• Proceedings of the Korean Fiber Society Conference
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• 2007.11a
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• pp.189-190
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• 2007

• Proceedings of the Korea Multimedia Society Conference
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• 2001.06a
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• pp.395-398
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• 2001

웹을 기반으로 하는 개방적이고 유연한(Open and Flexible) 많은 교수 및 학습 시스템(Teaching and Learning Systems)이 개발되어 사용되어지면서 교육현장에서 교육의 패러다임이 급변하고 있다. 이에 따라 본 연구에서는 누구나 언제 어디서나 (Anyone, Anytime and Anywhere) 교수 및 학습이 가능한 웹기반 원격장의 시스템에서 원적교육의 방식과 특성을 모색해보고 쌍방향 멀티미디어 원격교육을 가능하게 하는 GVA를 이용하여 코스웨어를 구현함으로써 원격교육시스템의 실질적인 대안을 제시한다.

• Structural Engineering and Mechanics
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• v.61 no.4
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• pp.475-481
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• 2017

An overhead travelling crane structure of two doubly symmetric welded box beams is designed for minimum cost. The rails are placed over the inner webs of box beams. The following design constraints are considered: local buckling of web and flange plates, fatigue of the butt K weld under rail and fatigue of fillet welds joining the transverse diaphragms to the box beams, fatigue of CFRP (carbon fibre reinforced plastic) laminate, deflection constraint. For the formulation of constraints the relatively new standard for cranes EN 13001-3-1 (2010) is used. To fulfill the deflection constraint CFRP strengthening should be used. The application of CFRP materials in strengthening of steel and concrete structures are widely used in civil engineering applications due to their unique advantages. In our study, we wanted to show how the mechanical properties of traditional materials can be improved by the application of composite materials and how advanced materials and new production technologies can be applied. In the optimization the following cost parts are considered: material, assembly and welding of the steel structure, material and fabrication cost of CFRP strengthening. The optimization is performed by systematic search using a MathCAD program.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.46 no.6
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• pp.8-15
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• 2014

The increase of wet web solid content in wet pressing will save drying energy greatly. We applied wood flours as spacers to increase the old corrugated container (OCC) solid contents in wet pressing. The mixed furnish of OCC and wood flours of 3-5% (wt/wt) increased bulk and drainage rate, and by increasing wet pressing pressure, its solid content started to be higher than 100% OCC furnish at more than 50% solid content level. Addition of cationic starch and drainage aid to the mixed furnish increased solid content further up to around 2%. Cationic starch addition compensated or exceeded the loss of tensile and compressive strength caused by the addition of wood flour, but drainage aid did not. Cationic starch also improved the stretch of the OCC, which could mitigate cracking at folding in boxboard.

• Applied Science and Convergence Technology
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• v.24 no.5
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• pp.162-166
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• 2015

Linear ion beams have been introduced for the ion beam treatments of flexible substrates in roll-to-roll web coating systems. Anode layer linear ion sources (300 mm width) were used to make the linear ion beams. Oxygen ion beams having an ion energy from 200 eV to 800 eV used for the adhesion improvement of Cu thin films on PET substrates. The Cu thin films deposited by a conventional magnetron sputtering on the oxygen ion beam treated PET substrates showed Class 5 adhesion defined by ASTM D3359-97 (tape test). Argon ion beams with 1~3 keV used for the ion beam sputtering deposition process, which aims to control the initial layer before the magnetron sputtering deposition. When the discharge power of the linear ion source is 1.2 kW, static deposition rate of Cu and Ni were 7.4 and $3.5{\AA}/sec$, respectively.

• International Journal of Industrial Entomology and Biomaterials
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• v.33 no.2
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• pp.138-143
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• 2016

In the present study, silk fibroin (SF) was dissolved in $CaCl_2/H_2O/EtOH$ solution at $85^{\circ}C$. After the dissolution, the SF solution was cooled down and stored at $4^{\circ}C$ for 28 d. The stability of the solution's viscosity and electrospinnability was observed to examine the stability of SF molecules during storage in $CaCl_2/H_2O/EtOH$ solution. The viscosities of $SF/CaCl_2/H_2O/EtOH$ solution and SF formic acid solution did not change during 28 days' storage of SF in $CaCl_2/H_2O/EtOH$ solution. The electrospinnability of the SF solution, mean diameter of the electrospun SF fiber, and crystallinity index of electrospun SF web did not change, regardless of the length of the storage period. These results imply that SF molecules do not degrade during 28 days' storage in $CaCl_2/H_2O/EtOH$ solution.

• Proceedings of the IEEK Conference
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• 2003.07d
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• pp.1609-1612
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• 2003

We designed and implemented electronic catalog system for 3D CAD using XML. The XML(extensible Markup Language) is a Markup Language to describe data structure. XML was originally designed to meet the challenges of large-scale electronic publishing. XML Is also playing an increasingly important role in the exchange of a wide variety of data on the Web and elsewhere. This XML catalog helps you easily create and edit the construction materials data. If you want to obtain informations from the construction materials data which is used by object-oriented 3-D CAD program then this system helps you.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2001.10a
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• pp.17-20
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• 2001

This paper presents the results of an elastic buckling analysis of elastically restrained orthotropic plate with a longitudinal stiffener under in-plane linearly distributed load. It is assumed that the loaded edges of web plate are simply supported and other two edges are elastically restrained against rotation. The stiffener is modeled as a beam element and its torsional rigidity is neglected. For the buckling analysis Lagrangian multiplier method is employed. The effects of restraint and longitudinal stiffener are presented in a graphical form.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2005.04a
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• pp.76-79
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• 2005

Bending deformation and energy absorption characteristics of aluminum-composite hybrid tube beams have been analyzed for improvement in the bending performance of aluminum space frame by using experimental tests combined with theoretical and finite element analyses. Hybrid tube beams composed of glass fabric/epoxy layer wrapped around on aluminum tube were made in autoclave with the recommended curing cycle. Basic properties of aluminum material used for initial input data of the finite element simulation and theoretical analysis were obtained from the true stress-true strain curve of specimen which had bean extracted from the Al tube beam. A modified theoretical model was developed to predict the resistance to the collapse of hybrid tube beams subjected to a bending load. Theoretical moment-rotation angle curves of hybrid tube beams were in good agreement with experimental ones, which was comparable to the results obtained from finite element simulation. Hybrid tube beams strengthened by composite layer on the whole web and flange showed an excellent bending strength and energy absorption capability.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.105-109
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• 2008

자동차, 항공기, 철도차량, 선박 등의 제품개발에 필요한 일련의 엔지니어링 활동들을 유기적으로 연결하고 통합하기 위해서는 엔지니어링 협업(비지니스 프로세스)을 처리하기 위한 시스템이 요구된다. 엔지니어링 프로세스 협업을 구성하는 엔지니어링 서비스는 일반적인 웹 서비스와 비교할 때 상대적으로 긴 응답시간과 높은 실행비용 등에서 차별화 된다. 본 논문에서는 서비스 조합에 수치해석 특성, 서비스 크기 등의 엔지니어링 서비서의 특성들을 반영시켜 제한된 시간과 비용을 만족하는 엔지니어링 프로세스 협업을 처리할 수 있는 웹 서비스 조합 시스템을 제안하였다. 또한 서비스 조합 모델링 단계에서 QoS 기반 서비스 선택 액티비티와 서비스 조합 실행 단계에서 서비스 선택 알고리즘을 제시하였다.