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한복수,김기수 충남대학교 공업교육연구소 1996 論文集 Vol.19 No.1
This paper deals with the ultrasonic vibration cutting for the precision machining of aluminum alloy. When the ultrasonic vibration is applied on the tool, the cutting tool makes periodical contact with workpiece. And, the cutting is performed by vibrating impact force while the cutting tool contacts the workpiece. In this paper, the horn of ultrasonic vibration system were designed and manufactured, to compare the ultrasonic vibration cutting with the conventional cutting, the machined surface roughness of aluminum alloy in turning were experimentally measured. The experiments revealed that the ultrasonic vibration cutting had the best surface roughness than the conventional cutting under the same cutting condition.
한복수,박성환,명태식,권경우 大田産業大學校 2001 한밭대학교 논문집 Vol.18 No.-
Precision machining widely bases on the technology connected with machine tools, machining and others. The prototype was designed in the base of the analysis of the precision air bearing spindle which have greate influence upon the machining accuracy of the precision machine. The contents in this study are as follows. 1) Design and manufacture of the spindle system, 2) Performance test of the system. The spindle system is made of aero-static, which has the excellent rotation accuracy was designed and manufactured. As a result of the test (static vibration, dynamic vibration, spindle rotation), the air spindle system was stability. We think that this system can apply to the ultra-precision machine tools.
韓福洙,朴性煥 한밭대학교 산업과학기술연구소 2001 논문집 Vol.5 No.-
The high speed precision spindle, which is an important element part of industrial machinery such as micro drilling, high speed machine tools and the atomizer. In this study, the aero-static spindle was designed and a stiffness analysis of air bearing was carried out to investigate the optimal design parameter for the high speed spindle.
홍준희,한복수 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.1
In a high speed spindle system, it is very important to monitor the state of rotating rotor. Particularly in active control spindle system, the position sensor must provide feedback to the control system on the exact position of the rotor. In order to monitor the state of a high speed spindle exactly, high accuracy and wide frequency bandwidth of sensors are important. The focus in this paper is to make a fiber optic sensor for monitoring rotor of magnetic bearing to design the circuit for detecting optical signal, and to evaluation static and dynamic characteristics of fiber optic sensor.
디지탈 영상처리를 위한 데이타 취득 시스템에 관한 연구
박규태,진용옥,김장복,박명구,신태민,김한주 연세대학교 산업기술연구소 1983 논문집 Vol.15 No.2
A computer vision system for recognition and processing any visible objects is designed. Analog video images are digitized and stored in the internal memory of a microcomputer system and these digitized data are output through a bit-image printer. The kirsch edge operator is used for the processing. In order to compare the result of Kirsch edge enhancement, two images "a Man" and "a figure" are tested. Because of the limitations of the speed of A/D converter and the capacity of internal memory, the operation of the system is a still-picture mode. Upper 4 bit date of the memory are used for printing out the image, so as to the gray levels are sixteen. The output size of the bit-image printer is 120x120, and 2 horizontal lines are printed simultaneously per 1 carriage return because the printer has a 8 pin head. The system is designed to have compatibility with any microcomputer system which has a S-100 bus structure.
한영복,박우찬 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.2
129 cases of diabetic retinopathy were classified into background and proliferative types and type I and type II diabetes. Each case of diabetic retinopathy was analyzed according to the sex, age, duration of diabetes, visual acuity, and complications such as vitreous hemorrhage, tractional retinal detachment, neovascular glaucoma, and macular edema. The results were as follows: 1. Among 129 diabetic retinopathy patients, the incidence of type I was 18.6% and type II was 81.4%, and background retinopathy was 61.2% and proliferative type was 38.8% Type I diabetes was significantly associated with proliferative retinopathy than type II. 2. The peak incidence of diabetic retinopathy was in 6th decade. 3. The incidence of proliferative retinopathy increased with duration of diabetes mellitus. 4. The visual acuity of proliferative retinopathy was significantly worse than that of background retinopathy, and the risk of visual impairment also incresed with duration of diabetes and age at diagnosis of diabetes. 5. The incidence of blindness was 11.6% and the most common cause of blindness was vitreous hemorrhage. 6. The most common complication was vitreous hemorrhage in proliferative retinopathy and cataract in background retinopathy.
What factors can be related to predicting Ethereum prices?
Han-Min Kim,Gee-Woo Bock,Gunwoong Lee 한국경영정보학회 2019 한국경영정보학회 학술대회논문집 Vol.2019 No.5
With the growing interest in cryptocurrency and its algorithm, studies on cryptocurrency price predations have been extensively conducted in various academic disciplines. Since the cryptocurrency is generated and consumed by the Blockchain system, it has been considered that Blockchain-specific information would be the main components in predicting cryptocurrency prices. Specifically, this point of view has been largely employed in the studies of Bitcoin price predictions. However, this study recognizes that Ethereum, a popular and leading cryptocurrency in the market, has distinct Blockchain information as compared to that of Bitcoin. We attempt to investigate the relationships between inherent Ethereum Blockchain information and Ethereum prices. Furthermore, the research examines how Blockchain information of other coins in the market is associated with Ethereum prices. The results of data analysis show that Ethereum Blockchain information and Blockchain information of other coins are associated with the final Ethereum prices.