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이용중,김태원,김기대,류재엽,이형우 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
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 monolithic 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.
단면의 성질을 적용한 크기와 회전 변화에 불변인 영상 검사 시스템
이용중,김태원,김기대,류재엽 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
The purpose of this paper is to develop image inspection system endows an automatic operating and measuring that the moment values are invariant with respect to variable object size and rotation. In this paper, using these moment feature vector with Hu's 7 invariant moment is also given. The charasteristics of section which is applied in the mechanics used moment descriptor of invariant moment detection algorithm for image inspection system. Corresponding rates between 94% and 96% have been achived for all object tested.
다양한 Stress에 의한 백화된 동진벼 유모의 Peroxidase 활성 변화
민중기,이미영 순천향대학교 기초과학연구소 2001 순천향자연과학연구 논문집 Vol.7 No.1
The changes of peroxidase activities in the etiolated seedlings of DongJinbyeo under various stresses such as dehydration, wound, temperature, salt and heavy metal were investigated. Interestingly high temperature stress enhanced total peroxidase activity of the stem, while it reduced enzyme activity of the root. Moreover, 3 fold and 2.5 fold increase of total peroxidase activity occurred with PbCl2 and CdCl2 stress, respectively. These results suggest that the increases of total peroxidase activities might be involved in the defense mechanism against these stresses.
빛과 다양한 Stress가 Peroxidase의 활성 및 Cationic Isoperoxidase Pattern에 미치는 영향
민중기,이미영 순천향대학교 기초과학연구소 2001 순천향자연과학연구 논문집 Vol.7 No.1
Effects of light and various stresses such as dehydration, wound, temperature, salt and heavy metal on the peroxidase activities and isoperoxidase pattern were examined in Dongjinbyeo seedlings grown under the light for 6 days. The changes of total peroxidase activities and specific isoperoxidase level in the root and stem of the green seedlings under these stresses were investigated in detail.
식물 추출액으로부터 HMG-CoA 환원효소의 활성억제제 탐색
민중기,이미영 순천향대학교 기초과학연구소 2002 순천향자연과학연구 논문집 Vol.8 No.1
Several herbal plants were extracted with hot waters and evaporated for the prescreening of possible inhibitor of 3-hydroxy-3-methylglutaryl-conenzyme A (HMG-CoA) reductase, the major regulatory enzyme of hepatic cholesterol biosynthesis. The hot water extracts of the herbal plants were fractionated with hexane, methylenechloride, ethylacetate and butanol. The degree of inhibition of the extracts to HMG-CoA reductase activity was measured by spectrophotometric method using microsomal protein of liver as an enzyme source. The notable inhibitory effects were found in Vitis vinifera extract among the plant extracts used in this study.
가토의 골수내 식염수 주입이 말초혈액 제변수에 미치는 영향
황주일,김세경,이원재,이기중,김병기,박규남,김인철 大韓應急醫學會 1992 대한응급의학회지 Vol.3 No.1
Study Objective: To examine the effects of intraosseous saline infusion on hematologic parameters. Design and Setting: Eight New Zealand White rabbits were anesthized intramuscular ketamine injection, An initial blood sample was withdrawn from an earlobe artery under introduction of anesthesia. An 18-gauge intraosseous(10) needle was inserted into proximal tibia of rabbits, and 10 mL/kg of normal saline was infused over two minutes after the intraosseus needle insertion. Measurements: Complete blood counts were performed on the blood sampled. The light microscopic examination of the peripheral blood smear was perfomed by clinical pathologic staff. Results: No statistically significant differences were found in hematologic paramenters from samples drawn before and after intraosseous infusion. Conclusion: We advocate less caution in the interpretation of hematologic studies performed on blood samples obtained soon after an intraosseous infusion.