http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
나노 연/경자성 분말 재료를 이용한 Exchange-coupling 자석의 제조 기술
김종렬(Jongryoul Kim),조상근(Sang-Geun Cho),전광원(Kwang-Won Jeon) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.6
Magnetic materials has been applied to various fields due to their energy convertible properties between electrical and mechanical energy. Particularly, permanent magnets have been currently attracted much attention because they produce external magnetic field without any electrical current. For high efficiency, a demand for permanent magnets containing rare earth elements has been continuously increased, which abruptly raises the price and causes the supply difficulty of rare earth materials. Therefore, the development of permanent magnets with less or without rare earth elements become a urgent issue. In this report, the current trend and major issues on high efficiency permanent magnets, particularly exchange-coupling magnets, are discussed.
남궁석(Seok Namkung),조상근(Sang-Geun Cho),김진배(JinBae Kim) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.6
High performance permanent magnets have become the subject of considerable attention because of the potential applications in the traction motors of hybrid and electric vehicles and wind generators. Nd-Fe-B magnets have attracted considerable interest due to a large maximum energy product. However, Nd-Fe-B magnet cannot be used in high temperature (~200 ℃) applications due to the thermal degradation of coercivity. Therefore, the development of high coercivity Nd-Fe-B permanent magnet is a challenging issue. In case of high coercivity Nd-Fe-B permanent magnet, an increment in the intrinsic coercivity can be easily achieved by substituting Nd atoms with Dy or Tb atoms. However, these heavy rare-earth elements are known to cause a decrease in remanence due to the antiferromagnetic coupling between Dy and Fe atoms. In addition, Dy is relatively expensive and being limited in quantity. Hence, a new technology that can increase the coercivity of Nd-Fe-B sintered magnet using only a small amount, or even, no amount of heavy rare-earth elements is being investigated. This article describes the research trend in reducing the heavy rare-earth elements in Nd-Fe- B magnets.
4차 산업혁명 시대의 모자이크 전쟁 - 미군의 군사혁신 방향과 한국군에 주는 함의
남두현 ( Nam Doo-hyeon ),임태호 ( Im Tae-ho ),이대중 ( Lee Dae-jung ),조상근 ( Cho Sang-geun ) 국방대학교 안보문제연구소 2020 국방연구 Vol.63 No.3
본 논문은 미군의 새로운 미래전 개념인 모자이크 전쟁의 개념과 등장 배경, 주요 특징 및 기존 작전개념과의 관계를 분석함으로써 종합적인 이해를 도모하고 한국군에 주는 함의를 도출하여 군사 선진국의 미래전 개념에 대한 발전적 수용을 제안하는데 그 목적을 두고 있다. 모자이크 전쟁이란 미국의 방위고등연구계획국(DARPA)에서 제시한 미래전 개념으로써 AICBM(인공지능, 사물인터넷, 클라우드, 빅데이터, 모바일)으로 대표되는 4차 산업혁명의 주요 기술을 군사분야에 접목시켜 “군사작전을 소모중심(Attrition Centric)에서 결심중심(Decision Centric)으로 전환하고 네트워크화된 다양한 전력을 분산하여 전장 상황에 맞게 적절히 조합, 신속하게 대응하는 전쟁 수행방식”을 말한다. 미군의 군사혁신 방향을 제시하고 있는 모자이크 전쟁은 초연결, 초지능화, 융복합을 기반으로 레고 전쟁, 분산되고 적응력 있는 전력 운용, 상황 중심의 C3 체계를 주요 특징으로 하고 있다. 워게임을 통해서 그 효용성이 입증된 모자이크 전쟁은 ASB, JOAC, JAM-GC 등과 같은 미군의 기존 작전개념을 대체하는 것은 아니지만 각 군의 작전수행개념을 기술적 측면에서 지원하고, 노력을 통합함으로써 예산을 효율적으로 운용할 수 있도록 뒷받침하고 있다. 최근 우리 군에서도 모자이크 전쟁에 대한 관심이 뜨겁다. 우리 군은 미군의 미래전 개념을 무분별하게 적용하기보다는 한국군 특색에 맞게 선별적으로 수용하고, 모자이크 전쟁으로 인한 미군 무기체계의 변화를 주목하며, 미국과 중국의 군사경쟁 고조에 따른 준비를 진행하는 등 지혜를 발휘해야 할 것이다. Mosaic warfare is a concept of future war presented by the U.S. DARPA(Defense Advanced Research Projects Agency). It combines the key technologies of the 4th Industrial Revolution, represented by AICBM(AI, Internet of things, cloud, Big data, Mobile) into the military sector, converting military operations from Attrition Centric to Decision Centric and dispersing various networked powers. The Mosaic Warfare, which suggests the direction of the U.S. military innovation, features the LEGO War, distributed and adaptive power management, and a situation-oriented C3 system based on hyper-connectivity, super-intelligence, and convergence. The Mosaic Warfare, which proved its effectiveness through war games, does not replace the existing U.S. military operational concepts such as ASB, JOAC, JAM-GC, etc. But, it effectively manages the budget by integrating efforts and supporting each army's operational concept in terms of technology. Recently, our military interest in Mosaic Warfare has increased. Rather than indiscriminately applying the concept of the future war of the U.S. military, the Korean Military should selectively accepts by considering the characteristics of the Korean Military. Also, we should pay attention to the changes in the arms system of the U.S. military due to the Mosaic warfare and show wisdom by preparing for the heightened military competition between the United States and China.
홍상근,최송석,신동조,임재문,Hong, Sang-Geun,Choi, Song-Suk,Shin, Dong-Cho,Lim, Jae-Moon 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.5
A modern artillery use a FMCW Proximity Fuze for effectively target destruction. FMCW Proximity Fuze can be deceived by Jamming Technique because it uses RF for distance estimation. FMCW Proximity Fuze algorithm is similar to FMCW radar's, but normal Jamming Tech. like Noise and Mulitone is useless. Most Shots with FMCW Proximity Fuze have a additional mechanical fuze against RF Jamming. Shots explode by mechanical fuze when Proximity Fuse is Jammed. However, distance Deception is available because shots can not distinguish between deception jamming signal and ground reflected signal. For making Distance Deception Jamming, FMCW signal tracking is demanded. In this paper, we propose a FMCW tracking method and develop the Jammer to show Jamming signal.