• Journal of Biomedical Engineering Research
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• v.5 no.2
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• pp.111-120
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• 1984

A new restoration method of chest X-ray image (dual project filter) was proposed to improve SNR (signal to noise ratio) characteristics. In this method, a priori information of system and anatomical structure and statistics of projected object are used in the design of filter. Dual projection filter varies its parameters, adapting to the local regions of chest(lungregion, mediasternum, subdiaphragm) and the structure of chest (bone, tissue, blood vessel, bronchia). The performance of Dual Projection Filter was 0.1-0.2dB better than Dual Sensor Wiener Filter, which was used for initial estimate of Dual Porjection Filter.

• The Journal of Korean Physical Therapy
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• v.14 no.3
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• pp.418-432
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• 2002

본 연구의 목적은 다음과 같이 네 가지이다. 첫째, dual-strategy hypothesis 모델의 이론적인 배경을 서술한다. 둘째, 보행시작 시 (Gait Initiation)와 장애물 보행시작 (Stepping over obstacles)시의 motor task를 dual-strategy hypothesis 모델의 관정에서 서술한다. 셋째, 파킨슨씨 환자군과 뇌졸증 환자군을 이 모델의 관점에서 서술한다. 마지막으로, dual strategy hypothesis모델의 임상적용 가능성에 대해서 간단히 서술하는 것이다.

• Journal of electromagnetic engineering and science
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• v.1 no.1
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• pp.24-29
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• 2001

In this paper, the wideband microstrip antennas for the PCS & IMT-200O dual band are studied. Experimental and simulation results on the dual band antenna are presented. Simulation results are in good agreement with measurements. The experimental and simulation results confirm the wideband characteristics of the antenna. The studied antenna satisfies the wideband characteristics that are required characteristics for above 420 MHz impedance bandwidth for the PCS & IMT-2OO0 dual band antenna. In this paper, through the designing of a dual band antenna, we have presented the availability for PCS & IMT-20O0 base station antenna.

• Proceedings of the IEEK Conference
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• 2003.11c
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• pp.64-67
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• 2003

This paper presents the design of dual-band VCO using PBG structure for IEEE 802.11A/B. By adding switch circuit to the single-band VCO, we could achieve a dual-band VCO. The center frequencies of dual-band VCO are 5.93GHz(-13dBm) and 2.37GHz (3.50dBm). The phase noise is improved about l0dB by using PBG Structure.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.234-237
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• 2001

본 논문은 마이크로파 수신기시스템에서 발생되는 이미지성분을 효과적으로 제거하기 위해서 Dual Gate FETs을 이용한 이미지 제거 특성을 분석하였다. Dual Gate를 이용한 이미지 제거능력을 모의 실험한 결과 RF신호에 대한 이미지 제거특성은 -32dBc을 보였으며, Dual Gate FETs믹서의 변환이득은 1.7 dBm, 5GHz 발진주파수는 -117.3 dBc/100KHz 임을 확인하였다.

• Journal of Industrial Technology
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• v.27 no.B
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• pp.145-151
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• 2007

In this paper, a BPF with a dual mode folded ring resonator is presented. The dual mode ring resonator is also exactly analyzed by using Y-parameter method, in which the difference in admittance of two lines make the ring resonator work as a dual mode resonator. The proposed BPF has an advantage of small size compared to conventional one with dual mode ring resonator.

• The Pure and Applied Mathematics
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• v.20 no.2
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• pp.129-136
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• 2013

We research properties of ternary numbers with values in ${\Lambda}(2)$. Also, we represent dual ternary numbers in the sense of Clifford algebras of real six dimensional spaces. We give generation theorems in dual ternary number systems in view of Clifford analysis, and obtain Cauchy theorems with respect to dual ternary numbers.

• Journal of Applied and Pure Mathematics
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• v.4 no.3_4
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• pp.211-219
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• 2022

We study MDS(maximum distance separable) self-dual codes over Galois ring R = GR(2^m, r). We prove that there exists an MDS self-dual code over R of length n if (n - 1) divides (2^r - 1), and 2^m divides n. We also provide the current state of the problem for the existence of MDS self-dual codes over Galois rings.

• Korean Journal of Mathematics
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• v.24 no.4
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• pp.751-764
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• 2016

We investigate the self-dual codes over Galois rings and determine the mass formula for self-dual codes over Galois rings $GR(p^2,2)$.

• Korean Journal of Mathematics
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• v.21 no.2
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• pp.101-116
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• 2013

In this paper, we investigate the properties of fuzzy Galois (dual Galois, residuated, dual residuated) connections in a complete residuated lattice L.