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김병섭(Byung-Sub Kim),김영표(Young-Pyo Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
The traditional grinding operations involve expensive machinery and generally have long manufacturing cycles and lengthy setup times. Hard turning is an attractive replacement of grinding and may be used in a pre-grind operation or in sequences that are followed by superfinishing. Hard turning shows lower costs and increased throughputs compared with grinding operation. In this paper we present the results of structural analysis of a high precision hard turning machine, where displacement errors at the end of tool tip are estimated induced by X- and Z-axes table locations with constant-flow hydrostatic bearings.
ZnO 투명 전도막의 전기적 특성에 미치는 Al<sub>2</sub>O<sub>3</sub> 의 도핑 농도 및 방전전력의 효과
박민우,박강일,김병섭,이세종,곽동주,Park Min-Woo,Park Kang-Il,Kim Byung-Sub,Lee Se-Jong,Kwak Dong-Joo 한국재료학회 2004 한국재료학회지 Vol.14 No.5
Transparent ZnO:Al conductor films for the optoelectronic devices were deposited by using the capacitively coupled DC magnetron sputtering method. The effect of Al doping concentration and discharge power on the electrical and optical properties of the films was studied. The film resistivity of $8.5${\times}$10^{-4}$ $\Omega$-cm was obtained at the discharge power of 40 W with the ZnO target doped with 2 wt% $Al_2$$_O3$. The transmittance of the 840 nm thick film was 91.7% in the visible waves. Increasing doping concentration of 3 wt% $Al_2$$O_3$ in ZnO target results in significant decrease of film resistivity, which may be due to the formation of $Al_2$$O_3$ particles in the as-deposited ZnO:Al film and the reduced ZnO grain sizes. Increasing DC power from 40 to 60 W increases deposition rate by more than 50%, but can induce high defect density in the film, resulting in higher film resistivity.
가포화 자기스위치를 이용한 탈황탈질 시스템의 전원장치에 관한 연구
김수홍(Soo-Hong Kim),이용덕(Young-Duck Lee),김승모(Seung-Mo Kim),김병섭(Byung-Sub Kim),권병기(Byung-Ki Kwon),최창호(Chang-Ho Choi) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Generally, Capacitor charging power supply (CCPS) consist of the full-bridge inverter, LC resonant tank and capacitance load. The multi-connection systems are normally used for high voltage or high power application. In this paper, conventional parallel operation resonant type and proposed series operation PWM type CCPS for pulse corona occurrence of DeSOx, DeNOx system using magnetic pulse compressor make a comparison. The effect of proposed CCPS is verified by circuit characteristics analysis of parallel operation resonant type and series operation PWM type, and it is confirmed by simulation result.
형상기억합금 기반 공구클램핑 장치를 위한 자동공구교환 시스템 개발
신우철,노승국,김병섭,박종권,Shin, Woo-Cheol,Ro, Seung-Kook,Kim, Byung-Sub,Park, Jong-Kweon 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.5
This study developed an automatic tool change system of the SMA-based tool clamping device for applications of micro-machine tools. This paper first describes clamping and unclamping procedures of the automatic tool change system and its basic configuration. Second, it presents fabrication techniques of components, such as a heating/cooling system and a tool loader. Finally, it describes automatic tool change test conducted with a prototype in which the fabrication techniques of components were employed. As the results of the test, times needed for clamping and unclamping operations were estimated to 18(s) and 8(s) respectively. The experimental results confirm that the proposed automatic tool change system can be sucessfully applied to micro-machine tools.
신우철,노승국,김병섭,박종권,Shin, Woo-Cheol,Ro, Seung-Kook,Kim, Byung-Sub,Park, Jong-Kweon 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1
Conventional shrink-fit tool holders have positive features, such as high accuracy, high strength, high stiffness and low sensitivity to centrifugal forces, but they require heavy investments for heating and cooling equipment. Generally the heating equipment has to heat the tool holder up to $200{\sim}300^{\circ}C$ for tool changes. This paper introduces a novel shrink-fit tool holder that is able to unclamp a tool at $40{\sim}50^{\circ}C$. This feature makes it possible to switch between the clamped and unclamped states by using a simple device, which has lower power, smaller size and lower cost than the heating equipment of the conventional shrink-fit tool holders. The proposed shrink-fit tool holder is able to expand its tool hole by using the shape memory alloys which are integrated in the tool holder body. Performances of the SMA shrink-fit tool holder were evaluated experimentally. The experimental results confirm that the proposed tool holder is feasible in aspects of clamping/unclamping operations, clamping force and repeatability of tool setup.
이준영 ( Jun Young Lee ),김병섭 ( Byung Sub Kim ),박영민 ( Young Min Park ) 대한피부과학회 2016 대한피부과학회지 Vol.54 No.9
The level of terrorist threats using chemical, biological, and radiological agents has been continuously increasing, and it is an undeniable truth that these agents are actually in use today. The fact that most chemical, biological, and radiological agents cause skin-related symptoms, and that the skin symptoms are observed at a relatively early stage of the condition, leads to the conclusion that dermatologists could be the first point of contact for potential victims of these agents. It is highly important that first responders are able to recognize symptoms caused by these agents early and react quickly. Therefore, dermatologists do have a responsibility to take on a role in dealing with chemical, biological, and radiological attacks, and pre-equip themselves with professional knowledge in this field. Among the various types of chemical agents, typical examples of agents causing skin-related symptoms are blistering agents, which lead to bullae and necrosis on the skin. Biological agents are classified from Category A to C according to their respective risk factors. The most dangerous Category A agents include anthrax, smallpox, plague, tularemia, and viral hemorrhagic fever, all of which are known to show characteristic skin-related symptoms. Upon exposure to a certain level of radiation, radiological agents can also lead to erythema on the skin. In this article, we will discuss various characteristics and up-to-date treatment methods of potential chemical, biological, and radiological agents to help dermatologists advance their knowledge in this field. (Korean J Dermatol 2016;54(9):683 ∼692)