• 대한수학회지
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• 제50권3호
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• pp.543-555
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• 2013

We consider powers of lexsegment ideals with a linear resolution (equivalently, with linear quotients) which are not completely lexsegment ideals. We give a complete description of their minimal graded free resolution.

• 대한수학회지
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• 제56권6호
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• pp.1613-1639
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• 2019

Imposing a strong condition on the linear order of shellable complexes, we introduce strong shellability. Basic properties, including the existence of dimension-decreasing strong shelling orders, are developed with respect to nonpure strongly shellable complexes. Meanwhile, pure strongly shellable complexes can be characterized by the corresponding codimension one graphs. In addition, we show that the facet ideals of pure strongly shellable complexes have linear quotients.

• Kyungpook Mathematical Journal
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• 제59권3호
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• pp.377-389
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• 2019

We evaluate the convolution sum $W_{a,b}(n):=\sum_{al+bm=n}{\sigma}(l){\sigma}(m)$ for (a, b) = (1, 28),(4, 7),(2, 7) for all positive integers n. We use a modular form approach. We also re-evaluate the known sums $W_{1,14}(n)$ and $W_{1,7}(n)$ with our method. We then use these evaluations to determine the number of representations of n by the octonary quadratic form $x^2_1+x^2_2+x^2_3+x^2_4+7(x^2_5+x^2_6+x^2_7+x^2_8)$. Finally we express the modular forms ${\Delta}_{4,7}(z)$, ${\Delta}_{4,14,1}(z)$ and ${\Delta}_{4,14,2}(z)$ (given in [10, 14]) as linear combinations of eta quotients.

• 한국산학기술학회논문지
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• 제9권5호
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• pp.1399-1406
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• 2008

이 연구는 바둑 학습 아동들의 뇌 기능과 기력 향상에 뉴로피드백 훈련이 미치는 영향을 알아보기 위하여 바둑학원 원생 30명(실험군 15명, 대조군 15명)을 대상으로 2007년 6월 15일부터 2007년 9월 15일 까지 실시하였다. 실험 결과는 뉴로피드백 훈련을 적용한 실험군이 주의 지수(좌)(p=.041), (우)(p=.007), 항스트레스 지수(좌)(p=.020), (우)(p=.019)에서 유의미한 차이를 보였다. 기력의 변화를 알아보기 위하여 기력 단계 별로 표준화되어 있는 기력 측정 문항지를 훈련 전과 훈련 후에 풀게 한 후 채점의 결과를 t-검증하였다. 뉴로피드백 훈련 전 조사에서 실험군과 대조군의 분석 결과 평균의 차이가 (p=.728)로 두 집단이 차이가 없는 것으로 나타났으나 뉴로피드백 훈련 후 조사에서는 실험군과 대조군의 평균의 차이가 (p=.021)로 유의미한 차이가 났다. 뉴로피드백 훈련 후 실험군이 대조군 보다 기력이 향상되었다고 해석 할 수 있겠다.

• Journal of Information Technology Applications and Management
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• 제14권4호
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• pp.43-59
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• 2007

The purpose of the study was to examine the effectiveness of Neuro Feedback training by observing the pre and post brainwave measurement results of about 50 (experimental group 25. comparative group 25) subjects who have shown psychological difficulties in studying. attention deficit, and personalities. The study took place at Neuro Feedback training Center B. in between the months of July 2006 and May 2007. The methodology involved in the study included the Coloring Analysis Program of the Brain Quotient Test. As the brain waves are adjusted by timeseries linear analysis. the brain function quotients can reflect the functional states of the brain. Through the test, three parameters relaxation, attention and concentration-were initially measured for one minute each and the lowest parameter out of the three was selected as the training mode or improvement target. The training took place two or three times a week. for about 40 to 60 minutes per session. Because the clients have come to the training center at different times. the researcher sampled the results of only those who had attended more than 30 training sessions. The tool used to measure the psychological reaction was POMS (Profile of Mood State). while the tool used to measure the emotional and attention-deficit characteristics was the Amen Clinic ADD Type questionnaire. Hypothesis testing included t-test. The result of the study showed the Theta: SMR ratio of (left)p = .013. (right) p = .019. The result also confirmed the differences of both ATQ(left) p = .011. (right)p = .030 and SQ(left) p = .017. (right) p = .022. The result confirmed of emotional p = .000. attention-deficit characteristics p = .000. The result of the study suggest Neuro Feedback technique's possibility in positively affecting the subjects' mental state and attention-deficit characteristics.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.299-307
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• 2005

The 180 km/h Korean Tilting Train(TTX) which is now developing as a part of the Korean National R&D project, was elaborately designed. As the tilting trains run curve track with the $30\%$ higher speed than normal trains, the higher centrifugal and dynamic force are expected. Furthermore the complex tilting system increase the probability of failure. Therefore it is very important for tilting train to ensure safety against derailment under the various kind of failed condition in the middle of running as well as normal operating condition. The TTX train have the relatively high roll stiffness to improve the lateral ride comfort and to limit the roll displacement on the curve. But the higher roll stiffness increase the risk of derailment on the twisted track. This paper describes the study to review the safety against derailment caused by the wheel unloading on the severely twisted track. The worst combination of maximum cant change with maximum twist defect was established by numerical simulation. And also it was assumed that the air bag deflated and still the train run its speed limit. Those kind of assumption might be the worst case from the view point of wheel unloading derailment on the twisted track. The dynamic simulation was done by means of VAMPIRE S/W and non-linear transient analysis. We found that derailment quotients Q/P was only slightly influenced by track twist but the wheel unloading was greatly influenced. And we ascertained that the higher roll stiffness the higher wheel unloading. In case of air bag deflated situation, the wheel unloading reached up to $100\%$ which means the wheel lift or jumped. Therefore it was concluded that the design need to be improved to ensure the safety against derailment on the maximum twisted track in case of air bag deflated and tilting train's speed limit.

• 한국산학기술학회논문지
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• 제11권9호
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• pp.3318-3324
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• 2010

본 연구는 2008년 3월부터 2009년 2월까지 S시 M동에 위치한 A청각장애인학교 학생 16명(초등학생 6명, 중학생 10명)을 대상으로 일상적 스트레스저항 능력에 뉴로피드백 훈련이 미치는 영향을 보고자하였다. 뇌파 측정 후 뉴로소프트에 포함되어 있는 그림 색칠하기로 휴식, 주의력, 집중력을 각기 1분씩 측정하여 자기조절능력을 분석하였다. 피검자가 피드백한 뇌파 중 상대적 비율이 가장 적은 주파수가 피검자의 훈련모드가 된다. 훈련장소는 A청 각장애인학교 훈련실, 1회 훈련시간은 40분이었으며 일 주일에 최소 2회로 방학을 제외한 8개월 정도 훈련을 실시하였다. 뉴로피드백 훈련 전과 훈련 후의 항스트레스지수, 긴장도(육체적 스트레스), 산만도(정신적 스트레스)의 비교는 뇌파측정을 통한 정량적인 뇌기능분석을 적용하였다. 첫째, 청각장애학생들의 스트레스저항 능력에 뉴로피드백 훈련이 긍정적인 영향을 미쳤으며, 항스트레스(좌 우)가 통계적으로 유의하였다. 둘째, 청각장애학생들의 육체적 정신적 긴장 저항 능력에 뉴로피드백 훈련이 긍정적인 영향을 미쳤으며, 긴장도(좌 우)와 산만도(좌 우)가 통계적으로 유의하였다. 이상의 연구 결과를 종합해 볼 때 청각장애학생들의 일상적 스트레스 저항 능력에 뉴로피드백 훈련이 효과적인 중재임이 검증되었다.