• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.12
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• pp.1112-1115
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• 2016

Global Positioning System(GPS) is a useful system used in both civilian and military applications. However, the signal of GPS is susceptible to jamming attacks due to low receive sensitivity, since the signals come from the satellite located at over 20,000 km above the earth. In this paper, we have conducted a preceding research on a non-Foster matching circuit that efficiently matches an electrically ultra-small GPS antenna. Electrically Small Antennas(ESAs) are inefficient radiators and are difficult to match in wideband due to extremely high quality factor. In order to match small GPS antenna in wideband, a non-Foster matching circuit for a small GPS antenna was designed. A negative impedance converter circuit consisting of Linvill's cross-coupled pair transistors was fabricated and its stability was verified by the time-domain stability analysis. In addition, anechoic chamber measurements show that the non-Foster matching circuit for small GPS antenna can lead bore-sight gain improvement by more than 17 dB.

• Korean Journal of Family Social Work
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• no.43
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• pp.5-35
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• 2014

The purpose of this study was to understand the practice experience of social workers in foster care center. This study applied a qualitative study and selected 7 social workers(4 middle-level managers and 3 in-line workers) who have worked for central and regional fostercare centers. We carried out individual interviews with them and conducted thematic analysisbased on data gathered from the individual interviews. We were able to grasp significantissues in foster care practices from analyses. The results of data analysis consisted of 4 themesand 15 sub-themes. The significant themes were 'policy objectives distanced from reality, unknown institution', 'loose network, missed service system', 'too much work, too many cases', 'excluded biological parents' roles, limited foster parents' roles'. Finally, the implications of thisstudy findings for child welfare policy and practice guidelines were discussed to improvefoster care centers.

• Korean Journal of Social Welfare
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• v.59 no.1
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• pp.301-327
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• 2007

The purpose of this study is to examine the timing and the risk factors associated with the adoption of legally-free foster children. The sample of the study was drawn from foster care files of Adoption and Foster Care Analysis and Reporting System(AFCARS) in 32 states between October 1998 (FY 1999) and September 2002(FY 2002). The timing post-TPR to adoption was examined by plotting the Kaplan-Meier cumulative hazard function for adoption and by plotting the KM hazard functions stratified by child's race and child's age at TPR. Cox proportional-hazards regression analysis was used to identify risk factors for adoption of legally-free foster children after TPR. The hazard of adoption was very low immediately after TPR but increased steadily starting at 3 months and then declined after 20 months. The cumulative hazard functions for White non-Hispanic children and Black non-Hispanic children crossed over at 13 months after TPR. Racial minority status, older age, and disability were negatively associated with the hazard of adoption. Physical abuse, sexual abuse had the lower hazard for adoption compared by neglect. Caretaker's inability to cope had the slightly lower hazard for adoption whereas inadequate housing showed the slightly greater hazard for adoption. Characteristics of foster care services turned into be powerful predictors of adoption. Specifically, legally-free children placed in pre-adoptive homes, those who shared the same racial/ethnic background with their foster caretakers, and those who were placed in two-parent families have a greater likelihood of adoption. The findings highlight the importance of foster care service provisions after TPR to facilitate adoption of legally-free foster children. Furthermore, a more substantial resources and targeted support for foster children who experience physical abuse and sexual abuse in need of adoption should be provided for moving the foster children into permanency.

• Korean Journal of Social Welfare
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• v.59 no.1
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• pp.87-116
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• 2007

The purpose of this study is to identify the adaptation experience of foster children. This qualitative research was conducted through in-depth interview of 8 foster children in and over 4th grade. In data analysis of this qualitative study, the grounded theory suggested by Strauss and Corbin(1998) was used. The raw data collected from in-depth interview with the participants were analyzed in open coding, through theoretically sensitive and constant comparisons method. As a result, total 11 categories, 30 subcategories and 96 concepts were generated. In summary, the casual condition that caused the core phenomenon was 'family stability collapse'. The core phenomenon that foster children experience during the process of adaptation was 'marginalization'. The contextual condition that affected the outcome was 'cultural shock' and 'loyalty conflict.' The intervening condition that promote or restrain the action/interaction on core phenomenon were, 'support system', 'resilience menifestation', 'negative predestination'. The action/interaction strategy on core phenomenon were 'will to power' and 'pursuing moral superiority'. As a result, two concepts, 'mechanical adaptation to foster care environment' and 'active formation' of foster care environment' were assumed.

• Korean Journal of Culture and Social Issue
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• v.19 no.3
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• pp.507-528
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• 2013

The study examined the mental representation of children in foster care through the MacArthur Story Stem Battery (MSSB) and reviewed difference between children in foster care and typical children in terms of mental representation. Subjects of the study included a total of 50 children: 25 children (11 boys and 14 girls), aged from 5 to 8, in foster care in Gyeonggi Province, and 25 typical children (11 boys and 14 girls), aged from 5 to 8, who lived in Seoul and Gyeonggi Province. The research findings are summarized as follows: First, in terms of mental representation, children in foster care showed less subjects of empathic relations and more subjects of disorganized aggression than typical children. Second, children in foster care showed lower coherence mental representation than typical children. Finally, children in foster care were more likely to fail in emotional regulation than typical children in mental representation.

• Korean Journal of Social Welfare
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• v.58 no.1
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• pp.425-456
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• 2006

This study investigated the adaptation process of abused children in long-term foster care and the stages of adaptation process. Also, this study aimed to find the factors influencing the adaptation of abused children in long-term foster care and to examine the relationships between the adaptation process in long-term foster care and the recovery of aftereffect of the abused children. The researchers tried to find the factors influencing the possibilities about the return of their biological parents' home. The researchers used a purposeful sampling and interviewed three abused children and three parents in long-term foster care and two social workers. This study utilized grounded theory approach of Strauss and Corbin(1990) to analyze the interviewed data. Specifically, the researchers applied open coding, axial coding and selective coding from grounded theory approach to analyze the data. On the other hand, the researchers used Miles and Huberman(1994)'s time-ordered matrix and time-ordered network to investigate the categories influencing the adaptation process of abused children in long-term foster care. This study used interviewees, literatures, newspapers, and internet resources relating to abused children for triangulation of data. The researcher interviewed from October 15, 2004 to January 31, 2005. The total sessions of each person were consisted of two sessions for each person and the interview time of each session was one or two hours.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.12
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• pp.242-247
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• 2017

The foster care system is a social welfare service that supplements the functions of the family while enabling children, who cannot receive proper care from their biological parents, to receive the necessary protection under the plan within the prescribed period of time within a substitute or foster family. A large part of the emotional instability experienced by foster care children is interpersonal maladjustment. Low self-esteem leads to difficulty in forming social relationships due to negative interpersonal relationships. Thus, the purpose of this study is to investigate the effects of traditional dance programs on the foster children who live in Daejeon Metropolitan City. A comparison between the pre- and post-interpersonal scores showed that the scores were improved after the traditional dance program, and the children's intimacy formation and communication were also improved. The participants were less active at the beginning of the program, but became more interested and more active toward the middle of the program. The majority of the participants increased their degree of communication with the formation of intimacy toward the middle of the program, and their self-confidence improved in terms of their peer relationships. The purpose of this study was to investigate the effects of traditional dancing on the development of interpersonal relationships. In a subsequent study, a traditional dancing program consisting of various contents will be applied over a long period of time, which should provide them with the opportunity to improve their interpersonal skills. In addition, it is necessary to provide educational opportunities for helping foster children reduce their emotional instability with systemic and diverse traditional dance programs.

• Journal of electromagnetic engineering and science
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• v.17 no.2
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• pp.108-110
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• 2017

The global positioning system (GPS) is a useful system in civilian and military applications. However, because of the weak signal, GPS receivers are vulnerable to interference caused by unwanted signals or intentional jammers. To alleviate this issue, a controlled reception pattern antenna (CRPA) array can be employed to adaptively place radiation pattern nulls toward the direction of the signal interference. The performance of the CRPA array improves as the number of antenna elements increases. Therefore, antenna miniaturization is highly desirable for CRPA applications. We designed a compact CRPA array based on seven electrically miniaturized microstrip patch antennas (MPAs) on a 5-inch ground platform. We used a non-Foster matching circuit to match efficiently miniaturized MPAs on an FR-4 substrate. Experimental results show that the non-Foster matching circuit significantly improves such elements of antenna performance as return loss and antenna gain. In addition, we confirmed that the mutual coupling of the proposed CRPA array is less than -45 dB.

• Korean Journal of Social Welfare
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• v.62 no.1
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• pp.83-107
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• 2010

This study looked into the inner experience of foster mothers who adopted children under 3 months old and found out they were disabled while they were rearing with Van Manen's hermeneutic phenomenological approach. In-depth interviews were used with six foster mothers who live in Seoul, Gwangju, Gyeongsangnam-do, and Jeollabuk-do. The study resulted in a hermeneutic writing with titled "Love of Mothers Who Want to Make Their Children's Dreams Come True" with six essential themes as follows: 'being at a loss wrapped in a dense fog,' 'venting off the frustration,' 'gratitude amid painfulness,' 'bold confrontation with prejudices,' 'disabled children's return to the center of their moms' life,' and 'expectation for their future life.' As they are disabled, foster mothers want to rear their children with more care and attention to make their children's dreams come true. Seen above, this could be interpreted as mothers' love to a life. For foster mothers, the disability of their adopted children is not a burden but an expectation for a new world. They help the children live by themselves. It shows that every child can have his own home.

• Korean Journal of Social Welfare
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• v.69 no.3
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• pp.97-119
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• 2017

There has been no studies that compare services of residential care centers, group homes, and foster homes although out-of-home care services differ from each other depending on the types of out-of-home care. This study compared care satisfaction of 481 children in residential care centers, group homes, and foster homes for five years. Futhermore, factors that predict care satisfaction of the children were identified using multi-level modeling analyses. As results, this study found that care satisfaction of children in group homes was the higher than that in foster homes and residential care centers. In addition, self-esteem, social support, and types of out-of-home services were identified as significant predictors of changes in care satisfaction. Based on the study results, suggestions to help children adapt to out-of-home care and improve out-of-home care satisfaction were made.