• 한국통신학회논문지
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• 제15권5호
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• pp.364-373
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• 1990

디지틀 필터를 전용 하드웨어나 범용 계산기에 의해서 實現할 때 有限 語長 實現에 기인해서 量子化 誤差(演算, 誤差, 係數 量子化 誤差)가 필연적으로 발생하며, 또한 이러한 量子化 誤差의 最小化를 위한 等價 變換 行列이 연구되었다. 본 논문에서는 演算 誤差 最小 實現과 係數 量子化 誤差 最小 實現과의 상호 등가 변환할 수 있는 等價 變換行列을 유도하고 유도된 等價 變換 行列의 유효성을 나타내기 위해서 演算 誤差 最小型 2차 디지틀 필터로부터 係數 量子化 誤差 最小型 2차 디지틀 필터를 설계하고 시뮬레이션하였다.

• Computers and Concrete
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• 제15권3호
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• pp.461-471
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• 2015

The permeability is the most direct indicator to reflect the durability of concrete, and the testing methods based on external electric field can be used to evaluate concrete permeability rapidly. This study aims to use an experiment method to accurately predict the permeability of concrete box beam during service. The ion migration experiments and concrete surface resistivity are measured to evaluate permeability of five concrete box beams, and the relations between these results in service concrete and electric flux after 6 hours by ASTM C1202 in the laboratory are analyzed. The chloride diffusion coefficient of concrete, concrete surface resistivity and concrete 6 hours charge have good correlation relationship, which denote that the chloride diffusion coefficient and the surface resistivity of concrete are effective for evaluating the durability of concrete structures. The chloride diffusion coefficient of concrete is directly evaluated permeability of concrete box beam in service and may be used to predict the service life, which is fit to engineering applications and the concrete box beam is non-destructive. The concrete surface resistivity is easier available than the chloride diffusion coefficient, but it is directly not used to calculate the service life. Therefore the mathematical relation of the concrete surface resistivity and the concrete chloride diffusion coefficient need to be found, which the service life of reinforced concrete is obtained by the concrete surface resistivity.

• Journal of Preventive Medicine and Public Health
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• 제7권2호
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• pp.299-304
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• 1974

대구시내 중고등학교에 재학중인 12세에서 17세 사이의 남학생 360명을 대상으로 체격을 측정하여 체격의 대표치라고 할 수 있는 신장을 독립변수로 하고 년령 증가에 따라 변화가 뚜렷한 11가지의 체격치 (체중, 흉위, 좌고, 하지장, 대퇴장, 대퇴위, 하퇴장, 상지장, 상박장, 전박위 및 피부두겹두께)를 각각 종속변수로 하여 회귀분석을 하고 결정 계수를 산출 하였다. 회귀분석의 결과를 보면 회귀계수는 신장에 대한 체중의 회귀계수가 0.90으로 가장컸으며 피부 두겹 두께의 회귀계수가 0.09로서 가장 작았다. 대개 측정치가 크면 회귀계수도 컸으나 그 관계가 꼭 일정하지는 않았다. 직선이나 곡선의 회귀관계에서 두 변량의 관계 표현의 적합도를 나타내는 결정계수는 대퇴장과 피부 두겹 두께의 경우를 제외하면 거의 모두 1에 가까워서 이들은 직선의 회귀방정식으로서도 두 체격치사이의 관계를 무리없이 표현할수 있었으며 특히 피부두겹두께의 경우에는 측정과정에서 일어나는 오차가 전체에 미치는 영향이 상당히 커서 일차회귀로서는 표현이 아무래도 미흡함을 알수 있었다.

• 사회경제평론
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• 제38호
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• pp.9-49
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• 2012

순운은 개인이 선택하거나 통제할 수 없는 - 선택하거나 통제할 수 없기 때문에 개인에게 책임이 따르지 않는 - 운을 의미한다. 순운의 행불운은 개인에 따라 갈린다. 개인 간 행불운의 차이 때문에 불평등이 발생한다. 운-평등주의적 정의는 순운에 의한 개인 간 행불운의 차이를 재분배를 통해서 제때에 완전하게 제거할 것을 요구한다. 그러나 개인 간 행불운의 차이가 제때에 완전하게 제거되지 않는다면, 더 나아가 개인별행불운이 쌓인다면, 불평등이 어떻게 변할까? 논문은 순운의 행불운을 하늘에서 떨어지는 만나(manna)로서 모형화한다. 만나는 재분배되고 축적된다. 다양한 leximin 재분배 수준과 만나 축적률의 조합에서 만나 축적량 분포의 Gini 계수를 구하는 모의실험을 하였다. Leximin 재분배 수준에 따라 만나 축적률이 높을수록 Gini 계수가 낮은 부(-)의 관계 혹은 만나 축적률이 높을수록 Gini 계수가 높은 정(+)의 관계가 결정된다. Leximin 재분배의 도입이 빠를수록 부(-)의 관계를 갖는 최소 leximin 재분배 수준이 낮다. 낮은 수준의 재분배 정책을 이른 시기에 도입하는 것이 높은 수준의 정책을 늦은 시기에 도입하는 것보다 효과적이다. '선성장 후분배'류의 정책이 개인에게 책임을 물을 수 없는 순불운의 희생자들을 더욱 불리하게 만들 수 있다는 정책적 함의가 있다.

• 전기학회논문지
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• 제58권4호
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• pp.832-839
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• 2009

In this paper, we introduce an design of fuzzy relation-based fuzzy neural networks with multi-output. Fuzzy relation-based fuzzy neural networks comprise the network structure generated by dividing the entire input space. The premise part of the fuzzy rules of the network reflects the relation of the division space for the entire input space and the consequent part of the fuzzy rules expresses three types of polynomial functions such as constant, linear, and modified quadratic. For the multi-output structure the neurons in the output layer were connected with connection weights. The learning of fuzzy neural networks is realized by adjusting connections of the neurons both in the consequent part of the fuzzy rules and in the output layer, and it follows a back-propagation algorithm. In addition, in order to optimize the network, the parameters of the network such as apexes of membership functions, learning rate and momentum coefficient are automatically optimized by using real-coded genetic algorithm. Two examples are included to evaluate the performance of the proposed network.

• 한국항공운항학회지
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• 제28권4호
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• pp.63-68
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• 2020

In this study, The purpose is to understand the influence of lovemark on relation continuing intention. As a result of reliability analysis, the Cronbach's α coefficient of all variables such as lovemark, relation continuing intention showed 0.8 or more, thus ensuring reliability. The results of regression analysis between variables for hypothesis testing are as follows. as a result of analysis on the effect of lovemark on the relation continuing intention, it showed that both factors of love and respect dimension had significant influences, and that the relationship intension also increased as the love and respect dimension increased. As a result of this study, In order to increase lovemark and relationship intension, it was also confirmed that efforts should be focused on immersion between airlines and customers. It was confirmed that efforts to increase the airline's lovemark are needed to retain existing customers and attract new customers.

• 산업기술연구
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• 제28권B호
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• pp.71-79
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• 2008

Reports about coefficients of consolidation in horizontal direction of marine clays located at seven different sites on western and southern coast area in Korea were reviewed and characteristics of them were investigated. As results of analyses, for relation between the depth of ground and coefficients, any trend and correlation between them can not be found since they are more influenced by the nature of geological formation rather than the depth of ground. Dissipation time t50, one of important factors in estimating value of coefficient of consolidation in horizontal direction, was found to be quite related to them. For the correlation between the maximum pore pressure developed and coefficients, coefficient of consolidation in the horizontal direction tend to decrease with increase of the maximum pore pressure whereas the ground water level or static pore pressure do not have any specific correlation with those coefficients. Values of coefficient tends to increase with values of liquid limit, plastic limit and plastic index and thus they are found to be directly influenced by the contents of fines. Values of coefficient of consolidation in horizontal direction are also increased with increases of permeability in horizontal direction and coefficient of consolidation in vertical direction. They were highly correlated between coefficient of consolidation and permeability in horizontal direction while values of coefficient of consolidation in horizontal direction have a relatively low correlation with values of coefficient of consolidation in horizontal direction. Sometimes, coefficient of consolidation in horizontal direction obtained from field tests were estimated 2-3 times greater than those from laboratory tests.

• 대한치과기공학회지
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• 제19권1호
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• pp.91-111
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• 1997

An aim of this study is to find out influenced factors of satisfaction degree on the clinical practice for the dental technology student and it can be provided the basic necessary data for the educational planning of the curriculum for the clinical practice. The target of study are selected form 7 junior health college students and colleges are located in around seoul form 14 junior health college throughout the nation. The questionnaries were distributed between 24th Feb to 30th July in 1997 to the 100 dental technicians who finished clinical practice and entered profession in 1997. All collected data were analysed by using SPSS/PC, Technical Statistic, One-Way ANOVA, Ttest, Person Correnlation Coefficient, Chrobach Alpha Coefficient and the result of the study is follow. 1) The satisfaction degree were classificated as 7 aspect and overall average score was 3.042. During that period satisfaction of personal relation aspect(M=3.737) shows highest level. Satsfiaction of clinical parctice(M=3.571) shows as second, Satisfiaction of environment(M=3.028), Satisfaction of guidance(M=2.915), satisfaction of subject are ordered of their scores. According to above study satisfaction's degree of subject show lowest level. 2) According to the result of verification of study. general character of student and satisfiaction degree has not much relation with sex, location of college, religion, period for enrolling college, teaching method of clinical practice. But the result show similar relation with following items. Satisfaction if subject and satisfaction of clinical practice(P=0.000), place of clinical practice and satisfaction of clinical practice(P=0.002), Academic record of college and satisfaction of clinical practice(P=0.000). 3) The relation of satisfaction(Subject, method of teaching, environment, period, rating, personal relation) of clinical practice and age of investigation's target Older student show higher satisfaction(P=0.040). Also method of teaching, environments, period, rating, personal relation has similarities with satisfaction. Therefore student who has higher satisfaction of clinical practice they also have higher rate for subject, environment, period, personal relation. 4) The result fo investigation, most interesting subject was crown & bridge and most difficult factor was too many simple-works to the student. One of ideal factor was discussing with counselor before they choose place for clinical practice. Third grade and first semester is most efficient time for clinical practice and 8 week is proper period for clinical practice. Clinical practice is absilutory mecessary and we find out most student rated positively. However we need more specific study about satisfcation of each subject. Because it shows lowest level and we need more pay attention for planning of clinical practice.

• 전자공학회논문지A
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• 제32A권6호
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• pp.1-9
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• 1995

The structures of inductive irises are used commonly in waveguide filter, especially at highter frequencyies, due to low loss and high temperature stability. However, the iris thickness can not be neglected, as it could be at the lower frequencies. Approximate models assuming zero thickness fail to predict the exact behavior of the filter. And current thickness correction is introduced which is valid in the case of thick irises only. Account of the effect of round is normally not taken. So the necessity of finding a relation for the two factors-iris thickness and round-arises in the design of waveguide filters. This paper describes a mutual relation that considers the combined effect of finite thickness and round from the start. In order to test the validity of the changed relation, weveral examples are given. And the measured response of each case is then compared with the predicted reponse. And it is shown that the radius is of perceptible influence on the transmission coefficient through a thick iris.

• 대한수학회보
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• 제40권2호
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• pp.309-317
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• 2003

In this paper we study the relation of Euler characteristic with respect to cohomology with compact support in F$_{p}$-coefficient for the fibration of ENR's and generalize some properties on proper G-spaces for locally compact Lie group G.G.