• Title/Summary/Keyword: Ultra-Lightweight

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Characteristics of the Functional Panel Made from Foamed Aluminum (발포알루미늄을 이용하여 제조한 기능성 판넬 특성 연구)

  • Kim, Jae-Yong;Um, Myeong-Heon;An, Dae-Hyun;Shim, Myeong-Jin
    • Applied Chemistry for Engineering
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    • v.17 no.1
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    • pp.62-66
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    • 2006
  • In this work, the properties of environmentally friendly functional panel made from waste aluminum were investigated. Product quality enhancement was pursued through an improved viscosity process, a mixing process by agitating, a foaming process, a cooling process, and a color addition process. An acoustic transmission attenuation test, a sound adsorption rate measurement test, and a foaming condition and scrap mixing test were implemented. As a result, the functional panel made from waste aluminum was ultra lightweight and had excellent properties such as soundproof, sound interception, and shielding harmful electromagnetic waves. Also, the functional panel showed low thermal conductivity (about 2.2 kcal/mh) and excellent heat-insulating property.

A Study on Laser Weldability of Al-Si Coated 22MnB5 Steel for TWB Hot Stamping (Al-Si 도금된 22MnB5강의 핫스탬핑 TWB 적용을 위한 레이저용접성 고찰)

  • Kim, Yong;Park, Ki-Young;Lee, Bo-Young
    • Journal of Welding and Joining
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    • v.31 no.2
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    • pp.30-36
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    • 2013
  • Recently the use of ultra high strength steels(UHSS) in structural and safety component is rapidly increasing in the automotive industry. Furthermore, it commonly use in tailor welded blank laser welding process before hot stamping to reduce lightweight vehicle. However TWB process is to be a problem about welded strength after hot stamping because it's welded before heat treatment. Therefore, in this study, laser welds of TWB after heat treatment were analyzed for changes in the characteristics, especially the impact on the oxidation and decarburization in order to prevent pre-coated Al-Si layer welds on the properties for intensive investigation. As a result, the degradation of the TWB weldments changes in the heat treatment conditions alone, without any pre-treatment of the coating layer has confirmed that there is a limitation on the improvement. Furthermore Al-Si elements are overall distributed on the weldment and it specially concentrated along the fusion line. Hardness value of Al-Si segregation area is less than 350Hv and tensile strength showed just 78~83% compared with substrate. Accordingly, we proved that both side Al-Si coating should be removed in order to ensure the strength of the substrate.

Self-filling Trait Light Emotion Friendly Concrete Epidemiological Assessment (자기충전형 고성능 LEFC 역학특성평가)

  • Kim, Tae-Wan;Suh, Seung-Hun;Kim, Soo-Yeon;Kwon, Si-Won;Oh, Sang-Keun;Kim, Byoung-Il
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.25-26
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    • 2018
  • Various concrete material technologies and new materials have been developed in accordance with the advancement of buildings. As part of these new technologies, light transparent concrete, which was invented by Hungarian architect Aron Losonczi and attracted worldwide attention, has a technique of arranging optical fiber inside concrete and transmitting the light from exterior to concrete to show silhouette inside. However, due to many disadvantages, application to the field was limited and commercialization was not easy. In Korea, Light Emotion Friendly Concrete has been developed for commercialization. In order to solve the degradation of construction performance caused by the arrangement of expensive optical fiber, which is pointed out as a disadvantage of translucent concrete, It converts expensive fiber into low cost acrylic rod, easy to arrange, pre-assembled to form and post-cast. Therefore, this study aims to improve the mechanical properties of LEFC and to derive optimal combination.

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A Study on the Development of Electric Resistance Welding of DP780 Grade Steel for Hydroforming Tube (하이드로포밍용 DP780MPa급 강판의 전기저항용접 강관 개발에 관한 연구)

  • Park, Sungpill;Kwon, Yongjai
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.3
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    • pp.279-286
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    • 2015
  • To achieve lightweight design, research & development of various lightweighting technologies such as hydroforming are underway worldwide. In the case of hydroforming, application of ultra high strength steel is essential for weight reduction of the car. However, considering common high-strength carbon steel, it is not suitable to the actual hydroformed parts since the lack of formability. DP steel offers an outstanding combination of strength and formability as a result of their microstructure. DP steel has high strength and good formability but it's difficult to secure stable quality of welding section because of softening of weld section and chemical composition. Therefore, most of companies use LASER welding when making high strength tube. Electric resistance welding is excellent production method for steel tube manufacturing considering the productivity. Optimum electric resistance welding technology is needed to be developed for application of high strength hydroformed parts using DP steel. This study is comprehensive research & development from electric resistance welding to actual formabililty evaluation.

Flexible Electronic Materials Industry Trend (플렉서블 전자소재 산업 동향)

  • Park, J.M.;Lee, S.Y.;Roh, T.M.;Lee, J.I.;Lee, J.H.
    • Electronics and Telecommunications Trends
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    • v.36 no.3
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    • pp.65-75
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    • 2021
  • In the era of the 4th industrial revolution, interest in flexible devices is increasing for information and communication technology electronic products. This is a hot technology field in which competition is intensifying to preoccupy the global market for flexible electronic devices because of the many advantages of ultra-lightweight, flexibility, design diversity, high applicability, and low cost. Some flexible electronic products have been commercialized in Korea, but they are still inadequate in terms of price versus performance, so technology development is required continuously. Particularly, the development of flexible electronic materials is emerging as a key factor for flexible electronic device applications. In this study, we will look into the flexible electronic material technology and industry trends following the trend of flexible technology changes in the display, secondary battery, and solar cell, which has emerged as national core industry and has secured global competitiveness. In addition, I want to introduce the Flexible Electronic Material Center, which was established to foster the flexible electronic material industry.

Implementation of Ultra-Lightweight Block Cipher Algorithm Revised CHAM on 32-Bit RISC-V Processor (32-bit RISC-V 프로세서 상에서의 초경량 블록 암호 알고리즘 Revised CHAM 구현)

  • Sim, Min-Joo;Eum, Si-Woo;Kwon, Hyeok-Dong;Song, Gyeong-Ju;Seo, Hwa-Jeong
    • Proceedings of the Korea Information Processing Society Conference
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    • 2021.11a
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    • pp.217-220
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    • 2021
  • ICISC'19에서 기존 CHAM과 동일한 구조와 규격을 갖지만, 라운드 수만 증가시킨 revised CHAM이 발표되었다. CHAM은 사물인터넷에서 사용되는 저사양 프로세서에서 효율적인 구현이 가능한 특징을 갖고 있다. AVR, ARM 프로세서 상에서의 CHAM 암호 알고리즘에 대한 최적 구현은 존재하지만, 아직 RISC-V 프로세서 상에서의 CHAM 구현은 존재하지 않는다. 따라서, 본 논문에서는 RISC-V 프로세서 상에서의 Revised CHAM 알고리즘을 최초로 구현을 제안한다. CHAM 라운드 함수의 내부 구조의 일부를 생략하여 최적 구현하였다. 그리고 홀수 라운드와 짝수 라운드를 모듈별로 구현하여 필요에 따라 모듈을 호출하여 손쉽게 사용할 수 있게 하였다. 결과적으로, RISC-V 상에서 제안 기법 적용하기 전보다 제안 기법 적용 후에 12%의 속도 향상을 달성하였다.

Development trends of Solar cell technologies for Small satellite (소형위성용 태양전지 개발 동향 및 발전 방향)

  • Choi, Jun Hee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.5
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    • pp.310-316
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    • 2021
  • Conventional satellites are generally large satellites that are multi-functional and have high performance. However, small satellites have been gradually drawing attention since the recent development of lightweight and integrated electric, electronic, and optical technologies. As the size and weight of a satellite decrease, the barrier to satellite development is becoming lower due to the cost of manufacture and cheaper launch. However, solar panels are essential for the power supply of satellites but have limitations in miniaturization and weight reduction because they require a large surface area to be efficiently exposed to sunlight. Space solar cells must be manufactured in consideration of various space environments such as spacecraft and environments with solar thermal temperatures. It is necessary to study structural materials for lightweight and high-efficiency solar cells by applying an unfolding mechanism that optimizes the surface-to-volume ratio. Currently, most products are developed and operated as solar cell panels for space applications with a triple-junction structure of InGaP/GaAs/Ge materials for high efficiency. Furthermore, multi-layered junctions have been studied for ultra-high-efficiency solar cells. Flexible thin-film solar cells and organic-inorganic hybrid solar cells are advantageous for material weight reduction and are attracting attention as next-generation solar cells for small satellites.

Study on Structural Changes and Electromagnetic Interference Shielding Properties of Ti-based MXene Materials by Heat Treatment (열처리에 의한 Ti 기반 MXene 소재의 구조 변화와 전자파 간섭 차폐 특성에 관한 연구)

  • Han Xue;Ji Soo Kyoung;Yun Sung Woo
    • Journal of the Microelectronics and Packaging Society
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    • v.30 no.3
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    • pp.111-118
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    • 2023
  • MXene, a two-dimensional transition metal carbide or nitride, has recently attracted much attention as a lightweight and flexible electromagnetic shielding material due to its high electrical conductivity, good mechanical strength and thermal stability. In particular, the Ti-based MXene, Ti3C2Tx and Ti2CTx are reported to have the best electrical conductivity and electromagnetic shielding properties in the vast MXene family. Therefore, in this study, Ti3C2Tx and Ti2CTx films were prepared by vacuum filtration using Ti3C2Tx and Ti2CTx dispersions synthesized by interlayer metal etching and centrifugation of Ti3AlC2 and Ti2AlC. The electrical conductivity and electromagnetic shielding efficiency of the films were measured after heat treatment at high temperature. Then, X-ray diffraction and photoelectron spectroscopy were performed to analyze the structural changes of Ti3C2Tx and Ti2CTx films after heat treatment and their effects on electromagnetic shielding. Based on the results of this study, we propose an optimal structure for an ultra-thin, lightweight, and high performance MXene-based electromagnetic shielding film for future applications in small and wearable electronics.

A Design Of Compact UHF Module With Double Structure That Can Receive Basic Type Link-K (기본형 Link-K 수신 가능한 이중 구조의 소형 UHF 모듈 설계)

  • Min, Se-hong;Kim, Bok-ki;Kim, Kang-san;Lee, Jong-hyuk;Kim, Jong-sung;Bae, Mun-kwan;Kim, Kil-hun;Lee, Seoung-pil
    • Journal of Advanced Navigation Technology
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    • v.21 no.4
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    • pp.413-421
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    • 2017
  • In this paper, we designed and fabricated a compact UHF receive module for efficient operation such as tactical and operation situation, target location information confirmation, target reset using Link-K(Korean joint tactical data link system). And the effect of target reset was analyzed by simulation. The designed module consists of UHF(ultra high frequency) receiver section, control section, and power distribution section. The UHF receiver section performs frequency down conversion, filtering and automatic gain control, etc. The control section demodulates frequency down-converted signals, extracts information, and performs external interworking. The power distribution section supplies external power, generates and supplies the power required by each section. The fabricated module was dimension of $105{\times}105{\times}80mm$ and weighed 1.10 kg and The receiving distance is more than 50 km.

INNOVATIVE CONCEPT FOR AN ULTRA-SMALL NUCLEAR THERMAL ROCKET UTILIZING A NEW MODERATED REACTOR

  • NAM, SEUNG HYUN;VENNERI, PAOLO;KIM, YONGHEE;LEE, JEONG IK;CHANG, SOON HEUNG;JEONG, YONG HOON
    • Nuclear Engineering and Technology
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    • v.47 no.6
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    • pp.678-699
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    • 2015
  • Although the harsh space environment imposes many severe challenges to space pioneers, space exploration is a realistic and profitable goal for long-term humanity survival. One of the viable and promising options to overcome the harsh environment of space is nuclear propulsion. Particularly, the Nuclear Thermal Rocket (NTR) is a leading candidate for nearterm human missions to Mars and beyond due to its relatively high thrust and efficiency. Traditional NTR designs use typically high power reactors with fast or epithermal neutron spectrums to simplify core design and to maximize thrust. In parallel there are a series of new NTR designs with lower thrust and higher efficiency, designed to enhance mission versatility and safety through the use of redundant engines (when used in a clustered engine arrangement) for future commercialization. This paper proposes a new NTR design of the second design philosophy, Korea Advanced NUclear Thermal Engine Rocket (KANUTER), for future space applications. The KANUTER consists of an Extremely High Temperature Gas cooled Reactor (EHTGR) utilizing hydrogen propellant, a propulsion system, and an optional electricity generation system to provide propulsion as well as electricity generation. The innovatively small engine has the characteristics of high efficiency, being compact and lightweight, and bimodal capability. The notable characteristics result from the moderated EHTGR design, uniquely utilizing the integrated fuel element with an ultra heat-resistant carbide fuel, an efficient metal hydride moderator, protectively cooling channels and an individual pressure tube in an all-in-one package. The EHTGR can be bimodally operated in a propulsion mode of $100MW_{th}$ and an electricity generation mode of $100MW_{th}$, equipped with a dynamic energy conversion system. To investigate the design features of the new reactor and to estimate referential engine performance, a preliminary design study in terms of neutronics and thermohydraulics was carried out. The result indicates that the innovative design has great potential for high propellant efficiency and thrust-to-weight of engine ratio, compared with the existing NTR designs. However, the build-up of fission products in fuel has a significant impact on the bimodal operation of the moderated reactor such as xenon-induced dead time. This issue can be overcome by building in excess reactivity and control margin for the reactor design.