• Korean Journal of Crystallography
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• v.3 no.1
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• pp.23-30
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• 1992

a-SiC crystals were grown on the (001) plane of a-SiC seed crystals by sublimation method to find effects of pressure-reduction rate of the crystal growth furnace own the growth rate and orientstion of grown SiC crystals. Pressure-reduction rate at the initial growth stage affected the crystallinity of grown SiC crystals. In case of high pressure-reduction rate, growth rate was high and 3csic polycrystalline was grown on the seed. On the other hand, low pressure-reduction rate caused the growth rate to be slow and 6H-SiC single crystal was grown on the seed. However, even after growing SiC for 2 hours under the condition in which.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.7A
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• pp.512-521
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• 2012

In this paper, we propose feasible combining rules for a decoding scheme of product codes to apply finite soft decision. Since the decoding scheme of product codes are based on complex tanh calculation with infinite soft decision, it requires high decoding complexity and is hard to practically implement. Thus, simple methods to construct look-up tables for finite soft decision are derived by analyzing the operations of the scheme. Moreover, we focus on using convolutional codes, which is popular for easy application of finite soft decision, as the horizontal codes of product codes so that the proposed decoding scheme can be properly implemented. Numerical results show that the performance of the product codes with convolutional codes using 4-bit soft decision approaches to that of same codes using infinite soft decision.

• Journal of Korea Water Resources Association
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• v.47 no.11
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• pp.1087-1094
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• 2014

Saltwater pumping method can be used to mitigate saltwater intrusion in coastal aquifers. However, the saltwater pumping well may discharge large freshwater along with saltwater, thereby wasting precious resources. A double negative barrier was proposed: an inland well to capture freshwater and a saltwater well near the coastline to pump saltwater. A previous study anaylzed effects of double negative barriers in dispersion-dominated coastal aquifers and determined the critical pumping rate at the saltwater well which minimized the saltwater ratio at the freshwater well. However, the study resulted in 1~15% of saltwater ratios, which were too high, for example, for drinking water standards. This study analyzed cases that were considered in the previous study, but for advection-dominated cases, and found that freshwater with sufficiently low saltwater ratios could be developed at the freshwater well. In addition, for optimal groundwater management of a watershed not only the minimum saltwater ratio at the freshwater well but also the least freshwater wasted at the saltwater well must be pursued.

• Asia Marketing Journal
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• v.8 no.1
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• pp.77-104
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• 2006

Cheong is a unique feeling of Koreans. Cheong is one of the most commonly felt psychological dimensions that Koreans encounter in their daily life. Cheong is bounded by ties of affection, regard, shared common experiences and feeling of connectiveness between persons. Thus Korean customers may be influenced by Cheong on behavior intention in the marketing context. This study examines the effect of Cheong on behavior intention in the service industry. The result shows that Cheong has a meaningful effect on behavior intention but not much on satisfaction. This implies that continuing relationship between customers and service providers is influenced by Cheong.

• Journal of Energy Engineering
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• v.12 no.3
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• pp.197-206
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• 2003

A numerical analysis of the pulse-jet cleaning characteristics in a porous ceramic candle filter system was performed. To obtain the detailed velocity and pressure distribution during the cleaning process in a porous filter system, the axi-symmetric compressible Navier-Stokes equations including energy conservation equation were solved by using the FLUENT code which adopts FVM (Finite Volume Method). The effects of pulse cleaning nozzle diameter, nozzle tip position, permeability of a porous ceramic candle filter, diffuser throat diameter, and cleaning pressure on the cleaning flow characteristics were investigated extensively.

• Journal of Korea Multimedia Society
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• v.7 no.1
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• pp.73-79
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• 2004

In this paper, we propose an efficient soft decision decoding algorithm for linear block codes. A conventional soft decision decoder have to invoke a hard decision decoder several times to estimate its soft decision values. However, in this method, we may not have candidate codewords, thus it is very difficult to produce soft decision values. We solve this problem by introducing an efficient algorithm to search candidate codewords. By using this, we can highly reduce the cases we cannot find candidate codewords. We estimate the performance of the proposed algorithm by using the computer simulations. The simulation is performed for binary (63, 36) BCH code in fading channel.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.669-672
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• 2008

In this paper, we propose a constant-amplitude multi-rode trans-bi-orthogonal modulation scheme by introducing a simple constant-amplitude coding scheme with redundant bits and trans-code, which if a modified orthogonal modulation scheme. Generally speaking, the orthogonal modulation scheme is not appropriate for the high speed data transmission applications because of bad bandwidth efficiency. Therefore, we use the multi-rode trans-bi-orthogonal modulation with trans-code for high bandwidth efficiency. Moreover, redundant bits are used for constant-amplitude-coding. Finally, we compare the performance of the proposed scheme with the orthogonal modulation and constant-amplitude multi-code trans-orthogonal modulation by using the computer simulation.

• Journal of the HCI Society of Korea
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• v.5 no.1
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• pp.19-24
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• 2010

The emotions evoked by single color or two-color combinations are investigated using bipolar affect adjectives. The color emotions using 10 bipolar affect adjectives are estimated for 5 single color patches and 10 two-color patch combinations. Twenty observers participated in the experiment and the same experiments are repeated using English and Korean words. The data analysis shows that there is little difference between English and Korean experiment. In many cases, color emotion for two.color combination can be predicted by averaging the color emotions of each patch. However, there are other cases that the emotion by one color dominates the emotion for the color pair.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.388-388
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• 2017

낙동강 하류 일대에는 수질과 수량 두 가지 요건을 모두 충족하는 강변여과수를 새로운 수자원 확보 대안으로 활용하고 있다. 일부 지역의 경우 과도한 취수량으로 인한 지하수 고갈을 우려하여 개발을 반대하거나 이로 인한 피해보상 범위가 명확치 않아 간접편입부지의 주민들이 피해를 우려하고 있는 실정이다. 따라서 해당 지역에서의 취수량은 인근 주민들에게 피해가 가지 않는 한도 내에서 이루어 져야한다. 하지만 타 지역으로 원수를 공급하게 되어 필요이상의 지하수를 개발하게 되거나 목표취수량에 부합하지 않아 추가 양수정을 시공하는 경우와 같이 수요량과 적정 취수량사이에 문제가 발생하는 경우가 있다. 이러한 배후 지하수위 감소영향과 추가취수량 확보를 위해 주입정을 활용한 인공함양 방법이 적용될 수 있다. 본 연구에서는 강변여과 취수 시 배후 지역의 지하수가 유입되어 인근 지역의 지하수위 강하량을 감소시키기 위한 최적 주입 위치 및 주입량을 산정하는 프로그램을 개발하였다. 고려된 최적화 결정변수는 주입정 개수와 위치, 그리고 주입량이며 제약 조건으로는 기 설치된 양수정 위치, 초기 자연 평형상태의 배후 지하수위에 근사하는 주입정 위치에 따른 최소 주입량 그리고 추가 생산 가능량 이다.

• Asia Marketing Journal
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• v.4 no.1
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• pp.77-100
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• 2002

본 연구는 대학 환경특성이 전반적 서비스품질, 서비스가치와 학생만족에 어떠한 영향을 미치는가에 대한 구조적 관계를 설정하고 이를 실증적으로 검증하였다. 저자들은 선행연구와 학생들과의 토의를 통하여 학생만족을 결정짓는 변수들을 24개로 선정하였다. 요인분석 결과, 교수/교육과정, 교육시설, 학내외 활동/위치, 교육지원서비스, 편의시설, 수업료의 6개 요인이 도출되었다. C 대학교의 463명의 학생으로부터 수집된 자료는 Lisrel 8.3을 이용하여 분석되었다. 실증분석 결과, 요약과 시사점은 다음과 같다. 첫째, 교육시설 요인이 전반적 서비스품질에 정(+)의 유의적 영향을 미치는 것으로 나타났다. 둘째, 학내외 활동/위치 요인이 전반적 서비스품질에 정(+)의 유의적 영향을 미치는 것으로 나타났다. 셋째, 교육지원서비스 요인이 전반적 서비스품질에 정(+)의 유의적 영향을 미치는 것으로 나타났다. 넷째, 교수/교육과정 요인이 전반적 서비스품질에 정(+)의 유의적 영향을 미치는 것으로 나타났다. 다섯째, 전반적 서비스품질이 지각된 서비스가치에 정(+)의 유의적 영향을 미치는 것으로 나타났다, 여섯째, 전반적 서비스품질이 학생만족에 정(+)의 유의적 영향을 미치는 것으로 나타났다. 일곱째, 지각된 서비스가치가 학생만족에 정(+)의 유의적 영향을 미치는 것으로 나타났다. 이러한 본 연구의 결과는 대학환경특성과 학생만족 간의 관계에 있어서 전반적 서비스품질과 서비스가치가 매개역할을 한다는 것을 의미하는 것이다. 연구의 마지막에서는 관리적 시사점과 미래의 연구방향이 제시되었다.