• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2006.04a
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• pp.266-269
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• 2006

지하수, 해수 혹은 지표수의 희토류원소의 분포도에 있어서 Eu과 Ce은 산화수의 변화에 따라 다른 희토류원소로터 벗어나게 되고, 이로이해 Eu과 Ce의 이상이 발생된다. 지표수와 지하수의 연계성을 밝혀내기 위해 희토류원소를 이용하여 전주-완주지역에서의 지표수와 지하수시료를 2002년부터 2004년까지 6차례에 걸쳐 채취하였다. 이중 2003년 8월까지의 시료는 2개기관에서 각각 희토류원소 함량을 측정하였다. 또한 대수층 구성암석과의 상관성을 밝혀내기 위해 동일한 지역에서 코어시료를 채취하였다. PAAS(Post Archean Australian Shale)로 규격화한 희토류 원소분포도에 의하면, 갈수기인 2002년 4월과 2003년 11월의 지표수와 지하수는 대체적으로 중희토류가 부화되었고, 아울러 강한 Eu의 정(+)의 이상과 Ce의 부(-)의 이상을 보여주었다. 그러나 갈수기가 끝난 2003년 6월과 장마가 끝난 직후인 2003년 8월의 시료에서는 대부분의 지표수와 지하수 시료가 Eu의 강한 부(-)의 이상을 보여주었다. 그리고 일부 시료에서는 Ce의 부(-)의 이상도 관찰되었다. 이와 같은 Ce과 Eu의 변화는 산화-환원작용의 영향을 받은 산화수(즉 Ce3+와 Ce4+, Eu2+와 Eu3+)의 변화에 의한 것으로 해석할 수가 있다. 뿐만 아니라, 본 연구결과에 의하면, 전주-완주 지역에서의 지표수와 지하수는 매우 밀접한 연관성을 갖고 있으며, 그 순환속도 또한 비교적 빠른 편으로 나타났다. 그리고 본 연구결과, 희토류원소는 지표수와 지하수의 연계성을 밝혀내는 데 있으며 매우 유용한 지시자임을 확인하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.1
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• pp.37-49
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• 2019

Recently, most companies are using information technology and its importance is emphasized daily. In an environment where technology is changing rapidly, organizations focus on making good use of reasonable information technology. However, having excellent human resources and reducing turnover is a problem for most organizations. Accordingly, job satisfaction is a factor that can reduce negative factors and enhance positive factors. Therefore, this study explored the factors that can improve job satisfaction. In this regard, this study conducted an empirical analysis on employees who work in small and medium-sized Korean enterprises. We focused on mobile instruction and mobile information sharing as reasonable factors that improve employee job satisfaction. In addition, we examined the effects of employee self-efficacy to increase the influence of reasonable mobile task instruction and mobile information sharing on job satisfaction. Through the results, this research suggests ways to improve employee job satisfaction in the field of small and medium-sized Korean enterprises. It also provides practical implications and discusses future research directions.

• 대한공업교육학회지
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• v.38 no.1
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• pp.239-258
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• 2013

The purpose of this study is to define what circuit repairing ability is and to check improvement in learner's circuit repairing abilities by verifying conformity of learner's achievement of target goals that have been derived from headlight assignment based on circuit repairing ability that has been categorized into six sub-factors, which are preparing ability, attaching/detaching ability, circuit analyzing ability, inspecting and measuring ability, repairing (problem solving) ability and organizing ability. In order to achieve the purpose of study, degree of improvement in circuit repairing ability of learner's group was measured through experiment design and verification by group of experts. SPSS statistics program was used for statistical analysis in which average value for descriptive statistics, Cronbach ${\alpha}$ coefficient and t-test were conducted. Level of significance for t-test was p<.05. The conclusions from conducting this study are as follows. Firstly, the usage of terminology 'circuit repairing ability' pertaining to ability to repair failure of electrical devices in automobiles was confirmed to be appropriate. Secondly, the categorization of circuit repairing ability into sub-factors of preparing ability, attaching/detaching ability, circuit analyzing ability, inspecting and measuring ability, repairing (problem solving) ability and organizing ability was confirmed to be appropriate. Thirdly, field instruction on headlight assignment that has been revised according to achievement of learner's goals was confirmed to be effective in improving learner's circuit repairing abilities compared to regular training. Fourthly, field instruction on headlight assignment that has been revised according to achievement of learner's goals was confirmed to be effective in improving sub-factors of circuit repairing abilities, which are preparing ability, attaching/detaching ability, circuit analyzing ability, inspecting and measuring ability, repairing (problem solving) ability and organizing ability.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.753-757
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• 2003

In this paper, We propose an efficient iteration decoding control method with variable iteration decoding for iteration codes decoding. As the number of iterations increases, the bit error rate and frame error rate of the decoder decrease and the incremental improvement gradually diminishes. However, as the iteration decoding number is increase, it require much delay and amount of processing for decoding. Thus we propose variable iteration control method to adapt variation of channel using Frame Error-Check indicator. Therefore, the CRC method requires the fewest iterations and less computation than the CE method and the SCR methods.

• Economic and Environmental Geology
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• v.14 no.1
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• pp.1-25
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• 1981

This paper is a literature review on the following subjects: 1) relationships between porphyry molybdenum and copper systems; 2) hydrothermal environments of molybdenite depositions; 3) genetic significance of molybdenite polyforms; and 4) trace element patterns in molybdenite useful as an exploration guide. The geologic similarities between porphyry molybdenum (e. g. Climax) and porphyry copper (e. g. Bingham) systems exist, and similar techniques can be applied for exploring deposits of either type. Several features suggest that tungsten and tin may form porphyry-like systems (i. e. lowgrade, large tonnage). The clustering of porphyry-like systems in geophysically distinctive batholithic provinces is well documented and provides larger targets for reconnaissance exploration. Geochemical studies suggest that uranium should often occur in close proximity to molybdenum ores in igneous as well as sedimentary environments.

• Tunnel and Underground Space
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• v.19 no.4
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• pp.339-347
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• 2009

Despite the recent improvement in tunnel excavation technique, Tunnel collapse accidents still happen. This paper suggest two typical cases in unconsolidated ground condition. Collapse causes of each case were analyzed by the measurement records and numerical simulation, and then mechanism of tunnel collapse was investigated about each case. From this study, the crucial indicators of tunnel collapse were the variation of shear strain and ground water level, also, tunnel collapse deeply related to how shear deformation around tunnel was developed according to the excavation step.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.11a
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• pp.318-320
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• 2011

본 논문은 다중경로 페이딩 채널에서 폐루프 MIMO-OFDM 시스템을 구현할 때 효율적인 피드백 정보를 제공하기 위한 채널 품질 지시자(Channel Quality Indicator, CQI)를 결정하는 방법에 관한 것이다. 다중경로 페이딩에서 OFDM심볼의 부반송파들이 주파수영역에서 서로 다른 채널이득을 경험할 수 있고 여러 채널행렬 중에서 어느 채널행렬에 기반해서 채널 상태를 반영하는 채널대표값을 계산해야 하는지 분명하지 않다. 따라서 수신측에서 송신측으로 피드백하기 위해서 하나의 CQI정보를 생성하는데 필요한 채널 대표값이 필요하다. 채널 대표값을 구할 때 쉽게 생각 할 수 있는 방법인 기준신호의 평균 채널행렬을 이용하는 경우에는 채널상태를 정확히 반영하지 못하고 기준신호의 MMSE검출 후 SNR을 검출하는 방식은 채널상태를 정확히 반영해서 성능을 향상시키지만 많은 연산량을 필요로 한다. 이러한 문제를 해결하기 위해 허미시안 연산된 값을 채널 행렬 평균화해서 채널상태를 정확하게 반영하고 연산량을 줄이는 것에 중점을 두고 있다.

• The Journal of Natural Sciences
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• v.8 no.1
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• pp.93-100
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• 1995

This paper describes the design and implementation of ODA document formatter with the capability of interchange for the structured multimedia document information between heterogeneous systems. We designed the formatter generating the specific layout structure by the generic about structure and establishing relationship between specific logical/layout structure by interaction of user. For it, we proposed backtracking mechanism and processing rules of layout directive. Especially, we implemented and interactive method as user interface for ease creation of a document due to show user transparently complicated internal of structure.

• Journal of Korean Critical Care Nursing
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• v.4 no.2
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• pp.15-25
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• 2011

Purpose: The purpose of this study was to identify compliance of kidney transplantation(=KT) recipients and the factors influencing on compliance of KT recipients. Methods: One hundred patients who visited out-patients department after KT at S hospital transplant center in Seoul were enrolled in this study. Structured questionnaires of compliance, self-efficacy and family support were used to collect data. The data was collected from April 21 to May 21 in 2011. The data were analyzed by descriptive statistics, independent t-test, ANOVA and Pearson correlation coefficient. Statistical significance was accepted to the level of p<.05. Results: The mean score of compliance was 4.37(range from 1 to 5), and that of medication compliance was the highest and that of self care compliance was the lowest. There were no differences of compliance according to characteristics of the subjects. Compliance of the subjects had positive correlation with self-efficacy(r=0.23, p<0.05) and family support(r=0.33, p<0.05). Conclusion: Based on these results, it can be concluded that the nursing intervention program to improve self care using self-efficacy and family support need to be developed.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.223-226
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• 2015

최근 클라우드를 지원하는 Xen 가상화 환경에서 HPC를 구현하는 서비스의 수가 증가하고 있다. 따라서 SMP기반의 병렬컴퓨팅 구현을 위한 표준 라이브러리인 OpenMP 연산효율의 중요성이 높아지고 있다. 본 논문에서는 Xen 가상화 기반 OpenMP 환경에서 CPU Pinning 적용 여부에 따라 다양한 태스크 스케줄링의 성능 변화를 측정하기 위한 실험을 수행하였다. 실험결과, CPU Pinning을 적용했을 시정적 스케줄링은 3.7%, 동적 스케줄링은 3.4%, 태스크 지시자 스케줄링은 3.8%의 성능 향상을 보였다. 이러한 결과는 Xen 가상화 환경에서 효율적인 병렬 컴퓨팅 기법 설계를 위한 방향을 제시한다.