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이인환 ( In Hwan Lee ),강준희 ( Jun Hee Kang ) 충북대학교 산업과학기술연구소 2011 산업과학기술연구 논문집 Vol.25 No.1
Additive manufacturing (AM) technology is widely used to manufacture prototype, mold and products. There are various AM technologies according to the materials and plastic, metal, ceramic and paper are the major materials. These materials are used alone for each AM technology; hence there are limitations to produce various applications. This is a fundamental research for the multi-material AM technology which composed of stereolithography and direct writing technology. In this research, pattern generation characteristics of the conductive material direct writing is conducted experimentally. From the experimental results, it was found that a smaller nozzle diameter is favorable for a smaller width of the conductive ink rather then faster nozzle speed and/or lower flow rate of the ink. And there are a certain range of nozzle speed and flow rate for a given nozzle speed to fabricate a stable line width fabrication. A sample pattern was fabricated successfully using experimental results.
Study of the Switching Errors in an RSFQ Switch by Using a Computerized Test Setup
김세훈,백승헌,양정국,김준호,강준희,Kim, Se-Hoon,Baek, Seung-Hun,Yang, Jung-Kuk,Kim, Jun-Ho,Kang, Joon-Hee The Korean Superconductivity Society 2005 Progress in superconductivity Vol.7 No.1
The problem of fluctuation-induced digital errors in a rapid single flux quantum (RSFQ) circuit has been a very important issue. In this work, we calculated the bit error rate of an RSFQ switch used in superconductive arithmetic logic unit (ALU). RSFQ switch should have a very low error rate in the optimal bias. Theoretical estimates of the RSFQ error rate are on the order of $10^{-50}$ per bit operation. In this experiment, we prepared two identical circuits placed in parallel. Each circuit was composed of 10 Josephson transmission lines (JTLs) connected in series with an RSFQ switch placed in the middle of the 10 JTLs. We used a splitter to feed the same input signal to both circuits. The outputs of the two circuits were compared with an RSFQ exclusive OR (XOR) to measure the bit error rate of the RSFQ switch. By using a computerized bit-error-rate test setup, we measured the bit error rate of $2.18{\times}10^{-12}$ when the bias to the RSFQ switch was 0.398 mA that was quite off from the optimum bias of 0.6 mA.
이승한(Seoung-Han Lee),강준희(Jun-Hee Kang),정의봉(Eui-Bong Jeong) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
When developing a military vehicle, the endurance test must be performed. This test is to determine whether a vehicle meets the required distance and life span. In this paper, the driving durability test criteria proposed by the US military standard are summarized for reference when developing military wheeled vehicles and tracked vehicles.