• 제어로봇시스템학회논문지
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• 제18권4호
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• pp.337-342
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• 2012

This paper presents performance evaluation of real-time mechanisms for real-time embedded linux. First, we presents process for implementing open-source real-time embedded linux namely RTAI and Xenomai. These are real-time extensions to linux kernel and we implemented real-time embedded linux over the latest linux kernel. Measurements of executions of real-time mechanisms for each distribution are performed to give a quantitative comparison. Performance evaluations are conducted in kernel space about repeatability of periodic task, response time of Semaphore, FIFO, Mailbox and Message queue in terms of inter-task communication for each distribution. These rules can be helpful for deciding which real-time linux extension should be used with respect to the requirements of the real-time applications.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.409-412
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• 2003

ACI design code is not capable of evaluating the inter-effects between concrete and torsional reinforcement on the torsional resistance of the reinforced concrete beams. In this study, the failure strengths of the ten reinforced concrete beams subjected to pure torsion were evaluated using 3-dimensional strut-tie models. The analysis results obtained from the present study were compared with those obtained from the ACI design code. The comparison showed that the accuracy and performance of the present method were better than the ACI design code. Thus, the method implementing a 3-dimensional strut-tie model can be possibly applied to the analysis and design of the reinforced concrete beams subjected to pure torsion as a rational design method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 D
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• pp.1327-1329
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• 1998

It is very important to select superior inter-layer PMD(Pre Metal Dielectric) materials which can act as penetration barrier to various impurities created by CMP processes. In this paper, hot carrier degradation and device characteristics were studied with material variation of PMD-1 layers, which were split by LP-TEOS, SR-Oxide, PE-Oxynitride, PE-Nitride, PE-TEOS films. It was observed that the oxynitride and nitride using plasma was greatly decreased in hot carrier effect in comparison with silicon oxide. Consequently, silicon oxide turned out to be a better PMD-1 material than PE-oxynitride and PE-nitride. Also, LP-TEOS film was the best PMD-1 material Among the silicon oxides.

• Structural Engineering and Mechanics
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• 제33권5호
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• pp.573-588
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• 2009

In this paper a four-node hybrid stress element is proposed for analysing arbitrarily shaped plates on a two parameter elastic foundation. The element is developed by combining a hybrid plate stress element and a soil element. The formulation is based on Hellinger-Reissner variational principle in which both inter element compatible boundary displacement and equilibrated stress fields for the plate as well as the foundation are chosen separately. This formulation also allows a low order polynomial interpolation functions. Numerical examples are presented to show that the validity and efficiency of the present element for the plate analysis resting on an elastic foundation. In these examples the effect of soil depth, interaction between closed plates on soil parameters, comparison with Winkler hypothesis is investigated.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2004년도 제5회 압연심포지엄 신 시장 개척을 위한 압연기술
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• pp.336-345
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• 2004

Investigated via a series of finite-element(FE) process simulation is the effect of diverse process variables on some selected non-dimensional parameters characterizing the thermo-mechanical behavior of the roll and strip in hot strip rolling. Then, on the basis of these parameters, on-line models are derived for the precise prediction of the temperature changes occurring in the bite zones as well as in the inter-stand zones in a finishing mill. The prediction accuracy of the proposed models is examined through comparison with predictions from a FE process model.

• International Journal of Industrial Entomology and Biomaterials
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• 제4권2호
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• pp.143-147
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• 2002

Studies on the interrelationship between biological yield and harvest index, and their association with shoot rearing were carried out in 9 promising mulberry genotypes, which indicated significant variations among genotypes. Biological yield had close association with leaf yield components indicating that they are inter-related for higher productivity in mulberry, Biological yield revealed highly significant positive correlation with important leaf yield components. However height of the longest branch showed negative correlation with biological yield. Genotypes with higher biological yield associated with low ratio of stem weight to leaf weight and high Harvest index on dry weight basis are to be selected for shoot rearing. Biological yield recorded on fresh weight basis had less impact on the present study in comparison to dry weight basis.

• 한국전자파학회논문지
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• 제11권3호
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• pp.464-473
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• 2000

The method is presented which predicts voltage waveforms at each nodes inter-connected arbitrarily on the coupled transmission lines by extracting the node connection condition to be included in the modal telegrapher's equation, hence analyzing the mechanism of waveform propagation on transmission lines. It is shown that it is also possible to analyze efficiently the coupled nonuniform lines. And then the nonuniformity of coupled lines is demonstrated for suppressing the crosstalk spikes using the one-dimensional inverse-scattering control theory. The predicted waveforms by presented method are analyzed and verified by comparison with those by the generalized S-parameter technique.

• Asian-Australasian Journal of Animal Sciences
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• 제22권7호
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• pp.955-961
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• 2009

The aim of this study was to determine the specific polymorphic sites in cattle breeds and inter- and interbreed genetic variation among breeds and to develop a databank of Turkish native cattle mtDNA using sequence analysis. The entire D-loop region was analyzed based on DNA sequences in Turkish Grey, East Anatolian Red, South Anatolian Red, and Anatolian Black native breeds. In total, 68 nucleotide differences were observed at 26 different sites. The variable positions consisted of 22 transitions, two transversions, and two insertions, but no deletions. Haplotype number, haplotype diversity, nucleotide diversity, and mean number of pairwise difference values were found to be 17, 0.993, 0.00478, and 4.275, respectively. In addition, a phylogeny was developed by comparison among cattle populations for which the entire D-loop sequence was available. A high level of genetic variation was observed within and among the native cattle breeds.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2011년도 학술발표회
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• pp.82-87
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• 2011

본 연구에서는 충북 괴산 달천의 수전교 지점에서 기포식, 압력식, 레이더, 부자식 등 4종의 수위계를 함께 운영하여 얻은 자료를 바탕으로 관측 기종과 조건에 따른 수위값의 특성을 상대 비교 분석하였다. 기준 수위는 동시간대 측정한 4개 수위계의 평균값을 이용하였다. 분석 결과 전체적으로 수위계가 약 ${\pm}2%$ 범위에서 상대차이가 발생하고 있으나 레이더 수위계는 저수위에서는 이보다 약간 큰 범위에서 변동하고 있고, 홍수시에도 일부 측정 결과들은 큰 변동성을 보이고 있음을 알 수 있었다. 이 결과는 각 수위계의 오차 특성을 정확하게 판단할 수는 없고 경향성만 보여주었으나 측정 환경과 기종에 따른 차이가 다소 있음을 보여주었다.

• 말소리와 음성과학
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• 제4권1호
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• pp.67-74
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• 2012

The neutralization of /$s^h$/ and /$s^*$/ in Gyeongsang dialects is a culturally salient stereotype that has received relatively little attention in the phonetic literature. The current study is a more extensive acoustic comparison of the sibilant fricative productions of Seoul and Gyeongsang dialect speakers. The data presented here suggest that, at least for young Seoul and Daegu speakers, there are few inter-dialectal differences in sibilant fricative production. These conclusions are supported by the output of mixed effects logistic regression models that used aspiration duration, spectral mean of the frication noise, and H1-H2 of the following vowel to predict fricative type in each dialect. The clearest dialect difference was that Daegu speakers' /$s^h$/ and /$s^*$/ productions had overall shorter aspiration durations than those of Seoul speakers, suggesting the opposite of the traditional "/$s^*$/ produced as [$s^h$]" stereotype of Gyeongsang dialects. Further work is needed to investigate whether /$s^h/-/s^*$/ neutralization in Daegu is perceptual rather than acoustic in nature.