• 한국위성정보통신학회논문지
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• 제3권2호
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• pp.38-42
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• 2008

2005년 DVB-S2 규격이 최종 마무리 되었지만 이미 보급된 기존의 수많은 DVB-S 수신기는 새로이 완전한 DVB-S2 수신기로 교체되기까지는 여전히 DVB-S 신호는 수신되어야 한다. 이를 위해서 방송사업자는 기존의 DVB-S 수신기에는 DVB-S 신호를, DVB-S2 수신기에는 DVB-S2 신호를 전송해야 한다. DVB-S2 수신기에서 DVB-S서비스를 수용하기 위해서는 DVB-S2 chip에 DVB-S 모듈이 구현되어야 한다. 이런 역호환성을 위해서 시스템에서는 계층적 변조 방식을 적용해야 하며, 시스템 마진을 만족하기 위해 본 논문에서는 편향각에 따른 시스템의 성능을 분석하였으며 또한 성능을 검증해 보았다. 그리고 본 방식을 검증하기 위해서 FPGA chip을 이용하여 테스트베드를 구현하였으며 이를 보인다.

• 수산해양교육연구
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• 제25권1호
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• pp.53-64
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• 2013

This study examined the relationships between the cognitions and strategies of child's problem behaviors depending on the level of preschool teacher's professional development. Participants were 176 preschool teachers in B Metropolitan city. The teachers completed rating scales to measure teacher's professional development, the perception of child's problem behaviors, and teacher's guiding strategies for child's problem behaviors. The collected data were analyzed using descriptive statistics, one-way ANOVA, and Pearson correlations. Results showed that there were different cognitions of child's problem behaviors depending on the level of teacher's professional development. Secondly, child's problem behavior guiding strategies by the level of teacher's professional development were significant differences in the positive prevention strategy I, II, and the positive reaction strategy. Finally, there were somewhat different relationship between the cognition of child's problem behaviors and the problem behavior guiding strategies according to the level of teacher's professional development. Findings are discussed in terms of the importance of teacher's professional development in the context of teacher's education planning for teacher's guiding strategy about preschooler's problem behavior.

• 한국생활과학회지
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• 제1권1호
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• pp.27-55
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• 1992

The Purpose of this study was to examine the predictive capacity of mother's perception of the family environment (cohesion, expressiveness, conflict, mother's psychosocial competence) for children's social competence. The hypotheses of this reserch were 1) There will be significant positive relationships among mother's cohesion, expressiveness, and mother's psychosocial competence. 2) There will be significant negative relationships between mother's conflict and measures of children's social competence. 3) There will not be a significant relationships between SES and measures of children's social competence. 4) There will be significant relationships between children's gender and measures of children's social competence. The subjects of this study were 133 family of mother-child. The period of research was from Aug. 20, 1990 to Feb. 29, 1992. Correlations, t-test, F-test, and multiple regression analyses were conducted to determine the relationships among variables and measures of total sample, daughter sample, and son sample. The results of this study appeared as follow: 1. Family environment (cohesion, expressiveness, and conflict) and mother's psychosocial competence were related to children's social competence. 2. There were negative relationship between mother's conflict and daughter's social competence. 3. Daughters had the higher social competence than sons. 4. Socioeconomic status(perceived by mother) of family was not related to children's social competence. 5. Sociodemographic variables affecting to children's competence were mother's school career, mother's age, mother's religion.

• 대한가정학회지
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• 제36권1호
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• pp.99-116
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• 1998

The purposes of this study were to find the influence of wife's home management behavior pattern and husband's perception about it on family life satisfaction, and to find out variables which influence them. For theses reviewing literature and empirical research were conducted. The major results were as follows; 1) The couple's psychological variables (ie, degree of life level recognition, of resourcefulness recognition and of communication) were relatively high. The wife's home management behavior pattern was relatively morphogenesis and the husband's perception about wive's it was relatively morphogenesis. And the couple's degree of family life satisfaction were relatively high. 2) Influential variables on wife's home management behavior pattern were level of education, degree of resourcefulness recognition and of communication. And influential variables on husband's perception about vive's it was degree of communication. 3) Influential variables on wive's the degree of family life satisfaction were degree of life level recognition, of resourcefulness recognition and of communication. And influential variables on husband's it were level of education, job, degree of life level recognition, of resourcefulness recognition and of communication. 4) The wife's home management behavior pattern and husband's perception about wive's it were to predict the couple's degree of family life satisfaction. 5) In cause-effect pathway mode. level of education·job·degree of life level recognition·of resourcefulness recognition and of communication showed direct and indirect effect on family life satisfaction through wife's home management behavior pattern or husband's perception about wive's it.

• 대한가정학회지
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• 제38권10호
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• pp.199-213
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• 2000

The purpose of this study was to investigate the effect of mother's depression, mother's negative self-acceptance, and father's psychological health perceived by mother, meditated by marital quality, on children's internalizing & externalizing behaviors. On the basis of precious literature, the theoretical model was specified and estimated. Subjects of this study consisted of 285 preschool children's mothers(160 boys and 125 girls aged from 5- to 7-year-old) drawn from fine child-care centers in Chung-ju City. The results were as following: Mother's depression was a statistically significant factor directly influencing on children's internalizing & externalizing behaviors and indirectly influencing on children's internalizing behavior through the marital quality. 2. Mother's negative self-acceptance was a statistically significant factor indirectly influencing on children's internalizing behavior through the marital quality. However, it did not haute any effects on either children's internalizing behavior or externalizing behaviors. 3. Father's psychological health perceived by mother was a statistically significant factor indirectly influencing on children's internalizing behaviors through the marital quality and directly influencing on children's externalizing behaviors. 4 Marital quality was strongly related to children's internalizing behaviors both directly and indirectly, however, it was not statistically associated with children's externalizing behaviors. Therefore, the model showed marital quality can be a mediating variable for children's internalizing behaviors only. The findings of results is to generate more broad-minded thinking about how mother's psychological factors, marital quality, and children's internalizing behaviors are interrelated.

• 대한전기학회논문지
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• 제41권6호
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• pp.652-660
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• 1992

0.10Pb(SbS11/2TSnS11/2T)OS13T-0.25PbTiOS13T-0.65PbZrOS13T ceramics modified by LaS12TOS13T(1[mol%]) and MnOS12T(0-0.30[mol%]) were fabricated. The structural and pyroelectric properties with contents of MnOS12T were studied. Crystal structure of a specimen was rhombohedral type and average grain sizes were decreased with increasing the contents of MnOS12T. Relative dielectric constant and dielectric loss factor were minimum in the specimens doped 0.24[mol%]MnOS12T. (PbS10.99TLaS10.01T)[(SbS11/2TSnS11/2T) TiS10.25TZrS10.65T]OS13T specimen modified 0.24[mol%]MnOS12T showed the good pyroelectric properties and pyroelectric coefficient and voltage responsivity were 6.73x10S0-8T[C/cmS02TK], 125[V/W], respectively. Voltage responsivity was increased with decreasing the chopper frequency.

• 한국보육지원학회지
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• 제18권6호
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• pp.37-57
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• 2022

Objective: The purpose of this study was to investigate whether parent's play participation and children's friendly play initiative affect children's executive function through children's play flow. Methods: The survey was conducted on 376 children between the age of 3 and 5 their parents in Daegu city and Gyeonsang province. Data were collected through the questionnaires and analyzed using descriptive statistics, independent sample t-test, one-way ANOVA, Pearson correlation analysis, and path analysis with SPSS 25.0 and AMOS 23.0 programs. Results: The major results were as follows. First, There were significant differences in parent's play participation, children's friendly play initiative, children's play flow, and executive function according to the children's age and family income. Second, parent's play participation and children's friendly play initiative indirectly affected children's executive function through children's play flow. Conclusion/Implications: This study highlights how children's play affects executive function. Also, the findings of this study will contribute to designing various programs that can promote parent's play participation, children's friendly play initiative, and play flow, which affects the children's executive function.

• 아동학회지
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• 제20권1호
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• pp.115-133
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• 1999

The present study focused on the potentially adverse consequences for children of martial conflict from the children's perspective. Children's perception of martial conflict was analyzed by relationship to behavior problems (assessed by the parents) and demographic variables (child's sex and age, parents' education, father's occupation, mother's employment, mother's age and family income). Children's perception of martial conflict varied by child's age and sex, parents' education, father's occupation, mother's age, and family income. On the other hand, behavior problems of children varied not by child's age and sex but by parents' education, father's occupation, family income, and mother's age. Behavior problems of children varied by child's perception of martial conflict and by frequency of martial conflict and self-blame. Correlations between children's perception of martial conflict and behavior problems varied by child's age and sex.

• 천문학논총
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• 제1권1호
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• pp.21-37
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• 1984

The origin of five small satellites (1980 S1, 1980 S3, 1980 S26, 1980 S27 and 1980 S28) and F-ring of Saturn which were recently discovered inside the orbit of Mimas, is proposed in terms of the resonant effects by external satellites in the Saturnian primordial extended ring. From the calculations of resonance locations and strengths, the following conclusion could be derived. Assuming that present two objects 1980 S1 and 1980 S3 were originally a single object 1980 S1+S3, 1980 S1+S3 had been formed due to Enceladus' 2/1 resonance and 1980 S26 due to Mimas' 3/2 resonance at first and then 1980 S28. 1980 S27 and F-ring were formed in the next due to 1980 S1+S3's 8/7, 9/8 and 10/9 resonances, respectively.

• 대한가정학회지
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• 제36권4호
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• pp.121-136
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• 1998

The purpose of this study was to investigate the causal resationships between children's learned helplessness, self-evaluation and the home environment which included the family's socio-economic status, parent's achieving pressure and maternal child rearing behavior. The results were as follows; The socio-economic status of home influenced on the parent's achieving pressure, maternal child rearing behavior and children's self-evaluation, but didn't influence children's learned helplessness. Parent's achieving pressure had a negative correlation with the maternal child rearing behavior and influenced children's learned helplessness, but did not influence children's self-evaluation. Maternal child rearing behavior influenced children's self-evaluation, but did not influence children's self-evaluation. Maternal child rearing behavior influenced children's self-evaluation, but did not influence children's learned helplessness directly. Children's self-evaluation had the strongest direct impact on children's learned helplessness. This was found to be a mediating factor between home environmental factor and children's learned helplessness.