• Title, Summary, Keyword: Core Technology

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An Experimental Study on the Motor-Core Die Development of HEV Traction Motor (하이브리드(HEV) 구동 모터용 모터-코어 금형 개발에 관한 실험적 연구)

  • Hong, Kyeong-Il;Kim, Se-Hwan;Choi, Kyeo-Gwang;Jung, Hyun-Suk;Lim, Se-Jong
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.9 no.2
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    • pp.34-37
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    • 2015
  • The HEV Traction Motor Core manufacturing technology is a core component of HEV Traction Motor Core (Iron Core) is a key technology for the manufacture of eco-friendly automotive industry is essential for the competitiveness of the country must obtain the technology. In this study, the HEV Motor Core of the Rotor manufacturing technology, the Stator manufacturing technology applied to Press Lamination Die and Core(Iron Core) was developed and the results are discussed.

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Analysis of Influencing Factors of Cyber Weapon System Core Technology Realization Period (사이버 무기체계 핵심기술 실현시기의 영향 요인 분석)

  • Lee, Ho-gyun;Lim, Jong-in;Lee, Kyung-ho
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.27 no.2
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    • pp.281-292
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    • 2017
  • It is demanded to promote research and development of cyber weapons system and core technology in response to the ongoing cyber attack of North Korea. In this paper, core technologies of the future cyber weapon system are developed and the factors affecting the realization timing of core technologies were analyzed. 9 core technology groups and 36 core technologies are derived. Afterwards, these core technology groups are compared to the operation phase of the joint cyber warfare guideline and the cyber kill chain of Lockheed Martin. As a result of the comparison, it is confirmed that the core technology groups cover all phases of the aforementioned tactics. The results of regression analyses performed on the degree of influence by each factor regarding the moment of core technology realization show that the moment of core technology realization approaches more quickly as factors such as technology level of the most advanced country, technology level of South Korea, technology transfer possibility from the military sector to the non-military sector(spin-off factor), and technology transfer possibility from the non-military sector to the military sector(spin-on factor) increase. On the contrary, the moment of core technology realization is delayed as the degree at which the advanced countries keep their core technologies from transferring decrease. The results also confirm that the moment of core technology realization is not significantly correlated to the economic ripple effect factor. This study is meaningful in that it extract core technologies of cyber weapon system in accordance with revision of force development directive and join cyber warfare guideline, which incorporated cyber weapon system into formal weapon system. Furthermore, the study is significant because it indicates the influential factor of the moment of core technology realization.

An Experimental Study on the HEV/EV Traction Motor Rotor Core in Injection Molding Analysis (사출성형해석을 이용한 HEV/EV 구동모터 회전자 철심에 관한 실험적 연구)

  • Hong, Kyeong-Il;Jung, Hyun-Suk;Choi, Kyeo-Gwang;Kim, Se-Hwan;Lim, Se-Jong
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.9 no.1
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    • pp.9-13
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    • 2015
  • The HEV/EV Traction Motor Core manufacturing technology is a core component of Traction Motor Core is a key technology for the manufacture of eco-friendly automotive industry is essential for the competitiveness of the country must obtain the technology. This study was performed to develop a Rotor Core of the HEV/EV Traction Motor using the first time in Korea multi-gate BMC injection molding technique. Executed by the experiment of this study are as follows. Study 1: Developed a multi-gate BMC injection mold for the magnet fixed to the Rotor Core. Study 2: Developed a production implementation and manufacturing technology of the Rotor Core. In this study, the develop products and manufacturing technologies implemented by the BMC injection mold development for Magnet fixed to the Rotor Core and the results are discussed.

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Study on Thermal Treatment of Hybrid Technical Yarns

  • Ishtiaque, S.M.;Das, A.
    • Fibers and Polymers
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    • v.5 no.1
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    • pp.25-30
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    • 2004
  • The present paper reports the impact of thermal treatment on the characteristics of core-sheath type hybrid technical yarns. The core-sheath type hybrid yams are prepared using DREF-III technology. Polyester and glass multifilaments are used as core components whereas the cotton and polyester staple fibers are the sheath components wrapped around the core filament with different proportions to form a hybrid structure. The thermal treatment is carried out both in dry and in wet state under relaxed condition and the thermal shrinkage, sheath-slipping resistance and tensile and bending properties of hybrid yarns have been studied. Thermal treatment markedly increases the thermal shrinkage and sheath-slipping resistance of hybrid yarns with polyester multifilament in core, but insignificant effect for yarns with glass multifilament in core. Breaking elongation of hybrid yams with polyester multifilament in core increases with treatment temperature. The hybrid yarns with glass multifilament in core are least affected by thermal treatment.

Analysis of Back EMF and Torque in Interior Permanent Magnet BLDC Motors (INTERIOR 영구자석 BLDC MOTOR의 역기전압과 토오크에 관한 분석)

  • Sung, Bu-Hyun;Ku, Ja-Nam;Kim, Chang-Jun;Lee, Jin-Won;Kim, Sung-Min;Bae, Gun-Woong
    • Proceedings of the KIEE Conference
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    • pp.877-879
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    • 1995
  • In this study, we developed the efficient brushless DC motor for a compressor of air conditioner. The characteristics of motor are under the control of the material of some parts and the shape of magnet. Especially we compared the interior shape to the surface shape of the magnet. And we optimized the parameters like the temperature and the materials of magnet and core by tool for more efficient motor.

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Blazed $GxL^{TM}$ Device for Laser Dream Theater at the Aichi Expo 2005

  • Ito, Yasuyuki;Saruta, Kunihiko;Kasai, Hiroto;Nishida, Masato;Yamaguchi, Masanari;Yamashita, Keitaro;Taguchi, Ayumu;Oniki, Kazunao;Tamada, Hitoshi
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.556-559
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    • 2006
  • We successfully developed a high performance and highly reliable blazed GxL device with a high optical efficiency and a high contrast ratio. The device demonstrated superior resistance against a high power laser, which is suitable for a large-area laser projector. We operated the world's largest laser projection screen using this device at the 2005 World Exposition in Aichi, Japan, problem free.

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A Study on The Thickness Shrinkage of Injection Molded Parts with The Variation of Injection Mold Core and Molding Materials (사출금형코어 및 성형수지 변화에 따른 두께 방향 수축률에 관한 연구)

  • Shin, Sung-Hyun;Jeong, Eui-Chul;Kim, Mi-Ae;Chae, Bo-Hye;Son, Jung-Eon;Kim, Sang-Yoon;Yoon, Kyung-Hwan;Lee, Sung-Hee
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.13 no.2
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    • pp.17-21
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    • 2019
  • In this study, selective laser sintered 3D printing mold core and metal core were used to investigate the difference of the thickness shrinkage from the gate of the injection molded part at a constant interval. SLS 3D printing mold core was made of nylon-based PA2200 powder and the metal core was manufactured by conventional machining method. As the PA2200 powder material has low strength, thermal conductivity and high specific heat characteristics compared with metal, molding conditions were set with the consideration of molten temperature and injection pressure. Crystalline resin(PP) and amorphous resin(PS) with low melting temperature and viscosity were selected for the injection molding experiment. Cooling time for processing condition was selected by checking the temperature change of the cores with a cavity temperature sensor. The cooling time of the 3D printing core was required a longer time than that of the metal core. The thickness shrinkage of the molded part compared to the core depth was measured from the gate by a constant interval. It was shown that the thickness shrinkage of the 3D printing core was 2.02 ~ 4.34% larger than that of metal core. In additions, in the case of metal core, thickness shrinkage was increased with distance from the gate, on the contrary, in the case of polymer core showed reversed aspect.

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An Analysis on the Selection Process of Core Wireless Communications Technologies in Korean National IT R&D Program

  • Ilsue Roh;Lee, Byoung-Nam;Lee, Jungman
    • Proceedings of the IEEK Conference
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    • pp.1320-1323
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    • 2002
  • This paper reviews the Korean government’s selection process of core wireless communications technologies, and presents technology trends, perspectives and strategies of 5 core technologies to develop in wireless communications areas based on the mid term IT technology development plan(2002∼2004). Delphi Panel Method and Analytic Hierarchy Process(AHP) Analysis were adapted to select 30 core technologies in 9 strategic areas. Especially, 5 core wireless communications technologies out of 24 required technologies are selected: 4 G Core Technology, Broadband Wireless Access Network Technology, IMT-2000 Plus STP Technology, OBP Based Multimedia Satellite Communications Technology, Stratosphere Communications System Technology. Strategic national IT R&D program has been essential to continue success story of CDMA technology, and acquiring technology independency from advanced nations. In long term perspectives, a strategy of intensive investment with prudent selection onto core technologies should be deployed in the IT R&D programs. Also, the national IT R&D programs should be limited in the high risk & high returen areas where only government can afford the failures as well as better spill over effects are expected for the technology development and national economy. Korean industry has some strength in wireless communications technology area. Therefore, more policy concerns should be given into this area not only to secure present strength but also to explore better technology competitiveness.

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