• Journal of the Korean Magnetics Society
• /
• v.4 no.2
• /
• pp.188-191
• /
• 1994

최근 FA, OA 및 공작기계 등의 메카트로닉스 분야와 첨단산업의 눈부신 성장에 따라 그 요소 부품인 소형 모터의 중요성이 점차 강조되고 있다. 특히, 성력화와 시스템의 고성능화 및 경박단소화의 필요성으로 인해 그 구동원인 모터의 고효율화 및 소형경량화가 요구되고 있다. 또한, 근래의 영구자석 재료를 비롯한 소재분야의 발전과 정밀가공 및 제작기술의 발달로 인해 과거보다 우수한 성능을 갖는 정밀 소형 모터의 제작이 가능해지면서 이를 뒷받침하기 위한 보다 정확한 모터특성 해석 및 최적설계의 필요성이 절실하게 요구되고 있다. 본고에서는 소형모터의 해석 및 설계에 대한 비전문가들의 이해를 돕기 위하여 자기 등가회로를 이용 한 해석적인 방법과 수치해석적인 방법에 의한 모터 자기장 해석방법을 소개한다. 그리고 기존의 모터설 계 및 최적설계에 대한 현재까지의 연구결과 및 동향과 앞으로의 전개방향에 대해서 고찰하도록 한다.

• Proceedings of the KSR Conference
• /
• 2002.10b
• /
• pp.741-751
• /
• 2002

21세기 무한경쟁시대에 대비하여 국가산업의 경쟁력제고는 물론 지역의 균형발전을 위해 추진하고 있는 경부고속철도 건설사업은 2004년 4월 개통을 목표로 마무리 단계에 접어들었다. 경부고속철도 건설사업을 통하여 우수하고 완벽한 성능의 고속열차도입과 함께 첨단기술을 이전받아 기술수준을 향상시켰고 G7 연구개발 사업으로 시속 350Km급의 차세대 차량을 설계, 제작할수 있는 능력을 보유하게 되었다. 철도는 육로 교통수단과 달리 시스템적 특성이 매우 강하다. 즉 토목, 건축, 기계, 전기, 전자 등 각 분야의 균등한 기술발전을 도모하여야 철도선진국에 진입할 수 있으며 해외 진출이 가능하다. 사업 추진과정에서 습득한 각종 기술은 향후 건설사업의 독자적 추진을 가능케 하였으며, 철도차량의 제작사뿐만 아니라 부품업체가 해외시장을 개척할 수 있는 능력을 갖추어 철도 선진국으로 도약할 수 있는 기틀을 마련하였다.

• Journal of Adhesion and Interface
• /
• v.22 no.3
• /
• pp.106-110
• /
• 2021

Recently, research using waste among eco-friendly materials has been attracting attention. In this study, we investigated the physical properties of blends in which high density polyethylene (HDPE) was filled with waste gypsum (CaSO₄) generated during fertilizer manufacturing. Composites were prepared by adding the gypsum content 0~20 wt% using a twin screw extruder. The mechanical, rheological, and thermal properties of the composites were evaluated. It was found that the tensile strength of the composites was less than 4.1% compared to that of unfilled HDPE, so there is no significant deterioration in physical properties. The thermal stability of the composites was improved as the gypsum content increased and the gypsum content had little effect on the viscosities of the composites.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.3 no.1
• /
• pp.104-117
• /
• 1999

The Composite materials has been used in the field of high technology industry because of high specific stiffness and high specific strength. Specially, the composite materials has been widely applied to the field of the aircraft and the transportation by the effectiveness of light weight due to low specific weight and reduction of the parts due to bonding, molding and so on. These advantages about the composite have led to study and apply in the transmission shaft for the aircraft and the drive shaft for the automobile. The composite material propeller shaft with the high vibrational stability was designed and analyzed. In order to verify the analysis, two types of experimental test which are the FFT analyzer with impact hammer and the rotational equipment were applied.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.21 no.4
• /
• pp.60-69
• /
• 2022

To keep pace with Industry 4.0, it is imperative for companies to redesign their working environments by adopting robotic automation systems. Automation lines are facilitating the latest cutting-edge technologies, such as 3D vision and industrial robots, to outdo competitors by reducing costs. Considering the nature of the manufacturing industry, a time-saving workflow and smooth linkwork between processes is vital. At Dellics, without any additional new installation in the automation lines, only a few improvements to the working process could raise productivity. Three requirements are the development of gripping technology by utilizing a 3D vision system for the recognition of the material shape and location, research on lighting projectors to target long distances and high illumination, and testing of algorithms/software to improve measurement accuracy and identify products. With some of the functional requisites mentioned above, improved robotic automation systems should provide an improved working environment to maximize overall production efficiency. In this article, the ways in which such a system can become the groundwork for establishing an unmanned working infrastructure are discussed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2009.05a
• /
• pp.829-832
• /
• 2009

Recently, IT-centered convergence between different industries has undergone rapid expansion, accompanied by major advances in u-IT development and digital convergence. Notably, in the automotive-IT convergence sector, automotive sensors and electronic devices interact closely and intelligently with each other, thereby increasing driver safety and convenience and creating the optimal driving environment. This has led to the generation of value-added for the future-oriented automotive industry. Sensing technologies - which are used to monitor traffic situations and transmit correct information (or warnings) on the road traffic situation to car drivers, and to provide accurate information to road traffic controllers - represent both the birth of high-safety, intelligent automotive technologies and the key to automotive manufacturing. In view of these developments, this paper examines the characteristics and structure of the automotive sensor industry, and outlines the policy implications for the automotive sensor industry with regard to the development of the automotive-IT convergence industry.

• Information and Communications Magazine
• /
• v.25 no.6
• /
• pp.18-24
• /
• 2008

항공분야 산업은 기계/전자/소재/정보통신 등 첨단과학기술이 유기적으로 융합되어 운영되는 대표적인 IT융합산업이다. 특히, 항공기에서 IT기반 기술이 융합되어 적용되는 곳은 조종사의 성공적인 임무수행을 위한 항공기에 탑재된 응용 소프트웨어와 항공전자장비들로 구성된 항공 임베디드 시스템이다. 항공 임베디드 시스템은 항공기의 성능과 직결되고 신규 개발 및 성능 개량 시 필수적으로 개발해야하는 시스템 종속적인 1차 시스템과 시스템 독립적이며 국내외 부품시장에서 구매 가능한 서브시스템인 2차 시스템으로 나눌 수 있다. 최근 기간산업에 IT 활용 비중이 점차 높아짐에 따라 IT가 기간산업의 경쟁력을 좌우하는 핵심 요소로 부상하고 있으나, IT산업은 성장이 점차 둔화되고 있는 실정이다. 지식경제부는 이에 따라 기간산업의 경쟁력을 높이고 IT기반 융합신산업을 창출하기 위해 5대 IT융합 신 산업 창출과제를 발표했다. 5대 과제중의 하나인 국방전력 극대화 사업으로 우리 기술로 개발한 초음속 고등훈련기인 T-50에 탑재되는 임베디드 소프트웨어 및 컴퓨터를 국산화하고 있다. 본 사업으로 비행운용프로그램, 실시간 운영체제, 미들웨어, 임무컴퓨터 및 무장관리컴퓨터 등이 순조롭게 개발될 경우 전량수입에 의존하고 있는 T-50의 1차 시스템을 100% 국산화할 수 있을 것으로 기대되며 수입대체 효과와 유지보수비용 절감으로 약 2조원의 부가가치 창출이 예상된다. 본 논문에서는 현재 개발을 진행하고 있는 항공 임베디드 시스템에 대하여 알아본다.

• Korean Journal of Metals and Materials
• /
• v.48 no.3
• /
• pp.218-224
• /
• 2010

Direct copper electroplating on Mg alloy AZ31B was carried out in a traditional pyrophosphate copper bath containing potassium fluoride. Electrochemical impedance spectroscopy and polarization methods were used to study the effects of added potassium fluoride on electrochemical behavior. The chemical state of magnesium alloy in the electroplating bath was analyzed by X-ray photoelectron spectroscopy. Adhesion of the copper electroplated layer was also tested. Due to the added potassium fluoride, a magnesium fluoride film was formed in the pyrophosphate copper bath. This fluoride film inhibits dissolution of Mg alloy and enables to electroplate copper directly on it. A dense copper layer was formed on the Mg alloy. Moreover, this copper layer has a good adhesion with Mg alloy substrate.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.37 no.2
• /
• pp.141-147
• /
• 2024

The measurement of strain under an electric field has been widely employed to comprehend the fundamental principles of electro-mechanical responses in ferroelectric, piezoelectric, and electrostrictive materials. In particular, understanding the strain properties of piezoelectric materials in response to electrical stimulation is crucial for researching and developing components such as piezoelectric actuators, acoustic devices, and ultrasonic generators. This tutorial paper introduces the components and operational principles of the linear variable differential transducer (LVDT), a widely used displacement measurement device in various industries. Additionally, we present the configuration of an experimental setup using LVDT to measure the strain characteristics of ferroelectric, piezoelectric, or electrostrictive materials under the application of an electric field. This paper includes simple measurement results and analyses obtained through the LVDT experimental setup, providing valuable information on research methods for the electro-mechanical interactions of various materials.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.14 no.1
• /
• pp.151-160
• /
• 1994

Recently, terrestrial photogrammetry has been applied effectively to data acquisition in GIS and to monitoring precise machinery for simulation test. Because 3-D coordinates of many object points can be quickly measured with constant accuracy and easy modeling by this method. In this study, the composition concerned with multi-camera system which simultaneously analyzes structure from multi-station using various cameras was developed. The errors of results were analyzed to investigate the accuracy of the system, error of unknown points and control points, convergent and strip adjustment for optimal network design also. As results of this study, the efficiency of multi-camera system developed here was proved through application to monitoring the entire area of the precise model ship. We could also acquire 3-dimensional coordinates with good accuracy by arranging pass points. Therefore, possibility of measurement of instantaneous deformation as well as precision analysis of structures can be suggested.