• Korean Journal of Crystallography
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• v.11 no.1
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• pp.46-51
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• 2000

The molecular structures of 2-SC₄H₃CH=NN(H)C/sub 6/H/sub 5/(C/sub 11/H/sub 10/N₂S) and (GaMe₂)₂(2-SC₄H₃CH=NNC/sub 6/H/sub 5/)₂(C/sub 26/H/sub 30/Ga₂N₄S₂) have been determined by X-ray diffraction. Crystallographic data for 2-SC₄H₃CH=NN(H)C/sub 6/H/sub 5/:orthorhombic space group P2₁2₁2₁, a=6.108(1)Å, b=7.593(1)Å, c=22.356(2)Å, V=1037.1(3)ų, Z=4, R=0.0613. Crystallographic data for (GaMe₂)₂(2-SC₄H₃CH=NNC/sub 6/H/sub 5/)₂:monoclinic space group P2₁/n, a=15.996(2) Å, c=9.879(3)Å, β=100.07.(2)°, V=2764.599)ų, Z=4, R=0.0503.

• Proceedings of the Materials Research Society of Korea Conference
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• 1997.10a
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• pp.125-125
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• 1997

• Proceedings of the Materials Research Society of Korea Conference
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• 1997.10a
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• pp.126-126
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• 1997

• Journal of the Korea institute for structural maintenance and inspection
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• v.20 no.3
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• pp.75-82
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• 2016

This study analytically reviewed the behavior of steel plate concrete (SC) walls subjected to forced vibration to investigate the effects of shape and arrangement spacing of studs on the behavior spacing of studs in SC wall were carried out. From the analyses, it was noted that the damping ratio obtained from the time history analyses showed overall high value in Half-power Bandwidth method and the lowest value in Fitted Exponential Curve method. And, in half of the design strength, the damping ratio presented approximately 3.0~4.2% and, in the design strength, it was approximately 4.1~5.2%. When the developed studs were used, the damping ratio was reduced slightly and it did not show consistent results between DS1 and DS2. When the distance between the studs increases more than necessary, it was also confirmed that the natural frequency was reduced and the damping ratio was increased.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.48 no.1
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• pp.50-55
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• 2011

In this paper, Intermediate frequency tunable 4th order Switched Capacitor(SC) bandpass Sigma-Delta(${\Sigma}-{\Delta}$) modulator using feedback integrator using feedback integrator coefficients is proposed. The center frequency of the modulator can be easily changed than conventional structure because of a number of integrator coefficients which is decided rate of capacitors in circuit is reduced. In addition additive clocks and additive clock generating circuit are not necessary. The purposed modulator was implemented in $0.18{\mu}m$ CMOS technology. The resolution of the modulator within 200 kHz bandwidth and 80 MHz sampling frequency under fin = 15 MHz, 20 MHz, 25 MHz are over 12 bit.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.7
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• pp.401-403
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• 2014

In this paper, we address data detection technique using Fixed complexity LLL-based signal detection over multi-antenna SC-FDMA wireless channels. We use the property of effective channel matrix of SC-FDMA system. We can make the large effective channel matrix to various small effective channel matrix. We show that error performance of proposed detection technique.

• 건축구조
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• v.9 no.2
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• pp.54-57
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• 2002

• Microbiology and Biotechnology Letters
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• v.26 no.2
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• pp.117-121
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• 1998

Bacteriophage SC 921 of Lactobacillus plantarum, isolated from kimchi, showed high lytic effects at 0.2 M.O.I. level. The phage particle contained 4 major proteins (48, 34, 32, 29 kDa). Intact DNA of phage SC 921 is a double stranded linear molecule, and the genomic size is approximately 66.5 kilobase pairs (kbp). Restriction analysis of the genome showed that Sma I gave single site cut and Xba I gave 2 site cuts, while Cla I, Kpn I, and EcoR I formed 4, 5, and 6 cuts, respectively. Hind III digested phage DNA to many fragments. A restriction map of genomic DNA was constructed using the restriction endonuclease Kpn I, Sma I, and Xba I. Bacteriophage SC 921 was compared with B2 phage which had been reported to infect Lactobacillus plantarum ATCC 8014(KCCM l1322). Bacteriophage SC 921 differs from B2 phage at least in thr size of its genome and phage particle proteins.

• Journal of the Korea institute for structural maintenance and inspection
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• v.18 no.2
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• pp.74-81
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• 2014

In this study, it was conducted to improve the performance of stud of Steel Plate Concrete(SC) walls subjected to bending moment. Non-linearity of contact interface, connection, and material properties were considered in finite element modeling of SC wall. In order to validate the analytical model, furthermore, a foregoing laboratory experiment was simulated by FEM, so that comparison between the measured result and the analysis result have be done. The size of the analytical model was determined by reflecting various references and the analyses were performed according to various shapes and arrangements of stud. Additionally, the validity of the model considering the related provisions in the KEPIC SNG standard was also considered. As a result, the optimal shape and spacing of studs was proposed through this numerical analysis and standard verification.

• Proceedings of the KIEE Conference
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• 2004.05b
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• pp.186-191
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• 2004

전력계통에서 역률개선을 위해 사용하는 전력용 콘덴서(이하 SC bank)는 전력계통의 운전상 전압 제어와 역율개선이라는 두가지 측면에서 매우 중요한 전력설비이다. 또한 최근에 전력산업 구조조정에 의해 발전분야가 분할되는 시점에서 SC bank의 역할의 중요성이 강조되고 있다. 본 논문에서는 SC의 고장원인이 무엇인지를 현장조사를 통해 수행하였다. 그 결과 SC bank를 구성하고 있는 리액터, 콘덴서, PT, 혹은 CT 흑은 방전코일의 열화원인이 대부분 차단기의 투입서지와 차단서지에 의해 발생되고 있음을 확인하였다 또한 기존의 보호시스템은 SC Bank의 보호에 적합하지 않음을 검토하였다 차단기 서지에 대한 대책으로는 투입시 전압영점투입과 중성점 저항기의 취부로 투입서지 및 차단서지를 효과적으로 감소되는 현상을 모의와 현장실측을 통해 확인하였다. 또한 기존의 보호방식이 과전류와 과전압 부족전압 혹은 CT와 PT를 이용한 차동방식에 의해 셀의 경련변화를 감지하고 있으나 이 경우 보호맹점이 존재하게 됨을 검토하였다. 이러한 보호상의 문제점을 보완하는 방법으로 SC bank는 임피던스가 늘 일정하는 점에 착안하여 전압과 전류를 이용하여 임피던스의 변화량을 감시하고, 또 한가지 방법은 SC bank의 운전특성상 무효전력만을 발생시킨다는 점에 착안하여 만일 유효전력 성분이 SC bank에서 감지된다면 소자의 이상이나 비정상적은 전류경로가 된다는 결론에 도달하고 유효전력감시를 통한 SC bank의 열화감지가 가능하다는 결론에 도달하였다. 본 논문에서 제안한 3가지의 방법, 즉, 첫째 영점투입차단기 채택, 둘째, 중성점 저항기의 도입, 셋째 새로운 보호방식에 의한 기존의 보호맹점의 보완을 제안하였다. 위의 새로운 제안을 현장에 적용하는 경우 제작사의 제작불량을 제외한 운전상의 SC bank의 문제점 및 고장빈도는 현저히 감소하게 될 것으로 사료된다.