• Proceedings of the KSME Conference
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• 2005.11a
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• pp.45.2-45.2
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• 2005

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.253-255
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• 1999

주파수 선택적 페이딩을 통하여 무선통신에서 등화기로 결합된 다중 채널을 이용하여 성능을 평가하고 가우시간 잡음 상태와 독립적인 페이딩의 환경화에서 심볼간의 간섭과 데이터 이동 전송에서 발생되는 페이딩을 최소화하고 분산된 페이딩을 역변환하여 샘플링하고, 신호벡터의 특성을 이용하여 시뮬레이션을 통해 성능을 분석한다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.40 no.3
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• pp.173-179
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• 2016

This is a numerical study on the curved channel type of hydrogen reformer using the commercial code of fluid dynamics. We numerically compared the numerical model in a previous study model and the modelling of a tube type curved channel. In the result of numerical analysis on 4 types of curved channel reformers, the methanol conversion efficiency of type 1~4 were 45.0%, 45.3%, 45.6%, 45.6% respectively, and there was hardly any difference by ${\pm}0.6%$. In light of flow characteristics, the rectangle type tube and the type 2 with $45^{\circ}$ turn showed most uniform flow characteristics and concentration distribution of methanol, and the circular type tube and the type 3 with $90^{\circ}$ turn had most un-uniform flow characteristics and concentration distribution of methanol. We concluded that the design for curved channel reformer has to have rectangle type tube with curve of almost $45^{\circ}$ as in the type of curved pipe with $45^{\circ}$ turn.

• The Journal of the Korea Contents Association
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• v.16 no.12
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• pp.707-723
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• 2016

The purpose of this study is to focus on the effects of different channel types of Word-of-Mouth on the product attitude. Additionally, the product involvement and gender are considered as moderating variables. The results of this study show that different word-of-mouth channel types have different effects on the product attitude, that is, off-line has more influence than on-line does. Also the product involvement moderates the relationship between the channel types of word-of-mouth and the product attitude, while the gender does not. The results imply that while building the word-of-mouth marketing strategy, companies should not only pay attention to the on-line media channel, but lay importance on the off-line communication channel.

• Nuclear Engineering and Technology
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• v.12 no.3
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• pp.153-162
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• 1980

The investigation of the fuel cladding temperature behavior and heat transfer mechanism during the reflooding phase of a LOCA plays an important role in performance evaluation of ECCS and safety analysis of water reactors. Reflooding experiments were performed with horizontal and vertical flow channels to investigate the effect of coolant flow channel orientation on rewetting process. Emphasis was mainly placed on the CANDU reactor which has horizontal pressure tubes in core, and the results were compared with those of vertical channel. Also to investigate the rewetting process visually, the experiments by using a rod in annulus and a quartz tube heated outside were performed. It can be concluded that the rewetting velocity in horizontal flow channel is clearly affected by flow stratification, however, the average rewetting velocity is similar to those in vertical flow channel for same conditions.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1998.06a
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• pp.777-780
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• 1998

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1998.10a
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• pp.855-858
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• 1998

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.205-206
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• 2008

한의학에서 손목의 맥파를 손으로 짚어 보고 파형의 변화로써 병변의 원인을 파악하는 것은 기본적인 진단 방법이다. 진단을 위해 요골동맥의 촌, 관, 척 세 부위의 맥파를 수지를 통해 일정 가압을 하며 맥의 깊이, 강약, 빠르기 등을 촉진을 통해 맥상을 분석한다. 본 연구에서는 촌, 관, 척 부위를 동시 측정하기 위해 각 부위에 5개의 압력센서 어레이가 적용된 15채널 맥진기를 구성하였다. 또한 요골 동맥 부위에 적정 가압을 유지하기 위해 공기 커프를 이용한 공압 가압 방식을 적용하였다. 본 가압 방식을 통해 요골 동맥 부위에 연속적이며 정밀 가압제어가 가능하였다.

• Journal of the Korea Society of Computer and Information
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• v.16 no.2
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• pp.207-215
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• 2011

Due to the increasing availability and popularity of digital television (DTV), the numbers of TV channels and programs that can be selected by consumers are also increasing rapidly. Therefore, searching for interesting channels and program via remote controls or channel guide maps can be frustrating and slow. In this paper, in order to better satisfy consumers, we propose a dynamic channel surfing scheme that reduces the channel seek distance in DTV. The proposed scheme dynamically rearranges the channel sequences according to the channel currently being watched to reduce the channel seek distance. The results of a simulation experiment demonstrate that the proposed dynamic channel surfing scheme reduces the channel seek distance for DTV channel navigation when up-down channel selection interfaces are used.

• The Journal of the Acoustical Society of Korea
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• v.31 no.6
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• pp.367-372
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• 2012

This paper introduces noise masking algorithm for 64 channel digital hearing aid. 125 Hz spectral resolution is maintained for 64 channels from 125 Hz to 8000 Hz. The same spectral masking processing effects as the cochlea are considered and applied for the present hearing aid noise reduction processing algorithm. Theoretical algorithm has been ported into assembler language program software and been embedded into a DSP IC chip for the digital hearing aid. Some parts of noise masking software program code are explained, and the results of the real-time noise reduction are verified by electro-acoustic measurements.