• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.6 no.4
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• pp.255-261
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• 2013

In this paper, we compare two methods that improve the reliability of soft output at the receiver of MIMO communications. The receiver complexity of spatially mutiplexed MIMO system is in proportion to the number of candidate vectors. Low complexity receiver techniques involving a small number of candidate vectors, provide soft output values of low reliability. In order to improve the low reliability of soft output, two previous methods can be used; the first method involves a clipping threshold, the second method uses Euclidian distance instead of squared Euclidian distance. In the paper, we address the theoretical similarity of the two methods, then we compare the two methods from the perspective of hardware implementation.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.543-547
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• 2007

화석연료의 점진적 고갈과 그 사용에 따른 지구온난화 그리고 에너지 안보를 해결하기 위하여 세계 각국에서는 대체에너지 개발에 노력을 기울이고 있다. 그 중 수소는 가장 주목받고 있는 대체에너지 원으로 현재 기술개발을 통하여 상업화 시기를 앞당기려고 하고 있다. 다시 말해서, 현재는 수소에너지 시대의 진입 시점이라고 할 수 있다. 이러한 수소는 다양한 소스에서 생산될 수 있으며, 수송연료로 연소 시, 유해 배출물이 거의 나오지 않는 장점이 있다. 그러나 수소는 그 생산 경로에 따라서, 다양한 환경성 및 경제성을 나타낼 수 있다. 본 연구에서는 국내 수소 생산 방식으로 개발/상업화 되어 있는 NGSR, Naphtha SR, WE에 대하여, LCA와 LCCA 방법을 통하여, 수소 경로 전반 즉, 원료채취에서부터 자동차로 주행하였을 때까지를 포함하여 각 대상 수소 경로의 환경성과 경제성을 평가하였다. LCA와 LCCA 결과를 살펴보면, Naphtha SR 및 NGSR 수소 경로에서는 지구온난화와 화석자원 소모 부문 모두 기존연료와 비교해보았을 때 개선효과가 뚜렷하게 나타났으나, WE 수소 경로에서는 오히려 환경부하가 증가되는 것으로 나타났다. 또한 비용적인 측면에서 살펴보면, 수소에 가솔린과 동일한 연료 세율을 부과하더라도 수소가 가솔린에 비하여 주행 시 연료 비용이 저감되어 연료로서 가격경쟁력을 확보하였으며, 연료세를 부과하지 않는 다면, Naphtha SR로 생산하여 유통한 수소가 수송연료로써 가장 비용 효율적인 것으로 나타났다.

• The Journal of the Korea Contents Association
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• v.18 no.2
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• pp.73-80
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• 2018

The purpose of this study was to investigate the effect of rural cultural tourism factors on brand image of agricultural products. First, hardware component has a positive(+) effect on agricultural product brand image in part. Second, software component has a positive(+) effect on agricultural product brand image in part. Third, human resource factors have a positive (+) effect on agricultural product brand image in part The results showed that rural culture tourism constituent factor is an important factor affecting the image of agricultural products. This means that rural tourism can be an important factor in local income generation such as sales of agricultural products and regional development. It is necessary to develop strategies for rural development and income increase such as enhancement of attractiveness of rural cultural tourism elements and differentiation. In other words, the development of various strategies for rural cultural tourism elements can contribute to the image and activation of agricultural products.

• The Journal of Korean Society for Radiation Therapy
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• v.20 no.1
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• pp.31-36
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• 2008

Purpose: X ray irradiates material for dose distribution confirmation through material color variation to evaluate about possibility. Materials and Methods: That is rare earth material to pure KCl and KCl impurity Eu adding 0.5mol% by Czochralski method each single crystal grow and observed color variation of KCl X ray irradiation use of linear accelerator. Results: High energy X ray irradiation KCl:Eu show the blue fluorescence with purple color that pure KCl single crystal can confirm by show was not observed, but was colored violet. Conclusion: Colors variation of KCl founds stable color center from radiation and this color variation will be used usefully to X ray measurement material and phantom.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.1 no.1
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• pp.53-59
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• 2008

In this paper, we compare two methods that improve the reliability of soft output at the receiver of MIMO communications. The receiver complexity of spatially mutiplexed MIMO system is in proportion to the number of candidate vectors. Low complexity receiver techniques involving a small number of candidate vectors, provide soft output values of low reliability. In order to improve the low reliability of soft output, two previous methods can be used; the first method involves a clipping threshold, the second method uses Euclidian distance instead of squared Euclidian distance. In the paper, we address the theoretical similarity of the two methods, then we compare the two methods from the perspective of hardware implementation.

• The Journal of the Korea Contents Association
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• v.9 no.7
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• pp.361-370
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• 2009

This research, targeting the visitors to Hahoe Village at Andong, which is a cultural tourist attraction with its traditional cultural heritage well preserved, aimed at offering applicable implications to the staff in charge of management of Hahoe Village at Andong by clarifying which cultural tour experience factor has an effect on touring satisfaction and visitors' behavioral intention as a follow-up attitude from touring satisfaction, i.e. effect relationship between the intention of re-visit and intention of recommendation in a structural viewpoint. To sum up this research result, first, there are two factors of cultural tour experience: education and escape. These were found to have a positive effect on touring satisfaction. Second, four factors of cultural touring experience was found to have a positive effect on visitors' behavioral intention. Third, touring satisfaction was found to have a positive effect on visitors' behavioral intention

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.141-144
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• 2012

본 연구는 일반학부모의 장애아에 대한 태도가 통합보육태도에 미치는 영향을 알아보는데 목적을 갖고, 2012년 3월 2일부터 10일까지 J지역 소재 통합보육시설에 다니고 있는 일반 자녀를 둔 학부모 150명을 대상으로 설문조사하였는데 그 결과를 요약하면 다음과 같다. 첫째, 장애아에 대한 태도가 통합보육 일반 태도에 미치는 영향을 검증한 결과 인지적, 감정적 요소가 일반 태도에 통계적으로 유의한 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 장애아에 대한 태도가 통합보육 유아활동 및 교사관심에 미치는 영향을 검증한 결과 인지적, 행동적 요소가 유아활동 및 교사관심에 통계적으로 유의한 정(+)의 영향을 미치는 것으로 나타났다. 셋째, 장애아에 대한 태도가 통합보육 행동문제에 미치는 영향을 검증한 결과 인지적, 감정적, 행동적 요소가 행동문제에 통계적으로 유의한 정(+)의 영향을 미치는 것으로 나타났다. 이상의 연구결과를 종합해 보면 일반학부모의 장애아에 대한 태도에 따라 통합보육 태도에 차이가 있음을 알 수 있다. 이는 일반학부모의 장애아에 대한 인지적, 감정적 요소에서 차이를 보여 이들 요인의 인식 개선시 통합보육태도를 높이는 긍정적인 요소로 작용할 수 있음을 시사한 것으로 볼 수 있다. 이 같은 결과는 통합보육이 장애유아와 일반유아 모두가 서로의 다양성을 인정하며, 이질적인 상대의 존재를 받아들이고, 존중하며 함께 배우려는 학부모의 인식전환이 선행되어져야 할 것을 시사한 것으로 해석할 수 있다.

• The Journal of the Korea Contents Association
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• v.16 no.9
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• pp.1-11
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• 2016

The purpose of this study is to examine the factors influencing relationship quality and L-Loyalty in Location-Based Service (LBS). This model tests various theoretical research hypotheses relating to LBS, relationship quality, and L-Loyalty. The target population of this study is LBS users. The results of hypothesis testing are as follows. First, personalization and perceived value positively influence commitment and perceived risk negatively influence commitment. Second, personalization, ubiquity, and perceived value positively influence satisfaction and perceived risk negatively influence satisfaction. Finally, commitment and satisfaction positively influence L-Loyalty. The results of the study will provide various implications to improve relationship quality and to secure high loyalty customers in LBS.

• Communications for Statistical Applications and Methods
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• v.16 no.3
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• pp.429-436
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• 2009

This paper considers the integrated process control procedure for detecting special causes in an IMA(1,1) process that is being adjusted automatically after each observation using a minimum mean squared error adjustment policy. When the control chart signals after the occurrence of a special cause, the special cause will be detected and eliminated from the process by the rectifying action. However, when the elimination of the special cause costs high or is not practically possible, an alternative action is to readjust the process with appropriately modified adjustment scheme. In this paper, we propose the readjustment procedure after having a true signal, and show that the use of the readjustment can reduce the deviation of a process from the target.

• Journal of the Korean Vacuum Society
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• v.11 no.4
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• pp.249-255
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• 2002

For a formation of membrane structures, single crystal silicon wafers have been anisotropically etched with solutions of KOH and KOH-IPA. The etching rate was observed to be strongly dependent upon the etchant temperature and concentration. Mask patterns for the etching experiment was aligned to incline $45^{\circ}$on the primary flat of the silicon wafer. The different etching characteristics were observed according to pattern directions and etchant concentration. When the KOH concentration was fixed to 20 wt%, the U-groove etching shape was observed for the etching temperature of above $80^{\circ}C$, and V-groove shapes observed at below $80^{\circ}C$. Hillocks, which were generated at the etched silicon surfaces, has been decreased as the increasing of the etchant temperature and concentration.