chair or electromotion scooter is increasing. The reason is that the electromotion wheel chair and electromotion scooter were newly applied in medical treatment grant item. In the whole world, electromotion scooter controller is coming to be produced above a hundred of millions. The products produced are consuming from most Europe and North America. the demand is increasing rapidly in Korea. The electromotion scooter which is sold to domestic is about 40,000 units, and about 70% or more in the products are imported from the foreign nation. Also controller for electromotion scooter uses the foreign nation product. Consequently, as the localized electromotion scooter controller is developed, it will be able to expect an income substitution effect, and apply to the agriculture and leisure mobile equipment parts.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2002.10a
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• pp.193-197
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• 2002

Polyurethane casting wing fairings included in F-5E/F 15% spar kit are to be installed on aircraft wing surfaces and used for compensating the changes of the aerodynamic configuration by the leading edge extension fairings. These fairing are mandatory items in repairing wing areas and was imported from foreign supplier with long term delivery and high cost. Accordingly, local manufacturing is necessary to get rid of above disadvantages such as long term delivery and high cost. Basic properties test of specimen to be developed and part's requirements after localization was taken and its values were similar or higher when comparing with the original's even in low temp test at -55C. Casting mold process was used to manufacture the polyurethane fairings and its demensional stability ＆ physical condition was proper and met to the related specification and drawing's requirements

• The Journal of Korea Robotics Society
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• v.2 no.4
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• pp.289-296
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• 2007

The docking and recharging system for a mobile robot must guarantee the ability of the mobile robot to perform its tasks continuously without human intervention. In this paper, two docking mechanisms are proposed with localization error-compensation capability for the auto recharging system. Friction forces or magnetic forces are used between the docking parts of the docking module and those of the docking station. In addition, an auto recharging system is developed to control the power. Since the system is modularized, it can easily be adapted to other robots.

• International Area Studies Review
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• v.21 no.1
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• pp.163-179
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• 2017

Iran has been focused on FDI by global automobile companies after the economic sanction on Iran was removed except primary sanction. In this paper, some strategies for Korean Automobile Industry to branch out into Iran are suggested. For the purpose, Iran's automobile industry and characteristics are examined. The market situation is analyzed qualitatively and quantitatively. In passenger cars sector, Korean automobile companies would be better to wait and see the development of US-Iran relationships while exporting CKD sets of cars to Iran. It can be a good strategy, however, to put parts companies into Iran first because of Iran Government could be displeasing with exporting CKD only. FDI, licensing, and joint venture are all available for the parts companies. Motor companies can clear the regulation of auto-parts localization proportion by the method. The parts companies will be able to do key roles as supply chains after OEM branch out into Iran. It is also advisable to upgrade outpost in Iran into frontline for exporting cars to MENA area. In such a case it will be a prerequisite to develop a role-division model with facilities in East Europe. It could be called Parts first-then cars strategy. In commercial cars sector, it can be suggested to leverage natural gas as a link to branch out into Iran. Iran government wishes to develop natural gas resources. The strategy can be summarized that automobile companies carry out producing CNG buses in Iran while energy companies are drilling and producing natural gas.

• 한국신재생에너지학회:학술대회논문집
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• 2009.11a
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• pp.134-134
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• 2009

발전용 연료전지의 경쟁상황이 점점 치열해지고 있는 상황에서 경쟁력을 확보하기 위해서는 현재 상용화되어 있는 2세대 연료전지인 MCFC 관련 기술을 최대한 빨리 확보하고, 전세계적으로 R&D 단계에 있는 3세대 연료전지인 SOFC 관련 기술을 독자적으로 수행하여 가장 먼저 상용화하여야 할 것이다. 본 논문에서는 그 동안 MCFC 관련 사업 역량 및 응용 기술의 확보를 위하여 포스코 그룹이 수행한 사업 및 R&D 내용을 정리하고, 향후 SOFC 기술의 상용화를 위한 포스코 그룹의 전략을 발표하고자 한다. 또한 그 동안 SOFC 연구가 시스템 개발 위주로 진행되어 옴에 따른 문제점을 지적하고, SOFC 시스템 기술을 뒷받침할 수 있는 부품/소재 개발과 관련한 포스코파워의 연구 결과를 요약 발표하도록 한다.

• The Korean Journal of Zoology
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• v.29 no.2
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• pp.141-158
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• 1986

A glutathione peroxidase from white rat (Wistar strain)erythrocytes was partially purified and characterized. In addition, localization of this enzyme in the liver was studied by histochemical method. A glutathione peroxidase was purified approximately 33.5-folds by ammonium sulfate precipitation, Sephadex filtration column and DEAE-Sephadex column chromatography. The optimum temperature of the crude glutathione peroxidase was $40^\\circC$, and the optimum pH was 7.5. This crude glutathione peroxidase was most stable at $30^\\circC$ and the values of Km and Vmax were calculated to be 8.5mM and 15.6 $\\mu$moles/min for glutathione, and 40 $\\mu$M and 10.5 $\\mu$moles/min for hydrogen peroxide, respectively. The molecular weight of this enzyme was estimated by Sephadex G-200 gel filtration to be approximately 90, 000. By electron microscopic examination, histochemical reaction products were microbodies that were prominent in the peripheral parts of the lobule. The reaction products exhibited round shapes, the diameter of which varied $0.2\\sim0.7 \\muM$ and their boundary membranes were not distint.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.19 no.8
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• pp.816-827
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• 2009

This paper deals with a bearing faults localization technique based on holographic approach by visualizing sound radiated from the faults. The main idea stems from the phenomenon that bearing faults in a moving vehicle generate impulsive sound. To visualize fault signal from the moving vehicle, we can use the moving frame acoustic holography [Kwon, H.-S. and Kim, Y.-H., 1998, "Moving Frame Technique for Planar Acoustic Holography," J. Acoust. Soc. Am. Vol. 103, No. 4, pp. 1734${\sim}$1741]. However, it is not easy to localize faults only by applying the method. This is because the microphone array measures noise(for example, noise from other parts of the vehicle and the wind noise) as well as the fault signal while the vehicle passes by the array. To reduce the effect of noise, we propose two ideas which utilize the characteristics of fault signal. The first one is to average holograms for several frequencies to reduce the random noise. The second one is to apply the partial field decomposition algorithm [Nam, K.-U., Kim, Y.-H., 2004, "A Partial Field Decomposition Algorithm and Its Examples for Near-field Acoustic Holography," J. of Acoust. Soc. Am. Vol. 116, No. 1, pp. 172${\sim}$185] to the moving source, which can separate the fault signal and noise. Basic theory of those methods is introduced and how they can be applied to localize bearing faults is demonstrated. Experimental results via a miniature vehicle showed how well the proposed method finds out the location of source in practice.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.04a
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• pp.681-688
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• 2009

This paper deals with a bearing faults localization technique based on holographic approach by visualizing sound radiated from the faults. The main idea stems from the phenomenon that bearing faults in a moving vehicle generate impulsive sound. To visualize fault signal from the moving vehicle, we can use the moving frame acoustic holography [H.-S. Kwon and Y.-H. Kim, "Moving frame technique for planar acoustic holography," J. Acoust. Soc. Am. 103(4), 1734-1741, 1998]. However, it is not easy to localize faults only by applying the method. This is because the microphone array measures noise (for example, noise from other parts of the vehicle and the wind noise) as well as the fault signal while the vehicle passes by the array. To reduce the effect of noise, we propose two ideas which utilize the characteristics of fault signal. The first one is to average holograms for several frequencies to reduce the random noise. The second one is to apply the partial field decomposition algorithm [K.-U. Nam, Y.-H. Kim, "A partial field decomposition algorithm and its examples for near-field acoustic holography," J. of Acoust. Soc. Am. 116(1), 172-185, 2004] to the moving source, which can separate the fault signal and noise. Basic theory of those methods is introduced and how they can be applied to localize bearing faults is demonstrated. Experimental results via a miniature vehicle showed how well the proposed method finds out the location of source in practice.

• Journal of Broadcast Engineering
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• v.26 no.6
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• pp.748-757
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• 2021

In this paper, we propose a gaze estimation network in which eye landmark position detection and gaze direction vector estimation are integrated into one deep learning network. The proposed network uses the Stacked Hourglass Network as a backbone structure and is largely composed of three parts: a landmark detector, a feature map extractor, and a gaze direction estimator. The landmark detector estimates the coordinates of 50 eye landmarks, and the feature map extractor generates a feature map of the eye image for estimating the gaze direction. And the gaze direction estimator estimates the final gaze direction vector by combining each output result. The proposed network was trained using virtual synthetic eye images and landmark coordinate data generated through the UnityEyes dataset, and the MPIIGaze dataset consisting of real human eye images was used for performance evaluation. Through the experiment, the gaze estimation error showed a performance of 3.9, and the estimation speed of the network was 42 FPS (Frames per second).