• 프린팅코리아
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• v.10 no.7
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• pp.98-99
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• 2011

한솔제지는 지난 5월 25일 7시부터 고객사를 대상으로 연극 늘근도둑이야기를 관람하는 문화행사를 진행했다. 연극관람에 앞서 한솔제지는 자사에서 생산하고 있는 종이에 관련된 퀴즈시간을 가져 정답을 맞추는 고객들에게 선물을 제공했다. 또한 연극관람 후에도 10명을 추첨해 다양한 선물을 증정했다.

• Journal of Korea Foundry Society
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• v.15 no.5
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• pp.431-448
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• 1995

• The Monthly Diabetes
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• s.261
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• pp.55-55
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• 2011

열대야에 잃어버린 입맛을 매콤한 음식으로 살려보자 '쓰러진 소도 벌떡 일으킨다'는 낙지는 영양분이 풍부한 스테미너 식품으로 저칼로리에 철분도 풍부해 빈혈예방에 좋다. 낙지에는 오징어와 같이 콜레스테롤이 들어 있으나 타우린을 함유하고 있어 이를 억제해준다. 닭볶음탕의 닭 껍질은 조리 시 미리 제거하고 살코기 위주로 섭취한다. 낙지나 닭볶음은 양념이 자극적이므로 많이 먹지 않도록 한다.

• The Monthly Diabetes
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• s.259
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• pp.57-57
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• 2011

입맛 없는 여름철, 살얼음 동동 띄운 냉면 한 그릇은 순간이나마 더위를 잊게 해준다. 여름철 단골 메뉴 냉면은 자극적인 음식이라 많이 먹지 않은 것이 좋다. 주원료가 탄수화물이고 시골로 우려낸 국물이 싼 편이라 혈당관리에 도움이 되지 않는다. 특히 비빔 냉면은 양념에 설탕이 많이 들어가 있어 혈당을 급속도로 올릴 수 있으니 주의해야 한다.

• Proceedings of the KOSOMBE Conference
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• v.1993 no.11
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• pp.77-80
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• 1993

• Journal of the Korea Computer Industry Society
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• v.4 no.12
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• pp.911-922
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• 2003

Nowadays, we can easily find student who study through computer in e-teaming environment. But, although e-teaming system has strong point that overcomes limitation of distance and time, many students give up their study through on-line learning. In this study, we developed On-Line learning motivation model, and designed and developed on-line quiz game loaming system. Thus we can find student's teaming motivation was grow up through student's interaction. Also, we find on-line quif game learning system had many information that explain student's status about their knowledge.

• Transactions of the Korean Society of Mechanical Engineers
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• v.19 no.2
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• pp.443-450
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• 1995

An analysis of the dynamics of a mechanical monoleaflet heart valve prosthesis in the closing phase is presented. Employing the moment equilibrium principles on the occluder motion and the squeeze film dynamics of the fluid between the occluder and the guiding strut at the instant of impact, the velocity of the occluder tip and the impact force were computed. The dynamics of fluid being squeezed between the occluder and the guiding struts is accounted for by Reynold's equation. The effect of the fluid being squeezed between the occluder and the guiding strut was to reduce the velocity of the occluder tip at the instant of valve closure as well as dampen the fluttering of the occluder before coming to rest in the fully closed position. The squeeze film fluid pressure changed rapidly from a high positive value to a relatively large negative value in less than 1 msec. The results of this study may be extended for the analysis of cavitation inception, mechanical stresses on the formed elements and valve components as well as to estimate the endurance limits of the prosthetic valves.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.15 no.3 s.96
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• pp.354-363
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• 2005

Squeeze film dampers (SFDs) have been commonly used to effectively enhance the dynamic behavior of the rotating shaft supported by rolling element bearings. However, due to the recent trends of high operating speed, high load capacity and light weight in rotating machinery, it is becoming increasingly important to change the dynamic characteristics of rotating machines in operation so that the excessive vibrations, which may occurparticularly when passing through critical speeds or unstable regions, can be avoided. Semi-active type SFDs using magneto-rheological fluid (MR fluid), which responds to an applied magnetic field with a change in rheological behavior, are introduced in order to find its applications to rotating machinery as an effective device attenuating unbalance responses. In this paper, a semi-active SFD using MR fluid is designed, tested, and identified to investigate the capability of changing its dynamic properties such as damping and stiffness.In order to apply the MR-SFD to the vibration attenuation of a rotor, a systematic approach for determining the damper's optimal location is investigated, and also, a control algorithm that could improve the unbalance response characteristics of a flexible rotor is proposed and its control performance is validated with a numerical example.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.13 no.7
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• pp.508-516
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• 2003

The dynamic characteristics of an ell-lubricated, short squeeze film damper (SFD) with a central feeding groove are derived based on a theoretical analysis considering the effect of a groove, and identified experimentally using an Active Magnetic Bearing (AMB) system as an exciter. In order to get the theoretical solution, the fluid film forces of the grooved SFD are analytically derived so that the dynamic coefficients of the SFD can be expressed in terms of its design parameters. For the experimental validation of the analysis, a test rig using an AMB as an exciter is proposed. As an exciter. the AMB represents a mechatronic device to levitate and position the test Journal without any mechanical contact, to generate relative motions of the Journal inside the tested SFD and to measure the generated displacements during experiments with fairly high accuracy. Using this test rig, experiments are extensively conducted with various values of clearance, which Is one of the most important design parameters. in order to investigate its effect on the dynamic characteristics and the performance of the SFD. Damping and Inertia coefficients of the SFD that are experimentally Identified are compared with the analytical results to demonstrate the effectiveness of the applied analysis. It Is also shown that the AMB is an ideal device for tests of SFDs.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.1005-1011
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• 2004

Squeeze film dampers (SFDs) have been commonly used to effectively enhance the dynamic behavior of the rotating shaft supported by rolling element bearings. However, due to the recent trends of high operating speed, high load capacity and light weight in rotating machinery, it is becoming increasingly important to change the dynamic characteristics of rotating machines in operation so that the excessive vibrations, which may occur particularly when passing through critical speeds or unstable regions, can be avoided. Semi-active type SFDs using magneto-rheological fluid (MR fluid), which responds to an applied magnetic field with a change in rheoloaical behavior, are introduced in order to find its applications to rotating machinery as an effective device attenuating unbalance responses. In this paper, a semi-active SFD using MR fluid is designed, tested and identified by means of linear analysis to investigate the capability of changing its dynamic properties such as damping and stiffness. Furthermore, the proposed device is applied to a rotor system to investigate its potential capability for vibration attenuation: an efficient method for selecting the optimal location of the proposed damper is introduced and control algorithm that could improve the unbalance response properties of a flexible rotor is also proposed.