• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 춘계학술대회 논문집
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• pp.457-458
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• 2007

• Journal of Mechanical Science and Technology
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• 제15권9호
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• pp.1207-1216
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• 2001

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.267-268
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• 2010

• 한국기계가공학회지
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• 제12권5호
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• pp.9-15
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• 2013

Roll-to-roll printing technology has lately become a subject of special interests in the field of printed electronics. Since this technology has the advantage that continuous and mass production is possible. And for high precision register control is required in multi-layer printing to produce the electronic devices, this is one of the most important technologies in roll-to-roll printing technology. Register error could be generated by various reasons like eccentricity of roll and thermal deformation due to temperature variation in drying section. In this study, the effect of tension variation on the register was analyzed. The results of these analyses show that it is essential to consider the tension disturbance which is generated by the change of temperature in drying section, and conventional register model has limitation to estimate the register error. In order to overcome the limitation of the register model, advanced register model based on the SI process was developed. Also, the performance of the developed model was verified experimentally.

• Steel and Composite Structures
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• 제9권4호
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• pp.325-348
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• 2009

This paper is concerned with steel-concrete composite plate girders curved in plan. At the design stage these girders are assumed sometimes to act independent of the deck slabs resting on them in order to simplify the analysis. The advantage of composite action between the steel girders and concrete deck is not utilized. Finite element modeling of such composite action in plate girders is considered in this paper. Details of the finite element modeling and the non-linear analysis of the girders are presented along with the results obtained. Tension field action in the web panels similar to those observed in the straight plate girders is also noticed in these girders. Finite element and experimental results in respect of curved steel plate girders and straight composite plate girders tested by other researchers are presented first to assess the accuracy of the modeling. Effects of parameters such as curvature, steel flange width and web panel width that affect the behavior of composite girders are then considered in the analyses. An approximate method to predict the ultimate strength of horizontally curved composite plate girders is also presented.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.48-50
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• 2005

This paper presents the design and development of web control algorithm of continuous process control system using vector inverter. The Diameter of web is calculated, tension is controlled by PID control and the speed reference of motor is calculated at current diameter. The performance of web control in this paper is verified by experiment.

• 지식경영연구
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• 제23권3호
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• pp.259-284
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• 2022

본 연구는 웹소설 이용자에 대한 이해를 돕고자 웹소설 사용자의 행동 유형을 정량적으로 검증하고자 하였다. 이를 위해 연구의 방향은 다음과 같이 진행되었다. 먼저 웹소설 이용자들이 어떤 주된 이용 동기를 갖고 작품을 읽는지를 다른 디지털 콘텐츠의 이용 동기를 참조하여 조사를 진행하였으며, 추가로 이용자의 구체적인 행동 유형도 수집하였다. 그 결과, 웹소설 이용 동기는 '타인과의 대인관계 및 정보 습득', '여가 활동', '현실도피/긴장 해소' 요인으로 나타났다. 또한 구체적으로 어떤 이용 동기에 따라 차이가 나타나는지 군집분석을 한 결과로 여가 활동 이용 동기가 특히 높은 유형의 집단인 '취미 생활'형, 현실 도피 및 긴장 해소 특성이 매우 높은 집단인 '스트레스 해소'형, 타인과의 대인 관계 및 정보 습득이 높은 집단인 '커뮤니케이션'형, 마지막으로 전반적으로 다른 동기 특성 모두 높게 나오는 '다목적'형으로 분류되었다. 이후에 군집 유형 간 특징을 알아보기 위해 차이가 있는 행동 유형을 페르소나로 정리하였다. 이를 통해 본 연구의 이론적 공헌으로 웹소설 이용자의 이용 동기를 밝혀냈다는 점에서 의의가 있으며, 실무적 공헌으로는 이용자의 이용 동기와 행동 패턴을 결합한 페르소나를 구성하여 실제 대표적인 사용자에 가깝도록 시각화하여 실제 작가, 플랫폼 담당자, 사용자들에게 실무적으로 유용한 지표를 마련하는 것으로 웹소설 서비스의 고도화에 도움이 될 것으로 기대하고 있다.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2002년도 춘계학술발표논문집
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• pp.76-84
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• 2002

Fracture toughness was considered as one of the good estimates of the paper break tendency of paper web in the press room. Paper break on the paper machine is caused by many factors such as paper machine irregular vibrations, impurities in the fiber furnish, shives, and so on. On the paper machine, the solid content of paper web is changing very rapidly from less than 1% to over 95%. We tried to measure the fracture toughness of paper web at different solid contents for providing the fundamental knowledge of paper break. Stretches of wet web were also measured and compared to the fracture toughness changes. Four different fiber furnishes (SwBKP, HwBKP, ONP, and OCC) were refined to different degrees, and at different solid contents (40%, 60%, 80%, and 95%), their fracture toughnesses were measured. Two fracture toughness measurement methods (essential work of fracture and Tryding's load-widening method) were used, and we found they gave identical results. The stretch curves of the wet webs against the axis of solid contents were very similar to the fracture toughness curves of those.

• 펄프종이기술
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• 제33권5호
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• pp.37-44
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• 2001

Fracture toughness was considered as one of the good estimates of the paper break tendency of paper web in the press room. Paper break on the paper machine is caused by many factors such as paper machine irregular vibrations, impurities in the fiber furnish, shives, and so on. On the paper machine, the solid content of paper web is changing very rapidly from less than 1% to over 95%. We tried to measure the fracture toughness of paper web at different solid contents for providing the fundamental knowledge of paper break. Stretches of wet web were also measured and compared to the fracture toughness changes. Four different fiber furnishes (SwBKP, HwBKP, ONP, and OCC) were refined to different degrees, and at different solid contents (40%, 60%, 80% and 95%), their fracture toughnesses were measured. Two fracture toughness measurement methods (essential work of fracture and Tryding's load-widening method) were used, and we found they gave identical results. The stretch curves of the wet webs against the axis of solid contents were very similar to the fracture toughness curves of those.

• Steel and Composite Structures
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• 제22권6호
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• pp.1417-1443
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• 2016

Cellular and castellated steel beams are used to obtain higher stiffness and bending capacity using the same weight of steel. In addition, the beam openings may be used as a pass for different mechanical fixtures such as ducts and pipes. The aim of this study is to investigate the effect of different parameters on both elastic and inelastic critical buckling stresses of steel web plates with openings. These parameters are plate aspect ratio; opening shape (circular or rectangular); end distance to the first opening; opening spacing; opening size; plate slenderness ratio; steel grade; and initial web imperfection. The web/flange interaction has been simplified by web edge restraints representing simply supported boundary conditions. A numerical parametric study has been performed through linear and nonlinear finite element (FE) models, where the FE results have been verified against both experimental and numerical results in the literature. The web plates are subject to in-plane linearly varying compression with different loading patterns, ranging from uniform compression to pure bending. A buckling stress modification factor (${\beta}$-factor) has been introduced as a ratio of buckling stress of web plate with openings to buckling stress of the corresponding solid web plate. The variation of ${\beta}$-factor against the aforementioned parameters has been reported. Furthermore, the critical plate slenderness ratio separating elastic buckling and yielding has been identified and discussed for two steel grades of DIN-17100, namely: ST-37/2 and ST-52/3. The FE results revealed that the minimum ${\beta}$-factor is 0.9 for web plates under uniform compression and 0.7 for those under both compression and tension.