• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.40 no.3
• /
• pp.243-250
• /
• 2012

In this paper, a systematic consequence of evaluation method, procedure, and flight data analysis is investigated for application of ADS-33E-PRF to UAV. And it is applied to unmanned rotorcraft for evaluation. CNUHELI-020, which is developed in Chungnam National University, is used for assessment of handling quality: decoupled longitudinal and lateral/directional model were used to assess handling qualities. Evaluation flight maneuvers are categorized as hover/low-speed requirements, small-amplitude attitude change, and moderate-amplitude attitude change requirements.

• Agribusiness and Information Management
• /
• v.3 no.1
• /
• pp.23-37
• /
• 2011

The development of informatization impacts all sectors, including agriculture. Agricultural informatization builds the knowledge linkage structures of agricultural innovation systems globally. This study investigated the global knowledge linkage structures in agricultural innovation pertinent to information technology (IT) for agricultural research and development (R&D) investments and activities. We explored the longitudinal trend of systemness within the networked research relationships in the triple helix (TH) of the university, industry and government (UIG). We collected data from publications in the Science Citation Index (SCI), the Social Sciences Citation Index (SSCI), and the Arts and Humanities Citation Index (A&HCI) to analyze the TH network dynamics. We also performed a scientometrics analysis to quantitatively identify the knowledge and insights of global agricultural innovation structures. These results could be informative for individual countries. Our findings reveal that the global knowledge linkage structures in the agricultural sector that are pertinent to IT fluctuate widely and fail to increase the capacity of agricultural innovation research due to a neglect of the network effects of the TH dynamics of UIG.

• Journal of the Korean Society for Library and Information Science
• /
• v.39 no.2
• /
• pp.147-160
• /
• 2005

This study examines trends of web query types and topics submitted to NAVER during one year period by analyzing query logs and click logs. There was a seasonal difference in the distribution of query types. Query type distribution was also different between weekdays and weekends, and between different days of the week. The log data show seasonal changes in terms of the topics of queries. Search topics seem to change between weekdays and weekends, and between different days of the week. However, there was little change in overall patterns of search behavior across one year. The implications for system designers and web content providers are discussed.

• Journal of Families and Better Life
• /
• v.33 no.4
• /
• pp.105-118
• /
• 2015

This study examined whether structural (coresidence, proximity) and associational (frequency of face-to-face contact, frequency of contact via phone, email or letter) solidarity between adult children and older parents may influence older parents' cognitive functioning. Adult children may help delay older parents' cognitive decline by promoting healthier lifestyle, engaging parents in complex everyday problem solving, and providing emotional support. The data consisted of men and women 65+ at Wave 1 who had at least one child 20+ and participated in at least two waves of the Korean Longitudinal Study of Ageing (KLoSA, N=3,961). Cognitive functioning was measured with the Korean version of the Mini Mental State Examination. Fixed effects models were estimated using the xtreg procedure in STATA. Findings suggest that increases in proximity with at least one adult child may lead to enhanced cognitive functioning among older parents. Neither transitioning to coresidence with at least one adult child nor increases in frequency of contact with at least one non-resident adult child was associated with changes in older parents' cognitive functioning. With older parents' increasing preference for living close by, but not necessarily living with adult children, greater proximity may provide more opportunities for reciprocal support exchanges between the two generations, leading to better cognitive functioning of older parents.

• Journal of Families and Better Life
• /
• v.33 no.4
• /
• pp.67-82
• /
• 2015

The study examined whether informal and formal social participations may mediate the association between widowhood and depressive symptoms, and whether gender may moderate the mediated associations. The data consisted of men and women 65+ who participated in the $3^{rd}$ wave of the Koran Longitudinal Study of Aging (KLoSA ; N = 4,146). Findings suggest that first, widowed older adults experienced significantly higer levels of depressive symptoms compared to their married counterparts. At the same time, the widowed individuals also reported more frequent contacts with family, friends, and neighbors (informal social participation), which contributed to narrowing the depression gap between widowed and married. Second, gender moderated the mediated association such that the mediating effect of informal social participation was significant only for older widowed women. Further, no mediating effect was found of formal social participation (participation in social, leisure, religious groups) for widowed and married regardless of gender. Previous studies indicated that social participation may be an important mediating factor that attenuates the effect of widowhood on depressive symptoms. Building on existing research, the present study highlighted theoretical rationales for potential gender differences in the way social participation may mediate the widowhood-depression linkage and evaluated statistically whether gender may moderate the mediated association.

• Journal of Family Resource Management and Policy Review
• /
• v.13 no.2
• /
• pp.43-64
• /
• 2009

The purpose of this study is to examine the effects of education expenditure children and financial support for parents on childbirth intention and, elderly life preparation. This study uses Korean Longitudinal Survey of Women & Families data. The research subjects are married women aged between $20{\sim}45$ years old who have one child and are living with at least one parent. The analysis method includes chi-square analysis, frequency analysis, and logistic regression analysis which is suitable for presuming differences between groups and relative influence or power. As a result, the first subjective perception is that economic conditions influence childbirth intention and elderly life preparation. Second, the portion of education expenditure is a more important factor than traditional ones, such as the child's sex, the married woman's job and her income. Third, elderly life preparation is influenced by economic factors, regardless of whether they are subjective or objective factors. Finally, analyses by logistic regression analysis suggest that a decision about childbirth is influenced by education expenditure. This refer to the costs related to the child's generation. A decision about elderly life preparation is related to financial support from parents, meaning costs related to the parents's generation.

• Human Ecology Research
• /
• v.53 no.5
• /
• pp.503-517
• /
• 2015

This study examined the relationships among children's perspectives on achievement-oriented parenting style, ego-resilience, school adjustment, and academic achievement. In order to analyze the associations, the study conducted a secondary analysis of the data found in the Korean Children and Youth Panel Survey (KCYPS) 2010-2011, which was a non-randomized controlled study designed with a longitudinal follow-up. We analyzed 1,212 students who were in the fourth and fifth grade at elementary school with Structural Equation Modeling (SEM). The results were as follows. First, higher achievement-oriented parenting style was associated with higher ego-resilience that contributed to higher academic achievement and higher school adjustment. Second, higher achievement-oriented parenting style was directly related to lower academic achievement and lower school adjustment. The findings support that children's ego-resilience is an important factor to improve school adjustment and academic achievement. In addition, the achievement-oriented parenting style is not helpful for their children's school outcomes (such as academic achievement and adjustment) even though parenting style improved their children's ego-resilience. Ego-resilience that is developed by achievement-oriented parenting style is likely to enhance children's school adjustment and academic achievement. The study presents policy and practice implications, limitations and areas for further research.

• International Journal of Human Ecology
• /
• v.15 no.2
• /
• pp.69-80
• /
• 2014

Guided by the exchange model, altruistic model, intergenerational solidarity theory, and cultural contexts, this study explored the determinants of financial intergenerational transfers between older parents and adult children in South Korea. We examined 18,820 parent-child dyads by using random-effects models on the first wave of the Korean Longitudinal Study of Ageing (KLoSA) data. Findings showed that downward financial intergenerational transfers were consistent with the self-interest exchange model but upward transfers did not support microeconomic theories. Family solidarity theory was generally supported by downward transfers but geographical proximity was not positively associated with upward transfers. Lastly, cultural contextual variables such as marital status, birth order, and sex of a child were found to be significant. Parents tended to both provide and receive more financial support from unmarried children than from married children. Within the same marital status, the hierarchy existed in order of the first-born son, the second or later sons, and daughters when it came to downward financial transfers. Regarding upward financial transfers, the preference in order was more complicated. The findings of this study help in understanding the intergenerational financial transfers in the Korean context.

• Phonetics and Speech Sciences
• /
• v.7 no.2
• /
• pp.63-73
• /
• 2015

This study investigated longitudinally early vocalization and phonological developments of typically developing children. Ten typically developing children participated in the study from 9 months to 18 months of age. Spontaneous utterance samples were collected at 9, 12, 15, 18 months of age and phonetically transcribed and analyzed. Utterance samples were classified into 5 levels using Stark Assessment of Early Vocal Development-Revised(SAEVD-R). The data analysis focused on 4 and 5 levels of vocalizations classified by SAEVD-R and word productions. The percentage of each vocalization level, vocalization length, syllable structures, and consonant inventory were obtained. The results showed that the percentages of level 4 and 5 vocalizations and word significantly increased with age and the production of syllable structures containing consonants significantly increased around 12 and 15 months of age. On average, the children produced 4 types of syllable structure and 5.4 consonants at 9 months and they produced 5 types of syllable structure and 9.8 consonants at 18 months. The phonological development patterns in this study were consistent with those analyzed from children's meaningful utterances in previous studies. The results support the perspective on the continuity between babbling and early speech. This study has clinical implications in early identification and speech-language intervention for young children with speech delays or at risk.

• The Bulletin of The Korean Astronomical Society
• /
• v.36 no.2
• /
• pp.128.2-128.2
• /
• 2011

Experiments to study high-energy cosmic rays (CRs) employ Monte Carlo codes for extensive air shower (EAS) simulations to figure out the properties of CRs. COSMOS and CORSIKA among EAS simulation codes are currently being used to analyze the data of the Telescope Array experiment. We have generated a library of about 10,000 simulated EASs with the primary energy ranging from $10^{18.5}eV$ to $10^{20}eV$ and the zenith angle of primary particles ranging from 0 to 45 degree for proton and iron primaries. We have compared the results predicted by CORSIKA and COSMOS under the same condition. In this talk, we show the differences in the energy spectra at the ground, the longitudinal shower profile as a function of atmospheric depth, the Calorimetric energy, and the Xmax distribution. We also discuss the lateral distribution function obtained from GEANT4 simulations which is being used to measure the detector response.