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- 저자 : 宋永俊 (검색결과 421 건)
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Effects of Magnetovolume and Spin-orbit Coupling in the Ferromagnetic Cubic Perovskite BaRuO3
송영준,이관우 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
BaRuO3 having five different crystal structures has been synthesized by varying the pressurewhile sintering. Contrary to the other phases being nonmagnetic, the cubic perovskite phase synthesizedrecently shows an itinerant ferromagnetic character. We investigated this ferromagneticBaRuO3 using first principles calculations. A few van Hove singularities appear around the Fermienergy, causing unusually high magnetovolume effects of M/a 4.3 µB/°A as well as a Stonerinstability [IN(0) 1.2]. At the optimized lattice parameter a, the magnetic moment M is 1.01µB in the local spin density approximation. When spin-orbit coupling is included, the topologies ofsome Fermi surfaces are altered, and the net moment is reduced by 10% to a value very close to theexperimentally observed value of 0.8 µB. Our results indicate that this ferromagnetism is inducedby the Stoner instability, but the combined effects of the p − d hybridization, the magnetovolume,and the spin-orbit coupling determine the net moment. In addition, we briefly discuss the resultsof the tight-binding Wannier function technique.
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디지털 셀룰라 시스템을 위한 개선된 GMSK 직교 변조기의 설계
송영준,한영열 대한전자공학회 1996 전자공학회논문지-A Vol.33 No.6
We propose the improved GMSK (gaussian-filtered minimum shift keying) quadrature modulator using the FIR(finite impulse response )filter whose coefficients are obtained form the differnce of phase response, and design its ASIC (applicaton specific integrated circuit) which can be used for GSM (global system for mobile communication) digital cellular system and DCS 1800 (digital cellular system at 1800MHz) personal communication system. Input data become quantized I and Q channel 10 bit signal through cosine and sine ROM mapping after being filtered by the FIR filter whose normalized bandwidth is 0.3 and designed by considering intersymbol interference as well as sampling ratio. These two signals become the GMSK modulated I and Q channel signal through DAC (digital-to-analog converter) and 7th order analog chebyshev LPF(low pass filter) respectively. The difference between the ideal analog signal and its digitized signal is analyzed in terms of sampling noise, quantization noise, truncation noise and coefficient noise. And the effect of the LPF following the DAC is considered. The ASIC design of the GMSK quadrature modulator is also confirmed by an experiment.
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宋永俊 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.1
Modern literature of Korea came from Europe. However, Modern literature of Korea was rather much from Japan than that from Europe directly. Accordingly, such was Romantic literature. Therefore, Romantic literature of Korea was not that of Europe, but Romantic literature through the influence of Japan. And then Romantic literature of Korea arose and was developed through the influence of Japanese Romantic literature. Seeing the following facts were proved, we realized the above said. 1) As the tradition of classics did not exist in Korea at that time, we cannot see that Romanticism started from the reaction of Classicism. This is true of Japanese modern literature. 2) The period of Romantic literature developed was short, not long time like Romantic literature of Europe matured during long period. And in that period Romanticism was mixed with illuminism, realism, and naturalism. Therefore, it is difficult to establish the Romantic age. We can see that there was the same fact in Japan. 3) Romanticism with naturalism came into Korea. Therefore, it is difficult to sort out pure Romanticism. This fact is the same in Japan. 4) The poetry is given more weight than the prose in Romantic literature in substance. [n spite of taking the view into consideration, it was put emphasis too much on the poetry than the prose. This was true of the case in Japan. 5) Romanticism, demoralized, naive sentimentalism, had developed in 1920. This was the event under the influence of Decadent literature of Japan, not because of the failure of the March 1, 1919, Independence Movement. 6) At this time the revival of 「sijo」 (a three-versed Korean ode) came out, and we think that the event arose from traditional 「Tanga」 (Japanese traditional short poem), or 「Haiku」 (Japanese traditional most short poem) came under the influence of Romantic literature of Japan.
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DMF를 이용한 디지털 셀룰라 DS/CDMA 시스템의 고속 동기 시스템 구현
송영준,한영열 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.5
In this paper, we evaluated the mean acquisition time and it's variance of the rapid synchronization system using the DMF(Digital Matched Filter) under the DS/CDMA system which uses the long period PN code. And we implemented the synchronization system that satisfies the specification demanded by the proposed EIA/TIA Interim Standard of Qualcomm Company. We showed that the state of the PN spreading code was estimated using the DMF(Digital Matched Filter) and then exact and fast chip synchronization could be achieved by the early-late tracking loop in the multiple channel environment. And we suggested the possibility that this synchronization system could be useful in the emerging digital cellular DS/CDMA system.
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宋永俊 大田工業大學 1990 한밭대학교 논문집 Vol.7 No.2
흔히 '高麗의 노래'라고 말하지만, 靑山別曲類는 사실은 高麗 훨씬 前부터 있어 왔고 오늘날까지 도 있으며, 翰林別曲類의 全盛期는 高麗 때가 아니라 朝鮮朝 初였다. 따라서, 筆者가 連歌라고 하는 것은 鄕歌를 계승한 것이 아니라 鄕歌와 對立하였다. 鄕歌는 前句가 後句가 붙음으로써 單章體 短歌가 되고, 連歌는 後斂句가 基本句에 붙음으로써 連章體 長歌가 된다. 그런데 이 短·長歌의 對立構造는 麗代뿐만 아니라 韓國文學史의 全時期에 걸쳐 存在하는 것처럼 보이고, 따라서 韓國 詩歌의 가장 큰 特色이며, 이를 떠나서 韓國 詩歌를 바르게 파악할 수 없다. 그리고 이른바 高麗歌謠와 景幾體歌는 장르論으로 보아 하나는 上位의 장르類, 하나는 下位의 장르種이어서 同位가 아니며, 後斂句가 基本句에 붙는 本質的 特徵에 의하여 똑같이 하나의 '連歌'라는 장르類를 이루며, 그 下位槪念으로서 單句後斂句, 復句後斂句라는 장르種을 이룬다. 後句가 붙으면 鄕歌類의 單章體가 되며, 後斂句가 基本句에 붙으면 連歌類의 聯章體가 되게 마련이다. 文學史에서는 무엇보다 各 文學 장르의 '構造的인 把握'이 重要하다. 다시 말하면, 韓國의 連歌는 短·長歌의 對立構造를 이루고, 短歌는 鄕歌·時調가, 長歌는 連歌가 代表하며, 連歌에는 1句後斂句~4句後斂歌가 있는데, 이른바 俗謠는 主로 1句後斂歌 景幾體歌 는 句後斂歌에 든다. 鄕歌는 前句+後句'의 短歌이며, 歌는'基本句+後斂句'의 長歌이다.
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