• Journal of the Korean Society of Industry Convergence
• /
• v.6 no.3
• /
• pp.261-266
• /
• 2003

이 논문에서는 반능동 진동 흡수기를 통합 시트/섀시 현가 장치에 확대, 적용하여 그 성능을 조사하였다. 통함 현가시스템의 성능분석을 위해 집중 인체질량과 함께 실험적으로 입증된 한 비선형 시트 쿠션 모델을 도입하였다. 또한 3 자유도 시트/섀시 현가시스템의 효과적인 진동제어를 위해 리아푸노브 바이스테이트 제어법칙을 사용하였다. 시뮬레이션결과 반능동 통합 현가장치는 시트 쿠션 모델과 관계없이 운전자의 승차감과 관련 있는 시트의 절대가속도 크기와 시트쿠션의 시트 트랙에 대한 상대변위를 상당히 감소시킬 수 있음을 알 수 있었다. 그러나, 주로 사용되어온 선형 쿠션 모델을 사용한 경우보다 비선형쿠션 모델을 사용한 경우의 제진성능이 약간 저조함을 알 수 있었다. 따라서, 자동차 시트 설계시 성능분석을 위해서는 실제의(비선형의) 시트 쿠션 특성을 적용해야 함을 알 수 있다.

• Science of Emotion and Sensibility
• /
• v.2 no.2
• /
• pp.11-16
• /
• 1999

본 연구는 한국인들이 선호하는 열차용 시트 디자인에 대한 감성특성을 파악하고 이를 실제 디자인으로 구체화하고자 실시되었다. 시트 디자인의 감성평가를 위해 형용사들을 추출하였고, 이를 이용하여 한국인들이 기대하는 열차용 시트 디자인의 감성특성을 조사하였다. 여기서 추출된 감성특성을 실제 디자인으로 보다 쉽고 구체화시키기 위하여, 특징적인 시트 디자인들을 시각적인 그림으로 제시하고, 각각에 대한 감성특성 및 선호도 평가를 실시하였다. 이러한 결과들을 종합하여 선호되는 시트 디자인의 감성특성과 이러한 감성특성과 관련을 가지는 실제 디자인 특징에 대하여 분석하였다. 이를 토대로 새로운 시트들을 디자인하여 2차 디자인 평가를 실시하였고, 가장 선호되었던 디자인을 최종 디자인 대안으로 결정하였다.

• Composites Research
• /
• v.25 no.5
• /
• pp.154-158
• /
• 2012

The effect of structure on the sound absorption and sound transmission loss of composite sheet was investigated. A sheet of polypropylene was bonded by hot press with nonwoven fabric sheets of polyethylene terephthalate on the top side and the back side. Absorption coefficient of composite sheet using nonwoven fabric with surface density of $0.64kg/m^2$ was 0.1-0.2. It is 100-400% improvement compare to that of polypropylene sheet. The transmission loss of composite sheet was increased with surface density of polypropylene board and introduction of hemisphere hole on the surface of sheet. Two types of composite sheet were made using flat sheet and sine wave shaped sheet and the effect of sheet structure on the transmission loss was investigated.

• Journal of KIISE:Software and Applications
• /
• v.30 no.11
• /
• pp.1102-1111
• /
• 2003

Spreadsheet is one of the most widely used programming tool because of its ease of use, however there have been few researches on applying object-oriented techniques in developing spreadsheet applications. Generally, spreadsheet applications contain a lot of errors, and spreadsheet has some drawbacks such as low reusability and hard maintenance. In order to solve these problems, we introduce an object-oriented spreadsheet system, named XCEL. It enables users to develop applications using systematic techniques with data modelling method, and allows users to apply object-oriented technologies to spreadsheet programming. The data modelling method allows to define classes using XML and flowchart, and the spreadsheet represents an object with contiguous cells. XCEL has advantage that users can apply object-oriented technology to spreadsheet programming.

• The Science & Technology
• /
• v.32 no.4 s.359
• /
• pp.30-31
• /
• 1999

대덕연구단지 내에 자리잡은 한국표준과학연구원의 박세진박사팀은 최근 대원산업의 시트연구실과 공동으로 운전자의 체형을 자동감지하는 자동차시트 개발에 성공했다. 박박사팀이 이번 개발한 자동체형감지시트는 운전자가 시트에 앉았을때 가장 편안한 운전자세를 유지할 수 있도록 시트의 위치 및 각도가 운전자의 신체특성에 따라 자동으로 조절되는 인공지능형 자동시트로 지난 3월 특허출원을 마치고 상용화를 준비중이다.

• Journal of the Korean Magnetics Society
• /
• v.20 no.4
• /
• pp.143-148
• /
• 2010

This study examined the effects of sheet thickness on electromagnetic wave absorption characteristics and internal microstructure in 92.6%Fe-6.5%Si-0.9%Cr (wt%) alloy flakes/polymer composite sheets available for quasi-microwave band. The composite sheets with the thickness of 0.3, 0.4 and 0.5 mm were prepared by tape casting. A significant decrease in transmission parameter $S_{21}$ and a large increase in power loss were observed for the thick composite sheet in the frequency range of 1~5 GHz. However the permeability properties were not affected by thickness variation, while the imaginary part of complex permittivity increased with the increase of sheet thickness at 1~5 GHz. The enhanced electromagnetic wave absorption characteristics in the thicker composite sheets was attributed to the changed microstructure and the higher dielectric loss.

• The Journal of the Convergence on Culture Technology
• /
• v.5 no.4
• /
• pp.361-366
• /
• 2019

Exchanging sheets for patients is one of the worst and one of the factors that makes the nursing environment difficult. Many beds with various functions for the patient have already been developed, but there is no device for automatically changing the sheets. In this study, we developed and tested the first automatic sheet changer for a medical bed and verified its performance. The developed automatic seat changer uses a torque limiter to properly adjust tension and exchange a dirty sheet and a new seat at the same time. The designed automatic sheet changer was experimentally confirmed to be properly operated and installed in a integrated multi-functional bed with bed sores prevention and automatic patient transfer functions.

• Journal of the Korea Convergence Society
• /
• v.11 no.6
• /
• pp.83-88
• /
• 2020

Recently, radiation shielding sheets made of eco-friendly materials have been widely used in medical institutions. The shielding sheet is processed into a solid form by thermoforming by mixing a shielding material with a polymer material. The base is resin-based and has a limit in tensile strength, and for this purpose, fibers such as non-woven fabrics are used on the surface. The shielding sheet process technology has a problem in that the tensile strength rapidly decreases when the content of the shielding material is increased to increase the shielding performance. In order to improve this, this study intends to compare and evaluate the method of laminating and coating the fibers in the sheet process. In comparison of the three types of sheets, there was no difference in shielding performance between the fiber-coated sheet and the compression sheet, but there was a large difference in tensile strength.

• School Mathematics
• /
• v.13 no.3
• /
• pp.363-384
• /
• 2011

This study is based on the recognition that the school mathematics education should reinforce the heuristic and constructional aspects related with discoveries of mathematical rules and understanding of mathematical concepts from real world situations as well as the deductive and formal aspects emphasizing on mathematical contents precisely. The 11th grade students of one class from a city high school with average were chosen. They were given time to learn various functions of Excel in regular classes of "Information Society and Computer" subject. They don't have difficulty using cells, mathematical functions and statistical functions in spreadsheet. Experiment was performed for six weeks and there were two hours of classes in a week. Considering the results of this research, teaching materials using spreadsheets play an important role in helping students to experience probabilistic and statistical reasoning and construct mathematical thinking. This implies that teaching materials using spreadsheet provide students with an opportunity to interact with probabilistic and statistical situations by adopting engineering which can encourage students to observe and experience various aspects of real world in authentic situations.

• Proceedings of the KAIS Fall Conference
• /
• 2008.11a
• /
• pp.446-449
• /
• 2008

본 논문에서는 신규 개발품인 자동 싱킹시트의 구조와 작동원리를 파악하고 새롭게 개발하는 제품에 대한 새로운 성능평가 방안에 관한 연구를 수행하였다. 기존 시트와의 변경 사항을 고려하여 자동 싱킹시트의 개발 단계에서 성능을 평가할 수 있는 항목을 도출 하고자 하였다. 이 는 자동 싱킹시트의 특성상 모터가 부착되고 부품이 변경되는 부를 고려하여 3가지 대표 성능 평가항목인 고정부의 유격, 작동력인 토크, 자동 싱킹시트의 작동시간을 주요 평가항목으로 도출하였다. 또 한 각 항목별 성능평가방법에 대해 적절한 방법을 모색하고 자동 싱킹시트에 대한 성능지수로의 적용방법을 연구하였다.