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- 저자 : 李庸中(Yong-Joong Lee) (검색결과 50 건)
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이용중(Yong-Joong Lee),김태원(Tae-Won Kim),김기대(Kee-Dae Kim),류재엽(Jae-Yup Ryu),이형우(Hyung-Woo Lee) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.10
It is necessary for managing a perfect process for degasing aluminum molten metal according to the increase of a grade of aluminum and its alloy products. There are some methods that have been used to manage a degasing process in recent years, such as an injection method that uses aluminum molten metal powder and chemicals supplier and input method that supplies argon and nitrogen. or chlorine gas by using a gas blow-tube. However, these methods show some problems. and it shows that it is a difficult process to handle. pollution due to the producing a lot of toxic gases like chlorine and fluoride gas, irregular effects, and lowering work efficiency due to the excessive processing time. The problems that are the most fatal are the producing a lot of sludge due to the reaction of aluminum molten metal with chemicals, loss of metals, and decreasing the life of refractory materials. In order to solve these problems. this paper develops a technology that is related to aluminum continuous casting molten metal and monolithic degasing apparatus. A degasing apparatus developed in this study improved the existing methods and prevented environmental pollution with smokeless, odorless, and harmlessness by using a new method that applies argon and nitrogen gas in which the methods used in the West and Japan are eliminated. The developed method can significantly reduce product faults that are caused by the production of gas and oxidation because it uses a preprocessed molten metal with chemicals. In addition. the amount of the produced sludge can also be reduced by 60-80% maximum compared with the existing methods. Then, it makes it possible to minimize the loss of metals. Moreover. the molten metal processing and settling time is also shortened by comparing it with the existing methods that are applied by using chemicals. In addition, it does much to improve the workers' health, safety and environment because there is no pollution. The improvement of productivity and prevention effects of disaster from the results of the development can be summarized as follows. It will contribute to the process rationalization because it does not have any unnecessary processes that the molten metal will be moved to an agitator by using a ladle and returned to process for degasing like the existing process due to the mono lithic configuration. There are no floating impurities due to the oxidation caused by the contact with the air as same as the existing process. In addition. it can protect the blending of precipitation impurities. Because it has a monolithic configuration. it can avoid the use of additional energy to compensate the temperature decreasing about 60℃ that is caused by the moving of molten metal. It is not necessary to invest an extra facilities in order to discharge the gas generated from a degasing process by using an agitator. The working environment can be improved by the hospitable air in the factory because the molten metal is almost not exposed in the interior of the area.
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Application of Curve Interpolation Algorithm in CAD/CAM to Remove the Blurring of Magnified Image
Yong-Joong Lee(이용중) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
This paper analyzes the problems that occurred in the magnification process for a fine input image and investigates a method to improve the problems. This paper applies a curve interpolation algorithm in CAD/CAM for the same test images with the existing image algorithm in order to improve the problems. As a result, the nearest neighbor interpolation, which is the most frequently applied algorithm for the existing image interpolation algorithm, shows that the identification of a magnified image is not possible. Therefore. this study examines an interpolation of gray-level data by applying a low-pass spatial filter and verifies that a bilinear interpolation presents a lack of property that accentuates the boundary of the image where the image is largely changed. The periodic B-spline interpolation algorithm used for curve interpolation in CAD/CAM can remove the blurring but shows a problem of obscuration, and the Ferguson's curve interpolation algorithm shows a more sharpened image than that of the periodic B-spline algorithm. For the future study. hereafter. this study will develop an interpolation algorithm that has an excellent improvement for the boundary of the image and continuous and flexible property by using the NURBS, Ferguson's complex surface, and Bezier surface used in CAD/CAM engineering based on the results of this study.
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이용중(Yong-Joong Lee) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.10
Although an individual high frequency heating method used in the present time applies vacuum tubes as a major part, the general purpose high frequency brazing welding system used in this study applies a new production technology using semiconductor elements that minimizes the cost for replacements and is able to apply a high speed switching. A vacuum element requires a high frequency of more than 100MHz and affects the safety and health of workers due to the large amount of electromagnetic waves. The high frequency welding system for general frequency bands developed in this study uses a processing switch with magnetic and non-magnetic substances to apply an easy switching and is able to produce a more stable frequency, 5MHz-50MHz, compared to that of the application of vacuum elements. Thus, the problems occurred in the use of vacuum elements can be solved using the welding machine developed in this study. In addition, it presents an easy approach to the object that is to be heated due to the general purpose of this system.
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이성중(Sung Joong Lee),인병현(Byung Hyun In),고정곤(Jeong Gon Go),천기태(Ki Tae Cheon),이용철(Yong Chul Lee),이양근(Yang Keun Rhee),이동근(Dong Keun Lee) 대한내과학회 1996 대한내과학회지 Vol.50 No.3
We desceribe a case of pulmonary capillary hemangiomatosis in a 52-year-old woman with history of hemoptysis. Pulmonary capillary hemangiomatosis is a locally aggressive benign neoplasm of the lung characterized by the presence of numerous cytologically benign thin walled capillary-sized blood vessel proliferating diffusely through the pulmonary interstitium, in and around pulmonary vessels and airway. Pulmonary capillary hemangiomatosis is characterized by a slow progressive clinical course with. sign and symptom of pulmonary hypertension, hemoptysis and right heart failure. The cause of capillary hemangimatosis is as yet unknown. Definitive diagnosis can only be made histologically. Complication may occur in the form of necrosis, shunting, inflammatory process, and local compression or obstruction leading to respiratory failure. We experienced a case of pedunculated capillary hemagioma of the bronchus, and report with review of literatures.
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An Implementation of an Integrated Degasing System for Aluminum Molten Metal in Continuous Casting
이용중(Yong-Joong Lee) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.1
There are some methods that have been used to manage a degasing process in recent years, such as an injection method that uses aluminum molten metal powder and chemicals supplier and input method that supplies argon and nitrogen, or chlorine gas by using a gas blow-tube. However, these methods show some problems, and it shows that it is a difficult process to handle, pollution due to producing a lot of toxic gases like chlorine and fluoride gas, irregular effects, and lowering work efficiency due to the excessive processing time. The problems that are the most fatal are the producing a lot of sludge due to the reaction of aluminum molten metal with chemicals, loss of metals, and decreasing the life of refractory materials. In order to solve these problems, this paper develops a technology that is related to aluminum continuous casting molten metal and monolithic degasing apparatus. A degasing apparatus developed in this study improved the existing methods and prevented environmental pollution with smokeless, odorless, and harmlessness by using a new method that applies argon and nitrogen gas in which the methods used in the West and Japan are eliminated. The method developed in this study decreases the molten metal processing and settling time compared to the existing methods and improves the workers' health, safety, and environment because there is no pollution in processes.
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