• 아동학회지
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• 제10권1호
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• pp.11-25
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• 1989

The purpose of the present research was to study developmental trends in and relationships between recall, organizational strategy, and metamemory in young children. The subjects were 84 children, 14 boys and 14 girls at each age level, 4, 6, and 8. Two tasks (memory task & metamemory task) were used to assess children's recall, organizational strategy, and metamemory based on Sodian et al.(1986). All subjects were randomly assigned either to the play-and-remember condition or to the sort-and-remember condition. The two tasks were administered to children individually with the memory task followed by the metamemory task. The data were analysed by the statistical methods of two-way ANOVA, Student-Newman-Keuls post hoc test, Mann-Whitney U test, Kruskal-Wallis test, Pearson's correlation coefficient and Kendall's Tau. Children's recall (free, conceptually-cued, and perceptually-cued) level increased with age. There were significant experimental condition differences in free recall and conceptually-cued recall, but not in perceptually-cued recall. Children's organizational strategy showed differential developmental trends by experimental condition. Use of conceptual strategy at both encoding and retrieval increased with age in both experimental conditions. Use of perceptual strategy (PS) at encoding showed an inverted-U age effect in the play-and-remember condition, but PS decreased linearly with age in the sort-and-remember condition. There were significant age differences in metamemory, and there were significant correlations between recall and organizational strategy.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.1219-1224
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• 2001

In this study, concrete what plenty of fly ash used as binder is left in three condition humid condition($35^{\circ}C$), normal condition($20^{\circ}C$) and cold condition($5^{\circ}C$). Fly ash concrete is tested in fresh properties and early strength. The result of tests could give the decisive factor of form side's stripping time. The purpose of this study is presenting the stripping time data to help the construction work. The result of this study is below. 1. The plain concrete specimen in humid condition developed high strength before 5 days, then strength development is declined. 10 day strength of plain specimen is smaller than the normal condition specimen's. 2. The strength of the concrete which plenty of fly ash used is more developed than the concrete in normal condition. It says that fly ash concrete is useful in the humid condition. 3. As fly ash substitution rate is downsizing and outdoor temperature degree is low, form stripping times is getting shorter.

• 대한수학회보
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• 제36권4호
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• pp.637-647
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• 1999

In this paper, we consider a free boundary problem with Pushchino dynamics satisfying the Dirichlet boundary condition. We shall the stationary solutions ($v^{*}(x),s^{*}$) exist and the Hopf bifurcation occurs at a critical point when s $\in$ (1/3,1).

• 동력기계공학회지
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• 제16권2호
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• pp.43-48
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• 2012

Generally accelerated life test is well known as one method to reduce reliability qualification test period. This test is conducted under the higher stress condition than normal condition. So it can save the test time by calculating the acceleration factor from the relationship between the worst stress condition and normal condition. This paper investigates the worst stress condition for the accelerated life test to increase the acceleration factor. Especially, we focused on the method to obtain effective acceleration factors under the worst stress condition. Moreover, we considered how to decide the worst stress condition by looking for the operating limit of this system. The acceleration factor can be estimated from the ratio of the kinematic viscosity in the normal condition and the worst stress condition, the lowest temperature, by using Arrhenius relationship. Through some experiments for a refrigerator's compressor, we were able to confirm how to increase acceleration factors and how to reduce the reliability qualification test period with minimum samples.

• Journal of Biosystems Engineering
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• 제29권5호
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• pp.419-424
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• 2004

In this study, a series of soil bin experiment was carried out to investigate experimentally the effect of the tire inflation pressure and axle load of tire on the steering torque for the off-road condition. The experiment was performed at the three levels of off-road conditions(ground I, ground II and ground III) and on-road condition(ground IV), four levels of tire inflation pressure(120 kPa, 170 kPa, 220 kPa and 270 kPa), and four levels of axle load(1470N, 1960N, 2450N and 2940N). The results of this study are summarized as follows: 1. Steering torque at the off-road conditions were higher than that on the on-road conditions for all levels of tire inflation pressure and axle load. 2. As the axle load increased, steering torque also increased f3r all experimental ground conditions. 3. For the axle load of 1470N the biggest steering torque was measured on the ground condition I, but as the axle load increased to the value of 2940N the biggest steering torque was measured on the ground condition III. From the above results, it was found that for the low axle load, steering torque gets higher on the soft ground condition, but for the high axle load, steering torque gets higher on hard ground condition for whole range of experimental conditions. 4. As the tire inflation pressure decreased, steering torque increased on the on-road condition, but no specific trend was not found at the off-road conditions.

• 한국수학교육학회지시리즈A:수학교육
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• 제48권3호
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• pp.287-302
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• 2009

This study investigated how 5th grade students found and understood triangle congruence conditions (SSS, SAS, ASA). In particular, this study focused on children's processes of discovering triangle congruence conditions and the obstacles which they encountered in the process of making sense of these conditions. Our data indicates that inquiring the cases in which less than three factors of triangle are given is helpful for children to guess triangle congruence conditions and understand the minimal characteristic of these conditions. And the degree of difficulty of discovering each congruence condition is different. Children discovered SAS condition and ASA condition easily, but it was hard for them to discover and understand that SSS was also a triangle congruence condition because they connected the length of a given side with the use of a scaled ruler not a compass.

• 지역사회간호학회지
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• 제15권2호
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• pp.266-276
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• 2004

Purpose: This study purposed to supply basic data for nursing intervention plan for middle-aged women healthcare and for finding solutions to nursing problems through understanding middle-aged women's depression, and to examine whether middle-aged women's depression is related with self-concept, self-efficacy, physical condition and social support. Method: The subjects were 200 middle-aged women aged between 35 and 60 and living in Daejon city and K city in Chungcheongnam-do, and the questionnaire survey was conducted from the 15th of August to the 18th of September in 2003 using a structured questionnaire. Collected data were analyzed through descriptive statistics, t-test, ANOVA. Pearson's correlation coefficient and stepwise multiple regression. Result: Middle- aged women's depression was found to be in a negative correlation at a statistically significant level with self-concept (r=-.679, p=0.000), self-efficacy(r=-.489, p= 0.000), physical condition(r=-.650, p=0.000) and social support(r=-.526, p=0.000). The most significant variables of middle-aged women's depression was self-concept(46.2%). Combining with physical condition(13.2%) and self-efficacy(0.9%), the three variables together explained 60.3% of middle-aged women's depression. Conclusion: The results show that middle-aged women's depression is closely related with self-concept, self-efficacy and physical condition. Thus this study suggests that the goal of nursing intervention for middle-aged women to overcome depression should be to help them to have positive self-concept, high self-efficacy and sound physical condition.

• 대한물리의학회지
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• 제10권2호
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• pp.81-87
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• 2015

PURPOSE: According to advanced research, the effect of foot type on balance is 3 type. There are squared foot, morton's foot and Egyptian foot. Above all, Morton's foot accounts for 22% of people. The purpose of this study is to find the effect of Morton's Foot on Balance Ability. METHODS: Twenty healthy woman participate in this study(Mean age:23.93; Mean height: 163.35; Mean weight: 56.20). They doesn't have musculoskeletal or neurogical disorder. Ten of participants have morton's foot group, and another ten person are normal foot group. Measurment of balance was used by Balance trainer(BT4) and balance pad(AIREX). Data analyzed in 3 way ANOVA. RESULTS: In foot type and support type of variables, Morton's foot was significant differences in C90 area and Velocity. There was no significant difference between foot type and visual condition. In support type and visual condition of variables, unstable support significantly decreased in Tracelength, C90area and Velocity. If we find out correlationship of foot type, visual condition and support condition, There didn't have relationship each other. CONCLUSION: This study found that correlationship of foot type, visual condition and support condition. But, there are no significant differences. Nevertheless, These results will also be able to offer baseline data about Morton's foot study in future.

• 한국주거학회논문집
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• 제6권1호
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• pp.31-37
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• 1995

The purpose of this study is to analyse the distribution of thermal sensation response and thermal environment condition in convective heating space. The contents of this study are as follows: 1)the spatial distributions of thermal conditions are measured 2)the thermal sensation vote of residents is taken in order to investigate the relation between thermal condition and human thermal sensation in sedentary condition 3)to analyse the distribution of subject's thermal sensation vote and thermal environment condition by two methods-regression method and graph method.

• Journal of applied mathematics & informatics
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• 제37권1_2호
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• pp.53-63
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• 2019

In this paper, we show the existence of solution of the neutral stochastic functional differential equations under non-Lipschitz condition, a weakened linear growth condition and a contractive condition. Furthermore, in order to obtain the existence of solution to the equation we used the Picard sequence.