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- 저자 : 이문구 (검색결과 347 건)
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이문구,란 슈하이,이수훈,Jun Ni,성연욱,이혜진 한국생산제조학회 2009 한국생산제조학회지 Vol.16 No.3
Large area micro pattern replication has promising application potential in many areas. Rolling imprint process has been demonstrated as one of the most competitive processes for such micro pattern replication, because it has advantages in low cost, high throughput and high efficiency. In this paper, we developed a prototype of roll-to-flat(R2F) thermal imprint system for large area micro pattern replication process, which is one of the key processes in the fabrication of flexible displays. Experimental tests were conducted to evaluate the feasibility of system and the parameters’ effect on the process, such as flat mold temperature, loading pressure and rolling speed. 100mm × 100mm stainless steel flat mold and commercially available polycarbonate sheets were used for the tests. The experimental results showed that the developed R2F system is suitable for fabrication of various micro devices with micro pattern over large area.
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이문구,권대갑,Lee, Moon-G,Gweon, Dae-Gab 대한기계학회 1997 대한기계학회논문집 Vol.21 No.5
In this paper, a new modeling of a fine actuator for an optical pick-up has been proposed and multiobjective optimization of the actuator has been performed. The fine actuator is constituted of the bobbin which is supported by wire suspension, the coils which wind around the bobbin, and the magnets which cause the magnetic flux. If current flows in the coils, magnetic force is so produced as to be balanced with spring force of wire, so the bobbin is pisitioned. In this model the transfer function from input voltage to output displacementof bobbin has been obtained so that we can describe this integrated system with electromagnetic and mechanical parts. Wire suspension is regarded as a continuous Euler beam, damper as distributed viscous damping, and bobbin as a rigid body which can move up- and down- ward motion only. According to the model, the high frequency dynamic characteristics of the fine actuator can be known and the effect of damping can be investigated while the conventional second order model cannot. In multiobjective optimization, two objective functions have been chosen to maximize the fundamental frequency and the sensitivity with respect to the input voltage of the actuator so that Pareto's optimal solutions have been obtained using .epsilon.-constraint method. These objective functions will satisfy the trends which will enhance the access speed and reduce the tracking error in the optical pick-up technology of next generation. In the result of optimization, we obtain the designs of the optical pick-up fine actuator which has high speed, high sensitivity and low resonant peak. Furthermore, we offer the relation between two object functions so that the designer can make easy choice.
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정보보호 전문 인력 양성을 위한 교육과정 모델에 관한 연구
이문구,Lee, Moon-Ku 한국컴퓨터산업학회 2004 컴퓨터産業敎育學會論文誌 Vol.5 No.8
The spreading of internet, combined with the computerization of industry and the life whole has created an incereased demand on the private life protection and information portection, but due to the lack of specialty manpower on the information protection industry field there are many difficulties. Therefore, in this paper a curriculum for an information protection specialty manpower training is proposed. The proposed curriculum indispensability 1,2 and classified with a selection 1,2 and classified with a selection 1,2. The information protection application field into 9 segments of domains, and to carry out the curriculum in a ring structure. The curriculum based on the information security field's 9 domains and related field practical business, and the course offered after graduation to deepen the specialty, need to be carried out by each domain in order to continuously carry out the information security deepening process.
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이문구 한국컴퓨터산업학회 2001 컴퓨터産業敎育學會論文誌 Vol.2 No.8
As the internet environment has been rapidly changed, the scale of internet network that needs to be managed has been magnified. In this way, the recognition for the importance of security became extensive, and numerous security systems for the protection of internal information were introduced. But decentralized security systems because of there use of different user interfaces undergo difficulties in effective security management as well as prompt coping when an obstacle happens causing a corpulence of in the security management part. In this paper, I propose an integrated security management system which can grasp the situation of each system and manage every system in the center so that we can consistently and integrally manage every system. Integrated security management system with multi agents has the advantages of prompt coping with obstacles, and the minimization of weaknesses that different security solutions have, and of consistent control and management for decentralized security systems.
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이문구,란 슈하이,이수훈,이혜진,성연욱,Lee, Moon-G.,Lan, Shuhuai,Lee, Soo-Hun,Lee, Hye-Jin,Ni, Jun,Sung, Yeon-Wook The Korean Society of Manufacturing Technology Eng 2009 한국공작기계학회지 Vol.18 No.3
Large area micro pattern replication has promising application potential in many areas. Rolling imprint process has been demonstrated as one of the most competitive processes for such micro pattern replication, because it has advantages in low cost, high throughput and high efficiency. In this paper, we developed a prototype of roll-to-flat(R2F) thermal imprint system for large area micro pattern replication process, which is one of the key processes in the fabrication of flexible displays. Experimental tests were conducted to evaluate the feasibility of system and the parameters' effect on the process, such as flat mold temperature, loading pressure and rolling speed. 100mm $\times$ 100mm stainless steel flat mold and commercially available polycarbonate sheets were used for the tests. The experimental results showed that the developed R2F system is suitable for fabrication of various micro devices with micro pattern over large area.
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