• 한국의류학회지
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• 제28권3_4호
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• pp.521-526
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• 2004

The fragrant fabrics are prepared by the attaching microcapsules using acrylic binder. To improve the handle of fragrant fabrics, pretreatment by softener is suggested. The durability of fragrant fabrics and the change of their handle are investigated. It is carried out One-way ANOVA and Duncan test to determine bending properties, shear properties, surface properties of untreated, SO-MC and BI-MC by Kawabata system. BI-MC shows significant differences in B and 2HB. SO-MC shows significant differences in G and 2HG. It turned out the pretreatment by softener mitigated the effect of binder and makes fabrics softer than untreated fabrics.

• 한국전자파학회논문지
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• 제10권6호
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• pp.951-958
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• 1999

다반송파 변조방식,또는 직교 주파수 분할 다중업속 방식은 적응등화기를 사용하기 않으면서도 다중간섭제거 능력이 탁월하다고 알려졌다. 이 논문에서는 이러한 MC DS-CDMA/MPSK와 DS-CDMA/MPSK를 적용하여, 나카가미 감쇄 채널 환경에서 오율 특성을 분석하였다. 그 결과 동일한 대역폭에서는 반송주파가 증가함에 따라 처리이득이 커지므로 DS-CDMA/MPSK 신호보다 MC DS-CDMA/MPSK 신호가 오율 특성이 우수함을 알 수 있다.

• 디지털콘텐츠학회 논문지
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• 제5권3호
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• pp.187-191
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• 2004

모바일 통신 채널의 빠른 변화는 다중 반송파 변조의 성능에 많은 영향을 준다. 본 논문에서는 다중 반송파 CDMA 네트워크의 BER 성능을 분석하였고 등가 신호 대 전체 잡음 전력비를 라이시안 페이딩, 부분대역간섭 다중접속 사용자 간섭채널에서 유도하였다. MC-CDMA 시스템의 역방향 링크 등가 SNIR을 사용하여 MC-CDMA/BPSK 신호의 성능을 부분대역간섭의 점유율과 간섭 전력에 따라서 평가하였다. 그리고 다중반송파 멀티미디어 시스템의 QoS를 향상하기 위한 부분대역간섭의 영향을 종합적으로 연구하였다.

• Nuclear Engineering and Technology
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• 제21권3호
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• pp.216-222
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• 1989

원자력병원에 설치되어 있는 MC-50 싸이클로트론은 중성자 치료와 의학용 동위원소 생산을 위해 가동중에 있다. 본 논문에서는 MC-50의 설계 특징, 기계적 구조, 가동 특성에 대하여 기술하고 있다. 본 싸이클로트론의 최적 가동 조건은 반복적인 운전에 의해 결정되었으며, 내부 빔의 성능은 싸이클로트론 반경의 함수로서 내부 빔의 세기 및 공간 분포 측정을 통해 조사되어졌다. 일상적으로, 인출효율이 61%일 때 40$\mu$A세기의 50 MeV 양성자 빔을 얻었다.

• 한국기계연구소 소보
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• 통권20호
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• pp.57-63
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• 1990

The morphologies of MC carbides (M stands for metal) and creep-rupture properties in directionally solidified Rene 80 having standard and Hf-modified chemistries were studied. It was found that Hf depressed the melting point, $\gamma$- $\gamma$’ eutectic temperature and $\gamma$’ solvus of nickel-base superalloy Rene 80, but did not depress MC carbide forming temperature. The morphologies of MC carbides depended upon solidification sequence, which led to blocky type in the early stage and script type in the late stage of solidification. Creep failure occurs through the crack initiation at the transverse components of longitudinal grain boundaries or interdendritic carbides in directionally solidified superalloys. It could be concluded MC carbide morphologies played an important role in creep properties of DS superalloys, that is, Hf additions increased the creep ductilities and lives of Rene 80.

• 한국위성정보통신학회논문지
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• 제5권1호
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• pp.94-99
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• 2010

In this paper, we discuss a proposed two hop relay network with PB/MC-CDMA(partial block MC-CDMA) technique. The main advantages of PB/MC-CDMA system are the increased cell capacity and the high quality of performances. In the system, we employ relay scheme to focus on the coverage reduction and hotspot problem, hotspot is a location where a cluster of users are blocked or dropped for the reason of insufficient frequency resources. Frequency resource allocation scheme is put forward in a three cells system according to each problem. The simulation result shows the performance of the two hop transmission is better than the direct transmission and the proposed network can support much more users to relief hotspot effect compared to the conventional one.

• 자원리싸이클링
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• 제27권4호
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• pp.65-69
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• 2018

용매추출에서 등온추출곡선은 수상과 유기상에서 평형관계에 있는 농도를 나타낸다. 등온추출곡선과 조업선을 동시에 나타낸 McCabe-Thiele도는 물질 전달공정에서 여러 유용한 정보를 제공한다. 추출반응식과 평형상수를 알고 있는 경우 등온추출곡선을 계산으로 구하는 방법을 소개하였다. 또한 분배계수가 일정한 경우 금속 추출에 필요한 추출단수를 추산할 수 있는 Kresmer식을 소개하였다.

• International Journal of Internet, Broadcasting and Communication
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• 제11권2호
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• pp.76-83
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• 2019

In this paper, we propose the beamforming algorithm for the performance improvement of MIMO MC-CDMA system. The proposed multibeamforming of MIMO MC-CDMA structure having the same number of beamformer as the number of transmit antenna is derived by calculating the error signals between the coded pilot symbols and the corresponding received signals from the multiple transmitters of the desired user in the frequency domain, transforming the frequency-domain error signals into time-domain error signals, and updating the weights of the multibeamformer in the time-domain in the direction minimizing the mean squared error (MSE). The proposed approach can track each direction of arrival (DOA) of the signals from multi-antennas of a desired user. The performance improvement is investigated through computer simulation by applying the proposed approach to MIMO MC-CDMA system in a multipath fading channel with multiusers.

• Nuclear Engineering and Technology
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• 제54권3호
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• pp.811-816
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• 2022

This work presents the methodology used to expand the capabilities of the Monte Carlo code OpenMC for the calculation of reactor kinetic parameters: effective delayed neutron fraction β_eff and neutron generation time L. The modified code, OpenMC(Time-Dependent) or OpenMC(TD), was then used to calculate the effective delayed neutron fraction by using the prompt method, while the neutron generation time was estimated using the pulsed method, fitting Λ to the decay of the neutron population. OpenMC(TD) is intended to serve as an alternative for the estimation of kinetic parameters when licensed codes are not available. The results obtained are compared to experimental data and MCNP calculated values for 18 benchmark configurations.

• 미국학
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• 제32권1호
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• pp.169-198
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• 2009

Unlike the Democratic nomination, Republican nomination struggle has ended with an easy victory of Senator John McCain. This paper claims that the easy victory of McCain should not be interpreted as Republican's return to the median voter, because it masks religious schism and ideological discord among the Republicans. Christian rights were still reluctant to support McCain mostly due to his liberal position on social issues. In addition, the conservatives who request stricter immigration policy presented the mixed feeling toward the Republican candidate. Even though McCain chose the harmony inside the Republican party, rather than sticked to his liberal attitude toward social issues during the campaign for 2008 general election, McCain's defeat is unlikely to result in a rapid change in the Republican party.