• Journal of Electrical Engineering and Technology
• /
• 제13권6호
• /
• pp.2354-2363
• /
• 2018

This paper proposed a novel double closed control strategy for single-phase voltage source pulse width modulation (PWM) rectifier based on active disturbance rejection control (ADRC) and dq current decoupling control. First, the mathematical model of the single-phase PWM rectifier in the d-q axis synchronous rotating reference frame is established by constructing a virtual component using a second-order generalized integrator (SOGI). Then, the mathematical model is simplified according to the active power conservation, and the first-order equation of single-phase PWM rectifier voltage outer loop is acquired. A linear auto-disturbance rejection controller is used to design the voltage outer loop according to the first-order equation. Finally, the proposed control strategy and the traditional PI control are compared and verified by simulation and physical experiments. Both simulation and experimental results confirm that the proposed control strategy has excellent dynamic performance and strong rejection ability to disturbances.

• 아동학회지
• /
• 제19권2호
• /
• pp.115-132
• /
• 1998

The present study investigated the construction of the moral concepts of 3-, 4-, and 5- year old Korean children. Instruments were the Maternal Behavior Research Instrument by Schaefer for mother and feather nurturing attitudes, and the Domain Distinctiveness Model for children's moral judgments. Maternal and teacher attitudes were categorized by the affection-rejection factor consisting of affection-affection, affection-rejection, rejection-affection, and rejection-rejection dimensions, and by the permissive, -control factor consisting of permissive-permissive, permissive-control, control-permissive, and control-control dimension. Children's data were collected with an individualized interview in which children were asked to judge moral and social conventional transgression events. 30 children were assigned to each of the maternal/teacher attitude dimensions; thus, there were 120 children for each factor. Results showed that (1) the affection-affection cohort was must strongly related to moral rules using both the seriousness criterion and deserved punishment criterion, and (2) the permissive-permissive cohort was most strongly related to reasoning and action. However, this cohort did not break out of children's structural limitation (limited responses to the intangible).

• 가정과삶의질연구
• /
• 제28권5호
• /
• pp.1-12
• /
• 2010

This study investigates the mediation effects of affection-rejection parenting in the relationships between reports by mothers in regards to marital conflicts and the behavior and emotional control of preschoolers. The participants were 311 preschoolers and their mothers. A total of 311 preschoolers attended kindergartens or day care centers in Daegu or Gyeongbuk Province. The collected data were analyzed by Pearson's correlation, single and hierarchical multiple regressions, using SPSS Win 15.0. The results are as follows. (1) Mothers' marital conflicts exerted indirect effects on preschoolers' behavioral control mediated by affection parenting. (2) Mothers' marital conflicts exerted indirect effects on preschoolers' behavioral control mediated by rejection parenting. (3) Mothers' marital conflicts partly exerted indirect effects on preschoolers' emotional control mediated by affection parenting. (4) Mothers' marital conflicts partly exerted indirect effects on preschoolers' emotional control mediated by rejection parenting.

• 아동학회지
• /
• 제21권1호
• /
• pp.307-322
• /
• 2000

This study examined the relation between parent attachment, peer rejection, and friendship in 768 eighth grade students and victimization by peers in early adolescence. The subjects reported on father attachment, mother attachment, and victimization. Victimization was also rated by peers and teachers. The subjects were assessed on peer rejection and friendship(number of friends and presence of a best friend). The results indicated that (1)Father attachment and mother attachment were negatively related to self-reported victimization; (2)Peer rejection was positively related to victimization; (3)The number of friends was negatively related to victimization rated by peers, and victimization rated by peers varied as a function of the presence of a best friend only for girls; (4)The relation between parent attachment and victimization was not mediated by peer rejection or friendship, which indicated that parent attachment had a direct influence on victimization.

• 대한가정학회지
• /
• 제46권9호
• /
• pp.61-69
• /
• 2008

The purpose of this study was to investigate similarities in behavioral characteristics between children and their friends. Aggression and withdrawal behaviors, in conjunction with the effects of friendship quality and characteristics on peer rejection were analyzed. The participants were 414 fifth and sixth grade primary school children recruited from public schools in Bucheon city. Firstly, the peer nomination index was used to assess aggression, withdrawal, and peer rejection. Secondly, children reported on the quality of their friendships using the Friendship Quality Scale. The results indicates similarities in aggression and withdrawal between children and friends. Friends' aggression and withdrawal characteristics predicted children's peer rejection, which was more pronounced with higher friendship quality.

• 한국조리학회지
• /
• 제13권2호
• /
• pp.153-162
• /
• 2007

The purpose of this study was to examine the mediating role of nausea, learned food aversion, and appetite on the relationship between food neophobia and food rejection. A total of 250(122 healthy males and 128 healthy females) questionnaires were completed. Path analytic model was used to measure the mediating effect. Results of the study demonstrated that the path analytic result for the data also indicated excellent model fit. Furthermore, the mediating analysis indicated that the influence of food neophobia was mediated by mediator. The effect of food neophobia on appetite was perfectly mediated by nausea and learned food aversion. In the contests of general food rejection, the effect of food neophobia on food rejection was perfectly mediated by appetite. It should be noted that the original model was modified and should, preferably, be validated in future research.

• Journal of electromagnetic engineering and science
• /
• 제11권4호
• /
• pp.257-261
• /
• 2011

A highly efficient 2.4 GHz rectenna is designed using a harmonic rejection bandpass filter. The rectenna is printed on Rogers Duroid 5880 substrate with ${\varepsilon}_r$=2.2 and a thickness of 1.6 mm. The rectenna consists of a microstrip antenna and high order harmonic rejection bandpass filter, microstrip lowpass filter, and Schottky barrier diode (HSMS2820). The use of a $2^{nd}$ and $3^{rd}$ harmonic rejection microstrip bandpass filter in the rectenna results in high conversion efficiency. The proposed rectenna achieves a RF to DC conversion efficiency of 72.17 % when the received RF power is 63.09 mW.

• Animal cells and systems
• /
• 제9권4호
• /
• pp.211-213
• /
• 2005

In bird species that suffer brood parasitism, the question about which sex is responsible for egg rejection has important implications for determining the coevolutionary relationship between brood parasites and their hosts. In order to determine which sex rejects a parasitic egg in vinous-throated parrotbills (Paradoxornis webbianus) which have egg color dimorphism, we conducted model egg experiments and video-recorded the behavior of the focal pair. Both sexes showed rejection behavior to the parasitic eggs. It indicates that the vinous-throated parrotbill may have a high rejection rate and faster spread of any rejection alleles through out populations. However, further studies are still needed to confirm the egg recognition mechanism in this species, which will expand our knowledge of the evolutionary relationship between host and parasite.

• 대한가정학회지
• /
• 제47권5호
• /
• pp.49-57
• /
• 2009

The purpose of this study was to investigate the correlation between self-report, peer nomination, and teacherreport of peer group rejection among preschool children. Moreover, we examined the influence of self-concept, language skills, social behaviors, and hyperactivity on peer group rejection. The participants were 297 4 and 5 year children recruited from preschools and day care centers. Teacher completed children’s social behaviors and children were interviewed to assess their self-concept and language skills. The results indicated that teacher-report was significantly correlated with self-report and peer nomination. According to informants, the associations between peer rejection and children's characteristics were different.

• 정보저장시스템학회논문집
• /
• 제3권4호
• /
• pp.167-172
• /
• 2007

The recently-developed off-line learning control approaches for the rejection of periodic disturbances utilize the specific property that the learning system tends to oscillate in steady state. Unfortunately, the prior works have not clarified how closely the learning system should approach the steady state to achieve the rejection of periodic disturbances to satisfactory level. In this paper, we address this issue extensively for the class of linear systems. We also attempt to remove the effect of other aperiodic disturbances on the rejection of the periodic disturbances effectively. In fact, the proposed learning control algorithm can provide very fast convergence performance in the presence of aperiodic disturbance. The effectiveness and practicality of our work is demonstrated through mathematical performance analysis as well as various simulation results.