• Title/Summary/Keyword: Data Analysis

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Longitudinal Dynamic Relationships of Delinquent Peers and Delinquency Trajectories (비행또래집단과 청소년비행 간의 종단적인 역동적 관계)

  • Chung, Ick-Joong;Lee, Eun-Ju
    • Korean Journal of Social Welfare Studies
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    • v.41 no.1
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    • pp.119-144
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    • 2010
  • This study advances the knowledge of developmental patterns in affiliation with delinquent peers and delinquency during adolescence; data were obtained from waves 1-5 (2003-2007) of the Korea Youth Panel Survey. Semi-parametric group-based modeling (SGM) identified 3 affiliative trajectories of delinquent peers from age 13 to 16: rarely or never, persistently affiliative, and declining groups; and five developmental trajectories of delinquency: non-offending, late onset, low-level continuous, desisting, and chronic groups. A joint trajectory analysis predicted the membership of delinquency trajectories conditional on delinquent peer trajectories. Persistently affiliative group was more likely than others to follow chronic trajectory of delinquency; the rarely or never affiliative group was more likely to be non-offending. This study may help reconcile different theoretical models such as influence, selection, and enhancement models with respect to the role of delinquent peers in delinquency. The distinct theoretical models are equally valid, albeit each model pertains to a specific aspect of longitudinal patterns of affiliation with delinquent peers. Implications of this study for youth welfare were discussed to reduce increased risks for both affiliation with delinquent peers and delinquency.

A Study on the relationship among the sub-domains of Social Quality : socio-economic security and social cohesion (사회의 질 하위 영역간의 관계에 관한 연구 : 사회경제적 안전성과 사회적 응집성을 중심으로)

  • Jung, Hae-Sik;Ahn, Sang-Hoon
    • Korean Journal of Social Welfare Studies
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    • v.42 no.2
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    • pp.205-233
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    • 2011
  • This study aims to fathom the relationship between socio-economic security and social cohesion which are two sub-domains of Social Quality, on the institutional context of welfare state. In order to grasp the institutional context of welfare state, the study adopted welfare status theory and measured socio-economic resources of individuals via the status as welfare beneficiary and welfare taxpayer. The study postulates a theoretical model that the socio-economic security domain affects the social cohesion domain. In order to verity the theoretical hypothesis, this study utilized structural equations analysis(SEM) using social survey data conducted in year 2008. Recognition of social trust was included as the core index of social cohesion, and welfare statuses, socio-economic security and social trust were inserted in the sequence. Results revealed that the amount of resource in regards to welfare status of rights had significant influence on the socio-economic security, whereas it had no significant relations in regards to welfare status of duties. The recognition of socio-economic security derived from status of welfare rights and duties were positively associated with recognition of social trust. Also, the recognition of socio-eocnomic security turned out to have significant influence on social trust. Conclusively, among the two sub-domains of Social Quality, the study found that the socio-economic domain has influence on social cohesion domain. Such results suggest that in order to enhance the overall social cohesion in Korea, more delicate arrangement of welfare institutions are required.

Poverty Status Transition and Mental Health: The Effect of Mental Health on the Poverty Status Transition (빈곤지위의 변화에 정신건강이 미치는 영향 - 우울과 자아존중감의 영향을 중심으로 -)

  • Lee, Sang-Rok;Lee, Soon-A
    • Korean Journal of Social Welfare Studies
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    • v.41 no.4
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    • pp.277-311
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    • 2010
  • The powerful association between poverty and mental health has been recognized for many decades in the Western Countries. Despite growing poverty studies, there has been little attention to the association between poverty and mental health in Korea. In this article we examine the effects of the mental health on the poverty status transition. In this study we draw on nationally representative data from the The Korean Welfare Panel Study, to estimate the effects of depression and self-respects on the poverty status transition. Major findings are as follows. First, we find that there are mental health disparities between poor and non-poor classes. The mental health conditions of the poor are worse than the non-poor. Second, we find the strong correlations between the mental health and poverty status transition. Whether poor family exits poverty or not depends on the household head's mental health. Third, poverty experiences are different depending on the mental health conditions. To the mental ill-health family, the probabilities of poverty-exit are much lower and poverty duration is more long. Fourth, we find that family poverty status transitions are very significantly related with household head's mental health from the logistic model analysis. These findings suggest that there is a strong relationship between poor mental health and the experience of poverty in Korea. They also suggest that intervention programs to enhance the mental health of the poor are needed in order to reduce the poverty problem in Korea.

Gender, A Neglected Variable: An Analysis of a Gender Gap in Voter Turnout (여성, 간과된 변수: 투표율에서의 성차(Gender Gap) 분석)

  • Koo, Bon Sang
    • Korean Journal of Legislative Studies
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    • v.27 no.1
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    • pp.5-40
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    • 2021
  • This study attempts to analyze gender gaps in voter turnout for three different types of elections held since 2017 at the aggregate level using the Central Election Management Commission's turnout data, paying attention to the importance of women's voting. The findings are as follows. First, modern gender gaps in voter turnout at the aggregate level are confirmed in most regions regardless of election types. Second, the gender gap in turnout varies with age. The gender difference is verified in the "widowhood effect," where turnout decreases in the oldest-old. In the new voter group, modern gender gaps appear in most regions. The reversed gender difference in turnout in the late 20s, which reflects the Korean society's characteristics, is confirmed in all elections. Third, it is unclear whether the reverse gender gap in turnout becomes more pronounced in urbanized districts. As urbanization progressed, modern gender differences in voter turnout across age groups are observed at the population-based size level. Paradoxically, the modern gender gap tends to be weak and turns into the traditional gender gap in younger age groups (in the late thirties) in Gangnam-gu and Seocho-gu, the most modernized districts in Seoul. These results show that the modern gender gap in turnout is now a common phenomenon and continues to be strengthened by newly recruited voters in Korea. Thus we should pay more attention to female voters' political behavior and a new approach beyond the developmental theory to understand the causal mechanism to generate the modern gender gap in voter turnout.

Comparative analysis of deep learning performance for Python and C# using Keras (Keras를 이용한 Python과 C#의 딥러닝 성능 비교 분석)

  • Lee, Sung-jin;Moon, Sang-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2022.10a
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    • pp.360-363
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    • 2022
  • According to the 2018 Kaggle ML & DS Survey, among the proportions of frameworks for machine learning and data science, TensorFlow and Keras each account for 41.82%. It was found to be 34.09%, and in the case of development programming, it is confirmed that about 82% use Python. A significant number of machine learning and deep learning structures utilize the Keras framework and Python, but in the case of Python, distribution and execution are limited to the Python script environment due to the script language, so it is judged that it is difficult to operate in various environments. This paper implemented a machine learning and deep learning system using C# and Keras running in Visual Studio 2019. Using the Mnist dataset, 100 tests were performed in Python 3.8,2 and C# .NET 5.0 environments, and the minimum time for Python was 1.86 seconds, the maximum time was 2.38 seconds, and the average time was 1.98 seconds. Time 1.78 seconds, maximum time 2.11 seconds, average time 1.85 seconds, total time 37.02 seconds. As a result of the experiment, the performance of C# improved by about 6% compared to Python, and it is expected that the utilization will be high because executable files can be extracted.

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The Holocene tidal sedimentary changes in Mosan Bay Estuary, Korea (홀로세 충남 모산만 하구역내 간석지의 퇴적과정)

  • Shin, Young Ho
    • Journal of The Geomorphological Association of Korea
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    • v.18 no.3
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    • pp.37-51
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    • 2011
  • Geomorphic changes and sedimentary changes are investigated by sediment analysis from estuarine tidal flat, Mosan Bay Estuary, which is a tide-dominated and rias estuary. Sediments separatedly deposited during the early Holocene and the late Holocene. There are unconformities between the early Holocene sediment unit and the late Holocene sediment unit. Developments of these unconformities were related with fluctuated sea level change during the mid Holocene. Three deposit zones are spatially classified, which are named "intermittent tide channel deposit zone"(A1, B1, D3), "flood-dominated deposit zone"(A3, B3, C1, C3), and "fluvial sediment deposit zone"(A2, B2). This classification is explained by three main effects; laterally restricted migration of a tidal channel, diffract flood effect and settling lag effect, and fluvial induced reworking. These effects are deserved as main factors which have formed estuarine geomorphology in tidedominated and rias estuary. This study suggests research directions in reconstructing estuarine geomorphic and sedimentary change in west coast of Korea. Furthermore, it gives useful data for making a "land-ocean interaction" model for west coast of Korea.

Interactive Effects of Driving Confidence and Sensation-Seeking on Driving Anger: Focused on Driver's Age-Related Difference (운전분노에 대한 운전확신과 감각추구 성향의 상호작용 효과: 운전자의 연령대별 비교)

  • Jaesik Lee
    • Korean Journal of Culture and Social Issue
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    • v.18 no.3
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    • pp.389-413
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    • 2012
  • This study investigated the differential interactive effects of the combination of driving confidence and sensation-seeking on driving anger among different age groups, by using correlation analysis, a hierarchical regression and ANOVAs for the data gathered through the questionnaires administrated in a form of face-to-face interview. The results showed the followings. First, males tended to show higher level in driving anger than females. Second, whereas sensation-seeking was positively correlated with driving anger, age and driving experience were negatively correlated with driving anger, respectively. Third, although there was no significant relationship between driving confidence and driving anger among the drivers aged under 40 years, the drivers aged over 40 years showed higher level of driving anger as their driving confidence increased. Forth, level of sensation-seeking was found to be a strong predictor of driving anger in all age groups. Fifth, driving confidence and sensation-seeking appeared to affect the level of driving anger interactively among drivers aged under 40 years or over 65 years, resulting in higher driving anger only when both the levels of driving confidence and sensation-seeking were high. In contrast, driving confidence and sensation-seeking affected driving anger independently among the drivers aged 30-49 years. Implication and suggestion were discussed.

The Relationship between Perceived Transgression Wrongness and Forgiveness when Receiving Apologies: Moderating Effects of Self-Esteem (가해자가 사과했을 때 지각된 가해자 잘못과 용서의 관계: 자존감의 조절효과)

  • Sung Chan Ghim;Sung Moon Lim
    • Korean Journal of Culture and Social Issue
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    • v.21 no.1
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    • pp.97-118
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    • 2015
  • The aim of the present study was to examine moderating effects of self-esteem on perceived transgression wrongness and forgiveness defined as Worthington and Scherer's (2004) emotional forgiveness and decisional forgiveness when receiving apologies. Data collected from 861(486 males, 375 females) Korean college students were analyzed with hierarchical multiple regression analysis. The results were as follows. First, on emotional forgiveness, the two-way interaction effect of perceived transgression wrongness and explicit self-esteem was significant. And on decisional forgiveness, the two-way interaction effect of perceived transgression wrongness and explicit self-esteem was significant. The effect of perceived transgression wrongness on emotional and decisional forgiveness for individuals with high explicit self-esteem is stronger than its impact for individuals with low self-esteem. These findings show that explicit self-esteem may play an important role in forgiveness in college students through interactions with perceived transgression wrongness. Second, on emotional forgiveness, the three-way interaction effect of perceived transgression wrongness, explicit self-esteem, and implicit self-esteem was significant. The effect of perceived transgression wrongness on emotional forgiveness for individuals with high explicit self-esteem having high implicit self-esteem is stronger than its impact for individuals with low explicit self-esteem having high implicit self-esteem. These findings show that discrepancies between implicit and explicit self-esteem are detrimental to emotional forgiveness. But, on decisional forgiveness, the three-way interaction effect of perceived transgression wrongness, explicit self-esteem, and implicit self-esteem was not significant. Implications and limitations of this study were discussed.

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Customer Intangible Value in a Social Network (사회적 네트워크에서의 고객무형가치에 대한 연구)

  • Han, Sangman;Lee, Jieun
    • Asia Marketing Journal
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    • v.10 no.4
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    • pp.99-121
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    • 2009
  • Social networks can be a powerful force in marketing because they provide new ways to market to young generation. Though many studies on evaluation of customer lifetime value have been conducted, it is not clear how to assess the value of members within social networks. The purpose of this study is to evaluate members based on customer intangible value as well as customer lifetime value. Customer network value in terms of the power and influence within a network is analyzed through network structure analysis. Using Cyworld log file data, this study have shown that high percentage of members are very influential in terms of spreading or withholding information even though their CLV is low. It is expected that the findings of this research contribute to understand the interactive behaviors of members within networks and to provide valuable implications on new product launching and customer management strategies to marketers.

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A Study on Estimating CO2 Emission of Port in Korea (국내 항만장비의 온실가스 배출량 산정 및 추정 연구)

  • 김보경;박민정;안승현
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2023.05a
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    • pp.110-111
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    • 2023
  • As carbon neutrality has recently emerged as a global issue, the carbon neutral roadmap of MOF has been established and various strategies have been proposed to achieve carbon neutrality in the entire marine industry. The port sector is also included in the target for greenhouse gas reduction, but emissions are not being measured due to limitations in data collection and no inventory construction. For building a carbon-neutral port, it is essential to calculate and forecast emissions and set reduction targets. Accordingly, in this study, CO2 emitted from domestic port equipment was calculated according to the IPCC Guildeline's emission calculation method, and future emission was estimated. As a result of the analysis, about 420,000 tons of CO2 was emitted based on the cargo volume in 2020, and emissions are expected to continue to increase in proportion to the increase and about 720,000 tons will be emitted by 2050. In order to achieve carbon neutrality of the port, it needs to promote emission reduction by converting the power source for oil-based equipment to eco-friendly fuel. Also container and miscellaneous ports which require complicated cargo handling need to effort to reduce CO2.

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